1. REPORT:
NTDCL deal with two types of transmission:
500KV
220KV
220KV Shalimar II Transmission grid station
Two input feeder:
Ravi
Kala Shah Kaku
Bus Bar
Type:
Double line single breaker scheme(Delta Type)
Power line Carrier (PLC)
Learn about:
1. Wave guider 2. Wave trap
Drawing of different section of grid station (As BUILT)
MCB
LAMP Test
Acknowledgement
Reset
Router Alarm
Interrupt Recorder
Bus Bar (Drawing)
Distance Protection Relay:
Zone one:- Resistance=2.3 ohm ,Trip Time=instant and 80% line
Zone two:- Resistance=2.8 ohm ,Trip Time=350 ms and 80 to 120%
Zone three:- Resistance= ,Trip Time=700 ms and 120 to 150%
Fault measure interm of impedance
Impedance=V/ I
Relay:-
Characteristics:
Selectivity AND Reliability
Important Concept of
Load encroachment: Heavily Loaded System , Current Largely increase
2. SOFT: Switch onto fault
Stub Protection: Breaker to Bus Bar Fault
Breaker open
Fault occur (over current protection)
Auto Reclouser:After the fault of 100 ms it try to close the circuit
Permissive under reach: Distance Protection using tele communication network
DTT: Direct Transfer Trip
Zone 2 relay is active than source of grid is off.
Transformer Protection System
HV side to LV side Protection
HV side to Bus Bar
LV side Protection
Over Current Protection
Over Flux Protection
Earth Fault Relay
Transformer Test
TTR (Transformer turn ratio test)
Insulation (Meager test setup)
Winding Resistance
Transformer Vector group
Dy n-11
Difference between insulator and Breaker
OFF Load and ON Load Devices
Breaker types on the bases of operating mechanism
Surge arrester and lightning arrester
220KV GIS (gas insulated station) control room operating mechanism
132 KV GIS (gas insulated station) control room operating mechanism
Auto transformer 160 MVA winding used for local use of grid station
DC Batteries room for the use of DC operating Loads
Relays, indicator lights and telecommunication devices etc.
Fault detection and Allocation Place (theoretically)
Drawing of Transformer Protection System
