Periodic Tests And Maintenance; Description; Tests Performed With The Xtm Combs; The Test Block Denomination - GE MLP1000 Manual

7. PERIODIC TESTS AND MAINTENANCE

7.1 DESCRIPTION

It is recommended to develop a periodic testing program to check all MLP functions
involved in the scheme used. It is left to the users discretion which of the ACCEPTANCE
TESTS should be applied depending on the installation.
NOTE : The tests results performed with sine wave generator equipment must be
interpreted cautiously, due to the fact that this equipment does not reflect the true behavior
of the electrical system, which can be achieved in a simulator.
The equipment needed for these tests is the same as for the acceptance tests with
the addition of XTM test combs

7.2 TESTS PERFORMED WITH THE XTM COMBS.

Description:
The XTM test combs are designed for tests on the equipment installed. There are
two types of test combs: the XTM28L1 (left) and the XTM28R1 (right); each one allows
access to 14 points on the relay side, and 14 on the system side. The points corresponding
to the system side are located on the exterior of the comb. The test combs are coded so
they cannot be accidentally exchanged.
The test combs are equipped with a sliding handle to allow wiring to the terminals.
The terminals are screw type on flat contact boards. The handles include a overhanging
PLANE which permits guiding the wires connected to the terminals.
Of the external relay connections, the ones wired through a test block allowing
access by the test combs are:
- AC inputs.
- AC voltage inputs.
- Standby voltage inputs.
- Trip contacts.
(see external connection diagrams in figures 3.1 to 3.12)

7.3 THE TEST BLOCK DENOMINATION.

The test block and connection combs are located on the left side of the test block.
Their terminals are labeled from 1 to 28, with numbers 1 to 14 labeled on the left side and
numbers 15 to 28 labeled on the right side. These points are designated in the external
connection diagram (figure 3) and in the tests schemes such as TPI to TP28.
The left test comb (XTM28L1) terminals are labeled from 1R to 14R and 1S to 14S
identifying the relay and system sides respectively, with the system side in red. In the same
way, the right test comb (XTM28R1) terminals are labeled from 15R to 28R and 15S to 28S
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