ecp 11-0515b lucy hv air metering unit 5 limb test...

THIS

IS A

N U

NC

ON

TRO

LLED

DO

CU

MEN

T, T

HE

REA

DER

MU

ST C

ON

FIR

M IT

S VA

LID

ITY

BEF

OR

E U

SE

Document Number: ECP 11-0515b

Version: 3.0

Date: 23/05/2016

LUCY HV AIR METERING UNIT 5 LIMB TEST FORM

Full Postal Address

Import MPAN

Export MPAN

Substation Name

Substation Number

Metering Unit Serial No

Metering Unit Make/Type Lucy Sabre AMU

System Configuration 3-PHASE 3-WIRE

Current Transformer 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 400/200/100/5A 400/200/100/5A 400/200/100/5A

Ratio Selected A A A

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

Voltage Transformer 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 manufacturers test certificates. *** Available from nameplate.

Lucy HV Air Metering Unit 5 Limb Test Form Document Number: ECP 11-0515b

Version: 3.0

Date: 23/05/2016

Voltage Transformer Tests

VT Configuration Checks

Check metering multi-core cable disconnected ()

Check correct metering VT ratio selected (terminals 31 to 39) see TABLE 1 below ()

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

Check correct NPD VT Ratio selected (terminals 47 to 55) see TABLE 2 below ()

Check LV VT fuse ratings are correct (6A) and continuity (L1, L3 & N) ()

Check NPD fuse ratings are correct (2A) and continuity (da ) ()

Check 110V auxiliary fuse ratings are correct (2A) and continuity ()

Check LV fuses and links are installed ()

Check HV links are closed in tank ()

TABLE 1 Metering VT Voltage Range Selection

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

L1 E210 (33) E11 (32) E110 (31)

L2 E230 (36) E31 (35) E130 (34)

L3 E250 (39) E51 (38) E150 (37)

TABLE 2 NPD VT Voltage Range Selection

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

L1 E510 (49) E185 (48) E410 (47)

L2 E530 (52) E171 (51) E430 (50)

L3 E550 (55) E173 (54 E450 (53)

© UK Power Networks 2016 All rights reserved 2 of 10


Version: 3.0

Date: 23/05/2016

VT Resistance Tests

Check secondary earth links in place (terminal 46 and 58) ()

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



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



* Measure from the HV bushing or busbar in HV metering unit to earth, the resistance of the star connected VT to earth is 1 to 2 kΩ and 2 to 4 kΩ between phases using a multi-meter

VT Insulation Resistance – 1kV Insulation Resistance Tester

Disconnect the secondary earth links (terminal 46 and 58) ()

Measure insulation resistance of metering VT secondary (across terminal 46) M

Measure insulation resistance of NPD VT secondary (across terminal 58) M

Reconnect the secondary earth links (terminal 46 and 58) ()

VT Phasing Check – Primary Injection

Remove fuses and links L1, L2, L3 and N also fuses da and cn ()

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 Voltage

HV

Secondary (LV) Winding Voltage (measured at fuse)

NPD da–cn** L1 – L2 L2 – L3 L3 – L1

L1 L2 V V (nominal) V (< nominal) V (< nominal)

L2 L3 V V (< nominal) V (nominal) V (< nominal)

L3 L1 V V (< nominal) V (< nominal) V (nominal)

Replace fuses L1, L2 and L3 (6A) ()

Replace fuses da and cn (2A) ()

* 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 0.5 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: 3.0

Date: 23/05/2016

Current Transformer Tests

CT Insulation Resistance – 1kV Insulation Resistance Tester

CTs isolated or HV dead ()

Disconnect CT star point earth (terminal 20) ()

Measure the insulation resistance (D70 – D90 at terminal 20) M

Reconnect CT star point earth (terminal 20) ()

CT Ratio Check – Primary Injection or Prevailing Load*

Phase

CT RatioPrimary Current

CT Ratio Secondary

Current

Injected Primary Current*

Calculated Secondary

Current

Measured Secondary

CurrentRatio

Correct

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

L1 100A 5A 50 / 100A A A A ()

L2 100A 5A 50 / 100A A A A ()

L3 100A 5A 50 / 100A A A A ()

L1 200A 5A 50 / 100A A A A ()

L2 200A 5A 50 / 100A A A A ()

L3 200A 5A 50 / 100A A A A ()

L1 400A 5A 50 / 100A A A A ()

L2 400A 5A 50 / 100A A A A ()

L3 400A 5A 50 / 100A A A A ()

On completion of test ensure correct CT ratio 3 (100A), ratio 2 (200A) or ratio 1 (400A) as specified by designer is selected ()

* Delete as applicable.

CT Polarity – Flick Test

Check L1 phase CT polarity – secondary CT connection D11 (+ve) to D70 (-ve) ()



CT Relationship to VT Output

L1 CT associated with L1 voltage ** ()



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



Version: 3.0

Date: 23/05/2016

CT Burden

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

Maximum CT burden per phase at meter terminal box 1 7.5 VA

Final Checks

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

If metering multi-core cable is not connected leave CTs shorted (D11, D31,D51, D70) ()

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

All tests have been 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 forms and the CT/VT calibration certificates shall be sent to the ART mailbox ([email protected], [email protected], [email protected]).

1 The maximum CT 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.


mailto:[email protected]




Version: 3.0

Date: 23/05/2016

This page is left intentionally blank.



Version: 3.0

Date: 23/05/2016

Figure 1 – Lucy Air Metering Unit Figure 2 – Lucy AMU Legend and Wiring Diagram on Rear of Terminal Box Cover

Figure 3 – Lucy AMU Terminal Box Cover with Selected VT and CT Ratios (example

only)

Figure 4 – Lucy AMU Terminal Box with Cover Removed


Version: 3.0

Date: 23/05/2016

ecp 11-0515b lucy hv air metering unit 5 limb test...

Documents