The circuit breaker characteristic tester is a device used to test and diagnose the performance of circuit breakers in high-voltage power systems. Circuit breakers are common protective devices in the power system, used to isolate faults and maintain equipment. Therefore, it is necessary to ensure their normal operation and timely…

At present, most circuit resistance testers on the market use a typical four wire measurement method, where a high-frequency switching power supply provides a test current greater than 100A. When the measurement button is pressed, the high-frequency switching power supply outputs a test current greater than 100A. At the same…

The grounding grid continuity tester is an instrument used to detect the continuity and grounding resistance of the grounding grid. The high current method and the frequency difference method are two commonly used testing methods, which differ in principle, scope of application, and test results.1. High current method (also known…

The grounding down lead continuity tester is a device used to test the grounding system, which can detect the grounding continuity in the system. Its working principle and characteristics are as follows:Working principle:The tester is connected to the grounding point of the device to be tested through a grounding down…

SF6 gas leak detector is a new generation of fully automatic intelligent leak detector, which is a stable and sensitive leak detector. The high-tech central microprocessor unit is the core of the SF6 leak detector, and its digital signal processing capability can better manage circuits and process detection signals. Due…

Purpose of testing transformer DC resistance:1. Check the welding quality of the winding joints and whether there is a turn to turn short circuit in the winding;2. Check whether the contact between each position of the on-load tap changer is good, and whether the actual position of the tap changer…

1. SecurityThe most important reason for conducting insulation testing is to ensure public and personal safety. By conducting insulation tests on disconnected current carrying conductors, grounding conductors, and waiting to be grounded conductors, the possibility of fire caused by short circuits can be eliminated.2. Extend equipment lifeInsulation testing is also…

In recent years, the incidence of electrical fires has always accounted for about 21% of the total number of fires, and the causes of electrical fires include equipment aging, short circuits, overload, poor contact, etc. Among them, electrical equipment aging is the main culprit. Therefore, in order to keep electrical…

The AC/DC voltage divider is used in power systems and electrical and electronic equipment manufacturing departments to measure power frequency AC high voltage and DC high voltage. It is a high voltage measurement device with impedance capacitance equipotential shielding and voltage divider. Mainly used for measuring pulse high voltage, lightning…

1、 The reasons for the increase in no-load loss and no-load current of transformers include:① Poor insulation between silicon steel sheets.② There is a short circuit between a certain part of the silicon steel sheet in the magnetic circuit.③ The insulation of the core bolts or pressure plates, upper yoke…