Functions
6-248 7SA6 Manual
C53000-G1176-C133-1
6.18 Analog Outputs
6.18.1 Method of Operation
Depending on the ordering version the 7SA6 relay up to four analog outputs are
available. During the configuration of the functional scope (see Figure 5.1) it was
determined which values may be transmitted via these interfaces. Up to four outputs
can be selected out of the following list:
• Measured value I
L2
(current of phase L2) in per cent of the operational nominal
current
• Measured value U
L2–L3
(phase-to-phase voltage L2-L3) in per cent of the
operational nominal voltage
• Measured value |P| (value of active power) in per cent of the operational nominal
power √3
·U
N
·I
N
• Measured value |Q| (value of reactive power) in per cent of the operational nominal
apparent power √3
·U
N
·I
N
• Fault distance d in per cent of line length on the basis of the configured reactance
per unit length and the line length (Address to , see also Subsection
6.1.3)
• Fault distance d in kilometres or miles, depending on the configured length unit
(Address , see also Subsection 6.1.1), on the basis of the configured
reactance per unit length (Address or , see also Subsection 6.1.3)
• Fault current I
max
, i. e. the maximum of 3 phase currents during clearance of the
last fault, primary in Ampere, on the basis of the configured primary and secondary
nominal current (Address and , see also Subsection 6.1.1)
The operational nominal values are the nominal values configured according to
Address and (see also Subsection 6.1.3).
The analog values are output as current source. The nominal range of the analog
outputs is 0 mA to 20 mA, the operating range may reach up to 22.5 mA. The
conversion factor and the valid range can be set.
6.18.2 Applying the Function Parameter Settings
Measure Values Once the measured values are selected (Section 5.1, Addresses to ), set
the conversion factor and the valid range for the available outputs, as follows:
for analog output 1 at mounting location “B” (Port B1):
Address P$% value in % to be indicated at 20 mA
Address 0,19$/8(%the minimum value permitted
for analog output 2 at mounting location “B” (Port B2):
Address P$% value in % to be indicated at 20 mA
Address 0,19$/8(% the minimum value permitted
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