KRT Relay Test Software: Overcurrent Protection Test

Module Overview

The Overcurrent Protection Test module is a core component of KRT, specifically designed for verifying and debugging various overcurrent protection functions (50/51/67/67N, etc.) in power systems. It provides comprehensive, flexible, and intuitive testing solutions, suitable for scenarios such as protection relay device R&D, factory acceptance testing, on-site commissioning of substation protection relay devices, and periodic maintenance.

Core Function Highlights

1. Comprehensive Testing Capabilities

• Supports phase-to-ground overcurrent, phase-to-phase overcurrent, and sequence component overcurrent (positive-sequence I₁, negative-sequence I₂, zero-sequence I₀) testing.

• Compatible with both definite-time and inverse-time characteristic curves.

• Configurable directional (67/67N) or non-directional (50/51) overcurrent protection elements.

• Adaptable to various fault types (single-phase-to-ground, phase-to-phase short circuits, etc.).

• Allows simultaneous addition of multiple overcurrent test objects, with each supporting multiple overcurrent modules, and each module featuring different overcurrent elements.

  
  

2. The software supports pre-configured protection device templates and allows importing XRIO configuration files from protection devices to quickly obtain their configured overcurrent protection settings.

3. Precision Parameter Configuration

• Enables independent configuration of corresponding overcurrent settings, time constants and inverse-time curve parameters based on different fault types (phase-to-ground, phase-to-phase, sequence components)

• Ensures test conditions accurately match actual protection requirements

4. Intuitive Error Visualization

• Configurable current value tolerance range and time value tolerance range

• Displays total time error range (shaded area) on characteristic curve plot, provides immediate visual confirmation of whether test results meet specifications

  
  

5.Multi-section Curve Fitting Test

• Supports simultaneous configuration of multiple overcurrent characteristic curves (e.g., Section I definite-time, Section II inverse-time).

• The software automatically synthesizes a complete, continuous overcurrent characteristic curve based on configured pickup values and time parameters for testing, accurately simulating real protection logic. This significantly simplifies testing procedures for multi-section coordinated protection.

6.Flexible Test Scheme Management
Allows creation of multiple overcurrent characteristic curve schemes. Users can selectively enable or disable any curve scheme for testing, facilitating scenario-specific verification or batch testing.

7.Intelligent Result Evaluation
The software automatically analyzes each test result against pre-set characteristic curves and tolerance ranges, providing immediate and unambiguous "Passed" or "Failed" conclusions. This greatly enhances testing efficiency and objectivity.

8.Professional Report Generation
Generates professional test reports (RTF/PDF formats) with one click. Reports are automatically categorized and saved by fault type (e.g., "Phase-to-Phase Overcurrent Test Report", "Phase-to-Ground Overcurrent Test Report"), with clear presentation of results for easy reference and archiving.

9.Highly Customizable Reports

• Supports company logo embedding to enhance professionalism and brand identity.

• Offers report format options:

- Long Format: Includes detailed overcurrent characteristic curves visually comparing test points with theoretical curves and error ranges

- Summary Report: Provides consolidated "Passed/Failed" evaluation conclusions for all test items

Efficient Testing Workflow

1. Module Initialization
Launch KRT software and select the "Overcurrent Protection Test" module.

2. Protection Element Configuration

• Select test objects: IN (phase-to-ground), IL (phase-to-phase), I1 (positive-sequence), I2 (negative-sequence), I0 (zero-sequence)

• Configure characteristic curves: Set definite-time or inverse-time parameters, directionality (directional/non-directional)
  (Multiple elements and curves can be added)

  
  

3.Test Execution & Reporting

• Add test points (current values, time/characteristic points)

• Execute test and obtain real-time results with automatic evaluation

• Generate and export customized professional test reports