Rogowski Coil Test Circuit for GIS Protection Path Verification
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Solution Overview
Problem
Existing test methods for Rogowski coils and their associated protection circuits in Gas Insulated Switchgears (GIS) are inadequate as they cannot simulate high currents and do not effectively test the upstream components of the protection system.
Innovation Solution
A test device that generates a test voltage representative of the secondary signal generated by a Rogowski coil, allowing for the simulation of high currents and the testing of the protection circuit and conductors connected to the coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a test current is directly injected into the protection system to test protection functions, then the protection devices can be tested, but the components upstream of the digitalization stage (wires, integrator, coil) are not tested
Solution Approach 1:
The invention creates a test circuit that copies the actual operating conditions of the Rogowski coil by generating a test voltage that simulates the secondary voltage signal the coil would produce during normal operation. This allows the entire signal path including the coil, wires, and integrator to be tested without requiring actual high current flow through the conductor.
Solution Approach 2:
The invention introduces a test voltage generator as an intermediary device that bridges the gap between the available test equipment (which can only generate low voltages) and the requirements of the protection system (which expects high voltage signals from the coil). The test circuit acts as a mediator that transforms accessible test signals into representative coil output signals.
2Reliability
If high currents (up to 100 000 A) are used to simulate real defaults for testing, then the protection circuit operation can be verified, but portable generators can only generate several tens or hundreds of A
Solution Approach 1:
The invention changes the test parameter from current (which requires enormous power) to voltage. By generating a test voltage that is representative of the secondary voltage signal the Rogowski coil would produce during high current events, the test can be performed with low power portable equipment while still verifying the protection circuit's response to actual high current conditions.
Solution Approach 2:
The invention replaces the mechanical/electrical system of directly injecting high current through the conductor and coil with an electrical signal simulation approach. Instead of physically creating the high magnetic field that would result from 100 000 A current, the test circuit electrically simulates the voltage output that such a field would produce in the coil.
3Ease of operation
If the test current is injected directly to the digitalization stage, then the test setup is simple, but the test conditions are not representative of the actual signal generated by the coil
Solution Approach 1:
The invention performs preliminary transformation of the test signal before it reaches the protection system. By pre-generating a test voltage that already resembles the actual coil output signal, the test ensures that all components in the signal path (wires, integrator, compensation stage) are exercised under conditions that accurately represent their normal operating environment.
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 test device enables the effective testing of Rogowski coils and their protection systems by simulating actual current conditions, ensuring proper operation of protection devices and identifying potential defects.
Implementation Method 1
the magnetic field created by the primary current which usually circulates in conductor 2 generates a voltage at the terminals 7, 9 of the coil
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
The invention relates to a test device (20) to test a Rogowski coil (4) and an associated protection device (8) connected to said coil via conductors (13), comprising: - means (21) to generate at least one test voltage; - transformation means (22) to transform said test voltage into a voltage representative of a secondary signal generated by said Rogowski coil (4), said transformation means (22) comprising output terminals (231, 232) for connection to conductors (13); - means (226) to process an output voltage of said coil.