Biddle MEGGER - Page 36

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N

TOR

N

"

n

CONDUCTOR

UNDER

MEGGER

INSULATION

TESTER

3

CONDUCTOR

CABLE

FIGURE

40.

Showing

use

of

the

Guard

connection

to

eliminate

the

effect

of

leakage

to

ground,

as

in

Figure

38,

and

also

the

effect

of

leakage

to

adjacent

conductors.

Note

that

the

Guard

wire

is

wrapped

around

the

exposed

insulation

and

also

is

con-

nected

to

the

adjacent

conductors.

Do

not

confuse

this

diagram

with

Figure

38.

where

the

Guard

wire

goes

only

to

the

exposed

insulation,

ana

the

adjacent

con-

ductors

are

grounded,

quired

and

the

following

equations

used:

Ris

Ris

RY?

Tio

=

Ris

ERI

o

Κμ

Ra

(2

Rie

Ris

—

(R^)

?

తాతల.

where

Ryo,

Rəs

and

మ్మ

are

the

actual

readings

in

megohms

measured

across

the

terminals

of

the

network

which

are

con-

PINSUIEATHING

MATERIAL

"MEGGER"

INSULATION

TESTER

FIGURE

41.

To

eliminate

the

effect

of

surface

leakage

in

meas-

uring

the

true

resistance

of

an

insulating

member,

such

as

o

lift

rod

in

a

circuit

breaker.

[

34

]