Download ECP 11-0515c Schneider HV Metering Unit 3 Limb Test Form

Document Number: ECP 11-0515c
Date: 23/05/2016
SCHNEIDER HV METERING UNIT 3 LIMB TEST FORM
Note: This form is based on drawing RMSCH-MU6-N36 Rev F; 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-N36
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
400/200/5A
400/200/5A
Make **
Ratio Selected
A
A
Pole P1 Facing Distribution
System?
YES / NO *
YES / NO *
Voltage Transformer
L1
L3
Location
METERING UNIT
METERING UNIT
Serial Number ***
Burden (output VA) ***
Accuracy Class
VA
VA
0.5
0.5
Type
3P
3P
Available Ratios
11000/6600/110V
11000/6600/110V
Make***
Ratio Selected
V
* Delete as applicable. ** Available from CT label. *** Available from VT label.
V
THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE
Version: 1.0
Schneider HV Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515c
Version: 1.0
Date: 23/05/2016
Voltage Transformer Tests
VT Configuration Checks
Check metering multi-core cable disconnected
()
Check correct metering VT ratio selected (terminals 15 to 20) see TABLE 1 below
()
Ensure label on lid of terminal box matches VT voltage ratio selected
()
Check 110V auxiliary fuse F1 rating is 2A and continuity
()
Check VT fuse F2 and F3 ratings are 6A and continuity
()
Check LV links LK4, LK5, LK6 are installed
()
TABLE 1 Metering VT Voltage Range Selection
Phase
Metering VT 11000/110V
Common
Metering VT 6600/110V
L1
E210 (terminal 17)
E30 (terminal 16)
E110 (terminal 15)
L3
E250 (terminal 20)
E50 (terminal 19)
E150 (terminal 18)
VT Insulation Resistance – 1kV Insulation Resistance Tester
Check secondary earth link LK6 in place
()
Measure the insulation resistance of VT primary (HV) winding (L1 to Earth)
M
Remove secondary earth link LK6
()
Measure insulation resistance of VT secondary winding (across LK6)
M
Replace secondary earth link LK6
()
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Schneider HV Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515c
Version: 1.0
Date: 23/05/2016
VT Phasing Check – Primary Injection
Remove fuses F2 and F3
()
Remove link LK5
()
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
Bushing
Secondary (LV) Winding Voltage (measured at fuse/link)
L1 – L2
(F2 – LK5)
L2 – L3
(LK5 – F3)
L1 – L3
(F2 – F3)
L1 – L2
V (nominal)
V
V
L2 – L3
V
V (nominal)
V
L3 – L1
V
V
V (nominal)
Replace 6A fuses F2 and F3
()
Replace link LK5
()
* These voltages are for an injection test set and if a mains supply is used the results may differ.
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 6
Schneider HV Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515c
Version: 1.0
Date: 23/05/2016
Current Transformer Tests
CT Insulation Resistance – 1kV Insulation Resistance Tester
Check CTs isolated or HV dead
()
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*
CT Ratio
Primary
Current
CT Ratio
Secondary
Current
Injected
Primary
Current*
Calculated
Secondary
Current
[A]
[B]
[C]
[D = B / A * C]
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
()
Phase
Term
Measured
Secondary
Current
Ratio
Correct
[E]
[E = D]
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 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
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.
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4 of 6
Schneider HV Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515c
Version: 1.0
Date: 23/05/2016
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]).
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5 of 6
Schneider HV Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515c
Version: 1.0
Date: 23/05/2016
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© UK Power Networks 2017 All rights reserved
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Schneider HV Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515c
Version: 1.0
Date: 23/05/2016
Figure 1 – Schneider MU6 Metering Unit
F1
LK4
F2
LK5 LK6 F3
Figure 2 – Terminal Box with Cover Removed
12
10
Figure 3 – Fuses and Links
Figure 4 – Terminal Block
Figure 5 – CT Labels
Figure 6 – VT Labels
Schneider HV Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515c
Version: 1.0
Date: 23/05/2016
This page is left intentionally blank.
Schneider HV Metering Unit 3 Limb Test Form
Document Number: ECP 11-0515c
Version: 1.0
Date: 23/05/2016