- ページ 26

産業機器 Siemens 3AHのPDF 取扱説明書をオンラインで閲覧またはダウンロードできます。Siemens 3AH 38 ページ。 Vacuum circuit breaker operator module
Siemens 3AH にも：取扱説明書、インストール、操作、メンテナンス (33 ページ), インストレーションオペレーション＆メンテナンス (20 ページ)

ページを印刷する

1. Table of Contents

Mai n ten ance

Figure 18. Circuit Breaker Pole Assembly /Vacuum Check Mech anical / Contact Resistance Test

N ote: Do n ot use DC high potential testers incorporat

ing half-wave rectification. T hese devices produce

high peak voltages.

These high voltages will produce X-ray rad iation.

These devices also show erroneous readings of leak

age current when testing vacuum circuit breakers.

Vacuum lntegrityTest Procedure

1. Observe safety precautions l isted in the d anger a n d warn

ing advisories. Construct the proper barrier and warn i n g

light system .

2. Ground each pole not u n der test.

3. Apply test voltage across each pole for one minute (Circuit

Breaker open).

4. If the pole sustains the test voltage for that period, its

vacu u m integrity has been verified.

Note: This test i ncludes not only the vacu um interrupter,

but also the other insulation components in parallel with the

vacuum interrupter. These include the post insulators

Prinary Contact

Res stance Test

Step 2

PrimarY Contac t

Closed Positi:l n - �nsulated

C ol-Per Dl!connected)

prinary contact

Open Position - (Forced

by tlar&.�al

Open

Pressure)

alingC oupleq

sui

(Operating Posti:ln)

(Lo.vered Position)

(Se p 2)

a n d the insulati ng coupler, as well as the insulating (tension )

struts between the upper and lower vacuu m i nterrupter sup

ports. If these insu lation components a re contam i n ated or

defective, the test voltage will not be sustained. If so, clean

or replace the affected components, and retest.

As-Found Insulation and Contact Resistance Tests

As-Found tests verify the integrity of the circ u it breaker

insulation system . Megger or insulation resistance tests

conducted on equipment prior to installation provide a basis

of future comparison to detect changes in the protection

afforded by the insulation system. A permanent record of

periodic As-Found tests enables the maintenance organ iza

tion to determine when corrective actions are req u ired by

watch ing for significant deterioration in insu lation resis

tance, or increases in contact resistance.

Insulation and Contact Resistance Test Equipment

In a ddition to the High PotentiaiTest Equipment capable of

test voltages as listed in Table 4, the following equ ipment is

also req uired:

• AC Hig h Potential tester with test voltage of 1 500 volts,

60 Hz

•Test equipment for contact resistance tests.

48)

( 48)