Preguntas frecuentes

What is on-load voltage regulation of transformers? (Part 2) The principle of on-load voltage regulation is to set multiple taps on the high-voltage winding or low-voltage winding of the transformer. By switching the tap changer, different taps are connected to the circuit to change the number of turns of the winding...

What is the function of a reactor? Reactor commonly used in power systems include series reactors and shunt reactors. Series reactors are primarily used to limit short-circuit currents, and they can also be connected in series or parallel with capacitors in filters to limit high-order harmonics in the grid. Reactors...

How to Suppress Reactor Resonance Overvoltage?  – Collaborative Design of Damping Resistors and Filters In power system operation, the LC resonance circuit formed by reactors and distributed capacitance can generate dangerous overvoltage phenomena. According to measured data from IEEE Std. C57.21-2021, the peak resonance overvoltage can reach 2-3 times the...

How is the lightning arrester protection of the transformer carried out? The lightning arrester is the most crucial basic component for protecting power generation equipment and transmission and transformation equipment. It also forms the foundation for determining the insulation level of high-voltage electrical equipment. Installed in front of the transformer,...

What are the precautions for live oil filtration? (1) Throughout the entire process of live oil filtration and degassing, the gas relay circuit of the transformer must be connected to the signal circuit to prevent gas leakage and oil running in the pipeline, causing the oil switch to trip and...

How are the deviation values of transformer parameters and the parameters using peak values specified? The specifications for evaluating the performance parameters of transformers are determined by technical conditions, and each standard value has corresponding deviation values, which can be categorized into several types: (1) Parameters with only a lower...

How is the testing of transformer oil conducted? The dielectric strength test of transformer oil is conducted using a 500mm³ standard oil cup in a 60kV AC frequency oil tester. The brass electrodes of the oil cup have a diameter of 25mm, and the surface cleanliness is as shown in...

How is the measurement of insulation resistance and absorption ratio conducted? Insulation resistance, denoted as R, is typically determined by applying a voltage of 2500V for 60 seconds and measuring the resulting value using a megohmmeter with a maximum range of 10000 MQ. Due to variations in the stability of...

How is the measurement of winding resistance conducted? When measuring winding resistance, both the bridge method and voltage drop method are employed. For resistance values exceeding 100, a single-arm bridge is utilized, while for values below 102, a double-arm bridge is employed. In the voltage drop method, a power source...

What are the common electrical tests for transformers? Conventional electrical tests for transformers are designed to identify internal faults and primarily include the following: (1) Voltage Ratio Test: Used to verify the voltage ratio and determine if there are short circuits between turns or layers, or if switch leads are...

How to conduct a pump test for oil-immersed transformers? Performing a pump test for oil-immersed transformers is an essential step in the production and maintenance processes. For transformers that have completed the assembly, especially those with a capacity of 8000kVA, voltage of 35kV and below, and equipped with an oil...

How to perform oil leak repair? To achieve oil welding repair, the following measures can be taken: (1) Selection of Welding Method for Oil Leak Repair： Considering the characteristic of rapid heat dissipation in oil leak repair, arc welding should be used for repairs instead of gas welding. (2) Pre-treatment...