Author: Noyafa–Noyafa Cable Tester
How to use the buried cable fault tester What are the operating steps of the cable fault tester? The basic test steps of the cable fault tester are as follows: (1) Find out the cause of the fault and the basic conditions of the cable, such as whether there is a fault in the trial operation or the operation steps of how to use the cable fault tester. what is it? The basic test steps of the cable fault tester are as follows: (1) Find out the cause of the fault and the basic conditions of the cable, such as whether there is a fault or a fault in the trial operation, a new cable or a long-running cable, and the approximate length of the cable , Whether there is a joint in the middle of the cable, whether the cable has failed before, whether the cable is directly buried or laid in the cable groove, the type of the cable, etc. (2) Both ends of the cable must be disconnected from other lines to ensure that the cable has no power. The environment around the cable is in a safe state.
(3) Before connecting the cable, the tester must pay attention that each phase wire of the cable is connected to the ground with a short wire, and one end of the short cable must be grounded, and the other end must be connected to the discharge of each phase wire of the cable respectively. Other electrical appliances such as capacitors, test transformers, etc., should be discharged before wiring. In short, to develop the habit of operation, before each operation, pay attention to the operation and circuit connection of the electrical appliance, put it first, and then operate it.
(4) During the test, first use the low-voltage pulse function of the flash meter to test the full length of each phase of the cable to see if the waveforms of the three-phase armoring test are consistent; for most high-resistance faults, the test waveforms of each phase are consistent. For low-resistance faults and high-blocking phase faults, the fault phase test waveform is inconsistent with the full length of the cable under test, and low-voltage pulses can be used to directly measure the fault distance. (5) When the high-voltage flashover method is used for the test, no matter whether the cable fault is a high-resistance fault or a low-resistance fault; the high-voltage flashover method can be used for testing; for low-resistance or disconnection faults that can directly test the fault distance with low-voltage pulses , high-voltage flashover is generally required to verify the test and locate the fault point. (6) After the high-voltage flashover method test is completed, the fault can be located by determining the fault distance.
When using the acousto-magnetic synchronous locator, fault localization and path detection can be performed simultaneously. How to use the buried cable fault tester Shenzhen Noyafa Electronic Technology Co., Ltd.
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