Download ECP 11-0515a Lucy HV Air Metering Unit 3 Limb

Document Number: ECP 11-0515a
Date: 23/05/2016
LUCY HV AIR METERING UNIT 3 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
L3
Location
METERING UNIT
METERING Unit
Serial Number **
Burden (output VA) ***
Accuracy Class
VA
VA
0.5
0.5
Type
WOUND
WOUND
Available Ratios
400/200/100/5A
400/200/100/5A
Make ***
Ratio Selected
A
A
Pole P1 Facing Distribution
System?
YES / NO *
Voltage Transformer
L1
L2
L3
Location
METERING UNIT
METERING UNIT
METERING UNIT
YES / NO *
Serial Number **
Burden (output VA) ***
Accuracy Class
VA
VA
VA
0.5
0.5
0.5
Type
3P
3P
3P
Available Ratios
11000/6600/110V
11000/6600/110V
11000/6600/110V
Make**
Ratio Selected
V
V
* Delete as applicable. ** Available from manufacturers test certificates. *** Available from nameplate.
V
THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE
Version: 5.0
Lucy HV Air Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515a
Version: 5.0
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 VT fuse ratings are correct (6A) and continuity
()
Check 110V auxiliary fuse ratings are correct (2A) and continuity
()
Check LV links are installed
()
Check HV links are closed in tank
()
TABLE 1 Metering VT Voltage Range Selection
Phase
Metering VT 11000/110V
Common
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)
VT Insulation Resistance – 1kV Insulation Resistance Tester
Check secondary earth link in place (terminal 46)
()
Measure the insulation resistance of VT primary (HV) winding (L1 to Earth)
M
Disconnect the secondary earth link (terminal 46)
()
Measure insulation resistance of VT secondary winding (across terminal 46)
M
Reconnect the secondary earth link (terminal 46)
()
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2 of 7
Lucy HV Air Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515a
Version: 5.0
Date: 23/05/2016
VT Phasing Check – Primary Injection
Remove LV fuses/links L1, L2, L3 and N
()
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
Secondary (LV) Winding Voltage (measured at fuse)
HV
L1 – L2 (Fuses)
L2 – L3 (Fuses)
L3 – L1 (Fuses)
L1 L2
V (nominal)
V (< nominal)
V (< nominal)
L2 L3
V (< nominal)
V (nominal)
V (< nominal)
L3 L1
V (< nominal)
V (< nominal)
V (nominal)
Replace LV fuses/links L1, L2, L3 and N
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
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3 of 7
Lucy HV Air Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515a
Version: 5.0
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*
CT Ratio
Primary
Current
CT Ratio
Secondary
Current
Injected
Primary
Current*
Calculated
Secondary
Current
Measured
Secondary
Current
Ratio
Correct
[A]
[B]
[C]
[D = B / A * C]
[E]
[E = D]
L1
100A
5A
50 / 100A
A
A
A
()
L3
100A
5A
50 / 100A
A
A
A
()
L1
200A
5A
50 / 100A
A
A
A
()
L3
200A
5A
50 / 100A
A
A
A
()
L1
400A
5A
50 / 100A
A
A
A
()
L3
400A
5A
50 / 100A
A
A
A
()
Phase
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)
()
Check L3 phase CT polarity – secondary CT connection D51 (+ve) to D70 (-ve)
()
CT Relationship to VT Output
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
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4 of 7
Lucy HV Air Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515a
Version: 5.0
Date: 23/05/2016
CT Burden
Maximum CT burden per phase at metering unit terminal box
Maximum CT burden per phase at meter terminal box
1
0.5
VA
7.5
VA
Final Checks
Reconnect metering multi-core cable (if disconnected)
()
If metering multi-core cable not connected leave CTs shorted (D11, 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
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).
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.
© UK Power Networks 2017 All rights reserved
5 of 7
Lucy HV Air Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515a
Version: 5.0
Date: 23/05/2016
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]).
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6 of 7
Lucy HV Air Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515a
Version: 5.0
Date: 23/05/2016
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© UK Power Networks 2017 All rights reserved
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Lucy HV Air Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515a
Version: 5.0
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
Lucy HV Air Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515a
Version: 5.0
Date: 23/05/2016