JP3334340B2 - Switch operation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch operation control device, and more particularly to an improvement of a switch control circuit for a high-voltage circuit breaker or the like.

[0002]

2. Description of the Related Art FIG. 4 shows a general operation device of a circuit breaker. In FIG. 4, reference numeral 1 denotes a vacuum interrupter having a fixed contact 1a and a movable contact 1b. Reference numeral 2 denotes an operation plate connected to the movable contact 1b of the vacuum interrupter 1, which is slidably mounted on the fixed frame 3. Reference numeral 4 denotes a contact pressure spring, and reference numeral 5 denotes a breaking spring provided between the operation plate 2 and another fixed portion. Reference numeral 6 denotes a first connection link connecting the operation plate 2 and the driving force transmission lever 7, 8 denotes an operation link pivotally connected between the first connection link 6 and the transmission lever 7, 9 denotes a roller attached to the pin 10, 11 is a roller, and 12 is a link return spring. 13 is a trip hook, 14 is a trip hook return spring, and the trip hook 13 and the roller 11 are engaged. Reference numeral 15 denotes a stopper, 16 denotes a second connection link connected to the driving force transmission lever 7, 17 denotes a rotatable hit prevention bracket connected to the second connection link 16, and 18 denotes a return spring. is there.

Reference numeral 19 denotes a closing spring having one end fixed and the other end connected to a closing lever 22 by a pin 21. Reference numeral 23 denotes a closing hook. A roller 24 is provided at the tip, and a closing hook return spring 25 is connected to the base. Have been. Reference numeral 26 denotes an operation shaft, on which the closing lever 22, the closing cam 27, the rotation stop ratchet 28, the feed ratchet 29, and the limit switch actuating cam 32 are integrally mounted. 28a is a locking claw for locking the ratchet wheel 28, 29a
Is a feed claw. The feed pawl lever 31 is rotatably supported by the operation shaft 26.

Reference numeral 20 denotes a closing electromagnet, 30 denotes a closing spring energy-storing motor whose rotating shaft 30a is connected to a lever 31 via a transmission link 33, 40 denotes a limit switch operated by a cam 32, and 50 denotes a tripping electromagnet. , 60 are repetition prevention relays arranged near the roller 9 and operated by the pins 10;
The motor 0, the motor 30, the limit switch 40, the trip electromagnet 50, and the repeat prevention relay 60 constitute an operation control circuit as described later.

FIG. 3 shows a conventional operation control device for controlling the operation device shown in FIG. In the figure, 52Y is a coil of a repeat prevention relay 60, and the relay 60 has a normally closed contact 52Yb. 52C is a circuit breaker input electromagnet 20
The coil 88M has a normally open contact 88Ma and a normally closed contact 88M.
b, a motor operating electromagnetic contactor having b, M (30) is a closing spring accumulating motor, 52T is a coil of the trip electromagnet 20, 52a and 52b are auxiliary contacts of a circuit breaker, CS1
Is a closing command switch, and CS2 is a shutoff command switch. In the operation control device of FIG.
S1, a series circuit including a normally closed contact 52Yb of the repeat prevention relay 60, a closing coil 52C of the closing electromagnet 20, a breaker auxiliary contact (normally closed contact) 52b, and a normally closed contact 88Mb of the motor operating electromagnetic contactor 88M; The coil 52Y of the repeat prevention relay 60 connected between the connection point between the closing command switch CS1 and the normally closed contact 52Yb and the negative terminal N (-) of the control power supply, the electromagnetic contactor 88M and the limit switch LS1 (40) A closing circuit A is constituted by the series circuit. B is a closing spring accumulating circuit in which a normally open contact 88Ma of an electromagnetic contactor 88M for operating the motor M is connected in series to the motor M, and C is a cutoff command switch CS2.
This is a breaking circuit in which the breaker auxiliary contact 52a and the trip coil 52T of the trip electromagnet 50 are connected in series.

FIG. 4 shows a state in which the charging of the closing spring 19 is completed, and the limit switch 40 (LS1) is connected to the closing spring 1
Numeral 9 is on when the power is released, and is off when the power storage is completed.

Therefore, in FIG. 3, the limit switch LS1 is off, and in this state, the closing command switch CS
When 1 is input, the input coil 52C and the repetition prevention coil 5
2Y is excited, whereby the roller 24 of the insertion hook 23 is removed from the notch of the insertion lever 22, and the insertion spring 19
Is released and pushes the roller of the link mechanism, and the circuit breaker is turned on. Immediately before the closing operation is completed, the normally closed contact 52Yb of the repetition prevention relay 60 is opened to prevent the circuit breaker from being repeatedly turned on even when the switch CS1 is continuously turned on.

Next, when the circuit breaker is cut off, the auxiliary contact 52a is turned on and the switch 52b is turned off when the circuit breaker is turned on. Therefore, when the circuit breaker command switch CS2 is turned on, the trip coil 52T of the trip electromagnet 50 is turned off. Energize. As a result, the tripping electromagnet 50 hits the tripping hook 13, and the circuit breaker enters a breaking state.

When the closing spring 19 is released, the limit switch LS1 (40) is on, so that the motor operating electromagnetic contactor 88M operates, the contact 88Mb is turned off, and the closing coil 52C is deenergized. At the same time, the contact 88Ma is turned on, and the motor (30) performs differential operation. Thus, as shown in FIG.
6, the input lever 22 is rotated clockwise,
The closing spring 19 is charged and enters a closing reset state.

In the apparatus shown in FIG. 3, it is assumed that the initial state of the circuit breaker is set to the cut-off state and the closing spring is charged. A control voltage DC10 normally used between PN
0 V is applied. At this time, the auxiliary contact 5 of the circuit breaker
2a is off, and 52b is on. In this state, when the closing command switch CS1 is turned on, a closing control current (normally about 2 A to less than 10 A) flows through the relay 52C, the relay 52C is excited, and the circuit breaker is turned on. During the closing operation, the auxiliary contact 52b is turned off and the closing control circuit A is cut off. The contact 52a is turned on, and is ready for the tripping operation. Next, when the trip command switch CS2 is turned on, the relay 52T is excited, the circuit breaker performs a trip operation, the auxiliary contact 52a is turned off, the 52b is turned on, and the circuit C is cut off.

[0011]

In the circuit shown in FIG. 3, each time the circuit breaker performs the closing / tripping operation, the auxiliary contacts 52a, 5
Since 2b cuts off the coil load current of less than 2A to 10A, the contact life of the auxiliary contact is short. Therefore,
When used for a frequent switch of the class of 10,000 to several million times, it has been difficult to secure the reliability of the auxiliary contact.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object the use of a semiconductor switching element in place of a contact of an auxiliary switch to provide a long-life and highly reliable switch operation control. It is to provide a device.

[0013]

In order to achieve the above object, an operation control device for a switch according to the invention of claim 1 controls a breaking operation and a closing operation of a breaker by spring forces of a breaking spring and a closing spring, respectively. In the operation control device for the switch, which is performed through a link mechanism and stores the closing spring by a closing spring storing motor, a closing command switch for issuing a closing command, and a closing command switch in series with the closing command switch. A closing coil connected thereto, a semiconductor switching element connected in series to the closing coil, a normally closed contact of a repeat prevention relay connected in series to the semiconductor switching element, and energized in response to a closing command; And a series circuit for connecting the auxiliary contact and a resistor in series to control on / off of the semiconductor switching element. And a disconnection command switch for issuing a disconnection command, a trip coil connected in series to the disconnection command switch, a semiconductor switching element connected in series to the trip coil, an auxiliary contact of the circuit breaker and a resistor connected in series. The semiconductor switching element includes a series circuit for controlling on / off of the semiconductor switching element, and is constituted by a breaking open circuit for controlling the breaking operation.

According to a second aspect of the present invention, there is provided an operation control device for a switch, wherein a breaking operation and a closing operation of a breaker are performed by a spring mechanism of a breaking spring and a closing spring via a link mechanism, respectively. In an operation control device for a switch in which a bias is performed by a closing spring accumulating motor, a closing command switch for issuing a closing command, a closing coil connected in series to the closing command switch, and a closing coil connected in series to the closing coil. A series circuit in which an auxiliary contact of a circuit breaker and a resistor are connected in series to control on / off of the semiconductor switching element; and a resistor circuit and a control electrode connected in parallel to the switching element. A repetition prevention circuit consisting of semiconductor switching connected to a voltage dividing point and having a main electrode connected in parallel to the resistance element of the series circuit. Seen, and on circuit for controlling the closing operation, and cut off the command switch that emits interruption command, the releasing coil connected in series to the cut-off command switch,
A semiconductor switching element connected in series to the trip coil, a series circuit in which an auxiliary contact and a resistor of a circuit breaker are connected in series to control ON / OFF of the semiconductor switching element, and a breaking circuit for controlling the breaking operation It is characterized by comprising.

[0015]

According to the first aspect of the present invention, in the control circuit of the switch, when interrupting the control coil current at the time of switching control, a switching element is used in place of the conventionally used auxiliary switch, and the switching circuit of the auxiliary switch is used. The contact is used to turn on and off the control current of the switching element, and the control coil current is cut off by the switching element. When the switch is in the open state, the normally closed contact of the auxiliary switch is on, and a control current flows through the normally closed contact to the switching element connected in series to the closing coil, thereby turning on the switching element. State. At this time, when the positive electrode voltage is energized as a switch closing command, a closing control coil current flows through the switching element, and a closing operation is performed. When the closing operation is completed, the normally closed contact is turned off, and accordingly, the switching element is turned off, and the closing control coil current is cut off. Also,
Similarly, when the switch is in the closed state, the cutoff control coil current is cut off by the switching element.

According to the second aspect of the present invention, in the control circuit of the switch, when the control coil current at the time of switching control is cut off,
A switching element is used in place of the conventionally used auxiliary switch, and the auxiliary contact is used to turn on / off the gate current of the switching element. When the switch is in the open state, the normally closed contact of the auxiliary switch is on. At this time, when the positive voltage is energized as a closing command, the auxiliary switch is connected in series to the closing coil via the normally closed contact. A gate current flows through the switched switching element, the switching element is turned on, a closing control current flows, and a closing operation is performed. When the closing operation is completed, the normally closed contact is turned off, and accordingly, the switching element is turned off and the closing control current is cut off. Similarly, when the switch is in the closed state, the control current of the switching element is turned on / off by the normally open contact of the auxiliary switch, and the cutoff control current is cut off by the switching element. Further, when the closing command is continuously energized while the switch is in the closed state, the control current of the switching element that interrupts the closing control current is prevented, and the pumping operation is prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an operation control device of a circuit breaker according to an embodiment of the present invention, which is applied to the operation device of FIG.
The same or corresponding parts as those in FIG. 3 are denoted by the same reference numerals.

In this embodiment, the closing command switch C
S1, closing coil 52C of closing electromagnet 20, transistor 70a which is a semiconductor switching element, reversing prevention relay 52Y (60) and its normally closed contact 52Yb, resistor 71
A to 73a and diodes 74a and 74b constitute a closing circuit A. That is, the closing command switch CS1, the closing coil 52C, the transistor 7a and the normally closed contact 52Yb are connected in series, and the transistor 70a
The coil 52Y of the reversal prevention relay 60 is connected in parallel to a series circuit composed of the normally closed contacts 5Yb. A resistor 73a is connected between a voltage dividing point of a series circuit including a circuit breaker auxiliary contact (normally closed contact) 52b and resistors 71a and 71b and a base electrode of the transistor 70a.

A breaking circuit C is constituted by the breaking command switch CS2, the trip coil 52T of the trip electromagnet 50, the transistor 70b as a semiconductor switching element, the breaker auxiliary contact (normally open contact) 52a, and the resistors 71b to 73b. You. The break command switch CS1, trip coil 52T and transistor 70b form a series circuit, and the breaker auxiliary contact 52a and the resistors 71b, 72
A resistor 73b is connected between the voltage dividing point of the series circuit b and the base plate of the transistor 7b.

In the operation control device shown in FIG. 1, when the initial state of the circuit breaker is set to the cut-off state, the contact 52 of the auxiliary switch is
a is off and 52b is on. 100 V is always applied between PN. In this state, a base current (control current) flows through the transistor 70a according to the shared voltage of the resistors 71a and 72a, and the transistor 70a is turned on. At this time, closing coil 52C current I ₁ flows Turning on closing command switch CS1 is energized, circuit breaker performs a closing operation. During the closing operation of the circuit breaker, the auxiliary contact 52b is turned off, and the transistor 70a
By the base current of is interrupted, the transistor 70a is a current I ₁ turned off is also interrupted.

On the other hand, at this time, in the shutoff circuit C, the contact 52a is turned on, and the transistor 70b is turned on. By turning on the transistor 70b, when turning on the cut-off command switch CS2, it is energized releasing coil 52T current I ₂ flows breaker becomes cut off performs a tripping operation. The cut off of the circuit breaker, the contact 52a is turned off, the current I ₂ and the transistor 70b is turned off is interrupted.

According to the above embodiment, the following effects are obtained by using a transistor instead of the contact of the auxiliary switch.

(1) The contact of the auxiliary switch used in the closing and tripping control circuit cuts off a very small current of several mA to several tens mA, but a current of less than 2 A to 10 A as in the conventional circuit. Will not be cut off. Therefore, the electric life is almost infinite, the auxiliary switch continues to operate until the mechanical life is reduced, and the reliability is improved by extending the life of the auxiliary contact.

(2) The specification of the contact capacity of the auxiliary switch can be reduced, and the auxiliary switch can be reduced in size, and the operating mechanism of the switch can be reduced in size.

FIG. 2 shows a circuit breaker operation control device according to another embodiment of the present invention, in which the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals.

In this embodiment, the closing command switch C
S1, closing coil 52C, transistors 70a, 70
C, auxiliary contact 52b and resistors 71a, 72a, 76,
77 constitutes a closing circuit A, and a breaking command switch CS2, a transistor 70b, an auxiliary contact 52a, and resistors 71b and 72b form a breaking circuit C.

In the closing circuit A, a series circuit is formed by the closing command switch CS1, the auxiliary relay 52C and the transistor 70a, and the series circuit including the auxiliary relay 52C and the transistor 70a is a series circuit including the auxiliary contact 52b and the resistors 71a and 72a. The circuits are connected in parallel, and a series circuit including resistors 76 and 77 is connected in parallel to the transistor 70a. Also, a transistor 70c is connected in parallel to the resistor 72a, a base electrode of the transistor 70a is connected to a connection point of the resistors 71a and 72a, and a base electrode of the transistor 70c is connected to a connection point of the resistors 76 and 77. I have.

In the breaking circuit C, the breaking command switch C
S2, the trip coil 52T and the transistor 70b form a series circuit, and the auxiliary contact 52 and the resistor 71
A series circuit is formed by b and 72b, and a base electrode of the transistor 70b is connected to a connection point between the resistors 71b and 72b.

In the closing circuit A, when the circuit breaker is in the cut-off state, the auxiliary contact 52b is on, and when the closing command switch is turned on, the voltage divided by the resistors 71a and 72a is controlled by the transistor 70a. The signal is applied as a signal, the transistor 70a is turned on, the closing coil 52C operates, and the circuit breaker performs the closing operation. When the closing is completed, the contact 52b is turned off and the transistor 7
The base potential of 0c becomes the same as N of the power supply. For this reason,
The transistor 70a is turned off, and the input coil current I
To shut off the _1.

In the shutoff circuit C, the closing circuit B
Similarly to the case of the transistor 70b,
ON, OFF, to cut off and the tripping current I ₂ flows releasing the coil 52T to the transistor 70b.

The resistors 76 and 77 and the transistor 70c of the closing circuit A form a pumping prevention circuit.
Without this circuit, if the closing command switch CS1 and the breaking command switch CS2 are kept on, the circuit breaker will repeat the closing and tripping operations endlessly.

As the operation of the pumping prevention circuit, when the closing command switch CS1 is turned on, the circuit breaker is turned on and the contact 52b is turned off. In this state, if the ON state of the closing command switch CS1 continues, the transistor 7
Since 0a is off, the power supply voltage is applied to the series circuit of the resistors 66 and 67, the base voltage is applied to the transistor 70c, and the transistor 70c is turned on. Thereafter, on the closing command switch CS1 is the cut-off command switch CS2 in continuous state turned on and breaker interrupting becomes again contacts 5 ² b on state. However, since the transistor 70c is on, the transistor 70a
No voltage is applied to the base electrode of
Since a does not turn on, the closing operation is not executed, and the pumping operation is prevented.

According to the switch operation control device of the above embodiment, the same effect as that of the embodiment of FIG. 1 can be obtained, and in the closing circuit and the breaking circuit, the closing coil, the tripping coil and the auxiliary switch are used. Other than the above, all can be made into a printed circuit board, and wiring can be saved.

[0035]

The present invention is as described above, and includes a closing command switch for issuing a closing command, a closing coil connected in series to the closing command switch, and a repetition prevention device which is energized in response to the closing command. A normally-closed contact of a relay, a normally-closed contact of a motor operating electromagnetic contactor for operating a closing spring accumulating motor for accumulating the closing spring, and an auxiliary contact of a circuit breaker. Including a contact circuit connected, a closing circuit for controlling the closing operation, a breaking command switch for issuing a breaking command, and a tripping coil connected to the breaking command switch in series via an auxiliary contact of the breaker, In an operation control device having a breaking circuit for controlling the breaking operation, when breaking a control coil current at the time of switching control, instead of a conventionally used auxiliary switch, a switch is used. Using an element, also contacts of the auxiliary switch are used earnestly input and the gate current of the switching element,
Since the interruption of the control coil current is performed by the switching element, the control current capacity can be reduced, and an operation control device having a long life and a reduced size can be obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a switch operation control device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a switch operation control device according to another embodiment of the present invention.

FIG. 3 is a circuit diagram of a conventional switch operation control device.

FIG. 4 is a developed configuration diagram of a circuit breaker operating device.

[Explanation of symbols]

 52a, 52b: Breaker auxiliary contacts 52C: Making coil 52T: Tripping coil 52Y: Repetition prevention relay 52Yb: Contacts 70a to 70c: Transistors 71a, 71b: Resistors 72a, 72b: Resistors 73a, 73b: Resistors 76, 77 ... Resistance A: closing circuit C: shutoff circuit

Continuation of the front page (56) References JP-A-4-190522 (JP, A) JP-A 52-65838 (JP, U) JP-A 1-68638 (JP, U) JP-A 2-12129 (JP , U) Hikaru Hei 5-83977 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 33/28-33/59

Claims (2)

(57) [Claims] The breaking operation and the closing operation of a breaker are performed by a spring mechanism of a breaking spring and a closing spring via a link mechanism, respectively, and the storing of the closing spring is performed by a closing spring storing motor. In the operation control device for a switch, a closing command switch for issuing a closing command, a closing coil connected in series to the closing command switch, a semiconductor switching element connected in series to the closing coil, and a serial connection to the semiconductor switching element. A normally closed contact of a repeat prevention relay that is connected and energized in response to a turn-on command, and a series circuit that serially connects a resistor and an auxiliary contact of a circuit breaker to control on / off of the semiconductor switching element; A closing circuit for controlling a closing operation, a shutoff command switch for issuing a shutoff command, and a pull-down switch connected in series to the shutoff command switch. A switching circuit connected in series with the trip coil, a series circuit in which an auxiliary contact and a resistor of a circuit breaker are connected in series to control ON / OFF of the semiconductor switching element. An operation control device for a switch, wherein the operation control device is constituted by a control interruption circuit. 2. A breaking operation and a closing operation of a breaker are performed by a spring mechanism of a breaking spring and a closing spring via a link mechanism, respectively, and the charging of the closing spring is performed by a closing spring storing motor. In an operation control device for a switch, a closing command switch for issuing a closing command, a closing coil connected in series to the closing command switch, a semiconductor switching element connected in series to the closing coil, and an auxiliary contact of a circuit breaker. A series circuit in which resistors are connected in series to control on / off of the semiconductor switching element; a resistor circuit and a control electrode connected in parallel to the switching element are connected to a voltage dividing point of the resistor circuit; A closing circuit for controlling the closing operation, comprising a repetition prevention circuit comprising a semiconductor switching connected in parallel to a resistance element of the circuit; A disconnection command switch for issuing a disconnection command, a tripping coil connected in series to the disconnection command switch, a semiconductor switching element connected in series to the tripping coil, and an auxiliary contact and a resistor of a circuit breaker are connected in series. An operation control device for a switch, comprising a series circuit for controlling on / off of the semiconductor switching element, and a breaking circuit for controlling the breaking operation.