Overhead line integrated tester

Abstract

The invention relates to an overhead line integrated tester. The overhead line integrated tester comprises a working mode selection module which is connected with a constant current source module, a constant voltage source module and an induction voltmeter module, wherein the constant current source module is connected with a control module 1; the constant voltage source module and the induction voltmeter module are connected with a control module 2; the control module 1 and the control module 2 are connected with a connection terminal; the connection terminal is connected with a signal acquisition module 1 and a signal acquisition module 2; the signal acquisition module 1 and the signal acquisition module 2 are connected with an analog-to-digital conversion module; and the analog-to-digital conversion module is connected with a display module. Through integration of multiple functions, an instrument is integrated with overhead line induction voltage measurement, DC resistance measurement, insulation resistance measurement and nuclear phase functions; the test flow is simplified; and the working efficiency is improved.

Description

technical field [0001] The invention relates to a power line tester, in particular to a comprehensive tester for overhead lines. Background technique [0002] After the construction of the line, phase verification of the line is required, and before the new line is put into operation, tests such as phase verification, insulation resistance, induced voltage and DC resistance are required. The line phase verification test is to check whether the phase sequence and phase at both ends of the line are corresponding; the line insulation resistance test is to check the insulation level of the line between phases, the line and the tower, and the line to the ground; the induced voltage test is to measure the line. Induced voltage; line DC resistance test is to check whether there are faults or hidden dangers such as short circuit and poor contact. These four tests are very important for the safe and stable operation of overhead lines. [0003] However, there are some problems with t...

AI Technical Summary

Problems solved by technology

[0004] First, the four tests need to replace the test equipment three times, and the test wiring needs to be changed three times, which is very cumbersome and inconvenient

[0005] Second, due to frequent replacement of test wiring and test instruments, it will cause great safety hazards to test personnel

First of all, for phase verification and insulation resistance measurement, firstly, the overhead line is a capacitive device, and the direct current generated by the insulation resistance meter will store a large amount of charge on the capacitive device; secondly, the adjacent line near the power-off line structure If there is no power outage, or if there is no power outage on the line with the same tower structure, it will cause sudden induced voltage to hurt people, especially when the test is carried out on lines above 220kV, the induced voltage is very obvious and has a lot of energy

For the DC resistance measurement of overhead lines, since the wiring needs to be replaced three times, there is a potential danger of inductive electric injury every time the wiring is replaced, and such accidents in the power grid have always emerged in endlessly; and the test data still needs to be processed manually. low, poor accuracy

[0006] In order to avoid the residual charge and induced voltage from hurting people, the traditional method is to discharge the leads of the three-phase line separately after each test is completed, and the direct contact of personnel with a large amount of residual charge and potential induced voltage will inevitably increase the potential Risk, a little carelessness in the operation may cause a safety accident, and if the adjacent interval of the test line or the line suddenly fluctuates in current and voltage after discharge, a new induction current will be generated instantaneously, and this uncertainty is even greater. is an increased risk to workers

Images