Profile
The tasks of the working group are legally regulated and industrial metrology. The background to this is on the one hand the reliability of the transmission of electrical energy from the generator to the consumer and on the other hand the precise calculation of the energy consumption at high voltages and currents.
Research/Development
The working group researches and develops new measurement methods, automated measurement data acquisition and measurement devices in the fields of conventional and non-conventional measurement transformers as well as high-voltage measurement and generation devices. Furthermore, the working group participates in current topics of instrument transformer and high voltage technology in the context of national and international research projects. Part of this is technical cooperation with other countries to set up or improve metrology.
Services
The service area of the working group includes tests and calibrations of high-voltage measuring devices, instrument transformers, converter measuring devices, burdens, and burden measuring devices for the accredited test centers for measuring devices for electricity and other applicants. Furthermore, the support of test centers for measuring devices for electricity and the accredited calibration laboratories of the German Accreditation Body (DAkkS) is the responsibility of the working group.
Calibration System for Lightning Impulse and Switching Impulse Test Sets
| Short Name | LI / LIC / SI | |
| Principle | Comparision Method | |
| rel. ext. (k=2) Measurement Uncertainty | 0,3 % up to 0,5 % for Û 1 % up to 2 % for Time Parameter | |
| Measuring Conditions | 10 V up to 1500 kV
| |
Calibrator for Step Voltage
| Short Name | Step Voltage | |
| Principle | Step Method | |
| rel. ext. (k=2) Measurement Uncertainty | 5 % for Overshoot 5 ns up to 20 ns for Time Parameter | |
| Measuring Conditions | 1 % up to 5 % overshoot | |
Calibrator for Impulse Current
| Short Name | Impulse Current | |
| Principle | Comparision Method | |
| rel. ext. (k=2) Measurement Uncertainty | 0,5 % up to 0,6 % for Î 1,3 % up to 1,5 % for Time Parameter | |
| Measuring Conditions | 50 A up to 20 kA | |
Calibrator for High Voltage (HVAC)
| Short Name | HVAC | |
| Principle | Comparision Method | |
| rel. ext. (k=2) Measurement Uncertainty | 5·10-5 bis 1·10-4 | |
| Measuring Conditions | 1 kV up to 800 kV
| |
Calibrator for High Voltage (HVDC)
| Short Name | HVDC | |
| Principle | Comparision Method | |
| rel. ext. (k=2) Measurement Uncertainty | 2·10-6 up to 100·10-6 | |
| Measuring Conditions | up to ±400 kV
| |
Calibrator for Partial Discharge Test Sets
| Short Name | TE | |
| Principle | Direct Method | |
| rel. ext. (k=2) Measurement Uncertainty | (0.2 + 0.02q), q in pC | |
| Measuring Conditions | 1 pC up to 5000 pC
| |
Calibrator for Loss Factor Test Sets
| Short Name | tan (δ) | |
| Principle | Comparision Method | |
| rel. ext. (k=2) Measurement Uncertainty | 1·10-5 up to 1·10-3 | |
| Measuring Conditions | 1 pF up to 1000 pF For Low-Voltage: For High-Voltage:
| |
Calibrator for Capacity
| Short Name | C | |
| Principle | Comparision Method | |
| rel. ext. (k=2) Measurement Uncertainty | ≥1·10-4 | |
| Measuring Conditions | 1 pF up to 10000 pF For Low-Voltage: For High-Voltage:
| |
Calibrator for Instrument Transformer Test Sets
| Short Name | MAV III | |
| Principle | Comparision Method | |
| rel. ext. (k=2) Measurement Uncertainty | 10 ppm up to 100 ppm 10 µrad up to 100 µrad | |
| Measuring Conditions | 0.01 A up to 10 A
| |
Current Transformer Calibration System
| Short Name | SEKAM II | |
| Principle | Comparision Method | |
| rel. ext. (k=2) Measurement Uncertainty | 2 µA/A up to 30 µA/A 2 µrad up to 50 µrad | |
| Measuring Conditions | 0.05 A up to 100 kA
| |
Voltage Transformer Calibration System
| Short Name | ESM II | |
| Principle | Comparison Method | |
| rel. ext. (k=2) Measurement Uncertainty | 2 µV/V up to 100 µV/V 2 µrad up to 50 µrad | |
| Measuring Conditions | 30 V up to 300 kV
| |
Standard Burden Calibration System
| Short Name | BME II | |
| Principle | Impedance Measurement | |
| rel. ext. (k=2) Measurement Uncertainty | 0,1 % up to 1 % 0,1 crad up to 1 crad | |
| Measuring Conditions | 0,025 A up to 10 A
| |
Requirements and Testing Instructions regarding the Disclosure Requirement for Electroimpulse Devices (wireless devices)
List of approved Electroimpulse Devices