SOW_New_Circuit_Breaker.pdf

Item No 1 -SR No 0302461 – Design Auxiliary Power Circuit Breaker Upgrade

ABSTRACT

Contractor to supply services of a Naval Architect or Electrical Engineer to design the upgrade of the one (1) Auxiliary Power Circuit Breakers from the present original Whipp

& Bourne to a new design such Cutler Hammer or equivalent manufactured circuit breaker. Design to be submitted to ABS and USCG - MSC for approval.

LOCATION AND DESCRIPTION

Location:

Main Switchboard in EOS- Auxiliary Power Circuit Breakers

Circuit Breaker = 2 SENCB/Engine Room

Non-Vital GP Cont Cent

P405, P406, P408, P449

Description:

Design to include but not be limited to the following:

1) ABS requirements of new switchgear supporting Auxiliary Power Circuit Breakers (2)

– submit for approval

2) USCG requirements of new switchgear supporting Auxiliary Power Circuit Breakers

– submit for approval

3) Bottom mounting of new circuit breaker to allow drawing breaker in and out of service

4) 3 position mounting for Connection - Testing - Disconnection

5) Positioning and wiring of controls to allow synchronized 3 position operation

6) Modification to switchboard front panel to allow visual and operation of the new circuit breakers

7) Modification to the bus bars to allow proper connection between new circuit breaker and bus bars. Old connections to be removed or modified to receive new breakers.

Actual bus bar modification to be done in the field by the installing contractor

8) Specifications: 450VAC, 1600-2000 amps, 3 pole, 60 Hz, Fault Rating 9.6, Draw out type Air Circuit Breaker with 3 position (Connect-Test-Disconnect). Refer to Whipp &

Bourne 2015 overhaul report for design criteria and present operating conditions.\

9) Withdrawable breaker with rating:

• 600 Volt, 1600 Amp with 85 KA interrupting capacity

• 120 VAC, 60 HZ Motor charging mechanism + manual charging

• 120 VAC Undervoltage trip coil

• 120 VAC Closing coil

• 120 VAC Shunt trip coil

• Auxiliary contacts

• Electronic trip protection for Long Time + Short Time + Instantaneous

• Breaker housing.

10) – New Circuit Breaker Design- Cutler Hammer

Circuit breaker: MDS8203WEA201CANAA6ENNLPX

Cassette: MN203UABNNNNNWB

REFERENCE MATERIALS

Switchboard drawings

Whipp & Bourne Circuit Breaker Overhaul Report 2015

USCG – MSC 2015 format for plans submittal

STATEMENT OF WORK

Contractor to supply all labor, material and transportation necessary to design and submit to USCG and ABS for approval upgrade to one (1) Auxiliary Power Circuit

Breaker

Contractor to supply services of a naval architect or electrical engineer to design the upgrade of the one (1) Emergency Power Circuit Breakers from the originally installed

Whipp & Bourne design to new Cutler Hammer or equivalent. Completed design to be submitted in correct format to the USCG – MSC and ABS for review and approval.

Contractor’s upgrade to have new circuit breakers that are designed, constructed and tested to IEC Publication 60947-2 and meet all the qualifications as noted in most recent ABS rules and regulations

5.3 Construction, Assembly and Components

5.3.1 Enclosures

Enclosures and assemblies are to be constructed of steel or other suitable incombustible, moisture resistant materials and reinforced as necessary to withstand the mechanical, electro-magnetic and thermal stresses which may be encountered under both normal and short-circuit fault conditions.

Enclosures are to be of the closed type. The degree of the protection is to be in accordance with 4-8-3/Table 2.

All wearing parts are to be accessible for inspection and be readily renewable.

5.3.2 Bus Bars

5.3.2(a) General. Bus bars are to be copper; bus bars of other materials will require special consideration. Bus bars are to be sized and arranged such that the temperature rise will not affect the normal operation of electrical devices mounted in the switchboard. The design maximum ambient temperature is to be in accordance with 4-8-3/1.17.

5.3.2(b) Bracing of bus bars. Bus bars and circuit breakers are to be mounted, braced and located so as to withstand thermal effects and magnetic forces resulting from the maximum prospective short-circuit current.

5.3.2(c) Bolted connections. Bolted bus bar connections are to be suitably treated (e.g., silver plating) to avoid deterioration of electrical conductivity over time. Nuts are to be fitted with means to prevent loosening.

5.3.2(d) Cable connections. Soldered connections are not to be used for connecting or terminating any cable of 2.5 mm2 or greater. These connections are to be made by the use of crimp lugs or equivalent.

5.3.2(e) Clearance and creepage. Minimum clearances and creepage distances between live parts of different potential, i.e., between phases and between phase and the ground, are to be in accordance with the following table.

Rated Insulation Voltage Un (V)

Minimum Clearance

(mm)

Minimum Creepage

Distance (mm) Un 250 15 20

251 Un 660 20 30

660 Un 1000 25 35

5.3.2(f) Alternative (2014). Alternatively, reduced creepage and clearance distances may be used provided:

i) The equipment is not installed in ‘Machinery Spaces of Category A’ or in areas affected by a Local Fixed Pressure Water-spraying or Local Water-mist Fire Extinguishing System.

ii) The minimum clearance distance shall not be less than 8 mm

iii) The minimum creepage distance shall not be less than 16 mm.

iv) The equipment complies with IEC 61439-1.

v) In applying IEC 61439-1, the equipment is considered to be:

" Of overvoltage Category III, " Installed in an environment of pollution degree 3, " Having insulating material of type IIIa, and " Installed in inhomogeneous field conditions

vi) The temperature dependent criteria in IEC 61439-1 are derated to meet the ambient temperatures found on marine installations. Refer to 4-1-1/Table 8.

vii) The equipment is subject to an impulse voltage test with test voltage values shown in the Table below. Where intermediate values of rated operational voltage are used, the next higher rated impulse withstand test voltage is to be used. The impulse voltage test reports are to be submitted to ABS for review.

Rated Operational Voltage

V

Rated Impulse Withstand Test Voltage kV

50 0.8 100 1.5 150 2.5 300 4

600 6 1000 8

5.3.3 Circuit Breakers

5.3.3(a) Compliance with a standard. Circuit breakers are to be designed, constructed and tested to IEC Publication 60947-2 or other recognized standard. The certificates of tests are to be submitted upon request by ABS.

5.3.3(b) Short-circuit capacity. Circuit breakers are to have sufficient breaking and making capacities, as specified in 4-8-2/9.3.

5.3.3(c) Removable mounting. Circuit breakers are to be mounted or arranged in such a manner that the breakers may be removed from the front of the switchboard without first de-energizing the bus bars to which the breakers connect. Draw-out or plug-in type circuit breakers are acceptable for this purpose. Alternatively, an isolation switch may be fitted upstream (line or supply side) of the breaker. Consideration will be given to arrangements where portions may be isolated to allow circuit breaker removal, provided that this will not interrupt services for propulsion and safety of the vessel.

5.3.4 Fuses

Fuses are to be designed, constructed and tested in accordance with IEC Publication 60269 or other recognized standard. The certificates of tests are to be submitted upon request from ABS.

The requirements of 4-8-3/5.3.3(b) and 4-8-3/5.3.3(c) are to be complied with. Where disconnecting means are fitted, they are to be on the line or supply side. Where voltage to earth or between poles does not exceed 50 V DC or 50 V AC rms, fuses may be provided without switches. All fuses, except for instrument and control circuits are to be mounted on or accessible from the front of switchboard

5.3.5 Disconnecting Device

The rating of the disconnecting devices is to be equal to or higher than the voltage and current ratings of connected load. The device is to have an indicator for its open or closed position.

5.3.6 Internal Wiring

5.3.6(a) Wires. Internal instrumentation and control wiring is to be of the stranded type and is to have flame-retarding insulation. They are to be in compliance with a recognized standard.

5.3.6(b) Protection. In general, internal instrumentation and control wiring is to be protected by fuse or circuit breaker with the following exception:

" Generator voltage regulator circuits;

" Generator circuit breaker tripping control circuits; and " Secondary circuit of current transformer.

These circuits, however, except that of the current transformer, may be fitted with short-circuit protection.

DELIVERABLES

Contractor to supply ABS approved drawings for the upgrade for the one (1) Emergency

Power Circuit Breakers – 2 hard copies to ship and Electronic Copies to both ship and

COR.

Contractor to forward ABS approved drawings to USCG- MSC for their review and comments

Contractor to supply USCG approved drawings and/or correspondence to ship and

COR in both hard copy and electronic form

Item No 2 – SR No 0302461 Replacement of Auxiliary Power Circuit Breaker

ABSTRACT

The One (1) Auxiliary Power Circuit Breakers are the original Whipp & Bourne design and are no longer reliable and are expensive to overhaul and maintain. Contractor to supply and install one (1) Circuit Breakers of newer design and adapt them to the switchboard to make them operable. Installation to be done using ABS approved drawings. Contractor must show proof of having installed similar circuit breakers on at least 3 each vessels of a similar size and electrical arrangement to qualify for this job.

REFERENCES

Ship’s library reference for Switchboard and present Circuit Breaker installation

Whipp & Bourne instruction books

Cutler-Hammer – New Circuit Breaker Design

Circuit breaker: MDS8203WEA201CANAA6ENNLPX

Cassette: MN203UABNNNNNWB

GOVERNMENT FURNISHED EQUIPMENT

ABS and USCG approval drawings and instructions in ship’s Library

LOCATION AND DESCRIPTION

Location:

Engine Operating Station (EOS) Switchboard in Engine Room- Auxiliary Power Supply

Description:

Contractor to supply one (1) each ABS-approved Circuit Breakers to renew the SSDG

Whipp & Bourne Circuit Breakers presently installed. Circuit Breakers to be of a design equal to or better than present breakers such as Cutler Hammer Circuit breaker:

MDS8203WEA201CANAA6ENNLPX Cassette: MN203UABNNNNNWB. Whipp and

Bourne Circuit Breakers will not be acceptable. Contractor to modify whatever is necessary to fit the new circuit breakers into the switchboard for new circuit breaker making whatever changes are necessary to the bus bars, mounting arrangement and protection cover on the switchboard. Contractor to assist as necessary the crew to test the breakers and then call for ABS and USCG to approve same.

Withdrawable breaker with rating:

• 600 Volt, 1600 Amp with 85 KA interrupting capacity

• 120 VAC, 60 HZ Motor charging mechanism + manual charging

• 120 VAC Undervoltage trip coil

• 120 VAC Closing coil

• 120 VAC Shunt Trip Coil

• Auxiliary contacts

• Electronic trip protection for Long Time + Short Time + Instantaneous

• Breaker housing.

STATEMENT OF WORK

Installation to be done while the ship is in dry dock during July – August timeframe when the ship can be blacked out long enough to finish the installation of the one (1)

Emergency Tie Breaker in the EOS (contract no DTMA9417P00017) and also remove the one (1) existing circuit breakers for the Auxiliary Power below the Tie Breaker and install new Contractor-supplied circuit breakers.

Due to the design of the Bus Bars, the ship will have to be blacked out for the 3-4 days it will take to do the installation of the breaker under this contract and the breaker being done by Custom Panel. Both breakers must be removed and modified to complete the work under this contract and under the Custom Panel job.

Awarded contractor must co-ordinate the work with the Awarded Contractor (Custom

Panel) who is installing the new Tie Breaker above the one (1) new circuit breaker.

Bus bar fabrication must be fitted to allow for the proper operation and fit up to the existing Bus bars that connect to the EOS switchgear and Auxiliary and Emergency power connections.

Contractor to fit up new circuit breakers to the same location as the existing circuit breakers and fabricate whatever necessary supports and isolation panels to adapt the new circuit breakers to that space. All necessary control wiring and power supplies to be connected to allow the circuit breaker to operate equal to or better than the existing circuit breakers.

Contractor is responsible for all labor, material, transportation and rigging to accomplish the purchase of new circuit breakers and installation of the new circuit breakers plus the removal of the existing Whipp & Bourne circuit breakers

Contractor is responsible for the purchase of one (1) Circuit Breaker compatible with the present design:

Whip & Bourne Nameplate Data:

Type ACB 1600/2000 HR

3P 500VAC 60Hz

Part No: 4284048-2

Serial No: AB00255

Other design features include the following:

• Front accessible circuit breaker to allow for maintenance

• Floor roll out circuit breaker

• UL listed

• Meet or exceed ANSI, IEEE, NEMA standards

• 3 position – Disconnect, Test, Connect

Contractor is responsible for removing all the Circuit Breaker presently installed and to crate and transport those designated to MARAD Warehouse.

Contractor is responsible for all aspects of the conversion from Whipp & Bourne circuit breaker to new Contractor-supplied Circuit Breakers including”

• Bus bar modifications

• Control wiring connections and modifications

• Circuit Breaker mounting and racking changes

• Front protection cover modification to allow new breaker access

Contractor must abide by the ABS approved drawings and requirements for the installation and commissioning

DELIVERABLES

Contractor to supply 3 each manufacturer’s instruction books with bill of materials for ordering spare parts

Contractor to supply warranty to include manufacturer’s warranty plus contractor’s warranty as it applies to their installation of the circuit breakers

ADDITIONAL WORK AND SUPPLEMENTARY

Contractor to submit a written Condition Found report (CFR) to the COTR for any additional work outside the contract. Approval for additional work must be approved by either the COTR ($5000 or less) or the Contracting Officer (over $5000)

Contractor to provide cost breakdowns as they relate to labor, material, subcontractors and travel costs, if applicable. Supplementary costs must be approved by COTR by written CFR, RFQ, Quotation and Delivery Order process.

Item No 3 – Supplementary Labor

20 hrs @ $______/hr = $__________________

Item No 4 – Supplementary Material

$10,000