General - Siemens siprotec 7SA6 User Manual

Distance protection

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Routine Checks and Maintenance

General

Siemens numerical protective and control SIPROTEC

quire no special maintenance. All measurement and signal processing circuits are fully

solid state. All input modules are also fully solid state. The output relays are hermeti-

cally sealed or provided with protective covers.

Since the device is almost completely self-monitored, from the measuring inputs to the

output relays, hardware and software problems are automatically reported. The self-

monitoring ensures the high availability of the device and generally allows for a cor-

rective rather than preventive maintenance strategy. Therefore, maintenance checks

in short intervals are not required.

Operation of the device is automatically blocked when a hardware failure is detected.

The "live status" relay drops out to provide an alarm by its breaking contact. If a prob-

lem is detected in the external measuring circuits, the device normally only provides

Recognized software failures result in the resetting and restarting of the processor

system. If such a failure is not resolved by the restart, further restart attempts are ini-

tiated. If a problem is still present after three restart attempts, the device is automati-

cally taken out of service. Then the "live status" contact drops out to provide an alarm

and the red "ERROR" LED on the front panel illuminates.

The reaction of the device to failures and problems can be viewed in chronological se-

quence in the Operational messages. See Sub-section 7.1.1. The messages can be

used to diagnose the problem.

When the device communicates with a master control system of the substation or oth-

er central control systems, the event and alarm messages are also sent over the serial

4 devices are designed to re-

C53000-G1176-C133-1

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