Withstand (Proof) Test A; Withstand (Proof) Test B; Example Of Display For Setting The Proof Test Voltage Level; Example Of Options In The Proof Test - Megger OTS 60PB Guide De L'utilisateur

Operation
BS 5730a LEPLC
Follows the same procedure as for BS 5730a test, but note that this test provides an initial stir for 1 minute
followed by a stand of 1 minute.
The test continues to Breakdown after the test is passed.

Withstand (Proof) Test A

1. From the main menu select the 'WITHSTAND' option. On the display screen the three soft keys then
become labelled 'A', 'B' and 'MENU'. (Pressing 'MENU' returns to the main menu options screen).
2. Press the left hand key labelled 'A'. The display screen appears as in figure 14.
Use the '▼', '▲' keys to decrease or increase the proof test voltage to obtain the desired acceptance
level.
Note:– Repeated individual presses of a key changes the value in 1 kV steps. Pressing and
holding a key changes the value in 1 kV steps to the next 5 kV value and thereafter in
5 kV steps.
3. Press 'SELECT' to move to the test option screen display as shown in the example of figure 15.
The 'QUIT' option moves back to the choice of proof test screen display.
4. Press and hold the 'STIR' key to stir the oil sample if necessary.
5. Press the 'START' key to begin a test. The test voltage will increase at 2 kV/s to the level set and
remain there for 1 minute (unless breakdown occurs first). The display shows the time for which the
voltage is applied.
6. The test voltage is automatically removed after 1 minute and the result of the test is given.
Figure 14
7. Press 'NEW' to go back to the test option screen ready for a repeat test. From this option press
'QUIT' and then 'MENU' to return to the main menu.

Withstand (Proof) Test B

Follow the procedure for WITHSTAND (PROOF) test A above but note that after the test voltage has been
maintained for 1 minute it will continue to rise at 2 kV/s to the breakdown point (or to the maximum value)
before it is automatically removed.
30 kV
CHANGE VOLTAGE
WITHSTAND
▲ ▼

Example of display for setting the proof test voltage level

WITHSTAND TEST
A B
Figure 15

Example of options in the proof test

A
SELECT
MENU
18