4860 Standard Electronic Voltage Dividers The 4860 series (control unit and capacitive HV divider with compressed gas and air capacitors) high precision standard voltage divider is used as a variable 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 highest accuracy. This standard voltage divider is ideal for integration with the 2767 or 2769 test set in a full remote controlled instrument voltage transformer test system Universal comparison standard for any transformer ratios within a wide voltage range Very accurate voltage divider ratio (± 50 ppm, ± 0.1 min) Max. measurement voltage is dependent only on rated voltage of compressed gas capacitor For voltages less than 1000 V the electronic device can be used without additional divider VOLTAGE DIVIDER ARRANGEMENT HIGH VOLTAGE DIVIDER UNIT 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, constituting a variable electronic divider (see system diagram). Capacitive voltage divider C1/C2 divides the primary voltage Uprim to voltage U1, which the electronic device matches to the required secondary voltage Usec. Voltage instrument transformers of less than 1 kV primary voltage can be connected directly to the electronic system via the adaptor box supplied with the divider. Easy handling Suitable for all Tettex (2767, 2765, 2711/22 and 2711/23) and many other manufacturers’ transformer test sets Direct replacement of earlier series 4850 Existing compressed gas capacitors can generally be equipped to form a complete system. Complete system is certifiable Remote control possibility via IEEE 488 or RS 232C interface ELECTRONIC DEVICE The main components of this system are an input amplifier and a guard-potential control (up to 1010 V), an electronic divider and a power amplifier with the output stage. The instrument is protected against setting errors, overvoltages and short-circuits. Errors message are indicated on the dot matrix display. to an automatic combination with a type 2767 A more cost-effective solution than inductive voltage standard transformers, especially for high rated voltage systems.

BASIC TEST SET-UP Measurement circuit with capacitive divider for > 1 kV primary voltage Legend for abbreviations used PV Primary rated voltage SV Secondary rated voltage CR Capacitive divider ratio (C-Ratio) Uprim Primary voltage Usec Secondary voltage U1 Electronic divider input voltage U Test voltage (primary or secondary) UR Rated voltage (primary or secondary) U/UR Excitation ELECTRONIC STANDARD VOLTAGE DIVIDER SERIES 4860 STANDARD SYSTEMS C1 Type (gas) [Serie/pF/kV] Measurement range (Uprim) * range covered by any other type e.g. 4861/300

TYPE 4861 STANDARD VERSION GENERAL DATA This version has up to two fixed voltage divider ratios set by HAEFELY HIPOTRONICS, which the user cannot change. The complete standard voltage divider is therefore certifiable. Power supply TYPE 4862 CUSTOMIZED VERSION The user can set two ratios and change them whenever needed. This standard divider is not certifiable. Power requirement Storage and transport temperature ERROR LIMITS TECHNICAL SPECIFICATIONS Intrinsic error (electronic device) ELECTRONIC SYSTEM TYPES 4861 Input Max. input voltage U1 Test frequency Input resistance Input capacitance Measurement...

ORDER SPECIFICATION STANDARD SUPPLY Standard voltage divider as per standard system type series 4860, comprising: Electronic device - RS 232C interface (fibre optic data-link) Adaptor box for direct connection, Triax/coax adapter for compressed gas capacitor (for C/tan δ measurement) Measuring cable, 10 m Measuring cable, 1.5 m Replacement of series 4850 electronic device by type 4861 The connections are compatible with the existing unit. Determine and set the capacity divider ratio. Power cable Power voltage (please specify with order) Including RS 232C interface Adaption and commissioning of...