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Description
Single and three-phase autoreclosure
Operation in conjunction with distance, overcurrent and synchrocheck functions and also with external
protection and synchrocheck relays
ABB 35AE92 2/4 axis serial communication motherboard
Table 36 Autoreclosure (79)
Single and three-phase autoreclosure
Operation in conjunction with distance, overcurrent and synchrocheck functions and also with external
protection and synchrocheck relays
Logic for 1st and 2nd main protections, duplex and master/follower schemes
Up to four fast or slow reclosure shots
Detection of evolving faults
4 independent parameter sets
Settings:
1st reclosure none
1P fault - 1P reclosure
1P fault - 3P reclosure
1P/3P fault - 3P reclosure
1P/3P fault - 1P/3P reclosure
2nd to 4th reclosure none
two reclosure cycles
three reclosure cycles
four reclosure cycles
Single phase dead time 0.05 to 300 s
Three-phase dead time 0.05 to 300 s
Dead time extension by ext. signal 0.05 to 300 s
Dead times for 2nd, 3rd and 4th reclosures 0.05 to 300 s
Fault duration time 0.05 to 300 s
Reclaim time 0.05 to 300 s
Blocking time 0.05 to 300 s
Single and three-phase discrimination times 0.1 to 300 s
All settings in steps of 0.01 s
Table 37 Synchrocheck (25)
Determination of synchronism
Single phase measurement. The differences between the amplitudes, phase-angles and frequencies
of two voltage vectors are determined.
Voltage supervision
Single or three-phase measurement
Evaluation of instantaneous values and therefore wider frequency range
Determination of maximum and minimum values in the case of three-phase inputs
Phase selection for voltage inputs
Provision for switching to a different voltage input (double busbar systems)
Remote selection of operating mode
4 independent parameter sets
Settings:
Max. voltage difference 0.05 to 0.4 UN in steps of 0.05 UN
Max. phase difference 5 to 80° in steps of 5°
Max. frequency difference 0.05 to 0.4 Hz in steps of 0.05 Hz
Min. voltage 0.6 to 1 UN in steps of 0.05 UN
Max. voltage 0.1 to 1 UN in steps of 0.05 UN
Supervision time 0.05 to 5 s in steps of 0.05 s
Resetting time 0 to 1 s in steps of 0.05 s
Accuracy
Voltage difference
Phase difference
Frequency difference
for 0.9 to 1.1 fN
±5% UN
±5°
±0.05 Hz
Table 38 Transformer differential protection (87T)
For two- and three-winding transformers
Three-phase function
Current-adaptive characteristic
High stability for external faults and current transformer saturation
No auxiliary transformers necessary because of vector group and CT ratio compensation
Inrush restraint using 2nd harmonic
Settings:
g-setting 0.1 to 0.5 IN in steps of 0.05 IN
v-setting 0.25 or 0.5 or 0.7
b-setting 1.25 to 2.5 in steps of 0.25 IN
Max. trip time (protected transformer loaded)
- for I >2 IN
- for I2 IN
30 ms
50 ms
Accuracy of pick-up value ±5% IN (at fN)
Reset conditions I <0.8 g-setting
Accuracy of pick-up value ±5% IN (at fN)
Reset conditions I <0.8 g-setting
Table 39 Thermal overload (49)
Thermal image for the 1st order model
Single or three-phase measurement with detection of maximum phase value
Settings:
Base current IB 0.5 to 2.5 IN in steps of 0.01 IN
Alarm stage 50 to 200% TN in steps of 1% N
Tripping stage 50 to 200% N in steps of 1% N
Thermal time constant 2 to 500 min in steps of 0.1 min
Accuracy of the thermal image ±5% N (at fN)
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