Which relay test kit suits me ? Which points to consider while selecting a model of a relay test kit ?
- KPM Tech Team
- Jun 3, 2024
- 4 min read
Updated: Apr 16
The type and complexity of relays you need to test significantly influence the choice of relay test kit. Different relays have various functionalities, operating principles, and requirements that must be addressed by the test kit.
The portability of a relay test kit also is a deciding factor
Here's how specific characteristics of relays affect the decision on which test kit model to purchase:
1. Type of Relay
Electromechanical Relays: These older relays have simpler operating principles. A basic test kit with fundamental current and voltage injection capabilities might suffice.
Static Relays: These require more precise measurements and additional features like phase angle adjustment.
Numerical (Digital) Relays: These modern relays require advanced test kits with capabilities to handle digital inputs/outputs, communication protocols, and complex protection schemes.
2. Protection Functions
Overcurrent Relays: The test kit must be capable of injecting high current accurately to simulate overcurrent conditions.
Differential Relays: Requires a test kit that can handle simultaneous multi-phase injections with precise synchronization.
Distance Relays: Needs a test kit that can simulate various impedance values and measure relay response to these changes.
Directional Relays: The kit should provide accurate phase angle control to test the directional sensitivity of the relay.
Frequency and Voltage Relays: The test kit must be able to vary frequency and voltage precisely.
3. Communication Protocols
IEC 61850: If the relay uses this standard, the test kit must support GOOSE messaging and other IEC 61850 communication protocols.
4. Testing Environment
Lab vs. Field Testing:
Lab Testing: Might allow for a larger, more sophisticated test kit with extensive features.
Field Testing: Requires a portable, rugged test kit that can handle environmental challenges and be easily transported.
5. Complexity of Test Sequences
Automated Testing: For relays with complex protection schemes, a test kit with robust automated testing capabilities saves time and reduces human error.
Manual Testing: For simpler relays, a kit with easy manual control might be sufficient and more cost-effective.
6. Data Analysis and Reporting
Data Logging: Advanced relays often require detailed logging and analysis of test results, necessitating a test kit with comprehensive data management capabilities.
Result Exporting: Ability to export results in various formats (e.g., CSV, PDF) is crucial for integration into larger maintenance or asset management systems.
7. Safety and Compliance
High Voltage/Current: Relays in high-power applications require test kits capable of safely handling high voltage and current injections.
Regulatory Standards: Ensure the test kit complies with relevant industry standards and certifications, which might vary based on the type of relay being tested.
8. Portability of a relay test kit
Examples of Relay Types and Corresponding Test Kit Requirements:
Differential Protection Relays (e.g., ABB RET670):
Simultaneous multi-phase injections, precise synchronization, and detailed data analysis.
Recommended Test Kit: High-end models with 6 Current Sources like the K3063i or K 3163i , KFA320 etc. known for precise and synchronized multi-phase testing.
Directional Overcurrent Relays:
Phase angle control and accurate current injection capabilities.
Recommended Test Kit: K68i , KFA310 , KFA320 etc., which balance cost and functionality.
Frequency and Voltage Relays:
Accurate frequency and voltage variation capabilities.
Recommended Test Kit: Kits like the K68i , KFA310 , KFA320 etc. which can precisely control and vary these parameters.
By understanding the specific requirements and functionalities of the relays you need to test, you can select a relay test kit that provides the necessary features, ensuring accurate and efficient testing while optimizing costs and operational efficiency.
Why Application Support is Critical for Relay Test Kits?
Relay test kits are built around highly sophisticated, high-end software platforms. These systems offer a wide range of tools and methods that allow users to simulate different fault conditions by precisely controlling phase angles, frequency, and magnitudes of multiple current and voltage sources simultaneously.
Modern relay testing software goes beyond basic functionality. It enables users to:
Import complex relay settings directly into the system
Automatically generate and visualize protection curves
Execute advanced test plans for multifunctional relays
While it is often said that an experienced protection engineer can work with any relay test kit, the reality is more nuanced. The efficiency and productivity of even the most skilled engineer can increase significantly with strong application support and proper guidance.
This becomes especially important for first-time users of automatic relay test kits. Despite all relay test kits operating on the same fundamental principles, each manufacturer implements workflows, user interfaces, and testing approaches differently. Without proper support, users may take longer to adapt, underutilize features, or even make avoidable errors.
Effective application support—particularly from the manufacturer—ensures:
Faster onboarding and reduced learning curve
Better utilization of advanced features
Higher testing accuracy and confidence
Improved overall efficiency in commissioning and maintenance activities
In practice, the real value of a relay test kit is not just in its hardware or software capabilities, but in the quality of application support and “hand-holding” that comes with it.
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