​Technical Performance and Application of ZXJB Single-PhaseRelayProtection Tester

1. Introduction

Relay protection systems serve as the core safety barrier for the stable operation of modern power systems, tasked with rapidly isolating faulty components and preventing fault escalation during electrical abnormalities. Performance verification and regular calibration of relay protection devices are critical links in power grid operation and maintenance, which directly determine the reliability of protection actions. The ZXJB single-phase relay protection integrated tester is a professional test instrument developed for the on-site calibration requirements of power system relay protection devices. It is equipped with comprehensive test functions, high-precision measurement performance and user-friendly operation design, providing an efficient and reliable solution for practitioners in the power industry.

2. Product Overview

The ZXJB single-phase relay protection integrated tester adopts advanced integrated power supply technology for AC and DC voltage and current sources. This innovative design not only meets the power supply requirements for various relay test scenarios, but also provides a stable and adjustable power supply for other on-site electrical experiments, greatly simplifying on-site test configuration and improving the work efficiency of field personnel.

The instrument is optimized for on-site operation scenarios, with an exquisite and reasonable panel layout. All functional modules and operation interfaces are designed for intuitive operation, enabling operators to complete test operations quickly and accurately without complex pre-training. With its excellent comprehensive performance, the tester has been widely recognized and praised by users in the power industry.

3. Core Functional Features

The ZXJB tester covers the full test requirements of mainstream relay devices in power systems, and its core functions are as follows:

Measuring Relay Parameter Test: For current-type and voltage-type measuring relays, the instrument can accurately measure the start value, return value, and calculate the corresponding return coefficient, providing core data for evaluating the operating characteristics of the relay.

High-Precision Time Relay Test: For time relays, the tester supports the detection of start value, return value and action time, with a time measurement error of less than 0.2ms, fully meeting the high-precision verification requirements of time-limited protection devices.

Full-Parameter Intermediate Relay Calibration: For coil-type intermediate relays widely used in secondary circuits, the instrument can complete the comprehensive test of start value, return value, holding value and operation time, ensuring the reliable operation of the intermediate link of the protection circuit.

Comprehensive Reclosing Relay Test: For reclosing relays, the device supports capacitor charging performance test, charging time measurement, reclosing time verification and intermediate component action check, providing a complete test method for automatic reclosing device calibration.

Differential Relay Characteristic Verification: For differential relays, the core protection components of transformers and generators, the tester can carry out DC excitation test, braking characteristic test and volt-ampere characteristic test, effectively verifying the operating performance of differential protection under fault conditions.

Extended Test Capability: In addition to conventional relay types, the instrument also has compatible test capability for other unconventional relays, with strong adaptability to complex on-site test scenarios.

4. Key Technical Indicators

The ZXJB single-phase relay protection tester has stable electrical output performance and high measurement accuracy, with a uniform accuracy of ±0.5% for all measurement channels, which fully complies with the industry standards for power system relay protection testing. The core technical indicators are as follows:

4.1 Adjustable Output Parameters

4.2 Auxiliary Function Indicators

Fixed DC Voltage Output: The instrument is equipped with multi-channel fixed DC output, including 24V/1A, 48V/1A, 110V/1A and 220V/1A, which can provide stable auxiliary power supply for the tested device.

Digital Millisecond Meter: The built-in high-precision millisecond meter has a standard measurement range of 0~9.99999s (expandable to 99.9999s according to custom requirements), with a resolution up to 0.1ms, ensuring high-precision measurement of relay action time.

Power Supply Requirements: The instrument adopts AC220V±5%, 50Hz±5% power supply, which is fully compatible with the on-site power supply environment of conventional substations, power plants and power engineering sites.

5. Application Value in Power Industry

With the continuous expansion of the scale of modern power grids and the increasing complexity of grid structure, the requirements for the reliability of relay protection systems are getting higher and higher. The ZXJB single-phase relay protection tester, with its excellent performance, has become an essential tool for relay protection verification in the power industry, and its application value is mainly reflected in the following aspects:

5.1 Daily Operation and Maintenance of Power Grid

In the daily regular inspection of substations and power plants, the tester can complete the performance verification of various relay protection devices in the secondary circuit, timely detect the performance degradation and potential faults of the relay, and effectively avoid protection malfunction or refusal caused by device failure, which is of great significance to maintain the safe and stable operation of the power grid.

5.2 Commissioning of New Power Projects

In the commissioning stage of new power transmission and transformation projects, the instrument can realize the pre-commissioning calibration of all relay protection devices, ensuring that the protection system can operate correctly according to the set parameters when the project is put into operation, and laying a solid foundation for the safe access of new projects to the power grid.

5.3 Power Grid Fault Emergency Handling

When a power grid fault occurs, the ZXJB tester can be used for rapid verification and fault location of the protection device, helping operation and maintenance personnel to quickly find the cause of the fault, shorten the fault handling time, and accelerate the recovery of normal power supply.

5.4 Advantages for On-site Scenarios

Compared with large-scale three-phase relay protection testers, the ZXJB single-phase tester has the advantages of compact structure, portability and flexible operation, which is more suitable for on-site test scenarios with complex site conditions and limited operation space. Its integrated power supply design also eliminates the need for additional power supply equipment on site, greatly improving the convenience of on-site test work.

6. Conclusion

The ZXJB single-phase relay protection integrated tester integrates comprehensive test functions, high-precision measurement performance and user-friendly operation design, fully meeting the verification requirements of various conventional and unconventional relay devices in power systems. It provides a reliable, efficient and convenient technical solution for the operation, maintenance and commissioning of relay protection systems, and plays an important role in ensuring the safe, stable and reliable operation of modern power grids. With the continuous development of the power industry and the increasing requirements for protection device reliability, the ZXJB tester will have a broader application prospect in the power industry.

GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/