Arc elimination and harmonic elimination and overvoltage protector
A protection device and overvoltage technology, which is applied in the field of harmonic elimination and overvoltage protection devices and arc suppression, and can solve the problems of no effective method for high frequency current, amplified overvoltage coefficient, and interphase short circuit hazards, etc.
Inactive Publication Date: 2013-10-23
江苏八益电器有限公司
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Problems solved by technology
However, due to the diversity of power grid operation modes and the randomness of ground fault points, it is difficult to use arc suppression coils to compensate capacitive currents, and arc suppression coils are only used to compensate power frequency currents, and there is no effective method for high frequency currents.
Due to the limitation of the recovery voltage of the arc track, breakdown often occurs when it reaches the highest value, which amplifies the coefficient of overvoltage and cannot achieve the desired effect.
Another example is the direct grounding method of the faulty phase, because it cannot completely and accurately determine the faulty phase, it is easy to cause the hazard of short circuit between phases; because it cannot consume the excess charge on the bus, once it is withdrawn, it is easy to cause PT ferromagnetic resonance; for those with direct power supply Such equipment shall not be used in circuits such as high-voltage motors
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[0012] As shown in Figure 1, the schematic diagram of the circuit structure of the arc suppression harmonic elimination and overvoltage protection device of the present invention, the device includes: including an overvoltage comprehensive protector, a measurement PT, a switching controller, a switching contactor, a voltage limiter, an isolation switch.
[0013] Among them, the overvoltage comprehensive protector is composed of flexible current limiting circuit components, zinc oxide and silicon carbide components as phase components, and zinc oxide and silicon carbide components as ground components, which are combined in a star-shaped combination. The star connection method refers to: 3 phase components are connected to one end of a ground component to form an artificial neutral point; the other ends of the phase components are respectively connected to systems A, B, and C, and the other end of the ground component is connected to the system ground point. Both phase componen...
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The invention relates to the technical field of single-phase intermittent arc elimination and harmonic elimination and overvoltage protection in a power system with a non-directly earthed neutral, specifically an arc elimination and harmonic elimination and overvoltage protector. The protector comprises six parts: 1. comprehensive overvoltage protector; 2. a measurement potential transformer (PT); 3. a switching controller; 4. a switching contactor; 5. voltage limiter; 6. a disconnector. The protector can solve the problems of the arc elimination, the harmonic elimination and the overvoltage. The protector has complete functions, is safe to operate, and greatly improves the safety of lines.
Description
technical field [0001] The invention relates to the technical field of safety maintenance of medium-voltage power distribution systems, and more specifically relates to an arc suppression, harmonic elimination and overvoltage protection device. Background technique [0002] At present, most of the power distribution systems below 35kV in my country adopt the neutral point indirect grounding system. When a single-phase ground fault occurs in the neutral point non-directly grounded system, the fault current is a capacitive current. If it exceeds a certain limit, an unstable arc will be ignited on the ground. Accompanied by electromagnetic oscillation in the transient process, it is easy to cause single-phase intermittent Arc light grounding overvoltage, although the amplitude is not large, but if it exists for a long time, it will cause harm to equipment with weak insulation strength, and then cause more serious harm such as phase-to-phase short circuit. In addition, overvolt...
Claims
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IPC IPC(8): H02H9/08H02H9/04
Inventor 顾敏珠苏东华马晓云
Owner 江苏八益电器有限公司