JPS5910914Y2 - Electrical equipment status display circuit - Google Patents

Description

[Detailed description of the invention] The present invention relates to a status display circuit, and particularly to a monitoring panel for electrical equipment,
The present invention relates to an electrical equipment status display circuit that is installed on an operation panel or the like and is configured with a relay circuit to display the status of the electrical equipment.

Conventional electrical equipment status display circuit (hereinafter referred to as display circuit).

) is installed on a monitoring panel, etc., and has the structure described below to continuously indicate the status of electrical equipment, such as a breaker, or to flash the light when an abnormality occurs. .

FIG. 1 shows a conventional display circuit, which is equipped with relays 1, 2, and 3, and lamps 6 and 7, and is designed to display its status via a B contact 5 that is linked to a breaker (not shown). , the lamp 6 or 7 was turned on continuously or blinking.

And when blinking of lamp 6 or 7 is not required,
This was done by externally activating the b contact 8 to open the circuit.

That is, the relay 1 is a flicker-operated relay that is connected between a line A, which is a control bus, and a line N, which is its return line, and has an a contact 1a, which is connected between a line P, which is a control bus, and a line B. It is.

The nolay 2 is connected to the line P at one end and the line N at the other end via the a contact 5, and is a composite contact that temporarily makes or wraps when transitioning from de-energized to energized or vice versa. It has a certain contact 2a, a b contact 2b, and an a contact 2C.

One end of the relay 3 is connected to the line P via the contact 2a and the B contact 8, and to the line C via the A contact 3a, and the other end is connected to the line N. , a B contact 3b, and a C contact 3C.

The lamp 6 lights up in red and indicates the closed circuit state of the breaker.
One end is connected to the line P via the B contacts 2b and 3b, and is also connected to the line B via the B contacts 2b and the A contact 3C,
The other end is connected to the N line.

The lamp 7 lights up in green and indicates the open circuit state of the breaker.
One end is connected to the connection point of the b contacts 2b and 3b via the a contact 2C, and the other end is connected to the line N.

The line P is connected to the line B via the a contact 1a, and is also connected to the C line via a switch 7 from the b contact for releasing the self-holding of the relay 3 in a push-button manner.

The line P is connected to a power source (not shown) as a bus line, and power is supplied thereto.

The line B is a bus bar to which intermittent power is supplied from the line P by the intermittent operation of the a contact 1a.

Line C is a bus line that is opened by pressing switch 7 and releases the self-holding state of relay 3.

Next, the operation will be explained.

First, when the circuit breaker is not activated and is closed,
This display circuit is in the state shown, from the line P to the b contact 3.
Power is supplied to the lamp 6 through the terminals b and 2b, and the lamp 6 is continuously lit.

At this time, when the breaker is closed by the fault signal, b
Contact 5 is closed and relay 2 is activated.

This temporarily closes the contact 2a, energizes the relay 3, and causes the a contact 3a to self-hold.

Further, the a contact 3d is closed, activating the relay 1, and a
Contact 1a is closed to supply intermittent power to line B.

Then, this power is supplied to the lamp 7 from the line B through the a contact 3C and the a contact 2C to cause the lamp to blink, that is, to flicker.

At this time, since the b contact 2b is open, the lamp 6 is not lit.

Next, when switch 7 is pressed, it opens, disconnecting line C from line P and releasing the self-holding of relay 3, so that lamp 7 receives power from line P via contact 3b and contact 2c. The light is supplied and lit continuously, and the relay 1 is also de-energized.

By the way, when the breaker is activated by an automatic control signal or an operation switch (not shown) on the monitoring panel, the b contact 8
The circuit will also be opened.

Therefore, when the circuit breaker is activated without such a fault signal, the relay 3 and therefore the relay 1 are not activated, and the lamps 6 and 7 are not flickered on.

Since the conventional electric equipment status display circuit is constructed as described above, a contact point 8 had to be provided in order to stop the lamp from blinking when there is no longer a need for it.

Although the contact 8 is illustrated as being composed of a single contact, there is a drawback that a complicated relay circuit and wiring (not shown) are required in order to operate the contact 8. It has been desired to automatically stop the blinking of the lamp without using the contacts 8.

The present invention was made in order to eliminate the drawbacks of the conventional circuit as described above, and aims to provide an electrical equipment display circuit that can automatically stop the blinking of a lamp with a simple arrangement. purpose.

For this reason, the present invention is equipped with a time-limited relay so that even if the circuit breaker is activated by an operation signal, the lighting of the lamp is automatically stopped after a certain period of time.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an electrical equipment display circuit according to the present invention.

In the following explanation, explanations of parts that overlap with the explanation of FIG. 1 will be omitted.

In FIG. 2, a time-limited relay 9 is connected in parallel with the relay 1, and its b contact 9a is connected in series with the switch 7.

Thereby, the line P is connected to the D line via the switch 7 and the b contact 9a.

Further, the relay 3 has one end connected to the P line via a contact 2a, and is connected to the D line via a contact 3a.

Other connections are the same as in FIG.

Explain the operation.

First, when the breaker is opened by a fault signal or an open circuit signal, the contact 5 is closed and the relay 2 is energized.

Therefore, contact 2a is activated, activating relay 3, and
It is self-held by the contact 3a, and the a contact 3d is closed to operate the relays 1 and 9.

As a result, the a contact 1a is closed, and the line P is intermittently connected to the line B.

The line B is therefore connected to the lamp 7 via the a-contacts 3C and 2C, supplying intermittent power to it and causing it to blink.

After that, the contact 9a is opened according to the delay operation, so that
Release the self-holding of relay 3.

As a result, relays 1 and 9 are also released, so that the a contact 1a is opened and the line B is cut off from the power supply.

As a result, since only the relay 2 is operating, power is supplied from the line P to the lamp 7 via the b contact 3b and the a contact 2C, and the lamp 7 is lit continuously.

On the other hand, when the breaker is closed by the closing signal and the contact 5 is opened, the relay 2 is demagnetized, so the contact 2a is activated and the same operation as in the case where the above-mentioned opening signal is given is performed.

However, in this case, relay 2 is demagnetized, so
Since the B contact 2b is closed and the A contact 2C is open, the lamp 7
The difference is that the lamp 6 goes from a lit state to an extinguished state, the lamp 6 goes from an unlit state to a blinking state, and continues to be lit after a certain period of time.

In this way, the lamp 6 or 7 is lit in accordance with the state of the circuit breaker, but these blinks are temporary due to the time-limited operation of the relay 9, and are lit continuously in a steady state.

In this case, in the conventional circuit shown in Fig. 1, the lamp 7 flashes only when the circuit breaker is opened by a fault signal, but in the present invention (Fig. 2), the lamp 7 is flashed only when the circuit breaker is opened by a fault signal. Lamps 6 and 7 are temporarily flashed in the same way as before.

It is possible to determine whether the circuit breaker is open based on the fault signal by the supervisor (the lamp turns on when the circuit breaker does not issue the open circuit signal).

In addition, in the above embodiment, the status of one breaker was shown, but in the case of multiple breaker, multiple circuits like this (circuits inside the dotted line shown in Fig. 2) can be displayed. Just be prepared.

Further, it goes without saying that the electrical equipment whose status is to be displayed may be a contact, a switchgear, etc. in addition to a circuit breaker.

As described above, according to the present invention, it is possible to automatically stop the blinking of the lamp with a simple structure, and the circuit as a whole becomes simple and economical.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional electrical equipment status display circuit, and FIG. 2 is a diagram showing an electrical equipment status display circuit according to an embodiment of the present invention. 1, 2, 3.9...Relay, 6,7...
・Lamp, 7...Switch.

Claims (1)

[Scope of utility model registration request] A contact that operates in response to the open/close state of an electrical device, a first relay that is activated by the operation of the contact, a second relay that is self-maintained by the operation of the first relay, and the second relay. a third relay having a contact that is activated by the operation of the relay and performs an intermittent operation;
An electrical equipment status display circuit comprising: a lamp that is turned on when the second relay is activated; and a switch that releases the self-holding of the second relay when manually operated;
The relay is connected in parallel to the third relay and has a time-limited B contact connected in series with the switch, and when the B contact is opened, the self-holding of the second relay is released. Electrical equipment status display circuit.