ZXBX-12:Portable Power Recorder for Generator Dynamic Tests

Abstract

Transient signal recording and data analysis constitute critical work in power system commissioning, especially for various dynamic tests of generators. Conventional testing instruments often suffer from single analysis functions and complicated operation procedures, which cannot satisfy comprehensive test demands for generator sets. This paper introduces the ZXBX-12 Portable Power Recording Analyzer, elaborates its functional characteristics, core testing scenarios and technical specifications, and discusses its engineering value in generator debugging.

1. Introduction

During generator commissioning, a series of mandatory dynamic tests need to be completed, including short-circuit characteristic test, no-load characteristic test, excitation system disturbance test, 10% step response test of excitation system, de-excitation time constant measurement, quasi-simultaneous synchronization equipment verification and load rejection test of generating units. These tests require synchronous multi-channel signal capture, long-time transient waveform recording, and post-test quantitative data calculation and curve analysis.

Traditional recording devices can only realize simple signal acquisition, lacking built-in professional test templates for generator working conditions, and the subsequent data processing workflow is tedious. The ZXBX-12 portable power recording analyzer is developed targeting power system application scenarios. It integrates multi-channel high-precision signal acquisition, real-time waveform display, multi-dimensional data analysis and automatic report generation, forming a complete technical solution for generator dynamic testing.

2. Core Functional Advantages

The analyzer is equipped with abundant built-in software modules to support comprehensive signal processing. Real-time drawing of test curves is supported, together with flexible curve zooming and positioning tools. Users can edit oscilloscope graphics such as embedding logos and adjusting colors, which facilitates rapid test report compilation.

Spectrum analysis and harmonic analysis modules are integrated. The harmonic analysis function supports up to the 1024th harmonic order, meeting power quality research requirements. Users can define any signal as X-axis and Y-axis to draw signal relational curves. Combined arithmetic tools support addition, subtraction, multiplication, division and integral operations of sampled signals. The equipment can automatically calculate effective values, AC power, conduct three-phase symmetry analysis, harmonic analysis, phasor diagram drawing and curve correlation comparison.

A highlight of this instrument is the embedded dedicated test templates for generators: three-phase short-circuit characteristic curve, no-load characteristic curve, excitation system disturbance test, de-excitation time constant test, frequency-voltage characteristic test, load rejection test and auto-synchronization test template. After data recording, the software automatically computes key test parameters without manual secondary calculation.

In terms of automation capability, the device can automatically generate Word and Excel formatted test reports, and complete automatic marking on test curves to realize highly automated testing work. Users are allowed to redefine the name and unit of each sampling channel. Test environment parameters and instrument configuration can be automatically saved. Meanwhile, the channel filtering function provides a simple and efficient way to optimize raw sampled signals. Channel signal types can be switched via software between DC instantaneous value and AC effective value.

3. Main Technical Specifications

The ZXBX-12 is designed with multi-channel multi-range acquisition hardware:

It provides 12 channels of low-voltage and current analog signal acquisition. Voltage input ranges cover -10 V ~ 10 V, -200 V ~ 200 V, -400 V ~ 400 V. The current measurement range is -20 mA ~ 20 mA, and one separate channel supports -100 mV ~ 100 mV analog input. Operators can switch voltage or current signal types through software.

Strict signal acquisition accuracy is guaranteed: error less than 0.5 V within -400 V ~ 400 V; error less than 0.2 V within -200 V ~ 200 V; error less than 0.01 V within -10 V ~ 10 V; current error less than 0.02 mA within -20 mA ~ 20 mA; error less than 0.2 mV within -100 mV ~ 100 mV.

It reserves 12 channels of active node switching measurement inputs applicable to DC 12–220 V switching signals, plus 3 relay output channels with maximum breaking capacity AC220 V / 1 A.

The equipment adopts split cabinet architecture. The independent operation terminal brings greater convenience for test control and remote data analysis. It carries a 12.1-inch touch screen for human-machine interaction, built-in 8 GB storage space and dual USB interfaces for data export and peripheral connection.

Different input impedances are configured for each measuring range to adapt to diversified field access conditions.

4. Engineering Application Value

In on-site generator debugging, the integrated all-in-one design greatly reduces the number of test instruments carried by engineering teams. Built-in standardized test templates effectively unify test judging criteria, lowering human error in manual calculation. Rich post-processing functions reduce offline data analysis time significantly. The automatic report function standardizes test documents, which helps power enterprises realize standardized management of generator acceptance data.

The portable structure and touch operation mode adapt well to complicated power station site environments. Multi-range wide signal coverage makes the analyzer compatible with voltage transformers, current transformers, excitation equipment and various auxiliary sensor output signals. It can be widely used in hydropower, thermal power and new energy generating unit commissioning and routine dynamic performance inspection.

5. Conclusion

With the continuous development of power grids, higher requirements are put forward for the precision and efficiency of generator dynamic testing equipment. The ZXBX-12 Portable Power Recording Analyzer integrates high-precision multi-channel acquisition, professional power-oriented analysis algorithms and automated test workflow. It effectively satisfies full-process test demands for generator characteristic experiments and excitation system tests.

As a multifunctional transient recording analysis device, it offers a reliable technical tool for power system commissioning engineers. Further optimization of sampling rate and expansion of synchronous acquisition channels will continuously improve its adaptability to large-scale unit transient stability tests in future engineering practice.

 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/