Answer / brd ganesh

Pilet wire method

Answer / william lobo

Line distance protection relay Siemens Energy
The SIPROTEC 4 7SA522 is a distance protection relay for
transmission lines. This relay provides full-scheme
distance protection and incorporates all functions usually
required for the protection of a power line. The relay is
designed to provide fast and selective fault clearance on
transmission and subtransmission cables and overhead lines
with or without series capacitor compensation. The power
system star point can be solid or resistance grounded
(earthed), resonant-earthed via Peterson coil or isolated.
The 7SA522 is suitable for single-pole and three-pole
tripping applications with and without tele (pilot)
protection schemes.

The 7SA522 incorporates several protective functions
usually required for transmission line protection.
• High-speed tripping time
• Suitable for cables and overhead lines with or without
series capacitor compensation
• Self-setting power swing detection for frequencies up to
7 Hz
• Digital relay-to-relay communication for two and three
terminal topologies
• Adaptive auto-reclosure (ADT)

One of the communication interfaces is system interface for
connecting to a control system via IEC 61850 Ethernet
protocol.

The basis on which voltage selection of motor is done i.e. either HT or LT.

1 Answers   DAE,

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i have flexible wire. size of conductors is 0.190 mm & no.of conductors are 48. then size of wire comes 1.37 sqmm instead of 1.5 sqmm . the what is tolerance for this size.

0 Answers  

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i want to make an elec generater with only 12v car battery car alternater and 12 volt motor ..... will the battery charge and give power at same time with out over charging the battery?

1 Answers  

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which %age if losses increases when frequency is increased to 25%

4 Answers   Maihar Cement, Siemens,

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what is basically a pulse transformer?

1 Answers  

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what is the different ratings of ACB/VCB/SF6 which is used at HT side

3 Answers   Hosco,

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is there any concept of armature reaction in Induction motor?

4 Answers  

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what is pressure relief valve in D.G ?state its function?

3 Answers  

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In short transmission line,why does the receiving end voltage is less than sending end voltage?

4 Answers  

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What is the gross weight to copper ratio in slip ring induction motor of 4000 HP,6.6 kv, 372amp, 992 rpm GE motor.

0 Answers  

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what is apparent poewr, reactive power, & active power?

0 Answers  

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How can we find out earth leakage,(shock)in side the house?.. (with out ELCB)

3 Answers  

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