CN209881381U

CN209881381U - Circuit breaker protection module with direct current and broadband measurement function

Info

Publication number: CN209881381U
Application number: CN201822189921.3U
Authority: CN
Inventors: 张伟强; 李永振; 谢建波
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2018-12-25
Filing date: 2018-12-25
Publication date: 2019-12-31
Anticipated expiration: 2028-12-25

Abstract

Circuit breaker protection module with direct current and wide band measurement function, its characterized in that: the intelligent power supply comprises a microprocessor MCU (1), a power supply unit (2), a tripping unit (3), a current acquisition unit (4), a Hall sensor (5), a shunt (6), an isolation amplification circuit (7), a frequency measurement unit (8) and an alarm indication unit (9); this circuit breaker protection module has adopted the hall to add the mode of shunt and has carried out the collection of direct current and wide band, and hall sensor gathers direct current and wide band electric current, and the electric current that the shunt calculated and hall calculate the electric current and regard as the output foundation of protection current simultaneously, and any collection electric current of all the way reaches the threshold current and can output the dropout instruction, has improved protection device's reliability.

Description

Circuit breaker protection module with direct current and broadband measurement function

Technical Field

The utility model belongs to the technical field of the circuit breaker, specifically say so and relate to a circuit breaker module with direct current and wide band measurement function.

Background

With the gradual depletion of traditional fossil energy, new energy is widely applied, and in the field of new energy mainly including photovoltaic power generation and wind power generation, direct current power generation and distribution systems are often involved and need direct current circuit breakers for protection. Compared with an alternating-current low-voltage circuit breaker, the low-voltage circuit breaker mainly adopts two modes, namely a Hall mode and a shunt mode, for sampling a direct-current signal or an alternating-current signal. The relative temperature of the shunt is increased a little, but the real-time is good, the accuracy of the Hall sensor is good, and the safety is high with isolation.

Chinese patent ZL201120275101.1 discloses a protection device for a dc low-voltage circuit breaker, comprising at least one shunt connected in series in a dc system, at least one signal filtering and amplifying circuit, at least one a/D converting circuit, at least one digital isolating circuit, a microprocessor and a power isolating circuit for supplying power, the shunt samples the direct current signal, the voltage drop at the two ends of the shunt is input into the signal filtering and amplifying circuit, after low-pass filtering and amplifying, after the analog signal is converted into digital signal by A/D converter circuit and the digital signal is input to digital isolating circuit to electrically isolate input signal from output signal, and the signals are transmitted to a microprocessor for calculation and judgment, and the device realizes the electrical isolation between input and output signals, has low cost and universality.

But because the external AD of this technical scheme and microprocessor adopt be the communication mode transmission data, because microprocessor receives external AD's data needs certain time, this can cause microprocessor to do the delay time of a byte when the transient interruption protection, and the temperature rise of shunt is higher simultaneously, and the condition that can appear toward big or little skew is exported moreover under high temperature.

SUMMERY OF THE UTILITY MODEL

The utility model aims at exactly causing the time delay when doing the instantaneous interruption protection to above-mentioned current protection device easily, and the temperature rise of shunt is higher, and output can appear toward big or toward little skew technical defect under the high temperature, a circuit breaker protection module with direct current and wide band measurement function is provided, the collection of direct current and wide band has been carried out to the mode that has adopted hall to add the shunt, hall sensor gathers direct current and wide band current, the current that the shunt calculated and hall calculate the output foundation of electric current as protection current simultaneously, any collection electric current all the way reaches threshold value electric current and can exports the dropout instruction, protection device's reliability has been improved.

Technical scheme

In order to realize above-mentioned technical purpose, the utility model provides a circuit breaker protection module with direct current and wide band measurement function, its characterized in that: the device comprises a microprocessor MCU, a power supply unit, a tripping unit, a current acquisition unit, a Hall sensor, a shunt, an isolation amplifying circuit, a frequency measurement unit and an alarm indication unit;

the Hall sensor and the current divider are respectively connected into a direct current system or an alternating current system in series;

the Hall sensor reduces the multiple of the acquired direct current system or alternating current system signal and then sends the signal to the current acquisition unit for multiple adjustment, the current acquisition unit sends the signal after multiple adjustment to the microprocessor MCU connected with the current acquisition unit for current calculation, meanwhile, the current acquisition unit outputs sine wave signals with different frequencies to the frequency measurement unit connected with the current acquisition unit, the frequency measurement unit integrates the sine waves with different frequencies into square waves with the same frequency and sends the square waves to the microprocessor MCU, and the microprocessor MCU calculates the signal frequency according to the square waves;

the shunt and the isolation amplifying circuit collect external direct current or alternating current signals, the shunt sends differential signals to the isolation amplifying circuit connected with the shunt for amplification, and the isolation amplifying circuit converts the collected external busbar current signals into voltage signals and sends the voltage signals to the microprocessor MCU;

and the power supply unit provides power supply for the microprocessor MCU.

Further, the microprocessor MCU calculates the signal frequency according to the square wave, judges whether the tripping unit 3 is started to trip or not, and enables the alarm indicating unit to display and alarm.

Further, the current acquisition unit is a current sensor.

Advantageous effects

The utility model provides a pair of circuit breaker protection module with direct current and wide band measurement function has adopted the mode that hall adds the shunt to carry out the collection of direct current and wide band, and hall sensor gathers direct current and wide band electric current, and the electric current that the shunt calculated calculates the output foundation of electric current as protection current with hall simultaneously, and any collection electric current all the way reaches threshold value electric current and can exports the dropout instruction, has improved protection device's reliability.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example one

As shown in fig. 1, the circuit breaker protection module with direct current and broadband measurement function includes a microprocessor MCU1, a power supply unit 2, a trip unit 3, a current collection unit 4, a hall sensor 5, a shunt 6, an isolation amplification circuit 7, a frequency measurement unit 8 and an alarm indication unit 9;

the Hall sensor 5 and the current divider 6 are respectively connected in series into a direct current system or an alternating current system;

the Hall sensor 5 reduces the multiple of the collected signals of the direct current system or the alternating current system and then sends the signals to the current collection unit 4 for multiple adjustment, the current collection unit 4 sends the signals after multiple adjustment to the microprocessor MCU1 connected with the current collection unit 4 for current calculation, meanwhile, the current collection unit 4 outputs sine wave signals with different frequencies to the frequency measurement unit 8 connected with the current collection unit, the frequency measurement unit 8 integrates the sine waves with different frequencies into square waves with the same frequency and sends the square waves to the microprocessor MCU1, and the microprocessor MCU1 calculates the signal frequency according to the square waves;

the shunt 6 and the isolation amplifying circuit 7 collect external direct current or alternating current signals, the shunt 6 sends differential signals to the isolation amplifying circuit 7 connected with the shunt 6 for amplification, and the isolation amplifying circuit 7 converts the collected external bus current signals into voltage signals and sends the voltage signals to the microprocessor MCU 1;

the power supply unit 2 supplies power to the microprocessor MCU 1.

The microprocessor MCU1 calculates the signal frequency according to the square wave and judges whether the tripping unit 3 is started to trip, and the alarm indicating unit 9 displays and alarms.

The current acquisition unit 4 is a current sensor.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. Circuit breaker protection module with direct current and wide band measurement function, its characterized in that: the intelligent power supply comprises a microprocessor MCU (1), a power supply unit (2), a tripping unit (3), a current acquisition unit (4), a Hall sensor (5), a shunt (6), an isolation amplification circuit (7), a frequency measurement unit (8) and an alarm indication unit (9);

the Hall sensor (5) and the current divider (6) are respectively connected in series into a direct current system or an alternating current system;

the Hall sensor (5) reduces the multiple of the collected signals of the direct current system or the alternating current system and then sends the signals to the current collection unit (4) for multiple adjustment, the current collection unit (4) sends the signals with the multiple adjusted to the microprocessor MCU (1) connected with the current collection unit for current calculation, meanwhile, the current collection unit (4) outputs sine wave signals with different frequencies to the frequency measurement unit (8) connected with the current collection unit, the frequency measurement unit (8) integrates the sine waves with different frequencies into square waves with the same frequency and sends the square waves to the microprocessor MCU (1), and the microprocessor MCU (1) calculates the signal frequency according to the square waves;

the differential signal is transmitted to the isolation amplifying circuit (7) connected with the shunt (6) for amplification processing, and the isolation amplifying circuit (7) converts the acquired external bus current signal into a voltage signal and transmits the voltage signal to the microprocessor MCU (1);

and the power supply unit (2) provides power supply for the microprocessor MCU (1).

2. The circuit breaker protection module with dc current and broadband measurement capability of claim 1, wherein: and the microprocessor MCU (1) calculates the signal frequency according to the square wave, judges whether the tripping unit (3) is started to trip or not, and enables the alarm indicating unit (9) to display and alarm.

3. The circuit breaker protection module with dc current and broadband measurement capability of claim 1, wherein: the current acquisition unit (4) is a current sensor.