Reveres Power Protection., Theory & Setting .
Reverse Power Protection., Theory & Setting .
Reverse Power Protection.
1- Protection against overspend 32G (# 1).
In case of Turbine Failure, the Turbine is tripped and then the Generator is tripped by operation of reverse power relay to prevent overspending of the Turbine generator unit.
2- Protection against generator motoring 32G (#2).
-Generator motoring protection is designed for the prime mover or the system, rather than for the generator.
- With steam turbines, Turbines will overheat on low steam flow, motoring results from a low input To the Ac Generator,
- When This I/P canât meet all the losses, the deficiency is supplied by absorbing real power from the system.
- since field excitation should remain the same , the same reactive power would flow as before motoring , thus, on motoring the real power will be into the generator, while the reactive power may be either flowing out or into the generator
Setting of Reverse Power Relays
Data for setting calculations
-Rated Capacity of Generator -------- 440,000 KVA
-No Load Loss of Generator --------- 1,785 KW
-No Load Loss of Turbine ---------- 1,350 KW
-No Load Loss of TG unit ---------- 3,135 KW
-Permissible Motoring Time ------- 60 Sec.
-Relay Constant ------------------- 1 P.U. = Generator KVA
Setting Of Reveres Power Relay 32G ( #1 )
1- Reverse Power Trip Level
Trip Level < No load loss of TG unit * 0.3
= 3,135 * 0.3
= 940.5 KW
Pick up = Trip level / relay constant
= 941 / 440,000
= 0.0021 P.U.
Setting = - 0.002 P.U. ( 880KW )
2- Reverse Power Trip Delay
Trip Delay < Perm. Motoring time (60 Sec.)
Setting = 50 Cycles (1 Sec.)
Setting Of Reveres Power Relay 32G ( #2 )
1- Reverse Power Trip Level
Trip Level < No load loss of TG unit * 0.5
= 3,135 * 0.5
= 1,568 KW
Pick up = Trip level / relay constant
= 1,568 / 440,000
= 0.004 P.U.
Setting = - 0.004 P.U. ( 1,760KW )
2- Reverse Power Trip Delay
Trip Delay < Perm. Motoring time (60 Sec.)
Setting = 750 Cycles (15 Sec.)
Reverse Power Protection.
#-Link-Snipped-#
1- Protection against overspend 32G (# 1).
In case of Turbine Failure, the Turbine is tripped and then the Generator is tripped by operation of reverse power relay to prevent overspending of the Turbine generator unit.
2- Protection against generator motoring 32G (#2).
-Generator motoring protection is designed for the prime mover or the system, rather than for the generator.
- With steam turbines, Turbines will overheat on low steam flow, motoring results from a low input To the Ac Generator,
- When This I/P canât meet all the losses, the deficiency is supplied by absorbing real power from the system.
- since field excitation should remain the same , the same reactive power would flow as before motoring , thus, on motoring the real power will be into the generator, while the reactive power may be either flowing out or into the generator
#-Link-Snipped-#
Setting of Reverse Power Relays
Data for setting calculations
-Rated Capacity of Generator -------- 440,000 KVA
-No Load Loss of Generator --------- 1,785 KW
-No Load Loss of Turbine ---------- 1,350 KW
-No Load Loss of TG unit ---------- 3,135 KW
-Permissible Motoring Time ------- 60 Sec.
-Relay Constant ------------------- 1 P.U. = Generator KVA
Setting Of Reveres Power Relay 32G ( #1 )
1- Reverse Power Trip Level
Trip Level < No load loss of TG unit * 0.3
= 3,135 * 0.3
= 940.5 KW
Pick up = Trip level / relay constant
= 941 / 440,000
= 0.0021 P.U.
Setting = - 0.002 P.U. ( 880KW )
2- Reverse Power Trip Delay
Trip Delay < Perm. Motoring time (60 Sec.)
Setting = 50 Cycles (1 Sec.)
Setting Of Reveres Power Relay 32G ( #2 )
1- Reverse Power Trip Level
Trip Level < No load loss of TG unit * 0.5
= 3,135 * 0.5
= 1,568 KW
Pick up = Trip level / relay constant
= 1,568 / 440,000
= 0.004 P.U.
Setting = - 0.004 P.U. ( 1,760KW )
2- Reverse Power Trip Delay
Trip Delay < Perm. Motoring time (60 Sec.)
Setting = 750 Cycles (15 Sec.)
Replies
-
narayana murthyok but i had a doubt can we use the power by reversing the reverse current before coming to machine
-
khaled hamzaSorry , I can't understand the meaning of use the reversed power !!!, how can you want using this power ?
I think reverse power is very harmful for the grid and big damage to the Steam Turbine Generator set.
Electricity , Power generation ,Thermal power plant , Solar Energy , Generators , Green Energy
-
narayana murthyoh thats the problem ok i understood the problem thanks for post nice work buddy
-
khaled hamzaat any time , i hope you really benefit from the article.
Electricity , Power generation ,Thermal power plant , Solar Energy , Generators , Green Energy
-
Harshad ItaliyaInteresting post Khaled. looking forward to see you active here.
-
khaled hamzaThank you so much , for your reply
Electricity , Power generation ,Thermal power plant , Solar Energy , Generators , Green Energy
You are reading an archived discussion.
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