Hysteresis Settings
Description
Hysteresis settings are used for calculating reset threshold of protection alarm and pickup.
Pickup or alarm threshold are set by protection settings. For reset threshold calculation LTMT main unit uses hysteresis settings.
For example, if overcurrent protection pickup is set at 100% of full load current (IFLC), and if hysteresis settings for current protections is set at 3%, the pickup reset threshold level for overcurrent protection is 97% of IFLC.
Over protections:
Under
protections:
Hysteresis is fixed for the following protections:
-
Voltage phase loss - 35% of imbalance
-
Current phase loss - 15% of IFLC
-
Voltage imbalance - 3% of imbalance
Parameter Settings
|
Parameter |
Setting range |
Default value |
|---|---|---|
|
Hysteresis for current protection |
3–15 % in step of 1% |
3% |
|
Hysteresis for voltage protection |
3–15 % in step of 1% |
3% |
|
Hysteresis for frequency protection |
1–15 % in step of 1% |
3% |
|
Hysteresis for power protection |
3–15 % in step of 1% |
3% |
|
Hysteresis for temperature protection |
2–15 °C in step of 1 °C |
5 °C |