Trafo Hvoc Testing Protocol.docx

Project No.:

RIT No.:

Project Name: Document Description: Location:

Substation

Equipment Description:

HV Over Current & Earth Fault Relay of Transformer - 1

INSPECTION [ √ QIP Item No. (viii)

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TEST [

√

]

Description of Inspection / Test Activities

DATE: Ref. Doc. No.

Testing of Over Current Protection Relay Testing

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General Data:

Line/Feeder

Power Transformer T-1

Serial Number

Relay Type

HV Over Current & Earth Fault

Relay Model/Make

CT Ratio

System Voltage

Relay Checks: Items

Status

Visual Inspection Relay Damaged Rating Information Case Earth Installed Test Block connection checked

Relay Energized Relay Auxiliary Supply Relay Healthy LED Working Alarm LED Working Trip LED Working

Measurement Checks Input

CT Ratio

Injected Current (A)

Calculated Current (A)

Measured Current (A)

A

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B C

Over Current (Low Set) I > Curve: IEC S Inverse

Pick Up Test

Phase

Set Pick Up Current (A)

Observed Pick Up (A)

Drop Off Current (A)

AB BC CA ABC

Trip Time Test (2X) TMS = Phase

Injected Current (A)

Calculated Time (Sec)

Observed Time (Sec)

AB BC CA ABC

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Over Current (High Set) I >> Curve Type: Instantaneous Trip

Trip Time Test (x1.2) Phase

Set Pick Up Current (A)

Injected Current (A)

Set Trip Time

Observed Time (Sec)

AB BC CA ABC

Earth Fault (Low Set) Ie > Curve: IEC S Inverse

Pick Up Test Phase

Set Pick Up Current (A)

Observed Pick Up (A)

Drop Off Current (A)

Injected Current (A)

Calculated Time (Sec)

Observed Time (Sec)

A B C

Trip Time Test (X2) TMS = Phase

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A B C

Earth Fault (High Set) Ie >> Curve Type: Instantaneous trip

Trip Time Test (x1.25) Phase

Set Pick Up Current (A)

Injected Current (A)

Set Trip Time

Observed Time (Sec)

A B C

Testing Equipment Data: Name of Equipment: Model/ Type: Manufacturer: Serial No: Calibration Expiry Date:

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