ZXBP Series Multi-Frequency Generator for Power Insulation Testing

The ZXBP series electronic multi-frequency generator is a specialized testing device designed for inductive withstand voltage tests on transformers and instrument transformers. By generating adjustable high-frequency outputs (1× to 4× the fundamental frequency), it addresses the critical need for longitudinal insulation testing of windings, including inter-turn, inter-layer, and inter-phase insulation. This article details its technical features, specifications, and applications in power industry testing scenarios.

1. Introduction

Longitudinal insulation testing is a mandatory procedure for transformers and instrument transformers to ensure compliance with national safety standards. Traditional methods rely on bulky frequency-multiplying transformers or complex cascaded power supplies, which are inefficient and limited in flexibility. The ZXBP series overcomes these challenges by integrating advanced power electronics to deliver compact, lightweight, and highly configurable multi-frequency outputs.

2. Key Technical Features

2.1 Compact Design & High Power Density

With a modular structure and optimized power topology, the ZXBP achieves a power capacity of up to 20 kVA while maintaining a portable form factor. This enables on-site testing in confined spaces, reducing logistical challenges for field technicians.

2.2 Multi-Frequency Output Flexibility

The device supports four frequency modes:

1.50 Hz: Standard power frequency testing.

2.100 Hz: Double-frequency for accelerated aging tests.

3.150 Hz: Triple-frequency (industry-standard for transformer longitudinal insulation tests).

3.200 Hz: Quadruple-frequency for specialized high-voltage stress evaluations.

2.3 Wide Input Voltage Compatibility

Three-phase 380 V ±10%: Standard industrial supply for full-capacity operation.

Single-phase 220 V: Enables operation in low-infrastructure environments (note: reduces output capacity by ~50%).

2.4 High-Fidelity Waveform

A proprietary PWM control algorithm ensures output voltage distortion <3%, critical for avoiding false test results caused by harmonic interference.

3. Technical Specifications

4. Application Scenarios

4.1 Transformer Longitudinal Insulation Testing

The ZXBP generates 150 Hz output to induce a voltage of 2× rated voltage + 1 kV across transformer windings, per IEC 60076-3 requirements.

4.2 Instrument Transformer Compliance Testing

Used for frequency-multiplied dielectric tests on voltage transformers (VTs) and current transformers (CTs) to validate insulation integrity under high-frequency stress.

4.3 Grid Asset Maintenance

Supports routine insulation diagnostics for aging power equipment in substations, ensuring early detection of inter-turn faults.

5. Advantages Over Conventional Solutions

1.Portability: 60% weight reduction compared to iron-core frequency multipliers.

2.Efficiency: Direct electronic frequency multiplication eliminates energy losses in magnetic circuits.

3.Adaptability: User-selectable frequencies eliminate the need for multiple test setups.

The ZXBP series represents a paradigm shift in insulation testing technology, combining power electronics innovation with practical field requirements. Its ability to deliver clean, multi-frequency outputs in a compact package makes it indispensable for utilities, manufacturers, and testing laboratories aiming to streamline compliance workflows while enhancing test accuracy. Future iterations are expected to integrate IoT-enabled monitoring for automated test reporting.

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/