ECP 11-0311A SOLKOR R and RF Feeder Unit Protection Test Form

SOLKOR R and RF Feeder Unit Protection Test Form / Document Number: ECP 11-0311a
Version: 2.0
Date: 12/12/2016

SOLKOR R and RF Feeder Unit Protection Test Form

Substation Name
Substation Number
Circuit
General Data
Relay Serial Number
Rating
CT Ratio
Component Box Serial Number
(for 15kV type protective scheme)
Trip Supply / V
Pilot Type
Pilot Supervision Transformer Serial Number
Pilot Supervision Supply Relay Serial Number
Pilot Fail Relay Serial Number
Wiring / ( or n/a)
Insulation resistance (see test form ECP 11-0301)
Inter relay and cubicle wiring checked to: / Circuit diagram number………………..
Wiring diagram number………………..
Pilot Details / ( or n/a)
Insulation (pilots disconnected at both ends) / Core 1 to earth
Insulation test voltage determined by type of pilot / Core 2 to earth
Loop resistance (jointed at remote end) / Core 1 to core 2
Pilot Padding Resistance Details / ( or n/a)
Padding resistance required = ½ (SV – loop resistance)/T
Padding resistance setting
Pilot Overall Loop Resistance (including padding resistance)
Transformer Terminal / Transformer TapValue (T) / Maximum Pilot Loop Resistance (SV) / Capacitance Maximum Between Cores µF
SOLKOR R / - / 1.0 / 1000 / 2.5
SOLKOR Rf without isolating transformers / - / 1.0 / 2000 / 0.8
SOLKOR Rf withisolating transformer / F2 / 1.0 / 1760 / 1
T2 / 0.5 / 880 / 2
T1 / 0.25 / 440 / 4
Mechanical Inspection / ( or n/a)
Mechanical inspection
Secondary Injection
Inject at Relay Panel across CT Connections
Relay to operate at ±10
Fault / Secondary to current produce relay operation / Operating element current (mA dc) / Typical secondary fault setting as percentage
5kV Insulation / 15kV Insulation
Local Relay / Remote Relay / Local Relay / Remote Relay / N Tap / N1 Tap / N Tap / N 1 Tap
R - N / 25% / 18% / 33% / 23.5%
Y - N / 32% / 21% / 41% / 27.5%
B - N / 42% / 25% / 55% / 33%
R - Y / 125% / 165%
Y - B / 125% / 165%
B - R / 62% / 82.5%

Notes:Operating current should be approximately 11mA dc for Solkor R. With local injection the remote relay, if correctly connected to the pilots, should operate at approximately double the setting of the local relay. If not correctly connected, both relay currents will be approximately equal. Secondary fault setting includes CT magnetising current and pilot capacitance. Normally, capacitance below 2.5µF will not alter values appreciably.

For SolkorRf the operating current is approximately 11mA dc at both ends when injected at one end.

Guard Relays (if fitted)
R / Y / B / E/F
PU Current
DO Current
Pilot Supervision (where applicable)
Send End / Receive End
Check correct tapping selected for AC voltage to be applied
AC voltage selected
Carry out injection of supervision receive relay with pilots disconnected / Pick-up current*
Drop-off current*
Check pilot supervision supply fail alarm
Check pilot fail alarm (pilots open)†
Check pilot alarm (pilots shorted)
Check pilot fail alarm (pilots crossed)†
Measure DC voltage with a pilot link removed (pilots open)
Measure DC current across open pilot link (pilots crossed)
Measure DC current across open pilot link (pilots normal)
Measure DC voltage with ilot link replaced (pilots normal)
* The pick-up current should not be greater than 3.5mA and the drop-off current should not be less than 1.5mA.
† Pilot supervision current should not be less than 4mA (pilots normal) but should be less than 1mA (pilots crossed)
Draw out Relay Checks / ( or n/a)
Check CT shorting contacts
Check DC series contacts (where applicable)
Primary Injection Tests
Local Primary Injection / ( or n/a)
To establish ratio and polarity of local end CTs as a group
To establish correct interconnections between CTs and relay panels
Overall Primary Injection
Balance tests to prove that local and remote groups of CTs are correctly connected relative to each other.
When three-phase injection is available tests should be carried out in the manner set down in the Operation and Stability Tests section, the results being recorded in the Operation and Stability Tests table with appropriate cross-reference.
Note, in many cases overall primary injection will be impracticable, in which case the correctness of interconnections is to be established by using the method detailed in the Operation and Stability Tests section.
Fault Setting Test
Using single phase primary injection, simulate single phase earth fault conditions at the local end only. Measure and record the currents at which local and remote relays operate.
Fault / Primary Current to produce Relay Operation / Operating Element Current (mA dc) / Nominal primary fault setting as percentage of relay rating referred to the primary side
5kV insulation / 15kV insulation
Local Relay / Remote Relay / Local Relay / Remote Relay / N tap / N1 tap / N tap / N1 tap
25% / 18% / 33% / 23.5%
DC Operation / ( or n/a)
Manual operation of relay results in correct operation of appropriate indicators and auxiliary relays
Prove functional links, fuses, auxiliary switches, test switches, etc to diagram
Alarms correctly initiated / Local
Remote
On-load Tests (Operation and Stability Test)
These tests are to be carried out under the direct supervision of the Commissioning Engineer.
Notes - this test will produce a tripping condition.
The load current should preferably be equivalent to at least 50% of the relay rating. If this is not practicable, a reduced load is acceptable, but it may then only be possible to measure the operating element current and not to indicate whether the relay operated or remained stable. Where it is not practical to carry out load tests, then for short feeders check the stability by primary injection.
These tests simulate 'through' or 'in-zone' fault conditions by unbalancing the current inputs to the protection at each end, using the method of shorting and disconnecting individual CT secondary windings from the relay inputs. Incompatible phase colour connections at the two ends will therefore be detected by unexpected operation or unusually high operating-element currents.
Short and disconnect Solkor CTs not in use for each test, eg for R-N, short and disconnect Y & B CTs .
Local End / Remote End
CT Connections (phases NOT shorted and disconnected) / Primary Current / Element Operating Current mA dc / CT Connections (phasesNOT shorted and disconnected) / Primary Current / Element Operating Current mA dc
Operate / Stable / Operate / Stable
R-N / R-N (Reversed)*
R-N / R-N (Normal)
R-Y-N / R-Y-N
Y-B-N / Y-B-N
R-Y-B-N / R-Y-B-N
Comments
Test Equipment
Purpose / Make/Type / Serial Number
Certification / ()
All tests have been completed satisfactorily
Contractor Commissioning Engineer (if applicable)
Organisation / Name
Date / Signature
UK Power Networks Commissioning Engineer
Name / Signature / Date