Electrical Testing Equipment & Power System Diagnostic Solutions

WESHINE provides high-performance high voltage test equipment engineered for insulation verification, dielectric withstand testing, and partial discharge diagnostics. Built to comply with international IEC/IEEE standards, our power testing equipment empowers utilities, transformer OEMs, cable manufacturers, and accredited laboratories with reliable performance across critical voltage applications.

Find Testing Solutions by Application

1. Transformer Testing Solutions

Transformer testing requires strict verification of dielectric integrity and winding performance under high electrical stress.

Key Testing Challenges:

• Detecting insulation aging and localized dielectric breakdown.
• Conducting Factory Acceptance Testing (FAT) and site commissioning.
• Evaluating partial discharge activity under induced AC voltage.
• Measuring winding resistance and turns ratio accuracy.

Recommended Testing Equipment:

➔ AC Hipot Test System

➔ Partial Discharge Test System

➔ Series Resonance Test System

➔ Transformer Turns Ratio & Resistance Testers

2. Cable Testing Solutions

Power cable systems demand accurate withstand verification and fault location to prevent unplanned grid outages.

Key Testing Challenges:

• Verifying medium and high voltage cable insulation integrity.
• Detecting outer sheath insulation degradation in buried lines.
• Locating underground cable faults quickly without line damage.

Recommended Testing Equipment:

➔ VLF AC Hipot Test Set

➔ DC Hipot Tester

➔ Cable Fault Locating System

3. Switchgear & Substation Testing Solutions

Substation commissioning relies on precise contact resistance and gas purity verification for long-term operational safety.

Key Testing Challenges:

• Verifying gas-insulated switchgear (GIS) dielectric integrity.
• Measuring circuit breaker contact resistance and timing dynamics.
• Calibrating SF6 gas density and analyzing gas purity levels.

Recommended Testing Equipment:

➔ AC/DC Combination Hipot Test Set

➔ Contact Resistance Tester

➔ SF6 Gas Quality Analyzer & Density Relay Calibrator

4. Laboratory & R&D Testing Solutions

High-voltage research laboratories require flexible voltage control and high safety margins for specialized insulation experiments.

Key Testing Challenges:

• Conducting high-voltage breakdown research on new materials.
• Testing custom insulation prototypes under controlled conditions.

Recommended Testing Equipment:

➔ Customized High Voltage Test Benches & Automated Consoles

High Voltage Testing Equipment Categories

SECTION 1: High Voltage Testing Equipment

Core High-Voltage & Ultra-High-Voltage Test Systems for Insulative Withstand & High-Sensitivity Diagnostics.

1. Hipot Test Equipment

WESHINE hipot test sets deliver controlled AC, DC, and VLF high voltage for insulation withstand testing. Engineers use these systems to verify insulation integrity in cables, transformers, and switchgear.

Key Sub-types:

• AC Hipot Test Set
• DC Hipot Test Set
• AC/DC Combination Hipot Test Set
• VLF AC Hipot Test Set

Applications: Factory dielectric testing, field maintenance, insulation breakdown verification.

2. Partial Discharge Test Equipment

WESHINE partial discharge systems detect localized insulation defects in transformers, cables, and GIS. Early detection prevents sudden insulation breakdown and catastrophic equipment failure.
Key Sub-types:
Non-PD AC Test Systems (<1 pC), Portable Multi-Channel PD Detectors, UHF/HFCT Online Monitoring.
Applications:
Transformer insulation diagnostics, GIS health monitoring, cable condition assessment. 

3. Series Resonance Test System

Series resonance systems test high-capacitance loads by tuning frequency to match circuit resonance. This technology dramatically reduces required input power during field testing.
Key Sub-types:
Variable Frequency Resonant Test Sets (20–300 Hz), Modular HV Reactors, Excitation Transformers.
Applications:
HV cable withstand testing, GIS substation commissioning, large power transformer testing.

4. Impulse Voltage Test System

Impulse voltage generators simulate lightning and switching surges on power transformers, bushings, and switchgear. These tests verify insulation margins against sudden transient overvoltages.
Key Sub-types:
Impulse Voltage Generator System, Impulse Current Generator, Digital Waveform Analysis System.
Applications:
Lightning surge withstand verification, insulation type testing.

SECTION 2: Electrical Diagnostic & Maintenance Equipment

Comprehensive Substation Maintenance, Secondary Protection, Gas/Oil Analysis & Field Measurement.

1. Transformer Test Equipment

WESHINE manufactures diagnostic instruments to measure transformer winding resistance, turns ratio, frequency response (SFRA), and dielectric dissipation factor (Tan Delta). These tools ensure full compliance during factory and field acceptance tests.
Key Sub-types:

• Transformer Turns Ratio Tester
• Transformer DC Winding Resistance Tester
• CT PT Measurement and Analysis

Applications:
Transformer FAT/SAT testing, winding diagnostics, turns ratio verification.

2. Relay Protection Tester & Switch Gear Test Equipment

Automated multi-phase injection sets and contact resistance testers verify protective relays and circuit breakers. These instruments ensure breaker mechanics and numerical protection relays operate correctly during short-circuit events.
Applications:
Protection relay calibration, circuit breaker contact resistance testing, IEC 61850 substation testing.

3. Cable Fault Locating System

Integrated cable testing systems pre-locate, trace, and pinpoint underground insulation breakdown. Field teams use these portable units to find faults quickly on distribution networks.
Key Sub-types:
Cable Fault Location System, TDR Pre-locators, Acoustic Pinpointers.
Applications:
Underground cable fault pinpointing, route tracing, cable sheath integrity testing.

4. SF6 Gas Test Equipment

Precision SF6 gas instruments measure moisture content, gas purity, and decomposition density in gas-insulated equipment. Proper testing prevents arc-quenching failures in switchgear.
Key Sub-types:
SF6 Gas Quality Analyzer, Precision Leak Detectors, Recovery Units.
Applications:
SF6 switchgear maintenance, gas purity verification, density relay calibration. 

5. Insulating Oil Test Equipment

Laboratory diagnostic tools evaluate transformer oil dielectric breakdown voltage, moisture content, and dissolved gas concentrations. Regular oil analysis extends transformer operational lifespan.
Key Sub-types:

• Dissolved Gas Chromatograph Analyzer
• Oil Trace Moisture Tester
• Oil Filtration Machine

Applications:
Transformer oil quality verification, dielectric breakdown testing, DGA analysis. 

6. Insulation & Earth Resistance Tester

High-range megohmmeters and ground testers measure substation earthing grid safety and line insulation health. Accurate grounding protects personnel during fault currents.
Key Sub-types:

• Insulation Resistance Tester
• Earth Resistance Tester
• Lightning Arrester Tester
• Insulator Tester

Applications:
Grounding grid resistance verification, surge arrester testing, PI/DAR insulation measurement.

How to Select the Right Testing & Diagnostic Equipment

Selecting proper testing hardware requires evaluating whether your task is High-Voltage Withstand Testing (Section 1) or Electrical & Diagnostic Asset Assessment (Section 2). Follow these 4 engineering steps to match your test object with the correct system configuration:

Step 1: Identify Test Object & Primary Task ➔ Determine if you need high-voltage dielectric withstand testing (Section 1) or secondary protection / diagnostic condition assessment (Section 2).

Step 2: Determine Operating Voltage & Load Characteristics ➔ Identify test voltage class and load type—capacitive (cables/GIS), inductive (transformer windings), or chemical/gas samples.

Step 3: Select Testing Method & Parameter Range ➔ Choose between power-frequency AC, DC, VLF (0.1 Hz), Partial Discharge (PD), secondary current injection, or gas/oil chromatographic analysis.

Step 4: Confirm International Standard Compliance ➔ Verify test specs against mandatory IEC, IEEE, ASTM, or local grid standards (e.g., IEC 60060, IEC 60270, IEC 60156, IEEE 400.2).

Equipment Selection Framework

Use this table to instantly determine whether your application requires a High-Voltage Test System or a Diagnostic Test Instrument.

Evaluation Category	Section 1: High Voltage Testing Equipment	Section 2: Electrical Testing & Diagnostic Equipment
Primary Engineering Objective	Insulation withstand verification, dielectric strength limits, sub-pC partial discharge detection.	Electrical parameter measurement, protection relay calibration, oil/gas chemical condition analytics.
Core Test Objects	MV/HV Cables, GIS/GIL Switchgear, Power Transformers (FAT/SAT), Insulators, Bushings.	Protection Relays, Circuit Breakers, Transformer Windings, SF6 Gas Compartments, Insulating Oil.
Typical Voltage / Signal Output	High to Ultra-High Voltage: 10kV to 1000kV+ AC/DC/VLF/Impulse.	Low-Voltage / Secondary Signals: Secondary current injection (0-100A), low-voltage DC resistance, analytical sensors.
Main Testing Technologies	Resonant tuning, High-Frequency Multipliers, Non-PD Test Transformers, Surge Impulse Generators.	Multi-phase secondary current/voltage injection, TDR/ARM fault reflection, Gas Chromatography, DGA & BDV.
Key Product Categories	• Hipot Test Sets  • Partial Discharge Systems • Series Resonance Systems  • Impulse Voltage Generators	• Transformer Test Sets  • Relay & Switch Gear Testers  • Cable Fault Locators  • SF6 Gas Analyzers  • Oil Test Equipment  • Insulation & Earth Testers
Primary Compliance Standards	IEC 60060-1, IEC 60270, IEEE 4, IEEE 400.2	IEC 60076, IEC 60255, IEC 60156, ASTM D877, IEEE C37.09

Precision & Safety Engineering

Core Engineering Commitment: WESHINE designs high voltage test systems around two non-negotiable technical pillars: uncompromised measurement precision and fail-safe operational protection. Our hardware-software integration delivers laboratory-grade accuracy while isolating operators from high-voltage hazards.

1. Measurement Precision & Output Stability

• Low Harmonic Distortion (THD < 1%)

Clean sine wave output eliminates waveform distortion, preventing false partial discharge readings and ensuring accurate dielectric breakdown diagnostics.

• High-Precision Data Acquisition

Advanced 16-bit A/D converters deliver voltage and current measurement accuracy within ±0.5% across the full operating scale.

• Ultra-Low Noise Background (<1 pC)

PD measurement circuits achieve ultra-low electrical noise thresholds, enabling early detection of microscopic insulation voids.

• Automated Phase Calibration

Digital control units automatically compensate for phase shift errors during dielectric loss (tan δ) and capacitance testing.

2. Multi-Tier Safety Architecture

• Zero-Start Interlock Protection

The system prevents high-voltage activation unless the voltage regulator sits physically at zero position, eliminating sudden voltage surge risks.

• Hardware & Software Dual Cutoff (<10 ms)

Over-voltage and over-current sensing circuits interrupt output power within less than 10 milliseconds upon insulation breakdown.

• Integrated Grounding Loop Verification

Control units automatically check grounding circuit continuity before permitting high-voltage generation.

• Noise-Immune Fiber-Optic Control

High-voltage units communicate with operator consoles via fiber-optic links, keeping personnel completely isolated from high-voltage circuits.

• Physical Emergency Interlocks

External safety door interlocks, flashing alarm towers, and dual emergency push-buttons enable immediate manual shutdown.

Precision Metrics	Safety Response Standards
Measurement Accuracy: ±0.5% Full Scale	Power Cutoff Speed: <10 ms Post-Breakdown
PD Noise Threshold: <1 pC Background	Control Isolation: 100% Fiber-Optic Link
Output Waveform: THD < 1% Pure Sine	Interlock Layers: Triple (Zero/Ground/Door)

💡 Custom Engineering Note: WESHINE configures custom safety enclosures, specialized grounding mats, and remote control consoles to match specific substation layouts or mobile testing vehicles.

Why Choose WESHINE High Voltage Electrical Diagnostic Equipment

• Accurate Output Control:Stable voltage regulation with minimal total harmonic distortion (THD) provides repeatable testing results.
• Safe Testing Operations:Multi-layer protection includes over-voltage interlocking, over-current trip settings, zero-start protection, and emergency power cutoffs.
• Tailored Engineering Solutions:WESHINE customizes voltage outputs, control console layouts, and mobile containerized test systems for specialized field conditions.
• Technical Engineering Support:Our application team provides technical consultation, operator training, and long-term service assistance for every system.
• Standards Compliance: IEC 60076 | IEC 60270 | IEC 60060 | IEEE Std 4 | CE Certified
• Factory Verification: We issue individual factory calibration reports and quality verification certificates with every equipment shipment.

Industries We Serve

• Electric Utilities & Grid Operators: Substation commissioning, routine maintenance testing, and insulation health monitoring.
• Transformer & Equipment Manufacturers: Factory Acceptance Testing (FAT), quality control, and insulation type testing.
• Cable Manufacturers: High-voltage cable withstand testing, quality verification, and factory inspection.
• Research Institutes & Universities: High-voltage research laboratories, academic testing, and dielectric breakdown studies.

High Voltage Testing Projects Worldwide

Industry / Client Sector	Deployed Testing System	Testing Application
Transformer Manufacturer (Europe)	Partial Discharge Test System	Factory Acceptance Testing & Insulation Diagnostics
Cable Manufacturer (Southeast Asia)	VLF AC Hipot Test Set	Medium Voltage Cable Factory Withstand Testing
Power Utility Substation (South America)	Variable Frequency Series Resonance System	220 kV GIS Substation Field Commissioning
High Voltage Testing Laboratory	Custom AC/DC Hipot Test Bench	Dielectric Breakdown Research & Type Testing

Frequently Asked Questions

Q: How do I choose between AC hipot testing and VLF cable testing?

A: AC hipot testing operates at 50/60 Hz grid frequencies and remains standard for transformers and switchgear. Testing long power cables at power frequencies requires excessive input power due to high capacitance. VLF testing (0.1 Hz) reduces required input power by up to 1000 times. This makes VLF the practical, portable solution for field testing MV/HV cables.

Q: Are WESHINE test reports and calibration data traceable to international standards?

A: Yes. Every equipment dispatch includes a factory calibration certificate verified against standard reference meters. Our testing procedures strictly align with IEC 60060, IEC 60270, and IEEE Std 4 protocols, allowing seamless audit acceptance by third-party inspection bodies and grid authorities.

Q: What technical parameters are required to request a custom test system quote?

A: Please provide: 1) Test object type (cable, transformer, or GIS), 2) Required maximum test voltage (kV), 3) Total capacitance or power rating of the sample, and 4) Applicable testing standards (IEC/IEEE).

Q: How do WESHINE high voltage units perform in high-humidity or extreme field environments?

A: WESHINE builds portable field instruments with ruggedized IP67 weather-resistant flight cases. For core high-voltage components, moisture-sealed insulation architecture and anti-corona shielding ensure stable dielectric strength across operating temperatures from -20°C to +55°C and relative humidity up to 95% non-condensing.

Q: Can WESHINE customize test bench layouts for specific testing rooms?

A: Yes. We design turnkey testing environments tailored to your exact laboratory footprint, target voltage parameters, power supply limits, and safety interlocking requirements.

Q: What warranty coverage and spare parts support does WESHINE provide for international clients?

A: We provide a standard 12-month full equipment warranty starting from the commissioning date. For overseas projects, WESHINE maintains an inventory of critical board-level spare parts and offers expedited global air-freight replacement along with remote video diagnostic assistance.

Q: Can testing data be exported for integration with plant Asset Performance Management (APM) systems?

A: Yes. Our digital control consoles support multi-format data export (PDF, CSV, and Word) via USB or Ethernet. Advanced multi-channel systems feature standard RS485/Modbus communication ports for direct integration into digital laboratory databases.