Surge arrester DC test system

Abstract

The invention discloses a lightning arrester direct current test system. The lightning arrester direct current test system mainly comprises a lightning arrester and a lightning arrester direct current test device, wherein the lightning arrester direct current test device comprises a current test device, a circuit test interface device and a circuit protection device. The lightning arrester direct current test device further comprises a capacitor set. By means of the lightning arrester direct current test system, suspension potential discharge between a lower segment bottom flange of the lightning arrester and the ground can be avoided.

Description

technical field [0001] The invention relates to the field of electric power applications, in particular to a DC test system for lightning arresters. Background technique [0002] At present, electric power workers often encounter the following problems when conducting preventive tests on surge arresters (for example, 220kV zinc oxide arresters) installed on power transmission equipment: zinc oxide arresters installed on lines or zinc oxide arresters installed at transformer outlets Due to limited conditions, especially the 220kV zinc oxide arrester installed on the line does not have the grounding opening condition after the primary lead is grounded. As a result, when testing such equipment, the lower section of the arrester can be tested normally, while the upper section can only be tested. It can be measured by the traditional high-voltage meter reading method. In this traditional measurement method, while the upper section adopts the high-voltage meter reading method, an ...

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Problems solved by technology

[0002] At present, electric power workers often encounter the following problems when conducting preventive tests on surge arresters (for example, 220kV zinc oxide arresters) installed on power transmission equipment: zinc oxide arresters installed on lines or zinc oxide arresters installed at transformer outlets Due to limited conditions, especially the 220kV zinc oxide arrester installed on the line does not have the grounding opening condition after the primary lead is grounded. As a result, when testing such equipment, the lower section of the arrester can be tested normally, while the upper section can only be tested. It can be measured by the traditional high-voltage meter reading method. In this traditional measurement method, while the upper section adopts the high-voltage meter reading method, an ammeter needs to be connected to the bottom of the lower section. Since the reading of the high-voltage meter reflects the total current, when needed When the DC reference voltage of the previous section is known, the ammeter reading of the next section must be subtracted from the total current. Only when the difference is exactly 1 mA can the DC reference voltage of the previous section be determined.

[0004] However, there is also a defect in this measurement method: during the DC high voltage test of the upper section, usually, when the measurement voltage has not been reached (when the upper section is measured, the bottom flange of the lower section of the arrester is suspended), the bottom flange The discharge has already started to the ground, and the discharge will be seriously aggravated as the voltage increases

Although this method has a good effect, due to the great limitations of using the capacitors of the other two unmeasured phase arresters, this method is very troublesome to operate and requires high technical personnel. Disadvantages of lower security and not conducive to standardizing the test site

[0006] Aiming at the problem of floating potential discharge that is easy to occur during the DC preventive test of the arrester in the related technology, no effective solution has been proposed so far

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