High Precision automatic C, L - Haefely Test AG - #1

Automatic C, L & tan 5/ cos 9 precision measuring bridge

The measuring system type 2877 is designed for determining the capacitance and dielectric dissipation factor of liquid and solid insulants, cables, capacitors, line transformers, generators, motors, bushings etc. Furthermore it can also be used for power loss measurement on shunt reactors or similar apparatus.

This system is suitable for both low and high voltage measurement at line frequency. Fully automatic balancing of the bridge section is achieved by microcomputer and the measurement value is displayed on the LCD (liquid crystal display) which is built into the front panel. Operation is achieved with maximum user friendliness, thanks to the simple screen menus and on-line help, via the scratch resistant front panel.

Measurement reports can be printed via the parallel port (Centronics) interface. An external computer can also be connected via the RS-232C or optional IEEE 488 interfaces for control and data acquisition purposes. This measuring equipment has been specially developed to maximise efficiency in production and quality control environments. Its outstanding accuracy also makes it suitable for laboratory and research applications.

The instrument is supplied in a portable housing and comprises a bridge section and a microcomputer. The LCD display with backlight and the membrane keyboard are easily accessible and clearly arranged on the front panel. Measurement cables for connection to the test object, comparison standard and standard capacitors are not included in the scope of supply.

Automatic measurements with indication of the following values:

■ Test specimen capacitance CX

■ Dissipation Factor tan 5, Power Factor PF (cos 9)

■ Inductance LX, Quality Factor QF

■ Equivalent series Resistance RS

■ Real Power P, Apparent Power S, Reactive Power Q

■ Test specimen current Ix

■ Test Frequency f

■ Test Voltage as Peak, RMS or Peak/V2

Bridge balancing achieved with internal microcomputer Simple operation - menu driven Bridge balancing is independent of test frequency

■ Large measuring range for capacitance, dissipation factor tan 5 and inductance

■ Direct connection for charging currents up to 15 A

■ Built-in protection against electrical insulation failure of the test object and against stray electrical fields

■ Built-in test circuit and test program for checking the display and functions

Wide range of options:

■ Remote control via IEEE 488 interface or fibre-optic link for measurements of grounded test objects by connection of the bridge to the high voltage side

■ Software for automated high voltage testing and evaluation by an external computer

■ Control of test voltage supply equipment

■ Additional options according to customer specification

a brand of

Haefely is a subsidiary of Hubbell Incorporated.