Ac Modules - GE D90 Plus Instruction Manual
Line distance protection system
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Also See for D90 Plus:
- Instruction manual (694 pages) ,
- Communications manual (222 pages) ,
- Instruction manual (602 pages)
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CHAPTER 3: INSTALLATION
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AC modules
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
•
DC power: 110, 125, 220, or 250 V DC
•
AC power: 115 or 230 V AC
Control power supplied to the relay must be connected to the matching power supply
range of the relay. If the voltage is applied to the wrong terminals, damage can occur.
Plus
The D90
system, like almost all electronic relays, contains electrolytic capacitors. These
capacitors are well known to deteriorate over time if voltage is not applied periodically.
Deterioration can be avoided by powering up the relay at least once a year.
The power supply module provides 48 V DC power for dry contact input connections and a
critical failure relay (see Typical Wiring Diagram earlier). The critical failure relay is a form-C
device that is energized once control power is applied and the relay has successfully
booted up with no critical self-test failures. If on-going self-test diagnostic checks detect a
critical failure or control power is lost, the relay de-energizes.
An AC module has voltage inputs on channels 8 through 12 inclusive. Channel 10 is
intended for connection to a source that represents phase A voltage of the power system
(produced by a VT or CVT). Likewise, channel 11 is intended for connection to phase B, and
channel 12 is intended for connection to phase C. The phase voltage channels are used for
most metering and protection purposes.
Channels 8 and 9 are intended for connection to single-phase sources. In the D90
of these inputs typically is used to measure the voltage on the side of the breaker opposite
to the line terminal. Each of these channels is labeled as an auxiliary voltage (VX). The
auxiliary voltage channels are used as inputs for synchrocheck, but can also be used for
auxiliary undervoltage or overvoltage elements.
An AC module has current inputs on channels 1 through 7 inclusive. In a single breaker
application, channel 1 is intended for connection to a source representing the phase A
current of the power system (produced by a CT). Likewise, channel 2 is intended for
connection to phase B, and channel 3 is intended for connection to phase C. In a breaker-
and-a-half application, channels 1 through 3 are connected to the phase A, B, and C
Figure 22: Control power connection
WIRING
Plus
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47
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