Deep Insights into Winding Insulation
Partial Discharge measurements pave the way to higher quality and durablity of electrical motors and other winding goods by detecting quality faults in insulation.
Partial Discharges at a stator during sinus test voltage
System Architecture
4 Models with different sources
You can choose between 4 models equipped with different sources. STA Sinus, STA Surge, STA Surge/Sinus, STA Pulse/Sinus.
Basic, Advanced or Custom Safety
A basic safety unit is installed ex works. Consisting of emergency stop, start & stop buttons, warning lights and an interface for external safety circuits.
Equipped with High Voltage Switching Matrix
The Switching Matrix allows the automatic switching of the different voltage sources and output connection configurations for various tests. Several test steps can be performed automatically without manual reconnection or reconfiguration of the test setup.
Partial Discharge Acquisition
Partial discharges are measured in the UHF range with high sensitivity. The attenuation against interference in the frequency range below 100MHz is very high, which allows measurements with various test voltages.
We offer the following 2 options for PD acquisition:
HF Antenna
High frequency PD acquisition at stators.
The antenna can be placed inside or near to the stator.
Multi Terminal Coupling Unit
The HFCT coupling unit is the best choice for mounted motors.
Safety First
Each STA Advanced model is equipped wit Basic Safety Features.
More complex safety requirements with many sensors can be achieved by our Custom Safety Unit SCU10, which offers a programmable safety control that can easily adapted to custom requirements in production environments.
More complex safety requirements can be achieved by our Custom Safety Unit SCU10. It offers programmable safety control that can be adapted to custom requirements in production environments.
Overview Safety Options
Basic (included)
- Emergency Stop
- Start & Stop Buttons
- Warning Lights
- –
- –
- –
- –
- –
Advanced (for external safety guard)
- Emergency Stop
- Start & Stop Buttons
- Warning Lights
- 1 external Safety Guard
- External Emergency Stop
- External Operation Panel
- Dual channel sensor inputs with earth fault and short circuit detection
- –
Custom (for special requirements)
- Emergency Stop
- Start & Stop Buttons
- Warning Lights
- up to 5 external Safety Guard
- External Emergency Stop
- External Operation Panel
- Dual channel sensor inputs with earth fault and short circuit detection
- Customizable
Control Unit
All STA models are shipped with a control unit. It consists of a Microsoft Windows 10 64-bit PC with the installed and pre-configured Solfas Test Suite.
We support you and take care of your product
We also help you after buying our products. Whether maintenance, support, repair or calibration, it does not matter, we care about you and your products.
| Model | STA Sinus | STA Surge | STA Sinus/Pulse | STA Sinus/Surge |
| Sinus Output | 5kV – 100mA – 500VA | – | 5kV – 100mA – 500VA | – |
| Surge Output | – | 3kV 0.45J 6kV 1.8J with Option S6K |
– | 3kV 0.45J 6kV 1.8J with Option S6K |
| Pulse Output | – | – | ±2.5kV uni-/bipolar | – |
| Output Rise Time | – | – | 150ns/500ns selectable | – |
| Output Terminals | <1% 4/7 with Option -7OT | |||
| 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″ 12U | 19″ 12U | 19″ 16U | 19″ 16U |
| Demensions HxWxD | 589mm x 533mm x 600mm | 589mm x 533mm x 600mm | 767mm x 533mm x 600mm | 767mm x 533mm x 600mm |
| Weight | 48kg | 38kg | 63kg | 61kg |
ECM Extension
With this calibrated instrument the environmental air temperature, humidity and pressure are measured and included in the test report.
| Temperature | -25°C … +70°C ±0.5% of value ±0.1°C |
| Relative Humidity | 0.0% … 100.0% RH ±2.5% RH Accuracy (at 11%-90% RH) |
| Air Pressure | 10.0 … 1100.0 mbar ±1.5 mbar (at 750-1100 mbar) |
WRM Extension
The WRM Option adds a precision winding resistance measurement to the system. This extends the STA to an full-featured stator test system.
AVM Extension
This option gives you the ability to measure the required test voltage details and export this data and plots to test reports by engaging an high power oscilloscope. The voltage measurement can be connected directly at the stator or motor terminals and is done with a differential probe.
| Channels | Voltage + PD |
| High Voltage differential measurement | up to 6kV |
| Bandwith | 100 MHz |
| Resolution | 14 Bit |
GPDC10 Calibrator
The GPDC10 is a calibrator for PD measurements according to IEC60270 and IEC/TS61934.
Surge Voltage 6kV Upgrade
This option extends the range of the surge voltage test from 3kV to 6kV.
Switch Matrix Upgrades
This options extends the number of switching matrix output terminals from 4 to 7. This allows the connection of stators with 6 terminals and frame. Switch matrix configurations with custom number of terminals are available on request.