K-PAS Local warning and alarm system
Description
Local warning and alarm system K-PAS acquires switchgear equipment data and data transmitted by microprocessor-based protection devices and/or load parameter measuring devices, and displays them in the form of graphics and narratives (local visualization panel) which are very handy for a quick review of emergency and contingency causes.
The process is simultaneously accompanied by light and sound alarms and pre-alarms.
Design
A local visualization panel of the communications system displays the following graphical information in a suitable format readable at a meter’s distance, while using dedicated color codes:
-
A switchgear electric power supply diagram, with all data listed in items 2 to 5 below
- State of all main circuit connections (On, Off, Unprotected) individually for circuit breakers and contactors
- Draw-out element or unit position data (if any withdrawable designs are used)
- Real-time and cumulative electrical readings of all connections with a trend view capability.
- Temperature at the CB / draw-out unit power connections on each phase at the joint with the switchgear busbars and outgoing cable connections. These readings are displayed in real time and cumulatively, with a trend view capability.
- State change log data for all connections and auxiliary systems (automatic transfer switch, underfrequency load shedding, CB fail protection etc.) and communication failure data, with precise time and histories saved for on-screen display. An event log keeps at least 1,000 records in a circular buffer. The event log provides no editing capability.
All devices for data acquisition, processing and transmission and other elements which functionally relate to communications are located immediately within the switchgear.
The switchgear status and event log data should be able to be transmitted to an EHT process control (or equivalent) system via Ethernet or a fibre optic line using an IEC61850 protocol.
Uninterrupted power supply is ensured with a self-test UPS unit with a built-in battery and an interface device for UPS monitoring. The UPS unit is capable of powering the communications system for at least 30 minutes in case of external power supply failure.