JPH0955148A - Control circuit for disconnector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate position adjustment of limit switches for recognizing operation completion positions and reduce the number of them. SOLUTION: A position detection electromagnetic relay 89X which has a series circuit of a limit switch LS2 for open circuit completion and a limit switch LS1 for closed circuit completion in an excitating circuit is provided and the contact is assembled in respective excitating circuits of opening/closing electromagnetic relays 89DC, 89DD and a manual handle interlock circuit. This constitution provides one each limit switch for an open circuit and a closed circuit and facilitates position adjustment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit capable of confirming an open circuit completion state and a circuit disconnection completion state during opening / closing operation of a disconnector.

[0002]

2. Description of the Related Art FIG. 3 shows an example of the configuration of a control circuit for an electrically operated disconnector which does not have load current switching capability. 89D in the figure
C is the electromagnetic relay for closing, 89DD is the electromagnetic relay for opening,
LS11 and LS12 are limit switches for closing the circuit,
LS21 and LS22 are limit switches for opening circuit,
89LK is a manual handle locking electromagnet, DR is a door switch, P is a positive control power supply line, and N is a negative control power supply line.
Each of the electromagnetic relays 89DC and 89DD has an a-contact and a b-contact, which are indicated by suffixes a and b. Further, reference numerals 89DC and 89DD are attached to coil portions.

In the above circuit configuration, when the "ON" command for the disconnecting switch is issued, the electromagnetic relay 89DC is excited and the closing operation of the disconnecting switch is started. Then, when the circuit is operated up to the circuit closing position, the circuit closing limit switch LS11 becomes O.
It becomes FF and the motor stops.

Similarly, when a "disconnect" command for the disconnecting switch is issued, the electromagnetic relay 89DD is excited and the disconnecting switch opening operation is started. When the open circuit completion position is reached, the open circuit completion limit switch LS21 is turned off and the electric motor is stopped.

Further, in the manual operation, when the door of the operation box is opened, the door switch DR is turned on, and the parallel handle circuit of the limit switches LS12 and LS22 allows the manual handle locking electromagnet 89LK to be closed or opened. Is excited and the handle can be attached and detached.
The handle cannot be attached or removed at other positions. This prevents the disconnector from being stopped and left in the intermediate position.

[0006]

In the control circuit shown in FIG. 3, there are four limit switches (electromagnetic relays 89DC, 8DC).
Limit switches LS11, LS21 for controlling 9DD
And the limit switches LS12, LS22) that control the manual handle locking electromagnet 89LK. Therefore, it is necessary to adjust the operating position of the limit switch for each of the four switches. Moreover, the limit switches LS11, LS21 for stopping the electric motor and the limit switches LS12, LS22 for the manual handle lock operate simultaneously in the operating direction, or the limit switch for the manual handle lock slightly moves first. The position of the limit switch needs to be adjusted to work. The reason is that if the limit switch for stopping the motor operates and the motor stops before the limit switch for the manual handle lock, the manual handle cannot be inserted even if the next manual operation is performed. This is because it ends up.

Therefore, the work of adjusting the limit switch becomes complicated. Further, since the limit switch is attached to the operation mechanism section, there is a space limitation.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above problems and provide a control circuit for a disconnecting switch, in which limit switches can be easily adjusted and the number of switches can be reduced.

[0009]

According to the present invention, in a control circuit for an electrically operated disconnector, an electromagnetic relay for position detection having a series circuit of a limit switch for opening completion and a limit switch for closing completion in an exciting circuit is provided. , The contact is incorporated in the excitation circuit of the electromagnetic relay for opening and closing and the manual handle interlock circuit. One limit switch is provided for opening and one for closing, which facilitates position adjustment. Become.

[0010]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a time chart thereof. In FIG. 1, 89DC is a closing electromagnetic relay, 89DD is an opening electromagnetic relay, LS1 is a closing completion limit switch, and LS.
2 is a limit switch for closing the circuit, 89LK is a manual handle locking electromagnet, DR is a door switch, 89X is an electromagnetic relay for position detection, 89 is an auxiliary switch, P is a positive control power supply line, and N is a negative control power supply line. Is. Each electromagnetic relay 89
DC, 89DD, and 89X each have an a contact and a b contact, and are indicated with subscripts a and b. When the number of contacts is plural, it is displayed as 1a, 2a (1b, 2b). Further, reference numerals 89DC, 89DD and 89X
Is attached to the coil portion.

The position detecting electromagnetic relay 89X has its coil connected between the positive and negative control power source lines P and N through a series circuit of a closing completion limit switch LS1 and an opening completion limit switch LS2, and has an a contact. 89X1a is connected in parallel with the b contact of the auxiliary switch 89 to close the electromagnetic relay 8
A switch 89X2a is connected to the 9DC excitation circuit and the auxiliary switch 8
9 are connected in parallel with the a-contact and incorporated into the exciting circuit of the electromagnetic relay 89DD for opening.

Next, the operation will be described. When the closing command (change switch CS “ON” ON) is issued in the disconnecting switch open state, the b contact of the auxiliary switch 89 is closed and the a contact is in the open state, so the electromagnetic relay 89DC for closing is excited, The disconnector starts the closing operation. However, at this time, when the disconnector is in the closed state, the b contact of the auxiliary switch 89 and the a contact 89X1a of the position detecting electromagnetic relay 89X are provided.
Is in the open state and the closing operation is prevented. After that, the b contact of the auxiliary switch 89 is turned off, but the a contact 89X1a of the position detecting electromagnetic relay 89X is turned on before that, so that the closing operation is continued. Then, at the circuit closing position, the a contact 89X1a of the position detection switch 89X is OF.
F, that is, the circuit closing limit switch LS1 is OFF
Then, the closing operation is stopped.

Although the above-mentioned operation is the circuit closing operation, the same applies to the circuit opening operation. That is, the contact of the auxiliary switch 89 becomes the contact a, and the circuit opening operation is stopped by turning off the circuit opening completion limit switch LS2.

Further, in the manual operation, the b contact 89Xb of the position detecting electromagnetic relay 89X is turned OFF at the intermediate position (between the closing completion position and the closing completion position), and the manual handle locking electromagnet 89LK is not excited. , The handle cannot be attached or removed. At this time, the door switch DR is involved. That is, when the door is closed, the manual handle locking electromagnet 89LK is not excited and is prevented from being constantly excited.

The coil of the auxiliary relay 89X controls its excitation by the limit switches LS1 and LS2, but since either of them is turned off at the operation completion position, no current always flows through the coil of the electromagnetic relay 89X. It is like this.

[0016]

As described above, according to the present invention, one opening and closing limit switch is used for the exciting circuit of the position detecting electromagnetic relay, and its contact is used as the exciting circuit of the opening and closing electromagnetic relay. Since it is incorporated in the manual handle interlock circuit, only one limit switch is required for opening and one closing switch, and position adjustment is facilitated. Further, when the operation completion signal is used for other purposes, it is only necessary to change the number of contacts of the position detecting electromagnetic relay. Further, since the circuit configuration does not require a constant current to flow through each electromagnetic relay or coil of the electromagnet, there is an advantage of safety.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the present invention.

FIG. 2 is a time chart for explaining the operation of the embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional example.

[Explanation of symbols]

 89DC ... Closing completion limit switch 89DD ... Closing completion limit switch 89LK ... Manual handle locking electromagnet 89X ... Position detecting electromagnetic relay 89 ... Auxiliary switch LS1 ... Closing completion limit switch LS2 ... Opening completion limit switch DR ... Door switch

Claims (1)

[Claims] 1. A control circuit for an electrically operated disconnector, wherein a position detecting electromagnetic relay having a series circuit of an opening completion limit switch and a closing completion limit switch in an excitation circuit is provided, and its contact is an opening / closing electromagnetic relay. A control circuit for a disconnecting switch, characterized by being incorporated in an exciting circuit and a manual steering wheel interlock circuit.