How many megaohms is the insulation resistance of a 10kv high voltage cable qualified?

10kV with a length of 500m and below

Power cables. with 2500v

Megohmmeter. Shake test, when the cable temperature is +20, its.

Insulation resistance. The value should not be less than 400m

The insulation resistance of a good (good) power cable is usually very high, and the lowest value can be specified by the manufacturer: new cable, insulation resistance of the outer skin of each core (resistance value per kilometer at 20), rated voltage.

6kV and above should not be less than 100m, and the rated voltage of 1 3kv should not be less than 50m.

Extended Materials. Insulation resistance.

Correct measurement of insulation resistance.

Modern life is changing with each passing day, and people can't do without electricity for a moment. There is an electrical safety problem in the process of using electricity, in electrical equipment, such as motors, cables, household appliances, etc.

The DC resistance of an insulator under specified conditions.

Insulation resistance is the most basic insulation index of electrical equipment and electrical circuits.

For the handover test of low-voltage electrical installations, the insulation resistance of motors, distribution equipment and distribution lines at room temperature should not be lower than that of equipment and lines in operation, and the insulation resistance should not be less than 1m kv).

Low-voltage appliances. and its connecting cables and secondary circuits.

The insulation resistance should generally not be less than 1m; In a more humid environment should not be lower; The insulation resistance of the secondary circuit small bus should not be less than 10m.

The insulation resistance of Class I handheld power tools should not be less than 2m.

Insulation resistance: DC voltage is applied to the dielectric.

After a certain period of time after the polarization process ends, the leakage current that flows through the dielectric.

For a 10kV power cable with a length of 500m, measured with a 2500V megaohmmeter, the insulation resistance value should not be 400m when the cable temperature is +20.

The value of the insulation resistance of the cable varies with the temperature and length of the cable.

Extended Information: Insulation Resistance (insulation

resistance): The DC resistance of an insulator under specified conditions.

Insulation resistance is the most basic insulation index of electrical equipment and electrical circuits. For the handover test of low-voltage electrical installations, the insulation resistance of motors, distribution equipment and distribution lines at room temperature should not be lower than that of equipment and lines in operation, and the insulation resistance should not be less than 1m kv). The insulation resistance of low-voltage electrical appliances and their connecting cables and secondary circuits should generally not be less than 1m; In a more humid environment should not be lower; The insulation resistance of the secondary circuit small bus should not be less than 10m.

The insulation resistance of Class I handheld power tools should not be less than 2m.

Insulation resistance: The resistance corresponding to the leakage current flowing through the dielectric after a certain period of polarization process is called insulation resistance.

A 10kV cable insulation resistance of 400m is standard.

If the 10kV cable is 500 meters long and less than 500 meters, a 2,500 volt megohmmeter is used to shake the measurement, and when the cable temperature is 20 degrees Celsius, its insulation resistance value should not be less than 400m. In addition, its insulation resistance value will change according to the degree of heat and cold and the length of the cable. Suspicion.

Cable insulation resistance value standard:

1.In the case of a 1kV cable, its insulation resistance value should not be less than 10 megaohms.

2.If it is a 1-3kV cable, the insulation resistance value should not be less than 200 megaohms.

3.If it is a cable of 6-10kV, the standard for its insulation resistance value should be greater than 400 megaohms.

4.If it is a 20-35kV cable, the required insulation resistance value standard cannot be less than 600 megaohms.

5.If it is a 220kV cable, the standard in terms of insulation resistance value is higher, and it cannot be less than 4500 megaohms.

Precautions for measuring insulation resistance:

1.Insulation resistance tester can be used to measure insulation resistance, which is a special equipment, the total power supply must be cut off before measurement, and the short-circuit discharge to the ground must be carried out while disconnecting the power supply, so as to avoid the situation of live measurement, otherwise there will be potential safety hazards.

2.At the same time, it is necessary to check the presence of high-voltage equipment, and if it is detected, it must be eliminated before measurement. The surface of the measured object should be cleaned, so as to avoid the existence of some substances that affect the resistance value, so as to ensure the accuracy after the measurement. <>

The insulation resistance value of 220V household wire should be greater than.

If it is some power distribution equipment, then its insulation resistance is relatively high, at least not lower, if these equipment is in operation, then its insulation resistance value is higher. In short, this insulation resistance is very important, if the resistance value does not meet the requirements, it is easy to cause leakage and short circuit of electrical appliances.

Precautions for the use of insulation resistance meters

1. The measurement of insulation resistance must be carried out in the state of electrical equipment or electrical lines being de-energized, especially the equipment with large capacitance, which can only be measured after complete discharge to avoid electric shock.

2. In order to get accurate measurement results, the hand-cranked generator should work at the rated speed for one minute before reading.

3. Before the insulation resistance meter has not stopped rotating and the measured object has not been discharged, it is not allowed to touch the measurement part of the measured object with your hands, especially when the equipment with large capacitance is tested, the measured object must be short-circuited to the ground for short circuit discharge, and then stop rotating the insulation resistance meter to prevent the capacitor discharge from damaging the insulation resistance meter.

The above content refers to Encyclopedia - Insulation Resistance.

How many megaohms is the insulation of 10kv high voltage cable? Hello dear, the length of 500m and below 10kV power cable, with 2500V megohmmeter shake test, when the cable temperature is +20, its insulation resistance value should not be less than 400m. The resistance of high-voltage cables is more than 3 trillion ohms to be considered well insulated, and the insulation resistance of low-voltage electrical appliances, such as electric front pickers and wires in buildings, is qualified above.

I hope I will be helpful to you, thank you, and I wish you a happy life!

What is the insulation resistance value of high-voltage cable to be qualified? Hello dear, the insulation resistance value of high-voltage cable, 10kV with a length of 500m and below, with 2500V shake measurement, when the cable temperature is +20, its value should not be less than 400m. The value of the cable varies with the temperature and length of the cable.

For the convenience of comparison, it should be converted to 20 hour value, which is generally expressed as the resistance value per kilometer, that is: R20 RT KT L formula where R20 is at 20, m km per kilometer of cable; Insulation resistance of a cable with length l at t, m ; l Cable length, km; kt coarse, 20 coefficient. A good (good) insulation resistance is usually very high, and the minimum value can be specified in the following:

For new cables, the insulation resistance of each cable core (resistance value per kilometer at 20 hours) should not be less than 100m for 6kV and above, and not less than 50m for 1 3kv. Attached: Temperature of the cable:

The standard insulation resistance is 1 megaohm, and in humid areas it is greater than megaohms.

1. Requirements under various conditions:

1. Insulation resistance: Insulation resistance is the most basic insulation index of electrical equipment and electrical circuits. For the handover test of low-voltage electrical installations, the insulation resistance of motors, distribution equipment and distribution lines at room temperature should not be lower than that of equipment and lines in operation.

2. The insulation resistance should not be less than 1m kv), and the insulation resistance of low-voltage electrical appliances and their connecting cables and secondary circuits should generally not be less than 1m; In a more humid environment should not be lower; The insulation resistance of the secondary circuit small bus should not be less than 10m. The insulation resistance of hand-held power tools should not be less than 2m.

Second, the characteristics of the insulation resistance of low-voltage cables.

1. The insulation resistance value of general materials decreases with the increase of ambient temperature and humidity. Comparatively, surface resistance (rate) is sensitive to ambient humidity, while bulk resistance (rate) is sensitive to temperature. As the humidity increases, the surface leakage increases, and the conductor conductance current increases.

2. As the temperature increases, the velocity of the carriers accelerates, and the absorption current and conductivity current of the dielectric material will increase accordingly, according to relevant data reports, the resistance value of the general medium at 70 is only 10% of 20. Therefore, when measuring insulation resistance, it is necessary to indicate the temperature and humidity at which the specimen is in equilibrium with the environment.

3. Test time: When pressurizing the tested material with a certain DC voltage, the current on the tested material does not reach a stable value instantaneously, but has an attenuation process. At the same time as the pressurization, a large charging current flows, followed by a slowly decreasing absorption current over a longer period of time, and finally a relatively stable conductance current is reached.

4. The higher the measured resistance value, the longer the time to reach equilibrium. Therefore, in order to accurately read the measured resistance value during measurement, the value should be read after stabilization. In the test method of insulation resistance of communication cables, it is stipulated that the measured value of the insulation of the cable is the reading after 1 minute of charging.

5. But in fact, this method is a bit inappropriate, because when the DC voltage pressurizes the tested material, the current on the tested material is the capacitance current, since it is the capacitance current, it is related to the capacitance size of the cable, and the capacitance needs to be charged for a long time.

6. Therefore, the same type of cable, due to the different lengths and capacitors, the reading when the charging time is one minute is obviously unscientific, and further research is needed.

For 10kV power cables with a length of 500m and below, the insulation resistance value should not be less than 400m when the cable temperature is +20

The value of the insulation resistance of the cable varies with the temperature and length of the cable. For comparison, it should be converted to the resistance value per unit length at 20, which is generally expressed as the resistance value per kilometer, i.e.,

r20＝rt×kt×l

where r20 is at 20, the insulation resistance of the cable per kilometer. mω/km；

Insulation resistance of a cable with length l at t, m ;

l Cable length, km;

kt temperature coefficient at 20 is .

The insulation resistance of a good (qualified) power cable is usually very high, and its minimum value can be specified by the manufacturer: for new cables, the insulation resistance of each cable core (resistance value per kilometer at 20 hours), the rated voltage of 6kV and above should not be less than 100m, and the rated voltage of 1 3kv should not be less than 50m

Attached: The temperature coefficient of the cable.

Temperature: 0 5 10 15 20 25 30 35 40

kt ：

Answer: Hello, dear, 10kV cable is 500 meters long and less than 500 meters, using a 2,500 volt megohmmeter to shake the measurement, when the cable temperature is 20 degrees Celsius, its insulation resistance value can not be 400 megaohms.