ZX-BC : : A High-Precision Tool for Power Transformer Testing

Technical Article

1. Introduction

Transformer turns ratio testing is a critical routine inspection in power system operation and maintenance, which directly verifies the correctness of transformer winding turns, connection groups, and winding faults. The ZX-BC Automatic Transformer Turns Ratio Tester is an innovative, portable, and high-precision testing instrument developed for power engineering technicians, designed to meet the demands of on-site and laboratory testing for transformers, potential transformers (PT), and current transformers (CT).

2. Core Product Overview

The ZX-BC tester features a compact, lightweight design (3.8 kg, dimensions 325×225×125 mm), making it highly portable for on-site power substation maintenance. It integrates advanced testing algorithms to deliver fast, accurate measurements for transformer turns ratio, connection group, and polarity testing, with a focus on reliability and ease of use for field technicians.

3. Key Technical Features

3.1 Flexible Power Supply & High Mobility

The instrument supports dual power supply modes: built-in lithium battery or 100-240V AC adaptive input. A full charge enables continuous testing of over 100 transformers, eliminating the need for on-site power access and significantly improving work efficiency in outdoor or remote substation environments.

3.2 Blind Measurement Function

A standout feature is its blind measurement capability, which allows variable ratio and connection group testing without requiring a connection between high-voltage and low-voltage windings. This is particularly valuable for testing transformers with inaccessible windings or in scenarios where direct interconnection is impractical, expanding the instrument's application scope.

3.3 Wide Compatibility & Expanded Testing Scope

Beyond conventional transformers, the ZX-BC supports testing for Z-type transformers, PT samples, and adds CT variable ratio polarity testing functionality. This multi-function design makes it a one-stop solution for power testing teams, reducing the need for multiple specialized instruments.

3.4 Ultra-Wide Range & High Accuracy

The tester achieves an industry-leading variable ratio measurement range of 0.9 ~ 10,000, with guaranteed accuracy of 0.3% even at the maximum range of 10,000. The tiered accuracy specification ensures reliable performance across all testing scenarios:

≤500: ±(Reading×0.1% + 2 words)

500~3000: ±(Reading×0.2% + 2 words)

3000: ±(Reading×0.3% + 2 words)

3.5 Comprehensive Protection & Industrial-Grade Design

Equipped with reverse connection protection and output short-circuit protection, the instrument prevents damage from operator errors during on-site wiring. Its 6-inch high-brightness industrial LCD screen ensures clear visibility under strong sunlight, a critical requirement for outdoor testing. Additionally, the built-in printer and local/USB data storage functions enable instant on-site report generation and data archiving.

4. Technical Specifications

5. Application Scenarios

The ZX-BC Automatic Transformer Turns Ratio Tester is widely used in:

Routine maintenance and preventive testing of power transformers in substations

Factory acceptance testing for newly manufactured transformers, PTs, and CTs

Fault diagnosis and winding integrity verification for transformers after transportation or overhaul

On-site testing for distribution transformers in power distribution networks

6. Conclusion

For power system technicians, the ZX-BC tester combines portability, high precision, and multi-functionality, addressing the core pain points of on-site transformer testing. Its advanced features, such as blind measurement, wide-range accuracy, and industrial-grade reliability, make it an essential tool for improving testing efficiency and ensuring the safe operation of power transformers in power grids.

 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/