Commissioning of Numerical Generator Protection System
2
COMMISSIONING OF NUMERICAL GENERATOR PROTECTION SYSTEM TESTING SCHEDULE – UNIT 6 I. The following tests will be completed before rolling of the turbine. a. Testing of all relays at recommended settings along with protection schemes. b. Rotor earth fault testing at standstill condition II. The following tests will be carried out at 3000 rpm Sl. no. Description Time required (in minutes) 1. Three phase shorting at 400 KV transfer bus a. Current measurement of all CT’s at 2000 A 45 b. Generator differential simulation 15 c. Overall differential simulation 15 d. Stability checking at 9000 A 30 2. Single phase earthing at 400 KV switchyard 30 a. Simulation of REF for GT 15 b. Simulation of earth fault for GT 25 3. Three phase shorting for UAT 6A & 6B a. Current measurement of CT’s 15 b. Transformer differential simulation 15 4. Single phase earthing at 6.6 KV side a. Simulation of REF for UAT 15 b. Simulation of earth fault for UAT 15 5. OCC a. Voltage measurement at 2 KV & 15.75 15
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Transcript of Commissioning of Numerical Generator Protection System
COMMISSIONING OF NUMERICAL GENERATOR PROTECTION SYSTEM
COMMISSIONING OF NUMERICAL GENERATOR PROTECTION SYSTEM
TESTING SCHEDULE UNIT 6
I. The following tests will be completed before rolling of the turbine.
a. Testing of all relays at recommended settings along with protection schemes.
b. Rotor earth fault testing at standstill condition
II. The following tests will be carried out at 3000 rpm
Sl.no.DescriptionTime required
(in minutes)
1.Three phase shorting at 400 KV transfer bus
a.Current measurement of all CTs at 2000 A45
b.Generator differential simulation15
c.Overall differential simulation15
d.Stability checking at 9000 A30
2.Single phase earthing at 400 KV switchyard30
a.Simulation of REF for GT15
b.Simulation of earth fault for GT25
3.Three phase shorting for UAT 6A & 6B
a.Current measurement of CTs15
b.Transformer differential simulation15
4.Single phase earthing at 6.6 KV side
a.Simulation of REF for UAT15
b.Simulation of earth fault for UAT15
5.OCC
a.Voltage measurement at 2 KV & 15.75 KV15
b.Voltage balance scheme checking30
c.Over flux relay checking20
d.Under voltage and over voltage20
e.Simulation of earth faults for generator at 15 / 75 KV side20
f.Normalisation of excitation system for synchronisation60
Total time required400 minutesApproximately
7 hours.
III. Synchronisation
