Lead wire clamp for simultaneous detection of three phases of lightning arrester

Abstract

The invention discloses a lead wire clamp for simultaneous detection of the three phases of a lightning arrester. A groove-shaped slide channel is arranged on a carriage. An upper jaw and a fixed pulley are coaxially fixed at the upper end of the carriage. A lower jaw is coaxial with a movable pulley, and is driven by the movable pulley to move up and down along the slide channel. The lower end of the carriage is connected with a control bar. The control bar is formed by two member bars which one is sleeved by the other. An inner chamber of the inner control bar is communicated with the groove-shaped slide channel of the carriage, and provided with a connection block. The lower end of the connection block is connected with a connection bar which is connected with the outer control bar. The upper end of the connection block is connection with a steel wire rope, and the steel wire rope bypasses the fixed pulley to be connected with the movable pulley. By using the clamp provided by the invention, the three phases can be detected at the same time, such that the procedures of frequent hanging and fetching of the test lead wire by test personnel clamping the insulating ladder are completely eliminated, and the test can be conducted on the ground, thereby greatly improving the working efficiency and increasing the safety coefficient of the live test of the lightning arrester.

Description

technical field [0001] The invention relates to a fixture for detecting a lightning arrester, in particular to a fixture for simultaneously testing lead wires of three phases of a lightning arrester. [0002] Background technique [0003] The total leakage current flowing through the zinc oxide arrester under AC voltage includes resistive current and capacitive current. The well-insulated zinc oxide surge arrester has a very small AC leakage current under normal operating voltage, and it is mainly capacitive current, with only a small part of resistive current. But when its insulation deteriorates, the resistive component will increase a lot, and the capacitive component will not change much. Therefore, measuring the leakage current of the zinc oxide arrester under the operating voltage, especially the resistive current is an important means to judge the operation status of the arrester, and it is of great significance to ensure the safe operation of the equ...

AI Technical Summary

Problems solved by technology

The main defect of this method is: many lightning arrester leakage current on-line monitors are installed at a relatively high location, and testers need to frequently use insulating ladders to climb up and hang and take test leads, which is not only time-consuming but also has certain safety hazards; and must be tested phase by phase , the single-phase test method cannot overcome the interference of adjacent arresters, which often leads to inaccurate test results

Images