How to calculate the withstand voltage of the cable and how to get the withstand voltage value of th

According to the provisions of the electrical equipment test regulations, the power cable is only subject to the DC withstand voltage test.

And the leakage current test, these two tests are often carried out at the same time, as for the standard of the withstand voltage test you asked, it is different according to the different cable insulation materials, generally 1kv below the level of the cable can use up to 2500 shake meter.

Instead of withstand voltage test. The withstand voltage test voltage of the paper insulated 6kV 10kV cable is 40kV, while the withstand voltage test voltage of the rubber and plastic insulated 6kV 10kV cable is 25kv, and the above test lasts 1min

It is generally measured experimentally. If the theory is calculated, it is. Let the copper core voltage U, the inner diameter of the insulating skin R, the outer diameter R, and the outer surface be grounded, that is, 0V, so that the potential difference is U.

Check the permittivity of the insulating skin, then using Gauss's theorem in the presence of dielectric, the model is cylindrical, and the local maximum field strength e=u (r(lnr lnr)). You can calculate U by replacing this e with the breakdown field strength ek of the insulating skin material.

To sum up, the theoretical maximum withstand voltage value U=EKR(LNR-LNR). Ek is the breakdown field strength of the insulating skin, R is the inner diameter of the insulating skin, and R is the outer diameter of the insulating skin.

According to the provisions of the electrical equipment test regulations, the power cable only carries out the DC withstand voltage test and the leakage current test, these two tests are often carried out at the same time, as for the standard of the withstand voltage test you asked is different according to the different cable insulation materials, generally the cable of the following grade of 1kV can use up to 2500 shake meter instead of the withstand voltage test. The withstand voltage test voltage of the paper insulated 6kV 10kV cable is 40kV, while the withstand voltage test voltage of the rubber and plastic insulated 6kV 10kV cable is 25kv, and the above test lasts 1min

The withstand voltage of the cable cannot be calculated.

There is a voltage level.

There are only high and low voltage, below 1kV belongs to low-voltage cables, and above is high-voltage cables.

1. Variable frequency power supply: the power supply of 220V 380V and 50Hz is changed to adjustable frequency and continuously adjustable voltage, and at the same time integrates the functions of operation, protection, control and monitoring;

2. Excitation transformer: boost the voltage output of the variable frequency power supply, and isolate the high voltage and low voltage at the same time;

3. High-voltage reactor: series resonance with capacitive sample;

4. Voltage divider: measure the high-voltage voltage value and low-voltage on the regulator;

Cable withstand voltage test.

Mainly used for: High-voltage cross-linked cables.

AC withstand voltage test;

6kv-500kv transformer.

Power frequency withstand voltage test.

and SF6 switches.

AC withstand voltage test;

4.Dynamo.

AC withstand voltage test;

5.AC withstand voltage test of other power high-voltage equipment such as busbars, bushings, and transformers.

Cable withstand voltage test.

Principle: When the loop frequency f=1 2 lc, the loop resonates, and the voltage on the sample is q times the output voltage of the high-voltage terminal of the excitation transformer. q is the system quality factor, that is, the voltage resonance multiple, which is generally tens to more than 100.

First, the output frequency of the variable frequency power supply is adjusted to make the circuit resonate in series, and then the output voltage of the variable frequency power supply is adjusted under the condition of loop resonance to make the test voltage of the sample reach the test value. Due to the resonance of the loop, a smaller output voltage of the variable frequency power supply can produce a higher test voltage on the test CX.

The power cable is only tested for DC withstand voltage.

Test voltage: for kV cables, take 5 6 times the rated voltage.

For kV cables, take 4 to 5 times the rated voltage.

For cables above 35kV, take 3 times the rated voltage.

The withstand voltage value of the wire refers to the manufacturer's strict wire sheathHipot testThe resulting safety value can be used to work safely at the specified voltage.

A wire with a withstand voltage of 220 volts will be very unsafe when connected to a 380 volt voltage environment, which will cause the wire sheath to burn and life danger; It should not be connected to a 100,000-volt environment.

Voltage, also known as potential difference.

or potential difference, is a physical quantity that measures the energy difference between a unit charge in an electrostatic field due to different potentials. The magnitude of the voltage from one point to another is equal to the unit positive charge due to the electric field force.

The work done by the action to move from one point to another, the direction of the voltage is specified as the direction from the high potential to the low potential.

SI system of units for voltage.

It is volts (V, referred to as volts), and commonly used units include millivolts (mV), microvolts (V), kilovolts (kV), etc. This concept is similar to the water pressure caused by the water level. It should be pointed out that the term "voltage" is generally only used in electrical circuits, while "potential difference" and "potential difference" are generally applied to all electrical phenomena.

If the magnitude and direction of the voltage do not change with time, it is called a steady voltage or constant voltage, which is referred to as DC voltage, which is represented by the capital letter u. If the magnitude and direction of the voltage change over time, it is called a fluctuating voltage.

For circuit analysis, one of the most important fluctuating voltages is the sinusoidal alternating current voltage (abbreviated as alternating voltage), which changes periodically in magnitude and direction according to the sinusoidal law over time. The instantaneous value of the AC voltage is indicated by the lowercase letters u or u(t). The device that provides voltage in a circuit is a power supply.

The withstand voltage value of wires and cables is given by the corresponding manufacturing standard! The withstand voltage value refers to the withstand voltage value of the wire insulation skin, when the voltage is higher than a certain value, the wire skin will be broken down (the wire skin is also electrified), and it will not play an insulating role.

When the current is too large, the switches, plugs, etc. will become hot, and it is not safe, so it is necessary to limit the rated current.

The withstand voltage value of wires and cables is given by the corresponding manufacturing standard!

The withstand voltage value seen by the landlord is actually the rated working voltage, and the actual detected voltage is 10 times higher than this, and the time also varies with the different detection methods (there are more than 1 5 minutes.

Cable withstand voltage test standard.

Working power supply: 220V 380V, 50Hz

Test capacity: 30-30000kva

Test voltage: 1000kv and below.

Resonant frequency range: 20-300Hz

Test voltage waveform: the distortion rate of the sine wave waveform is less than or equal to.

Test voltage cooling accuracy: level 1.

Frequency Regulation: Protection Response Time: <1ms

At the same time, it is also necessary to register, and the test system used for cable withstand voltage should have overvoltage protection, overcurrent protection, discharge protection, breakdown trip protection, overheat protection, etc., and perfect electrical protection.

The voltage rating of the cable is the voltage level.

There are 450 750V and 6 6kV and 110kV and 500kV only high and low voltage, 1 kV or more belongs to the low-voltage cable, and the above is a high-voltage cable.

Hello, the voltage level of the cable is the voltage level, and 450, 750V and 6, 6kV and 110kV and 500kv, only high and low voltage, 1kV or more belongs to the low-voltage cable, and the above is the high-voltage cable.

Low-voltage (for 400 systems) cable 1000V.

3 minutes for 10kV cable withstand voltage preventive test, DC 35kv, 15 minutes for completed withstand voltage test, DC cable withstand voltage test: AC voltage is times of the rated voltage, and the time is 1 minute; The DC voltage is 4 times the rated voltage, and the time is also 1 minute.

The AC power frequency withstand voltage test is a destructive test, which may produce irreversible deformation to the experimental object, so there is a tendency to replace AC with DC, but the current common practice is to do both AC and DC withstand voltage. According to the standard, the test voltage is determined to be 5min (hour).

Wire ampacity.

The strength of the current carried by the conductor in amperes (a). In power engineering, the current carrying capacity of the wire is determined by three factors: the wire material, the cross-sectional area of the wire (per square millimeter, referred to as squared), and the wire laying conditions. Generally speaking, a single wire can have a higher current carrying capacity than multiple parallel wires; The open wire laying wire can take a higher current carrying capacity than the wire laid through the pipe; Copper conductors can have a higher ampacarrying capacity than aluminum conductors.

According to the provisions of the electrical equipment test regulations, the power cable only carries out the DC withstand voltage test and the leakage current test, these two tests are often carried out at the same time, as for the standard of the withstand voltage test you asked is different according to the different cable insulation materials, generally the cable of the following grade of 1kV can use up to 2500 shake meter instead of the withstand voltage test. The withstand voltage test voltage of the paper insulated 6kV 10kV cable is 40kV, while the withstand voltage test voltage of the rubber and plastic insulated 6kV 10kV cable is 25kv, and the above test lasts 1min

The power cable is only tested for DC withstand voltage.

Test voltage: for kV cables, take 5 6 times the rated voltage.

For kV cables, take 4 to 5 times the rated voltage.

For cables above 35kV, take 3 times the rated voltage.

Generally, the cable is not marked with the withstand voltage value, but the maximum working voltage and the maximum working temperature, and the actual withstand voltage value is much higher than it.

If it is clearly marked with "withstand voltage value: how much, how much", then it is how much.

Determination of withstand voltage value: the high voltage output of the test device is connected to the core of the tested wire (other grounding) for a certain period of time (usually one minute), and it is qualified without breakdown.

How is the cable withstand voltage grade coarsely eliminated and expressed rock staring?

What does YJV3*185+2*95 mean with 1kv in cable?

It is the withstand voltage level of this cable and its voltage operating range.

It represents the frontal back-sensitive voltage of the electric cable.

You can simply think of u0 as the phase voltage and u as the line voltage. The relationship between u0 and u and the power system.

When the center point is directly grounded, u= 3 u0, u0 is actually the phase voltage, but according to the different grounding methods of the system, the u0 value of the cable is different when selecting the cable.

It is the withstand voltage level of this cable and its voltage working range.