Alstom MiCOM P50 Agile P15D, Technical Manual

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P50 Agile P15D
7 Protection Parametre Settings
P15D/EN TM/B 7-11
2.8.7 IN>3 Function
Sr. No Parameter Default setting Setting Range
1. IN>3 Function IEC S Inverse Disabled / DT / IEC S Inverse / S Inverse 1.3Sec / IEC V
Inverse / IEC E Inverse / UK LT Inverse / IEEE M Inverse / IEEE
V Inverse / IEEE E Inverse / US Inverse / US ST Inverse
This setting determines the tripping characteristic for the third stage earth fault current element.
2.
IN>3 Current Set 1*In If DT 1.0 to 35.00* In step 0.01*In
If IDMT then 0.10 to 2.50* In step 0.01*In
This setting determines the pick-up setting for third stage earth fault current element.
3.
IN>3 Time Delay 1 000.00 to 200.00s step 0.01s
This setting determines the time-delay for the definite time setting, if selected for third stage earth fault element.
4.
IN>3 TMS 1 0.025 to 1.200 step 0.005
This setting determines the time multiplier setting to adjust the operating time of the IEC IDMT characteristic.
5.
IN>3Time Dial 1 000.01 to 100.00 step 0.01
This setting determines the time multiplier setting to adjust the operating time of the IEEE IDMT curves.
6.
IN>3 tRESET 0 000.00 to 100.00s step 0.01s
This setting determines the reset/release time for all types of curves.
7.
IN>3 2H Blocking Disabled Enabled / Disabled
This setting determines the enabling/disabling of blocking third stage of Earth fault element due to presence of inrush current.
If IN>3 Blocking and 2nd Harmonic both setting are enabled, then (IN>3) trip command will be blocked in case 2nd harmonics content
in any phase is above the 2ndHarm Thresh. and fundamental current is below I> lift 2H setting . (Set in SYSTEM CONFIG Menu.)
2.8.8 Thermal Overload
Sr. No Parameter Default setting Setting Range
1. Characteristic Single Disabled/ Single
This setting determines the operating characteristic of the thermal overload element.
2.
Thermal Trip 1*In 0.10 to 4.00* In step 0.01 In
This setting determines the maximum full load current allowed and the pick-up threshold of the thermal characteristic.
3.
Thermal Alarm 70 50 to 100% step 1%
This setting determines the thermal state threshold corresponding to a percentage of the trip threshold at which an alarm will be
generated.
4.
Time constant 1 10 001 to 200 min step 1min
This setting determines the thermal time constant for a single time constant characteristic.
5.
K factor 1.05 1 to 1.5 step 0.01
This setting specify the k constant of thermal over load function
2.8.9 Undercurrent
Sr. No Parameter Default setting Setting Range
1. I< Status Disabled Enabled / Disabled
This setting is used to enable or disable the Undercurrent protection.
2.
I< 1*In 0.1In – 1.00*In step 0.01*In
This setting determines Pick-up setting for undercurrent element.
3.
tI< 10 0.20s to 100s in step 0.01s
This setting determines the time-delay for tripping.