# Insulation resistance of high voltage circuit breakers is more than?

Insulation resistance of high voltage circuit breakers is more than 100 mega ohms.

## Related questions

Answer : Meggar is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another.

Description : Write measures to be taken to maintain the insulation resistance of electrical machines to healthy levels.

Description : Name the method used to measure following resistances:- (i) Low resistance (ii) Medium resistance (iii) Insulation resistance (iv) Earth resistance.

Answer : Following are the methods used to measure resistances:-  (i) Low resistance: 1.Voltmeter-Ammeter Method 2. Kelvin's Double bridge Method  (ii) Medium resistance: 1.Voltmeter-Ammeter Method 2. ... of Charge Method  (iv) Earth resistance : 1. Fall of Potential Method 2. Earth tester

Description : If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be

Answer : If the insulation resistance of a cable of length 10 km is 1 mega ohm, its insulation resistance for 50 km length will be 0.2 mega ohm

Description : When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because  (A) Cables have a low value of capacitance which draws a high ... high value of charging current (D) Cables have a low value of capacitance and initial resistance

Answer : When measuring insulation resistance of cables using d.c. source, the galvanometer used should be initially short circuited because Cables have a high value of capacitance which draws a high value of charging current

Description : What is the lowest acceptable insulation resistance for a cable?

Description : What is an insulation resistance test?

Description : The thickness of insulation provided on the conductor depends on?

Answer : The thickness of insulation provided on the conductor depends on the magnitude of voltage on the conductor.

Description : The insulation on a current carrying conductor is provided?

Answer : The insulation on a current carrying conductor is provided to prevent leakage of current, to prevent shock.

Description : What do you mean by insulation coordination?

Description : What is double or reinforced insulation?

Description : What is basic insulation level?

Description : Which of the following circuit breakers has high reliability & minimum maintenance?  (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB

Answer : Which of the following circuit breakers has high reliability & minimum maintenance?  (A) Bulk oil type CB (B) Air blast CB (C) Vacuum CB (D) Sulphur hexafluoride CB

Description : Name two methods for measurement of low, medium and high resistance. Give one advantage and one limitation of V- I method.

Answer : Methods for measurement of low resistance:  1. Ammeter voltmeter method  2. Kelvin's bridge method  3. Ohm meter method  4. Potentiometer method  5. Digital/analog multi-meter ... must be infinity for perfectly accurate measurement which is not possible.  2. Connection errors.

Answer : For measuring a very high resistance we should use Meggar.

Description : The hot resistance of the bulb's filament is higher than its cold resistance because the temperature co-efficient of the filament is?

Answer : This  is  because  resistance  of  a  conductor  increases  with  increase  in  temperature .

Description : Define pinch off voltage and drain resistance of FET.

Answer : 1 . Pinch-off Voltage: It is the value of the drain to source voltage VDS at which the drain current ID reaches its constant saturation value. Any further increase in VDS does not have any ... drain to source voltage to the change in drain current. It is also called AC/dynamic drain resistance.

Description : A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he

Answer : A single phase transformer has resistance and reactance of 0.2 pu and 0.6 pu respectively. Its pu voltage regulation at 0.8 pf lagging would he 0.52

Description : A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is (A) 9997 Ω (B) 10000 Ω (C) 997 Ω (D) 10003 Ω

Answer : A moving coil meter has a resistance of 3 Ω and gives full scale deflection with 30 mA. To measure voltage up to 300 V, the external resistance to be connected in series with the instrument is 9997 Ω

Description : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms?

Answer : An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms, both resistance and inductance carry equal currents.

Description : A star circuit has element of resistance R/2. The equivalent delta elements will be?

Description : The resistance of a few meters of wire conductor in closed electrical circuit is?

Answer : The resistance of a few meters of wire conductor in closed electrical circuit is practically zero.

Description : The following is/are the characteristics of SF6 circuit breakers:  (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above

Answer : The following is/are the characteristics of SF6 circuit breakers:  (A) It does not need an auxiliary breaking chamber (B) Short break time of 2 to 2.5 cycles (C) All of the above (D) None of the above

Answer : Air blast circuit breakers for 400 kV power system are designed to operate in 50 millisecond.

Answer : The time of closing the cycle, in modern circuit breakers is 0.003 sec.

Description : The current zero interruption, in oil and air blast circuit breakers, is achieved by?

Answer : The current zero interruption, in oil and air blast circuit breakers, is achieved by lengthening of the gap, cooling and blast effect.

Answer : Circuit breakers are essentially current carrying contacts called electrodes.

Answer : Circuit breakers usually operate under transient state of short-circuit current.

Description : State the procedure for testing of earth pit resistance with necessary diagrams.

Answer : Following procedure (Method) for testing of earth pit resistance with necessary diagrams. 1) Earth Tester : i) Three point method ii) Four point method 2) By Potential drop method 3 ... of that earthing pit. In this test the accuracy is less but electrical rods are not required.

Description : State the impact of inductance and resistance on transmission line performance

Answer : Impact of inductance on transmission line: 1) It causes IXL drop in transmission line which affects regulation. 2) It is the only parameter which decides power transmission capacity of line i. ... is very small, it causes losses, temperature rise& poor voltage regulation so it cannot be neglected

Description : What do you mean by exciting resistance and exciting reactance?

Description : Resistance

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Description : what is equivalent resistance when four 4 Ohm resistors are connected in i) series ii) parallel

Description : role of the series resistance connected in PMMC movement.

Answer : A PMMC Instrument can be used as voltmeter by just connecting a series resistance with the moving coil. This series resistance is called Voltmeter Multiplier. This combination of moving coil and ... current whose voltage is to be measured. Ideally the resistance of voltmeter should be infinite

Description : Define resistance with its unit.

Answer : Resistance is a measure of the degree to which a substance impedes the flow of electric current induced by a voltage.  Or Resistance is the opposition to current flow in an electrical circuit. Unit is ohm.(Ω)

Description : List two advantages of platinum resistance thermometer.

Answer : 1. The platinum resistance thermometer is stable 2. It is resistant to corrosion 3. It is resistant to oxidation

Description : What is the mathematical relationship between resistance and conductance?

Description : How does the resistance of a conductor compare to that of an insulator?

Answer : The resistance of a conductor can be significantly lower than the resistance of an insulator, depending on each material's atomic properties.

Description : Resistance formula

Answer : The formula for resistance is, Where, R = resistance in Ohms ρ = resistivity in ohm - metre l = length A = cross sectional area

Description : Parallel Reactance and Resistance Example 1

Answer : Parallel Reactance and Resistance Example 1

Description : AC Circuits with Resistance but No Reactance

Answer : AC Circuits with Resistance but No Reactance AC Circuits with Resistance but No Reactance Series resistances let two resistances R 1 and R 2 are connected in series as shows in figure and there ... voltage. Voltage V A is common to both the branch hence voltage V A is common reference.

Description : Problems on resistance and resistivity

Answer : Problem on resistance and resistivity 1 : https://youtu.be/OqavD7OlZUs Problem on resistance and resistivity 2 : https://youtu.be/0eo8VO8cpwk Problem on resistance and resistivity 3 : https:// ... https://youtu.be/3neLRCTz0RQ Problem on resistance and resistivity 13 : https://youtu.be/vBCkvPOiztY

Description : Problem on temperature coefficient of resistance 3

Answer : Problem on temperature coefficient of resistance 3

Description : Problem on temperature coefficient of resistance 2

Answer : Problem on temperature coefficient of resistance 2

Description : Problem on temperature coefficient of resistance 1

Answer : Problem on temperature coefficient of resistance 1

Description : Problem on resistance and resistivity 13

Answer : Problem on resistance and resistivity 13

Description : Problem on resistance and resistivity 12

Answer : Problem on resistance and resistivity 12

Description : Problem on resistance and resistivity 11

Answer : Problem on resistance and resistivity 11

Description : Problem on resistance and resistivity 10

Answer : Problem on resistance and resistivity 10

Description : Problem on resistance and resistivity 9

Answer : Problem on resistance and resistivity 9

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