What is the normal range of the lightning arrester s leakage current

Under the normal rated power frequency voltage, the arrester can be regarded as an insulator, so considering the voltage fluctuation range, the index is set to be no greater than the leakage, in principle, the smaller the better. The leakage current can reflect the insulation of the arrester, which is an important means to judge the quality of the arrester under the operating voltage.

The lightning arrester can release lightning or release the overvoltage energy of the power system operation, protect the electrical equipment from the instantaneous overvoltage hazards, and can also intercept the intermittent flow without causing a short circuit in the system grounding. The arrester is usually connected between the live wire and the ground, in parallel with the protected equipment. When the overvoltage value reaches the specified operating voltage, the arrester will act immediately, flow through the charge, limit the overvoltage amplitude, and protect the equipment insulation; After the voltage value is normal, the arrester quickly returns to its original state to ensure the normal power supply of the system.

The HIOKI ST5520 can be tested from small currents to high currents, and has a wide range of measuring ranges to meet most of the test needs, and can export data for related analysis.

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The operator of a 220kV substation found the 4563 lightning arrester of the Yunxia line during the equipment inspection.

B-phase leakage ammeter.

The displayed value is large (A, B, and C, respectively.) 5ma）。The testers went to the site to inspect and found that the glass surface of the B phase leakage ammeter was worn and the readings were blurred.

However, after the new leakage ammeter readings stabilized, the data was the same as before the leakage ammeter was replaced.

2 Infrared temperature measurement of lightning arrester The results of infrared temperature measurement of this group of arresters show that the temperature difference between the middle flange of phase B arrester (divided into upper and lower sections) near the bottom porcelain sleeve of the upper section and the other two phases reaches 3 (phase A is 2131, phase b is 2498, C phase is 21

44℃）。The infrared thermal imaging characteristics of the arrester are: the overall slight heating under normal conditions.

The hot spots are generally close to the upper part and uneven, and the temperature of each section decreases from top to bottom in the multi-node combination. Global fever or localized fever is abnormal. According to Appendix B1. The criterion and thermal image characteristics preliminarily judge that the valve plate of the phase arrester is aged or damp, and the defect level is critical.

3. Arrester power failure test: The arrester is tested after the power is off. The arrester model is Y10W-204 532W, and the continuous operating voltage is 159kV. In order to facilitate data comparison, the upper section of phase A was also tested.

The trial data are shown in Table 1. As can be seen from Table 1, the DC and AC parameters of the upper section arrester of phase B deviate greatly from the normal values. Checking the historical test data of the arrester, the three-phase data of the handover test is normal, the latest power failure test data is also normal, and the latest live test data is balanced and normal.

In order to find out the cause of the arrester failure, it was decided to dismantle it.

4. Disintegration of the arrester Dismantle the upper part of phase B and open the explosion-proof membrane.

It was found that the inside of the explosion-proof film was dry and there was no dirt and no signs of moisture, and the source was sealed several times.

Intact and no anomalies found. Open the explosion-proof membrane at the bottom of the arrester, and find that the bottom seal ring is deformed and damaged (as shown in Figure 2), and the seal ring damage may be caused by negligent assembly slag cracking. Although the inside of the explosion-proof film is not wet, there is a dirt formed by moisture and powder together.

The indicator is set to be no more than 50 A at the bottom of the leakage, and in principle, the smaller the better, taking into account the range of voltage fluctuations. The leakage current can reflect the imitation insulation of the bent car of the arrester, which is an important means to judge the quality of the arrester under the operating voltage.

The current passing through the zinc oxide buried fiber resistor is called the leakage current of the zinc oxide arrester sail hail, which is also considered to be the total leakage current of the arrester. Under the normal rated power frequency voltage, the arrester can be regarded as an insulator.

There are many kinds of arresters, I don't know what you say, there are distribution type, power station type, capacitive type, motor type, railway type, DC type, line type, GIS type, oil type, etc., each type of protection level is different.

Introduction: Arresters are crucial in ensuring the proper operation of electrical equipment, but when the leakage current of arresters exceeds the standard, breakdown damage may occur. What is the leakage current of the arrester, and what are the reasons for the excessive leakage current of the arrester, this article will interpret it for you, and I hope to help my colleagues.

For professional power grid technicians, it can be said that it is a relatively common situation to encounter excessive leakage current of lightning arrester in their work. So what is lightning arrester leakage current? Arrester guess which hail leakage current exceeds the standard, what are the reasons for the exceedance, the following Tuba Rabbit will take you to learn together.

What is lightning arrester leakage current

Professionally speaking, the leakage current of the arrester refers to the current flowing through the arrester when it is working under the normal rated voltage. Generally speaking, the arrester can be regarded as an insulator under normal working conditions, and when there is no overcurrent voltage, the leakage current value of the arrester is very small, generally not exceeding 1mA. However, with the long-term work of the arrester, coupled with the influence of external factors, the performance of the valve inside the arrester will decrease, and the leakage current value of the arrester will become larger.

The leakage current of the arrester reflects the degree of insulation of the arrester to a certain extent, and it is also an extremely important aspect to judge the performance of the arrester under the voltage operating state.

What are the reasons for the excessive leakage current of the lightning arrester?

1. Temperature. The magnitude of temperature is one of the important factors affecting the leakage current of the arrester. When the temperature rises, the leakage current of the arrester increases.

When the temperature rises, the arrester can not dissipate heat in time, and the temperature of the resistor will increase, which will cause the resistive current of the arrester to increase.

2. Filth. Contamination on the outside of the arrester can affect the voltage distribution of the resistor column, resulting in an increase in the leakage current of the arrester.

High-voltage connection wires. As we all know, the arrester is installed on the high-voltage wire, when the field strength on the surface of the high-voltage wire is too high, the air of the high-voltage wire will be ionized, which further affects the leakage current of the arrester.

3. Humidity. The higher the humidity of the air, the higher the leakage current of the arrester, especially in rain and snow.

The harmonic content in the voltage at both ends of the arrester. The harmonic content in the voltage at both ends of the arrester can have an impact on the measured value of the leakage current of the arrester, especially when using leakage current measuring instruments manufactured according to the principle of harmonic method.

4. Uniform pressure ring spike sail. If the arrester is not installed with a equalizing ring, and the technician directly measures the leakage current of the arrester, the leakage current value of the arrester will generally be large.

There are many reasons for the excessive leakage current of the arrester, and the professional and technical personnel should diagnose it from both external and internal aspects, so as to determine the cause of the excessive leakage current of the arrester.

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It should be the discharge current or thunder clan land strike resistance, the bigger the better, the greater it means that the lightning arrester lightning current Cheng Chun Sui has a large capacity.

Arrester leakage current standard.

Hello, glad for your question. The leakage current of FCD arresters (conventional arresters) is not more than 2 milliamperes (mA), which is measured under the rated voltage of the bridge. According to national standards and industry norms, the leakage and rot balance flow of FCD arresters should be controlled within a certain range to ensure the stability and safety of operation.

At the same time, the leakage current of the arrester will also change with the passage of time, so regular detection and replacement of the arrester is also an important means to ensure the safe operation of the power grid. It is important to note that specific leakage current standards may vary depending on the requirements of different regions and different industries, and it is recommended to select and install according to local codes and standards. Have a great day!

Arrester leakage current standard.

Hello, the standards are as follows: The leakage current of the FCD arrester should be less than or equal to 10% of the rated discharge current. The leakage current of the FCD arrester should be less than the leakage current standard of the FCD arrester, which is the upper limit of the allowable leakage current of the arrester under normal working conditions.

Usually, this standard is determined by the manufacturer according to the design specifications and relevant national standards. In China, the leakage current standard for FCD arresters generally meets the requirements specified in the GB T 11032 standard. According to this standard, the leakage current of the FCD arrester should be less than or equal to 10% of the rated discharge current.

Therefore, in general, the leakage current of the FCD arrester should be less than 630A. It is important to note that leakage current standards may vary for different brands and models of FCD arresters, and the specific standards should be based on the product instructions or the information provided by the manufacturer. At the same time, in the actual application process, the arrester should also be regularly tested and maintained according to the actual situation of the site to ensure that it works safely and reliably.