JPS61237326A - 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 Industrial Application] The present invention relates to a disconnection device for switching current and voltage.

[Conventional technology]

As a device for switching current and voltage, a disconnector without current interrupting ability is used to switch the voltage, and a load switch or contactor is used to switch the current. Furthermore, when making and breaking short-circuit current, a circuit breaker is used, or a load switch or contactor is combined with a fuse to obtain the same function.

[Problem that the invention seeks to solve]

As explained above, in the conventional devices for switching current and voltage, the type of switchgear that is most suitable in terms of function and economy is used depending on the respective application. Switching devices with multiple functions that can be used for various purposes are not often used because they are expensive, and the various types of switching devices described above having a single function have been combined to provide a predetermined function. In such a case,
For example, to interrupt short circuit current, a load switch or contactor is used in combination with a fuse, but there are problems such as the fuse blows out with each operation, requiring replacement and high maintenance costs. Since the voltage cannot be disconnected, it is necessary to use a separate disconnector in combination, resulting in problems such as being expensive and requiring extra installation space.

Means for Solving Problem C] The circuit breaker according to the present invention connects a vacuum circuit breaker and a disconnector in series, and when closing the circuit breaker, first closes the vacuum circuit breaker, and then closes the circuit breaker. A part of the driving force generated when this is done is stored in the elastic member, and then the disconnector is closed, thereby closing the disconnection device. On the other hand, if you want to
First, the disconnector is opened, and the vacuum circuit breaker is configured to open after a predetermined time in conjunction with the opening of the disconnector, and at this time, the vacuum circuit breaker rapidly opens by releasing the force stored in the elastic member. It was configured to open. In addition, when an abnormal current flows due to a short circuit, the force stored in the elastic member is released by the detection signal of the detector for detecting the abnormal current, and this releasing force causes the vacuum circuit breaker to open rapidly. did.

[Operation] The vacuum circuit breaker is rapidly opened by releasing the stored power when closing the vacuum circuit breaker when opening the circuit breaker. When opening the circuit breaker, first open the circuit breaker, and then open the vacuum circuit breaker after a predetermined time delay using the interlock mechanism.

〔Example〕

FIG. 1 shows an embodiment of the shutoff device of the present invention. In the figure, a vacuum circuit breaker (
1) has terminals (2a) and (8a) for each contact, and a fixed contact (5) of a disconnector (4) is connected to the terminal (8a).

The disconnector (4) further has a movable contact (6) and has a hinge (
6a) is rotatably coupled to the conductor (7). The operating mechanism (to) is the contact point (2) (3) of the vacuum circuit breaker (1).
This is a mechanism for manually closing the door, and it can be closed by moving the lever α→ in the direction of the arrow. At this time, the operating mechanism (
8) is configured to store energy in a built-in spring (not shown). The movable contact (6) of the disconnector (4) is actuated by the operating mechanism (9). The operating mechanism (9) is configured to be driven by, for example, stored spring energy or power from an electromagnet. The output end of the current transformer (b) for detecting the current in the conductor (7) is connected to an overcurrent relay (g), and if an overcurrent flows through the conductor (7), the current transformer (b) is connected to the overcurrent relay (g). ) output causes overcurrent relay (to)
is provided with a trigger mechanism (to) for operating the operating mechanism (8) of the vacuum circuit breaker (1). The interlock mechanism (2) is a mechanism for controlling the operation between the operating mechanism (9) of the disconnector (4) and the operating mechanism (8) of the vacuum circuit breaker (1), and this interrupter is operated to open. When the movable contact (6) opens, the vacuum circuit breaker (1) opens after a predetermined time.
control so that it is open.

Next, the operation of this invention will be explained. Figures 2 and 8
The figure shows a timing chart of the operation of this embodiment. In FIG. 2, the waveforms indicate opening and closing of the vacuum circuit breaker (1). In this waveform, a high level represents a closed state, and a low level represents an open state, which is the same as the waveform shown in FIG. 2 below and the waveform shown in FIG. The second figure (6) shows the opening and closing of the disconnector (4). The operating sequence when this shutoff device is closed is as follows.

First, manually move the lever α◆ of the operating mechanism (8) to close the vacuum circuit breaker (1). At this time, the operating mechanism (
A spring (not shown) built in 8) is charged by the operation of the lever Q4. This state is represented by the waveform (■) in Figure 2.
a) Indicated by points. The disconnector (4) is then closed by an operating mechanism (9) driven by a power operation, such as stored spring energy or an electromagnet. This state is shown in waveform (B) in FIG. In this way, the above two sets of series connected contacts (2), (3) and (6)
, (6) is closed and current flows through the conductor (7).

Next, when opening this disconnector, first
) is opened by operating the above-mentioned manual switch at point (c) in FIG. (Figure 2 CB) via the interlock mechanism (2)
The operating mechanism (8) is triggered at point d), and when the lever (b) is operated to close the vacuum circuit breaker (1), the stored spring (not shown) is released and the vacuum circuit breaker ( 1) Contact (
2) and (3) are separated at the far end of the ear. The time t1 in the waveform of FIG. 2 indicates the delay n time caused by the interlock mechanism (2). On the other hand, overcurrent and short circuit current are
7), the current transformer Ql) detects the abnormal current and activates the overcurrent relay α0. When the overcurrent relay αQ is activated, the vacuum circuit breaker (1) is activated via the trigger mechanism (2).
) is triggered, and the vacuum circuit breaker (1) is activated by the released force of the spring stored by operating the lever Q4.
Contacts (2) and (3) are rapidly opened. This state is shown at point (e) in Figure 8^. In this case, a disconnector (
4) remains closed without performing any operation linked to the operation of the vacuum circuit breaker (1), and the operation mechanism (9) of the disconnector (4) remains closed.
) can be opened by operating the manual switch. This state is shown at point (f) in the eighth drawing.

In the above embodiment, the operating mechanism (8) of the vacuum circuit breaker (1) is configured to be manually operated, but in the case of a large-sized device, it may be configured to be driven by an electric motor, hydraulic mechanism, etc. Alternatively, the disconnector (4) may be driven manually. Also, the delay time (1
) may be 2 cycles or less.

〔Effect of the invention〕

By combining an inexpensive manually operated vacuum circuit breaker and a disconnector, the circuit breaker of the present invention can cut off voltage and cut off abnormal currents such as those caused by short circuits using the same circuit breaker. Since no consumables such as fuses are used, maintenance costs are low. Furthermore, surges caused by interruption of small currents are also suppressed by the series interruption of the vacuum circuit breaker and the disconnector.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the disconnection device of the present invention, FIG. 2 is a timing chart showing the operation of the disconnection device of the present invention, and FIG. 8 is a timing chart showing the operation of the disconnection device of the present invention in the event of a short circuit. (1)...Vacuum circuit breaker, stop)...Disconnector, (b)
・・Pore detector, (2)・・Interlock mechanism, (to)・
...Trigger mechanism representative patent attorney Masuo Oiwa No. 151 1: Vacuum shutoff IT device 4: Disconnection 5! ! I-device 7: Special salary 11: Current transformer 12: Ink 7 Ne surprise 4 shit 14: Lever 15: Tori swordsman Shiro Ne calculation 2nd figure 3! i

Claims (1)

[Claims] 1. A vacuum circuit breaker and a disconnector connected in series, a means for accumulating driving force when closing the vacuum circuit breaker, and a device that opens the vacuum circuit breaker after a predetermined time delay in conjunction with the opening of the disconnector. a detection means for detecting abnormal current in the conductor; a trigger means that operates when the detection means detects the abnormal current; and an interlock means or trigger means for transmitting the stored driving force. A circuit breaker comprising means for opening a vacuum circuit breaker by discharging the circuit breaker.