Locking System for CT Secondary Short-Circuit Safety
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Solution Overview
Problem
Current transformer secondary circuits pose a safety risk due to the development of high voltages when disconnected, leading to potential accidents and equipment damage, and existing solutions like crossover terminals require careful manual operation and result in unnecessary equipment disconnections and costs.
Innovation Solution
A multipole plug and receptacle system with automatic short-circuit capability between poles, which short-circuits the current transformer secondary before disconnecting the circuit, preventing dangerous voltage development and allowing safe disconnection without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual short-circuiting procedure is used with crossover terminals, then safety risk is reduced, but operation complexity and human error possibility increase
Solution Approach 1:
The patent applies preliminary action by automatically establishing the short-circuit connection between transformer secondary terminals before the disconnection process begins. The locking system pre-configures the short-circuit path, so that when disconnection occurs, the terminals are already protected from high voltage development. This eliminates the need for manual short-circuiting operations and their associated risks.
Solution Approach 2:
The locking system performs the short-circuiting function automatically without requiring operator intervention. The system self-manages the safety function by detecting the disconnection state and activating the short-circuit path accordingly. This transforms a manual safety procedure into an automated self-protecting system.
2Reliability
If equipment disconnection is performed to prevent high voltage risks, then safety is improved, but productivity and operational efficiency deteriorate
Solution Approach 1:
The locking system establishes the short-circuit protection in advance, before any disconnection operations are needed. This preliminary configuration allows maintenance and operational activities to proceed without requiring full equipment disconnection, as the safety condition is already in place. Equipment can remain connected and operational while the locking system manages the short-circuit function.
Solution Approach 2:
The patent enables continuous operation and maintenance activities without interrupting the useful action of the equipment. By maintaining the short-circuit path through the locking system, the equipment can remain energized and functional during routine operations, eliminating unnecessary shutdowns and maintaining productivity while ensuring safety.
3Ease of operation
If multipole plug and receptacle system is used without automatic short-circuit, then ease of connection is improved, but risk of accidental opening and high voltage development increases
Solution Approach 1:
The patent merges the connection function and the short-circuit protection function into a single integrated locking system. The locking mechanism simultaneously performs both the electrical connection and the establishment of the short-circuit path between transformer secondary terminals. This combination ensures that the ease of plug-and-play connection does not compromise safety, as both functions are achieved together through one operation.
Solution Approach 2:
The locking system acts as an intermediary between the plug and receptacle, mediating both the electrical connection and the safety function. It introduces a intermediate mechanism that manages the short-circuit path independently from the main connection operation, ensuring that even if the plug-receptacle connection is accidental or improper, the transformer secondary remains protected through the locking system's short-circuit function.
Data Source
AI summary
Electrical circuit quick connection and disconnection system with automatic short circuit of current transformer secondaries and similar devices, consists of a multipole plug (6) and receptacle (11) system with automatic short-circuit capacity between the poles (7, 12) upon initiation of disconnection between the plug (6) and the receptacle (11), without incurring in the temporary opening of the circuit, for application in current transformer (3) secondary circuits (3B) and other applications requiring the same characteristics. The system is equipped with a number N of paired poles (7, 12), being that each pair of poles (7, 12) is connected to a CT (3) secondary (3B), therefore handling the connection of N CT (3) secondaries (3B). Each pair of poles (J, 12) is equipped with a system that, under normal conditions of use, that is, with the plug (6) and the receptacle (11) connected, allows the normal passage of current from the CT (3) secondary (3B) to the load (14) connected to the latter, without short-circuiting the CT (3) secondary (3B).