JP6239278B2 - Switch operating circuit - Google Patents

Description

  The present invention relates to an operation circuit of a switch controlled by a distribution switch section switch slave station.

  In a general wiring system, a distribution line drawn from a substation or the like is divided by a plurality of switches. Each switch is controlled by a respective slave station. The slave station controls and monitors the switch according to a command from a distribution automation control device (master station) installed in a sales office of an electric power company or the like (see, for example, Patent Document 1).

  In such a switch controlled by the control of the slave station, a delay open circuit is incorporated so as not to cut off the short-circuit current, and a non-voltage delay open time is secured. For this reason, a general switch does not support high-speed interruption.

  In addition, a switch having an immediate disconnection circuit has been studied (see Patent Documents 2 and 3). In the quick disconnect circuit of the automatic switch described in Patent Document 2, high-speed disconnection is realized by using two relay switches having a predetermined time difference. Moreover, in the automatic switch described in Patent Document 3, the delay opening and the quick disconnect function are realized by disconnecting the delay circuit from the connection by two relay switches.

JP 2011-72108 A JP-A-2-234322 JP 2008-181843 A

  In the prior art, two relay switches having a predetermined time difference are used, or delay circuit connection and disconnection are realized by two relay switches for delay release and quick disconnection function. In some cases, a normally closed switch for high-speed shutoff is provided, a diode is provided on the power supply side, and a relay switch is provided on the load side.

  However, when two relay switches are used, the equipment becomes large and the cost increases. Furthermore, operation coordination between the two relays is necessary, and it is difficult to ensure quality. Further, when the delay release function is provided on the slave station side, the circuit becomes complicated and the cost is high, and it is difficult to ensure the quality such as cooperation with the switch side.

  Furthermore, even in a switch that supports high-speed disconnection, quick disconnection may not be realized depending on the operating condition of the contacts. For example, in an operation circuit with a delay opening using a normally closed contact relay and a high-speed shut-off function, if the return voltage of the relay is higher than the return voltage of the switch body, the switch will not turn off even if the operation voltage is lowered. There was a need to sort the characteristics of the relay. For this reason, a general-purpose product cannot be adopted, resulting in high costs. Further, since the relay switch is a normally closed contact, the coil of the relay is normally in an excited state, and the life of the part may be shortened.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an operation circuit capable of performing an open delay and a high-speed cutoff with a simple configuration.

  The operation circuit of the switch that solves the above-mentioned problem is provided with a rectifying element having a cathode connected to the high voltage side of the operating voltage and an anode connected to the low voltage side, and a high-speed cutoff switch on the load side of the rectifying element, Between the high-pressure side and the low-pressure side, a normally open relay switch connected in series with a closing portion for closing the switch and a holding portion that holds the closing state, and connected in parallel to the holding portion; A delay circuit for operating the relay switch is provided in parallel with the input unit and the holding unit. Thereby, in a switch, an open delay can be carried out at the time of a no-voltage, or it can interrupt at high speed. Further, the relay coil is normally in a non-excited state, and the life of the relay can be extended.

  In the delay circuit, in the delay circuit, a relay and a capacitor connected in series between the high-voltage side and the low-voltage side, a resistor is provided in parallel with the relay and the capacitor, and the relay switch is connected by the relay. It is preferable to operate. Thereby, the relay switch can be operated regardless of the return voltage characteristics of the relay.

  The operation circuit of the switch is preferably connected to both ends of the relay with a first rectifier element and a resistor having an anode connected to the high voltage side. As a result, the relay can be bypassed and the capacitor can be charged during the closing operation, so that malfunction of the relay can be suppressed.

  In the operation circuit of the switch, it is preferable that a second rectifying element having an anode connected to the high voltage side is provided between the relay and the high voltage side. Thereby, the backflow of the current from the delay circuit to the high voltage side can be suppressed.

  The operation circuit of the switch is preferably provided with a normally closed switch that is linked to the operation of the switch in parallel with the relay switch. As a result, when the switch is started to be turned on, the holding coil can be bypassed and the switch can be turned on by exciting the closing coil.

  According to the present invention, an open delay and a high-speed cutoff can be performed with a simple configuration.

The circuit block diagram of the operation circuit of the switch of this embodiment. Operation | movement explanatory drawing at the time of the start of injection | throwing-in of the operation circuit of the switch of this embodiment. Operation | movement explanatory drawing at the time of holding | maintenance of the operation circuit of the switch of this embodiment. Operation | movement explanatory drawing at the time of delay open | release of the operation circuit of the switch of this embodiment. Operation | movement explanatory drawing at the time of the high-speed interruption | blocking of the operation circuit of the switch of this embodiment. The time chart at the time of delay opening of the operation circuit of the switch of this embodiment. The circuit block diagram of the operation circuit of the switch of other embodiment.

  Hereinafter, an embodiment of an operation circuit of a switch will be described with reference to FIGS. A plurality of such switches are provided in series on a distribution line from a substation or the like. The switch has a main unit with a main contact that opens and closes the distribution line, and an operation unit, and is controlled by a switch slave station (hereinafter referred to as “slave station”) connected to each switch. Is done. The slave station controls and monitors the switch according to a command from a distribution automation control device (master station) (not shown) installed in a sales office of an electric power company or the like.

<Operation circuit configuration>
As shown in FIG. 1, the operation circuit of the present embodiment includes an operation unit of the slave station 10 and an operation unit of the switch 20 that are connected to each other by a two-core cable. In this embodiment, the terminals 10a and 10b of the slave station 10 and the terminals 20a and 20b of the switch 20 are connected. The operation voltage V is supplied with the terminal 10a of the slave station 10 as the high voltage side and the terminal 10b as the low voltage side.

  The slave station 10 that supplies the operating voltage V to the switch 20 is provided with quick contact switches 11a and 11b between the terminals 10a and 10b, respectively. The quick contact switches 11a and 11b are high-speed cutoff switches that are normally closed and open when a high-speed cutoff instruction is received from the master station. Furthermore, with respect to the quick contact switches 11a and 11b, a diode 12 having a cathode connected to the terminal 10a and an anode connected to the terminal 10b is provided on the power supply side. The diode 12 is a rectifying element, and an operation voltage V is applied to both ends when the diode 12 is turned on.

  Between the terminals 20a and 20b of the switch 20, a holding coil 21 as a holding unit that holds the closing state and a closing coil 22 as a closing unit are connected in series. The inductance of the holding coil 21 is larger than the inductance of the closing coil 22. The main contact is turned on by exciting the closing coil 22 to pass a current through the distribution line, and the main contact is turned on by exciting the holding coil 21 to continue feeding the distribution line.

  Further, a relay switch 23 and a b contact 24 are connected to both ends of the holding coil 21 so as to be in parallel with the holding coil 21. The b contact 24 functions as a normally closed switch, and is opened when the switch is operated and turned on.

  The relay switch 23 is a switch that interlocks with a relay 34 described later. In this embodiment, by using a normally open switch (a contact), the open state is caused by a voltage drop between the terminals 20a and 20b.

  Further, the switch 20 is provided with a delay circuit 30 including diodes 31 and 32, a relay 34, a capacitor 35, and resistors 33 and 36. In the delay circuit 30, a relay 34 is connected to the terminal 20a via a diode 31 (first rectifier element). The diode 31 has an anode connected to the terminal 20 a and a cathode connected to the relay 34. The anode of the diode 32 (second rectifying element) is connected in parallel with the relay 34 to the cathode of the diode 31. A resistor 33 is connected to the cathode of the diode 32. The diodes 31 and 32 function to prevent backflow, and the resistor 33 functions to prevent relay operation during the closing operation. For this reason, the resistor 33 having a resistance value lower than that of the relay 34 is used. The resistor 33 and the relay 34 are connected to the terminal 20b via the capacitor 35.

  Further, the delay circuit 30 includes a resistor 36 connected in parallel to the relay 34 and the capacitor 35 between the cathode of the diode 31 and the terminal 20b. The resistor 36 functions as a delay opening for flowing a current by the electric charge accumulated in the capacitor 35. The resistor 36 has a resistance value that can operate the relay 34 for a time longer than the delay open period.

<Operation circuit operation>
Next, the operation of the operation circuit will be described with reference to FIGS. In the present embodiment, description will be made in the order of start of loading, holding, delay release, and high-speed cutoff.

  First, referring to FIG. 2, a description will be given of the start of charging. At the start of charging, the quick contact switches 11a, 11b and b contact 24 are closed, and the operating voltage V is applied to the power supply side of the slave station 10. Thereby, in this operation circuit, the current I from the power supply side is supplied to the terminal 20a via the quick contact switch 11a and the terminal 10a. The current I supplied to the terminal 20a is supplied to the diode 31 and the b contact 24. Further, the current I1 supplied to the b contact 24 is supplied to the making coil 22. These currents flow through the terminals 20b and 10b and the quick contact switch 11b.

The current I2 supplied to the diode 31 is used for charging the capacitor 35 via the diode 32 and the resistor 33. When the capacitor 35 is charged to the operating voltage V, the current supply to the diode 31 is stopped.
The making coil 22 is excited by the current I1, operates the contact of the switch, and turns on the switch. When the charging is completed, the main contact is closed and the b contact 24 is opened.

  In the time chart shown in FIG. 6, it is assumed that the operating voltage V is applied at time t1. In this case, a current I1 for exciting the making coil 22 flows from the terminal 20a, and a current I2 flows in the delay circuit 30. In the delay circuit 30, the current I 2 charges the capacitor 35 via the diode 32 and the resistor 33. Therefore, the relay 34 is bypassed and the relay switch 23 does not operate. Then, when the charging of the capacitor 35 is finished, the current I2 is attenuated.

  Next, the case of holding will be described with reference to FIG. During this holding, the b contact 24 is in an open state. Since the state in which the operating voltage V is applied to the power supply side of the slave station 10 is maintained, the current I1 from the power supply side is supplied to the quick contact switch 11a, the terminals 10a and 20a, the holding coil 21, the closing coil 22, It flows through the terminals 20b and 10b and the quick contact switch 11b. The holding coil 21 is excited by this current.

  In the time chart shown in FIG. 6, the switch is turned on by excitation of the making coil 22 at time t2. In this case, since the current I1 is supplied to the holding coil 21 together with the making coil 22, it becomes smaller than that at the beginning of making.

  Next, the case of delay release will be described with reference to FIG. At the time of delay release, the power supply of the slave station 10 decreases and finally becomes no voltage. Since the switch is in the on state, the b contact 24 is in the open state. When the operating voltage decreases and becomes lower than the charging voltage of the capacitor 35, current is supplied from the capacitor 35 to the relay 34 and the resistor 36. Then, the relay 34 operates and the relay switch 23 is closed. In this case, the current Ic flows through the closing coil 22, the terminals 20b and 10b, the quick contact switch 11b, the diode 12, the quick contact switch 11a, the terminals 10a and 20a, and the relay switch 23 by the energy accumulated in the closing coil 22. The current Ic is attenuated as time passes. Then, after a predetermined time (delay open period) elapses, the excited state cannot be maintained, and the switch is opened.

  Here, in the time chart shown in FIG. 6, it is assumed that the operating voltage V decreases at time t3. In this case, the electric charge accumulated in the capacitor 35 is released through the relay 34 and the resistor 36. The switch is opened at time t4 when the closing coil 22 can no longer maintain the excited state.

  Next, a description will be given of the case of high-speed shut-off with reference to FIG. At the time of this high-speed interruption, the quick contact switches 11a and 11b are opened. Thereby, the diode 12 and the circuit of the slave station 10 are disconnected. Therefore, in this operation circuit, since the closed loop is cut, a current based on the energy accumulated in the coil does not flow, and the holding coil 21 and the closing coil 22 are de-energized. Thereby, the main contact of switch 20 is interrupted at high speed.

According to the operation circuit of the present embodiment, the following effects can be obtained.
(1) In this embodiment, quick contact switches 11a and 11b are provided on the power supply side of the holding coil 21, respectively. The quick contact switches 11a and 11b are normally closed and open when performing high-speed shut-off. Further, a relay switch 23 that opens when there is no voltage is connected in parallel with the holding coil 21 and a diode 12 is provided on the power supply side of the quick contact switches 11a and 11b. Thereby, it is possible to delay the opening of the switch 20 at the time of no voltage or to shut off at high speed by using one relay switch 23.

  (2) In the present embodiment, a normally open switch is used as the relay switch 23. As a result, the coil of the relay 34 is normally in a non-excited state, and the life of the relay can be extended.

  (3) In the present embodiment, the capacitor 35 is provided in series with the relay 34. Thereby, the relay switch 23 can be operated regardless of the return voltage characteristics of the relay 34. Therefore, since a versatile relay can be adopted, the cost can be reduced.

  (4) In this embodiment, the diode 32 and the resistor 33 are connected in parallel to both ends of the relay 34. The anode of the diode 32 is connected to the high voltage side, and the cathode is connected to the low voltage side. Thereby, at the time of making operation, the relay 34 can be bypassed and the capacitor 35 can be charged, so that malfunction of the relay 34 can be suppressed.

(5) In the present embodiment, the delay circuit 30 includes a diode 31. Thereby, the backflow of the current from the delay circuit 30 to the high voltage side can be suppressed.
(6) In the present embodiment, the relay switch 23 and the b contact 24 are connected to both ends of the holding coil 21 so as to be in parallel with the holding coil 21. As a result, the holding coil 21 can be bypassed and the main contact can be turned on by exciting the closing coil 22 at the start of turning on the switch.

Further, the above embodiments may be modified as follows.
In the above embodiment, the quick contact switches 11a and 11b are provided in the slave station 10. The position of the quick contact switch is not limited to this.
For example, as shown in FIG. In this case, the diode 12 is provided closer to the terminals 20a and 20b than the quick contact switches 11a and 11b.

  In the above-described embodiment, the relay switch 23 is used. However, any switch that can be delayed and opened may be used, and a switch with a timer that is opened after a predetermined time from no voltage can be used.

  In the above embodiment, a pair of quick contact switches 11a and 11b are provided as high-speed cutoff switches. However, the number of switches is not limited to this as long as it is a switch that disconnects a closed loop through which current Ic flows.

  In the above embodiment, the b contact 24 is provided. By providing the relay switch 23 with a shut-off function capable of switching on and holding, the b-contact can be omitted.

  DESCRIPTION OF SYMBOLS 10 ... Slave station, 11a, 11b ... Quick contact switch, 10a, 10b ... Terminal, 12 ... Diode, 20 ... Switch, 20a, 20b ... Terminal, 21 ... Holding coil, 22 ... Input coil, 23 ... Relay switch, 30 ... delay circuit 31, 32 ... diode, 33 ... resistor, 34 ... relay, 35 ... capacitor, 36 ... resistor.

Claims (4)

A rectifying element having a cathode connected to the high voltage side of the operating voltage and an anode connected to the low voltage side;
A high-speed cutoff switch is provided on the load side of the rectifying element,
Between the high-pressure side and the low-pressure side, a charging unit for charging the switch, and a holding unit for holding the charging state are connected in series,
Provide a normally open relay switch connected in parallel to the holding unit,
A delay circuit for operating the relay switch is provided in parallel with the input unit and the holding unit ,
In the delay circuit,
A relay and a capacitor connected in series between the high voltage side and the low voltage side;
Provide a resistor connected in parallel to the relay and capacitor,
An operation circuit for a switch, wherein the relay switch is operated by the relay . 2. The switch operating circuit according to claim 1, wherein a first rectifier element and a resistor having an anode connected to the high voltage side are further connected to both ends of the relay. The switch operating circuit according to claim 1 or 2 , wherein a second rectifying element having an anode connected to the high voltage side is provided between the relay and the high voltage side. A rectifying element having a cathode connected to the high voltage side of the operating voltage and an anode connected to the low voltage side;
A high-speed cutoff switch is provided on the load side of the rectifying element,
Between the high-pressure side and the low-pressure side, a charging unit for charging the switch, and a holding unit for holding the charging state are connected in series,
Provide a normally open relay switch connected in parallel to the holding unit,
A delay circuit for operating the relay switch is provided in parallel with the input unit and the holding unit,
Operation circuit that opens閉器be characterized by a normally closed switch that works with the operation of the switch is provided in parallel with the relay switch.

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