1. 0.306 p.u.
2. 0.33 p.u.
3. 0.318 p.u
4. 0:328 p.u.
0.306 p.u.
1. protects terminal equipment against travelling surges
2. protects transmission line against direct lightning stroke
3. suppresses high frequency oscillations in the line
4. reflects back travelling wave aproaching
protects terminal equipment against travelling surges
1. long overhead line is switched off
2. bank of capacitors is switched off
3. transformer on no load is Switched off
4. heavy load, is switched off
transformer on no load is Switched off
1. direct strokes of lightning
2. power frequency of over voltages
3. over voltages due to indirect lightning stroke
4. over currents due to lightning stroke
over voltages due to indirect lightning stroke
1. second harmonic current
2. third harmonic current
3. fifth harmonic current
4. seventh harmonic current
fifth harmonic current
1. produce of rated breaking current (kA) and rated voltage (kV)
2. product of rated symmetrical breaking current (kA) and rated voltage (kV)
3. product of breaking current (kA) and fault voltage (kV)
4. twice the value of rated current (kA) and rated voltage (kV)
produce of rated breaking current (kA) and rated voltage (kV)
1. excitation control
2. phase shifting transformer
3. single pole switching of circuit breakers
4. increasing the turbine valve opening
excitation control
1. A and B
2. A and C
3. B and C
4. only at C
A and B
1. 100MJ
2. 400JM
3. 800MJ
4. 12.5MJ
800MJ
1. maintain voltage- at the rated voltage level
2. maintain frequency exactly at 50 Hz
3. maintain a spinning reserve margin at
4. maintain synchronous between machines and on external tie lines
maintain a spinning reserve margin at