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Document Number: ECP 11-0515d

Version: 2.0

Date: 11/07/2016

SCHNEIDER HV METERING UNIT WITH OPEN DELTA (5 LIMB) TEST FORM

Note: This form is based on drawing RMSCH-MU6-N37 Rev C; the terminal, fuse and link designations on units built to earlier revisions may differ.

Full Postal Address

Import MPAN

Export MPAN

Substation Name

Substation Number

Metering Unit Serial No

Metering Unit Make Type Schneider MU6-N37

System Configuration 3-PHASE 3-WIRE

CT L1 L2 L3

Location METERING UNIT METERING UNIT METERING UNIT

Serial Number **

Burden (output VA) ** VA VA VA

Accuracy Class 0.5 0.5 0.5

Make **

Type WOUND WOUND WOUND

Available Ratios 400/200/5A 400/200/5A 400/200/5A

Ratio Selected A A A

Pole P1 Facing Distribution System? YES / NO * YES / NO * YES / NO *

VT L1 L2 L3

Location METERING UNIT METERING UNIT METERING UNIT

Serial Number ***

Burden (output VA) *** VA VA VA

Accuracy Class 0.5 0.5 0.5

Make***

Type 3P 3P 3P

Available Ratios 11000/6600/110V 11000/6600/110V 11000/6600/110V

Ratio Selected V V V

* Delete as applicable. ** Available from CT label. *** Available from VT label.

Schneider HV Metering Unit with Open Delta (5 Limb) TestForm


Version: 2.0

Date: 11/07/2016

Voltage Transformer Tests

VT Configuration Checks

Check metering multi-core cable disconnected ()

Check correct metering VT ratio selected (terminals 11 to 19) see TABLE 1 below ()

Ensure label on lid of terminal box matches VT voltage ratio selected ()

Check correct NPD VT ratio selected (terminals 25 to 33) see TABLE 2 below ()

Check 110V auxiliary fuse F1 rating is 2A and continuity ()

Check VT fuse F2 and F3 ratings are 6A and continuity ()

Check NPD fuse F4 rating is 2A and continuity ()

Check white LV links LK4, LK5, LK7 are installed ()

Check secondary earth links LK6 and LK8 (terminal 37) are installed ()

TABLE 1 Metering VT Voltage Range Selection

Phase Metering VT 6600/110V Common Terminal Metering VT 11000/110V

L1 E110 (terminal 11) E10 (terminal 12) E210 (terminal 13)



TABLE 2 NPD VT Voltage Range Selection

Phase NPD VT 11000/110V Common Terminal NPD VT 6600/110V

L1 da2-L1 (terminal 26) E87 (terminal 27) da1-L1 (terminal 28)

L2 da2-L2 (terminal 29) dn-L1 (terminal 30) da1-L2 (terminal 31)

L3 da2-L3 (terminal 32) dn-L2 (terminal 33) da1-L3 (terminal 34)

VT Primary Winding Resistance Tests

Measure the resistance of the VT L1 primary winding (L1 to Earth) * k



All phase to earth values similar ()

Measure the resistance of the VT L1 to L2 primary winding * k



All phase to phase values similar All phase to earth values similar ()

* Measure from the HV bushing or busbar in HV metering unit to earth using a multimeter, the resistance of the star connected VT to earth is 2 to 4 kΩ and 4 to 6 kΩ between phases.

© UK Power Networks 2018 All rights reserved 2 of 6



Version: 2.0

Date: 11/07/2016

VT Insulation Resistance – 1kV Insulation Resistance Tester

Remove secondary earth white link LK6 and link LK8 (terminal 37) ()

Measure insulation resistance of metering VT secondary (across white link LK6) M

Measure insulation resistance of NPD VT secondary (across terminal 37) M

Replace white link LK6 and link LK8 (terminal 37) ()

VT Phasing Check – Primary Injection

Remove fuses F2, F3 and F4 ()

Remove white links LK5 and LK7 ()

Check the metering circuit breaker is open ()

Apply 240/110V ac from an injection test set to the primary (HV) winding, measure each of the secondary (LV) winding voltages and compare to the values in the table below*

Primary (HV) Winding Secondary (LV) Winding Voltage (measured at fuse/link)

Voltage Bushing NPD** F4 – LK7

L1 – L2(F2 – LK5)

L2 – L3(LK5 – F3)

L1 – L3(F2 – F3)

L1 L2 V V (nominal) V V

L2 L3 V V V (nominal) V

L3 L1 V V V V (nominal)

Replace white links LK5 and LK7 ()

Replace 6A fuses F2 and F3 ()

Replace 2A fuse F4 ()

* These voltages are for an injection test set and if a mains supply is used the results may differ.

** The NPD voltage measured should be in the order of 0.2 to 2V.

VT Primary (HV) Rated Voltage

VT Nominal Secondary (LV) Winding Voltage with 240/110V applied to the Primary (HV) Winding

240V 110V

11kV 2.4V 1.1V

6.6kV 4.0V 1.8V




Version: 2.0

Date: 11/07/2016

Current Transformer Tests

CT Insulation Resistance – 1kV Insulation Resistance Tester

Check CTs isolated or HV dead ()

Measure the insulation resistance (D70 – D90 at terminal 10) M

Disconnect CT star point earth (terminal 10) ()

Measure the insulation resistance (D70 – D90 at terminal 10) M

Reconnect CT star point earth (terminal 10) ()

CT Polarity – Flick Test

Open CT shorting-links (terminals 1 and 2) ()

Check L1 phase CT polarity – D11 at terminal 1 (+ve) to D70 at terminal 10 (-ve) ()

Check L3 phase CT polarity – D51 at terminal 2 (+ve) to D70 at terminal 10 (-ve) ()

CT Ratio Check – Primary Injection or Prevailing Load*

Phase

CT Ratio

Primary Current

CT Ratio Secondary

Current

Injected Primary Current*

Calculated Secondary

CurrentTerm

Measured Secondary

Current Ratio

Correct

[A] [B] [C] [D = B / A * C] [E] [E = D]

L1 200A 5A 50 / 100A A A 1-10 A ()

L3 200A 5A 50 / 100A A A 2-10 A ()

L1 400A 5A 50 / 100A A A 1-10 A ()

L3 400A 5A 50 / 100A A A 2-10 A ()

On completion of test ensure correct CT ratio low (200A) or high (400A) as specified by designer is selected ()

* Delete as applicable.

CT Relationship to VT Output at Terminal Box

L1 CT associated with L1 voltage ** ()

L3 CT associated with L3 voltage ** ()

** If all CT and VT tests are correct the CT relationship to the VT is proven and the above can be ticked

CT and VT Burden CT VT

Maximum burden per phase at metering unit terminal box 0.5 VA 0.05 VA

Maximum burden per phase at meter terminal box1 7.5 VA 0.1 VA

1 The maximum burden is based on 20 metres of 12-core 2.5mm2 or 40 metres of 19-core 2.5mm2 copper cable with a resistance of 0.0068 Ω/m at 20oC and a CT rated secondary current of 5A.




Version: 2.0

Date: 11/07/2016

Final Checks

Reconnect metering multi-core cable (if disconnected) ()

If metering multi-core cable is not connected leave CTs shorted – close shorting links (terminals 1 and 2)

()

Check all covers are secured and appropriate lock fitted to lid ()

Complete asset data form and submit to ART ()

Test Equipment

Purpose/Make/Type Serial Number Calibration Expiry Date

Certification

CT and VT calibration certificates attached ()

All tests completed satisfactorily ()

Comments

Organisation Test Operative Name

Date of Tests Test Operative Signature

A copy of the completed test form together with the CT/VT calibration certificates shall be placed in a plastic wallet in the metering unit terminal box.

A copy of the completed test form together with the CT/VT calibration certificates shall be placed in a plastic wallet in the meter terminal box (for the meter operator).

A copy of the completed test form and the CT/VT calibration certificates shall be sent to the relevant ART mailbox ([email protected], [email protected], [email protected]).


mailto:[email protected]





Version: 2.0

Date: 11/07/2016

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Version: 2.0

Date: 11/07/2016

Figure 1 – Schneider MU6 Metering Unit Figure 2 – Terminal Box with Cover Removed

Figure 3 – Fuses and Links Figure 4 – Terminal Block

Figure 5 – CT Labels Figure 6 – VT Labels

F1 LK4 F2 LK5 LK6 F3 LK7 F4 1 2 10 25 37



Version: 2.0

Date: 11/07/2016

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Schneider HV Metering Unit with Open Delta (5 Limb) Test Form Document Number: ECP 11-0515d

Version: 2.0

Date: 11/07/2016

ecp 11-0515d schneider hv metering unit with open...

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