Technical Performance & Engineering Application of ZX-BZL TR L&NLL Tester

Abstract

Power transformers are core equipment in power transmission and distribution systems, and their no-load and load loss characteristics are critical parameters for evaluating equipment energy efficiency, insulation health, short-circuit withstand capability, and operational reliability. Traditional pointer-type measuring instruments have obvious limitations in test accuracy, functional integration, and on-site adaptability, which can no longer meet the high-precision, intelligent test requirements of modern power systems. This paper systematically introduces the technical principle, core functions, key specifications, and engineering application scenarios of the ZX-BZL Transformer Load & No-Load Loss Tester, providing a professional reference for power engineering technicians engaged in transformer testing, operation and maintenance, and type testing.

1. Core Measurement Capability of the Instrument

The ZX-BZL tester is a professional intelligent measuring device developed for transformer no-load and load characteristic tests. It can simultaneously measure the AC voltage effective value, average voltage, current effective value, active power, power factor, and frequency of single-phase and three-phase power transformers, with a core power parameter measurement accuracy of class 0.1. This high-precision measurement capability ensures that the instrument can accurately capture the subtle changes in transformer loss characteristics, providing reliable data support for transformer performance evaluation and fault diagnosis.

In addition to basic electrical parameter measurement, the instrument can directly complete the test of transformer load current, load loss, short-circuit voltage, and short-circuit (load) loss, covering all core test items of transformer no-load test, load test, and induction withstand test specified in IEC 60076 and GB/T 1094 series standards, and is an ideal alternative to traditional pointer-type test instruments.

2. Key Technical Features and Intelligent Design

2.1 High-precision Harmonic Analysis Capability

Affected by the grid connection of new energy sources and non-linear loads, harmonic content in the power grid has an increasingly significant impact on transformer additional loss and operating temperature rise. The ZX-BZL tester supports harmonic analysis up to the 31st order, which can quantitatively evaluate the influence of harmonic components on transformer loss, helping technicians to analyze the operating state of transformers in complex grid environments and formulate targeted harmonic suppression and loss reduction strategies.

2.2 Diversified Test Methods and Intelligent Wiring Verification

The instrument supports three test methods including the two-wattmeter method and two experimental methods, which can adapt to different test standards, wiring methods, and on-site test conditions, meeting the test requirements of different voltage levels and capacity types of transformers.

For three-phase transformer no-load and load tests, the instrument has an automatic wiring correctness judgment function, and can display the three-phase voltage and current vector map in real time. This design effectively avoids test errors and even equipment damage caused by on-site wiring errors, reduces the professional threshold for on-site operators, and significantly improves the safety and efficiency of field tests.

2.3 Wide Capacity Adaptation and Automatic Parameter Correction

In the on-site test scenario, it is often impossible to provide the rated large current required for the full load test of large-capacity transformers due to the limitation of the on-site power supply capacity. The ZX-BZL tester can complete the full load current test of distribution transformers below 1000kVA with a single machine, and complete the load test of distribution transformers below 2500kVA under 1/3 of the rated current. It can automatically convert the measured data to the load loss parameters under the rated current, solving the pain point of on-site large-capacity transformer test under the condition of limited power supply capacity.

At the same time, the instrument is equipped with a full-process automatic correction function, which can automatically complete waveform correction, temperature correction, non-rated voltage correction, non-rated current correction and other calibration operations. This function eliminates the error caused by manual calculation and correction of traditional instruments, ensures the accuracy and consistency of test results under different test conditions, and meets the requirements of precision measurement in transformer type tests and preventive tests.

2.4 Human-Computer Interaction and Full-Lifecycle Data Management

The instrument is equipped with a 320×240 high-brightness LCD display with adjustable brightness, which can adapt to the test environment in different seasons and lighting conditions. The touch button design and friendly man-machine dialogue interface greatly simplify the operation process and reduce the difficulty of on-site operation.

In terms of data management, the instrument supports presetting 40 groups of test product parameters, which can be added or deleted according to the test requirements, avoiding repeated parameter input for batch tests. The built-in real-time clock can automatically record the test date and time, and support the storage of 500 groups of test results with power-down protection, which can realize on-site rapid printing of test results through the panel-type thermal printer, and also can complete data transmission with the upper computer, which is convenient for the traceability, archiving and statistical analysis of test data in the whole lifecycle of the transformer.

2.5 Scalable Measurement Range

To meet the test requirements of large-capacity power transformers, the instrument allows the connection of external voltage transformers and current transformers to expand the measurement range, realizing the accurate measurement of any measurable parameters of the test product, and greatly improving the application scope and scene adaptability of the equipment.

3. Key Technical Specifications

The main technical parameters of the ZX-BZL Transformer Load & No-Load Loss Tester are shown as follows, which meet the accuracy requirements of mainstream international and domestic power test standards:

Current measurement range: 100mA ~ 60A, accuracy class 0.2;

Voltage measurement range: 10V ~ 650V, accuracy class 0.2;

Frequency measurement range: 40Hz ~ 65Hz, accuracy class 0.2;

Power supply: AC220V ± 10%;

Core power parameter measurement accuracy: class 0.1;

Measurement range expansion: supported by external voltage and current transformers.

4. Typical Engineering Application Scenarios

4.1 Transformer Factory Test and Type Test

In transformer manufacturing enterprises, the instrument can be used for routine factory tests and type tests of transformers, to verify whether the no-load loss, load loss, short-circuit voltage and other parameters of the product meet the design requirements and relevant standard specifications, and provide a reliable basis for product delivery and quality control.

4.2 On-site Handover Test of Power Grid

For newly installed transformers in power transmission and distribution projects, the instrument can complete the handover test before commissioning, accurately evaluate the equipment state after transportation and installation, and ensure that the transformer meets the commissioning conditions.

4.3 Preventive Test and Condition-Based Maintenance

In the operation and maintenance of the power grid, the instrument is used for regular preventive tests of operating transformers. By monitoring the change trend of no-load and load loss characteristics, it can effectively identify potential faults such as transformer core insulation damage, winding deformation, and inter-turn short circuit, provide data support for condition-based maintenance of transformers, and avoid unplanned outage accidents caused by equipment faults.

4.4 Transformer Energy Efficiency Evaluation and Energy Saving Renovation

Under the dual-carbon goal, the power industry has put forward higher requirements for the energy efficiency of distribution transformers. The high-precision measurement capability of the ZX-BZL tester can accurately evaluate the energy efficiency grade of in-service transformers, provide a quantitative basis for the elimination and renovation of high-energy-consuming transformers, and help the power grid to reduce loss and improve efficiency.

5. Conclusion

The ZX-BZL Transformer Load & No-Load Loss Tester integrates high-precision measurement, intelligent analysis, diversified test methods and full lifecycle data management functions, which solves the limitations of traditional test instruments. Its class 0.1 core measurement accuracy, 31st order harmonic analysis capability, wide capacity adaptation range and rich intelligent functions fully meet the professional test requirements of power transformers in the whole lifecycle from factory manufacturing, on-site commissioning to operation and maintenance.

For power engineering technicians engaged in transformer testing, operation and maintenance, and quality inspection, this instrument can significantly improve test efficiency and data accuracy, reduce the risk of on-site operation, and is a reliable professional tool to ensure the safe, stable and economic operation of power transformers and power systems.

 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/