Portable Switching Device for Remote High Voltage Circuit Breaker Operation
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Solution Overview
Problem
High voltage circuit switching often results in arc flashes, posing serious safety risks to operators due to extreme temperatures, pressure, and sound waves, with existing solutions being either expensive or ineffective in preventing flashes, and lacking portability and reusability.
Innovation Solution
A portable switching device with a second switching circuit, relay protection, and arc quenching magnet, allowing remote operation of circuit breakers, equipped with overvoltage and overload protection, and wireless control, designed for use with existing switchgear to minimize risk and facilitate safe switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If operators manually actuate buttons on circuit breaker housing, then switching operation is simple and direct, but operators are exposed to arc flash hazards including extreme temperatures up to 19,000°C, pressure waves, and sound waves
Solution Approach 1:
The patent introduces a portable switching device as an intermediary between the operator and the circuit breaker. The device includes a switching unit with relay that remotely actuates the circuit breaker's closing and opening mechanisms, allowing operators to perform switching operations from a safe distance without direct contact with the circuit breaker housing, thereby eliminating exposure to arc flash hazards while maintaining operational simplicity
Solution Approach 2:
The patent replaces the manual mechanical button-actuation system with an electronic remote control system. The portable switching device uses electronic relays and control circuits to remotely activate the circuit breaker's electromagnetic closing and opening mechanisms, substituting direct mechanical interaction with wireless or remote electronic control, thus protecting operators from harmful arc flash effects
2Object-affected harmful factors
If switchgear is wired to control room or remote racking is used, then operators are removed from vicinity, but these solutions are expensive and require replacing or retrofitting existing switchgear
Solution Approach 1:
The portable switching device is designed as a universal, multi-functional unit that can be applied to various types of existing circuit breakers without requiring customization or retrofitting of the switchgear. The device includes adaptable connection terminals and a versatile relay interface that works with different circuit breaker models, enabling remote operation while maintaining compatibility with existing equipment and avoiding expensive replacement or modification costs
Solution Approach 2:
The portable switching device acts as a standalone intermediary unit that interfaces between the operator and existing circuit breakers. Rather than requiring integration into the switchgear infrastructure, the device operates as an independent remote control system that can be easily connected to existing breakers, thus avoiding the high costs associated with control room wiring or remote racking installations
3Object-affected harmful factors
If magnetic switch actuators are used, then operators are removed from vicinity, but these devices may be irreparably damaged by arc flashes
Solution Approach 1:
The portable switching device serves as a protected intermediary that performs the remote actuation function while being designed to withstand or protect against arc flash damage. The device includes protective enclosures, arc-resistant materials, and remote operation capability that allows it to safely interface with circuit breakers without suffering irreparable damage from arc flashes, ensuring long-term reliability
Solution Approach 2:
The portable switching device incorporates protective measures beforehand to prevent arc flash damage. This includes using arc-resistant materials in the construction of the device housing, implementing protective barriers between the device and the circuit breaker, and designing the relay and electronic components to be protected from thermal and electromagnetic effects of potential arc flashes, thus ensuring device durability
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
Enables safe and secure remote operation of high and low voltage circuit breakers, reducing the risk of arc flashes by quenching arcs and providing a portable, reusable solution for various electrical circuits, thus protecting operators from hazardous conditions.
Implementation Method 1
The relay protection circuit may comprise an RC snubber circuit connected in parallel with a relay contact of the relay(s). The placement of the snubber across the power switching relay supresses voltage spikes and damps the ringing caused by circuit inductance when the relay/switch opens.
Implementation Method 2
The relay may comprise an internal magnet configured for arc quenching. The magnet which is positioned above the relays contacts creates a magnetic field. When the relay contacts open an arc is formed. The arc is drawn towards the magnetic field thus stretching the arc and pulling the arc towards the magnetic field thus weakening the arc and quenching or extinguishing the arc
Implementation Method 3
The arc is drawn towards the magnetic field thus stretching the arc and pulling the arc towards the magnetic field thus weakening the arc and quenching or extinguishing the arc
Data Source
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AI summary
A portable switching device to remotely operate a high voltage circuit breaker, the portabele switching device is locally temporarily electrically connected to the controling ciruit of the high voltage circuit breaker and comprises: a voltage input (206); a voltage output (208, 210) for connecting to the external circuit; a ground input (212); an overvoltage protection circuit (201) connected between the voltage input (206) and the ground input (212); and a switching unit (203, 205) comprising a first switching circuit having an input connected to the voltage input and an output connected to the voltage output, the first switching circuit comprising a relay (2032), a relay contact protection circuit (2034), and an overload protection circuit (2036); wherein the first switching circuit is remotely controllable to switch the external circuit from a first operating state to a second operating state.