CN204029743U - A kind of definite purpose circuit breaker of low pressure anti-islanding device - Google Patents

Abstract

The utility model provides a special circuit breaker for a low-voltage anti-islanding device, which includes an anti-islanding anti-closing part and a line protection part, the output end of the current signal acquisition unit in the line protection part is connected to the input end of the single-chip microcomputer control unit , the output end of the single-chip control unit is connected to the input end of the fault discrimination unit, the output end of the fault discrimination unit is connected to the input end of the signal drive unit, the output end of the signal drive unit is connected to the control end of the tripping mechanism, and the operating mechanism of the tripping mechanism The linkage rod provided on the anti-closing electromagnet is connected through the traction rod, and the anti-closing electromagnet is connected with the power terminal of the release through the transformer and the control circuit.

Description

A special circuit breaker for low-voltage anti-islanding device

technical field

The utility model relates to a special circuit breaker for a low-voltage anti-islanding device.

Background technique

The current sensor and microcomputer monitor the vacuum degree of the vacuum bag. It uses wireless transmission signal to receive, but it cannot detect the vacuum circuit breaker above 110,000 KV, so the island effect cannot be eliminated, which brings great safety hazards to electric power maintenance personnel. , and conventional products cannot be energized for a long time, and once tripped, the power must be cut off, otherwise the coil will be burned.

Contents of the invention

The utility model provides a special circuit breaker for a low-voltage anti-islanding device, which can eliminate the islanding effect and improve safety.

The utility model adopts the following technical solutions: a special circuit breaker for low-voltage anti-islanding device, which is characterized in that it includes an anti-islanding anti-closing part and a line protection part, and the anti-islanding anti-closing part includes a tripper power terminal , mutual inductor, anti-closing electromagnet, draw bar, described line protection part comprises current signal acquisition unit, single-chip microcomputer control unit, fault discrimination unit, signal drive unit and tripping mechanism, the output of described current signal acquisition unit The terminal is connected to the input terminal of the single-chip microcomputer control unit, the output terminal of the single-chip microcomputer control unit is connected to the input terminal of the fault discrimination unit, the output terminal of the fault discrimination unit is connected to the input terminal of the signal driving unit, and the output terminal of the signal driving unit is connected to the tripping mechanism. At the control end, the operating mechanism of the tripping mechanism is connected to the linkage rod provided on the anti-closing electromagnet through the traction rod. The anti-closing electromagnet is connected to the power terminal of the release through the transformer and the control circuit. The signal acquisition unit collects the current and sends the current signal to the single-chip control unit, and the single-chip control unit will control the fault identification unit to perform fault identification. When a fault occurs, the fault identification unit outputs a driving signal to drive the tripping mechanism through the signal drive unit, tripping The mechanism controls the release state to be in the tripping state after the power terminal of the release is disconnected from the island voltage through the anti-closing electromagnet, transformer and control circuit.

The anti-closing electromagnet is integrated with the tripping mechanism. A parameter adjustment unit is connected to the single-chip microcomputer control unit.

The utility model has the following beneficial effects: after adopting the above technical scheme, the utility model puts in a low-voltage anti-islanding device to generate disturbance when the distribution transformer bus is powered off for maintenance, eliminates the islanding effect, and adds a safety line of defense for electric power maintenance personnel. The utility model adopts the current signal acquisition unit to collect various currents in the circuit. The transformer coil has a high number of turns and accurate sampling. It also adopts a single-chip microcomputer control program with precise calculation. Compared with traditional electronic products composed of integrated circuits, it has reliable performance and fast response. The utility model can withstand a longer rated short-time withstand current, and the maximum can withstand 2S. The anti-closing electromagnet and the tripping mechanism of the utility model are an integrated unit, so that the anti-closing electromagnet and the tripping mechanism are integrated. It can work with electricity for a long time, prevent the circuit breaker from closing, and keep the product in the tripping state. The integrated unit of the anti-closing electromagnet and the tripping mechanism can only be closed after the power is cut off. The protection action time t1 of the long-time delay protection function is adjusted and the 0 gear is added. When it is adjusted to 0 gear, the overload long-time delay protection function is turned off; by modifying the software program design, adjusting the parameters in the short-circuit characteristic curve, and at the same time after parameter compatibility debugging and Accurate sampling and calculation achieve the protection action time t2 of the short-circuit short-delay protection function. The delay step length is 1-2-3 seconds. 10 times the product.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

In Fig. 1, the utility model provides a special circuit breaker for a low-voltage anti-islanding device, which is characterized in that it includes an anti-islanding anti-closing part and a line protection part, and the anti-islanding anti-closing part includes a release power supply Terminals, transformers, anti-closing electromagnets, drawbars, the line protection part includes a current signal acquisition unit, a single-chip microcomputer control unit, a fault discrimination unit, a signal drive unit and a tripping mechanism, the current signal acquisition unit The output terminal is connected to the input terminal of the single-chip microcomputer control unit, the output terminal of the single-chip microcomputer control unit is connected to the input terminal of the fault discrimination unit, the output terminal of the fault discrimination unit is connected to the input terminal of the signal driving unit, and the output terminal of the signal driving unit is connected to the tripping mechanism The control end of the tripping mechanism, the operating mechanism of the tripping mechanism is connected by the linkage rod on the anti-closing electromagnet through the traction rod, the anti-closing electromagnet and the tripping mechanism are set as one, and the anti-closing electromagnet The connection between the circuit breaker and the control circuit and the power terminal of the trip unit, the current signal acquisition unit collects the current and sends the current signal to the single-chip control unit, and the single-chip control unit will control the fault identification unit to perform fault identification. When a fault occurs, the output of the fault identification unit sends out The driving signal drives the tripping mechanism to act through the signal driving unit, and the tripping mechanism controls the tripping device to be in the tripping state after the power terminal of the tripper is disconnected from the island voltage through the anti-closing electromagnet, transformer and control circuit. Parameter adjustment unit.

Claims (3)

1. A special circuit breaker for a low-voltage anti-islanding device, characterized in that it includes an anti-islanding anti-closing part and a line protection part, and the anti-islanding anti-closing part includes a release power terminal, a transformer, an anti-closing Electromagnet, drawbar, described line protection part comprises current signal acquisition unit, single-chip microcomputer control unit, fault discrimination unit, signal driving unit and tripping mechanism, the output terminal of described current signal acquisition unit and the input of single-chip microcomputer control unit The output terminal of the single-chip control unit is connected to the input terminal of the fault discrimination unit, the output terminal of the fault discrimination unit is connected to the input terminal of the signal drive unit, the output terminal of the signal drive unit is connected to the control terminal of the tripping mechanism, and the The operating mechanism is connected with the linkage rod provided on the anti-closing electromagnet through the traction rod. The anti-closing electromagnet is connected with the power terminal of the release through the transformer and the control circuit. The current signal acquisition unit collects the current and converts the current The signal is sent to the single-chip microcomputer control unit, and the single-chip microcomputer control unit will control the fault identification unit to perform fault identification. When a fault occurs, the fault identification unit outputs a driving signal to drive the tripping mechanism through the signal driving unit, and the tripping mechanism passes through the anti-closing electromagnet. , Transformer and control circuit control the power terminal of the release to be in the tripping state after disconnecting the island voltage. 2. The special circuit breaker for low-voltage anti-islanding device according to claim 1, characterized in that the anti-closing electromagnet is integrated with the tripping mechanism. 3. The special circuit breaker for low-voltage anti-islanding device according to claim 1, characterized in that said single-chip microcomputer control unit is connected with a parameter adjustment unit.