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Sunday, August 5, 2012

Insulation Resistance Test

1.      OBJECTIVE
This Method of Statement is meant to describe in generality the Insulation Resistance Test process; which describes its general setup and how the test is carried out.
2.      SAFETY
All personnel should continuously and consciously observe his work area for any potentials danger and take adequate measures.

In general:

a)     All personnel should wear Personal Protective Equipments suitable for the work and work area (e.g helmet, safety boots, goggles, glove, etc)
b)       If working in live station, ensure that isolation is done and Permit To Work is issued. If possible, ensure no REMOTE operation is allowable such as put the section into LOCAL.
c)        Do not touch the injection cable when the testing in progress. If possible, make a distance around the test perimeter.
d)       Ensure fully discharge the apparatus once the test was done.
e)        Ensure that the working area is only at the permitted area
f)         Earth/ground test equipment

3.      GENERAL INSULATION RESISTANCE TEST
a.         General Setup

For this Method of Statement, we use KYORITSU High Voltage Resistance Tester as our test equipment.

Setup the equipment as shown in Figure 1 as we are going to measure the insulation resistance value of the circuit under test.

Ensure firm contact of test equipment cables and objects under test.
b.         Test Process

Having the setup prepared, the test itself is quite simply. Set the range switch to desired insulation resistance range.

1.    Phase to Ground Insulation Resistance Test.
-    Set the red lead to LINE and black lead to EARTH on the test set. Connect the LINE lead to primary terminal and EARTH lead to ground point.
-    Select range to 5kv then press the PRESS TO START button and measure for 1 minute.
-     The measurement value can be collected from the LCD monitor.
-      Record down the result.

2.         Phase to Phase Insulation Resistance Test.
-   Set the red lead to LINE and black lead to EARTH from the test set. Connect the LINE lead to primary terminal and EARTH lead to secondary point.
-      Select range to 5kv then press the PRESS TO START button and measure for 1 minute.
-      The measurement value can be collected from the LCD monitor.
-    Record down the result.

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