JPS61258619A - Stripper for 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 the Invention This invention relates to a tripping device for a circuit breaker, and more particularly to a tripping device for a circuit breaker that uses both an electronic undervoltage relay and an electronic overcurrent relay in combination. Regarding the removal device.

2. Description of the Related Art Conventionally, circuit breaker tripping devices include an undervoltage tripping device, a voltage tripping device, a magnetic flux switching device, and a combination of these devices. For example, if a circuit breaker is equipped with both an undervoltage tripping device and a magnetic flux switching magnetic disconnection device, and the voltage of the main circuit into which the circuit breaker is inserted becomes lower than a predetermined value, the undervoltage tripping device When the circuit breaker is tripped by the disconnection device and the current in the main circuit exceeds a predetermined value, the circuit breaker is tripped by the magnetic flux switching magnetic disconnection device in response to the overcurrent relay tripping signal. They were used together.

However, it is uneconomical to equip a circuit breaker with two tripping devices as described above, especially in the case of an undervoltage tripping device that functions with an electronic undervoltage relay. By using the release signal, it becomes possible to easily perform a tripping operation. Therefore, an undervoltage tripping device is provided with both functions to trip the circuit breaker.

Problems to be Solved by the Invention By the way, as mentioned above, in order to trip an undervoltage tripping device using a tripping signal from an overcurrent relay, the current flowing through the excitation coil of the undervoltage tripping device is usually The means for cutting off the current releases the movable iron piece of the tripping device that is in the attracted state, and in conjunction with this operation, the circuit breaker is tripped. However, due to the back electromotive force generated when the current of the excitation coil installed in the electromagnetic device is cut off, the magnetic flux of the movable iron piece does not decrease rapidly, and the tripping operation uses a normal magnetic flux switching magnetic disconnection device. The disadvantage was that it was slower than if it were done.

Therefore, the main object of the present invention is to provide a circuit that can instantaneously operate an undervoltage tripping device controlled by an electronic undervoltage relay using a tripping signal from an overcurrent relay. An object of the present invention is to provide a circuit breaker tripping device.

Means to Solve the Problem On the other hand, conventionally used electronic overcurrent disconnection devices for circuit breakers are usually a combination of an electronic overcurrent relay and a magnetic flux switching magnetic disconnection device. There is. This magnetic flux switching magnetic disconnection device generally includes a movable armature that connects or disconnects a fixed yoke. When the movable armature is in the polarized state, the permanent magnet that forms the magnetic circuit that attracts and holds it is excited by the trip signal from the electronic overcurrent relay, and the magnetic flux is generated in a direction that cancels out the magnetic flux of the permanent magnet. It consists of an excitation coil that generates electricity. The tripping device of the present invention provides an undervoltage tripping device with the function of the excitation coil of the above-described magnetic flux switching magnetic disconnection device.

That is, the electromagnet removal device according to the present invention includes a movable iron core, a fixed member including a yoke, a permanent magnet, a first coil that generates magnetic flux in the same direction as the magnetic flux of the permanent magnet, and a current that is applied in the direction of demagnetization. The electronic undervoltage relay includes a comparison means for comparing a voltage corresponding to the voltage of the main circuit into which the circuit breaker is inserted with a predetermined reference voltage, and a comparison means. The electronic overcurrent relay is configured with a switching means that applies an attraction signal to the first coil or cuts off the applied attraction signal depending on the determination result of the first coil. It consists of a tripping command means that outputs a tripping command to the electronic undervoltage relay when the value reaches one step, and a means that instantaneously sends current to the second coil at the same time as the tripping command.

In this invention, the comparison means applies an attraction signal to the first coil in response to determining that the voltage of the main circuit is higher than the reference voltage, and applies the attraction signal to the first coil if it is lower than the reference voltage. When the current in the main circuit reaches the value of the predetermined current one-hour characteristic, a tripping command is given to the electronic undervoltage relay, and current is instantaneously passed through the second coil. By this, N! A one-stone tripping device is used to remove the device.

Embodiment FIG. 2 is a longitudinal cross-sectional view showing an electromagnet removal device used in an embodiment of the present invention. In particular, FIG. ) is a diagram showing an open state.

First, the configuration of the electromagnet removal device will be described with reference to FIG. 2. A fixed member 1 constituting the yoke is made of a magnetic material, and a movable core guide member 2 for guiding a movable core 4 is provided within this fixed member 1. An excitation coil 3 is wound around this movable core guide tube 2 . This excitation coil 3 consists of a first coil 31 that attracts and holds the movable core 4 to the fixed member 1, and a second coil 32 that causes the movable core 4 to be removed from the fixed member 1 in response to an overcurrent release signal. , an intermediate point P is provided as a connection point for each. Inside the fixed member 1, permanent magnets 5゜5' are placed at predetermined positions so as to sandwich the rod-shaped movable core 4, and an elastic body 6 for moving the movable core 4 to a position where the circuit breaker is tripped. provided. The movable core guide 8 guides the movable core 4 and also serves to position the permanent magnet 5.5'. A cylindrical actuation cap 9 is provided at the tip of the movable core 4, and a tripping lever 10 is attached in relation to this.

In FIG. 2(a), when the movable core 4 is attracted and held, when the movable core 4 is manually pushed in, the permanent magnet 5.
Due to the magnetic flux of the magnetic circuit returning from 5' to the permanent magnet 5.5- through the air gap g, the movable iron core 4 and the fixed member 1, and the magnetic flux acting in the same direction as the magnetic flux of the permanent magnet 5.5' by the exciting coil 31. The movable core 4 is held within the fixed member 1 by the suction force overcoming the separation force by the elastic body 6.

When the excitation current of the first coil 31 of the excitation coil 3 is cut off and the resulting magnetic flux disappears, the magnetic flux generated by the permanent magnets 5 and 5' alone cannot overcome the force that causes the movable core 4 to separate from the elastic body 6. 2(b), and becomes separated as shown in FIG. 2(b).

FIG. 1 is an electrical circuit diagram of an embodiment of the present invention. Next, referring to FIG. 1, an electrical configuration of an embodiment of the present invention will be described. The voltage input circuit 11 includes a transformer connected to the main circuit. That is, 1 of the transformer
The secondary winding is connected to the main circuit, and a voltage obtained by stepping down the voltage of the main circuit is output from the secondary winding. The voltage of the secondary winding of the transformer is applied to the input setting circuit 12. This input setting circuit 12 performs full-wave rectification of the voltage generated in the secondary winding to make it a DC voltage, and when the main circuit line voltage is different, for example 100V or 110V, the rectified DC voltage is set to a constant value, The constant value of the DC voltage is averaged and the averaged DC voltage is provided to the comparator circuit 13.

The comparison circuit 13 compares the averaged DC voltage with a predetermined reference voltage. This reference voltage is selected to be a voltage that is equal to or lower than a specified value. Then, the comparison circuit 13 compares the reference voltage and the averaged DC voltage, and if the DC voltage is larger than the reference voltage, provides an attraction command signal to the base of the transistor 15. However, if the DC voltage becomes lower than the reference voltage, a tripping signal is given to the time limit circuit 14.

The time limit circuit 14 delays the trip command signal for a certain period of time, and applies the trip signal to the base of the transistor 15 after the delay time has elapsed. The collector of the transistor 15 is connected to one end of a first coil included in the excitation coil 3 , and the other end of the first coil 31 is connected to the voltage input circuit 11 .

A phototransistor 18 configuring a photocoupler 16 is connected to the base of the transistor 15 . The cathode of the light emitting diode 17 constituting the photocoupler 16 is connected to the output terminal TN, and the anode thereof is connected via the resistor 19 to the output terminal Tp. The second coil 32 included in the excitation coil 3 has one end connected to the output terminal TN,
The other end is connected to the other end of the first coil 31 . The output terminal Tp is connected to the voltage input circuit 11 via the diode 24, and is also connected to the control power supply circuit 21.

II tll power supply circuit 21 is current one hour characteristic relay circuit 2
Apply a control voltage to 0. The one-hour current characteristic relay circuit 20 provides a tripping signal to the tripping command circuit 22 when the current flowing through the main circuit reaches a predetermined value of one-hour current characteristic. The trip command circuit 22 provides a trip command signal to the gate of the thyristor 23 in response to the trip signal. The anode of the thyristor 23 is connected to the output terminal TN, and the cathode thereof is connected to the control power supply circuit 21. The one-hour current characteristic relay circuit 20, the control power supply circuit 21, the trip command circuit 22, and the thyristor 23 constitute an electronic overcurrent relay.

Next, the operation of an embodiment of the present invention will be described with reference to FIGS. 1 and 2. If the voltage of the main circuit is equal to or higher than the specified value, the comparison circuit 13 determines that the averaged DC voltage is greater than the reference voltage, and applies a high-level attraction signal to the base of the transistor 15. In response, the transistor 15 becomes conductive and a current (f) flows through the first coil included in the excitation coil 3 of the undervoltage tripping device. When the current flows through the first coil 31, the permanent magnet 5.5' A magnetic flux is generated in a direction that increases the magnetic flux of
The movable iron core 4 overcomes the separation force exerted by the elastic body 6 and is attracted and held by the fixed member 1.

In this state, when the main circuit voltage reaches a specified value or less, the comparator circuit 13 determines that the averaged DC voltage has become smaller than the reference voltage, and sends a low-level trip signal to the time limit circuit 14. give.

The time limit circuit 14 delays the tripping signal by a certain period of time and applies it to the base of the transistor 15. When the trip signal is applied to the transistor 15, the transistor 15 becomes non-conductive, and the current flowing through the first coil 31 is cut off. Then, the movable iron core 4 loses the magnetic flux caused by the first coil 31.
It is pulled off by the separating force of the elastic body 6. And Figure 2 (
As shown in b), the operating cap 9 works in conjunction with the tripping lever 10 to release the release device of the opening/closing mechanism of the circuit breaker;
Open the circuit breaker.

On the other hand, the above-mentioned comparison circuit 13 determines that the voltage of the main circuit is higher than the specified value and gives an attraction signal to the transistor 15, and current [f flows through the transistor 15 to the first coil 31. It is assumed that an overcurrent occurs in the main circuit while the movable iron core 4 is attracted and held by the fixed member 1. Then, the current one-hour characteristic relay circuit 20 gives a tripping signal to the tripping command circuit 22 when the predetermined value of the current one-hour characteristic is reached. The trip command circuit 22 provides a trip command signal to the gate of the thyristor 23 in response to the trip signal. Accordingly, the thyristor 23 becomes conductive,
A current is passed through the second coil 32 included in the excitation coil 3. As a result, magnetic flux is generated from the second coil 32 in a direction that reduces the magnetic flux generated by the current flowing through the first coil 31.

Further, a current It flows from the control power supply circuit 21 to the light emitting diode 17 via the resistor 19. light emitting diode 17
When a current flows through the phototransistor 18, the phototransistor 18 becomes conductive.
The base of transistor 15 is set to low level. As a result, the transistor 15 becomes non-conductive, and the first coil 3
No current flows through 1. As a result, the movable iron core 4
Current no longer flows through the second coil 31, and the second coil 32
A current flows through the permanent magnet 5.5-, generating a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet 5.5-, so that the permanent magnet 5.5- is instantly tripped. As a result, the operating cap 9 attached to the movable iron core 4 interlocks with the tripping lever 10 to instantly release the release device of the opening/closing mechanism of the circuit breaker, opening the circuit breaker.

Effects of the Invention As described above, according to the present invention, the attractive force caused by the magnetic flux of the first coil included in the permanent magnet and the excitation coil that attracts and holds the movable core to the fixed member causes the force of the elastic body to separate the movable core. In a state where the force is overcome, the current in the first coil is cut off to reduce the magnetic flux and separate the movable core, and the second coil causes the magnetic flux to flow in the opposite direction to the magnetic flux in the first coil. I made it to occur, so
It is possible to increase the separating force and instantly separate the movable core. Thereby, the circuit breaker connected to the movable core can also be quickly removed.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram of an embodiment of the present invention. Second
The figures are longitudinal cross-sectional views showing an electromagnetic release device used in an embodiment of the present invention. Particularly, FIG. 2(a) shows a state in which the electromagnet is held under suction, and FIG. 2(b) shows a state in which it is released. shows. In the figure, 1 is a fixed member, 2 is a movable core guide tube, and 3 is a fixed member.
is an exciting coil, 4 is a movable iron core, 5.5- is a permanent magnet, 6
9 is an elastic body, 9 is an operating cap, 10 is a release lever,
11 is a voltage input circuit, 12 is an input setting circuit, 13 is a comparison circuit, 14 is a time limit circuit, 15 is a transistor, 16 is a photocoupler, 19 is a resistor, 20 is a current one-hour characteristic relay circuit, and 21 is a control power supply circuit. , 22 is a trip command circuit, 23
indicates a thyristor, 31 indicates a first coil, and 32 indicates a second coil. Figure 2

Claims (2)

[Claims] (1) An electromagnetic tripping device, an electronic undervoltage relay,
A tripping device for a circuit breaker configured with an electronic overcurrent relay, the electromagnetic tripping device comprising: a movable core; a fixed member including a yoke with which the movable core comes into contact; Providing a permanent magnet for attracting and holding the fixed member, and an intermediate lead terminal dividing the permanent magnet into a first coil through which current flows in a direction to increase the magnetic flux and a second coil through which current flows in a direction to demagnetize the permanent magnet. an excitation coil, and an elastic member that separates the movable core from the fixed member, and the electronic undervoltage relay has a voltage corresponding to the voltage of the main circuit into which the circuit breaker is inserted and a predetermined voltage. a comparison means for comparing a voltage corresponding to the voltage of the main circuit with a reference voltage; switching means for applying a signal and cutting off an attraction signal being applied to the first coil in response to determining that a voltage corresponding to the voltage of the main circuit is lower than the reference voltage; The electronic overcurrent relay includes a tripping command unit that outputs a tripping command to the electronic undervoltage relay when the current in the main circuit reaches a value of a predetermined current-time characteristic; and means for instantaneously passing current through the second coil in response to a tripping command from the means. (2) The switching means is configured to cut off the attraction signal applied to the first coil in response to a tripping command from the electronic overcurrent relay. Circuit breaker tripping device.