ECP 11-0307 High Impedance Earth Fault (REF) Protection Test Form

High Impedance Earth Fault (REF) Protection Test Form / Document Number: ECP 11-0307
Version: 3.0
Date: 12/12/2016

High Impedance Earth Fault (REF) Protection Test Form

Substation Name
Substation Number
Circuit
General Data
Serial Number(s)
Manufacturer
Manufacturer Type Reference
Rating
CT Ratio
Trip Supply / V dc
Details of Flag
Details of Auxiliary DC Element
Nominal Value of High Impedance Relay Stabilising Resistance / 
Recommended Setting of High Impedance Relay
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………………..
Measure and record pilot resistance using, where necessary, the lead resistance diagram shown in test form ECP 11-0304
Loop resistance of neutral CT / 
Loop resistance line CTs / 
High Impedance Relay and Stability Resistor / 
Mechanical Inspection / ( or n/a)
Mechanical Inspection
Secondary Injection – Attracted Armature Element
Minimum operating current or voltage at recommended setting / Plug Setting / Operate / Reset
`CT shorting' contact checked for draw out chassis, if applicable
Fault Setting Tests (injection across the relay buswires)
Secondary current to produce relay operation
Equivalent primary current
Auxiliary Element
Function / Operate / Reset
Primary Injection Tests
The details and results of all primary injection tests are to be recorded on test form ECP 11-0303
Local Primary Injection / ( or n/a)
To establish ratio and polarity of line CTs as a group
To establish ratio of neutral CT
Overall Primary Injection
Balance tests to provide correct interconnections - between line and neutral CTs
Fault Setting Test
The relay is to be checked to establish the earth fault setting by injecting through the neutral CT / Fault / Primary Current to Product Relay Operation
Calculated / Actual
N-E
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
Prove `trip isolation' for draw out chassis, if applicable
Alarms correctly initiated / Local
Telecontrol
On-load Tests
These tests are to be carried out under the direct supervision of the Commissioning Engineer
Load current (circuit ammeter) / A
EquivalentCT current / A
Earth fault relay current/voltage / V/A
Voltage across buswires / A
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