Table of Contents
Advertisement
CHAPTER 4: SETPOINTS
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
PICKUP
Range: -30.000 to 30.000 pu in steps of 0.001 pu
Default: 1.000
This setting specifies the operating threshold for the effective operating signal of the
element.
If the "Over" direction is set, the element picks up when the operating signal exceeds the
PICKUP value.
If the "Under" direction is set, the element picks up when the operating signal falls below
the PICKUP value.
The HYSTERESIS setting controls the element drop out.
Notice that both the operating signal and the pickup threshold can be negative when
facilitating applications such as reverse power alarms.
The FlexElement can be programmed to work with all analog values measured or
computed by the relay. The PICKUP setting is entered in pu values using the following
definitions of the base units:
Table 4-35: Definitions of the Base Unit for the FLEXELEMENT
Measured or calculated analog
value related to:
Voltage
Current
Power
Power Factor
Phase Angle
Harmonic Content
THD
Frequency
Volt/Hz
RTDs
2
I
t (arcing Amps)
Current Unbalance
Source Energy (Positive and Negative
Watthours, Positive and Negative
Varhours)
Differential and Restraint Currents
(Percent Differential)
Thermal Capacity Used
Thermal Lockout Time
Thermal Model Load and Biased
Motor Load
Trip Time on Overload
Impedance
Base Unit
V
= maximum nominal primary RMS value of the Input
BASE
1(+) and input 2(-) inputs
I
= maximum nominal primary RMS value of the Input 1(+)
BASE
and input 2(-) inputs
P
= maximum value of V
BASE
BASE
input 2(-) inputs
PF
= 1.00
BASE
DegBASE = 360 deg
H
= 100% of nominal
BASE
THD
= 100%
BASE
f
= nominal frequency as entered under the SYSTEM
BASE
SETUP menu
BASE = 1.00
BASE = 1.00°C
2
BASE = 2000 kA
*cycle
BASE = 1.00%
EBASE = 10000 MWh or MVAh, respectively
I
= Primary of the CT with maximum primary current
BASE
rating
BASE = 1.00%
BASE = 10 minutes
BASE = 1.00 pu of FLA
BASE = 10 seconds
Z
= PhaseVTSecondary / PhaseCTSecondary, where
BASE
PhaseVTSecondary and PhaseCTSecondary are the
secondary nominal voltage and the secondary nominal
current of voltage and current bank to calculate the
impedance.
PhaseVTSecondary is specified in the setting under
Setpoints > System > Voltage Sensing, and
PhaseCTSecondary is determined by the order code.
FLEXLOGIC
* I
for the Input 1(+) and
BASE
4–365
Advertisement
Table of Contents
