Phase Timed Overcurrent (51P) - GE 339 Instruction Manual

S3 PROTECTION

Phase timed overcurrent (51P)

6–70
Multiplier (TDM)
1.5 2.0
1.0 2.901 1.312
2.0 5.802 2.624
4.0 11.605 5.248
6.0 17.407 7.872
8.0 23.209 10.497 4.299
10.0 29.012 13.121 5.374
IAC Inverse
0.5 0.578 0.375
1.0 1.155 0.749
2.0 2.310 1.499
4.0 4.621 2.997
6.0 6.931 4.496
8.0 9.242 5.995
10.0 11.552 7.494
IAC Short Inverse
0.5 0.072 0.047
1.0 0.143 0.095
2.0 0.286 0.190
4.0 0.573 0.379
6.0 0.859 0.569
8.0 1.145 0.759
10.0 1.431 0.948
The settings of this function are applied to each of the three phases to produce phase
overcurrent trip or pickup. There is no intentional "dead band" where the current is above
the pickup level. However the pickup accuracy is guaranteed within the current input
accuracy of 3% above the set PKP value. The TOC pickup flag is asserted when the current
on any phase is above the PKP value. The TOC trip flag is asserted if the element stays
picked up for the time defined by the selected inverse curve and the magnitude of the
current. The element drops from pickup without operating if the measured current drops
below 97-99% of the pickup value before the time for operation is reached. When Definite
Time is selected, the time for TOC operation is defined only by the TDM setting. The
selection of Definite Time has a base time delay of 0.1 s, multiplied by the selected TD
multiplier. For example the operating time for TOC set to Definite Time and a TDM set to 5
will result in 5*0.1 = 0.5 s applying the time delay accuracy outlined under the Technical
Specification, and adding approximately 8 to 10 ms output relay time.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH:
SETPOINTS > S3 PROTECTION > PHASE TOC
PH TOC FUNCTION
Range: Disabled, Latched Alarm, Alarm, Trip
Default: Disabled
For details see Common
3.0 4.0 5.0
0.537 0.343 0.266
1.075 0.687 0.533
2.150 1.374 1.065
3.225 2.061 1.598
2.747 2.131
3.434 2.663
0.266 0.221 0.196
0.532 0.443 0.392
1.064 0.885 0.784
2.128 1.770 1.569
3.192 2.656 2.353
4.256 3.541 3.138
5.320 4.426 3.922
0.035 0.031 0.028
0.070 0.061 0.057
0.140 0.123 0.114
0.279 0.245 0.228
0.419 0.368 0.341
0.559 0.490 0.455
0.699 0.613 0.569
setpoints.
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS
6.0 7.0 8.0 9.0
0.227 0.202 0.186 0.174
0.453 0.405 0.372 0.349
0.906 0.810 0.745 0.698
1.359 1.215 1.117 1.046
1.813 1.620 1.490 1.395
2.266 2.025 1.862 1.744
0.180 0.168 0.160 0.154
0.360 0.337 0.320 0.307
0.719 0.674 0.640 0.614
1.439 1.348 1.280 1.229
2.158 2.022 1.921 1.843
2.878 2.695 2.561 2.457
3.597 3.369 3.201 3.072
0.027 0.026 0.026 0.025
0.054 0.052 0.051 0.050
0.108 0.105 0.102 0.100
0.217 0.210 0.204 0.200
0.325 0.314 0.307 0.301
0.434 0.419 0.409 0.401
0.542 0.524 0.511 0.501
10.0
0.165
0.331
0.662
0.992
1.323
1.654
0.148
0.297
0.594
1.188
1.781
2.375
2.969
0.025
0.049
0.099
0.197
0.296
0.394
0.493