9.2.4 Manual Insulation Test
A manual “Insulation Test” is provided as a maintenance/fault finding tool. The manual test can only be
carried out when the load is not energised. When this test is performed the MCR relay is prevented
from closing at the completion of a healthy test.
Before a manual Insulation Test can be performed the following conditions must apply:
1. The Remote Display Module must be online with the Insulation Test page being displayed. This
is located on the ‘EARTH FAULT INFORMATION’ Page, level 3, position 2.
2. Pilot must be healthy (and any previous trips reset).
3. EFLO function must not be tripped.
4. Insulation Test function must not be tripped.
5. Outlet must not be running.
6. Outlet must not be in the process of ‘closing’.
7. Outlet must not be ‘Paused’
8. The ‘Lock’ digital input must be closed.
When the above conditions are met the <ENT> key must be pressed and held (for the duration of the
test). After 3 seconds the EFLO test will commence. If the test result is healthy the manual insulation
test is initiated. The test voltage is applied to the outgoing feeder while ever the above conditions are
held (including holding the <ENT> key). The test results are continuously calculated and displayed. The
operator should maintain the test at least long enough for the readings to stabilize, this being a function
of the cable length. Once the test is completed (usually by releasing the <ENT> key) the results are
held in memory until another insulation test is commenced either manually or as part of the starting
sequence, or IPD control power is lost.
The manual test can be carried out even if the ‘Ins.TstT:’ selection is set
to ‘none’ (i.e. the automatic insulation test in the starting sequence is
turned off).
If the ‘CCM’ selection (see Section 9.2.1) is not a CCMD Cable
Connecting Module, then the manual test will only perform an EFLO
test.
The status of the manual insulation test is shown on the Insulation Test Information Page (level 3,
position 3). A single letter following ‘Mt:’ indicates the status of the test:
Mt:x Manual Test is blocked - by any one or more of the conditions 1 to 8 above.
Mt:e Only the <ENT> key is required to initiate the manual test.
Mt:t The manual test is timing through the enabling period (3 seconds).
Mt:A The manual test is Active. The display will show measured values.
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