Interlocking Structure for Power Conversion System Maintenance
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Solution Overview
Problem
Conventional mechanical interlock mechanisms in power systems are complex and prone to improper operations, often resulting in sequence errors or interruptions during maintenance, due to the need for multiple locking devices and keys which can be lost or confused.
Innovation Solution
An interlocking structure for a power conversion system that includes a first and second power circuit group connected in parallel, with a limiting mechanism allowing controlled switching of circuit breakers to disconnect one power source and connect another without interrupting power supply, using a movable limiting structure and accommodating portions to prevent simultaneous operation of circuit breakers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple locking devices and keys are used in conventional mechanical interlock mechanisms, then the power system can achieve interlocking control between multiple circuit breakers, but the complexity of operation increases and the risk of losing or confusing keys increases
Solution Approach 1:
The patent combines multiple locking devices into a single integrated limiting mechanism that can simultaneously control multiple circuit breakers. The limiting mechanism includes a limiting bar with multiple limiting portions that can block several circuit breakers at once, eliminating the need for separate locking devices and keys for each breaker.
Solution Approach 2:
The limiting mechanism serves multiple functions: it can limit different circuit breakers in different sequences, accommodate multiple limiting portions on a single bar, and provide universal control across the power circuit group. This multi-functional design replaces the need for multiple specialized locking devices.
2Reliability
If conventional mechanical interlock mechanisms use multiple locking devices, then interlocking control can be achieved, but the operation process becomes complex and prone to sequence errors
Solution Approach 1:
The limiting bar is designed to be movable rather than fixed, allowing it to be dynamically positioned to limit different circuit breakers as needed. The limiting portions can be selectively engaged or disengaged from circuit breakers, providing flexible and adaptive control that simplifies the operation sequence.
Solution Approach 2:
The limiting bar acts as an intermediary element between the operator and multiple circuit breakers. By manipulating a single limiting bar instead of multiple independent locking devices, the operator gains simplified control over the interlocking sequence, reducing the cognitive load and potential for errors.
3Adaptability or versatility
If circuit breakers can be operated independently, then flexibility in operation is maintained, but improper operations such as simultaneous switching or sequence errors can occur
Solution Approach 1:
The limiting portions on the limiting bar proactively prevent improper operations by physically blocking circuit breakers that should not be operated at certain times. This preliminary restriction prevents sequence errors before they can occur, while still allowing legitimate operations when the limiting bar is positioned appropriately.
Solution Approach 2:
The limiting mechanism automatically maintains proper operation sequences through its mechanical design. As circuit breakers are operated, the limiting bar's position and the engagement of limiting portions self-regulate to prevent improper subsequent operations, eliminating the need for external monitoring or control systems.
Data Source
AI summary
An interlocking structure of a power conversion system is provided. A first power circuit group is connected to a first power source and includes a first and a fourth switch. A second power circuit group is connected to a second power source and includes a second and a fifth switch. A limiting mechanism includes a first limiting portion, a second limiting portion, a fourth limiting portion, a fifth limiting portion, a first accommodating portion, and a second accommodating portion. The first switch is switched off to disconnect the first power source. Then, a limiting structure is moved to connect the second power source. Accordingly, the first power source is disconnected, and the second power source is connected, allowing repair or maintenance of the first power source to be performed without interrupting the supply of power from the power conversion system.