Three-Phase Arc Quenching with One Pyrotechnic Actuator
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Solution Overview
Problem
Existing arc quenching devices for three-phase electrical switchgear require multiple pyrotechnical actuators to short-circuit all phases, increasing complexity and cost, and often fail to quench arcs quickly enough to prevent damage.
Innovation Solution
A three-phase arc quenching device using only one pyrotechnical actuator to axially move conductive pistons with a tapered shape, allowing all busbars to be short-circuited simultaneously, reducing the need for synchronized firing and simplifying the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pyrotechnical actuators are used to short-circuit all phases, then the arc quenching capability is improved, but the device complexity and cost increase
Solution Approach 1:
Multiple pistons that were previously driven by separate actuators are merged into a single integrated piston structure that can be driven by one pyrotechnical actuator. This piston simultaneously contacts all three phase busbars to create a common short-circuit path, reducing the actuator count from three to one while maintaining arc quenching capability.
Solution Approach 2:
The single pyrotechnical actuator is designed to perform multiple functions: it simultaneously drives the piston to contact all three phases (L1, L2, L3) to create a common short-circuit path. This multi-functional design eliminates the need for multiple specialized actuators, reducing system complexity while achieving the same protective effect.
2Reliability
If multiple pyrotechnical actuators are used, then each phase can be short-circuited independently, but synchronization of firing becomes necessary and complex
Solution Approach 1:
The invention merges the short-circuiting function for all three phases into a single piston movement action. Instead of requiring three separate actuator firings to be synchronized, one actuator drives one piston to simultaneously establish electrical contact with all three phases, eliminating the synchronization problem entirely.
Solution Approach 2:
The piston is designed with multiple contact points or segments that simultaneously engage with different phases. This segmentation allows a single piston movement to achieve what previously required multiple separate actions, with each segment of the piston contacting a different phase at the same time.
3Reliability
If circuit breaker is used to interrupt fault currents, then the switching capability is improved, but the opening time becomes relatively long (30-60 ms)
Solution Approach 1:
The pyrotechnical actuator creates a preliminary short-circuit path by driving the piston to contact all phases simultaneously, establishing a low-impedance path before the main circuit breaker operates. This preliminary action redirects the fault current through the piston, enabling faster arc quenching within 2 ms rather than waiting for the circuit breaker's 30-60 ms operation.
Solution Approach 2:
The piston acts as an intermediary device between the fault condition and the main circuit breaker. It provides a controlled short-circuit path that quickly quenches the arc by equalizing phase potentials, serving as a fast-acting mediator that bridges the gap between immediate protection needs and the slower circuit breaker response.
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 solution enables faster arc quenching within 0.1-2 ms, reducing damage and complexity by using a single pyrotechnical actuator to short-circuit all phases, thereby improving the efficiency and cost-effectiveness of the arc quenching process.
Implementation Method 1
one pyrotechnical actuator arranged to, when the pyrotechnical actuator is fired, axially move each of the at least one piston
Data Source
AI summary
An arc quenching device for a three-phase electrical switchgear. The device includes a first busbar, a second busbar and a third busbar, each of a respective phase of the three-phase switchgear. The device also includes at least one piston of an electrically conductive material and having a tapered shape, tapering towards its front end. The device also includes only one pyrotechnical actuator arranged to, when the pyrotechnical actuator is fired, axially move each of the at least one piston until all of the first, second and third busbars are short-circuited to each other via the at least one piston.