JPH0447549B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for remotely centrally controlling a distribution line switch.

[Technical background of the invention and its problems]

Since distribution line switches (hereinafter referred to as switches) are distributed over a wide area, their opening/closing status is usually centrally monitored and controlled by a monitoring panel or the like via a remote control device. This has the advantage of being able to switch the distribution system quickly from the central location, but on the other hand, it is necessary to go to the site and directly operate the switches when constructing distribution lines or recovering from an accident. Therefore, a manual operation mechanism is provided in the switch or the remote control slave station so that the switch can be turned on and off by manual operation.

The manual operation mechanism for turning it on and off is the first
As shown in the figure. In the figure, 1 is a slave station of the remote control device,
Set the switch SW to the "off" position, disconnect the constantly excited switch 2 from the power supply 3, and open the switch 2.
Set the switch SW to the “on” position and use the remote control receiver R.
switch 2 and power supply 3 by bypassing the output contact K of
The switch 2 is turned on by connecting the

In other words, if the switch SW is set to the "on" or "off" position, the switch 2 will be turned on or off regardless of the state of the output contact K, which is moved by the remote control signal sent from the center via the transmission line 4. This means that you can control whether it is turned on or off.

Although the remote monitoring and control slave station 1 shown in FIG. 1 does not include a means for transmitting the "on" and "off" state signals of the switch 2 to the center, such a means is naturally provided. Assume that there is. Therefore, the ``on'' and ``off'' states of the switch 2 can be confirmed by the monitoring board provided in the center.

Let us now consider the case where construction is to be carried out in section F3 in a power distribution system as shown in Fig. 2. This system is divided into three sections F1, F2, and F3 at division points S1 and S2, where the distribution line, which is supplied with electricity from the distribution substation's breaker CB, is normally closed, and section F3 is normally open. It is connected to other distribution lines at loop point L. Segment points S1, S2, normally open loop point L
are assumed to be remotely controlled by devices such as those shown in FIG.

First, prior to construction, in order to cut off the power in section F3, the dividing point S2 is turned off, that is, the contact K is opened. After that, the worker at the site switched the demarcation point S2 and the normally open loop point L to ensure safety.
Start construction after changing the SW from the "remote control" position to the "off" position. This is to prevent electricity from being transmitted to the section F3 even if the dividing point S2 or the normally open loop point L is turned on by remote control by mistake during construction. After the construction is completed, the worker manually operates the switch SW at the dividing point S2 to the "ON" state on site to turn on the switch 2, in order to send electricity to section F3. Then, at the site, workers confirm that electricity is being transmitted to the construction area using street lights and portable voltmeters.
Request remote control by contacting the central office by phone or other means.
Then, from the center, the contact K of the dividing point S2 is controlled to be “ON”, and the contact K of the normally open loop point L is controlled to be “OFF”, and then each manual operation mechanism (switch) is controlled at the site.
The on-site operation is completed by returning the SW) to the remote control position shown in Figure 1.

If, contrary to the above order, the switch is switched from the "on" position to the "remote control" position before the output contact K is closed by the remote control, the central Until the contact K is closed, the switch 2 that was once turned on is opened, and the section F3 becomes in a power outage state again for a short time.

For this reason, conventionally, the first step was to switch the switch on-site.
to the "on" position (demarcation point S2) and the "off" position (normally open loop point L), and then before returning the switch SW to the "remote control" position in order to be able to perform control from the center. It was necessary to control the slave stations from the center to turn them on or off so that the output contact K of the remote control receiver R would match the position of the switch SW (on or off). A telephone or the like has been used as a means for aligning the position of the output contact K with the position of the switch SW.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and even if the division point S2 or the loop point L is controlled to turn on or off during construction, it will not work after the site operation after the construction is completed. The object of the present invention is to provide a control device for a power distribution switch that can be returned to its original state for remote control by only on-site operation without interconnection with the central power supply.

[Embodiments of the invention]

An embodiment of the present invention will be explained with reference to FIG.

The slave station 1 of the remote control device of the present invention has a remote control receiver R that outputs a pulse-like output of "on" or "off" in response to a remote control signal sent from a transmission line 4.
The output terminal is connected to the set input terminal of the holding circuit H via the OR circuit OR2, and the output contact K is held in the "on" state. On the other hand, the "off" output terminal of the remote control receiver R is connected to the reset input terminal of the holding circuit H via the OR circuit OR1, and the output contact K is held in the "off" state. Connect the common side of the manually operated switch SW to the drive power supply V _CC of the holding circuit H. The "off" side contact of the switch SW is OR circuit OR1
The "input" side contact is connected to the set input terminal of the holding circuit H via an OR circuit OR2.

In the above configuration, if the switch SW is manually set to the "ON" position, the drive power supply V _CC will be turned to the holding circuit H.
Since the holding circuit H turns the output contact K into the "on" state, the switch 2 is excited by the power supply 3 and turned on. Although the closed state of this switch can be confirmed at the center, let us consider a case in which the center transmits a remote control signal of "off" via the transmission line 4 due to an erroneous operation or the like. In this case, the remote control receiver R outputs a pulse-like output to the "off" output terminal, and the OR
A pulse-like input is applied to the reset input terminal of holding circuit H via circuit OR1, but the holding circuit is
Since the set input is continued by V _CC , the output contact K continues to be in the "on" state and is not remotely controlled. On the other hand, if the switch SW is set to the "off" position, the set signal of the holding circuit H disappears and a reset signal is input instead, so the reset state is established, K is set to the "off" state, and the switch 2 is opened. . In this state, even if it is controlled to be "on" by remote control from the center, the holding circuit H continues to be set by the drive power supply V _CC , so the output contact K is "off".
Continue the state.

When the switch SW is set to the "remote control" position, the drive power supply V _CC is not applied to the holding circuit H, so that it is driven by the output signal of the remote control receiver R. Therefore, when the center outputs an "off" control signal, a pulse-like output is output to the "off" output terminal, and a reset signal is input to the holding circuit H via the OR circuit OR1, turning the output contact K into the "off" state. do. On the other hand, when the center outputs an "in" remote control signal, the remote control receiver R outputs a pulse-like output to the "in" output terminal, and the holding circuit H receives the set signal via the OR circuit OR2, so it becomes an output contact. K
Turn on. That is, the switch 2 can be closed and opened by remote control.

Next, the slave stations in Figure 3 are connected to the division points S1 and S in Figure 2.
2. Consider the case where construction is to be carried out in section F3 in a system applied to permanently open loop point L. First, by the operation of the worker at the site, the division point S2 and the normally open loop point L are set.
Switch the switch SW from the "remote control" position to the "off" position. After the construction work is completed, in order to transmit power to section F3, switch SW of dividing point S2 is set to the "on" position, and a set input is applied to the holding circuit H, causing the output contact K to be in the "on" state, and the switch 2 is closed. , electricity is transmitted to section F3. If the worker at the site confirms that electricity is being transmitted using a street light or voltmeter, etc., and returns the switch SW to the "remote control" position, the set signal applied to the holding circuit H will disappear, but
Since the holding circuit H maintains the set state, the switch 2 returns to the state where it can be remotely controlled from the center while maintaining the closed state. Regarding the normally open loop point L, as mentioned above, the switch SW was changed from the "remote" position to the "off" position prior to construction, so the holding circuit H is in the reset state and the output contact is K remains in the "off" state. After the construction is completed, the worker turns off the switch SW at loop point L.
If the position is returned to the "remote control" position, the switch 2 at the normally open loop point L remains open and returns to the state where remote control is possible from the center.

In the above embodiment, the switch SW is built in the slave station 1 of the remote control device, but the same effect can be obtained even if the switch SW is built in the switch 2.

Furthermore, as shown in another embodiment in FIG. 4, the same effect can be obtained by switching the inputs with a switch SW instead of connecting the inputs to the holding circuit H with the OR circuits OR1 and OR2. The holding circuit may be an electrical flip-flop circuit or a mechanical one.

〔Effect of the invention〕

According to the present invention, in a power distribution system that can be centrally controlled by remote control, when a switch is manually turned on and off on site and then the control is returned to the central location,
Unlike the conventional technology, there is no need for manual operation in coordination with the central government, and the operation can be performed quickly.

In the above explanation, we used the example of construction work, but it is especially effective when dispatched to the site in the event of a distribution line accident and transmitting power while confirming the healthy sections, which can be done with only on-site operations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional device, FIG. 2 is a power distribution system diagram for explaining the operation, FIG. 3 is a block diagram showing an embodiment of the device of the present invention, and FIG. 4 is a block diagram of another device of the present invention. FIG. 2 is a block diagram showing an embodiment. 1...Slave station of remote control device, 2...Power distribution switch, H...Holding circuit, R...Remote control receiver, OR
1, OR2...OR circuit, SW...switch, K...
…Output contact, V _CC …Input drive power supply.

Claims (1)

[Claims] 1. In a system in which a distribution switch that divides a distribution line into appropriate sections is centrally controlled via a remote control device, the power distribution switch or the remote control device is provided with a slave station, and at least an operation switch that has three positions, ``manual on'', ``manual off'', and ``remote control'', and allows manual switching between these positions;
A remote control receiver that receives an "on" or "off" control signal transmitted from the center via a transmission line and outputs this "on" or "off" control signal for a predetermined short time; By inputting the "in" output signal of the remote control receiver or the "manual input" signal of the operating switch to the set terminal, an "in" output is output, and the "off" output signal of the remote control receiver or the "manual input" signal of the operating switch is output. A holding circuit that outputs an "off" output by inputting a "manual off" signal to a reset terminal, and an output contact that controls the power distribution switch to turn on or off depending on the set or reset state of the holding circuit. A control device for a power distribution switch.