High-Voltage Electrical Testing Equipment for Power Grids & Manufacturers
Nanjing Gaodian Electric Power Equipment plans, builds and equips high-voltage test centers up to 500 kV — covering material sampling inspection systems for arresters, instrument transformers and switchgear, transformer test systems and production lines.
Product Categories
Engineered for transformer factories, power utilities, and testing laboratories. Each product line supports IEC, IEEE, and GB standards.
Transformer Testing Systems
Comprehensive transformer test solutions covering ratio, winding resistance, load/no-load loss, and impulse voltage tests.
Reactor & Arc Suppression Coil
Dedicated reactor and Petersen coil detection systems for inductance, withstand voltage, and loss measurement.
Material Sampling Test Systems
Integrated sampling-inspection systems for surge arresters, instrument transformers and switchgear up to 35 kV, with automatic measurement and wiring guidance.
High Voltage Test Equipment
AC/DC withstand voltage testers, impulse generators, partial-discharge-free test transformers, and series resonant test sets.
Mobile Test Vehicles
Custom-built test vehicles for on-site transformer, switchgear, and box-type substation testing.
Power Testing Instruments
Portable instruments for insulation resistance, loop resistance, transformer ratio, dielectric loss, and transformer electrical parameters.
Test Center Facilities
Shielded rooms, central control rooms and artificial rain test rooms — the core infrastructure of a compliant high-voltage test hall.
Turnkey Test Labs
Planning, supply, installation, and commissioning of 500 kV and below high-voltage test centers, including transformer production lines.
Popular Products
Our most-requested high-voltage testing instruments and systems, trusted by utilities and transformer manufacturers.
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.
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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.
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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.
View DetailsGDDZ-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.
View DetailsAutomatic 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.
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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.
View DetailsLightning 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.
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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.
View DetailsIntelligent 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.
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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.
View DetailsHV 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.
View DetailsEMC 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.
View DetailsApplication Scenarios
From factory acceptance tests to on-site commissioning, our equipment is used across the full lifecycle of power transformers, reactors, switchgear, and cables.
- Transformer factory outgoing inspection
- Substation acceptance & preventive testing
- Power utility maintenance departments
- Electrical equipment import/export inspection
- Research institutes & third-party labs
- Railway, metro & industrial power systems
Why Choose Nanjing Gaodian Electric Power Equipment
We combine deep engineering experience with responsive customer support to deliver reliable testing solutions.
ISO 9001 Certified
Strict quality management system from design to after-sales.
High Voltage Expertise
Focused on HV test equipment with professional R&D team.
Global Delivery
Equipment exported to Asia, Africa, Middle East, and South America.
On-Site Service
Installation, commissioning, training, and maintenance support.
Technical Guides & Selection References
Method and selection guides written by our application engineers: what each test detects, which standard defines it, and how to choose between the equipment families that solve the same problem.
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.
Frequently Asked Questions
The questions buyers ask us most often before requesting a quotation.
What does Gaodian Electric manufacture?
What voltage class of equipment can you supply?
Do you deliver a complete test laboratory or only individual instruments?
How is the equipment configured for standards in my market?
How do I get a quotation?
Need a Custom Transformer Testing Solution?
Tell us your voltage level, test items, and standards. Our engineers will recommend the right system and prepare a detailed quotation.