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Functions
7202
Mean
U
I
=
=
or .
U∼
I∼
R.M.S.
2 mA
0172
DC PROTECTION
"1"
FNo. 05293
>BLOCK DC Prot.
Figure 2-115 Logic Diagram of the DC Voltage Protection
2.36.2 Setting Hints
General
Measuring
Procedure
236
MEAS.METHOD
mean value
absolute
formation
value
Rectifica-
mean value
tion
formation
10V
4-20 mA
20 mA
The DC voltage protection is only effective and accessible if it was set at address 0172
DC PROTECTION = Enabled during the configuration of the protection functions. Set
Disabled if the function is not required. For the associated measuring transducer 1,
either 10 V, 4–20 mA oder 20 mA has been selected during configuration at address
0295 TRANSDUCER 1 (see Section 2.3).
Jumpers X94, X95 and X67 on the C–I/O–6 module are used to set in the hardware
whether the measuring transducer input will be a voltage or a current input (see
Section 3.1.3). Their setting must correspond to the setting at address 0295. If it does
not, the device is blocked and issues an annunciation to that effect. When the relay is
delivered from the factory, the jumpers and configuration parameters are set to
voltage measurement.
Address 7201 DC PROTECTION is used to switch the function ON or OFF, or to block
only the trip command (Block Relay).
Normally an integrated average value filter is switched on. A high ripple content or
non-periodic peaks in the measurement voltage are averaged in this manner. The
polarity of the measured voltages is of no concern since the absolute value is taken.
Alternatively, a sinusoidal AC voltage can be measured (address 7202
MEAS.METHOD = RMS). The protection then multiplies the rectified average value with
1.11. The frequency of the AC voltage must match the frequency of other AC
quantities, because the latter determine the sampling rate. The maximum AC
amplitude must not exceed 10 V, so that for r.m.s. value measurement a maximum
setting of 7.0 V
is reasonable. The resulting higher secondary voltage can be
rms
reduced by means of a voltage divider.
7204 U DC ><
7205 I DC ><
7203 DC >/<
mean
r.m.s.
factor
1.11
&
&
FNo. 05306
DC Prot.pick.up
FNo. 05307
DC Prot. TRIP
7206 T DC
Tripping
&
matrix
TMin
TRIP CMD
FNo. 05308
Failure DC Prot
FNo. 05302
DC Prot.BLOCKED
7UM62 Manual
C53000-G1176-C149-3
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