4860 Electronic Divider System0 pages

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

FEATURES

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.

Upgradeable

to an automatic
combination with a type 2767

test

system

by

A more cost-effective solution than inductive voltage
standard transformers, especially for high rated voltage
systems.

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