Power Switchgear Surge Suppression Apparatus Integration
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Solution Overview
Problem
Conventional power switchgear systems face issues with insulation deterioration and dielectric breakdown due to switching surges, which require a surge suppression apparatus like a lightning arrester, but this increases the substation area and can prevent the adoption of power switchgear in space-constrained environments.
Innovation Solution
A power switchgear design incorporating a ground tank with a vacuum switch tube, insulation supporters, and a surge suppression apparatus integrated within a hermetically sealed insulation cylinder, allowing for reduced insulation distance and compact placement without increasing the switchgear's footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surge suppression apparatus is placed outside the power switchgear, then the insulation distance to other facilities is secured, but the substation area is increased
Solution Approach 1:
The surge suppression apparatus is integrated into the power switchgear by placing it inside the ground tank, merging two previously separate components into one unified structure. This eliminates the need for separate placement while maintaining electrical insulation through the vacuum environment and insulating supports.
Solution Approach 2:
The surge suppression apparatus is nested within the ground tank of the power switchgear, with the arrester body positioned inside the vacuum environment. The insulating supports and sealing structures enable this nested configuration while maintaining proper electrical insulation distances.
2Area of stationary object
If a surge suppression apparatus is placed inside the ground tank, then the substation area is reduced, but the insulation distance and hermetic seal must be maintained
Solution Approach 1:
The surge suppression apparatus is nested within the ground tank, with the arrester body positioned inside the vacuum environment. The insulating supports and sealing structures enable this nested configuration while maintaining proper electrical insulation distances.
Solution Approach 2:
A flange structure acts as an intermediary component between the ground tank and the surge suppression apparatus, providing both hermetic sealing and electrical insulation. This intermediary element enables the integration while maintaining the vacuum seal and electrical isolation required for proper operation.
3Area of stationary object
If the surge suppression apparatus is integrated into the power switchgear, then the occupation space is reduced, but the apparatus must be detachable for maintenance
Solution Approach 1:
The surge suppression apparatus is designed as a separable module that can be detached from the ground tank for maintenance or replacement. The flange connection provides a standardized interface that enables easy installation and removal without requiring complex disassembly procedures.
Solution Approach 2:
The connection between the surge suppression apparatus and the ground tank is designed to be dynamically changeable - permanently fixed during operation for compact integration, but easily detachable when maintenance is required. This dynamic configuration balances space efficiency with serviceability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables effective suppression of surge voltage-induced insulation deterioration and dielectric breakdown without the need for additional space, allowing for the compact integration of surge suppression apparatuses within the power switchgear, reducing the required area and simplifying maintenance.
Implementation Method 1
chopping phenomena, which interrupt current when a current value of a circuit decreases to several amperes, are generated and accordingly a switching surge several times as large as circuit voltage is generated due to the chopping phenomena
Implementation Method 2
a conical shaped insulator which is placed on an opening portion provided at a part of the ground tank, and whose tip end portion is inserted in the ground tank; an insulation cylinder which is placed at a rear end portion of the conical shaped insulator
Implementation Method 3
an insulation cylinder which is placed at a rear end portion of the conical shaped insulator so as to cover the inside of a conical concave portion of the conical shaped insulator, and protrudes to the outside of the ground tank; and a surge suppression apparatus which is placed inside the insulation cylinder while maintaining hermetic seal
Data Source
AI summary
A power switchgear includes: a vacuum switch tube in a ground tank; a movable side conductor which passes through the ground tank to connect to one side of the vacuum switch tube, and extends to the upper side of the tank; a fixed side conductor which passes through the ground tank and connects to another side of the vacuum switch tube, and extends to the upper side of the tank. A conical insulator is placed on an opening of the ground tank, and a tip end is inserted in the ground tank; an insulation cylinder is placed at a rear end of the conical insulator to cover the inside of a concave portion of the conical insulator, and protrudes outside the ground tank; and a surge suppression apparatus inside the insulation cylinder has a terminal in the conical insulator and connected to a main circuit of the vacuum switch tube.