JPH0442741A - Control circuit for switching equipment - 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 Industrial Application] The present invention relates to a control circuit for switching equipment such as a power circuit breaker.

[Conventional technology]

Figures 9 and 10 show the control circuits of conventional switching equipment installed in substations.
Figure 0 is a diagram of the operation panel. In these figures, (
1) is an operation panel installed in the control room (not shown), 00
Reference numeral 1 denotes an operation display section provided on the operation panel (1) to display the operation and opening/closing state of a circuit breaker (20), which will be described later, and is configured as follows.

The operation display section αO) is composed of a push button switch (11), a push button switch (12), a red lamp (13), a resistor (14), a green lamp (15), and a resistor (16). , push button switch (12), red lamp (1
3), the green lamp (15) is connected to the operation panel (1) as shown in Figure 10.
) is placed on the board.

(2) is a switch box installed approximately 1 [b] away from the operation panel (1), and houses one circuit breaker (20) and four disconnectors (50), which are switching devices described later. are doing. (21)
is the closing coil (23) which is the closing circuit of the circuit breaker (20);
) is the tripping coil which is the open circuit of the circuit breaker (20);
(22) and (24) are a normally closed auxiliary contact, which is a first switching circuit that mechanically interlocks with the circuit breaker (20) and is closed when the circuit breaker (20) is open; 2
0) is a normally open auxiliary contact that is a second switching circuit that is closed when it is closed.

The push button switch (11), the closing coil (21), and the normally closed auxiliary contact (22) are connected in series via a connecting wire (31) to the positive connecting line BP and negative connecting line BN of the DC power supply. . Similarly, the pushbutton switch (12), tripping coil (23) and normally open auxiliary contact (24) are connected to the connection wire (3).
2) through the resistor (14), the red lamp (13) and the normally open auxiliary contact (25) through the connecting wire (33), the resistor (16), the green lamp (15) and the normally closed auxiliary contact. contact(
26) are connected in series via a connecting line (34) to a positive connecting line BP and a negative connecting line BN.

(40) is provided on the operation panel (1) and is described later as a disconnector (50).
) is an operation display section that displays the operation and open/close status of the push button switch (41), push button switch (42), red lamp (43), resistor (44), green lamp (45), and resistor (46). It is made up of.

(50) is a disconnector that is a switching device, and four disconnectors (50) are housed in a switch box (2). (51) is a closing coil that is a closing circuit of the disconnector (50); (53)
is an open coil which is an open circuit of a disconnector (50), (52
), (54) are normally closed auxiliary contacts and disconnectors (50) which are first switching circuits that are mechanically interlocked with the disconnector (50) and are closed when the disconnector (50) is open. This is a normally open auxiliary contact that is a second switching circuit that is closed when the switch is turned on, and the push button switch (41) and the closing coil (51) are connected to the normally closed auxiliary contact (52) via the connection wire (61). , push button switch (42) and open coil (53)
and the normally open auxiliary contact (54) via the connecting wire (62),
The resistor (44), the red lamp (43), and the normally closed auxiliary contact (55) are connected via the connecting wire (63), and the resistor (46), the green lamp (45), and the normally open auxiliary contact (56) are connected. They are connected in series via a line (64) to a positive electrode connection line BP and a negative electrode connection line BN.

Next, the operation will be explained. A circuit breaker (2) installed approximately 1 [i] away from the operation panel (1) installed in the control room.
0), the disconnector (50) is remotely controlled. Operation panel (1)
When the push-button switch (11) provided at , is energized and the circuit breaker (20) is closed. The voltage of the DC power supply is 110 [V], the resistance value of the closing coil (21) is 22 [Ω], and when the circuit breaker (20) is closed, a current of 5 [A] flows through the closing coil (21). , when the circuit breaker (20) is closed, its normally closed auxiliary contacts (22) and (26) are opened, and the normally open auxiliary contact (2) is opened.
4) and (25) are closed, so voltage is no longer applied to the closing coil (21), and at the same time, voltage is applied to the red lamp (13) and lights up, and the green lamp (15) is turned off and shut off. It is displayed that the device (20) is in the on state.

When opening the circuit breaker (20), press the push button switch (12).
) to close the contact, the normally open auxiliary contact (24) is closed, so the tripping coil (23) is energized and the circuit breaker (20) is opened. Tripping coil (23)
The resistance value is 110 [Ω], and a trip current of 1 [A] flows, but when the circuit breaker (2o) is opened, the normally open auxiliary contact (24) is opened and the trip current no longer flows. . At the same time, the normally open auxiliary contact (25) is opened, the normally closed auxiliary contact (26) is closed, the red lamp (13) is turned off, and the green lamp (15) is turned on and the circuit breaker (20) is in the open state. Show that.

The resistance values of the series circuit of the red lamp (13) and the resistor (14) and the series circuit of the green lamp (15) and the resistor (16) are 1 [kΩ] each. A current of 0.11 [A:] flows through the lamp (15).

The same applies to the operation display section (40), and the closing coil (51) or opening coil (53) is energized by operating the push button switch (41) or push button switch (42), and the disconnecting switch (50) is closed or opened. and red lamp (43)
The open/closed state is indicated by a green lamp (45).

[Problem to be solved by the invention]

Since the control circuit of the conventional switchgear is configured as described above, each circuit is connected between the operation panel (1) and the switch box (2) to operate the circuit breaker (20) and the disconnector (50). Four connecting wires (31) to (34) and connecting wires (61) to (64) are required, and as shown in Figure 9, one circuit breaker (20) and four disconnectors (50) are required. In the case of
[11 and the switch box (a) are far apart, so there was a problem that construction costs such as connection line material costs and installation costs were high.

Also, the closing coil (21) and tripping coil (23) of the circuit breaker (20) or the closing coil (23) of the disconnector (50)
51) or the open coil (53) is disconnected, there is no display, etc., so you cannot know this, and for example, if you try to open the circuit breaker (20) and the push button switch (12
), the circuit breaker (20) is not opened even if the switch is pressed, and the user notices the abnormality only when the green lamp (15) turns off.

This invention was made to solve the above-mentioned problems, and aims to provide a control circuit for switching equipment that can simplify the control circuit and reduce construction costs.

It is another object of the present invention to provide a control circuit for switching equipment that simplifies the control circuit and allows immediate notification when an abnormality occurs in the closing circuit or open circuit of the switching equipment.

[Means and effects for solving the problems] A control circuit for a switching device according to the present invention connects a closing circuit for closing the switching device and an open circuit for opening the switching device in series to a DC power source. The first switching means and the second switching means are connected in series to a DC power supply, and the open circuit side of the closing circuit and the second switching means side of the first switching means are connected.
The opening/closing device is turned on by operating the opening/closing means, and the opening/closing device is opened by operating the second opening/closing means. The opening/closing means and the open circuit do not need to be connected individually, but can be connected in common, which simplifies the control circuit, reduces the number of connecting wires, and reduces installation costs.

In addition, a closing circuit for closing the switching device and a first switching circuit that is closed when the switching device is opened are connected in series to form a closing series circuit, and an open circuit for opening the switching device and a first switching circuit that is closed when the switching device is opened are configured. The second switching circuit, which is closed when
The opening/closing means and the second opening/closing means are connected in series to a DC power source, the open series circuit side of the closing series circuit and the second opening/closing means side of the first opening/closing means are connected, and the first opening/closing means is connected to the DC power source. A voltage detection device configured to turn on or open the switching device by operating the switching device or the second switching device, and operated by the voltage between the DC power supply and the second switching device side of the first switching device. By providing a means, it is not necessary to separately connect between the first switching means and the closing circuit and between the second switching means and the open circuit, and the operation of the voltage detection means makes it possible to connect the closing circuit or the open circuit. This makes it possible to detect abnormalities in the circuit.

〔Example〕

FIGS. 1 and 2 show an embodiment of the present invention, with FIG. 1 being a sequence diagram and FIG. 2 being a panel diagram of an operation panel. In these figures, (70) is an operation switch for operating the circuit breaker (20), and the operation handle (70a>
(Fig. 2) clockwise to close the normally open contact (71), counterclockwise to close the normally open contact (72), and when you release the operating handle (70a), the operating handle will release the spring. It is configured such that the force returns it to the central position and the normally closed contact (73) closes.

Note that the normally closed contact (73) is a contact that is opened when the operating handle is turned clockwise or counterclockwise, and is closed when the operating handle is in the center position.

(80) is an operation switch that operates the disconnector (50), and is configured in the same way as the operation switch (70), and by turning the operation handle (80a) clockwise or counterclockwise, the normally open contact (
81) and (82) are closed, and the normally closed contact (83) is closed when the operating handle is in the central position.

Operation switches (70), (80) configured as above
are connected as shown in FIG. That is, the operation display section α0) has a normally open contact (71) and a normally open contact (7
2) are connected in series through point a, and both ends of this series circuit are connected to a positive connection line BP and a negative connection line BN, respectively. One end of the red lamp (13) is connected to the negative electrode connection line BN via a resistor (14), and the other end is connected to point a via a normally closed contact (73). The green lamp (15) has one end connected to the positive connection line BP via the resistor (16), and the other end commonly connected to the other end of the red lamp (13) and connected to point a via the normally closed contact (73). It is connected.

In addition, in the switch box (2), the closing coil (21)
is connected in series with the normally closed auxiliary contact (22), the tripping coil (23) is connected in series with the normally open auxiliary contact (24), and both circuits connected in series are further connected in series through point b. Negative terminal connection 1iBN with both ends drawn into the switch box ■,
It is connected to the positive electrode connection line BP.

The same applies to the connection of the operation switch (80) and the disconnector (50), and the normally open contacts (81) and (82) are connected in series through the 0 point to connect the positive connection line BP and the negative connection line BN. One end of the red lamp (43) and green lamp (45) are connected to the negative electrode connection line BN and the positive electrode connection line BP through the resistor (44) and resistor (46), respectively, and the other ends are connected in common. and is connected to point 0 via a normally closed contact (83).

Series circuit of closing coil (51) and normally closed auxiliary contact (52) and open coil (53) and normally open auxiliary contact (54)
The series circuits are connected in series through point d, and both ends are connected to the negative connection line BN and the positive connection line BP.

The operation display unit (101 and circuit breaker) connected as above
20), the operation display section (40) and the disconnector (5o) are respectively a
One connecting line (31) connects the point and point b, and one connecting line between point 0 and point d, (
61).

The normally open contacts (71) and (81) are the first switching means in this invention, and the normally open contacts (72) and (82) are the closing coil (21) of the second switching means in this invention.
) and the normally closed auxiliary contact (22), and the series circuit between the closing coil (51) and the normally closed auxiliary contact (52) are the closing circuit in this invention in which the closing circuit and the first switching circuit are connected in series. Series circuit of tripping coil (23) and normally open auxiliary contact (24) and open coil (53)
The series circuit of the normally open auxiliary contact (54) is the red lamp (13), (43), green lamp (1) of the open series circuit in which the open circuit and the second switching circuit are connected in series.
5) and (45) are examples of the voltage detection means in this invention.

Next, the operation will be explained. When the operating handle of the operating switch (70) is turned to the right, the normally open contact (71) closes and the closing coil (21) is energized to close the circuit breaker (20), and when the operating handle is released, the operating handle is closed. returns to the center position, the normally closed contact (73) closes and the resistor (14
), a red lamp (13), a normally closed contact (73), a tripping coil (23), and a normally open auxiliary contact (24). 23) is 110 [Ω] as mentioned above, and the series resistance between the red lamp (I3) and resistor (14) is 1 [k].
[Ω], so 110 [V] is divided into the series circuit of the red lamp (13) and the resistor (14), and a voltage of about 100 (V) is applied, and the red lamp (13) is turned on. Although the red lamp (13) becomes slightly darker, if the series resistance between the red lamp (13) and the resistor (14) is reduced to 900 CΩ, it will turn on with the same brightness as the conventional example.

The series circuit of the green lamp (15) and the resistor (16) is connected in parallel with the tripping coil (23) when viewed from the connection wire (31), so the green lamp (15) and the resistor (
Approximately 10['~l] of the voltage across the tripping coil (23) is applied to the series circuit with the tripping coil (23), but since this value is small, the green lamp (15) does not light up.

In addition, a current of approximately 0.1 (A) flows through the tripping coil (23), but since the current value is small, the tripping coil (23)
23) does not work. The red lamp (13) is lit via the tripping coil (23), so if the tripping coil (23) is disconnected in this state, the lighting current will no longer flow through the red lamp (13) and the resistor ( 14), when 11'0[:V] is applied to the series circuit of red lamp (13), green lamp (15), and resistor (16), red lamp (13), green lamp (15) Since only half of the rated voltage is applied to both, the red lamp (13) and green lamp (15) do not turn on and remain off, so it is important to know that the tripping coil (23) has broken. I can do it.

When opening the circuit breaker (20), use the operation switch (70)
When the operating handle is turned to the left to close the normally open contact (72), the tripping coil (23) is energized and the circuit breaker (20
) is opened, and the resistor (16) and green lamp (
15), closing coil (21), normally closed auxiliary contact (22)
110 CV) is applied to the series circuit of the closing coil (
Since the resistance value of 21) is as low as 22 [Ω], the green lamp (15) is lit in the same way as the red lamp (13) in the above-mentioned case of turning on. Of course, the current flowing through the closing coil (21) at this time is as low as approximately 0.1 (A), so
) does not work. If the closing coil (21) is disconnected in this state, the red lamp (13) and green lamp (15) will turn on in the same way.
Both lights go out, so you can tell if there is an abnormality.

The same applies to the case where the disconnector (50) is operated by the operation switch (80), and the red lamp (43) and green lamp (45) indicate the open/close state of the disconnector (50) and the closing coil (51). , it is possible to know the occurrence of disconnection of the open coil (53).

FIG. 3 is a sequence diagram showing another embodiment of the present invention. When the excitation current of the closing coil (21) is large (some switching devices have an excitation current exceeding 100 (l)), the connecting wire (31) Connecting wire (31) to reduce the voltage drop of
To avoid this, an auxiliary relay (21X) that operates with a small current (21X), (2
3X) is provided, and the opening/closing contact (21a) of this auxiliary relay is
, (23a) are used to excite the closing coil (21) and the tripping coil (23), and the auxiliary relay (2]X), the switching contact (21a), and the closing coil (2)
1) constitutes a closing circuit, and an auxiliary relay (23X), a switching contact (23a), and a tripping coil (23) constitute an open circuit. In this embodiment, disconnections in the closing coil (2I) and tripping coil (23) cannot be detected, but disconnections in the auxiliary relays <21X) and (23χ) can be detected in the same manner as in the embodiment shown in FIG. I can do it.

4 to 7 further show other embodiments of the present invention, in which FIG. 4 is a sequence diagram, FIGS. 5 and 6 are front and side views of the selection operation switch, and FIG. Figure 7 is a diagram of the operation panel. In these figures, reference numeral 90 indicates a selection operation switch, which allows any circuit breaker (20) or disconnector (50) to be selectively operated using one selection operation switch. The selection operation switch (90) has a rotating and push/pull operation function, and has a total of six disconnection switches, including a disconnector, a circuit breaker, a disconnector A, a disconnector B, and a disconnector C1, as shown in FIG. When the operation handle is rotated to the circuit breaker J position, the circuit breaker (2
The selection switches <93) and <94) for selecting 0) are closed, and when the operation handle is pulled, the selection switch (91), which is the first opening/closing means, is closed, and the closing coil (21) is energized, and the circuit breaker ( 20) is turned on and the operating handle is pressed, the selection switch (92), which is the second opening/closing means, is closed and the tripping coil (23) is energized, causing the circuit breaker (2
0) is opened and when the operating handle is released, the normally closed contact (95) closes and the red lamp (13) or green lamp (15) is lit depending on whether the circuit breaker (20) is opened or closed.

The same applies when operating a disconnector. For example, turn the operating handle of the selection operation switch (90) to the "disconnector A" position, close the selection switches (96) and (97), and press and pull the operating handle. By closing the selection on/off switch (91) or the selection on/off switch (92), the closing coil (
51) or excite the open coil (53) to disconnect the FI @ device (
50) Also in the embodiment for opening and closing, the closing coil (
21), closing coil (51) and tripping coil (23)
, red lamp (13), green lamp (15), red lamp (43), green lamp (45) indicates disconnection of open coil (53).
You can check the lighting status.

FIG. 8 is a sequence diagram showing still another embodiment of the present invention, in which a red lamp is also illuminated in the switch box (2) in order to know the opening/closing status and abnormality of the circuit breaker (2o) and the disconnector (50). (
13), a resistor (14), etc., and a red lamp (13) and a resistor (14) installed on the operation panel (1).
etc. are lit in parallel.

In each of the above embodiments, if a disconnection occurs in the closing coil (21), the tripping coil (23), the closing coil (51), or the opening coil (53), the positive connection line BP of the DC power source connects to point a and point C. , and the negative electrode connection line BN changes, so the red lamp (13) is used as a voltage detection means.
, green lamp (15) and red lamp (43), green lamp (
45)), but for example, a
You can also connect one voltmeter between the point and the positive connection line BP, and between the point a and the negative connection line BN, and check the indications (a scale that has been converted into a resistance value in advance may be attached) to know if an abnormality has occurred. In this case, it is possible to detect not only a disconnection but also a short circuit between the eyebrows of the coil, etc., based on the magnitude of the indicated value. It is also possible to issue a warning by sounding a buzzer or the like using a voltage relay.

Furthermore, in each of the above embodiments, the closing coil (21), the tripping coil (23), the closing coil (51), the opening coil (53), or the auxiliary coil l/-(21X), (23
Normally closed auxiliary contact (22), normally open auxiliary contact (24), normally closed auxiliary contact (52), normally open auxiliary contact (
54), but these are not essential; for example, the closing coil (21) and the tripping coil (23) are inserted.
) are close to each other, a voltage half the rated voltage is always applied to each of them, but at this voltage, the closing coil (21),
It is also possible to disable the tripping coil (23) and omit the normally closed auxiliary contact (22) and the normally open auxiliary contact (24). In this case, red lamp (13), green lamp (1
Since 5) only functions as a voltage detection means, an indicator light is separately provided to indicate the open/closed state of the circuit breaker (20).

Note that the opening/closing device may be operated using a hydraulic or pneumatic solenoid valve, an electric motor, or the like.

〔Effect of the invention〕

As described above, according to the present invention, since the connection between the first switching means and the closing circuit and the connection between the second switching means and the open circuit are not made individually but can be performed in common, the control Circuit connections are simplified, and construction costs such as wiring material costs and installation costs can be reduced.

Furthermore, since a voltage detection means is provided, it is possible to immediately know if an abnormality occurs in the closed circuit or open circuit.

[Brief explanation of the drawing]

Figures 1 and 2 show one embodiment of the present invention; Figure 1 is a sequence diagram, Figure 2 is a panel diagram of the operation panel, and Figure 3 is a sequence diagram showing another embodiment of the invention. Figure, Figure 4~
FIG. 7 shows another embodiment of the present invention, in which FIG. 4 is a sequence diagram, FIGS. 5 and 6 are front and side views of the selection operation switch, and FIG. 7 is a panel view. , FIG. 8 is a sequence diagram showing another embodiment of the present invention, and FIGS. 9 and 10 show control circuits of conventional switching equipment.
FIG. 9 is a sequence diagram, and FIG. 10 is a board diagram. In the figure, (13) and (43) are red lamps, (15)
, (45) is a green lamp, (20) is a circuit breaker, (21),
(51) is a closing coil, (22), (52) are normally closed auxiliary contacts, (23) is a tripping coil, (24), (54)
) is a normally open auxiliary contact, (31), (61) are connection wires, (
50) is a disconnector, (53) is an open coil, (70), (
80) is an operation switch, (71), (72), (81),
(82) is a normally open contact of the operation switch, and (90) is a selection operation switch. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Patent Attorney Masuo Oiwa Figure 2 Figure 3, j 21X, 23X 4'II Mekuri-shi- 21a, 23a Kusunoki Kusuke's Lou's Boy- (- (rAJ-kai, I ¥) → (Opening operation ) Figure 5 Figure 6 Figure 10 Figure 7 Figure 8!

Claims (2)

[Claims] (1) A first switching means that connects a DC power source in series with a closing circuit for closing a switching device and an open circuit for opening the switching device, and is provided at a distance from the closing circuit and the opening circuit; and a second switching means are connected in series to the DC power supply, and the open circuit side of the closing circuit and the second switching means side of the first switching means are connected to each other, and the first switching means is connected in series to the DC power supply. 1. A control circuit for a switching device, characterized in that the switching device is configured to be turned on or opened by operating the switching device or the second switching device. (2) A closing series circuit in which a closing circuit that closes the switching device and a first switching circuit that is closed when the switching device is open are connected in series, an open circuit that opens the switching device, and the switching device The second one is closed when the
A first switching means and a second switching means are connected to a DC power supply by further connecting the open series circuit in series with the switching circuit and the opening/closing circuit. are connected in series to the DC power supply, and the open series circuit side of the closing series circuit and the second switching means side of the first switching means are connected to the first switching means or the above. The switching device is configured to be turned on or opened by operating the second switching means, and the voltage is operated by the voltage between the DC power supply and the second switching means side of the first switching means. A control circuit for a switching device, characterized in that it is provided with a detection means.