JPS61154421A - 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] [Field of Application of the Invention] The present invention relates to a circuit breaker that detects fault currents such as overcurrent and short circuits using an electronic circuit, and particularly relates to an output terminal suitable for improving the functionality of the circuit breaker. The present invention relates to a circuit breaker equipped with a circuit breaker.

[Background of the invention]

Conventional circuit breakers do not monitor the status of the main circuit. As described in 1j111 No. 58-80812, there was a device that issued an alarm in the event of an abnormality.

However, when inspecting the main circuit, it was necessary to accurately know the current, voltage, etc., so current transformers and transformers were installed separately. These j! In order to meet the demand for I, no consideration was given to outputting high-precision information in analog form to the outside.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a circuit breaker that allows the control panel and the switchboard to be made smaller by providing an output terminal that can externally measure information on the state of the main circuit.

[Summary of the Invention] The present invention includes a current detection means for detecting the current of each phase, an 1tR detection circuit configured to combine the outputs of the current detection means, and a detection circuit that determines the magnitude of the output of the current detection circuit. an overcurrent judgment circuit configured to In the circuit breaker, the current detecting means is connected to the current detecting circuit via a current/voltage converting means, and the current/voltage converting means has an external output terminal so that its output can be supplied to the outside. It is characterized by comprising the following.

In addition, one aspect of the present invention includes current detection means for detecting the current of each phase;
A current detection circuit configured to combine the outputs of the current detection means, an overcurrent determination circuit configured to determine the magnitude of the output of the current detection circuit, and a current determined by the overcurrent determination circuit. A circuit breaker comprising: a time limit circuit that determines the trip time; and a trigger circuit that energizes a trip coil by the output of the time limit circuit;
This device is characterized by incorporating an isolation transformer, the secondary side of which is connected to each phase of the power line and the external output terminal, and the secondary side of which is connected to an external output terminal.

Further, the present invention includes a current detection means for detecting the current of each phase;
The electric fi! *A current detection circuit configured to combine the outputs of the output means, an overcurrent determination circuit configured to determine the magnitude of the output of the current detection circuit, and a In a circuit breaker comprising a time limit circuit that determines the trip time based on the size and a trigger circuit that energizes the trip coil based on the output pressure of the time limit circuit, a power value is determined from the current value and voltage value of the electric circuit. The device is characterized in that it has a built-in power calculation circuit configured to calculate and output the power calculation circuit, and is equipped with an external output terminal so that the output of the power calculation circuit can be supplied to the outside.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIG. 1 and FIGS. 4 to 11. The general configuration of an electronic circuit breaker is as shown in FIG.

Load side terminal 2, main circuit conductive part 8, main circuit opening/closing mechanism part 4,
5. Current detection current transformers that are installed in various types of current detection means. It is composed of an overcurrent detection circuit 6 and a tripping device 7. Further, the overcurrent detection circuit 6 is configured in a K-shape including an 1tR detection circuit 24, an overcurrent determination circuit 25, a time limit circuit 26, and a trigger circuit 27, as shown in FIG. Further, the time limit circuit 26 is composed of a short time limit circuit, a long time limit circuit, and an instantaneous circuit.

In this electronic circuit breaker, a current detecting current transformer 5 detects a load current flowing through a main circuit 8 and inputs it to an overcurrent detecting circuit 6. The detection circuit 6 detects the maximum value of each pole current,
The time limit circuit 26 is operated according to the size, and the tripping device 7 is energized via the trigger circuit 27t.
to cut off the fault current. 15iI of the invention
! In this embodiment, in the electronic circuit breaker configured as described above, a resistor 8 serving as voltage/current converting means is connected in series with the current detecting current transformer 5 as shown in FIG. The KIJ- wires at both ends are connected and an output terminal 9 to the outside of the circuit breaker is provided. The current transformer 5 for detecting the current is the main circuit ji
GT style is rated 'W! The setting is such that the secondary output is 50 mA when the current is flowing. Therefore, since the winding resistance of the current transformer 5Fi is as large as several hundred ohms, even if the measuring resistor 8 of several ohms is connected in series, it will not affect the characteristics of the current transformer 5, and the loss in the resistor 8 will also be reduced. It is extremely small.

By outputting an output corresponding to the current from the output terminal 9 connected in this way, the following current monitoring function can be provided. Recorder at output terminal 9 (not shown)
By connecting this, it is possible to monitor changes in the current in the electrical circuit over time. In addition, a harmonic analysis circuit as shown in Fig. 6 may be connected to monitor harmful harmonic components, and K is the 7th harmonic component.
As shown in the figure, a circuit may be connected in which the ratio of the current of the electric path to the rated current is indicated by a light emitting diode 20.

Note that the current output terminal may be short-circuited when not in use.

FIG. 4 shows a second embodiment of the present invention, in which an insulating transformer 10 whose primary side is connected to each electric circuit is installed in order to obtain an output voltage corresponding to the voltage of the main circuit, and an output terminal is connected to the secondary side. 9' is installed. By connecting a voltmeter to this output terminal 9', if necessary, the current in the main circuit can be measured. This voltage output terminal has the following voltage monitoring function. A recorder (not shown) is connected to the output terminal l to measure the voltage of the electrical circuit, and it is possible to monitor changes in voltage over time, surges, impulses, frequency fluctuations, waveform distortion, power outages, etc. Also, a neon tube 21 and a resistor 22 are connected in series as shown in FIG.

Alternatively, as shown in FIG. 9, a light emitting diode 20 and a resistor 22 connected in series may be connected to the output terminal 9' to indicate whether or not the power source is active.

Further, as shown in FIG. 10, if the lighting start voltage is set using the Zener diode 2B, an undervoltage indication can also be made. Furthermore, by setting the voltage on the secondary side obtained by the transformer 1.10 to a loud value, it is possible to obtain a voltage output that is linked to the opening and closing of the circuit breaker and is isolated from the main circuit. It can be used as a control power source for equipment.

FIG. 5 shows a third embodiment of the present invention, in which the output of the current detecting current transformer 5 and the main circuit! This is an example in which the output of the connected transformer 1G is converted into electric power using the Hall element 11, and can be taken out to the outside via the output terminal 9'. The power calculation circuit 28 rectifies the main circuit voltage and sends it to the Hall element 11 as a control current, and converts the output of the current transformer 5 into a magnetic field with the coil 12 and applies it to the Hall 11 to obtain the product of the voltage and the current. By outputting this, the power is output as a voltage to the output terminal f. By connecting a recorder to this output terminal D, it is possible to know the change in power over time.

Further, as shown in FIG. 11, by connecting an integrating circuit to the output terminal q' via an amplifier circuit, the amount of electric power can be determined. In Figure 11.

This power amount is supplied to a reference value comparison circuit and is configured to be displayed and recorded if it exceeds a certain reference value, but if you only need to know the amount of power, the output of the integrating circuit is directly displayed. and may be recorded. Further, if the output of the output terminal q' is sufficiently large, the amplifier circuit may be omitted.

Further, even if the current applied is the same, if the power factor is different, the electric power will be a different value. Conventionally, tripping was performed by detecting the current, so depending on the equipment, the circuit breaker could trip before the specified amount of work was achieved due to the power factor.
In this embodiment, the configuration is such that power is detected and outputted to the output terminal v''.

If the lower breaker is connected to trip when a predetermined power level is reached, eel protection coordination using electric power can be performed.

In the above embodiment, one of the electric paths obtained at each output terminal
Information such as 1I current, voltage, power, etc. may be directly displayed on a display such as a liquid crystal built into the circuit breaker body.

〔Effect of the invention〕

According to the present invention, since the circuit breaker is provided with an output terminal that can measure the tR, % voltage or power of the main circuit, current transformers and transformers, which were conventionally provided on the other side of the switchboard and control panel, This eliminates the need for the board, making it possible to make the board smaller and cheaper.

[Brief explanation of the drawing]

FIG. 1 shows the first embodiment of the present invention (vR of the circuit breaker in
Figure 2 is a connection diagram showing the configuration of the electronic circuit breaker, Figure @8 is a block diagram showing its overcurrent detection circuit, and Figure 4 is a circuit in the second embodiment of the present invention. tJ45 is a connection diagram showing the configuration of a circuit breaker according to the third embodiment of the present invention. FIG. 6 is a block diagram of a circuit for measuring and recording harmonics. The figure is a circuit diagram of a circuit that displays the ratio of current in an electric line to the rated current, Figure 8 is a circuit diagram of a voltage display circuit for an electric line using a neon tube, and Figure WI9 is a circuit diagram of a voltage display circuit for an electric line using light emitting diodes. ,! Figure 10 is the circuit diagram of the underpressure display circuit.
FIG. 11 is a block diagram showing the configuration of the power amount display circuit. 5: Current detection means, 7: Tripping coil, 8: Current/voltage conversion means, 9.9', 9": External output terminal. lO: Isolation transformer, 24: Current detection circuit, 25: Overcurrent judgment circuit , 26: Time-limited circuit, 27:)+7ga once;;1
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Claims (1)

[Scope of Claims] 1. Current detection means for detecting the current of each phase, and a current detection circuit configured to combine the outputs of the current detection means;
an overcurrent determination circuit configured to determine the magnitude of the output of the current detection circuit; a time limit circuit that determines the tripping time based on the magnitude of the current determined by the overcurrent determination circuit; In a circuit breaker comprising a trigger circuit that energizes a tripping coil by an output, the current detection means is connected to the current detection circuit via a current/voltage conversion means, and the current/voltage conversion means is connected to the current detection circuit. A circuit breaker characterized by comprising an external output terminal so that output can be supplied to the outside. 2. a current detection means for detecting the current of each phase; a current detection circuit configured to combine the outputs of the current detection means;
an overcurrent determination circuit configured to determine the magnitude of the output of the current detection circuit; a time limit circuit that determines the tripping time based on the magnitude of the current determined by the overcurrent determination circuit; A circuit breaker that is equipped with a trigger circuit that energizes a tripping coil by output, and that includes a built-in isolation transformer whose primary side is connected to each phase of the electric circuit and whose secondary side is connected to an external output terminal. A circuit breaker featuring: 3. a current detection means for detecting the current of each phase; a current detection circuit configured to combine the outputs of the current detection means;
an overcurrent determination circuit configured to determine the magnitude of the output of the current detection circuit; a time limit circuit that determines the tripping time based on the magnitude of the current determined by the overcurrent determination circuit; A circuit breaker comprising a trigger circuit that energizes a tripping coil by an output includes a built-in power calculation circuit configured to calculate and output a power value from the current value and voltage value of the electric circuit, and A circuit breaker characterized by comprising an external output terminal so that the output of the arithmetic circuit can be supplied to the outside.