Electric contact for vacuum valve and vacuum interrupter using the same

An electrical contact and vacuum valve technology, which is applied to high-voltage air circuit breakers, circuits, contacts, etc., can solve the problems of insufficient sintering, failure of electrical contacts to obtain energization performance and circuit breaking performance, and damage to the soundness of brazing parts.

Inactive Publication Date: 2011-05-18
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] When adding several weight % of low-melting point metal, defects may be generated in the Cu matrix as a conductive component, or sintering may become insufficient, and good electrical conduction performance and disconnection performance may not be obtained at the electrical contact.
[0010] In addition, in the case of making a vacuum valve by vacuum sealing brazing, there is a risk that the low-melting point metal will volatilize from the electrical contact, impair the soundness of the soldered part, and cause the vacuum degree in the vacuum valve to decrease.
[0011] In addition, when the amount of the low-melting point metal added is less than the appropriate amount, the reduction in strength of the electrical contact may be insufficient, and the effect of reducing the separation force may be insufficient.

Method used

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  • Electric contact for vacuum valve and vacuum interrupter using the same
  • Electric contact for vacuum valve and vacuum interrupter using the same
  • Electric contact for vacuum valve and vacuum interrupter using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this example, a sintered body composed of raw materials of the electrical contact 1 having the composition shown in Table 1 was fabricated.

[0036] The manufacturing method of the electrical contact 1 will be described below. First, a powder of a ternary intermetallic compound is prepared. In this example, to become 48.2Cu 2 Te-51.8Cr 2 Te 3 (wt%) mixed Cu in a mortar 2 Te and Cr 2 Te 3 Powder (with a particle size of 10 μm or less) is filled into a mold, pressurized at a pressure of 294 MPa, and then heated at 800°C for 1 hour in a vacuum to synthesize Cr 2 CuTe 4 . Crush it with a mortar to produce Cr with a particle size of 50 μm or less 2 CuTe 4 powder. Next, Cr powder with a particle size of 80 μm or less, Cu powder with a particle size of 60 μm or less, the above-mentioned Cr 2 CuTe 4 The powder was mixed with a V-shaped mixer with the composition shown in Table 1, and the mixed powder was filled into a mold, and press-molded at a pressure of 294 ...

Embodiment 2

[0045] figure 1 It is a sectional view showing the structure of an electrode. exist figure 1 Among them, 1 is an electric contact, 2 is a slot for driving the arc, 3 is a stainless steel reinforcing plate, 4 is an electrode rod, 5 is solder, and 44 is for preventing the arc from stagnating at the center of the electric contact 1. the central hole.

[0046] Carry out mechanical processing to the sintered body obtained in the embodiment, make figure 1 Electrical contacts 1 of the shape shown. In addition, the electrical contact 1 can also be obtained by filling the mixed powder into a mold that can form the final shape with the slot 2 and the central hole 44, and the electrical contact 1 can also be obtained by sintering. In this method, since subsequent processing such as machining is not required, the , which can be easily produced.

[0047] The fabrication method of the electrodes is as follows. Through machining in advance, the electrode rod 4 is made of oxygen-free co...

Embodiment 3

[0050] Using the electrode produced in Example 2, a vacuum valve was produced. The specifications of the vacuum valve are: rated voltage 7.2kV, rated current 600A, rated breaking current 20kA.

[0051] figure 2 It is a figure which shows the structure of the vacuum valve concerning this Example. exist figure 2 Among them, 1a and 1b are fixed side electric contacts and movable side electric contacts respectively, 3a and 3b are reinforcement plates, 4a and 4b are fixed side electrode rods and movable side electrode rods respectively, and they respectively constitute fixed side electrodes 6a, The movable side electrode 6b. In addition, in this embodiment, the grooves of the electrical contacts on the fixed side and the movable side are provided so as to coincide with each other on the contact surface. The movable-side electrode 6 b is soldered to the movable-side holder 12 via the movable-side shield 8 that prevents scattering of metal vapor and the like during disconnectio...

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Abstract

The present invention relates to an electric contact with a low deposit separation force and excellent electric conductivity as well as interruption characteristics. The electric contact comprises chromium, copper and Te and an intermetallic compound consisting of chromium, copper and tellurium and a chromium tissure are dispersed in a copper matrix, characterized in that: the intermetallic compound is present in grains and at grain boundaries of the copper matrix, and interfaces between the chromium and the copper.

Description

technical field [0001] The invention relates to a vacuum circuit breaker, a new type of electrical contact for vacuum valves used for vacuum switches and the like. Background technique [0002] For power distribution equipment at the user end and power supply end such as vacuum circuit breakers, miniaturization and low price are required. Therefore, it is necessary to reduce the size of the operating mechanism for opening and closing the electrical contacts by reducing the strength of the electrical contacts in the vacuum valve and reducing the separation force when the electrical contacts are welded to each other by Joule. Cr-Cu-based sintered alloys are often used for electrical contacts, and a method of adding low-melting-point metals such as Te is used as a means of lowering the strength. [0003] It is necessary to add a low-melting-point metal as an anti-welding component or to suppress roughening of the contact surface after current interruption, in an amount of seve...

Claims

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Application Information

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IPC IPC(8): H01H1/02H01H11/04H01H33/664
CPCH01H11/048H01H33/6643H01H1/0206
Inventor 菊池茂马场升森田步薮雅人中村清美
Owner HITACHI LTD
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