Setpoints Entry Methods; Common Setpoints - GE 845 Instruction Manual

CHAPTER 4: SETPOINTS

Setpoints Entry Methods

Common Setpoints

845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Before placing the relay in operation, setpoints defining system characteristics, inputs,
relay outputs, and protection settings must be entered, using one of the following
methods:
• Front panel, using the keypad and the display.
• Front USB port, connected to a portable computer running the EnerVista 8 Series
Setup software.
• Rear Ethernet (copper or fiber port connected to portable computer running the
EnerVista 8 Series Setup software.
• Wi-Fi wireless connection to a portable computer running the EnerVista 8 Series Setup
software.
• Rear RS485 port and a SCADA system running user-written software.
Any of these methods can be used to enter the same information. A computer, however,
makes entry much easier. Files can be stored and downloaded for fast, error free entry
when a computer is used. To facilitate this process, the GE EnerVista CD with the EnerVista
8 Series Setup software is supplied with the relay. The relay leaves the factory with
setpoints programmed to default values, and it is these values that are shown in all the
setpoint message illustrations.
At a minimum, the
SETPOINTS / SYSTEM
function correctly. To safeguard against the installation of a relay whose setpoints have
not been entered, the Out-Of-Service self-test warning is displayed. In addition, the Critical
Failure relay is de-energized. Once the relay has been programmed for the intended
application, the SETPOINTS / DEVICE/INSTALLATION / Device In Service setpoint should
be changed from "Not Ready" (the default) to "Ready".Before putting the relay in "Ready"
state, each page of setpoint messages should be worked through, entering values either
by keypad or computer.
To make the application of this device as simple as possible, similar methods of operation
and similar types of setpoints are incorporated in various features. Rather than repeat
operation descriptions for this class of setpoint throughout the manual, a general
description is presented in this overview. Details that are specific to a particular feature are
included in the discussion of the feature. The form and nature of these setpoints is
described below.
• FUNCTION setpoint: The
operational characteristic of each feature. The range for this setpoint is: "Disabled",
"Trip", "Alarm", "Latched Alarm", and "Configurable".
If the FUNCTION setpoint is selected as "Disabled", then the feature is not operational.
If the FUNCTION setpoint is selected as "Trip", then the feature is operational. When
the "Trip" function is selected and the feature operates, the output relay #1 "Trip"
operates, and the LED "TRIP" is lit.
If the FUNCTION setpoint is selected as "Alarm" or "Latched Alarm", then the feature is
operational. When this function is selected, and the feature operates, the LED "ALARM"
is lit, and any assigned auxiliary output relay operates. The "Trip" output relay does
not operate, and the LED "TRIP" is not lit.
When Alarm function is selected and the feature operates, the LED "ALARM" flashes,
and it self-resets when the operating conditions are cleared.
When Latched Alarm function is selected, and the feature operates, the LED "ALARM"
will flash during the operating condition, and will be steady lit after the conditions are
cleared. The LED "ALARM" can be reset by issuing reset command.
setpoints must be entered for the system to
<ELEMENT_NAME> FUNCTION
SETPOINTS MAIN MENU
setpoint determines the
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