JPS58189927A - Vacuum 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] Is the present invention a vacuum system? This invention relates to a vacuum pulp suitable for insulation in vacuum pulp vessels, particularly for resistance cutoff for suppressing surge voltage.

Conventional vacuum pulp has the high arc-extinguishing performance of vacuum, which causes the electric current cutting phenomenon in which the current is cut off before the current reaches the current point in the interrupter, and the high breaking current of several kilohertz or more. A large surge voltage is generated due to the multiple electric spark phenomenon caused by the interruption. As a method of suppressing this, a capacitor, or a capacitor, a resistor, and a non-linear resistor were installed between the load side terminal of the Shiya WJT device and the ground separately from the breaker, which had the disadvantage of increasing the space of the device. Nine. Also, its surge suppression effect is
The surge voltage could not be suppressed to near zero.

An object of the present invention is to create a vacuum that does not generate surge voltage. The goal is to provide a disconnect.

In the vacuum breaker of the present invention, in order to prevent the generation of surge voltage, the main contact, the resistor, and the resistance contact are contained in vacuum pulp, and after the main contact opens, the resistance contact opens after a certain period of time. Its purpose is to absorb surge voltage.

An embodiment of the F1 invention will be described below with reference to FIGS. 1 and 2.

In the vacuum pulp IA, a vacuum container 4A is formed by a fixed conductor 1, a fixed terminal plate 2, a seal ring 3, an insulator, a movable terminal plate 6, a bellows 7, and a movable conductor 8, and the interior is 5 x 1.
It is maintained at a high vacuum of 0-' Torr or less. The fixed electrode &9 and the movable electrode 10, which are the main contacts, can be separated via the bellows 7 by operating force of an operating device (not shown) while maintaining a vacuum.

The insulator 4 is made of ceramics with high insulation resistance, the resistor 5 is made of ceramics set to a constant resistance value, and the insulator 4 and the resistor 5 are sintered at the same time, so that they are integrally formed. It forms a vacuum container of 4 people. In addition to the main contact formed by the fixed electrode 9 and the movable electrode 10, there are also a fixed auxiliary shield 12, a fixed resistance contact 13. Resistor 5. Movable resistance contact 15. A resistive contact 130 is formed on the movable auxiliary shield 14.

In the breaking operation, from the closed state shown in FIG. 1, first the movable main contact 10 is opened by the fixed electrode 9, but in the initial state of opening, the resistance contact 130 is still connected and in a good state. After 1/2 cycle or more has elapsed since the main point 9.10 is opened as shown in FIG. 3, the movable resistance contact 15
When the main contact and the resistive contact 130 are in a positional relationship such that the resistive contact 130 passes through the boundary between the main contact and the insulator 4 and the resistive contact 130 is opened, the breaking operation is completed when the state shown in FIG. 2 is reached.

Electrically, when the main contact 9.10 opens, an arc occurs between the fixed 11 pole 9 and the movable electrode 10, and the current reaches zero within 1/2 cycle after the main contact opens. , or due to current flow phenomenon, the arc at the main contact is extinguished and the current at the main contact is cut off.

However, within 1/2 cycle after JII between the main contacts, since the resistance contact 130 is connected, t
Even if a new phenomenon occurs, no abnormal voltage will occur on the breaker load side. The disconnection is completed when the resistive contact opens.

This new phenomenon occurs only when a small 11 LfL of several amperes or more is cut off, and a vacuum circuit breaker always cuts off a current of several amperes or less in 1/2 cycle or less. do. Therefore, main contact tune *after 1/
The resistance point may be opened after two or more cycles have passed.

FIG. 3 shows the stroke curve of the above-mentioned shutoff operation. 1/3 of the total opening required for short-circuit current interruption
By opening and opening the above at a fast speed and the remaining 2/3 or less at a slow speed, the resistance contact is opened after 1/2 cycle or more has elapsed after the main contact opens, without increasing the main contact stroke. becomes possible.

As described above, it is possible to suppress the surge voltage to near zero without grounding the surge absorber separately from the vacuum breaker.

Built-in resistance contacts and resistors in vacuum pulp, or
By forming part of the insulating cylinder of the vacuum pulp with a resistor, there is no need to provide a resistor and a resistive contact separately from the vacuum pulp9, and the external dimensions of the Makabe breaker with a resistive contact can be significantly reduced. Furthermore, reliability can be improved by installing resistance contacts in a vacuum with high pressure resistance.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side lrr view showing the feeding state of vacuum pulp according to the present invention, FIG. 2 is an ffc cross-sectional view showing the state of vacuum pulp being kneaded into a cut shape from the state shown in FIG. 1, and FIG. FIG. 3 is a stroke characteristic diagram of the main contact of a vacuum breaker according to the invention.

Claims (1)

[Claims] 1. At least one pair of electrodes are arranged correspondingly in a vacuum container,
These conductive rods extend outside the vacuum vessel from the electrode surface, and the conductive rods are moved 10,000 sides so that one electrode comes into contact with and separates from the other, and is attached to the conductive rod inside the vacuum vessel. A resistive contact is placed in a vacuum vessel, and when the electrode is closed, both resistive contacts are shorted, and when the electrode is open,
A vacuum breaker comprising a moving resistor image point and a non-contact resistor.