Arc Flash Protection - GE MI-869 Instruction Manual

CONTROL

Arc Flash Protection

NOTE:
4–344
The Arc Flash Protection module supports fast and secure protection against an arc flash
event for a safe working environment.
Arc Flash protection utilizes a total of four light detection fiber sensors and dedicated high-
speed instantaneous overcurrent element with secure Finite Response Filtering. Light from
the light sensor AND logic with high-speed overcurrent ensures fast and secure operation.
Further enhancement includes continuous monitoring of individual light sensors with self-
test trouble indication. Four Arc Flash elements with self-test from the individual light
sensors can be used to design flexible Arc Flash protection schemes for different
configurations depending upon the physical locations of the sensors. Each individual
element can also provide a higher level of redundancy/reliability of the system.
In case any issues with the sensors are detected (i.e. failure of a self-test), the
corresponding light sensor trouble operands (i.e. "Light Sensor # Trouble" and "Light Sensor
Trouble") are asserted. Very fast detection of the Arc flash light event is also possible using
Light as the only detection parameter for alarm purposes. In addition, a user can design
customized logic using individual "AF1 Light # PKP" and "Arc Flash 1 S# OP" operands from
different light sensors in the FlexLogic engine.
Path:
Setpoints > Control > Arc Flash > Arc Flash 1
FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
The selection of Trip, Alarm, Latched Alarm or Configurable setting enables the HS
Phase/Ground IOC function.
HS Phase PKP
Range: 0.050 to 30.000 x CT in steps of 0.001 x CT
Default: 2.000 x CT
HS Ground PKP
Range: 0.050 to 30.000 x CT in steps of 0.001 x CT
Default: 1.000 x CT
The value of HS Gnd PICKUP can be set to a very high value, when only the HS Phs element
needs to be applied for Arc Flash detection.
LIGHT SENSOR 1(4)
Range: Disabled, Enabled
Default: Disabled
BLOCK
Range: Off, any operand from the list of FlexLogic operands
Default: Off
OUTPUT RELAYS
Range: Do Not Operate, Operate
Default: Do Not Operate
EVENTS
Range: Disabled, Enabled
Default: Enabled
This setting enables or disables the events of the Arc Flash function.
TARGETS
Range: Self-reset, Latched, Disabled
Default: Latched
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS