JPS6342434Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a DC high-speed circuit breaker, which uses a particularly simple link mechanism to prevent overcurrent from flowing in the electrical circuit.
This invention relates to an operating mechanism for a DC high-speed disconnector that can open and release a movable electrode at high speed even during a closing operation and that can withstand frequent use.

Conventionally, the operating mechanism of a commonly used DC high-speed disconnector is that when a fault current exceeding the operating setting value set by a scale spring flows through the conductor, the fixed iron core of the tripping electromagnet resists the scale spring. The movable iron core is attracted to the movable iron core, and the suction of the movable iron core drives a tripping mechanism to separate the movable contact from the fixed contact.

By the way, as long as the attraction force that attracts the movable iron core by the magnetic flux caused by the fault current is activated only after it overcomes the spring force of the scale spring, the time required for the magnetic flux to rise is long, and the time required for the movable contactor to separate from the occurrence of the accident is long. This has the disadvantage that the time required, ie, the tripping time, increases.

Therefore, in order to shorten the trip time and perform high-speed disconnection, when the fault current exceeds the operating setting value, the charge stored in the capacitor is rapidly discharged by conducting the silicon-controlled rectifying element. , this discharge current is passed through the tripping coil, the magnetic flux of the holding coil is canceled by the electromagnetic force, the movable iron core is separated from the fixed iron core by a strong tripping spring, and the mounting arm of the movable contact is shocked. An operating mechanism for a DC high-speed disconnector has been proposed that allows the switch to be moved and tripped.

However, since such a proposal uses a single simple lever, if an overcurrent flows in the electrical circuit, it is impossible to separate the movable contact from the fixed contact during the closing operation. It takes time to complete the closing operation, and the cylinder mechanism is structured so that only the closing operation can be performed, making it unsuitable for frequent use in which a high-speed disconnector and an electro-pneumatic contactor are used together.

The present invention was developed in response to the above-mentioned problems, and its purpose is to be able to quickly open and release the movable contact even during the closing operation while maintaining high-speed shrinkage characteristics. An object of the present invention is to provide an operation mechanism for a DC high-speed shield and disconnector that can withstand frequent use.

The feature of this invention is that it consists of a mounting arm for a movable contact, a tripping arm, a rod, and an L-shaped lever.
The mounting arm is rotatably supported by a book link without a fixed shaft, and a strong tripping spring 1
The point is that all operations are possible only with pairs.

The present invention will be explained below based on the drawings of the embodiments. 1, 2, and 3 are block diagrams of an embodiment of the operating mechanism of the DC high-speed shield breaker according to the present invention, with FIG. 1 showing the closed state and FIG. FIG. 3 shows the open state, and FIG. 3 shows the ready state.

In FIGS. 1, 2, and 3, 1 and 2 are main circuit terminals, 3 is a blowing coil that functions to blow out the arc when the beam is disconnected, 4 is a holding coil that excites the stator core 6, and 5 1 is a tripping coil that is excited by the discharge current of the capacitor when a fault current is detected, 7 is a fixed contact, and 8 is a movable contact. The movable contact 8 is attached to a contact base 9 supported by a mounting arm 10 via a pin 11. The contact base 9 has a movable contact 8 fixed to one end, and a flexible wire (conductor) 1 to the other end.
3 is connected. Further, at the other end of the contact base 9, there is a trip spring 1 that applies appropriate contact pressure between the fixed contact 7 and the movable contact 8 and also applies a trip force.
2 is installed. A movable core 14 is fixed to a tripping arm 15 so as to face the fixed core 6, and the tripping arm 15 rotates around a pin 16. The movable core 14 is fixed to one end of the tripping arm 15, and the other end is rotatably fastened to the mounting arm 10 via a pin 17. 18 is the mounting arm 10 and pin 19
L-shaped lever 2 is a rod rotatably connected with
0 and a power transmission section for opening and closing the fixed contact 7 and the movable contact 8. One end of the L-shaped lever 20 is rotatably fastened to the rod 18 via a pin 21, and the other end is freely fastened to the movable magnetic pole 26 via a pin 27. 23 is a yoke, and 24 is a magnetic pole fixed to the yoke 23. 25 is an excitation coil, 26 is a movable magnetic pole, a yoke 23 and a magnetic pole 24,
The excitation coil 25 constitutes an electromagnetic closing mechanism. 2
Reference numerals 8 and 29 are a fault current detector 28 and a tripping device 29 which have already been proposed, and 30 is a stopper for the mounting arm 10 when the fixed contact 7 and the movable contact 8 are separated.

Its operation will be explained next.

First, to turn on the DC high-speed circuit breaker, the holding coil 4 is energized and the movable core 14 is connected to the stator core 6.
At the same time, the excitation coil 25 is excited to attract the movable magnetic pole 26 to the left. Movable magnetic pole 2
6, the L-shaped lever 20 rotates clockwise about the pin 22 and pushes up the rod 18 which is fastened via the pin 21. The movement of the rod 18 causes the mounting arm 10 and the contact base 9 to be lifted upward against the tripping spring 12 via the pin 19. Thus, the movable contact 8 comes into close contact with the fixed contact 7 to complete the closing operation. This state is the state shown in FIG.

When the fixed contact 7 and the movable contact 8 are closed, the fault current detector 28 - main circuit terminal 1 - blowing coil 3
A current flows through the path of - fixed contact 7 - movable contact 8 - contact stand 9 - main circuit terminal 2, and the reed switch 28a of the fault current detector 28 does not become conductive, so the tripping coil 5 is not excited. Thus, the closed state is maintained by the holding coil 4.

Now, when a current higher than the operating setting value given by the fault current detector 28 flows through the conductor penetrating the fault current detector 28, the reed switch 28a becomes conductive, and the thyristor 2 of the tripping device 29 is turned on.
A gate signal is given to 9a.

Normally, the capacitor 29b of the tripping device 29 is charged, so when the thyristor 29a becomes conductive, the charge in the capacitor 29b is discharged via the tripping coil 5 of the fixed iron core 6. Tripping coil 5
When the movable core 14 is energized, it is set on the fixed core 6 so that the polarity is opposite to that of the holding coil 4, so that the attraction force between the instantaneous fixed core 6 and the movable core 14 becomes null. As a result, the tripping arm 15 rotates counterclockwise around the pin 16 by a component of the return force of the tripping spring 12, and the pin 17, which is one end of the tripping arm 15, moves upward at high speed. Push up. As a result, the mounting arm 10
rotates counterclockwise about the pin 19, and the spring force of the tripping spring 12 opens the movable contact 8 downward, and the mounting arm 10 abuts against the stopper 30, completing the tripping. This state is the state shown in FIG. 2, and the excitation coil 25 for closing maintains the excited state.

FIG. 3 shows a state in preparation for re-input, and when the excitation coil 25 for current injecting is demagnetized, the magnetic pole 24
The adsorption force between the movable magnetic pole 26 and the movable magnetic pole 26 becomes null. Therefore, the spring force of the tripping spring 12 causes the mounting arm 10 to
rotates clockwise around the joint surface with the stopper 30. As a result, rod 18 falls downward,
The L-shaped lever 20 rotates counterclockwise, and the movable magnetic pole 26 moves to the right. At the same time, the mounting arm 10
By rotating clockwise, the tripping arm 15
One end of the pin 17 falls downward. As a result, the tripping arm 15 rotates clockwise around the pin 16, and the movable core 14 automatically moves from the fixed core 6.
and is attracted by the holding coil 4, completing preparations for reinsertion. In the readiness state, the movable core 14
By bringing the fixed iron core 6 into close contact with the fixed iron core 6, it acts as a stopper. This state is the state shown in FIG.

In this way, the four links (removal arm 15, mounting arm 10, rod 18, L-shaped lever 20) are used to load,
The tripping and closing preparations are performed, and the delay time from current detection to the excitation of the tripping coil 5 is extremely small, several hundred μs, and by selecting the leverage of the mounting arm 10, the tripping arm can be made smaller and lighter. High-speed tripping is possible with less than half the spring force of the tripping spring of the DC high-speed disconnector that has already been proposed. Specifically, tripping is possible in about 4 to 5 ms after detection.

In addition, the operation mechanisms of DC high-speed disconnectors that have already been proposed for the closing, tripping, and closing preparation operations use tripping spring return springs, scale springs, wipe springs, etc. A pair of trip springs ensure all operations in high-speed shredder disconnectors.

In the above-described embodiment, the charging mechanism is electromagnetic, but pneumatic charging is also possible. FIG. 4 shows a configuration for air injection, in which the driving force of the air injection mechanism 31 is transmitted from the L-shaped lever 20 to the rod 18.

As explained above, the operating mechanism of the DC high-speed disconnector of the present invention skillfully uses four links.
The contact can be opened reliably and quickly without impairing high-speed shearing characteristics. Moreover, it has extremely great effects, such as reducing the number of parts and simplifying the structure, resulting in significant cost reductions.

[Brief explanation of the drawing]

Figures 1 to 3 are configuration diagrams showing one embodiment of the operation mechanism of the DC high speed shield breaker according to the present invention.
2 is a diagram showing a closed pole state, FIG. 2 is a diagram showing an open pole state, FIG. 3 is a diagram showing a charging preparation state, and FIG. 4 is a diagram showing the configuration in the case of air charging. 3... Blowing coil, 4... Holding coil, 5...
Tripping coil, 6... Fixed iron core, 7... Fixed contact, 8... Movable contact, 9... Contact stand, 10...
...Mounting arm, 11, 16, 17, 19, 21, 2
2, 27...pin, 12...tripping spring, 14...
...Movable iron core, 15...Trip arm, 18...Rod, 20...L-shaped lever, 24...Magnetic pole, 25...
...Exciting coil, 26...Movable magnetic pole, 28...Fault current detector, 29...Tripping device, 30...Stopper.

Claims (1)

[Scope of utility model registration request] A micro-reed switch type overcurrent detection device that detects the magnetic field due to the overcurrent flowing in the main circuit, a silicon-controlled rectifier that conducts by the output signal of the overcurrent detection device, and a silicon-controlled rectifier that conducts by the conduction of the silicon-controlled rectifier. A tripping device comprising a discharging capacitor for supplying a charging current to a tripping coil, and a high-speed breaker which is operated by excitation of the tripping coil to open a movable contact, at one end. a tripping arm to which a movable iron core is attached and rotatably connected to the mounting arm of the movable contact at the other end; a tripping arm connected to the tripping arm at one end and coupled to the mounting base of the movable contact at the other end; The mounting arm is connected to the mounting arm, the rod is connected to the center of the mounting arm and moves it up and down, and the lever is connected to the other end of the rod and transmits the driving force of the loading mechanism to the rod. An operation mechanism for a DC high-speed disconnector, characterized in that the movable contactor can be opened and closed even during a closing operation using the four rings.