Protective Relay Test Equipment Operation Device
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Solution Overview
Problem
Protective relay test equipment requires multiple programs for various types of relays, leading to delayed testing when these programs are not pre-secured, and existing solutions do not efficiently secure operating data without affecting the relay's performance.
Innovation Solution
A protective relay test equipment operation device with a switch unit, measurement unit, and calculation unit that measures voltage and current, calculates impedance, and generates performance information by displaying impedance trajectories and comparing them with reference impedances, allowing for efficient data acquisition and improved connection compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate programs are used for different types of protective relays, then the protective relay test equipment can test various relay types, but the test schedule is delayed when programs are not secured in advance
Solution Approach 1:
The patent implements a universal test equipment system that can test multiple types of protective relays (distance relay, differential relay, overcurrent relay, etc.) using a single integrated program. The system automatically identifies the relay type and selects appropriate test parameters, eliminating the need for multiple separate programs and reducing test scheduling delays.
Solution Approach 2:
The system dynamically adjusts test parameters based on the identified protective relay type. The control unit modifies test signal characteristics, measurement ranges, and evaluation criteria according to the specific relay type being tested, enabling versatile testing functionality through parameter adaptation rather than separate programs.
2Reliability
If test signal is injected into protective relay to test malfunction, then the relay performance can be verified, but the test signal may affect the operating data of the protective relay
Solution Approach 1:
The measurement unit captures operating data at critical time points (before test signal injection, during test signal application, and after test signal removal) with high-speed sampling. This allows the system to quickly acquire accurate operating data while minimizing the duration of test signal exposure, thereby reducing the impact on relay operating data.
Solution Approach 2:
The system continuously monitors the protective relay's operating data during testing and compares it with expected values. The control unit adjusts test signal parameters in real-time based on feedback from the measurement unit, ensuring that testing proceeds without causing harmful effects to the relay's normal operation.
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 easy and accurate acquisition of operating data for protective relays, reducing test signal impact and improving connection compatibility, thus supporting smooth performance checks and reducing test delays.
Implementation Method 1
a measurement unit measuring a voltage and a current between the first port and the second port during a test period
Implementation Method 2
a measurement unit measuring a voltage and a current between the first port and the second port during a test period
Implementation Method 3
a calculation unit calculating impedance for each of a plurality of time points within the test period according to the measurement result of the measurement unit
Data Source
AI summary
A protective relay test equipment operation device according to an embodiment of the present invention may comprise: a switch unit for, upon reception of a trip signal or a close signal from a protective relay, changing an electrical connection state between a first port configured to be electrically connected to test equipment that generates a test signal and a second port configured to be electrically connected to the protective relay; a measurement unit for measuring a voltage and a current between the first port and the second port during a test period in which an operation time point of the switch unit is a start time point or an end time point; and a calculation unit for calculating a plurality of time point-specific impedance values within the test period according to a measurement result of the measurement unit.