CN2590235Y

CN2590235Y - Electric leakage circuit breaker

Info

Publication number: CN2590235Y
Application number: CN 02261260
Authority: CN
Inventors: 高翔凌
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-11-05
Filing date: 2002-11-05
Publication date: 2003-12-03
Anticipated expiration: 2012-11-05

Abstract

The utility model discloses an electric leakage circuit breaker, which comprises a a filtering circuit which is composed of a zero sequence current transformer ZCT and capacitors C1, C2, C3, a rectification circuit, a switch control circuit which is composed of adjusting resistors R2, R3, a voltage dependent resistor MY, a thyristor SCR1, a relay J, and a switch HK, a test circuit which is formed by the series connection of a test button SA and a test resistor R1, and a residual current over standard detection and an alarm circuit. When the zero sequence current transformer ZTC detectes the value which is larger than the set value (which is adjusted between 3mA and 500mA as needed) and smaller than the standard value (I delta n) of the rated residual operating current of the electric leakage circuit breaker, the power supply for users is normal, and the alarm circuit begins to work to warn the users that electric leakage faults exist in self electricity using lines, so that the users can early discovery the faults to ascertain reasons and eliminate hazard. Therefore, compared with the existig electric leakage circuit breaker, the residual current over standard detection and alarm circuit which is additionally arranged in the utility model has a good function of making up faults.

Description

A kind of residual current circuit breaker

Technical field the utility model relates to a kind of residual current circuit breaker.

Background technology prevents the generation of electric shock accidents for ensureing Electrical Safety, with generally all adopting residual current circuit breaker (be residual current action breaker, be commonly called as electric protective device) function of automatically cutting off of circuit when realizing leaking electricity in the electric line.But, according to national standard, residual current circuit breaker could be cut off when only the residue in circuit (electric leakage) electric current reaches specified residue operating current standard value (I Δ n) automatically, and it can not produce any caution or action during less than specified residue operating current standard value at residue (electric leakage) electric current.Like this, for just can not being found in time and get rid of with having existed hidden danger or fault in the electric line this moment; Also can cause the frequent misoperation of residual current circuit breaker, the user be takeed for be the quality of residual current circuit breaker that problem is arranged, thereby influence the operate as normal of residual current circuit breaker, influence user's normal electricity consumption.

The summary of the invention technical problem to be solved in the utility model is to improve by the circuit of residual current circuit breaker is connected, and proposes a kind of when the residual current circuit breaker that can carry out automatic detection alarm with the residual current in the electric line between set point and specified residue operating current standard value the time.

For solving the problems of the technologies described above, residual current circuit breaker of the present utility model comprises filter circuit, the commutating circuit that zero sequence current mutual inductor ZCT, capacitor C 1, C2, C3 form, by adjusting switch control circuit that resistance R 2, R3, piezo-resistance MY, controllable silicon SCR 1, relay J, switch HK form and the test loop that is composed in series by test button SA and test resistance R1, in the circuit of residual current circuit breaker, also include residual current exceed standard detection, warn the loop.

Above-mentioned residual current circuit breaker, the detection that exceeds standard of described residual current, the caution loop is by commutating circuit, adjust resistance R 5, R6, current-limiting resistance R4, the caution device, controllable silicon SCR 2 connects to form, described current-limiting resistance R4, the caution device, be connected on after controllable silicon SCR 2 series connection between the negative electrode of the coil of described relay J and described controllable silicon SCR 1, the described adjustment resistance R of one output termination 5 backs of described commutating circuit extremely link to each other with the control of described controllable silicon SCR 2, another output links to each other with the negative electrode of described controllable silicon SCR 2, the input parallel connection of described two commutating circuits, two of described adjustment resistance R 6 terminate between the control utmost point and negative electrode of described controllable silicon SCR 2.

Above-mentioned residual current circuit breaker, the exceed standard detection, caution loop of described residual current connects to form by adjusting resistance R 5, R6, current-limiting resistance R4, caution device, controllable silicon SCR 2, be connected on after described current-limiting resistance R4,2 series connection of caution device, controllable silicon SCR between the negative electrode of the coil of described relay J and described controllable silicon SCR 1, the two ends of described adjustment resistance R 5 extremely link to each other with an output of described commutating circuit and the control of described controllable silicon SCR 2 respectively, and two of described adjustment resistance R 6 terminates between the control utmost point and negative electrode of described controllable silicon SCR 2.

Above-mentioned residual current circuit breaker is serially connected with an optocoupler follower at described caution device and 2 of controllable silicon SCR.Since residual current circuit breaker of the present utility model in circuit connects, increased residual current exceed standard detections, warn the loop, when zero sequence current mutual inductor ZCT detects when surpassing the specified residue operating current standard value of residual current circuit breaker with the residual current in the electric line, residual current circuit breaker disconnects supply line, and this is identical with existing working method.And when zero sequence current mutual inductor ZCT detects greater than set point (can adjust between the 3mA to 500mA as required) specified residue operating current standard value (I Δ n) less than residual current circuit breaker, controllable silicon SCR 1 disconnects, switch HK closure, the user powers normally, and controllable silicon SCR 2 conductings this moment, caution device (as light-emitting diode, buzzer, acousto-optic integrated circuit, speech IC etc.) is started working, had leak current fault in the usefulness electric line of call user's attention oneself, so that making it finds early, investigate thoroughly reason, remove a hidden danger.After the optocoupler follower is set in circuit, can send to automatic meter reading system by the residual current signal that the optocoupler follower will detect above set point, to show the information that exceeds standard with residual current in the electric line, power supply department just can be monitored and maintenance in time the line electrical leakage fault.Therefore, with respect to existing residual current circuit breaker, in the utility model newly-increased residual current exceed standard detections, warn the loop and can play good function and remedy effect, so that find in time, early with the hidden danger that exists in the electric line.

Description of drawings is described in further detail the utility model below in conjunction with the drawings and specific embodiments.

Fig. 1 is the circuit diagram of a kind of execution mode of the utility model residual current circuit breaker;

Fig. 2 is the circuit diagram of the another kind of execution mode of the utility model residual current circuit breaker;

Fig. 3 is the circuit diagram of the third execution mode of the utility model residual current circuit breaker

Embodiment as shown in Figure 1, residual current circuit breaker comprise filter circuit that zero sequence current mutual inductor ZCT, capacitor C 1, C2, C3 form, commutating circuit , by current limliting adjust switch control circuit that resistance R 2, R3, piezo-resistance MY, controllable silicon SCR 1, relay J, switch HK form, the test loop that is composed in series by test button SA and test resistance R1 and residual current exceed standard detection, warn the loop.Residual current detects, the caution loop is by commutating circuit , adjusts resistance R 5, R6, current-limiting resistance R4, light-emitting diode LCD, optocoupler follower, controllable silicon SCR 2 connect to form, be connected on after current-limiting resistance R4, light-emitting diode LCD, optocoupler follower and controllable silicon SCR 2 series connection between the negative electrode of the coil of relay J and controllable silicon SCR 1, the output termination of commutating circuit is adjusted resistance R 5 backs and is extremely linked to each other with the control of controllable silicon SCR 2, another output links to each other with the negative electrode of controllable silicon SCR 2, the input parallel connection of two commutating circuit,.

Shown in Figure 2 is the another kind of line connection of residual current circuit breaker, the exceed standard detection, caution loop of its residual current connects to form by adjusting resistance R 5, R6, current-limiting resistance R4, light-emitting diode LCD, controllable silicon SCR 2, be connected on after 2 series connection of current-limiting resistance R4, light-emitting diode LCD, controllable silicon SCR between the negative electrode of the coil of relay J and controllable silicon SCR 1, the two ends of adjusting resistance R 5 extremely link to each other with an output of commutating circuit and the control of controllable silicon SCR 2 respectively, adjust two of resistance R 6 and terminate between the control utmost point and negative electrode of controllable silicon SCR 2.

Residual current circuit breaker shown in Figure 3 is connected basic identical with the circuit of residual current circuit breaker shown in Figure 1, just residual current exceed standard detections, warn in the loop and omitted the optocoupler follower.Under the situation about also popularizing at present electric power automatic meter reading system, present embodiment has played detection, the warning function that residual current surpasses set point too.

In the utility model, optocoupler follower also other components and parts with identical function such as available relay substitutes.The various modes of connection such as that residual current circuit breaker of the present utility model can be applicable to simultaneously is single-phase, phase three-wire three or three-phase and four-line.

Claims

1, residual current circuit breaker, comprise filter circuit, commutating circuit that zero sequence current mutual inductor ZCT, capacitor C 1, C2, C3 form, by adjusting switch control circuit that resistance R 2, R3, piezo-resistance MY, controllable silicon SCR 1, relay J, switch HK form and the test loop that is composed in series by test button SA and test resistance R1, it is characterized in that, it also include residual current exceed standard detection, the caution loop.

2, residual current circuit breaker as claimed in claim 1, it is characterized in that, the detection that exceeds standard of described residual current, the caution loop is by commutating circuit, adjust resistance R 5, R6, current-limiting resistance R4, the caution device, controllable silicon SCR 2 connects to form, described current-limiting resistance R4, the caution device, be connected on after controllable silicon SCR 2 series connection between the negative electrode of the coil of described relay J and described controllable silicon SCR 1, the described adjustment resistance R of one output termination 5 backs of described commutating circuit extremely link to each other with the control of described controllable silicon SCR 2, another output links to each other with the negative electrode of described controllable silicon SCR 2, the input parallel connection of described two commutating circuits, two of described adjustment resistance R 6 terminate between the control utmost point and negative electrode of described controllable silicon SCR 2.

3, residual current circuit breaker as claimed in claim 1, it is characterized in that, the detection that exceeds standard of described residual current, the caution loop is by adjusting resistance R 5, R6, current-limiting resistance R4, the caution device, controllable silicon SCR 2 connects to form, described current-limiting resistance R4, the caution device, be connected on after controllable silicon SCR 2 series connection between the negative electrode of the coil of described relay J and described controllable silicon SCR 1, the two ends of described adjustment resistance R 5 extremely link to each other with an output of described commutating circuit and the control of described controllable silicon SCR 2 respectively, and two of described adjustment resistance R 6 terminates between the control utmost point and negative electrode of described controllable silicon SCR 2.

4, as claim 1,2 or 3 described residual current circuit breaker, it is characterized in that, be serially connected with an optocoupler follower at described caution device and 2 of controllable silicon SCR.