1

RWM POWER FEED TO EACH COIL

S. Ramakrishnan

01/29/2010 2

RWM COILS

Existing Status The Six RWM coils are grouped in pairs Each Pair is fed from one sub-unit of SPA

which has 3 sub-units Each coil has two turns. Maximum of 3.33kA

Pulsed power feed. Three dedicated ckts. & power loops for

RWM Coils exist P13 circuit (EEF2-PSS-1A) is the DC link

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PROPOSED CHANGES

Proposed Change Each RWM coil is to be individually fed WP# 1513 was initiated to for the change One new Switching Power Amplifier (SPA2) has been

ordered with the specification revised to reflect all the modifications done by PPPL. In addition strict bifurcation of Power & Control sections has been specified.

SPA2 is similar to existing one with 3 sub-units Each sub-unit will switch up to 3333 Amps. ESW of SPA units - 6 seconds every 300 seconds.

Existing SPA (SPA1) will continue to be fed from the EEF2-PSS-1A, 1kV FCPC Transrex PS – See Sh. 1563

New SPA (SPA2) will be fed from the HF 1kV FCPC Transrex PS – See Sh. 1563B draft

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Additional Analog Coil Protection (ACP) (3) will be provided

Hardwired Control interfaces as required will be installed

Kirk Key system will be integrated with the rest of the System

Six grounding switches will be purchased and installed inside the NSTX test cell for the six RWM coils

PROPOSED CHANGES Contd.

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Change Implementation LOCATION New SPA to be located in the room adjacent to existing SPA

– Room 234 in FCPC 2nd floor. The new DGSs shall be located in Room 234 which has to be

cleared

Power cabling Changes FCPC to NSTX Test Cell)

– Presently 4-1/c 500mcm CABLE is installed for each of 3 ckts - 2-1/c 500mcm are in parallel in each leg.- Propose to release one conductor from each parallel

and use it for the new circuits FCPC

– Provide required cabling from new SPA and new SDS– Provide Jumper cables from existing SDS to new SDS.

NSTX Test Cell Reconnect the coils to the respective power feed inside the RWM box with appropriate links

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To provide an alternate means of shorting and grounding and to lockout and tagout the NSTX Resistive Wall Mode coils. This will be done inside NSTX Test Cell.

To provide an additional level of safety when the primary means of shorting and grounding may be compromised during maintenance and other testing.

To provide a visible means, within the test cell, to ensure that the RWM coils are shorted and grounded.

By design of the grounding switch enclosure is a means for personnel to lockout and tagout the RWM coil systems.

To remain consistent with the other NSTX coil systems regarding grounding and lockout tagout.

Provide Safety Grounding Switches for each of the six coils(BY Don McBride)

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RWM1

RWM2

RWM3

RWM4

RWM5

RWM6

B-RWM-01

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27

39

6 7 1/2 7 1/2 6

6 1

/2

6

4 1

/2

14

1/2

2 1/2 5 2 1/2 5 2 1/2 3 5/8

10

10

6 3

/4

1 2

PANEL IS 1/2"THICK GPO-3

1" X 1/8"BUS BAR

EACH AUXILIARY SWITCH IS CONNECTEDIN SERIES AND T ERMINATED HER E.PROTECT WIRING F ROM POTENTIALHIGH VOLTAGE TERMINALS.

RWM1 RWM2 RWM3

RWM4 RWM5 RWM6

THIS PANEL TO BE FITTED IN A HOFFMAN ENCLOSUREMODEL #A42N3013 WITH T-HANDLE, GROUNDING DEVICE,AND DOOR WINDOW KIT.

TB1GS-RWM6AUX.

GS-RWM5AUX.

GS-RWM4AUX.

GS-RWM3AUX.

GS-RWM2AUX.

GS-RWM1AUX.

ELECTRICAL SCHEMATIC

AUX. SWITCHES SHOWNW/ MAIN SWITCHES INCLOSED POSITION

TB1

2

1

Ground Switch Enclosure

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P1

M2

NSTX TEST CELL PLANSCALE 1/4" = 1'-0"

N5

FLOW SW. RACKS

B

6(I2

)

12(H3)

4(J2)

L

N404

N

N405

N405

N

L

5712 5704

5707

5703

5702 5701

15(J3

)

(C14)

N404 L404

WATER SKID

DN

.

CRANE H AU NCH

HEATING/COOLINGSKID

PD-345EL.105'0"

C

17(H 2)

5718

FOR DETAILED INFOR MATIONREFER TO D WG.D -EA3501

FI NISHED FLOORDEC K 9" ABOVE

945

4BA109A-3/4"NMFCTC -EE-408

4BA108A-3/4"N MFLLT-945

MGS

~12'-10"

P4

50

6000

41568TP-3" PVC

DN

EXISTIN G 7"D.HEATING PIPES

20081B-2"EL.108'-0"(SEE NOTE 6)

FI BER GLASS BARR IER TYP.

41575C A-3", ALUM. EL. 107'-7"

FI BER GLASS

TR AY L/N404

P451

12"

L

PCB-52

~12.0"

18(H2)

RWM4 41568U P-3" PVC

41568R P-3"PVC

T8 07 (TRAY)

1/C-500mcm CABLE

41568R P-3" PVC

B-RWM-01

NSTX Test Cell – Partial PlanDon McBride

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Picture showing proposed locationDon McBride

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SPA Input disconnect and ground switch (DGS) enclosure to be provided with a kirk key for accessing the cabinet. The enclosure can be accessed only if the SLD is vented.

Each of the three new output disconnect switches to be provided with kirk keys as follows: Kirk lock to access the Power component enclosure.

The power component enclosure for each switch can be accessed only if the SLD is vented.

A Kirk key will be released only if the switch is in the grounded position.

In order to gain access to the NSTX Test Cell etc. it is necessary to i) Vent the SLD and ii) All the six RWM-SDS shall be in the grounded position.

KIRK KEYSBy Don McBride

01/29/2010 12

PPPL will modify the existing Kirk key system by: Removing the existing transfer block located

on the 2nd floor FCPC and returning it to the Kirk Key Company.

The existing transfer will be replaced to accommodate the additional Kirk locks with a new transfer system mounted in an enclosure/transfer panel built by Kirk.

Estimated cost is about $2.5k.

Kirk Key Changes Contd.By Don McBride

01/29/2010 13

Perform PSCAD analysis of new scheme Power balance analysis of new scheme shows that DC link

SPA is adequate. It takes about 675Amps from the DC link during pulsing at rated current.

The 4/C cable from FCPC to NTC was reconnected with two conductors feeding one coil and the other two feeding another coil. Performance was satisfactory.

ANALYSIS/TESTS

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FOLLOWING TERMINALS ARE IN THE BOX B-RWM-1:

FROM FEED: SU1P, SU1N, SU2P, SU2N, SU3P, SU3N

TO COILS 1A, 1B; 2A, 2B;3A, 3B; 4A, 4B; 5A, 5B; 6A, 6B,

Circuit CONFIGURATION

SPA1-SU1 CKT WILL BE JUMPERED TO FEED RWM COIL 3

SPA1-SU2 CKT WILL BE JUMPERED TO FEED RWM COIL 2.

SPA1-SU3 CKT WILL BE JUMPERED TO FEED RWM COIL 1.

SPA2-SU1 CKT WILL BE JUMPERED TO FEED RWM COIL 6

SPA2-SU2 CKT WILL BE JUMPERED TO FEED RWM COIL 5.

SPA2-SU3 CKT WILL BE JUMPERED TO FEED RWM COIL 4.

Notes: Resistors (1kOhms 50W), across each coil is to be provided

RWM BOX CONNECTIONS

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FCPC 2nd Fl. NBPC

SPAProposed location

FutureNCSX Trays

NTC

Routing of cable from FCPC to NTC as installed

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Circuit - Parameters

Location of SPA

Cabling Length(500mcm- 600V)

# of condtrs used per pole

Cable Lead (R mOhm)

Cable Lead (L- uH)

Cable within Test Cell & other

50’ 1 2.5 11

FCPC 2nd Floor (North-East)

385’ 1 16.0 45

Total lead impedance 18.5 56

Total loop Impedance with coils 19.1 71

Each Coil: R = .6 mOhms; L= 16 uH)

Table

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CWD – 1563B DRAFT

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HCS interface will be provided as for SPA-1 A CICADA Rack will be installed inside Room 234

for SPA-2

SPA is self-protected ACP to be provided to protect each of new RWM

circuits Bob Marsala has designed units similar to existing

ACPs.

CONTROL & PROTECTION

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CONTROL CABLING: Provide control Cables as required within FCPC

and from FCPC to the Junction area WATER LINES:

Install water lines as required to SPA.

Control Cabling & Misc.

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