Harmonic elimination device is a high-capacity nonlinear resistor, which plays the role of damping and current limiting. It can well limit the occurrence of ferromagnetic resonance of voltage transformer. If the neutral point of the 6-35kV power grid is not grounded, the PT primary winding of the bus YO connection becomes the metallic channel of the power grid to the ground. There is a process of charging and discharging when the network capacitance to ground passes through the PT primary winding. The test shows that there is often a power frequency with amplitude of several amperes at this time, and this current may fuse the PT high-voltage fuse. The installation of harmonic eliminator can effectively control this inrush current, and the high-voltage fuse will not be blown due to this inrush current.
2021/05/18 11:30:13 The primary harmonic eliminator is used in the PT cabinet of the power grid, which can be divided into 6kV, 10kV and 35kV. The user needs to select the required primary harmonic eliminator according to the required voltage level. The primary resonance eliminator is mainly used to eliminate ferromagnetic resonance. So, what is ferromagnetic resonance? How did it come into being? Ferroresonance is the condition of co resonance formed by iron core inductance components, such as generators, transformers, voltage transformers, reactors, arc suppression coils and other capacitive components, such as transmission lines, capacitor compensators, etc., which excites continuous ferroresonance and causes the system to produce ferroresonance overvoltage. Ferroresonance can be divided into two categories, 1
2021/05/18 11:29:35 The small cable sheath protector contains a lot of energy in the body. According to the rapid development of various processes and power industry in recent years, it has evolved from spark gap, silicon carbide valve piece, metal oxide to current cable sheath protector. ZB-BHQ cable sheath protector, with good protection characteristics, can effectively limit the induced overvoltage and fault overvoltage of cable metal shield; The cable sheath protector has flat volt ampere characteristic curve, large flow capacity and good protection characteristics; The raw material adopts silicone rubber jacket, unique interface technology and overall one-time molding process, with good sealing, safety and explosion-proof, free of
2021/05/18 11:29:08 With the rapid development of the power industry, the demand for grounding resistance cabinets in this industry has also increased. For manufacturers of grounding resistance cabinets, it is important to produce grounding resistance cabinets, and the test and inspection before shipment are also very important. After the production of the grounding resistance cabinet is completed, the wiring and installation of the entire resistance cabinet shall be tested, and the identification of the grounding resistance cabinet shall be checked for correct installation. The contents shall match the resistance cabinet, such as the name, manufacturer, parameter setting, factory date, production number, etc. of the grounding resistance cabinet. After the above items are checked to be correct, the grounding resistance cabinet will be packaged, and ZB-GNR series
2021/05/14 10:24:16 Overvoltage protector is also called three-phase combined overvoltage protector in the electric power industry. Others call it three-phase combined lightning arrester, which is called overvoltage protector for short. It is a protection device that exists in the power system of 6kV and above and limits the occurrence of impulse overvoltage between two objects. Although it is said that the voltage protector is also called three-phase combined arrester, it is different from the arrester and more advanced than the arrester. Overvoltage protectors can be widely used in generators, transformers, switches, buses, motors and other electrical equipment to protect the insulation of these equipment from overvoltage damage. So, avoid
2021/05/12 11:40:22 The primary resonance elimination device is an intelligent power elimination device, which can effectively prevent the occurrence of malignant accidents such as the burning of voltage transformer caused by ferromagnetic resonance. And it has high precision. In the power system, ferroresonance occurs from time to time, and also occurs in the process of resonance, which seriously threatens the security of the system. Ferromagnetic overvoltage can occur in any system from 3 kV to 220 kV, especially in 35 kV. Almost all internal overvoltage accidents are caused by ferromagnetic resonance. The overvoltage caused by ferroresonance will last for a very short time, even a very short time. In the frequency division resonance, the overvoltage is generally not high, but when the fundamental wave
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