FGYH series three-phase combined overvoltage protector

Product Introduction
The FGYH series three-phase combined composite jacket metal oxide lightning arrester is a new type of lightning arrester developed to address the weak inter phase overvoltage protection level of traditional lightning arresters. The product adopts a four-star structure, which can provide protection against phase to ground overvoltage and phase to phase overvoltage. It provides excellent protection against overvoltage caused by the interruption of vacuum circuit breakers and reignition overvoltage. Mainly used to protect electrical equipment such as transformers, switches, busbars, motors, etc., it can provide good protection against atmospheric overvoltage and operational overvoltage.

Conditions of Use

(1) Suitable for indoor and outdoor use;

(2) Environmental temperature: not lower than -40 ℃, not higher than+40 ℃;

(3) Altitude not exceeding 3000m;

(4) Grid frequency: 58-62Hz (60Hz system), 48-52Hz (50Hz system);

(5) The power frequency voltage applied between the terminals of the lightning arrester for a long time should not exceed the continuous operating voltage of the lightning arrester;

(6) Areas with seismic intensity of 7 degrees or below;

(7) The maximum wind speed shall not exceed 35m/s.

Product Selection

Preventive testing methods

Before the product is put into operationAnd every year during use, preventive tests should be conducted, with each test conducted separately-Xiang, Xiang-The experiment is conducted between every two units, using the following method:

（1）The preventive test method for three-phase composite jacket gapless metal oxide surge arrester is as follows:

a、direct-current1mAReference voltage test: Apply a DC voltage at both ends of the lightning arrester, and wait for the current flowing through the lightning arrester to stabilize at1mAAt this time, read out the voltage value, which should meet the specifications in the technical parameter table.

b、Leakage current test: Apply at both ends of the lightning arrester0.75Double direct current1mAThe reference voltage value should not exceed the current flowing through the lightning arrester at this time50μA.

c、Metal oxide surge arresters without gaps cannot undergo power frequency discharge voltage testing.

（2）Preventive Test Method for Metal Oxide Surge Arresters with Series Gap

a、Power frequency discharge voltage test: Connect a piece in series on the primary side of the test transformer10AAmpere meters above and above. During the experiment, voltage should be uniformly applied from zero, and the ammeter should be observed. When there is a sudden change in the ammeter, it indicates gap discharge, and the voltage value at this time is the power frequency discharge voltage value. After each discharge, it should be0.2SCut off the internal power supply. The interval between every two experiments shall not be less than10SThe number of measurements is3The average value of three times should comply with the specified values in the technical parameter table.

b、Conductance current test: Apply a direct current voltage at both ends of the lightning arrester, with the applied voltage value being the nominal system voltage of the lightning arrester. At this time, the current flowing through the lightning arrester should not exceed20μA.

c、Metal oxide surge arresters with series gap cannot be used for direct current1mAReference voltage test.

（3）It is strictly prohibited to conduct insulation withstand tests on lightning arresters. When conducting insulation withstand tests on other equipment in the system, the lightning arrester and equipment connection must be disconnected.

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