METREL MI 3298, Instruction Manual With Exercises

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Power Network Application Trainer Introduction MI 3298
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Sequence
’s allow measurements to be made according to standardized procedures
and performing more measurements under same task.
For example: single and sweep frequency 4-Pole measurements performed
automatically under same task.
Figure 22-1: Example of Auto Sequences under IEEE 81 -2012 Auto sequence
1.10 Safety precautions
Test personnel must strictly follow the safety rules before performing any
measurement on the test object. They should be aware, that a lethal potential can
exist between the station ground and remote ground in case that a power-system
fault involving the station ground occurs while ground tests are being made.
Safety precautions are described in the IEEE Std 81-2012 standard.
Safety procedures and practices adopted by the particular organization involved shall
be strictly followed.
1.10.1 Station ground tests

Reduced the hazards by wearing gloves and dielectrically rated footwear.

Exposed test leads and electrodes are isolated from workers and the general
public.

Short test periods assured and all test leads promptly removed after the test is
completed.

Remote probes and test leads are under continuous observation.

Ungrounded ends of test lead
’s parallel an energized line mitigated by the
physical orientation of test leads, grounding, or both of them.

Under no circumstances it should be allowed that two hands or other parts of the
body complete the current circuit between points of possible high potential
difference.
1.10.2 Surge arrester ground test
Special care and precautions should be taken for surge arrester ground continuity
tests:

The base of the surge arrester can approach line potential, so never disconnect
the ground of a surge arrester.