Gas Circuit Breaker Resistance Contact Layout to Prevent Reignition
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Solution Overview
Problem
Gas circuit breakers face issues with reignition during small current interruptions due to insufficient insulation distance between the mover-side resistance contact and the stator-side shield, leading to potential overvoltage and increased weight and part count.
Innovation Solution
A gas circuit breaker design with a stator-side resistance contact supported by springs and dashpots, allowing it to move closer to the mover-side resistance contacts, ensuring a reduced distance between them and the main contacts, thus preventing reignition and reducing the number of parts and weight by using a common power transmission path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate power transmission paths are used for the main breaking unit and resistance closing unit, then each unit can be independently controlled, but the number of parts increases causing increased weight and arc-extinguishing chamber size
Solution Approach 1:
The patent combines the power transmission paths for the main breaking unit and resistance closing unit into a single common path. The operating device transmits driving force through this common path to control both the main contacts and resistance contacts, reducing the number of parts and overall weight while maintaining coordinated control of both units.
2Ease of operation
If separate power transmission paths are used for the main breaking unit and resistance closing unit, then each unit can be independently controlled, but the arc-extinguishing chamber size increases
Solution Approach 1:
The patent combines the power transmission paths for the main breaking unit and resistance closing unit into a single common path. The operating device transmits driving force through this common path to control both the main contacts and resistance contacts, reducing the number of parts and overall weight while maintaining coordinated control of both units.
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
The design effectively suppresses reignition during small current interruptions while reducing the weight and part count, ensuring reliable operation and efficient overvoltage suppression.
Implementation Method 1
a spring and a dashpot supporting the stator-side resistance contact from a direction opposite to a direction in which the stator-side resistance contact faces the mover, the spring and the dashpot supporting the stator-side resistance contact such that the stator-side resistance contact is movable in the axial direction of the tank, the spring and the dashpot biasing the stator-side resistance contact in a direction in which the stator-side resistance contact approaches the mover
Implementation Method 2
a spring and a dashpot supporting the stator-side resistance contact from a direction opposite to a direction in which the stator-side resistance contact faces the mover
Implementation Method 3
gas compressed in the puffer cylinder passes through the inside of the nozzle to cool an arc generated between the arcing contacts
Implementation Method 4
gas compressed in the puffer cylinder passes through the inside of the nozzle to cool an arc generated between the arcing contacts
Data Source
AI summary
A gas circuit breaker including: a cylindrical tank; a stator fixed inside the tank; and a mover disposed so as to face the stator. The mover is movable between a closing position and a cutoff position, the mover is in contact with the stator when located in the closing position, and the mover is out of contact with the stator when located in the cutoff position. The stator includes: a stator-side main contact fixed inside the tank; a stator-side resistance contact having a ring shape surrounding the stator-side main contact; and a spring and a dashpot supporting the stator-side resistance contact from a direction opposite to a direction in which the stator-side resistance contact faces the mover. The mover includes: a mover-side main contact disposed so as to face the stator-side main contact; and a mover-side resistance contact disposed in such a way as to face the stator-side resistance contact.