Biddle MEGGER - Page 21

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8.

Power

Transformers

“MEGGER”

INSULATION

FIGURE

19

Connections

for

testing

insulation

resistance

of

a

transformer

high

voltage

winding

and

bushings,

and

the

high

tension

discon-

nect

switch—in

parallel,

with

reference

to

the

low

voltage

winding

and

ground.

Note

that

the

low

voltage

winding

is

grounded

for

this

test.

τν

ay

HV

|

ο

©

ϐ

(άν

|

మా

hint

౩

“MEGGER

]

c

INSULATION

TESTER

రా

A

re

AR

Ἔ

FIGURE

20

|

Same

as

F

igure

19

but

without

being

affected

by

leakage

be-

tween

the

high

and

low

voltage

windings.

Note

use

of

Guard

connection.

[19]