Consider the system below. Suppose relay Rab is a directional comparison blocking relay using directional mho relays for tripping and reversed mho relays, without offset, for blocking. If the carrier trip settings for the phase relay Rab is equal to 4.502 at 80° and line resistance is neglected, then the carrier start settings for the phase relay Rab would be equal to: VLL Z1-AB 138 kV 4+j30Q B Z1-BC 7+j60 A Z1-BD 2+j20 中 Rab Maximum load 120 MVA Relays settings Torque angle CT ratio 0.2 to 10 75° or 80° 500:5 1150:1 VT ratio Select one: O a. 6.5 at 80° O b. 4.5 at 80° ○ c. 8.5 at 80° Od. 2.5 Q at 80° 中 Ribc 中 Rad

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter10: System Protection
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Consider the system below. Suppose relay Rab is a directional comparison blocking relay using directional mho relays for tripping and
reversed mho relays, without offset, for blocking. If the carrier trip settings for the phase relay Rab is equal to 4.502 at 80° and line resistance is
neglected, then the carrier start settings for the phase relay Rab would be equal to:
VLL
Z1-AB
138 kV
4+j30Q
B
Z1-BC
7+j60
A
Z1-BD
2+j20
中
Rab
Maximum load
120 MVA
Relays settings
Torque angle
CT ratio
0.2 to 10
75° or 80°
500:5
1150:1
VT ratio
Select one:
O a. 6.5 at 80°
O b. 4.5 at 80°
○ c.
8.5 at 80°
Od. 2.5 Q at 80°
中
Ribc
中
Rad
Transcribed Image Text:Consider the system below. Suppose relay Rab is a directional comparison blocking relay using directional mho relays for tripping and reversed mho relays, without offset, for blocking. If the carrier trip settings for the phase relay Rab is equal to 4.502 at 80° and line resistance is neglected, then the carrier start settings for the phase relay Rab would be equal to: VLL Z1-AB 138 kV 4+j30Q B Z1-BC 7+j60 A Z1-BD 2+j20 中 Rab Maximum load 120 MVA Relays settings Torque angle CT ratio 0.2 to 10 75° or 80° 500:5 1150:1 VT ratio Select one: O a. 6.5 at 80° O b. 4.5 at 80° ○ c. 8.5 at 80° Od. 2.5 Q at 80° 中 Ribc 中 Rad
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