ZXBP Series Electronic Multi-FrequencyGeneratorforTransformer InsulationTesting

Abstract

The induction voltage withstand test is a critical quality validation procedure for power transformers and inductors in the power industry, which directly determines the reliability of the longitudinal insulation performance of winding structures. This paper introduces the ZXBP Series Electronic Multi-Frequency Generator, a specialized test instrument developed for transformer longitudinal insulation assessment, covering its design logic, core technical features, standardized specifications, and application values in power system testing. Verified by extensive field applications, this series provides a high-efficiency, reliable, and portable solution for both factory and on-site insulation tests of power equipment.

Introduction

Power transformers are the core equipment in power transmission and distribution systems, and the insulation performance of their windings directly affects the safe and stable operation of the entire power grid. Among all insulation test items, the assessment of turn-to-turn, inter-layer, inter-section, and inter-phase insulation of transformer windings (namely the longitudinal insulation test) is an indispensable link in the full life cycle management of power equipment.

The longitudinal insulation test relies on a frequency-doubling power supply to apply the required test voltage, which can effectively avoid core saturation and excessive excitation current caused by power frequency voltage input. Traditional frequency-doubling test equipment has obvious limitations, such as large volume and weight, single frequency output, complex operation, and high demand for on-site power capacity. To address these industry pain points, the ZXBP Series Electronic Multi-Frequency Generator is developed to provide an optimized technical solution for transformer insulation testing.

Product Overview

The ZXBP Series Electronic Multi-Frequency Generator is a professional power electronic test device specially designed to meet the requirements of induction voltage withstand tests for transformers, reactors, and other inductive power equipment. This series adopts an advanced power electronic conversion topology, which breaks through the technical bottlenecks of traditional motor-generator frequency conversion equipment. It has been fully verified by a large number of users in the power industry, and has been widely used in routine factory tests, on-site handover tests, and preventive tests of power transformers, providing reliable technical support for the quality control and operation maintenance of power equipment.

Core Technical Features

1.Compact Design with High Power DensityCompared with traditional frequency conversion test equipment, the ZXBP series has significant advantages of small size, light weight, and excellent portability, while supporting a maximum output capacity of up to 20kVA. This design perfectly balances portability and high power output capability, making it suitable for both fixed laboratory test scenarios and complex on-site test environments in substations.

2.Flexible Multi-Gear Frequency OutputUnlike traditional devices that can only output third-harmonic (150Hz) voltage, the ZXBP series provides selectable output frequencies of 50Hz (1×), 100Hz (2×), 150Hz (3×), and 200Hz (4×). This multi-frequency output capability can meet the test requirements of different types and voltage levels of transformers in accordance with national and international standards, achieving full coverage of various longitudinal insulation test scenarios.

3.User-Friendly Design with Low On-Site Power DemandThe series features a simplified wiring structure and intuitive operation process, which greatly reduces the operation threshold for test personnel. Meanwhile, through optimized power electronic topology design, the device significantly lowers the capacity requirement for the on-site input power supply, simplifying the preparation work for on-site tests and greatly improving test efficiency.

4.Standardized Technical Specifications

The key technical indicators of the ZXBP Series Electronic Multi-Frequency Generator are as follows:

A.Rated Output Capacity: 0 to 20kVA

B.Input Power Supply: AC 380V ±10%, three-phase, 50Hz power frequency; compatible with single-phase 220V input (connected to the A and C terminals of the power input port, with the output capacity reduced by approximately half)

C.Output Voltage Range: 0 to 400V (can be boosted by matching an external step-up transformer, with customized configurations available for different voltage requirements)

D.Selectable Output Frequencies: 50Hz, 100Hz, 150Hz, 200Hz

E.Total Harmonic Distortion (THD) of Output Voltage: <3%

Application Advantages in the Power Industry

In the full life cycle management of power transformers, the ZXBP series shows outstanding application advantages in multiple core scenarios. In the factory routine test stage, the device can output high-precision frequency-doubling test voltage with ultra-low harmonic distortion, which can accurately detect potential longitudinal insulation defects in transformer windings, ensuring that delivered products fully meet quality standards.

In the on-site handover and preventive test stage, its excellent portability enables it to adapt to the complex environment of outdoor substations, and the low input capacity requirement makes it compatible with the limited power supply conditions on site, greatly improving the flexibility of on-site tests. In addition, the <3% THD of the output voltage ensures the high quality of the test voltage waveform, which guarantees the accuracy and reliability of test results, avoiding misjudgment of insulation status caused by waveform distortion.

Conclusion

The ZXBP Series Electronic Multi-Frequency Generator effectively solves the inherent limitations of traditional transformer induction voltage test equipment, with its high power density, flexible multi-frequency output, user-friendly operation, and high-precision output performance. It is an ideal and reliable solution for the longitudinal insulation test of power transformers, reactors and other inductive power equipment, and provides strong technical support for the quality control of power equipment and the safe and stable 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/