JP2000278886A - Distribution line sectioning switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breakage, etc., of a controller caused by the shunted current of a large current, such as the lightning surge current, etc. SOLUTION: A switch power supply section 34 which forms the DC operating power of a switch 31 by dropping the voltage of System power supplied through a distribution line 2 is installed to the switch 31. In addition, radio communication means (37 and 41) which transmit and receive signals on control information exchanged between the switch 31 and a Controller 40 after converting the signals into radio signals are respectively installed to the switch 31 and controller 40, and the switch 31 and controller 40 are electrically insulated from each other. Moreover, the controller 40 is cut off from the grounding path of the switch 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution line switchgear.

[0002]

2. Description of the Related Art Conventionally, a distribution line section switchgear is formed by a switch (section switch) for dividing a distribution line and a control device for controlling the opening and closing thereof.
It consists of a so-called switch slave station.

[0003] When an accidental power failure occurs, the progressive charging from the substation is repeated, and the switch in the accident section is locked in the open state to restore each healthy section on the substation side from the accident section. Sending information such as the open / closed state of the switch of its own station from the switch slave station to a master station (base station) for remote monitoring control such as a business office of a power company via a communication cable or a distribution line;
The accident section is detected and identified by the master station.

[0004] In this case, since the test section is repeatedly charged and the accident section is separated, the sound section cannot be restored immediately after the accident blackout, and the sound section is repeatedly cut off by the test charging after the accident blackout.

Accordingly, the present applicant has filed Japanese Patent Application No. Hei 9-14570.
Has already invented a distribution line automatic section switchgear 1 having a configuration shown in FIG.

[0006] The automatic distribution line switchgear 1 of FIG. 6 includes, for example, a three-phase switch 3 for separating a non-loop 6.6 KV distribution line 2 and a controller 4 for controlling the opening and closing of the switch 3. It is formed.

The switch 3 includes main circuit contacts 5a, 5b, and 5c for each of the phases A, B, and C, an auxiliary contact 6 for display, and a closing coil 7 for these contacts 5a to 5c and 6. .

The control unit 4 supplies the power supply circuit 9 with a single-phase drive power (control power) as a single-phase drive power by the control power transformer 8, for example, between the A and C phase line voltages of the distribution line 2.
When the system is normal, it operates with the DC power supply of the power supply circuit 9 based on the control power supply.

Further, a power failure backup circuit 11 of a backup power supply unit 10 is connected to the power supply circuit 9, and when the system is normal, the secondary battery 12 of the power failure backup circuit 11 is charged by the control power supply of the transformer 8, and the distribution line 2 is damaged. When a power outage occurs, the secondary battery 12 supplies power to each part of the switchgear 1 as backup power.

The control unit 4 has a control processing unit 13 having a microcomputer configuration. The control processing unit 13 has a bus 14, a memory 14, a control output circuit 15, a display input circuit 16 and a serial interface 17 for communication. The control processing unit 13 monitors the system current or the like in the section on the load side of the switch 3 based on a measurement signal of a sensor such as a current transformer (not shown), and detects a current (phase current) in any one of the distribution lines 2. Is larger than the set value, the occurrence of overcurrent is detected and the occurrence is stored in the memory 14.

On the other hand, when an overcurrent occurs on the load side, the switch 3 opens the contacts 5a to 5c and 6 to interrupt the power supply on the load side.

Further, when the DC operation power supply from the control output circuit 15 is turned on and off, an on / off command is issued and the contact 5 is turned on.
a to 5c and 6 are input and released.

Further, a contact signal of the auxiliary contact 6 is transmitted to the display input circuit 16 as a status display signal.

The control processing unit 13 grasps the open / closed state of the switch 3 based on the state display signal transmitted to the display input circuit 16.

Next, a communication line 20 is connected to the serial interface 17 via a communication modem 18 and a coupler 19, and the control processing unit 13 keeps the communication line 20 connected even during a power failure of the distribution line 2.
And communicates with the control processing unit 13 of the control device 4 in the adjacent section on the load side via the PC to obtain information such as overcurrent in the adjacent section on the load side.

When the distribution line 2 is out of power, if the own section has overcurrent information stored therein and the adjacent section on the load side does not have overcurrent information stored therein, it is determined that an accident has occurred in the own section. Then, before the circuit breaker of the substation is reclosed by the trial charging, the switch 3 of the own section is opened and locked.

In this case, before re-inputting the circuit breaker of the substation,
Since the switch 3 in the accident section is locked in the open state and the accident section is automatically disconnected from the system, a power failure due to trial charging does not occur, and each sound section upstream from the accident section is immediately restored.

By the way, in this type of conventional distribution line switchgear, even when the control device 4 is provided with a switchgear slave station, the power supply of the switchgear 3 is supplied from the transformer 8 connected to the distribution line 2 to the switchgear. Supplied via slave station. Also, it is usually mounted on a utility pole and grounded as shown in FIG. 7 or FIG.

FIGS. 7 and 8 show grounding states of the switchgear 1 of FIG. 6 at the time of mounting on a pole. The distribution line 2 installed on the upper part of the power pole is a power supply side end 2a and a load side end of the switchgear 3. 2b is connected to lightning arresters (arrestors) 21a and 21b,
1a and 21b are grounded via a high-voltage side ground wire 22.

The communication line 20 is suspended from the messenger wire 24 via a support ring 23 at an appropriate interval.
This wire 24 is grounded via a low voltage side ground wire 25.

Further, in FIG. 7, the switch 3, the control device 4, and the transformer 8 are connected to the high-voltage side grounding line 22 via individual grounding lines 26, 27, 28, and are grounded via this grounding line 22. 8, the ground lines 26 and 28 are connected to a ground terminal or the like of the control device 4, and the ground line 27 is connected via the high-voltage side ground line 22.

Reference numeral 29 in the figure denotes a three-phase four-wire (V connection) low-voltage power distribution light line installed below the distribution line 2.

Also, in the case of a distribution line switchgear provided with a switch slave station, grounding similar to that shown in FIGS. 7 and 8 is performed.

[0024]

In the case of this type of conventional distribution line switchgear, the switchgear 3 and the control device 4 are electrically connected as shown in FIGS. The control device 4 and the transformer 8 are grounded using the high-voltage side ground line 22 as a common ground path.

For this reason, when a lightning surge current of a large current flows through the high-voltage side ground line 22 due to a lightning strike as shown by the arrow lines a and b in FIGS. There is a problem that the current is shunted through the transformer 8 to the control device 4 that is a low-voltage device or a switch substation, and these low-voltage devices are damaged.

The present invention relates to a control device (control device 4, switch slave station) for shunting a large current such as a lightning surge current due to a lightning strike.
An object of the present invention is to prevent breakage or the like.

[0027]

In order to solve the above-mentioned problems, a distribution line switchgear according to the present invention, in the case of claim 1, reduces the system power supply of the distribution line to the switch, and A switch power supply unit that forms a DC operation power supply is provided, and the switch and the control device are provided with wireless communication means for converting a signal of control information exchanged between the switch and the control device into a wireless signal and transmitting and receiving the signal. Then, the switch and the control device are electrically insulated and separated from each other, and the control device is separated from the ground path of the switch.

Therefore, even if a large current such as a lightning surge current flows through the high-voltage side ground wire of a utility pole, which is a ground path of the switch, the current is transmitted to the control device by electrically isolating the switch from the control device. Since the flow is not divided, the control device is prevented from being damaged.

Also, in the case of claim 2, an optical communication interface unit is provided in place of both wireless communication means of claim 1,
The switch and the control device are connected by an optical signal transmission means such as an optical fiber, and the switch and the control device are electrically insulated and separated from each other, and the control device is separated from the ground path of the switch.

Therefore, also in this case, a large current such as a lightning surge current is not diverted to the control device, thereby preventing the control device from being damaged.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
This will be described with reference to FIG. (1) First Embodiment of the Present Invention According to Claim 1
The configuration will be described with reference to FIGS. FIG.
Is an automatic distribution line switchgear 3 similar to the switchgear 1 of FIG.
The switchgear 30 rectifies the power supply transformer 32 connected to the distribution line 2 and the secondary output of the transformer 32 to a switchgear (segmented switchgear) 31 corresponding to the switchgear 3 in FIG. Rectifier circuit 33 of a diode full bridge circuit configuration for forming a DC operation power supply such as an operation power supply for switch 31
And a wireless communication unit 37 formed by a transmission / reception circuit unit 35 and a transmission / reception antenna 36.

The power supply unit 34 forms a DC operating power supply as a drive power supply for each unit of the switch 31, and this power supply is transmitted to the transmission / reception circuit unit 35 via the voltage dividing circuit of the resistors 38 a and 38 b and the rectifying diode 39. Powered.

A control device 40 for automatic sorting opening / closing control corresponding to the control device 4 of FIG. 6 operates by being supplied with, for example, a single-phase 100 V power supply from the power line 9 to the power supply circuit 9.
A wireless communication unit 41 corresponding to the wireless communication unit 37 is provided.

The wireless communication means 41 includes a transmission / reception circuit unit 4
3 and an antenna 43 for transmission and reception. Next, the transmission / reception circuit units 35 and 42 are configured, for example, as shown in FIG.

The transmission / reception circuit unit 35 transmits the contact signal of the auxiliary contact 6 to the resistors 44a and 44b and the buffer amplifier 45.
To the transmission output circuit 46 via the
, A control information signal such as a status display signal of the switch 31 is converted into a transmission signal of an appropriate modulation format and frequency.
Send to 1.

When a radio reception signal having a frequency (band) different from that of the transmission signal is received by the antenna 36, the reception signal is detected (demodulated) by a detection circuit (demodulation circuit) 47.
The demodulated output is supplied to the base of a driver transistor 49 via a buffer amplifier 48, and the ON / OFF state of the transistor 49 controls the energization of a closing auxiliary relay 50. 7 is controlled, and the closing of the switch 31 is controlled.

On the other hand, the control device 40 is provided with a control output circuit 52 instead of the control output circuit 15 of FIG. 6, and this circuit 52 forms a signal of an opening / closing command of the switch 31 as a signal of the control information, This signal is supplied to the transmission output circuit 54 via the buffer amplifier 53 of the transmission / reception circuit unit 42, and is converted into a radio transmission signal received by the antenna 36 by the output circuit 54. I do.

The radio signal received by the antenna 43 from the antenna 36 is detected (demodulated) by the detection circuit 55, and the demodulated output is supplied to the display input circuit 16 via the buffer amplifier 55.

Accordingly, the switch 37 and the control device 40 are electrically insulated and separated from each other, and the switch 32 operates on the system power supply of the distribution line 2 via the built-in transformer 32, and the control device 4
0 operates on the low voltage power supply of the power line 29 separate from the distribution line 2,
The transformer 8 in FIG. 6 is omitted.

When the switch 31 is mounted, as shown in the grounding connection diagram of FIG. 3, the switch 31 is connected to the ground line 57 via the high-voltage side ground line 22.
Is not connected to the high-voltage side ground wire 22, is disconnected from the ground path of the switch 3, and is kept in an ungrounded state.

Therefore, as shown by the arrow C in FIG.
Even if a large lightning surge current or the like flows through the high-voltage side ground line 22, the current does not shunt to the control device 40, thereby preventing damage or the like.

(Other Embodiment) Next, another embodiment of the present invention corresponding to claim 2 will be described with reference to FIGS. The automatic distribution line switchgear 58 shown in FIG.
2 is different from the automatic distribution switchgear 30 of FIG. 2 in that the switch 31 and the controller 40 are replaced by the optical communication interface units 59 and 60 instead of the wireless communication means 37 and 42 of FIGS. And a pair of optical fibers 61 and 62 as optical signal transmission means between the interface units 59 and 60.
And the switch 31 and the control device 40 are connected to the optical fiber 6.
1 and 62 are electrically insulated and connected.

In the optical communication interface section 59 of the switch 31, for example, a light emitting diode 64 of infrared light is connected to the auxiliary contact 6 via a resistor 63, and the contact signal of the auxiliary contact 6 is transmitted by the light emitting diode 64. The optical signal is converted to a signal and transmitted to the optical communication interface unit 60 of the control device 41 via the optical fiber 61.

Further, an optical signal transmitted from the optical communication interface unit 60 via the optical fiber 62 is received by the phototransistor 65 and converted into an electric signal, and the phototransistor 65 is turned on and off based on this conversion. The energization of the auxiliary relay 50 is controlled to control the opening and closing of the contact 51.

On the other hand, the optical communication interface unit 60 of the control device 41 converts the signal of the opening / closing command of the control output circuit 52 into an optical signal of, for example, infrared light by the photodiode 66 and converts this optical signal to the optical fiber 62. The signal is transmitted to the optical communication interface unit 59 via the interface.

The optical signal transmitted from the optical communication interface 59 via the optical fiber 61 is received by the phototransistor 67 and converted into an electric signal, and the electric signal is supplied to the display input circuit 16.

Therefore, in this embodiment, the switch 31 and the control device 41 are electrically insulated and connected by the optical fibers 61 and 62.

When mounted, the switch 31 is connected to the high-voltage side ground wire 22 as shown in the grounding connection diagram of FIG.
The control device 40 is connected to the high voltage side ground line 2
2 is disconnected from the ground path of the switch 31 and is kept in a non-ground state.

Therefore, as shown by the arrow line d in FIG.
As in the case of the first embodiment, a large current such as a lightning surge current is not shunted to the control device 40, so that damage or the like is prevented.

By the way, in both of the above embodiments,
Although applied to an automatic distribution line switchgear that locks the switch 31 in the accident section to the open state during the power outage of the distribution line 2,
Needless to say, the present invention can be similarly applied to a distribution line switchgear having a switch slave station instead of the controller 40.

The configuration of the wireless communication means and the optical communication interface may be any, and the optical signal transmission means may be other than an optical fiber.

The present invention can be applied to various distribution line switching devices such as high-voltage and extra-high-voltage distribution lines.

[0053]

The present invention has the following effects. First, in the case of the distribution line switchgear of claim 1, the exchange of control information signals between the switchgear 31 and the control device 40 is performed by radio signals, and the switchgear 31 has a built-in switchgear power supply unit 34. Since the switch 31 and the control device 40 are electrically insulated and separated from each other and the control device 40 is separated from the ground path of the switch 31,
Large current such as lightning surge current due to lightning strike during mounting
Even if the current flows through the first ground path (high-voltage side ground line 22), this current does not diverge to the control device 40, and damage to the control device 40 is prevented, and reliability can be improved.

In the case of the distribution line switchgear according to the second aspect, the switchgear 31 and the control device 40 are provided with optical communication interfaces 59 and 60, and a signal of control information between the switchgear 3 and the control device 40 is provided. Is exchanged by optical signals by optical signal transmission means such as optical fibers 61 and 62,
As in the case of the first aspect, the switch 31 and the control device 40 are electrically insulated and separated from each other, thereby preventing damage to the control device 40 due to shunting of a large current such as a lightning surge current and improving reliability. Can be planned.

[Brief description of the drawings]

FIG. 1 is a block connection diagram of an embodiment of the present invention.

FIG. 2 is a detailed block connection diagram of a part of FIG. 1;

FIG. 3 is a single-line diagram showing a grounded state at the time of mounting the pole in FIG. 1;

FIG. 4 is a block connection diagram of another embodiment of the present invention.

FIG. 5 is a single-line connection diagram showing a grounding state at the time of mounting the pole in FIG. 2;

FIG. 6 is a block connection diagram of a conventional device.

7 is a single-line diagram showing an example of a ground state at the time of mounting the pole in FIG. 6; FIG.

FIG. 8 is a single-line diagram showing another example of the grounding state at the time of mounting the pole in FIG. 6;

[Explanation of symbols]

 Reference Signs List 2 distribution line 3 switch 4 control device 34 switch power supply unit 37, 41 wireless communication means 59, 60 optical communication interface unit 61, 62 optical fiber

Claims (2)

[Claims] 1. A distribution line switchgear formed by a switch for dividing a distribution line and a control device for controlling opening and closing of the switch, wherein the system power supply of the distribution line is stepped down by the switch. Providing a switch power supply unit for forming a DC operation power supply of the switch, converting a signal of control information exchanged between the switch and the control device into a radio signal to the switch and the control device. A distribution line section, wherein the switch and the control device are electrically insulated and separated from each other, and the control device is separated from a ground path of the switch. Switchgear. 2. A distribution line division switchgear formed by a switch for dividing a distribution line, and a control device for controlling opening and closing of the switch, wherein the system power supply of the distribution line is stepped down by the switch. Providing a switch power supply unit for forming a DC operating power supply of the switch, converting a signal of control information exchanged between the switch and the control device into an optical signal to the switch and the control device. An optical communication interface unit for transmitting and receiving the optical signal is provided. The switch and the control device are connected by an optical signal transmission unit such as an optical fiber that transmits the optical signal, and the switch and the control device are electrically connected. A distribution line section switchgear, wherein the control device is electrically insulated and separated from the ground path of the switch.