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Description
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All available protection and logic functions are stored in the 216VC62a processing unit in the form of software module libraries. The user Settings for all activation functions and the configuration of protection, i.e. assigning I/P and O/P signals (channels) to protection functions, are also stored in this unit. The software is downloaded through an operating program. With the help of a portable user interface (PC), select and store the protection features required by a particular factory and their associated Settings. Each activated function requires a certain percentage of the total available computing power of the processing unit (see Section 3), which is 425% for the processing unit 216VC62a. 216VC62a can be used as both a processor and an interbay bus (IBB) interface in substation monitoring systems (SMS) and substation automation systems. Available communication protocols are:
SPA bus
LON bus
MCB interbus
MVB process bus.
The SPA bus interface is always available. The LON and MVB protocols are transmitted via PC cards. The power supply of the 216VC62a memory is maintained in the event of a gold capacitor interruption so that the event list interferes with the recorder data remaining intact. Interference recorder data can be read through the interface at the front end of the 216VC62a or the object bus. Data can be evaluated using the “EVECOM” evaluation program. The internal clock of the re216 can be synchronized via the sms /SCS system’s object bus interface or via radio clock. I/P signals (channels) from the B448C bus:
Digital measurement variables: primary system current and voltage
Logical signal: external I/P signal
24v auxiliary power and data exchange with B448C bus.
O/P signal (channel) to B448C bus:
Signal O/P protection and logical function selection
Trip O/P from protection and logic function selection
Data exchange with the B448C bus.
The digitised measured variables derived from the primary system quantities are continuously compared by the processing unit 216VC62a with the pick-up settings of the protection functions. If a protection function picks up, the corresponding signal or tripping command is transmitted via the B448C bus to the 216AB61 O/P unit resp. to the 216DB61 I/O unit. The allocation of the signals and tripping commands at the O/P’s of the protection functions to the various channels of the 216AB61 output unit or of the 216DB61 I/P signal and tripping unit is also determined by the software installed in the 216VC62a processor unit.
The external input signals connected to the protection energise the auxiliary relays K1…K16 in the 216GE61 I/P relay unit. The potentially-free contacts of K1…K16 transmit the external signals to the 216DB61 unit and thence to the B448C bus. By appropriate configuration of the software in the 216VC62a processing unit, external signals can be assigned to the various protection functions, e.g. for logical combination (interlocking and blocking)with trip signals or for exciting the tripping channels 1…8.
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