XVC770AE 3BHE006414R0001 ABB analog control board
Technical data General
Reference value:
The specified value of an influencing factor to which are referred the characteristics of the equipment.
Nominal range:
The range of values of an influencing quantity (factor) within which, under specified conditions, the equipment meets the
specified requirements.
Operative range:
The range of values of a given energizing quantity for which the equipment, under specified conditions, is able to perform
its intended functions according to the specified requirements.
XVC770AE 3BHE006414R0001 ABB analog control board
XVC770AE 3BHE006414R0001 ABB analog control board
General current and voltage
The protection module is recommended as a general backup protection with many possible application areas due to its flexible measuring and setting facilities. The built-in overcurrent protection feature has two settable current levels. Both of them can be used either with definite time or inverse time characteristic. The overcurrent protection steps can be made directional with selectable voltage polarizing quantity. Additionally they can be voltage and/or
current controlled/restrained. 2nd harmonic restraining facility is available as well. At too low polarizing voltage the overcurrent feature can be either blocked, made non directional or ordered to use voltage memory in accordance with a parameter setting.Additionally two overvoltage and two undervoltage steps, either with definite time or inverse time characteristic, are available within each function.The general function suits applications with underimpedance and voltage controlled overcurrent solutions. The general function can also be utilized for generator transformer protection applications where positive, negative or zero sequence components of current and voltage quantities is typically
required.
XVC770AE 3BHE006414R0001 ABB analog control board
XVC770AE 3BHE006414R0001 ABB analog control board
Current circuit supervision (RDIF)
Open or short circuited current transformer cores can cause unwanted operation of many protection functions such as differential, earth fault current and negative sequence current functions.It must be remembered that a blocking of protection functions at an occurring open CT circuit will mean that the situation will remain and extremely high voltages will stress the secondary circuit.The current circuit supervision function compares the residual current from a three phase set of current transformer cores with the neutral point current on a separate input taken from another set of cores on the current transformer.A detection of a difference indicates a fault in the circuit and is used as alarm or to block protection functions expected to give unwanted tripping.
XVC770AE 3BHE006414R0001 ABB analog control board
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