Attachment_3_Drawings_and_Document_SPS2-145_Instruction_Manual(40kA).pdf

Instructions Installation Adjustment Maintenance

Type SPS2-123/145/170kV-40kA or below SF Gas Circuit Breaker Spring Operating Mechanism

PB 3668-04

For Emergency Service Call: 800-347-6659

(International: 1-919-365-2200)

T & D Equipment Services:

Installation & Commissioning Replacement Parts & Technical Support

Assessment & Equipment Testing Preventive Maintenance & Emergency Repair

For Emergency Service Call: 800-347-6659

(International: 1-919-365-2200)

T & D Equipment Services:

Installation & Commissioning Replacement Parts & Technical Support

Assessment & Equipment Testing Preventive Maintenance & Emergency Repair

Contents

The information contained herein is general in nature and not intended for specific application purposes. It does not relieve the user of responsibility to use sound practices in application, installation, operation, and maintenance of the equipment purchased. Siemens reserves the right to make changes in the specifications shown herein or to make improvements at any time without notice or obligations. Should a conflict arise between the general information contained in this publication and the contents of drawings or supplementary material, or both, the latter shall take precedence.

Important

Table of Contents

Introduction About Qualified Person

Installation and Maintenance Alerts Pre-Operational Checks Maintenance Maintenance Closing Device Current Transformers

Description Circuit Breaker Overview Supporting Legs FA1 and FA2 Mechanisms Operating Linkage Bushings SF6 Puffer Interrupter Current Transformers Density Switch Rupture Disk Ground Pads Lifting Lugs Characteristics of Sulfur Hexafluoride

Receiving / Handling / Storing Receiving Handling Storing

Installation General Tools and Service Equipment Installation Location Placement Grounding Connections Control Wiring Connecting Current Transformers Filling De-Energized Breaker with SF6 Gas Checking FA1/FA2 Mechanism Inspection Timing Test (Optional) Contact Resistance Line Connections Bushings Final Installation, Connections, and Inspection Summary

Page Principles of Operation

Closing Opening Spring Mechanism Opening Spring Operating Shaft Assemblies Interrupter Assemblies Interrupter Operation

Inspection Inspection General Periodic Inspection Timing Tests Pole Unit Inspection Periodic Inspection Check List Pole Unit Inspection Check List

Maintenance / Part Replacement General Ordering Replacement Parts Maintenance Tools, Materials, and Equipment Recommended Spare Parts List

Maintenance / Adjustment / Lubrication Opening Pole Units Rupture Disk / Desiccant Bag Replacement Removing Bushings Removing Stationary Contact Inspecting Stationary Contact Inspecting Moving Contact Removing Moving Contact Removing Moving Contact Support Assembling Moving Contact Support Assembling Moving Contact Assembling Stationary Contact Bushing Installation Filling De-Energized Breaker with SF6 Gas Leak Checking

Page

Contents

Figure 1 General Outline of Std. Circuit Breaker ..34 Figure 2 General Outline of IPO Circuit Breaker ...35 Figure 3 Pole Unit Assembly Figure 4 Std. Control Cabinet Layout Figure 5 IPO Control Cabinet Layout Figure 6 IPO Operator Cabinet Layout Figure 7 Linkage Adjustment on Std. Breaker Figure 8 Linkage Adjustment on IPO Breaker Figure 9 Desiccant Bag and Rupture Disk Figure 10 Bleeding Instructions Figure 11 Temp Compensated Density Switch Figure 12 Temp Compensated Pressure Switch ...45

Figure 13 Pressure Check Tool Figure 14 Typical SF6 Gas Properties Figure 15 Transducer Mounting on Std. Breaker ... 48 Figure 16 Transducer Mounting on IPO Breaker ... 49 Figure 17 Travel Record - Opening Figure 18 Travel Record - Closing Figure 19 Permissible Number of Operations Figure 20 Interrupter Unit - Arc Quenching Figure 21 Bushing Removal and Installation Figure 22 Nozzle Inspection Gauge Figure 23 Lifting Std. and IPO Circuit Breakers

PagePage

Summary

Illustrations

Appendix

Safety Alerts Introduction Qualified Person Pre-Operational Checks Operating

Function of FA1/FA2 Mechanism Charging Closing Spring Closing Process Opening Process

Inspection / Maintenance / Part Replacement Inspection Functional Checks Maintenance Solenoid Installation and Replacement Motor Installation and Replacement

Relaying Type Current Transformer Field Testing Ratio Test Polarity Test with Oscilloscope Insulation Resistance

Page Page

Figure 1A Schematic of Mechanism Latching Figure 2A Charging of Closing Spring Figure 3A Open State / Closing Spring Charged ... 63 Figure 4A Uncoupling Charging Gear Figure 5A Release of Closing Latch Figure 6A Closing Figure 7A Overtravel of Lever during Closing Figure 8A Latched in Closed Position Figure 9A Latching of Charged Closing Spring Figure 10A Release of Opening Latch Figure 11A Schematic of Overall Mechanical

Function of Std. Circuit Breaker Figure 12A Motor Mounting on FA1 Mechanism Figure 13A Motor Mounting on FA2 Mechanism Figure 14A Trip and Close Solenoids Figure 15A Typical Wiring Diagram for Std. Circuit

Breaker Figure 16A Typical Auxiliary Switch Figure 17A Ratio Check Connections Figure 18A Polarity Check Connections

These instructions do not purport to cover all details or variations in equipment, nor to provide for every possible contingency to be met in connection with installation, operation or maintenance. Should information be desired or should particular problems arise which are not covered sufficiently for the purchaser's purposes, the matter should be referred to the local Siemens sales office.

The contents of this instruction manual should not become part of or modify any prior or existing agreement, commitment or relationship. The sales contract contains the entire obligation of Siemens. The warranty contained in the contract between the parties is the sole warranty of Siemens. Any statements contained herein do not create new warranties or modify the existing warranty.

Introduction

The SF6 circuit breaker is one of the most important units in electrical power systems. The protection, stability, and continuity of service of the entire system depend largely on the efficiency of its operation.

Designed for use on 123kV, 145kV, and 170kV systems, Siemens Type SPS2 circuit breakers protect electric uti l i ty systems by interrupting fault currents and switching line, load, and exciting currents.

Siemens outdoor circuit breakers are precision built devices designed to function efficiently under normal opera t ing cond i t ions . They are des igned and manufactured to operate within the IEEE C37 (ANSI) and IEC 60056 standards applicable to the breaker rating.

The instructions included in this manual are necessary for safe installation, maintenance, and operation, and to aid you in obtaining longer and more economical service from your Siemens circuit breaker. For proper installation and operation resulting in better service and lower maintenance costs, this information should be distributed to your operators and engineers.

Carefully following these instructions will reduce the likelihood of difficulties with the equipment. However, these instructions are not intended to cover all the details or variations that may be encountered during the installation, operation, and maintenance of this equipment.

Should additional information be desired, including replacement instruction manuals, contact your Siemens representative.

The successful field performance of the circuit breaker depends as much on p roper ins ta l la t ion and maintenance as it does on good design and careful manufacture. Refer to these sections before performing any installation or maintenance operations.

Dis t inc t ive s igna l words (DANGER, WARNING, CAUTION) are used in this instruction manual to indicate degrees of hazard that may be encountered by the user.

For the purpose of this manual and product labels these signal words are defined below:

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

Indicates a potent ia l ly hazardous situation which, if not avoided, could result in death or serious injury.

DANGER

WARNING

CAUTION

Hazardous voltage and mechanisms.

Death or serious injury due to electrical shock, burns and entanglement in moving parts or property damage will result if safety instructions are not followed.

Do not service or touch until you have de-energized high voltage, grounded all terminals and turned off control voltage. Grounding terminals with line to ground capacitors may produce a small arc.

Only qualified personnel should work on or around this equipment after becoming thoroughly familiar with all warnings, safety notices, instructions and maintenance procedures contained herein.

The successful and safe operation of this equipment is dependent upon proper handling, installation, operation and maintenance.

For the purpose of this manual, a qualified person is one who is familiar with the installation, construction and operation of the equipment, and the hazards involved. In addition, he or she has the following qualifications:

1. Is trained and authorized to energize, de-energize, clear, ground, and tag circuits and equipment in accordance with established safety practices.

2. Is trained in the proper care and use of protective equipment such as rubber gloves, hard hat, safety glasses or face shields, flash clothing, etc., in accordance with established safety practices.

3. Is trained in rendering first aid.

Qualified Person

About Indicates a potent ia l ly hazardous situation which, if not avoided, may result in minor or moderate injury.

No attempt to operate the circuit breaker should be made until all shipping braces and/or ties have been removed, the circuit breaker has been inspected and filled with the SF6 gas.

The wir ing and schemat ic connect ion d iagrams supplied with the circuit breaker should be used when testing and checking the operating mechanism and control circuits. Check all wiring for looseness.

A slow close device is available as a special tool. It is not required for normal maintenance, adjustment, or installation of a SPS2 circuit breaker. The device is required for disassembly of the FA1/FA2 spring mechanism. No mechanism adjustments require using this device.

Installation and Maintenance Alerts

Pre-Operational Checks When installing, adjusting, maintaining, inspecting or replacing parts of the circuit breaker, the following pre-operational checks should be performed for ease of operation and safety.

1. Read the instruction manual supplied with the circuit breaker.

2. Check for proper installation and/or alignment by following the INSTALLATION section.

3. Check for the proper maintenance procedures by fo l low ing the MAINTENANCE / PARTS REPLACEMENT section.

4. Do not operate the circuit breaker until the items listed above are completed and functioning properly.

Hazardous voltage and mechanisms.

Death or serious injury from electrical shock, burns, and entanglement in moving parts will result from misuse.

This equipment should be installed, operated and maintained only by qualified persons thoroughly familiar with equipment instruction manual and drawings.

Hazardous voltage and mechanisms.

Death or serious injury due to electrical shock, burns, and entanglement in moving parts or property damage will result if safety instructions are not followed.

1. Do not service or touch until you have de-energized high voltage, grounded all terminals, and turned off control voltage.

2. Do not open or close the circuit break unless it is clear of all moving parts.

3. Discharge the circuit breaker's energy storage system before per forming main tenance or inspection.

4. The circuit breaker and its mechanism must be disconnected from all electrical power before performing maintenance or inspection. Grounding leads should be properly attached and framework grounded.

5. Never operate the circuit breaker manually while it is energized or control power is connected.

6. Only qualified personnel should work on or around this equipment after becoming thoroughly familiar with all warnings, safety notices, instructions, and maintenance procedures contained herein.

The successful and safe operat ion of th is equipment is dependent upon proper handling, installation, operation, and maintenance.

Maintenance

Installation and Maintenance Alerts

Work on the circuit breaker should be performed only by qualified personnel. The circuit breaker should be in the open position with the energy storage system of the operating mechanism discharged. In addition, all e lectr ic power to the c i rcui t breaker should be disconnected, and the circuit breaker should be properly grounded.

Maintenance Closing Device

Hazardous voltage and mechanisms.

Death or serious injury from electrical shock, burns, and entanglement in moving parts will result from misuse.

Do not service or touch until you have de-energized high voltage, grounded all terminals and turned off control voltage. Grounding terminals with line to ground capacitors may produce a small arc.

Only qualified personnel should work on or around this equipment after becoming thoroughly familiar with all warnings, safety notices, instructions, and maintenance procedures contained herein.

The successful and safe operation of this equipment is dependent upon proper handling, installation, operation and maintenance.

Current Transformers

Hazardous voltage.

Death, serious injury, or damage to the circuit breaker will result.

Current transformers must not be operated with an open circuit and must be either connected to a burden or short circuited and grounded at the terminal blocks.

If a short circuit is to be made, the connection should be across the taps of the highest ratio, otherwise, dangerous voltages may occur across the open transformer secondary terminals.

This equipment should be installed, operated and maintained only by qualified persons thoroughly familiar with equipment instruction manual and drawings.

Description

The FA1 and FA2 mechanisms use spring energy to opera te the SPS2-145kV-40kA breaker . The mechanisms are electrically trip-free, and each unit is complete with its own motor for open-close-open operations.

General outlines of typical SPS2-145kV-40kA circuit breakers are shown in Figure 1 and Figure 2 in the ILLUSTRATIONS section.

There are mainly two operating types, standard and IPO (Independent Pole Operation), for the SPS2-145kV- 40kA circuit breaker. The standard type has one FA2 mechan ism opera t ing the th ree po le un i ts s imul taneous ly whereas the IPO type features independent po le opera t ion w i th th ree FA1 mechanisms, each mechanism operating each pole unit independently. It should be noted that the same pole unit, except for the corner gear housing, is shared by the standard and IPO types. However, the IPO type can be combined with the Siemens PSD for controlled switching operation. The PSD can be used for controlled closing (e.g. capacitor bank switching) and/or controlled opening (e.g. transformer switching). The time delay between pole units is programmable for a wide variety of points on wave switching.

Each circuit breaker consists of three pole units mounted on a structural frame, and each pole unit consists of two bushings mounted on a grounded metal housing which contains the interrupter. This interrupter unit is mechanically connected to the operat ing mechanism through a connect ing rod, operating shaft assembly, lever, and horizontal pull rod where applicable. The FA1/FA2 mechanism contains the opening and closing springs. Bushing type current transformers, when ordered, are mounted to each pole unit. The circuit breaker is filled with the SF6 gas to 5 psig at the factory to maintain a positive pressure before it is shipped out. During installation in the field, the SF6 gas is added to pressurize the circuit breaker at the required fill pressure. See the circuit breaker nameplate for the required fill pressure.

Circuit Breaker Overview

FA1 and FA2 Mechanisms

Supporting Legs To facilitate shipment, the circuit breaker was designed with a low profile. Four legs are shipped attached to the circuit breaker frame. During installation, raise the circuit breaker using the lifting lugs and install the legs to the proper height. See Figure 23 for lifting illustration.

Hazardous voltage and mechanisms.

Death or serious injury from electrical shock, burns, and entanglement in moving parts will occur from misuse.

Do not service or touch until you have de-energized high voltage, grounded all terminals, and turned off control voltage.

Only qualified personnel should work on or around this equipment after becoming thoroughly familiar with all warnings, safety notices, instructions, and maintenance procedures contained herein.

The successful and safe operation of this equipment is dependent upon proper handling, installation, operation, and maintenance.

The weatherproof control cabinet and operator cabinet (IPO only) have a large access doorway, sealed with gaskets, to provide easy access for inspection and maintenance. A heater provides continuous inside-outside temperature differential, with addit ional thermostatically controlled heaters for winter use when required. Included in the control cabinet and operator cabinet are necessary auxiliary switches, cut-off switch, alarm switch and operation counter. The control relays and control switches (one each for the control circuit, motor, and heater circuit) are also mounted inside the control cabinet. Terminal blocks inside the control cabinet and operator cabinet (IPO only) are provided for control and transformer wiring.

The FA1 and FA2 mechanisms provide minimum reclosing times of approximately four and one-half cycles.

Each interrupter unit consists of the stationary contact assembly and the moving contact assembly mounted inside the pole unit housing. Electrical connections to the bushings are made through plug-in connections which are part of the interrupter sub-assembly.

SF6 Puffer Interrupter

The bushings are insulated by the SF6 gas and are available in porcelain or composite materials.

Bushings

Current Transformers

Hazardous voltage.

Death, serious injury, or damage to the circuit breaker will result.

Current transformers must not be operated with an open circuit and must be either connected to a burden or short circuited and grounded at the terminal blocks.

If a short circuit is to be made, the connection should be across the taps of the highest ratio, otherwise, dangerous voltages may occur across the open transformer secondary terminals.

Current transformers can be mounted at the base of each bushing. They are usually of the multi-ratio type, having f ive leads to provide a range of rat ios.

Transformer leads are brought through conduits to the control cabinet where they are connected to terminal blocks. The current transformers are normally of the relaying accuracy class; however, metering accuracy transformers and linear couplers are available.

The components of the operating linkage contained in the control cabinet (or operator cabinet) and linkage cover are as follows:

1. An adjustable horizontal pull rod which connects the mechanism bellcrank lever to the first (Standard) or each (IPO) phase and operating lever assembly.

2. Non-adjustable links connect between phase A and B and phase B and C operating levers. (Standard only)

See Figure 7 and Figure 8 for an overview of the major components of the linkage assembly for the standard and IPO types respectively.

Operating Linkage

The circuit breaker is equipped with either:

1. A Bourdon tube-type pressure gauge, -14.5psi vacuum to 218psi [-100kPA to 1500kPa], mounted inside the control cabinet for monitoring the SF6 gas pressure of all three phases. This is commonly referred to as an internal density switch configuration. A pressure versus temperature table is required when verifying the pressure level.

or

2. A density switch with integral density gauge mounted on the circuit breaker frame for indicating the SF6 gas density. This is an external density switch configuration which may have one switch/gauge for monitoring all three phases collectively or three separate switches/ gauges for monitoring each phase independently.

The face of the density gauge is color-coded to identify various density levels including fill, alarm, and lockout se t t ings . Because the gauge is tempera tu re compensated, no pressure versus temperature table is required when verifying density levels. The density levels are quantified on the gauge in psi/kPa units at a reference temperature of 68oF (20oC).

Density Switch

Sulfur hexafluoride (SF6) in a pure state is inert and exhibits exceptional thermal stability. It has excellent arc quenching properties. These characteristics combined with its good insulating properties make it an excellent medium for use in circuit breakers and switchers.

Chemically, the SF6 gas is one of the most stable compounds, and in its pure state, it is inert, non-flammable, non-poisonous, and odorless. However, it displaces oxygen and can cause suffocation in a closed environment.

Thus, proper ventilation should be available whenever personnel are working with the SF6 gas. Also, there will be some breakdown of the SF6 gas after it has been exposed to an electric arc. Desiccant bags are used in the apparatus to remove most of the gaseous by-products and some of the gas-borne powders. These by-products are injurious and exposure to them should be avoided by maintenance personnel. The precautions to be followed in handling the gas are covered in detail in the MAINTENANCE / PART REPLACEMENT section.

Characteristics of Sulfur Hexafluoride

Oxygen deficiency could result in death or injury.

Make sure that proper ventilation is available when working with the SF6 gas.

WARNING

There is some depreciation of the gas properties after extended periods of arcing; however, such change is very slight and has a negligible effect upon the dielectric strength and arc interrupting ability. Furthermore, the solid arc products formed at arc temperatures are the metallic fluorides, which are good insulators under the conditions existing in the circuit breaker.

The SF6 gas is furnished in standard industrial type cylinders. The cylinders have special size (0.965" diameter - 14 threads/inch Nat. Std. left hand) pressure connections supplied for absolute safety. The adapter for connection to the cylinder is a CGA #590 bullet-shaped coupling nipple with 0.960 left hand, external male thread, 14 threads per inch. The gas is stored in the cylinders at approximately 300 psig pressure which is the vaporization pressure at 75oF.

Two or four NEMA standard ground pads are mounted on the circuit breaker frame, one on the left front and the other on the right rear or at the bottom rails facing down.

Each cabinet has one NEMA standard ground pad mounted on.

The dial on the density gauge does not actuate until the circuit breaker is filled with at least 40 psi at 68oF (20oC). Therefore, the circuit breakers with external deinsity switch(es) are also provided with a pressure check tool, part of the installation tool kit, for checking values below this point.

Ground Pads

A rupture disc is mounted in each pole. Should the pressure in the pole unit accidentally reach 154+/-8 psig, the disc would rupture exhausting the SF6 gas to atmosphere.

Rupture Disk

Three lifting lugs are bolted to the circuit breaker pole units. See Figure 23 for illustration.

Lifting Lugs

Receiving / Handling / Storing

All SPS2 c i rcu i t b reakers a re assembled and production tested at the factory, after which they are carefully inspected and prepared for shipment. Circuit breakers covered by this instruction manual are normally shipped completely assembled except for the four legs which are removed to facilitate shipment.

Each circuit breaker is shipped from the factory with the SF6 gas at approximately 5 psig to insure a dry atmosphere during transit in order to protect the insulation.

Upon receipt of a circuit breaker, it should be examined for any damage sustained in transit. Damage should be reported immediately to the carrier and the nearest Siemens sales office.

Check all parts against the shipping list as they are unpacked and identified. A complete drawing package is provided in a weather resistant envelope inside the control cabinet for the customer's use. Search the packing material carefully for bolts, nuts, and other hardware which may have loosened in t rans i t .

Instruction manuals, cards, or leaflets shipped with the circuit breaker should be kept with the equipment.

WARNING

Do not p lace the c i rcu i t breaker whi thout legs assembled on soft ground. Temporary matting boards are recommended to prevent damage to the equipment.

Pressur ized po le un i t hous ings and heavy equipment.

Death, serious injury, or damage to the equipment during handling could result.

Do not strike, shock, or strain the porcelain housings or in any way cause the porcelains to rupture.

Do not move the pole units if the SF6 gas pressure is above 10 psig.

When moving the circuit breaker, do not lash it down by the bushings or current transformers.

Receiving

The weight of the circuit breaker is listed on the nameplate. The circuit breaker must be lifted by hooking onto four lifting lugs on the frame. See Figure 23 for lifting instructions.

Handling

WARNING

Heavy equipment with a high center of mass.

Death, serious injury, or damage to the equipment could result.

Follow instructions above during handling to prevent the circuit breaker from tipping over and/or being suddenly dropped.

Even though the circuit breaker may not be placed into service immediately, installation in its permanent location is recommended. If this is not practicable, it should be stored in a place where it can be protected from mechanical damage. For outdoor storage, it is advisable to protect moisture absorbing materials (such as wood and cardboard) from water. The following precautions should be taken:

Each circuit breaker is shipped from the factory filled with the SF6 gas at approximately 5 psig to ensure a dry atmosphere during transit. This positive pressure must be maintained during storage. Pressure readings should be monitored and recorded monthly during storage. Circui t breakers with external densi ty monitor(s) are provided with a pressure check tool as part of the Installation Tool Kit for checking for the shipping pressure. If for some reason the shipping pressure is lost and leakage is suspected, the source of leakage should be located and repaired. The circuit breaker should be purged of moist atmosphere by changing the desiccant bags, and evacuating to approximately 2 millimeters of mercury. The SF6 gas should then be added to a pressure of 5 psig and maintained during storage.

All accessories, spare parts, and tools should be stored indoors and protected from dirt and moisture.

The operating mechanism and controls should be protected against corrosion. This is best accomplished by closing the cabinet doors and energizing the space heaters. This is recommended even if it requires the use of a temporary electrical circuit to the heaters.

Storing

General The Type SPS2 breaker has been completely as-sembled, tested, and inspected at the factory and re-quires a minimum of field checks during installation.

The installation checklist located at the end of this section is intended to provide a tabulation of those checks and tests necessary to effect a proper installa-tion. Actual measured values should be entered on the blank spaces rather than an indication that the values were within the prescribed tolerances as the installa-tion checklist is also intended to be used as a reference when inspection and maintenance is performed.

The following items are more difficult to procure and are provided by Siemens with each circuit breaker order:

1. Adapter fitting for SF6 filling.

2. Service hose for SF6 filling.

3. SF6 gas, if ordered.

4. Timer mounting bracket.

5. Manual charging wrench.

6. SF6 bleed cap assembly.

7. Pressure check tool.

(For external density switch configurations)

Tools and Service Equipment The following materials and equipment are required for the installation of the Type SPS2 circuit breaker and should be available before commencing work. These items are not supplied by Siemens.

1. Leak-tec for leak testing

2. Six (6) ton crane with a working height of 25 feet

3. Four (4) of nine (9) feet long hook chains (See Figure 23.)

4. Ten (10) feet "A" frame step ladder to work at the top of th circuite breake

5. Shim material - various thicknesses

6. Wrenches - standard metric sizes of open end or box type

7. 0 to 100 lb-ft and 0 to 400 lb-ft torque wrench and metric sockets

8. Thermometer accurate within 2oF

9. 1/4 inch blade screwdriver

10. Timing equipment and mounting hardware (See Page 11.)

11. Corrosive-resistant conductive joint compound and wire brush or steel wool

12. Ductor or equivalent 100 Amp DC source with micro-ohmmeter.

Installation Location The circuit breaker should be installed with sufficient space for cleaning, inspecting, and opening doors.

Refer to the outline drawing located in the pocket of the control cabinet door.

The foundation should be prepared before the circuit breaker arrives and should be level within 0.25" at the four stud locations. Use shims to level breaker when setting breaker on foundation. Consult the outline for necessary dimensions and foundation bolt locations.

The circuit breaker foundations should be high enough to prevent flood water from entering the control/operator cabinet.

Placement Place the circuit breaker on the permanent foundation.

The precautions described under the RECEIVING/ HANDLING/STORING section must be observed.

The circuit breaker must be lifted in order to attach the four legs. Once the legs are assembled, the whole assembly is to be bolted to the foundation. The leg bolts should be firm but not tight to allow proper alignment. Insert shims, if necessary, under the legs to level the circuit breaker before tightening the foundation bolts. The circuit breaker should be level so that moving parts within the breaker can operate freely;

otherwise, friction may develop and undue strains may be imposed which could result in breaker malfunction.

When the circuit breaker and legs are properly aligned and leveled, tighten all bolts securely to the torque value specified in Figure 1.

WARNING

Pressurized bushings.

Death, serious injury, or damage to the equipment during handling could result.

Do not strike, shock, or strain the porcelain housings or in any way cause the porcelains to rupture.

Do not move the circuit breaker if the SF6 gas pressure is above 10 psig.

Grounding Connections Two or four NEMA standard ground pads are located on the circuit breaker frame. The standard type has one pad on each side while the IPO type has four pads welded on the bottom rails facing down. One NEMA standard ground pad is located on the control/operator cabinet. A connection should be made from these pads to the station grounding network. The grounding conductor should be capable of carrying the maximum short circuit current for the duration of the fault. All joints must be clean, bright and free from burrs or surface roughness.

WARNING

Poor grounds.

Death or serious injury due to electrical shock could result.

The c i rcui t breaker must be connected to a permanent low resistance ground.

Avoid poor grounds because they can give a false feeling of security to those working on the circuit breaker.

Control Wiring All control wires to the circuit breaker should be in conduit where practical. A control wiring diagram is located in the pocket on the inside of the control cabinet door. The control wiring should be installed so that t roub le w i th any o ther equ ipment cannot be communicated to the control wiring of this circuit breaker.

The circuit breaker requires the full rated control voltage as specified on the nameplate in order to perform a close or trip operation.

The proper wire size should be selected to minimize the vol tage drop; otherwise, t r ipping t ime could be increased.

Connecting Current Transformers Bushing-type current transformers, supplied only when ordered, are mounted externally on the pole unit as shown in Figure 1 and Figure 2.

Circuit breakers with external density switch(es) are provided with a pressure check tool as part of the Installation Tool Kit, for checking for the shipping pressure. See Figure 13 for illustration.

If the gas pressure is reduced to 0 psig, it will be necessary to find and repair the cause of the leakage and then pull a vacuum to 2 mm of Hg before filling with the SF6 gas.

Before the circuit breaker is operated or placed into service, it must be filled with the SF6 gas to 87 psig at 68oF. For circui t breakers with intenal density swi tch(es) , take into considerat ion the ambient temperature. For those with external density switch(es), the gas pressure may be read directly from the gauge.

The SF6 gas can be supplied from a service unit or directly from a gas cylinder. If it is necessary to evacuate the circuit breaker, use of a service unit is recommended;

otherwise, it is more convenient to fill directly from a bottle. For circuit breakers with internal density switch(es), the fill valve is located inside the control cabinet. For those with external density switch(es), the fill valve is located below the gauge.

Equipment required to fill from a bottle are as follows:

1. SF6 pressure regulator (preferred) or the SF6 cylinder adapter supplied with the tool kit.

2. Hose supplied with the tool kit.

3. Adapter fitting supplied with the tool kit.

4. Wrenches: 3/4", 13/16", 7/8", 1-1/8", 1-1/4", 17mm, 32mm, 3/8" Hex Key (or 8" and 10" adjustable wrenches)

5. Thermometer fo r ambien t tempera tu re measurement . (For in terna l dens i ty swi tch configurations).

The circuit breaker requires approximately 58 lbs of the SF6 gas (i.e. 19.4 lbs per pole) to fill to the recommended operating pressure when starting from a vacuum. Since the circuit breaker is shipped with approximately 12 lbs of the SF6 gas (i.e. 4 lbs per pole), less gas is required to fill the partially filled unit.

The filling procedure is as follows:

1. Remove the cap from the SF6 cylinder fitting, and attach the SF6 pressure regulator or the special adapter.

Hazardous voltage.

Death, serious injury, or damage to the circuit breaker will result.

Current transformers must not be operated with an open circuit and must be either connected to a burden or short circuited and grounded at the terminal blocks.

If a short circuit is to be made, the connection should be across the taps of the highest ratio, otherwise, dangerous voltages may occur across the open transformer secondary terminals.

Current transformers are usually of the multi-ratio type with five leads to provide a wide range of ratios. These leads are brought into the control cabinet to terminal blocks. Each lead has an identification lettered on the terminal block marking strips. Refer to the table on the current transformer nameplate, which is mounted to the inside of the cabinet door, to determine the transformer taps required to obtain the desired ratio.

Care must be exercised so as not to confuse the polarity of the transformers. If there is any question as to the proper method of connection, refer to the polarity, ratio, and connect ion diagrams. These diagrams are supplied as part of the detail drawings for the order.

Filling De-Energized Circuit Breaker with SF6 Gas Each circuit breaker is shipped with the SF6 gas at a positive pressure of approximately 5 psig. Evacuation is not required before filling. Before filling with the SF6 gas, check the pressure gauge to confirm that the gas pressure has not been lost due to damage or leakage.

Checking FA1/FA2 Mechanism

2. Remove the cap from the circuit breaker fill valve fitting.

3. Attach and tighten a hose to regulator or adapter.

4. "Crack" the SF6 cylinder valve and the hose end quick connect fitting, and allow the SF6 gas to flow through the hose, thereby purging air from the hose.

5. Shut off cylinder valve and connect the hose to the fill valve.

6. Open SF6 cylinder valve slowly and fill to proper SF6 pressure.

7. After the proper pressure is obtained shut the cylinder valve. Disconnect the hose from the breaker fill valve fitting. Replace the cap on the breaker fill valve.

Refill and check for leaks if the gas pressure falls below the minimum pressure required.

The moisture content of the SF6 should be no higher than 300 ppm(v). If the pole units have not been opened and exposed to a humid atmosphere, it will not be necessary to check for moisture after filling from an SF6 bottle. If there is reason to suspect high moisture, do not use the rubber filling hose for checking. Use stainless steel tubing for this purpose.

Read carefully the operating mechanism instructions in the appendix for information on the operation and maintenance of the spring mechanism. Inspect all insulated wiring for damage.

Oxygen deficiency could result in death or injury.

Make sure that proper ventilation is available when working with the SF6 gas.

WARNING

Inspection The Type SPS2 circuit breaker has been assembled, tested, and inspected at the factory. However, to preclude any malfunction of the equipment due to shipping damage, it is recommended that a final check is made for loose hardware, wire connections, and locking devices.

Adherence to the procedures identified in the Final Installation, Connections, and Inspection Summary section to verify that the items checked are within the allowable tolerances will assure a proper installation.

This information can then be used as a base reference for future maintenance.

WARNING

Over pressurization of the pole units could result in death, serious injury, or burst disk fragmentation.

Closely monitor the fill pressure during the filling process to avoid over pressurizing the pole units.

Timing Test (Optional) To check the circuit breaker timing, a Doble type travel analyzer or slide wire/oscillograph may be used.

The travel analyzer transducer or slide wire may be mounted on the linkage cover (Standard) or the FA1 mechanism (IPO) as shown in Figure 15 and Figure 16.

Make a trip operation and measure the contact part time. If the contact part time exceeds 26.0 ms (i.e. 1.56 cycles), the difficulty may be due to excessive voltage drop in the d-c control cable to the breaker.

In some instances, breaking of the main contacts may be followed in one or more poles by intermittent touching of the arc ring and the stationary contact. On a travel analyzer trace or an oscillogram, this would appear as if the main contacts reclose, or "bounce", for a period of up to 3 ms following contact separation. This behavior is completely normal and not cause for concern.

Perform a close operation and measure contact make time. Contact make time should be 2.8 to 3.8 cycles (i.e.

47 to 63 ms).

Measure the contact resistance terminal to terminal with a ductor, or equivalent 100 amp d-c source. Record the contact resistance of each pole to provide a permanent base-line reference against which future measurements can be compared.

Establishing a base-line value is particularly important for contact resistance measurements. Small variations in the chemical makeup of the conductor alloy from one lot to another are inevitable, and these can result in appreciable differences in the pole unit resistance. In diagnosing impending problems, the change in contact resistance with time is far more significant than the absolute value of the resistance.

Maximum values for new contacts are 110 micro-ohms.

The bushings on the circuit breaker should be cleaned with alcohol or other approved solvent.

Contact Resistance

As with an open operation, arc rings touching the stationary contacts may result in premature, intermittent indication of contact make, up to 5 ms before actual contact make. Contact velocity during open and close operations is set at the factory and need not be checked or adjusted prior to installation.

If, however, you check contact velocity and find it out of limits, be sure the test equipment is functioning properly.

If possible, recheck the results with another test set. If the circuit breaker is still out of specification, consult the factory.

Perform an open-close-open operation. Measure the reclose time and the in-contact time. Unless specifically o rdered o therw ise , the rec lose t ime w i l l be approximately 10 cycles. If a special reclose time was ordered, an adjustable time-delay relay (79X) will be provided. Adjust this relay, if necessary, to obtain the desired reclose time.

In-contact time should be in between 20 ms and 40 ms.

If a substantially different time is measured, check the angular position of the auxiliary switch 52a contact in the trip circuit. This contact should be positioned in a horizontal plane with the circuit breaker in the open position. Refer to the appendix of this instruction manual for auxiliary switch adjustment instructions.

Bushings

Line Connections Line connections should have sufficient flexibility and support to limit the load on the bushings (384 lbs maximum). Conductor and connector must have adequate current carrying capacity to prevent heat transfer into the breaker insulator. All joints must be clean, bright and free from burrs or surface roughness, and assembled using "joint compound."

The contact faces of the terminal plates and connecting parts should be rubbed vigorously with a stainless steel brush, which should be used for copper or aluminum only, until bright metal shows and, in the case of aluminum, until they become slightly roughened.

Wipe the faces with a rag and apply a coating of corrosion resistant, conductive compound such as Alcoa No. 2 Electrical Joint Compound on both surfaces.

The terminal plates are made of aluminum. If copper connecting parts are used, insert copper/aluminum adapter plates. Firmly tighten the connecting bolts.

CAUTION

Improper operation may cause equipment damage.

Do not operate the circuit breaker until all tests and inspections are done.

(Left):

(Right):

(Control cabinet):

(Operator cabinet):

Station:

Bus or Line:

Installation Date:

1. Nameplate Data

1.1 Switcher Type:

Serial-SO:

1.2 Mechanism Type: FA1/FA2

Control Diagram:

Control Voltage:

2. General Condition of Breaker when Received:

3. Breaker bolted to its permanent foundation and shipping braces removed:

4. Grounding connections installed:

5. Control wiring installed:

Final Installation, Connections, and Inspection Summary

NOTE: The following checks are needed after the circuit breaker has been installed on its permanent foundation.

Rating: kV kA

Instruction Book: PB-3668

Instruction Book: PB-3668 (Appendix)

Motor and Heater Voltage:

7. Breaker Filled with SF6

7.1 Breakers with internal density switch(es)

7.2 Breakers with external density switch(es)

8. Spring Mechanism (See Appendix)

9. Breaker Inspection

9.1 Final check for loose hardware:

10. Timing Tests (Optional) at Normal Operating Voltage and SF6 fill pressure

10.1 Trip coil energized until contacts part (20ms-26ms)

Tolerance between phases 2ms maximum

10.2. Open velocity during 10m/s after contacts part

(4.3m/s-5.3m/s)

10.3 Close coil energized until contacts touch (47ms-63ms)

Tolerance between phases 3ms maximum

10.4 Close velocity during 10 m/s before contacts touch

(3.5m/s-5.0m/s)

10.5 Close-open in-contact time (20ms-40ms)

10.6 Reclose time (if required) trip coil energized

until contacts touch (Approximately 150ms including a 50ms time delay)

SF6 Pressure: psig

Ambient Temperature: oF

SF6 Pressure: psig

6. Current Transformer

6.1 Connections made:

Hazardous voltage.

Death, serious injury, or damage to the circuit breaker will result.

Current transformers must not be operated with an open circuit and must be either connected to a burden or short circuited and grounded at the terminal blocks.

If a short circuit is to be made, the connection should be across the taps of the highest ratio, otherwise, dangerous vol tages may occur across the open t ransformer secondary terminals.

Pole A Pole B Pole C (If applicable) (If applicable) m s m/s m s m/s m s m s

11. Contact resistance terminal to terminal measured with ductor or equivalent 100 amp d-c source 90 micro-ohms maximum for new contacts.

12. SF6 Pressure Switch Operation

12.1 Breakers with internal density switch(es)

The density switch operation can be checked by closing the shut-off valve and dropping the gas pressure with the bleed cap assembly found in the Installations Tool Kit. See Figure 10 for bleeding instructions. The density switch should be set to operate to follow the curve in Figure 14, within +2 psig. See Figure 12 for setting directions.

12.2 Breakers with external density switch(es)

The density switch operation can be checked by parting the quick disconnect fitting and dropping the gas pressure with the bleed cap assembly found in the Installations Tool Kit.

See Figure 10 for bleeding instructions.

13. Record Operation Counter Reading:

14. Record SF6 Gas Pressure and Temperature

14.1 Breakers with internal density monitor

14.2 Breakers with external density monitor

(Pole A): micro-ohms (Pole B): micro-ohms (Pole C): micro-ohms

Alarm switch #1 closes: psig oF

Lockout switch #2 closes: psig oF

Pole A Alarm switch #1 closes: psig (at 68oF ref)

Lockout switch #2 closes: psig (at 68oF ref)

Lockout switch #3 closes: psig (at 68oF ref)

Pole B (If applicable) Alarm switch #1 closes: psig (at 68oF ref)

Lockout switch #2 closes: psig (at 68oF ref)

Lockout switch #3 closes: psig (at 68oF ref)

Pole C (If applicable) Alarm switch #1 closes: psig (at 68oF ref)

Lockout switch #2 closes: psig (at 68oF ref)

Lockout switch #3 closes: psig (at 68oF ref)

SF6 Pressure: psig, Amb. Temp: oF

Pole A: psig (at 68oF ref)

Pole B (if applicable): psig (at 68oF ref)

Pole C (if applicable): psig (at 68oF ref)

15. Check all labels and nameplates attached to the circuit breaker to be sure that they are securely fastened in place and are readable.

CAUTION

A closed SF6 shut-off valve or parted quick disconnect fitting on an energized breaker could result in death, serious injury or substantial property damage.

Open shut-off valve or join quick disconnect fitting before energizing breaker. Do not close shut-off valve or part quick disconnect fitting while breaker is energized.

Principles of Operation

Improper operation may result in circuit breaker damage.

Do not operate the circuit breaker until all tests and inspections are completed.

CAUTION

To close the circuit breaker, a low energy electrical signal actuates a solenoid on the FA1/FA2 mechanism.

The energy stored in the mechanism closing spring charges the opening spring and moves the moving contacts to the closed position. Having reached the full closed position a mechanical latch in the mechanism is engaged to hold the circuit breaker in the closed position.

The interrupter consists of two separate assemblies, a moving contact assembly and a stationary contact assembly. The moving contact is attached to the end housing assembly casting with a bolted flange joint.

The stationary contact is attached to the end plate casting with a glued joint. Each assembly contains a flange, an insulating support tube, and a contact carrier to which the contacts are assembled. Both contact carriers contain plug in contacts for the bushing leads.

There is no insulating tube enclosing the stationary and moving contact assemblies.

Refer to Figure 3 for illustration.

The mechanism is connected by a separate linkage to the auxiliary switch. A position indicator, visible from the bottom of the base assembly, is connected to the horizontal linkage and indicates whether the circuit breaker is in the open or closed position.

Operating Shaft Assemblies At each pole unit, a link is connected by a lever to a shaft which penetrates the pole unit corner gear housing.

The linear motion of the link is converted to a rotary motion of the shaft. Inside the corner gear housing, the shaft is connected to another lever and linkage which change the rotary motion of the shaft to a linear motion of the moving contact. A sealing arrangement between the shaft and the housing prevents leakage of the SF6 gas from the pole units.

Opening Spring

Energy for opening is stored in the opening spring located inside the mechanism. When the circuit breaker is tripped, the spring transmits its energy through the linkage to the lever at each pole unit. The levers transfer the motion to the moving contact assemblies.

As the circuit breaker opens, the contacts separate and an electric arc is formed in the chambers between the moving and s ta t ionary contacts . The in terna l construct ion of the interrupter assures ef f ic ient extinction of the arc with the SF6 gas. Since the interrupter performance is velocity dependent, the opening spring controls the moving contact velocity throughout the opening stroke.

The FA1/FA2 spring mechanism is used to operate the Type SPS2-145kV-40kA circuit breaker. Details of the operation of the mechanism are contained in the appendix of this instruction manual. An electric motor in the operating mechanism is used to compress a large spring. When compressed, the spring stores sufficient energy to close the circuit breaker and charge the opening spring. The mechanism spring force is transmitted through a crank and cam arrangement to an output crank. This crank is coupled by an adjustable pullrod to a transition lever which operates the levers on each phase.

The opening spring is located in the mechanism. This spring provides the energy to open the circuit breaker at the proper velocity and within the proper contact part time. When the circuit breaker closes, the spring is compressed and is in position for the next open operation.

Closing

Opening

Spring Mechanism

Interrupter Assemblies

Principles of Operation

Various positions of the interrupter unit as it moves from the closed position to the open position are illustrated in Figure 20.

With the interrupter in the closed position, the main current path is through the continuous current fingers which are parallel to the arcing contacts.