Dcma Outputs - GE T60 Instruction Manual

CHAPTER 5: SETTINGS

5.10.4 DCmA outputs

SETTINGS  TRANSDUCER I/O  DCMA OUTPUTS  DCMA OUTPUT F1(W8)
 DCMA OUTPUT F1

Hardware and software is provided to generate DCmA signals that allow interfacing with external equipment. Hardware
details are contained in chapter 3. The DCmA output channels are arranged in a manner similar to transducer input or CT
and VT channels. The user configures individual channels with the settings as follows.
The channels are arranged in sub-modules of two channels, numbered 1 through 8 from top to bottom. On power-up, the
relay automatically generates configuration settings for every channel, based on the order code, in the same manner used
for CTs and VTs. Each channel is assigned a slot letter followed by the row number, 1 through 8 inclusive, which is used as
the channel number.
Both the output range and a signal driving a given output are user-programmable via the following settings menu (an
example for channel M5 is shown).
The relay checks the driving signal (x in equations below) for the minimum and maximum limits, and subsequently re-
scales so the limits defined as
following equation is applied:
where
x is a driving signal specified by the
I and I are defined by the
min max
k is a scaling constant calculated as:
The feature is intentionally inhibited if the
– < 0.1 pu. The resulting characteristic is illustrated in the following figure.
MIN VAL
T60 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
DCMA OUTPUT F1

SOURCE: Off
DCMA OUTPUT F1

RANGE: –1 to 1 mA
DCMA OUTPUT F1

MIN VAL: 0.000 pu
DCMA OUTPUT F1

MAX VAL: 1.000 pu
and match the output range of the hardware defined as
MIN VAL MAX VAL
setting
SOURCE
setting
RANGE
and
MAX VAL MIN VAL
Range: Off, any analog actual value parameter
Range: –1 to 1 mA, 0 to 1 mA, 4 to 20 mA
Range: –90.000 to 90.000 pu in steps of 0.001
Range: –90.000 to 90.000 pu in steps of 0.001
settings are entered incorrectly, for example when
TRANSDUCER INPUTS/OUTPUTS
. The
RANGE
Eq. 5-62
Eq. 5-63
MAX VAL
5-361
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