Cable connecting housing for ultrahigh-voltage GIS breaker switch

Abstract

The invention relates to a cable connecting housing for a ultrahigh-voltage GIS breaker switch. By means of structural design that a manner that three-phase cable terminal connecting small-opening flange is directly designed on the end portion of a main housing, which substitutes for a manner that three-phase cables are indirectly installed on a large-opening flange on the main housing through a cable connecting middle flange, installing technology is simplified and equipment cost is reduced. A cable built-in area of the main housing is locally expanded in order that a cable built-in space is expanded, distance between the three-phase cables is increased and arcing and discharging is prevented among the three-phase cables. A connecting flange utilizes water / air double seal groove structure so as to improve a sealing and protecting capability. The orientation of an explosion-proof disk is changed in order that an explosion-proof sheet leaves towards an inclined outer side when being fractured for protecting an adjacent device. An inflation / exhaust-integrated inflating nozzle structure is used and can be filled with and exhaust SF6. A hosting hole is arranged on the top of a housing in order to facilitate equipment installation.

Description

technical field [0001] The invention relates to a cable connection housing, in particular to a casting aluminum alloy cable connection housing used for a switchgear of an ultra-high voltage GIS circuit breaker. Background technique [0002] The cable connection shell is the key structural part of the GIS circuit breaker switchgear. In addition to the general functional use required by GIS for the shell, its main function is to install the terminal of the three-phase cable and connect the circuit to the broken circuit through the conductor inside the shell. Switching equipment such as switch, isolating switch, and grounding switch connect the GIS switching equipment with the external power supply line, thereby controlling the opening and closing of the entire transmission and distribution line. [0003] Such as figure 1 As shown, the cable connection housing Y100 of an ultra-high voltage GIS circuit breaker has external dimensions length × width × height = 1000 mm × 850 mm...

AI Technical Summary

Problems solved by technology

[0004] The cable connection flange Y104 of the existing cable connection housing is a large opening flange, and the 3-phase cable cannot be directly installed on the Y104, and must pass through figure 2 The shown cable terminal is connected to the intermediate flange B200 for indirect installation. First install B200 on Y104, and then install the three-phase cables on B200 respectively on the cable terminal connected to small opening flanges B201, B202, and D203. Equipment installation / Maintenance is inconvenient and increases the equipment cost; if image 3 As shown, the internal space of the cable built-in area D300 of the existing cable connection shell is narrow, and the distance between the three-phase cables is too small, which may easily cause arcing and discharge between each other, resulting in unplanned power outages; the existing cable connection shell The explosion-proof disk structure Y109 is used to install the explosion-proof disk device, which is an important safety device of the shell. The discharge system of the installed explosion-proof disk device works last to prevent major accidents. The existing explosion-proof disk structure is located in the center of the horizontal line on the side of the shell body When the explosion-proof plate breaks or falls off, its detachment direction is towards the side, which will damage other adjacent equipment; the existing cable connection shell has two observation windows Y110 and Y111, but the field of view of the observation windows cannot cover the entire internal space, so It is convenient to observe the running state of the internal structural parts; the existing cable connection housing has two SF6 gas filling nozzle structures Y112 and Y113, and the gas charging nozzles used can only fill but not discharge SF6 gas. Once the internal pressure exceeds the upper limit, it will inevitably cause the equipment Fault

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