HGTINSULATION TESTERHand Operated Generator

Highly stable test voltage combinedwith high sensitivity

High Charging Current

Type Tested as per BIS2992 : 87

CE

5000

4000

3000

2000

1000

2 510 20 50 100 200 500 1000 2000 50000 100000

v

(MW)

Terminal outputs plottedon log scale

Free Accessories

Main lead 2m long.

One 3m Earth test lead with shrouded clips.

Operating manual.

One Screened 3m Line test lead with shrouded clips.

GENERALThe HGT series Insulation Testers are suitable for high voltage, heavy duty

work. The A.C. generator supplying the test voltage may be turned by a hand

crank. The output from the multi-pole generator is fed to a voltage multiplier

and stabilizing circuit and becomes the insulation test voltage. Stability of this

voltage is better than 0.1% under hand-cranking voltage stability is assisted

by a mechanical clutch.

A cross-coils ohmmeter is used to show the insulation resistance readings

directly in Megohms. The meter's deflecting circuit is assisted by a CURRENT

AMPLIFIER on its upper range, so that a high reading on a wide scale can be

achieved.

The three terminals marked 'L', 'GUARD' and 'E' are mounted on a small

panel recessed in to the side of the case, if required the 'GUARD' terminal

may be connected to divert any leakage currents to the voltage source rather

than allowing them to pass through the ohmmeter, thus eliminating their effects.

Each instrument is assembled in a Teak-wood case with a laminated

top panel.

*Specifications are subject to change without prior notice

APPLICATIONSThe instrument covers a wide variety of insulation testing requirements and

is especially suited to work on energy network systems. The insulation

tester is ideal for high voltage, heavy duty work, for example, such

applications as are found in the maintenance or servicing of large industrial

electrical installations, generators, distribution networks, switchgear etc.

The instrument can also be employed to make measurements designed to

show the gradual decline that takes place in insulation when this is attacked

by corrosion, dirt, grease, moisture etc. during the operational life of a

particular installation. Such monitoring enables the Maintenance Engineer to

anticipate future performance and to plan ahead.

The instrument can be used to show the improvement in insulation within

motor, generator and transformer windings etc. that results from drying out

procedures, where these have become necessary because of excessive

humidity or because of operation in a moisture laden atmosphere. The high

sensitivity of the instrument enables sensible reading to be obtained.

The terminal voltage characteristics show how this instrument produce

about 90% of its rated maximum voltage at loads as heavy as 50 megohms.

Maintaining near rated test voltage at heavy load is essential in true insulation

testing and is a characteristic of this instrument.

RIL/MK/C-08

SPECIFICATION

RANGES

2500 V 0-10,000 SR 2500

5000 V 0-10,000SR 5000

Voltage Outputd.c.

Insulation Range(Megohms)

OrderingCode

9kg (approx.)Weight

Short CircuitTerminal Current (max.)

2 mA d.c.SR50002.5 mA d.c. SR2500

_+3% of rated voltageTerminal Voltage (Setting at infinity)

+_0.76 mm (0.03 in) oras per BIS2992 : 87

Accuracy

160rpm (approx.)of generator

Clutch Slipping

320x230x170mm (approx.)Dimensions

Handle speedSpeed