Installation And Maintenance; Installation; Connection To Ground And Suppression Of Disturbances; Maintenance - GE SMOR-B GEK 105593C Instructions Manual

Protection, monitoring, analysis, and energy management numerical system

7. 7. 7. 7.

The relay should be installed in a clean, dry and dust-free place, with no vibrations. It should also be well-lit

to facilitate inspection and testing.

The relay should be mounted on a vertical surface. Figure 1 shows the diagram for panel drilling for panel

mounting.

Given that the design of the SMOR unit is based on high performance digital technology it is not necessary

to recalibrate the relay. However if the tests show that it is necessary to readjust the relay, it is recommended

that the unit should be returned to the manufacturer to have this done.

A9 and B9 terminals (see figure 7) should be connected to ground so that the disturbance suppression

circuits in the system work correctly. This connection should be as short as possible (preferably 25 cm or

less) to guarantee maximum protection. In this way the capacitors which are internally connected between

the inputs and ground divert high frequency disturbances directly to ground without passing through the

electronic circuits, with the result that the circuits are perfectly protected.

In addition this connection also guarantees the physical safety of the personnel who have to touch the relay,

since the whole casing is connected to ground.

Given the important role that the protection relays play in the operation of any installation, a periodic program

of tests is highly recommended. The unit incorporates built-in diagnostic functions which permit immediate

identification with only the aid of the keyboard and display, the detection of some of the most likely circuit

failures. Testing the unit is recommended at intervals of 2 years or more. Although the built-in diagnosis does

not reduce the average time between failures, it does increase the availability of the protection because it

allows a drastic reduction in the average interruption time involved in detecting and repairing the fault.

The set of tests which can be carried out to test that all the features of the SMOR unit function properly is

described in detail in the chapter entitled ACCEPTANCE TESTS.

Since most of the protection and communications functions are integrated in two separate programs, it is

unlikely that faults will occur due to problems of wear or ageing which are typical in electromechanical,

analog or hybrid protection systems. Moreover, a failure in the communications processor does not affect the

protection functions, which are implemented by a dedicated processor.

GEK-105593C

INSTALLATION AND MAINTENANCE

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