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Power Supplies & Electrical Utilities. George Ganetis, Electrical Engineering Group Leader Power Supplies & Electrical Utilities ASAC Review of the NSLS-II Project Feb 1-2, 2012. Outline. Power Supplies Summary Tables Main Dipole , Multipole, Corrector Power Supplies

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power supplies electrical utilities

Power Supplies & Electrical Utilities

George Ganetis, Electrical Engineering Group Leader

Power Supplies & Electrical Utilities

ASAC Review of the NSLS-II Project

Feb 1-2, 2012

  • Power Supplies Summary Tables
  • Main Dipole , Multipole, Corrector Power Supplies
  • Power Supply Controller – Controls System Interface
  • Pendant 1 Integration & Installation Sequence
  • Power Supply Procurement Summary
  • Power Supply Summary
  • Electrical Utilities - Descriptions
  • Mezzanine Rack Layouts
  • AC Power Connections
  • Electrical Utilities Procurement Summary
  • Electrical Utilities Installation Status
  • Electrical Utilities Summary
summary table storage ring power supplies
Summary Table – Storage Ring Power Supplies

There is a total of 997 power supply channels used for the storage ring


main dipole power supply
Main Dipole Power Supply

The Dipole Main power supply has been designed in sections.

There will be two 450 Amp 600 Volt very low noise power converters that will be supply by a vender.

Preliminary design from the vender

(Applied Power Systems) has been accepted and Final Design Review is scheduled for mid-February.

The overall controls and digital current regulator has been designed by BNL and components are in house.

Minor hardware and software development remains.

Complete system should be ready for installation by ~ August of this year.

multipole corrector transport line power supply configurations
Multipole, Corrector, & Transport Line Power Supply Configurations
  • Power supplies are of a modular design.
  • The same components are used for different types of power supplies.
  • The current regulator chassis have three models that cover all the different power supplies (1 channel slow, 2 channel fast, 2 channel slow, time constant boards will add more variations).
  • The PSI chassis have two models – 1 channel & 2 channel versions.
  • There are various AC input module - They are sized for the different power converters used.
  • There are only four different sizes of commercial power converter used, this allows the same mechanical design to be used for the different power supplies.
  • There are only three different models of bipolar power amplifiers. Two low power versions and a high power version that uses a pre-regulator. The pre-regulator is one of the commercial power converters. The low power version will have different raw power supplies but use the same circuit board.
  • The ~1800 DCCTs are a single 200 A model that will have different turns going through them for different power supply current ratings. There are about 5 power supplies that require a 400 amp DCCT.
  • We are buying (and testing) separate components and assembly the power supply in their final locations and then test the completed systems in place.
multipole transport line unipolar power supplies
Multipole & Transport Line Unipolar Power Supplies

This configuration is used for Quadrupole, Sextupole, & Transport Line magnet circuits.

Two DCCTs are used, one for feedback and the other for redundant monitoring.

Power Supply Controller – Performs all high level functions for the power supply – setpoint /ramp generation and diagnostic monitoring.

There are no local controls for the power supplies. Everything has to go through the control system.

All the power supply components will be tested separately at BNL or at the vender. Final testing of the complete power supply is when they are assembled in the equipment racks.

The design incorporates a large amount of monitoring instrumentation that will be used for initial testing and operations.

Power Supply is made up of standard building blocks

multipole transport line unipolar power supplies1
Multipole & Transport Line Unipolar Power Supplies

Power Supply Interface

Power Supply Regulator


AC Input




Power Supply Interface

Power Supply Regulator

This is a standard configuration for all the 3 & 4 kW unipolar power supplies

Power Converter

multipole transport line unipolar power supplies2
Multipole & Transport Line Unipolar Power Supplies

This is a unipolar power supply current signal shown for 10 minutes.

Data was collected with the DMM/Scanner using the NSLS II control system

10 ppm


Current Signal + 2.5 ppm

The current stability is well within the power supply requirements.

sr alignment corrector power supplies
SR Alignment Corrector Power Supplies

Two channel scheme developed to reduce cost.

This block diagram is for corrector model D in the Storage Ring and Corrector A in the BSRTL

Design uses DCCTs for current feedback and has a redundant DCCTs for each channel.

Multiple turns through DCCTs is used to reduce noise levels.

The design shares some main components of each ps channel to reduce costs.

It requires the addition of components in the regulator and PSI to make it a 2 channel version.

This two channel configuration is also used for corrector models F. Model F is used for 90 mm dipole magnet trim coils. An over-voltage crowbar circuit is also added between the power amplifier and DCCTs.



Alignment Corrector Power Supplies

½ Rack Commercial

Power Converter

½ Rack Commercial

Power Converter

Single PCB for Power and Controls

½ Rack DC Powered

Bridge Amplifier

½ Rack DC Powered

Bridge Amplifier

This is the power amplifier that will be used in the 2 channel alignment power supply


Low Current Corrector Power Supplies

This power supply is used for the low current fast global corrector magnets , the 35mm aperture dipole trim coils and the LBTL corrector magnets.

The power supply can have a high bandwidth depending on the application. The power amplifier has a bandwidth of 100 kHz.

The low current of this ps and the use of shunts as the feedback element will also allow a higher bandwidth than what could have been achieved with DCCTs.

The stability requirements are relaxed compared to the alignment correctors.

This design will use the same 2 channel regulator and psi chassis as in the alignment correctors.


Low Current Corrector Power Supplies

High Reliability

Raw Power Supplies

Single PCB for Power and Controls

House Keeping

Power Supplies

This is the 2 channel power amplifier that will be used in the 2 channel low current power supply


NSLS II Controls System Interface to

Power Supply Systems

Power Supply & Controls Groups worked very closely together in developing this interface.

Software development is ongoing and has been tested in equipment being assembled in test racks in Bldg 902. and is being used in Linac phase 1 testing.


NSLS II Controls System Interfaces to

Power Supply Systems

This is the standard controls configuration that will be used in all the power supply equipment enclosure.

Network Switch

Power Supply Controller - PSC

This installation is in the Linac/Booster service building that is being used for Linac phase 1 testing.

Moxa – Serial Interface

1-Wire Interface

DVM/ Scanner

power supply integration installation for pendant 1 and linac phase 1
Power Supply Integration & Installationfor Pendant 1 and LINAC Phase 1
  • Installation will have to be done in various stages in Pendant 1 and possibly Pendant 2 depending when parts are delivered. The corrector power amplifiers and harness are the main issues.
  • Testing power supplies system components before they are installed in the machine has taken a considerable amount of resources. There are automated test station for regulators, PSIs. PSCs. and ACICMs, built and production testing is in progress. Detailed test documentation has been developed for these components.
  • Power converters, equipment shelves, and mounting hardware have been installed in most of P1 and some of P2.
  • Testing of some of the power supply controls will start when the network becomes available some time next month. This also requires the computer room to be operational.
  • A large effort was spent in getting the transport line power supplies installed and tested for LINAC phase 1. There was a steep learning curve that we had to go through to get the components ready for installation. Biggest issue was the wiring harness construction and the preparation of the regulators and corrector power amplifiers.
  • As the corrector power amplifiers get delivered they will be installed and tested.
  • High current testing can not start until DI water systems become available by mid February.
  • The complete installation of Cell 25 is our next short term goal. We should have everything for installation except the fast power amplifiers.

Power Supply Procurement Status

  • The following have been issues with the procurements over the past year:
    • Parts shortages and excessive lead times beyond historical norms.
    • Venders are not able to maintain schedules – No incentives in small contracts.
    • Design work required to fix minor problems after first article testing – Not included in schedule.
    • Late procurements due to lack of engineering and design resources. (Corrector Amplifiers & Harnesses).

Power Supply Summary

  • Power Supply designs are all done, some procurement documentation is still required for ac powered amplifiers (needed for fast correctors and 35 mm Dipole Trim Coils), cable harnesses, and Magnet Thermal Switch Interface back panel.
  • Procurements are well under way. Most of the large procurement are either complete or are in the last stages of deliveries. All remaining procurements are simple build to print RFQs. Venders are line up and are ready to submit bids. Long lead items have been already purchased.
  • Test systems have been built for all major sub system and are being used for pre-installation testing.
  • The rack layouts of the power supplies are of a mature design. First article components have been installed in test racks in bldg 902 to check for fit and to do final harnessing.
  • Software for power supply control and monitoring is operational and has been tested in bldg 902 rack setup.
  • Tests done of first article unipolar power supplies show the performance meets all technical requirement.
  • A large effort was made to get the power supplies for Linac phase 1 ready for testing. All power supplies will be operational when the water system is available. (Mid-February)
  • Storage ring installation sequence will depend on availability of the different power supply components.
  • Procurement and installation schedule is not ideal for P1 but should not be a problem for the rest of the machine.
electrical utilities description
Electrical Utilities - Description
  • Equipment Enclosures
  • Design & supply equipment enclosures (racks) for all ASD equipment that fits into standard 19” racks.
  • Enclosures will have chilled water to air heat exchangers to maintain a constant air temperature to the equipment
  • in the racks of ~ + 1 º C (Some beam instrumentation racks will have ~ + 0.1 º C temperature stability).
  • Cable Trays & PPS Conduits
  • Design & supply cable tray between all ASD equipment enclosures or standalone equipment to the devices they
  • control or power.
  • Cable tray has to meet NEC 2005, OSHA, BNL codes and regulations.
  • It is the responsibility of the subsystems to specify the cable that gets installed in the tray. EU group will check to
  • make sure all cables meet code requirement.
  • Maintain a detailed database of all installed cables – working with Controls Group in setting this up.
  • EU will install and label all cables in tray, to ensure the installation meets codes.
  • Installation of all the conduits dedicated for use in the Personal Protection Systems (PPS).
  • AC Power Connections
  • Design & supply cable, tray & switch gear (if needed) for the connection of AC power from conventional facilities load panels or circuit breakers to ASD electrical equipment.
  • Develop and maintain drawings and documentation of the AC power connections.
  • Special AC Power Equipment
  • Supply UPS power for critical loads for ASD equipment.

SR Mezzanine - Equipment Area – 1 Cell out of 30

Power supplies are installed in equipment enclosures located on the Storage Ring mezzanine ( Above the SR tunnel).

The power supplies along with almost all other accelerator equipment are installed in temperature controlled enclosures.

Power Supply RG A

Beam Instru.


Power Supply RG B

Power Supply RG C

Vacuum & EPS




Insertion Device


3-D Model of Equipment Enclosures & Cable Tray

sr mezzanine equipment area top view
SR Mezzanine - Equipment Area – Top View
  • AC Power Distribution Centers supply both normal power & UPS power to racks and various pieces of standalone equipment.
  • UPSs will be used for power supply controls and control system equipment.

This is one of 30 Cells

Front of enclosures

Conduits to Tunnel

Front of enclosures



UPS Power Distribution

AC Power Distribution

ac power connections
AC Power Connections

One line diagram for mezzanine storage ring cell

There is a separate drawing for each of the 30 cells

Power feeds to ASD equipment enclosures & UPS, also feeds experimental beam lines.

The design uses motorized circuit breakers to minimize arc flash hazards

One line diagrams also exist for SR main dipole, SR RF, SR Service Bldgs., & Booster and LINAC.


Pendant 1 SR Mezzanine - Equipment Area - Status

  • All Equipment Enclosures (Racks) are installed in P1 & P2
  • Normal & UPS AC power is installed in P1 & P2
  • Process Chilled Water has been connected to the rack heat exchangers in P1 & ½ P2
  • Power Supply Output Cable Installation is complete for P1 has started in P2
  • Most other system cables are installed for P1.
  • Front end & magnet thermal switch cables still need to be pulled in P1.
other areas electrical utilities status
Other Areas – Electrical Utilities Status
  • Computer Room
  • AC power distribution required a considerable effort to design the system for this area.
  • All racks, cable tray, and AC power has been installed.
  • A new UPS configuration has been designed and installed in an adjacent room.
  • Process chilled water has been connected to the rack heat exchangers and the temperature controllers have been commissioned and are operational.
  • RF Building
  • Ac power has been connected to the two large transmitters. The connection was done to remotely operated circuit breakers that minimize arc flash hazards.
  • Instrumentation cable tray and AC power still has to finish design and then needs to be installed.
  • Injector Complex
  • LINAC cable tray has been installed using BNL staff. NSLS-II engineering was greatly involved in the final design. This ensured that the installation would meet electrical codes.
  • Transport Line cable tray for the LINAC to Booster is installed and all cables for phase 1 are installed and over half for phase two is done.
  • Equipment enclosures have been installed for the LINAC transport line. Process chilled water has been connected to the heat exchangers, and cooling system is operational.
  • Work is continuing in the rest of the injector building for the rest of the cable tray and AC power distribution for the Booster and the Booster to Storage Ring Transport Line. Due to the limited space this installation is proving to be very difficult and is requiring more resources then originally planed.

Summary for Electrical Utilities

Storage Ring Mezzanine

  • Cable tray installation work done by the building contractor is progressing well. P1,P2, P3 & P4 are complete and P5 should be started in early February.
  • AC power connections for standard equipment enclosures in P1 & P2 are completed. Work has started in P3. Work on the SR mezzanine is greatly slowed due to lack of Electrician resources. Once the work in the Linac & Booster is done, the rate of work in the mezzanine will greatly increase.
  • Installations to date have been inspected for NEC compliance and there have no issues.

Storage Ring Tunnel

  • Some minor design work still need to be done for front ends and straight sections.
  • Work will be required to install very small trays for vertical cables going to the girders.


  • The Linac cable tray and AC power connection required more resources then originally planed.
  • Installation of all electrical utilities in this area is more difficult than other areas due to the limited space and existing building utilities. More resources will be needed to finish the installation.
  • Cable pulling is also more difficult due to the limited space. It was critical to do detailed planning to ensure the correct cables are installed in the correct sequence.

RF Service Bldg & Computer Room

  • RF Transmitter connected to Sub-station. Instrumentation cable tray and power to be installed next.
  • Computer room installation is complete, all electrical utilities are complete.

Backup Information Slides

  • The rest of the slides in this presentation are the following:
  • Summary table for transport line power supplies.
  • Dipole magnet circuit.
  • More details in the configurations for different power supply models.
  • Some other pictures of first articles components.
  • Simple description of the thermal switch interlock used to protect the magnet loads
  • Power supply rack layouts for SR mezzanine
  • Equipment Enclosures Information
  • UPS Information
  • Electrical Utilities pictures
summary table transport line ps
Summary Table - Transport Line PS
  • Transport line power supplies will use same hardware as the storage ring. Current Regulator, PSI, PSC, DVM /Scanner, 1-Wire devices, Corrector Power Amplifiers & Commercial Power Converters.
  • Certain dipole power supplies have to be modified to service as critical devices for PPS system.

There is a total of 89 power supply channels used for both Transport Lines


nsls ii dipole magnets electrical circuit
NSLS-II Dipole Magnets Electrical Circuit

Dipole circuit is “folded” so there is not a large cabling loop.

Magnet circuit load =1.561 H + 2.404 Ω

Every Dipole magnet has a trim coil that will be powered. Small aperture magnets has a 1% trim, large aperture magnets have a 3% trim.

Note: Large aperture dipole trim power supply no longer needed. Adequate trim is provided by local trim coils.

storage ring sextupole power supplies
Storage Ring Sextupole Power Supplies

Sextupole magnet circuits have either 6 or 2 magnets in series.

For the sextupole power supplies a global PLC is used to monitor all magnet thermal switches and then will shut down the correct sextupole power supply if an over-temperature condition occurs..

transport line ps quadrupole with polarity reversal
Transport Line PS - Quadrupole With Polarity Reversal

This configuration is used for Quadrupole magnet circuits needing polarity reversal.

Standard commercial power converters are being used. Same ones as SR.

Two DCCTs are used, one for feedback and the other for redundant monitoring.

The 2nd DCCT is located on other side of reversing switch to confirm polarity.

These ps are designed to be installed in the same temperature controlled racks as SR.

PSIs, PSCs, AC input modules, instrumentation and controls are the same as SR.

Operation of polarity reversals will be done through PS controller.

There is a free wheeling diode on the output of the power converters

transport line ps low power corrector ps
Transport Line PS Low Power Corrector PS

This ps uses the AC power amplifier which is the same basic model as the SR corrector model E.

The magnets are natural convection air cooled and do not have thermal switches.

The functions of the AC control module is incorporated into the power amplifier chassis.

power supply first articles
Power Supply First Articles

Power Supply Controller

First Article Power Supply Regulator Controller - Dual Channel

First Article Power Supply Interface - Single Channel

series magnet circuits thermal interlock system
Series Magnet Circuits Thermal Interlock System

This system is used when multiple magnets are powered in series. (Dipole & sextupole)

One Interlock Chassis is located in each cell.

Single PLC located in computer room

Ethernet SCADA/Control Network


Thermal Switches

Input From Thermal Switches

Power To Magnet


Interlock Relay To Power Supply Controller



Power Supply Regulator/Controller


Power Supply Rack Group B Configurations

Within each of the 30 cells of the storage ring there are 3 power supply rack groups. A,B&C (~90 rack groups total)

Network switches and a PS IOC share one rack bay in rack group B.

There is only a small amount of cables that leave a PS rack group – network, timing, PS output, Thermal Switch, & 1-wire.

About 10 kW of heat is dissipated in each power supply rack group.

This configuration is for Rack Group B


Power Supply Rack Group A & C Configurations

Cables between the PSI & Regulator will be done with simple & reliable flex circuits.

Most other cables will be short in length to connect the DCCTs, Power Converters, Amplifiers, & AC input Modules.

Almost all of cables will be pre-tested before installation.

This configuration is for Rack Group B

equipment enclosure cooling system
Equipment Enclosure Cooling System

System has a closed loop air cooling system.

Equipment inlet air temp. is held constant at 24 °C.

System is design to remove ~ 5 kW of heat from each heat exchanger using 13°C chilled water.

Two temp. control systems are available.

Low precision + 1°C

High precision + 0.1°C

Equipment installed in the enclosure should take advantage of the front to back cooling flow.

equipment enclosure details
Equipment Enclosure Details

Equipment Enclosures are NEMA 12

Can install either 19” or 24” panels.

Transparent front & solid rear doors.

Depth of enclosure is 40” from outside front door face to rear door face.

Available installed equipment height is 42 U (73.5”)

The number of racks in the enclosures can be 2,3,4,& 5.

3 to 5 rack enclosures will have 4 Heat Exchangers (20 kW Cooling Capacity) 2 rack enclosures will have 2 heat exchangers ( 10 kW Cooling Capacity)

Enclosures will be mounted to the floor using vibration isolation mounts.

Enclosures are insulated to minimize heat load to the facility.

All enclosures will have temp. sensors, humidity sensors, & smoke detectors.

Water & power connection to heat exchanger

Rotex Cable Seals

Fans are in each heat exchanger

Front Plenum is the space between the Lexan door and the front panel of the installed equipment

Front Plenum Fans

Heat Exchangers

number of equipment enclosure configurations
Number of Equipment Enclosure Configurations

The quantities include all Storage Ring and Injector Systems requirements.

Baseline estimate is 480 racks, there is an increase of 94 racks.

~ 43 BI,~ 20 Booster, ~ 12 Controls , ~ 8 RF.

Baseline did not include the High Precision Temperature Control used for SR Beam Instrumentation

RG = Rack Group

HPTC = High Precisions Temperature Control

LPTC = Low Precision Temperature Control

There are one set of each rack group as spares for a total of 588 racks

special ac power ups
Special AC Power – UPS
  • There are 31 – 30 KVA UPS units located in the storage ring mezzanine. One for each Cell & Injection Straight. There are 2 30 KVA UPS for Injector Systems, One for SR RF, and three for the Computer Room.
  • The SR RF cryogenic system recovery compressors, cryogenic systems controls, and computer room are on emergency generator power.
  • The UPSs are for powering control systems and have a very short hold up time. (Minimize battery replacement costs.) Just enough for the controls to do an orderly shutdown of the system. They also serve as a power line conditioner.

Computer Room & RF Service Bldg.

Computer Room Server Racks

UPS Room

800 Amp Motor Operated

Circuit Breaker to RF KSU Transmitter



Injector Complex

Booster Tunnel Cable Tray

Equipment Racks in the

L/B Service Bldg.