JPS5836119A - Circuit breaker - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit interrupter, and in particular, detects an abnormal state of an electric circuit occurring between a circuit interrupter and a load device, displays an abnormality, and at the same time detects an abnormality if a fault current occurs. This invention relates to a circuit breaker designed to do the following.

Namely, 1. This invention converts analog signals from sensors that detect open-phase accidents in electric motors or short-circuit accidents in electric circuits into digital signals, and uses the software of a small and inexpensive microcomputer to make full use of memory to perform calculations and judgments. To provide a circuit breaker that operates a switching mechanism section in response to an output signal from a microcomputer to shut off the circuit breaker, and at the same time displays the cause of the L interruption using a display circuit such as a buzzer or a light emitting diode. A central example of the circuit breaker of the present invention will be described below with reference to the drawings. Fig. f11 is a circuit configuration diagram showing an embodiment of the circuit breaker according to the present invention, and Fig. 2 is a characteristic curve diagram showing the operating characteristics of the circuit breaker.

In FIG. 1, 1 (1) is a circuit interrupter, which is an overcurrent tripping element that trips a switching mechanism that opens and closes contacts using a well-known toggle link mechanism in response to an overcurrent or short-circuit current. #, an arc extinguishing device that extinguishes the arc that occurs when the electric wire is interrupted;
It is composed of a molded case in which the contacts and handles that open and close the circuit are integrated. ◎ (2) is the opening/closing mechanism section with 14-in and quick-off functions, even when the operating handle is restrained in the on position. Equipped with a trip-free function that does not disturb the tripping operation and a common color-release function that performs time-on and simultaneous cut-off between 8 poles, it is in a compatible relationship with the electromagnetic device (9) described later in SI 1 (8a) ~ ( 8C) is a one-through iron core that is arranged for each phase through one internal conductor of each phase and has a notch, and a Hall element (described later) is installed in the notch.
4a) to (4c) are equipped! Hall elements (4a) to (4C
) has the function of transmitting information to (4a) to (4c) ij A Hall element having a Hall effect, which transmits signals to one core (8a) to (
8C) generates a voltage proportional to the product of the magnetic flux passing through the interior and the current flowing inside, and outputs a voltage proportional to the current flowing through the single-circuit breaker to the output terminal. (5a) to (5C) are Hall elements (4a) to (4
C) with a voltage amplifier that amplifies the output voltage of the through core (8
a) If the current flowing directly through (8C) is normal, the output voltage of voltage amplifiers (5a) to (5C) will be set below the threshold (for example, 1.8V). In the case of abnormal direct current such as short circuit current, the value is set to a value higher than the threshold value. (6) is a logic circuit consisting of an OR element, and if the human input Ill A~0 are all IQI levels below the threshold, a voltage of the output mXFiloI level is output, and on the other hand, the input side A-0 is below the threshold. (voltage ll
If even one level voltage is manually applied, the output side
It outputs direct pressure of 11 level.

(7) is a microcomputer with 1 central processing refining (7a
) Clock pulse generator C'rb) t Program memory (7c), data memory (7d) e, and human output board (78) p, OR element (
6), and if an overload current Ia shown in Fig. 2 flows to the circuit breaker, a time delay %Ta is calculated, and after Ta time, the input/output board (7e
) more signal?・On the other hand, when short circuit current It) flows into the circuit breaker, it is programmed to output a signal from the input/output port (7e) at instantaneous TI). ・(8) is an amplifier device, 0 (9) is an electromagnetic device that has the function of amplifying the signal from the input/output boat (7e) with a transistor circuit (not shown) and the function of outputting a trigger signal from a trigger circuit (not shown). It receives a trigger signal, excites the electromagnetic coil, and drives the opening/closing mechanism section (2). (10a) to (IO
C) is a power supply side terminal (l) that has the function of connecting an external conductor.
la) ~ (llo) are load side terminals (12a) ~
(12c) is a voltage amplifier that amplifies the output voltage of ball elements (4a) to (4c) - through cores (8&) to (80)
If the current passing through the rated current drops below a certain reference value, the voltage amplifier (125L) to (12
The output voltage of o) is set to be below a certain value (for example, 1,8'V), and if a current higher than the normal current near the 1st current flows, it will exceed the threshold value. @0's is a logic circuit consisting of negative/negative elements, and the input sides A, B, and O are all at the lOl level below the threshold value, or the inputs 9111AB and O are at the lOl level. If even one of the IQ levels falls below the threshold, the output gllIX
outputs a voltage of 111 level, while the input (llll
When A, B, and O are all at lll level above the threshold, the rit output 1111X outputs a voltage of IQ level.

Microcomputer (7) with 041tf decoder
It is connected to the output side of the input/output boat (713).
Input @A, B, l:! , when all D are #OIO, decode it and output the output signal to the output @a ・Input 9Il
When lA is Ill, B, Q, and p are at lOI level, it decodes it and outputs an output signal to output 9111a. When the 0 input terminal C is Ill and the ID is IQ level, it decodes it and outputs an output signal to the output 1141IO. This is a device that receives an output signal from the output terminal a of the decoder 14 and indicates an overload condition using an f# alarm lamp or the like. 410- is a short circuit display device that outputs a signal from the output terminal a of the decoder 041. 07) is an open-phase display device that receives an output signal from the output terminal O of the decoder 041 and displays a short-circuit condition with an alarm or lamp, etc.・The end is a normal display device and the decoder α
A device that receives an output signal from the 4fD output terminal d and displays a normal state using a light emitting diode or the like.Next, the operation of the circuit breaker according to the present invention is as follows: first contact → first iron core (
8a) ~ (8c) tl-through → load side terminal (lla)
~(llc) If an overload current flows in this circuit, the Hall elements (4a) to (4C) will detect it, and the voltage amplifiers (5a) to (6C) and OR element (6) will An input signal is input to the microcomputer (7), and after a certain period of time Ta, an output signal is output from the human output boat (76). When an overcurrent flows, an output signal is output from the input/output port (7e) to the instantaneous TI), which drives the electromagnetic device t (9) to open/close 1. Mechanism part (2)
, Il- is activated to cut off the accident tortoise (R).

On the other hand, when normal current is flowing into the circuit breaker, the input sides A, B, and O of the NAND element 010 are all supplied with Ill level voltage from the voltage amplifiers (12a) to (12c). Since the voltage on the output side Since the current in the circuit with an open phase falls below the rated current, the IQ level voltage is supplied to the input side of the 1/D element (13). Therefore, its output side X becomes the Ill level voltage. Therefore, the G microcomputer (7), which inputs this input signal to the input/output capo (7e) of the microphone box/viewer (7), discriminates this input signal and immediately outputs the signal from the input/output port (7e). The output signal from this Hitodagata boat (7θ) drives the first electromagnetic device (9), activates the first opening/closing mechanism (2), and circuits to cut off the interrupter (1), thereby preventing burnout of the motor. 9 In the above operation, if the current flowing through the circuit interrupter (1) is normal, the input signals AB and O of the decoder I are all at the IO1 level, so the output signal is output only to the output gIJd, The normal status is displayed on the normal display device (1F4.) If an abnormality occurs in the current flowing to the circuit interrupter, the input/output capo of the microcomputer (7) will be displayed due to overload, short circuit, or open phase condition. 78) (7) An output signal is output from the output ia t b t c of the output boat (7e), and the signal is input to the input/output terminal of the decoder 04, so in an abnormal state, the overload display device 051 ．． The short circuit display device 41 can be used to display an alarm or a source signal on the open phase display device Oη. This invention is constructed as described above, and the microcomputer (7) detects an abnormality or abnormality in the circuit breaker (1). The open/close mechanism part (2) is activated by determining the open phase state of the electric motor, and the interrupter (1
), and at the same time, each display device 05) indicates what cause of the accident caused the circuit interrupter (1) to cut off.
Since the display is displayed at ~0η, accident countermeasures can be taken quickly.Also, since the discrimination and calculation processing are executed in the blank air, the internal mechanism of the circuit breaker becomes difficult to assemble. As described above, the present invention has various effects such as being able to display the cause of the accident that caused the circuit breaker to break, and being easy to assemble and compact.

[Brief explanation of the drawing]

Fig. 1 is a circuit configuration diagram showing an embodiment of the circuit breaker according to the present invention, and Fig. 2 is a characteristic diagram showing the operating characteristics of the circuit breaker. , (8a) to (8C)
is a through core, (41L) to (40) are Hall elements, (
5a) to (5C) are turtle pressure drawers, (8) are OR elements, (7) are microcomputers, (8) are amplifiers,
L9) vi [desired device, (12a) to (12c) are *Lf: m width device 10 field is a NAND element, ■ is a decoder, (
1-0119 is a display device. Agent Patent Attorney Makoto Kazuno

Claims (1)

[Claims] (1) A plurality of through cores are installed to penetrate through the conductors of each phase of the circuit breaker and each have a gap, and each core is installed in the gap and converts the magnetic flux caused by the current flowing through the conductor of each phase into voltage. A plurality of Hall elements 1 A plurality of X voltage amplifiers connected to each of the Hall elements and responsive to the current value flowing through the conductor of each phase 1 A progenitor to which the outputs of the plurality of voltage amplifiers are applied and input A microcomputer that generates an output to operate the opening/closing mechanism of the circuit breaker according to Umσ, and a display device connected to the microcomputer according to Umσ to indicate the cause of the interrupter being cut off. circuit breaker/