The 4860 series (measuring unit and highly accurate HV divider combining compressed gas and air capacitors). High precision standard voltage divider is used as a comparison standard in the differential method (bridge) measurement of high voltage instrument transformers. The special active guard controlled design of this divider set results in unmatched, high accuracy.
This standard voltage divider is ideal for integration with the instrument transformers test sets 2767 or 2769 test set in a full remote controlled instrument voltage transformer test system.

The high voltage divider unit comprises a capacitive high voltage divider (compressed gas standard capacitor C1 and air capacitor C2) and an electronic device in series, combine to form a variable electronic divider. Capacitive voltage divider C1/C2 divides the primary voltage Uprim to voltage U1, which is matched by the electronic device to the required secondary voltage Usec.
Voltage instrument transformers of less than 1 kV primary rated voltage can be connected directly to the electronic device via the adaptor box supplied with the divider.

Models

Advantages

• • • Highest versatility – Extended voltage measurement, from V to MV
    • Accuracy at best level – The 4860 series is prepared for accuracy testing of voltage instrument transformers with most stringent accuracy requirements – 4860 series is qualified for use as standard voltage transformers in metrology institutes
    • Highest flexibility – No additional voltage limitation due to use of an electronic device
    • Modularity – The electronic device can be easily configured for stand-alone use, at highest accuracy
    • Compatibility – The 4860 series can be integrated with various instrument transformers test sets and fitted on existing high voltage units for replacement, modernization and expansion projects
    • Traceability – In full chain calibration (on request)
    • Upgradeable to an automatic test system – By combination with a device type 2767 or 2769
    • More cost effective solution than inductive voltage standard transformers, especially for systems with high voltage ratings

    Applications

    • Voltage instrument transformers (LV/MV/HV)
    • Metrology institutes
    • Research and development