Overvoltage comprehensive control and arc suppression coil ground fault management system

Abstract

The invention relates to the technical field of power protection and discloses an overvoltage comprehensive control and arc suppression coil grounding fault management system. The system comprises a system voltage control module, an arc suppression coil automatic tracking compensation module, a fault positioning module, an internal overvoltage processing module, a grounding transformer and a monitoring center module, wherein the arc suppression coil automatic tracking compensation module, the fault positioning module and the internal overvoltage processing module are connected in parallel andthen are connected to a neutral point of the grounding transformer, and the grounding transformer and the system voltage control module are connected in parallel and then are connected to a bus systemof a power supply network. The system is advantaged in that cause of overvoltage and the possible damage are comprehensively considered, the voltage of the power grid is integrally controlled, safe operation of all power supply and consumption equipment of the whole equipotential system is ensured, continuity of power supply is ensured, the practical value is higher, and the application prospectis wide.

Description

technical field [0001] The invention relates to the technical field of electric power protection, in particular to an overvoltage comprehensive control and arc suppression coil grounding fault management system. Background technique [0002] The voltage control of the power supply network is different from the current protection. The current protection is generally implemented in units of branch circuits, which can be realized with comprehensive protection and circuit breakers. However, the voltage protection is at a certain voltage level. The entire power supply network is an equipotential, and it is relatively easy to handle Difficult, once a fault occurs, the loss will be greater, so the control of the system voltage is particularly important. At present, most of the protection schemes adopted in the medium-voltage power system adopt a single protection measure for a certain fault cause. For example, the protection scheme of PT and arrester cabinet, in which the arrester...

AI Technical Summary

Problems solved by technology

The effect in actual operation is not ideal, mainly because the whole medium-voltage power supply system is an equipotential, and if there is no overall coordination of parameters for various overvoltage protection devices, the protection settings cannot form an overall protection system. The result is As a result, some protection devices are useless, and even some protection devices themselves form a point of failure, which adds trouble to users.

For example, arc suppression cabinet products that "quickly change arc grounding to metal grounding" generally adopt a fast-acting scheme if there is no protection cooperation from the previous level. Then, once the voltage changes, even if it is instantaneous, the arc suppression device It will be grounded, and the technicians cannot determine the cause of the failure afterwards, which is the so-called false malfunction.

Some arc suppression cabinets set up by the user power supply network operate as many as dozens of times a year, and finally they can only be withdrawn from use. This is because the protection scheme does not form a whole

However, since the energy of a separate suppression cabinet cannot be set to infinity, once the energy of the overvoltage exceeds the design capacity, the energy suppression device will also break down and explode.

[0004] Further, since the control of power grid quality should include three levels of measurement, analysis, and processing, and the system voltage is often an equipotential, the protection scheme of using a certain product to prevent a single overvoltage has been unable to meet the requirements of modern power grids for power supply quality. protection requirements

Images