NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–Noyafa Cable Tester
High-voltage bridge fault tester how to use high-voltage bridge fault tester manufacturer Shenzhen high-voltage bridge operation manual High-voltage bridge fault tester how to use high-voltage bridge fault tester manufacturer Shenzhen high-voltage bridge instruction manual Shenzhen bridge working principle random talk about the use of Shenzhen bridge<Baidu academic cable fault test method The smoothness of cable communication and power transmission depends on the operation of normal cable roads. Once the line is blocked, if the fault is not detected and eliminated in time, it will cause huge economic losses and adverse social impacts. Therefore, the cable fault detector is an important tool for maintaining various cables.
Cable fault intelligent tester is a comprehensive set of cable fault detection instruments. It can test high-resistance flashover fault, high- and low-resistance grounding, short circuit, cable disconnection, poor contact and other faults of cables. If equipped with a sonic law point instrument, the exact location of the fault point can be accurately determined.
It is especially suitable for testing power cables and communication cables of various types and voltage levels. The intelligent cable fault tester can test all kinds of power cables (voltage level 1kv-35kv), local telephone cables, frequency modulation communication cables, etc. Axle cables and metal overhead lines. It can test the length of the cable and the propagation speed of the electric wave on the cable.
Video: Use a double-arm bridge to measure the high-voltage resistance of the transformer and determine the fault range. The operation method of the bridge and the DC resistance tester is very simple and can be understood after reading the manual. The DC resistance data standard is shown in the table below. Those that do not meet the following standards can be transformer windings or terminals, etc.: 1) For transformers above 1.6mva, the difference between the winding resistances of each phase should not be greater than 2% of the three-phase average value.
For windings without neutral point, the line-to-line difference should not be greater than 1% of the average value of the three phases. 2) For transformers below 1.6mva, the phase-to-phase difference should not be greater than 4% of the three-phase average value, and the line-to-line difference should generally not be greater than 2% of the three-phase average value. 3) The change should not exceed 2% compared to the value previously measured at the same site.
The resistance values at different temperatures are converted as follows: R2=R1(T+T2)/(T+T1), where R1 and R2 are the resistance values at temperatures T1 and T2 respectively; T is the calculation constant, copper conductor 235, aluminum conductor 225 Shenzhen Noyafa Electronic Technology Co., Ltd. High-voltage bridge fault tester how to use the high-voltage bridge fault tester manufacturer Shenzhen high-voltage bridge instruction manual.
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