Interested to Buy Any Domain ? << Click Here >> for more details...
how to check IR values in alternator winding?
- 3 Answers
- 16786 Views
- Birla, Naftogaz, I also Faced
- E-Mail Answers
Answer Posted / subash
A. Purpose and Theory
The IR test measures the resistance of the electrical
insulation between the copper conductors and the core of
the stator or the rotor. Ideally this resistance is
infinite, since after all, the purpose of the insulation is
to block current flow between the copper and the core. In
practice, the IR is not infinitely high. Usually, the lower
the insulation resistance, the more likely it is that there
is a problem with the insulation.
PI is a variation of the IR test. PI is the ratio of the IR
measured after voltage has been applied for 10 minutes
(R10) to the IR measured after one minute (R1), i.e.:
PI = R10/R1
A low PI indicates that a winding may be contaminated with
oil, dirt, insects, etc. or soaked with water. In the test,
a relatively high DC voltage is applied between the winding
copper and the stator or rotor core (usually via the
machine frame). The current flowing in the circuit is then
measured
| Is This Answer Correct ? | 7 Yes | 1 No |
Post New Answer View All Answers
What is the basic principle of operation of alternators/dc generators?
How to calculate the efficiency of Turbo Generator(Alternator) in general....?
a)In a 3-phase 4-wire circuit, a circuit breaker is selected to protect the circuit whose highest fault level is 6.6 MVA. Determine the required minimum breaking capacity in kA. (Note: Covert 3-phase power in terms of kA to find answer.) b)Using the below, determine the required minimum making capacity in kA as a “peak value”. Rate breaking capacity (Icn) ka: Icn<= 1.5 Factor = 1.41 1.5
i want wipro vlsi placement pattern please send me
how the CT and PT is connected in the circuit during testing of transformer explain with diagram
What is T’Q and X’Q and X’D ? and what is saturated as well as unsaturated ?
How to determine the breaking capacity such as break down current and break down voltage for VCB and CT's.
write a program that prints prime numbers from 1-20 in digonal form
Is there any reason that we get shock on touching phase wire because the earth is at neutral potential? Is there any reason that the earth is at neutral potential because the neutral is earthed in apower station
How to Decide(calculate) Bush bar size for copper and aluminiam ?
Write a note on Treatment for electric shock.
Hi Suppose we have a wye/wye transformer which is grounded at both sides,in this situation, do we have ay ground transformer? in other words, ground transformer can do any thing more (while we have nuetral wire in both sides)? As the last question, what about 3rd harmonic? we have two choices: first using wye/delta transformer + ground transformer and second using wye/wye earthed connection.in the former choice, we dont have 3rd harmoonic at the secondary side but what about Yn/yn conection? do we suffer from 3rd harmonic in the Yn/yn connection?
EXPLAIN WHY THE SURGE CURRENT RATING OF AN MCCB OR CIRCUIT BREAKER DECREASES WITH INCREASE IN THE RATING OF MCCB OR CIRCUIT BREAKER.
If Neutral Grounding Resistor (GR) failed/shorted. Is it repairable.
1.4 What is meant by CT knee point voltage and how would you determine it
