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What is the purpose of stablization resistor in high impedance bus bar protection
Electrical Engineering 1945What is purpose of reactor?.What is different between line and bus reactor?
Electrical Engineering 1893During Load testing of battery charger with temporary AC Generator .When reach 70% load Generator immediately shutdown .we could not able to Recognize ,what is exactly problem .Please kindly clarify us
1 Electrical Engineering 3085what is the purpose of high speed earth switch in gas insulated substat
ABB,
Electrical Engineering 2932What is different between Difnit time and instatous over current relay
NCC,
Electrical Engineering 2463Can you any explain about active,reactive and apparent power in power system with example.
1 Electrical Engineering 2695
Question { Sarhad University, 28286 }
why we step up voltage for reducing the loss, even if
voltage and current are proportional anr resistance remains
same
Answer
in my point view
for high current and low voltage transmission
1.AC current flow outermost conducter in grid bus,so
loss of skin effect more is one the factor
2.Current carring capacity is high,so it is need spical
type bushing and transmission tower,in bteween lines need
more support.it is diffecult maintance
| Is This Answer Correct ? | 4 Yes | 5 No |
Question { 9390 }
why we used to transmitt the power at higher voltage why
not at lower voltage
Answer
1.Reducing line loss(I^2 R)
2.Improve efficiency
3.Save Material Cost
| Is This Answer Correct ? | 2 Yes | 0 No |
what is the difference between the 94 lockout relay and 86
lock out relay. I have noticed that the 94 lockout relay is
activated when the distance realy is activated and 86 is
activated when the 87T differential is activated. but why
can't the same lockouts be used for both the protection
schemes
Answer
protection (permanent fault) & 94 lockout relay is self
reset used for tranisent fault (temprovery fault condition)
this is major different between 86 and 96 lockout relay
| Is This Answer Correct ? | 39 Yes | 22 No |
Question { 25078 }
What is the expansion valve in HVAC & How it
works ????????????
Answer
it normally used maintance used maintance tempearure level
inside the building
| Is This Answer Correct ? | 28 Yes | 75 No |
Question { Bureau Veritas, 6453 }
What may be happen if neutral and earth is shorted in a
substation
Answer
| Is This Answer Correct ? | 6 Yes | 2 No |
What is difference between MCB,MCCB,ELCB and RCCB?
Brief description and why RCCB is costly?
Answer
MCCB moulded case circuit breaker and is thermal operated for over load current and magnetic operation for instant trip in short circuit condition,Normally it is used where normal current is more than 100A.
RCCB is used to detect earth leakage fault.once there is a ground fault in the load side,current from phase will directly pass through earth and it will not return through netural through RCCB,that means one side current is going and not returning and hence beacuse of this difference in current RCCB will trip and it will safe guard the other circuits for fault loads,that why cost of RCCB also costly
| Is This Answer Correct ? | 3 Yes | 0 No |
Question { 3955 }
Why we apply 100ADC for contact resistance measurement?.If we apply AC what will happen
Answer
| Is This Answer Correct ? | 0 Yes | 0 No |
Question { 3955 }
Why we apply 100ADC for contact resistance measurement?.If we apply AC what will happen
Answer
| Is This Answer Correct ? | 0 Yes | 0 No |
