Technical Guide
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The purpose of the AC withstand voltage test and the requirements of the test procedures
The purpose of the AC withstand voltage test The AC withstand voltage test is the most effective and direct method for evaluating the insulation strength of power equipment. During the operation of power equipment, the insulation is constantly subjected to the effects of electric fields, tempera...Read more -
Three types of partial discharges in the tests of high-voltage electrical equipment
Partial discharge is a phenomenon where local and repetitive breakdown and extinction occur within the insulation of electrical equipment under certain applied voltages due to weaknesses existing within the insulation. As local partial discharge occurs within the insulation, it will be accompanie...Read more -
High-voltage switch mechanical characteristic tester method for measuring closing and opening time
Test of closing and opening times for the high-voltage switch mechanical characteristic tester Method 1: Internal DC power supply control The secondary circuit control power supply must be disconnected to prevent conflicts between the two power sources. Then, reconnect the above +, + closing, a...Read more -
Series resonance withstand voltage equipment for AC withstand voltage test of windings
Performing power frequency AC withstand voltage test on transformer windings using series resonance withstand voltage equipment Operating Steps 1. Select a power source of the same voltage level according to the requirements of the series resonance withstand voltage equipment. 2. Connect the te...Read more -
Measurement procedures for insulation resistance and usage methods of digital megohmmeters
Measurement steps for insulation resistance: Measurement preparation work When the object under test is connected to a power source, it should be stopped from operating before measurement. The power supply should be cut off. It is strictly prohibited to conduct the test while the object is energ...Read more -
Requirements and Precautions for Measuring DC Resistance of Transformer Windings
Based on the calculated values of the winding resistance in the product technical data, select a DC resistance tester or a dedicated bridge (with a precision no less than 0.2 grade) appropriately; the requirements are as follows: a. Check the instrument and select the test current for the DC res...Read more -
Handheld Partial Discharge Detector Ultrasonic Measurement Method
Using built-in sensors for testing There are two principles for the partial discharge detection of switch cabinets: ultrasonic principle and transient ground voltage (TEV) principle. The ultrasonic sensor and TEV sensor built into this product are specifically used to measure the partial discharg...Read more -
Applications and Key Performance Indicators of Partial Discharge Shielding Rooms
Partial discharge (PD), abbreviated as PD, is the core indicator and precursor signal of insulation degradation in high-voltage electrical equipment. Accurate detection of PD signals is a critical method for assessing the operational condition of equipment insulation and preventing sudden insulat...Read more -
Classification and Installation & Commissioning of SF6 Gas Circuit Breakers
Sulfur hexafluoride gas circuit breaker The properties of SF6 gas The sulfur hexafluoride gas circuit breaker is a new type of high-voltage circuit breaker that uses SF6 gas as both the insulating medium and the arc-extinguishing medium. SF6 gas has a relatively high dielectric strength. Using...Read more -
Classification and selection method for ground grid grounding resistance testers
The grounding system is the core barrier for electrical safety in fields such as power, communication, construction, and industry. The grounding resistance value directly affects the stability of equipment operation and personal safety. Accurately measuring the grounding resistance of the groundi...Read more -
Different test wiring methods for anti-interference frequency-shift dielectric loss testers
Measurement of dielectric loss connection There are two connection methods for dielectric loss measurement: positive connection and reverse connection. The principle connection diagram can be found in the instruction manual. When both poles of the tested item are insulated from the ground (such ...Read more -
Principle of Surge Arrester Measurement and Method for Evaluating Test Results Performance
Surge Arrester Measurement Principle To determine whether a zinc oxide surge arrester has aged or become damp, the change in resistive current flowing through the arrester under normal operating voltage is typically observed, specifically by checking whether the resistive leakage current has inc...Read more