JPS5836121A - Circuit breaker - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a circuit interrupter, and in particular, the terminal section of the circuit interrupter (VH) detects abnormal heat generated in the contact section, displays the abnormality, and at the same time detects fault current. 4, which relates to a circuit breaker that disconnects.

Conventionally, in this type of circuit breaker, if the connection of the terminal section that connects the external conductor is incomplete, the terminal section will burn out and the molded case will burn out significantly due to cuprous oxide multiplication heat generation phenomenon. will induce a 4 momme short circuit.

In addition, if a contact failure occurs due to foreign matter entering between the movable contact element and the fixed contact element, one circuit breaker will burn out.This invention was made to eliminate the drawbacks of the above-mentioned conventional circuit breaker. Then, the analog signal from the sensor that detects the circuit current is converted into a digital signal, and the time-limited frequency is fIPed using a small and inexpensive microcomputer.
In a circuit breaker configured to operate the four parts of the J7 switch and cut off the fault current, the microcomputer outputs the signals from the temperature detection elements of the terminals and contacts. The system uses a decoder connected to the input/output board of a microcomputer and an abnormal heat display device connected to the decoder to quickly detect and display abnormal heat generation points using human power. FIG. 2 is a circuit configuration diagram showing one 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 Figure 1, (1) is a circuit breaker that opens and closes contacts using a well-known toggle link mechanism.1 An overcurrent tripping element that trips in response to overcurrent or short circuit current; The arc extinguishing device that extinguishes the arc generated, the terminal for electrical machinery and conductors, the contactor for opening and closing the circuit, and the molded case that incorporates the torle are all integrated into a molded case. (2) is a fixed contactor. (2a)～(
2C) and movable contacts (2d) to (2f), the opening/closing mechanism has t master 9 and quick cut function, operation I, and trip 7 movement that does not disturb the tripping operation even when the handle is restrained in the on position. It has a common color removal function that turns on and off at the same time between 8 poles, and is compatible with the hypothetical electromagnetic device (111). (8a) to (8C) are the internal conductors of each phase. It is a one-pass iron core that has a notch for each phase that penetrates through the core, and Hall elements (4a) to (4c), which will be described later, are installed in the notch, and the current flowing through the internal conductor causes The generated magnetic flux is passed through a Hall element (4
a) to (4c) 0 having the function of transmitting Ic (4a
) to (4C) are Hall elements having a Hall effect that generate a direct pressure proportional to the product of the above magnetic flux passing through the inside of the cores (8a) to (8C) and the current flowing inside. O(5a) to (5C) output direct pressure to the output terminal which is proportional to the current flowing through the interrupter. This is an overload voltage amplifier, and its output direct voltage is
If the wL current passing through a) to (8C) is below the foot current value, it will be set below the threshold value (for example, 1.8 V), and the overload current will flow in the next case.・(6a) to (6b) are overcurrent voltage amplifiers, and their output voltages are set to a value above the threshold. If it is 10013% or less of the value, it is set below the threshold value (for example, 1. Ill V ), and if an overcurrent of 100% or more of the rated current flows in, it is set to the value above the threshold value. 7) +
(8) is a logic circuit consisting of an OR element, and if each input gAA-0 is all 10 levels below the threshold value,
Output 'IATJXu10 level (D fK pressure output, while input 91Q A~0, direct pressure (1
If even one 1# level, t tE ) is input, the output side Xic will output a full voltage of 11 level (9d
) and an input/output boat (98), and determines the input signal τ from the OR element (7).
If the current overloads 1 to the circuit breaker, then T
A time delay f'L is calculated, and a signal is output from the human output boat (9e) after a time Ta. On the other hand, if more than 1 short circuit current flows into the circuit breaker, the OR element (8) 001 is programmed to distinguish the human input signal from the input/output boat (98) and output the signal from the input/output boat (98) at instant Tb.
This device has a function of amplifying the signal from the device with a transistor circuit (not shown) and a function of outputting a trigger signal r from a trigger circuit (not shown). to excite the electromagnetic coil and drive the opening/closing mechanism section (2).
12c) is a power supply side terminal that has the function of connecting an external conductor, and (18a) to (18c) are load side terminals' (a
(14a) ~ (14c, ), (15a) ~ (15
c) * (16a) to (16c) are temperature detection devices, respectively power supply side terminals (12a) to (12C) @ fixed contacts (2a) to (2c) and movable contacts (2d) to (
2f) There is an IIT type circuit near the load side terminals (18a) to (18c) that detects abnormal heat generation and transmits it to the microcomputer L9), and each has a temperature detection element consisting of a thermistor and an output of the temperature detection element. oQη, which is composed of a voltage amplifier and a logic circuit that converts the analog voltage from the voltage amplifier into an IQI or #1# digital voltage, is connected to the input/output board of the microcomputer (9). The decoder connected to input/output capo) (9e) decodes the binary signal input from input/output capo) (9e), and
The abnormal heat generation display device O~, which has a function of converting into a base number, is connected to the decoder 〇η and displays abnormal heat generation.

Next, the behavior f'll of the circuit breaker according to the present invention is determined as follows.
Explain using Figures and @2 ◎ In Figure 1, the current flows from the power supply side terminals (12a) to (12c) → the contacts (2a) to (2f) of the opening/closing mechanism (2), and the 41-through iron core (8a) to (
8c) is passed through → it flows to the load side terminals (18a) to (18c) ◎ If an overload current flows in this circuit, the Hall elements (4a) to (4C) will detect it and The voltage amplifiers (5a) to (5C) and the OR element (7) input the human signal to the microcomputer (9), and after the time Ta%4 has elapsed, the signal is calculated by the microcomputer (9). Output 1 from input/output capo) (9e)
In addition, when an excessive current flows in this circuit, the input/output capacitor (current) is outputted by the voltage amplifiers (6a) to (6C) and the OR element (8). )(96)
The electromagnetic device (11) is driven by the output signal of the 0 input/output boat (98), which outputs an output signal from the 0 table, which operates the opening/closing mechanism (2) to cut off the fault current r.
1 Next, we will explain the operation of the decoder (lη) and #fuijisashiwakou using Table 1.Temperature detection device (14aJ~(1
40) * (16a) ”' (150) e (1
61) ``'If the degree of adoption in (16a) is positive, d,
Since each output signal is manually input to the microcomputer (9) in the IO level state, the output signals from the single output port (9e) are all at the IO level, and the decoder (Iη
input terminals A and B.

Input to 0 and D. The decoder 〇η decodes this and the D terminal on the output side becomes logic 1. 0 Next, the above power supply side terminal (
12a) abnormally heats up and if 7IC occurs, the temperature detection device (
Since the human input signal from 14a) is input to the microcomputer (9) at the 111 level, one output port) (9
6) outputs a 111 level output signal and inputs it to input terminal A of 1 decoder ) If abnormal heat is generated between the movable contact (2e) and the fixed contact (2b>), once the detected iron 1f (15b
) is input to the microcomputer (9) in the 11# level state, so an output signal of III level is output from the human output boat (9e) and input to the input terminals A and O of the 1 decoder 0η. 〇η is this sg
◎For abnormal heat generation display device 0 barrel, the decimal output terminal of the decoder is logic L.
When this happens, a 111-level voltage signal is output from Tomoko's point, so only that point lights up or an alarm is generated.For example, when the output terminal 1 of the decoder 〇η becomes logic 1, the abnormal heat generation display device O~ Part 1 indicates the lighting display or alarm JP @ occurs. Therefore, from Table 1, the power supply side terminal (
If the power supply side terminal (12a) generates abnormal heat, it can be determined whether the terminal (12a) has generated abnormal heat or not.
l# The L/bevel voltage signal is
) is input to the input/output port (9θ) of the microcomputer (9) and processed by the software of the microcomputer (9).
Since the N level signal is programmed to be manually operated, the decoder (I7) requires $11fl 1000
The decoder 〇η becomes a binary number of 0, which is fPItf, and the output terminal l becomes clIi1 logic 0.Therefore, the voltage signal at the 111 level from the decoder Oη causes a temperature of 1ft.
The part 1 of the = display device lights up or displays the eye report.
In other words, from Table 1, it is displayed that the 1st power supply side terminal (125L) is at an abnormal temperature.0 This invention is constructed as described above, and is circuited by the ns microcomputer (9) and flows into the interrupter (1). Distinguish the fault current caused by the fault current, drive the opening/closing mechanism (2) through appropriate arithmetic processing, immediately circuit the circuit interrupter (1) fL, and disconnect the circuit. The color can be displayed on the temperature display device Ql.Therefore, the cause of abnormal heat generation can be quickly identified by color, and accident countermeasures can be taken immediately.
Since the determination and arithmetic processing are executed by software, the circuit and the internal mechanism of the interrupter are simplified, making assembly easy and compact.

[Brief explanation of drawings]

Figure 1 is a circuit configuration diagram showing an embodiment of the circuit interrupter according to the present invention, and Figure 2 is a characteristic curve diagram showing the operating characteristics of the circuit interrupter. In the figure, t(2) is the opening/closing mechanism. Part, (8a) to (8C)
is one iron core s (4a) ”' (4c) rz Hall element, (6a) ~(50) e (6a) ~(
6a) is for overload 1 voltage amplifier for overcurrent % (7)
e (a) is the OR element, (9) is the microcomputer %a0 is the electromagnetic device between the amplifiers 1, (14a)
' (14c) e (151L) ~ (15c) e
(16a) - (16c) l'j temperature detection device, O
η is the decoder-5flLf temperature display device. 0 agents Patent attorney Makoto Kuzuno - 1st m "----7 "2a 2d2. 2b 2e
b12c・ 4C 4C1 ゛ 1 6c , - 1x x "" --11 1 1 1 111 11 1!1 ' 9d +9b l 1711 1 L HJ, 2nd factor □ [

Claims (1)

[Claims] (1) A single core of multiple tlffi installed through the conductors of each phase of the circuit breaker and each having an air gap, magnetic flux tl - voltage due to the respective currents installed in the air gaps and flowing through the conductors of each phase. a plurality of +d Hall elements that convert into
The conductor of each phase connected to each of the Hall elements is #,
t'L; b A plurality of voltage amplifiers that respond according to the current value 1 A microcomputer to which the outputs of the plurality of voltage quadrature amplifiers are applied and generates an output that operates the switching mechanism τ of the circuit breaker according to the inputted program. , circuit 9
Installed near the conductor connection part of Wlft 4 or the contact of the opening/closing mechanism t'L Detect abnormal heat generation of the connection part or the contact? 011 Microcomputer - A circuit e-disconnector characterized in that it is equipped with a temperature detecting device for transmitting temperature to the computer, and an abnormal heat generation display device connected to the microcomputer and displaying a place where abnormal heat is generated.