ESR Quad Teststand Power Supply RFI with Options v1.1.pdf

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Magnet Measurement Magnet Power Supply Request for Information

EIC/ESR Quad Test Stand Power Supply Thomas Jefferson National Accelerator Facility Newport News VA February 2025

Technical Representative (TR), Nick Falls

Magnet Measurement Engineer, Joe Meyers

ESR Normal Conducting Magnet Lead, Sarin Philip

1.0 INTRODUCTION

This RFI contains specifications for two independent DC power supplies with different output power levels. Only one power supply is needed, with final

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Responses shall include ranges for an estimated cost and lead time for each power output level. Datasheets and a top level topology diagram of prior design(s) with similar performance characteristics are requested.

Included in this document are preliminary requirements, subject to change, refinement, and further detail. The current need is an adjustable, unipolar, DC current source regulating within 10 parts per million (ppm) of full scale output, to be used for energizing various electromagnets during magnetic field characterization.

2.0 PERFORMANCE SPECIFICATIONS WITH OPTIONS

Characteristics common to both supplies

Parameter Minimum Nominal Maximum Units

Input AC voltage, 3 phase line-to-line

430 480 525 Volts AC rms

Input AC voltage line imbalance

-5 0 +5 % of nominal line-to-line

Input AC line frequency 57 60 63 Hz

Power supply maximum height

N/A 88 N/A inches

Power supply maximum depth (front to back)

N/A 42 N/A inches

Ambient temperature 15 27 35 Celsius

Ambient Humidity 10 60 95 %, non-condensing

Cooling water 32 35 38 Celsius

Table 1. Shared power supply input and environmental parameters Characteristics specific to each supply

Parameter Minimum Nominal Maximum Units

Output load resistance in pure resistive mode

0.03 0.07 0.15 Ohms, +/- 10%

Output magnet load resistance steady state

0.01 0.05 0.1 Ohms, +/-10 %

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Commented [NF1]: how is "pure resistive" different than "load resistance" if in steady state? And what's the significant of specifying "steady state" after load inductance?

Commented [NF2]: stability without loop adjustment

Commented [NF3]: single coil test - 0.01

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Output magnet load inductance steady state

5 9 15 millihenry, +/-10%

Output continuous operating current

10 450 600 Amps

Output continuous operating voltage

0.5 40 65 Volts

Power supply maximum width

N/A 48 N/A inches

Rated Output Voltage N/A 65 N/A Volts

Rated Output Current N/A 600 N/A Amps

Table 2A. 39 kW power supply output parameters

Parameter Minimum Nominal Maximum Units

Output load resistance in pure resistive mode

0.03 0.1 0.15 Ohms, +/- 10%

Output magnet load resistance steady state

0.01 0.05 0.15 Ohms, +/-10 %

Output magnet load inductance steady state

0.5 9 15 millihenry, +/-10%

Output continuous operating current

10 450 830 Amps

Output continuous operating voltage

0.5 40 90 Volts

Power supply maximum height

N/A 88 N/A inches

Power supply maximum width

N/A 48 N/A inches

Rated Output Voltage N/A 90 N/A Volts

Rated Output Current N/A 830 N/A Amps

Table 2B. 75 kW power supply output parameters

2.1 The output current shall have a total Envelope of Uncertainty of less than 10 ppm, referenced to rated output current, when operating under the conditions in Table 1.

Commented [NF4]: Need inductance of ESR quads, ZA, XP

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2.2 A suitable diagnostics suite must be incorporated into the power supply design. Diagnostic signals must be approved by TR at the design review.

2.3 The vendor must furnish all labor, equipment and materials, and perform all work necessary to design, manufacture, assemble, document, factory test, prepare and load for shipment, and deliver, F.O.B., Jefferson Lab, Newport News, Virginia.

2.4 The vendor will hold a design review to be attended by

representatives from Jefferson Lab. The TR will provide approval of the vendor’s proposed plan for demonstrating compliance to the specifications contained herein.

3.0 POWER SUPPLY SPECIFICATIONS

3.1 Input AC Power

3.1.1 The incoming AC line side of the power supplies shall have a manually-operated disconnect switch capable of padlocking in “OFF” position. Disconnect switch contacts and wiring shall be in a NEMA 4 rated enclosure inaccessible from the internal of power supply to ensure safe access to cabinet internals when LOTO is applied.

3.1.2 The load side of the disconnect switch must be monitored by an absence of voltage tester, to verify that turning the switch OFF has positively de-energized the unit. The technical representative will provide an example part number upon request.

3.1.3 Current and voltage phase monitoring shall provide interlocks to the main contactor.

3.1.4 Control and other auxiliary power shall come through a separate control power transformer which is connected to the load side of the 480 V line disconnect switch. When the disconnect switch from the 480VAC line is in the off position, the control power must be able to be energized from an external 115VAC molded case plug.

3.2 DC Output Requirements

3.2.1 The output of the power supply will be an adjustable, unipolar, DC current source that will follow a command set point issued locally or remotely.

3.2.2 The power supply shall be stable into the full range of load resistance and inductance as specified in Table 2A and 2B without requiring adjustments to loop controls.

Commented [NF5]: Jessie - is this correct usage?

Commented [NF6R5]: Yes, look for F.O.B. come time for RFQ responses.

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3.2.3 Both output terminals shall “float” electrically with respect to earth ground and chassis ground. The power supply shall be dynamically stable when either terminal of the output or the load is grounded.

3.2.4 The power supply’s regulation controls must be critically damped or overdamped, avoiding undershoot or overshoot during ramping while operating into the specified range of loads.

3.2.5 The power supply shall be equipped with an adjustable ground fault detector that will de-energize the output of the power supply and open the main contactor when a ground current over the user set threshold is detected within the power supply or load.

3.2.6 For capacitors with voltages above 50 volts or stored energy greater than 10 Joules, automatic discharge circuits must be implemented to bleed down energy once the power supply turns OFF. In addition to the automatic discharge, fully visible, manual-grounding/discharge devices shall be provided for users to apply before working inside the cabinet.

4.0 INTERFACES

4.1 The power supply shall have capability of monitoring contact closures that interface with external circuitry. Opening of any of these contacts must turn off the output of the power supply and disable the main contactor.

4.2 The power supply shall communicate with the control system serially using RS485 standard. The message structure shall conform to standard Jefferson Lab power supply communications, to be specified at a future date.

5.0 MECHANICAL

5.1 The power supply will be rated for indoor installation. The power supply shall be cooled using Low Conductivity Water (LCW) as defined in Table 1.

5.2 ENCLOSURE

5.2.1 The power supply shall be housed in sturdy metal enclosures.

Eyebolts shall be furnished for lifting the unit. Free standing power supply cabinets shall be fabricated such that a fork truck may be used to move them without damage. A fork truck or palette jack must be able to operate from the front, back or sides of the power supply cabinets, in order to lift and move them.

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5.2.2 The enclosure shall meet NEMA 2 standards for protection against accidental contact with components, protection against ingress from solid objects and falling dirt, and protection against light splashing and dripping water.

5.3 All major components used in the power supply must be listed by Underwriters Laboratory (UL) or equivalent nationally recognized testing laboratory. Custom electrical components must be proven to be compliant with UL testing for similar equipment and approved by the TR.

5.4 All electrical equipment must pass a safety inspection by the SOTR or a Jefferson Lab designated inspector. The inspection checklist will be provided to the vendor.

6.0 DESIGN ACCEPTANCE CRITERIA

6.1 After contract award, a Preliminary Design Report, including proposed circuit diagrams of the power supply and drawings of the assembly and outlines shall be a submittal requiring TR approval. Approval by Jefferson Lab of the vendor’s drawings shall not be construed to relieve the vendor of any part of the vendor’s obligation to meet all of the requirements of these specifications, or of the responsibility for the correctness of the vendor’s drawings.

6.2 Jefferson Lab will hold a Design Review and make changes and recommendations to the proposed Designs from the vendor.

7.0 PRODUCT TESTING AND ACCEPTANCE

7.1 A factory acceptance (vendor) and site acceptance (JLab) test procedure shall occur and meet standards set forth by TR.

Commented [NF7]: Danfysik doesn't put all their boards through any testing lab do they?