20
6
F
2
S
0
7
5
7
Two independent elements ZPS1 and ZPS2 are provided and are programmable for definite time
delayed or inverse time delayed (IDMT) operation.
The inverse time characteristic is defined by equation (3).
( )
+
−
×
=
c
Vs
V
k
TMS
t
a
1
0
(3)
where:
t = operating time for constant voltage V
0
(seconds),
V
0
= Zero sequence voltage (V),
Vs = Zero sequence overvoltage setting (V),
TMS = time multiplier setting.
k,
α
, c = constants defining curve.
The standard IDMT characteristic is illustrated in Figure 2.3.3.
ZPS Overvoltage Inverse Time
Curves
0.010
0.100
1.000
10.000
100.000
1000.000
0
5
10
15
20
Applied Voltage (x Vs)
Operating Time (secs)
TMS = 10
TMS = 5
TMS = 2
TMS = 1
Figure 2.3.3 IDMT Characteristic of ZPS
Summary of Contents for GRD130-210
Page 112: ... 111 6 F 2 S 0 7 5 7 Appendix A Signal List ...
Page 116: ... 115 6 F 2 S 0 7 5 7 Appendix B Event Record Items ...
Page 120: ... 119 6 F 2 S 0 7 5 7 Appendix C Binary Output Default Setting List ...
Page 122: ... 121 6 F 2 S 0 7 5 7 Appendix D Details of Relay Menu ...
Page 134: ... 133 6 F 2 S 0 7 5 7 Appendix E Case Outline ...
Page 136: ... 135 6 F 2 S 0 7 5 7 Appendix F Typical External Connection ...
Page 151: ... 150 6 F 2 S 0 7 5 7 ...
Page 156: ... 155 6 F 2 S 0 7 5 7 Appendix I Return Repair Form ...
Page 160: ... 159 6 F 2 S 0 7 5 7 Customer Name Company Name Address Telephone No Facsimile No Signature ...
Page 161: ... 160 6 F 2 S 0 7 5 7 ...
Page 162: ... 161 6 F 2 S 0 7 5 7 Appendix J Technical Data ...
Page 167: ... 166 6 F 2 S 0 7 5 7 ...
Page 168: ... 167 6 F 2 S 0 7 5 7 Appendix K Symbols Used in Scheme Logic ...
Page 171: ... 170 6 F 2 S 0 7 5 7 ...
Page 172: ... 171 6 F 2 S 0 7 5 7 Appendix L IEC60870 5 103 Interoperability ...
Page 180: ... 179 6 F 2 S 0 7 5 7 Appendix M Ordering ...
Page 183: ......