JPS60107224A - Locking device of breaker - 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 Application of the Invention] The present invention relates to a locking device for a drawer-type circuit breaker, and particularly to a structure for preventing forgetting to insert a plug for connecting a control circuit.

[Background of the invention]

Generally, there are two types of power circuit breakers: a stationary type and a drawer type that is removably inserted into a switchboard. In the draw-out type, the main circuit of the switchboard and circuit breaker is generally automatically connected or disconnected by inserting or removing the circuit breaker, but the control circuit is automatically connected or disconnected with one hand. There is also a manual type.

The automatic type does not cause erroneous operations such as forgetting to connect or disconnect the circuit breaker, but it requires accurate positional relationship between the switchboard and the circuit breaker, and it also requires a shock absorber during insertion, which is expensive, so the IM unit is not recommended. A manual type is often used. However, with the manual type, I forgot to connect the control plug. When the main circuit is connected and the circuit breaker is turned on manually, no electrical commands are issued, so
Even if a short-circuit accident occurs in the main circuit, the circuit breaker will not operate, making it impossible to protect the main circuit and potentially leading to a major accident.

[Purpose of the invention]

The object of the present invention is to provide a circuit breaker that employs a manual control plug, in which the circuit breaker cannot be moved to the operating position of a switchboard unless the control plug is inserted, and if the control plug is pulled out when the circuit breaker is in the operating position. To provide a locking device that prevents the circuit breaker from being closed.

[Summary of the invention]

The gist of the present invention is to provide a device that interlocks with the attachment and detachment of the control plug and engages or disengages the seat provided on the switchboard and the manual closing button of the circuit breaker.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 shows a state in which the control plug is not connected at the main circuit disconnection position. In the figure, ■ is a control plug on the switchboard side, and a push plate 2 for unlocking is attached to one end.

3 is a control plug on the circuit breaker side, and an operating rod 5 is disposed on the side surface of the control plug 3, which is fixed to the frame 4 of the circuit breaker, facing the push plate 2, and one end of the operating rod 5 is connected to the push plate. 2, and the other end is guided by a guide 6.

One end of a pin 7 is inserted into the middle of the operating rod 5, and the other end of the pin 7 is connected to one end of a lever 8.

The lever 8 is rotatably held by a fulcrum pin 9, and one end of a locking iron lO is connected to the other end by a pin 11. The vicinity of the other end of the locking rod 10 is guided by a frame 12, and the end faces a locking seat 13 on the switchboard side. The locking seat 13 does not engage with the locking rod 10 at the main circuit disconnection position (1 arrangement), and engages at the main circuit connection position.On the other hand, near the middle of the locking rod 10 A closing prevention plate 14 is attached and faces a lever 16 attached to the manual closing button 15.The relationship between the closing prevention plate 14 and the lever 16 is such that the locking rod 10 is connected to the locking seat 13.
It engages only when the person is riding on the top of the machine, so that the manual input button 15 cannot be pulled. The manual closing button 15 is connected to a circuit breaker closing mechanism 17 whose details are omitted, and the circuit breaker is closed when closing energy is stored and the closing button 15 is pulled.

In such a configuration, when the control plugs 1 and 3 are not connected at the main circuit disconnection position shown in FIG.
4 hangs below the lever 16, and pulls the 1 manual input button 15, that is, manual input is possible. If you try to move the circuit breaker to the main circuit connection position in this state,
The locking rod 10 hits the end surface 13a of the locking seat 13,
I can't move. When the control plugs 1 and 3 are connected in this state, the push plate 2 pushes the operating rod 5, and the lever 8 rotates via the pin 7, so the locking iron lo rises.
The state shown in Fig. 2 is reached, and it can be moved to the main circuit connection position. If the closing prevention plate 14 is raised above the lever 16 in state 2, manual closing can be performed at the main circuit connection position.

Generally, the control plug 1.3 is connected in the main circuit disconnection position, or if the control plug is pulled out, the locking rod 1o goes down, but there is a locking seat 13 on the bottom surface. Therefore, the user rides on it and stops, and as shown in FIG. 3, the input prevention plate 14 becomes at the same height as the lever 16, and the 1 manual input button 15 cannot be pulled.

In this way, the main circuit disconnection position allows manual input regardless of the connection of the control plug, but if the control plug is pulled out, the main circuit disconnection position cannot be moved. Also, after connecting the control plug and moving it to the main circuit disconnection position,
The control plug can be pulled out, but once the control plug is pulled out, manual input is also blocked. Of course, the electrical circuit is also cut by the control plug, so the circuit breaker cannot be turned on at all.

〔Effect of the invention〕

According to the present invention, it is possible to safely operate the circuit breaker, and in an emergency, the automatically connecting plug can be pulled out manually, and unless the control plug is inserted again, the next circuit breaker is prevented from closing, so it is safe. .

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a disconnection state diagram of the main circuit and control circuit of the locking device of the present invention, and Fig. 2 is a main circuit disconnection state and control circuit connection state diagram of the locking device of the present invention. FIG. 3 is a diagram showing the main circuit connection and control circuit disconnection state of the locking device of the present invention. 1... Switchboard side control plug, 3... Circuit breaker side control plug, 10... Locking rod, 13... Locking seat,
14... Loading prevention plate, 15... Manual loading button, 1
6...shi/3α

Claims (1)

[Claims] 1. In a drawer-type circuit breaker having a manual attachment/detachment control plug and a manual closing device. A locking rod having a manual closing prevention plate that moves in conjunction with the attachment and detachment of the control plug is provided on the circuit breaker, while on the switchboard side, when the forearm control plug is pulled out at the main circuit disconnection position,
When the circuit breaker is moved to the main circuit connection side, the locking rod hits it and forces it to move, and when the control plug is pulled out at the main circuit connection position, the locking rod rests on it. A locking device for a circuit breaker, characterized in that a locking seat is provided such that the manual closing prevention plate prevents manual closing.