High voltage vacuum breaker

Abstract

A high-voltage vacuum breaker is used for operation or exit of an electrical apparatus in an electrical power system; the high-voltage vacuum breaker comprises a control panel, a control chamber, an arc-estinguishing chamber, an entrance insulative bushing, a digital relay, an electronic current mutual inductor, an outlet insulative bushing,; the electronic current mutual inductor is provided in the entrance or the outlet insulative bushing and connected with the digital relay; the digital relay is composed of a filtering and amplitude adjusting module, an A / D converting module, a CPU processing module, a liquid crystal display module, and a switch quantity input and output module, and is connected with an operation mechanism of the breaker by the switch quantity input and output module. Compared the invention with a current technic, the volume is not increased, measurement, protection and diagnoses functions in an electrical power line are organically integrated, added functions perform real-time on-line monitoring on a work state, a loop control state, and a coil opening / closing state of the breaker, thereby realizing intelligentized independent operation of the breaker.

Description

technical field [0001] The invention relates to the technical field of electric switches, in particular to a vacuum switch with functions of working state signal detection and relay protection. Background technique [0002] In power systems, circuit breakers are widely used as power distribution equipment. The high-voltage vacuum circuit breakers currently used in large quantities generally include a main body with a vacuum interrupter, a contact arm with an insulating sheath, and a control circuit board. There are three parts of the control room and the operating mechanism. The circuit breaker operating mechanism performs closing or opening action, and supplies power to or disconnects the electrical equipment connected to it; this kind of high-voltage vacuum circuit breaker has no working status signal detection and relay. Protection function, when the system is in an abnormal state such as overload, grounding, short circuit, three-phase current, voltage imbalance, etc., th...

AI Technical Summary

Problems solved by technology

[0002] In power systems, circuit breakers are widely used as power distribution equipment. The high-voltage vacuum circuit breakers currently used in large quantities generally include a main body with a vacuum interrupter, a contact arm with an insulating sheath, and a control circuit board. There are three parts of the control room and the operating mechanism. The circuit breaker operating mechanism performs closing or opening action, and supplies power to or disconnects the electrical equipment connected to it; this kind of high-voltage vacuum circuit breaker has no working status signal detection and relay. Protection function, when the system is in an abnormal state such as overload, grounding, short circuit, three-phase current, voltage imbalance, etc., the signal cannot be obtained, and the alarm and trip will be issued in time, so it cannot operate independently. It must be equipped with current, voltage transformers and Relay protection devices make up the switchgear so that it can work normally only if it has the function of relay protection; because the current transformer used in the switchgear is a traditional electromagnetic current transformer, it has large volume, large power consumption, high temperature and high cost. High and needs to be installed separately; at the same time, the rated current provided by this current transformer is 5 amperes or 1 ampere, while the microcomputer relay protection device can only handle the voltage of 5 volts, so a small level must be added to the protection device The transformer converts the current signal of 5 amps or 1 amp into a voltage signal of 5 volts, thus increasing the size of the relay protection device; with the development of electronic technology and high magnetic permeability soft magnetic material technology, small volume core The application of electronic current transformers, that is, electronic current transformers in power systems has become possible, but the current electronic current transformers have many advantages such as small size, low power consumption, high precision, and low temperature rise. Due to its low output voltage and output power - the output voltage is 225mV and the output power is 0.02w, it cannot be directly connected with conventional microcomputer relay protection devices, and a new system of digital relays is required

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