Products & Services
High-voltage testing equipment and integrated solutions for transformers, reactors, switchgear, cables, and power systems.
Turnkey Solutions
Beyond individual products, we deliver end-to-end testing solutions tailored to your site, standards, and workflow.
Material Sampling Inspection Center
Integrated sampling-inspection systems for distribution-network equipment up to 35 kV — surge arresters, instrument transformers, switchgear, reactors and arc suppression coils — with automatic measurement, switching and reporting.
Transformer Testing Laboratory
Complete lab design including power supply, test bench, instruments, shielding, grounding, and safety interlocks for transformer factories and third-party labs.
High Voltage Test Center up to 500 kV
Turnkey planning and construction of HV test halls up to 500 kV, including shielded rooms, central control rooms, rain test rooms, impulse generators, and PD-free test transformers.
Transformer Production & Logistics Line
Intelligent transformer production lines and logistics test systems, covering HV and LV test stations, automated transfer, and data management for transformer manufacturers.
Product Catalog
Browse our main product lines. Contact us for detailed specifications, datasheets, and quotations.
Transformer Testing
ECBZ-GD Energy-Efficient Transformer Energy-Grade Evaluation System
Automatic evaluation system for the energy-efficiency grade of distribution transformers up to 800 kVA at 10 kV/0.4 kV. Combines intelligent test sequence control, automatic wiring changeover, data processing, data upload and report generation in one bench.
GD-300B Transformer Short-Circuit Impedance Tester
Measures transformer short-circuit impedance, short-circuit reactance, short-circuit resistance and three-phase impedance voltage. Uses dual A/D synchronous AC sampling and DSP for winding deformation assessment in the field.
DC Winding Resistance Tester
Portable instrument for DC resistance measurement of inductive equipment such as transformers, motors and instrument transformers (CT/PT). Fully software-controlled with back-EMF protection and field anti-interference capability.
GD-400A Transformer Capacity & No-Load Loss Tester
Measures the capacity and load loss of 30 kVA to 63000 kVA power transformers on site without any external supply or auxiliary equipment. Supports waveform distortion, temperature, voltage and current correction.
GDBZ-IV Transformer Test Bench
Virtual-instrument based transformer test bench in which a PC controls the entire test sequence, covering oil-immersed transformers up to 63000 kVA / 110 kV, dry-type transformers up to 31500 kVA / 35 kV and flameproof mining transformers up to 6300 kVA / 10 kV.
GDBZ-III Transformer Comprehensive Test Bench
Comprehensive test bench for 10 kV and 35 kV class power transformers, covering no-load and load tests, induced withstand voltage and power-frequency applied withstand voltage. Primary side voltage class below 35 kV.
Transformer Intelligent Logistics Line Test System
Conveyor-based transformer test line with separate low-voltage and high-voltage stations that run simultaneously. Transformers travel along the track from insulation resistance, ratio and DC resistance testing to no-load, load, induced and power-frequency withstand testing, with all items completed on a single connection.
GDBZ-IV 220/110kV Main Transformer Comprehensive Test System
PLC-controlled transformer test system with an industrial computer operator interface for routine, selected type and special tests on 110 kV and 220 kV power transformers. Covers no-load and load loss, induced withstand voltage, temperature rise, partial discharge and no-load harmonics.
GDBZ-IV Automatic Transformer Comprehensive Test System
Human-machine terminal and integrated test device for sampling tests on distribution transformers and box-type substations rated 2500 kVA / 10 kV and below. One-key start runs ratio, DC resistance, no-load and load loss, induced withstand, insulation resistance, temperature rise and short-time overload tests.
GD700A Automatic Turns Ratio Tester
Three-phase transformer turns ratio and voltage ratio tester with a range of 0.9 to 6000. Completes a full three-phase measurement in 15 seconds, with automatic vector group testing and support for Z-connected windings.
GDRZ Transformer Winding Deformation Tester
Frequency response analysis (FRA) instrument that detects transformer winding deformation by swept-frequency measurement, using DDS digital sweep technology and dual 16-bit A/D sampling. Meets the technical conditions of DL/T911-2004.
GD-810 Transformer On-Load Tap-Changer Tester
Measures transition time, transition waveform, transition resistance and three-phase synchronism of on-load tap-changers on transformers with or without a neutral point, without lifting the core.
GD200-40WA Dual-Channel DC Winding Resistance Tester
Dual constant-current-source DC winding resistance tester with separate high-voltage and low-voltage channels, designed for temperature-rise tests on transformers up to 35kV where HV and LV winding resistances differ greatly.
GD300C Power Analyzer
Measures RMS voltage, average voltage, RMS current, active power, power factor and frequency of single- or three-phase power transformers, per JB/T 501 and GB 1094, at 0.5 accuracy class.
GD-700 Automatic Turns Ratio & Vector-Group Tester
Automatic turns-ratio and vector-group tester that completes three-phase ratio testing in one operation, identifies connection groups 0-11 and tap positions, with Z-connected transformer support.
Reactor & Arc Suppression Coil Testing
GD-300D Reactor Electrical Parameter Tester (Portable)
Portable instrument dedicated to measuring the electrical parameters of single-phase and three-phase reactors, including AC phase voltage RMS, average voltage, current RMS, active power, reactance and inductance, at 0.5 class accuracy.
GD-300D Reactor Electrical Parameter Tester (Built-in)
Panel-mounted version of the GD-300D reactor electrical parameter tester, using a 320 x 240 dot-matrix LCD with multi-screen menu operation and direct measurement of three-phase reactance, inductance and total active power.
GDDZ-III Reactor Integrated Test System
Integrated test system developed for reactor manufacturers, combining manual and computer control. Covers reactor winding resistance, terminal voltage and current, reactance, inductance, loss, applied withstand voltage and inter-turn withstand tests.
Automatic Reactor & Arc-Suppression-Coil Integrated Test System
Human-machine terminal and integrated test device for sampling tests on reactors and arc-suppression coils below 35 kV. Sequences each test item automatically and finishes with automatic report generation and data upload.
Material Sampling Test Systems
Automatic Switchgear Comprehensive Test System
Human-machine terminal and integrated test device for sampling tests on high-voltage switchgear, ring main units, pole-mounted switchgear, disconnectors, cable branch boxes and low-voltage switchgear. Runs loop resistance and mechanical characteristic tests on one-key start and performs unattended automatic temperature-rise testing.
Automatic Instrument Transformer (CT/PT) Test System
Human-machine terminal and integrated test device for sampling tests on instrument transformers rated 35 kV and below. Automatically drives the measurement, power and switching modules item by item, then generates the test report and uploads data to the data-centre platform.
Automatic Surge Arrester Comprehensive Test System
Human-machine terminal and integrated test device for sampling tests on surge arresters rated 35 kV and below. A single connection completes the power-frequency reference voltage, continuous current, DC reference voltage and 0.75 times DC leakage current tests.
GDFA-105 CT/PT Comprehensive Tester
Dedicated instrument for testing current and voltage transformers in relay protection and high-voltage insulation work. Automatically plots volt-ampere characteristics and 5% or 10% error curves, and performs ratio and polarity testing.
GDKG HV/LV Switchgear Energising Test Bench
Test bench providing various AC and DC power supplies for pre-delivery energisation tests of HV and LV switchgear, improving testing efficiency for switchgear manufacturers.
High Voltage Test Equipment
Variable-Frequency Series Resonant Test System
Compact variable-frequency series resonant test system for AC withstand testing. Displays test data and status on a green screen with real-time operating prompts, and calculates the capacitance of the test object.
YDTW Partial-Discharge-Free AC Test Transformer
Partial-discharge-free power-frequency test transformer for verifying the insulation level of insulating materials, insulation structures and electrical products, and as a PD-free power-frequency test supply for transformers, capacitors, HV switchgear, instrument transformers and surge arresters.
Automatic AC Withstand Voltage Test Set
GDNY-III automatic power-frequency withstand voltage test set, designed to the latest national industry test standards, for insulation strength tests on electrical products, components and insulating materials.
Lightning Impulse Voltage Generator
Lightning impulse test system rated 400 kV / 20 kJ for distribution transformers, HV switchgear, ring main units, pole-mounted switchgear, disconnectors, circuit breakers and instrument transformers, with automatic gap adjustment and charging.
GDJF Partial-Discharge Test System
Digital partial discharge measuring and analysing instrument with four independent channels, combining discharge measurement, fault location and online monitoring. Complies with IEC270, GB7354-2003 and DL 417-91.
Three-Phase Isolation Filter
Three-phase isolation filter rated 30 kVA at 0 to 800 V and 22 A, covering 0 to 200 Hz with attenuation of 60 dB or better from 10 kHz to 300 kHz and a partial discharge level of 3 pC or less at rated voltage. Supplied alongside the WF-100-0.001 non-partial-discharge coupling capacitor range.
Three-Phase Induction Voltage Regulator
Vertically mounted induction voltage regulator built like a wound-rotor motor, with electric and manual worm-gear drive, raise and lower direction indicators, limit switches and a stopper. Input and output terminals are brought out to a terminal board in the junction box.
GD-MF Arrester Seal-Check Heating Water Bath
Heating water bath for seal testing of surge arresters, with a digital temperature controller, 30kW heating and hot-water immersion method per the applicable standard.
Mobile Test Vehicles
Switchgear Mobile Test Vehicle
Mobile sampling-test vehicle for high-voltage switchgear, circuit breakers, disconnectors, ring main units, pole-mounted switches and cable branch boxes, plus low-voltage switchgear and JP cabinets.
Box-Type Substation Mobile Test Vehicle
Mobile sampling-test vehicle for transformers, box-type substations, reactors and arc-suppression coils, with a detachable hydraulically supported test unit for indoor transformers the vehicle cannot reach.
Intelligent Power Test Vehicle
Mobile power test vehicle for centralised testing and emergency power restoration at substations and power plants. Integrates a centrally controlled instrument cabinet, GPS tracking, video monitoring and 3G communications.
Power Testing Instruments
GD230 Ground Continuity Tester
Portable instrument for measuring the continuity resistance between the grounding down conductors of individual items of equipment in a substation. Controlled by a high-performance MCU with automatic current selection, on-board data retention and a thermal printer.
ETCR200 Clamp-on Ground Resistance Tester
Clamp-on ground resistance tester for power, telecom, meteorological and other electrical installations. Measures without auxiliary electrodes, so no disconnection of the grounding conductor and no electrode layout error.
GD-500 Automatic Capacitance & Inductance Tester
Bench instrument for measuring high-voltage shunt capacitor banks of reactive power compensation installations and for reactor measurement, without disconnecting the capacitor leads. Uses four-terminal measurement and provides on-board data storage with USB transfer.
GD6000 Frequency-Shift Dielectric Loss Tester
Fully automatic precision instrument for measuring the dielectric loss tangent and capacitance of high-voltage power equipment at power plants and substations. An internal 45 Hz / 55 Hz source gives accurate results under strong electric-field interference.
GD-210 Large Ground-Grid Resistance Tester (Type CA)
Dedicated instrument for measuring the grounding resistance of large earth grids and the continuity between grounding points. Uses variable-frequency anti-interference technology, so it needs no high-current supply and can take accurate readings even inside a strongly interfering substation environment.
GD820 HV Switch Dynamic Characteristic Tester
Tests the mechanical characteristics of oil, oil-less, SF6 and vacuum high-voltage circuit breakers, and performs timing tests on electromagnetically operated devices such as contactors and relays. 500 kV anti-interference design with 12 time channels.
GD240-100A Loop Resistance Tester
Measures the contact resistance of high-voltage switch and combined electrical apparatus contacts, and the micro-ohm values of other electrical equipment. Built to DL/T 845.1-845.4-2004 with 100A/200A current output.
HV Insulation Resistance Tester (Digital Megohmmeter)
Digital megohmmeter with 500V/1000V/2500V/5000V test voltages, insulation resistance up to 1000GΩ, PI/DAR measurement and IEC 61010-1 CAT.III 600V safety design.
Multi-Channel Data Recorder
Touchscreen multi-channel data recorder that acquires, records, displays and alarms on current, voltage and resistance signals for temperature, humidity, pressure, level, flow, composition and other physical quantities.
GD6000A Variable Frequency Dielectric Loss (Tan Delta) Tester
Variable-frequency dielectric loss (tan delta) tester that breaks through traditional bridge measurement, using frequency-conversion technology for strong anti-interference, measuring Cx and tan δ up to 10kV on transformers, CT/PT, bushings, capacitors and surge arresters.
Insulation Resistance Tester
32-bit MCU-controlled insulation resistance tester with digital and analog dual display, automatic DAR/PI/DD calculation, up to 10000V test voltage and 2000GΩ measurement range.
BY2571 Digital Ground Resistance Tester
Digital earth resistance meter using DC/AC conversion technology, measuring ground resistance, low-resistance conductor resistance, soil resistivity and earth voltage, for power, telecom, railway, communication and mining applications.
Test Center Facilities
Artificial Rain Test Room
Construction specification for an artificial rain test zone, covering clear height, waterproofing of the roof and walls, seepage drainage with a ring drainage channel, mains water supply and 6 m³/h drainage, plus an anti-static control room with suspended ceiling, lighting and air conditioning.
HV Test Center Central Control Room
Build specification for the central control room and machine room of a high-voltage test centre. Covers clear height, anti-static raised flooring with a minimum 100 mm void, reserved cable penetrations, glass curtain wall and air conditioning to a constant 20 ±5 ℃.
EMC Shielded Room for PD Testing
Modular bolted shielded enclosure built from 2 mm galvanised steel module plates with conductive gasketing, honeycomb waveguide ventilation, filtered power, dedicated grounding below 0.5 Ω and a double-glazed shielded observation window. Shielding effectiveness is 60 dB or better from 0.5 MHz to 1.6 MHz.
Services We Provide
Our service team supports you from project planning through after-sales maintenance, ensuring your test systems operate reliably for years.
- Technical consultation and test scheme design
- Equipment selection and configuration recommendation
- Factory acceptance testing and calibration
- On-site installation, commissioning, and training
- Spare parts supply and preventive maintenance
- Software upgrades and remote diagnostics
Need a Datasheet?
Send us the product name or your test requirements. We will reply with specifications, photos, videos, and a formal quotation within 24 hours.
Contact SalesSelection & Method Guides
Not sure which instrument or system covers your test list? These references compare the options and name the standard behind each test method.
CT vs PT Testers: What They Measure and How to Choose
A vendor-neutral comparison of CT and PT test programs: which parameters each family needs, how the test items differ, and when a combined CT/PT tester or a ratio-only set is the right buy.
How to Choose a Transformer Test Bench: A Selection Guide
A selection guide to transformer test benches: which test items apply to distribution and power transformers, and when a portable set, a bench or an automated line is the right fit.
Transformer Winding Deformation Testing: Methods and Standards
A short circuit, a road journey or years of load cycles all leave their mark on a transformer winding. This guide compares the main detection methods and how to interpret their results.
Insulation Resistance Testing: A Practical Field Checklist
Insulation resistance readings are easy to take and easy to misread. This checklist covers test-voltage selection, PI and DAR ratios, step-voltage and ramp tests, safety steps and preparation.
IEC / IEEE / GB Standards Cross-Reference for High-Voltage Testing
Which standard governs a high-voltage test? This reference maps transformers, CTs and PTs, partial discharge and FRA to their IEC, IEEE and GB/DL documents.
Setting Up a High-Voltage Test Laboratory: Equipment and Planning Checklist
Scope first, then measurement, then source, then building. A planning checklist for HV test halls: equipment layers, lab tiers, layout, services, commissioning and calibration.
Frequently Asked Questions
Practical guidance for selecting high-voltage test equipment. Need something specific? Contact our engineers.