STA Advanced Series

Partial Discharge Measurement System
for Motors and Stators

According to IEC 60034-18-41, IEC/TS 61934 and IEC/TS 60034-27-5

A modular system for reliable partial discharge testing in production and lab environments

The Solfas STA Advanced Series is a modular system for reliable partial discharge testing in production and laboratory environments. It integrates high-voltage generation, PD detection, voltage measurement, and an automated switching matrix for multiple winding configurations.

Its software enables configurable test sequences with controlled voltage ramp-up and precise PDIV measurement, while automatically generating standardized reports for consistent and traceable results.

STA System Overview – Modular Concept

Base System

Partial Discharge Measurement – GTU860

The integrated GTU860 is a compact and versatile partial discharge measuring device for routine and laboratory testing. Its highly sensitive UHF PD detection and strong low-frequency interference suppression enable reliable measurements with various test voltage waveforms and ensure precise, reproducible test results.

High Voltage Switch Matrix

The switch matrix enables automatic switching between different voltage sources and DUT connections for various tests. Several test steps can be performed automatically, eliminating the need for manual reconfiguration of the test setup. This greatly improves comfort, safety and testing speed.

Safety System

The system features essential safety functions for high-voltage testing, including emergency stop, start and stop buttons, red/green warning lights, and a safety interlock loop for integration into external safety systems. Additional safety features are available as optional extras.

STA High Voltage Sources

Flexible Voltage Sources for Every Partial Discharge Testing Requirement

Sinus

Sinusoidial high voltage

  • For PD tests
  • For HVAC tests
  • Up to 5kV

Surge Pulse

Surge voltage from capacitor discharge

  • For PD tests
  • For Surge voltage tests
  • Up to 6kV

Rectangular Pulse

High voltage inverter voltage (PWM)

  • For PD tests
  • unipolar or bipolar
  • Up to ±2.5 kV

4 STA Advanced Models with Different Voltage Sources

Choose the right configuration for your application — from compact routine testing to advanced high-voltage and partial discharge measurements.

STA Sinus

  • GTU860
  • Safety System
  • Switch Matrix
  • Sinus Source 

STA Surge

  • GTU860
  • Safety System
  • Switch Matrix
  • Surge Source 

STA Sinus / Surge

  • GTU860
  • Safety System
  • Switch Matrix
  • Sinus Source
  • Surge Source

STA Sinus / Pulse

  • GTU860
  • Safety System
  • Switch Matrix
  • Sinus Source
  • Pulse Source

STA Advanced Upgrades & Extensions

Expand the STA system with additional measurement functions, automation features, safety options, and customized integrations for specific testing requirements.

Enviromental
measurement ECM

Measures temperature, humidity and air pressure for the test report.

WHY YOU NEED THIS

When you must prove the abient was within limits for a valid PD result.

Winding resistance measurement WRM

Measures winding resistance for full electrical stator qualification.

WHY YOU NEED THIS

When you need resitance values in the report.

Impedance
measurement LCR

Measures inductance, capacitance and resistance for full electrical stator qualification.

WHY YOU NEED THIS

When you need inductance, capacitance and resistance values in the report.

Switch matrix
upgrade GSX6

Upgrade from 3 to 6 connection terminals for stator winding.

WHY YOU NEED THIS

When re-wiring between PD steps is not an option on your line.

Advanced safety
SCU05

For enhaced safety when connecting external safety guards like test cabins and e-stop buttons.

WHY YOU NEED THIS

This ensures safe high voltage disconnection when safety guards are open.

Advanced voltage measurement AVM

Scope-style voltage + PD on screen; export curves and key figures to reports.

WHY YOU NEED THIS

When you need detailed waveforms and voltage measurements

Technical Background: Why PD Measurements Matter

Partial discharge measurement allows a more precise evaluation of insulation quality than conventional methods. Measuring PDIV and PDEV shows the voltage levels where PD activity starts and stops, providing measurable insulation quality indicators while controlled PD levels help prevent insulation damage during testing.

Measurable Insulation Quality – How It Works

PDIV & PDEV

PDIV defines the voltage at which partial discharge activity starts during increasing voltage, while PDEV defines the voltage at which the activity stops again during decreasing voltage.

RPDIV & RPDEV

RPDIV defines the voltage at which repetitive partial discharge activity starts during increasing voltage, while RPDEV defines the voltage at which the repetitive activity stops again during decreasing voltage.

STA Systems Support the Following Standards

IEC/TS 60034-27-5

Off-line partial discharge tests on winding insulation of rotating electrical machine during repetitive impulse voltage excitation.

IEC/TS 61934

Electrical insulating materials and systems – Electrical measurement of partial discharges (PD) under short rise time and repetitive voltage impulses.

IEC 60034-18-41

Partial discharge free electrical insulation systems (Type I) used in rotating electrical machines fed from voltage converters – Qualification and quality control tests.

Software & Automation

for Advanced High Voltage Central control, test-plan execution, and reporting in one workflow.

Test Plans

  • Flexible product-specific test sequences
  • Automatic or manual execution
  • Switch-matrix routing integrated

Measurement Functions

  • Step-by-step voltage increase for PD detection
  • PD count and amplitude visualization
  • Synchronized source, matrix, and PD unit control

Data & Reporting

  • Automatic PDF test report generation
  • Database export and network integration
  • Role-based access and user management

Discover Solfas Test Suite 2

Accelerate, automate and document your testing for efficient evaluation and accurate reporting.

Technical Specifications

Model STA Sinus STA Surge STA Sinus/Surge STA Sinus/Pulse
Sinus Output 5kV 100mA 500VA – 5kV 100mA 500VA 5kV 100mA 500VA
Surge Output – 6kV 1.8J 6kV 1.8J –
Pulse Output – – – ±2.5kV uni-/bipolar
Output Rise Time – – – 150ns/500ns selectable
Output Terminals 3 winding + 1 sensor + 1 frame / 6 winding with GSX6 option
PD Sensor High Frequency Current Transformer (HFCT) or HF Antenna
PD Detection Frequency range 200 … 400MHz, measurement range -60 … 0dBm
Safety Features Basic features: emergency stop button, red and green warning lights, start and stop button, safety interlock connector
Interface Ethernet
Power Supply 80-260VAC, 45-65Hz, IEC C14 connector
Form Factor 19″ 16U
Dimensions HxWxD 767mm x 533mm x 600mm
Weight 48kg 38kg 63kg 61kg

Any Questions?

Contact us directly.