ZX-600: Technical Performance & Engineering ApplicationinIntelligentSubstations

Abstract

The merging unit (MU) is the core equipment of the process layer in intelligent substations, undertaking the tasks of signal acquisition, synchronization, and data transmission from instrument transformers. Its performance directly determines the reliability of protection, measurement and control, and metering systems in the substation. Aiming at the diversified design and construction schemes of current intelligent substations, this paper introduces the ZX-600 Merging Unit Tester, a specialized test instrument for MU performance verification. This paper elaborates on the device overview, core technical features, key technical indicators, and engineering application scenarios of the tester, demonstrating its comprehensive support for full-type MU testing and its value in ensuring the safe and stable operation of intelligent substations.

1. Introduction

With the large-scale construction and upgrading of smart grids, intelligent substations have become the core node of the power system, and the digitalization and intelligence of the process layer have put forward higher requirements for the performance verification of key equipment. Merging units, as the bridge between the primary equipment and secondary system in intelligent substations, need to adapt to different input types including electronic transformers, traditional electromagnetic transformers, and hybrid input of both. The inconsistency of design schemes in engineering projects brings challenges to MU testing, such as diversified test items, high accuracy requirements, and complex on-site test environments.

To address the above pain points, the ZX-600 Merging Unit Tester is developed as a one-stop test solution for MU full-function verification. It fully covers the test requirements of various types of merging units in practical engineering, and provides reliable technical support for the factory inspection, on-site commissioning, operation and maintenance, and fault diagnosis of merging units in intelligent substations.

2. Device Overview

The ZX-600 Merging Unit Tester is a professional test tool dedicated to merging unit performance testing. Aiming at the differences in the design and construction of current intelligent substations, the device can carry out comprehensive and effective tests on merging units with electronic transformer input, electromagnetic transformer input, and hybrid input of electronic and electromagnetic transformers. It fully meets the test requirements of merging units in various practical engineering projects, and adapts to the full life cycle management of MU equipment from factory delivery to on-site operation.

3. Core Features and Technical Advantages

3.1 Integrated High-Precision Signal Source

The tester integrates a high-precision analog signal output source with an accuracy of 0.05 level, eliminating the need for an external standard power source. This design greatly simplifies the on-site test wiring, reduces the error introduced by external equipment, and improves the portability and test accuracy of the device in field scenarios.

3.2 Simultaneous Multi-Channel Measurement and Automatic Evaluation

The device supports simultaneous real-time measurement of 6 channels of voltage and 6 channels of current signals, and can automatically generate and output standardized test evaluation conclusions. This function avoids manual judgment errors, significantly improves test efficiency, and meets the requirements of batch test scenarios in factory inspection and on-site commissioning.

3.3 Full-Type Merging Unit Compatibility

It is fully compatible with merging units of traditional electromagnetic transformer input type, electronic transformer input type, and hybrid input type, covering all mainstream MU configuration schemes in current domestic and international intelligent substation projects, and realizing the universal test capability of one device for multiple types of MU.

3.4 Full-Dimension Integrated Test Function

The tester integrates multiple test functions, supporting full-item test verification including amplitude accuracy test, harmonic characteristic test, transient error test, synchronization performance test, protocol compliance test, rated time delay measurement, paralleling and splitting logic test, and voltage withstand test. It realizes one-stop full-function test of merging units, without the need for multiple test instruments to cooperate.

3.5 Flexible Auxiliary Power Supply Adaptation

Built-in auxiliary DC output module supports free switching between 110V and 220V DC, which can adapt to the power supply environment of different voltage levels of substations, and meets the power supply requirements of on-site auxiliary equipment.

3.6 Dual Independent Operation Modes

The built-in industrial personal computer (IPC) supports independent offline stand-alone operation, and can also be connected to an external PC for operation with a unified set of operating software. This dual mode design meets the needs of both portable on-site testing and systematic batch testing in the laboratory.

3.7 Reliable Hardware Protection and Thermal Design

With optimized heat dissipation structure design and complete hardware protection mechanism, the device is equipped with over-current, over-temperature, and short-circuit protection and real-time alarm functions. It can maintain long-term stable and safe operation in complex on-site environments with harsh temperature and electromagnetic interference, ensuring the reliability of long-time continuous tests.

4. Key Technical Specifications

The ZX-600 Merging Unit Tester has industry-leading technical indicators, which provide a solid guarantee for the accuracy and reliability of test results. The core technical indicators are as follows:

4.1 Analog Signal Output Performance

4.2 Communication and Interface Performance

Optical Ethernet interface: 6 pairs×100Mbits/s, SC interface, multi-mode 1310nm; supports IEC61850-9-1/2/LE, Goose, IEEE-1588 protocols; sending dispersion <0.1μs, receiving time accuracy <25ns, IEEE-1588 time synchronization accuracy <80ns, max output flow >95M.

Optical serial interface: 5 pairs×(2~10Mbits/s, SC, multi-mode 850nm); supports IEC60044-7/8, FT3 protocols, Manchester code or asynchronous serial port transmission mode; sending dispersion <0.1μs, receiving time accuracy <25ns.

Synchronous interface: Built-in GPS module, 1 pair×IRIG-B/PPS optical port (SC, multi-mode 850nm), synchronization accuracy <1μs.

Electrical Ethernet interface: 1×RJ-45 100Mbits/s interface.

Switch input: 8 channels, 10-250VDC or idle contact, auto-identifying, no polarity.

Switch output: 8 channels, idle contact/fast output, AC/DC breaking capacity 0.5A/250V, fast output time <10μs.

4.3 Physical and Power Supply Parameters

Display: 8.4-inch screen with 1024×768 resolution

Power supply: AC 220V±15%, frequency 50Hz±10Hz

Dimension: 360 × 200 × 415 mm

Weight: 16.8Kg

5. Engineering Application Scenarios

The ZX-600 Merging Unit Tester has a wide range of application scenarios in the power industry, covering the full life cycle of merging unit equipment:

Factory Inspection for MU Manufacturers: It is used for type test, delivery inspection and performance calibration of merging units, to ensure that the equipment meets the design and standard requirements before delivery.

On-site Commissioning of New Substation Projects: It is used for on-site performance verification and function debugging of merging units in the construction of new intelligent substations, to ensure the correct access and stable operation of the equipment.

Operation and Maintenance of Operating Substations: It is used for regular inspection, performance evaluation and fault diagnosis of merging units in operating substations, to find potential risks in time and ensure the safe operation of the power grid.

Scientific Research and Standard Verification: It can be used by power research institutes and colleges for MU performance research, protocol compliance verification, and new technology test verification, providing a reliable test platform for technological innovation in the power industry.

6. Conclusion

The ZX-600 Merging Unit Tester, with its high-precision signal output, full-type MU compatibility, full-dimension test functions, and high-reliability hardware design, effectively solves the pain points of merging unit testing in current intelligent substation projects. It provides a comprehensive, efficient and reliable test solution for the performance verification of merging units, and is an important core tool for the construction, operation and maintenance of intelligent substations. With the continuous development of smart grid technology, the tester will play a greater role in ensuring the safe, stable and reliable operation of the power system.

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/