
428
6
F
2
S
0
8
5
0
2.6 Impedance setting
Element
Standard setting (Recommended)
Setting
Z1S
80% of protected line reactance
80%
Z2S
120% or more of protected line reactance
130%
Z3S
100% of protected line impedance plus 150%
of next line section
300%
Z3S
θ
Line angle setting (Note *1)
Z4S
120% of Z3S
120% of Z3S setting
Z1G
75% - 80% of protected line reactance
75%
Z2G
120% or more of protected line reactance
130%
Z3G
400% - 600% of protected line impedance
500%
Z3G
θ
Line angle setting (Note *1)
Z4G
120% of Z3G
120% of Z3G setting
PSBSZ
2 ohms (5A rating)
2 ohms
PSBGZ
2 ohms (5A rating)
2 ohms
Step 1
Calculate the setting impedance from the given recommended reach point table.
Step 2
Multiply the actual impedance by the factor “k” to calculate the relay impedance:
Relay impedance = k
×
Actual impedance
Factor “k” is calculated as follows:
K = (CT ratio)/(VT ratio) = (600/5A)/((150kV/ 3 )/(110V)/ 3 )) = 0.088
Note *1:
Z3S
θ
and Z3G
θ
line angle settings are applicable if [ZS-C] and [ZG-C] are set to
“Mho”.
Line angle
θ
= tan
-1
(0.2747/0.0197) = 85.9
°
The line angle setting is set to 85
°
. Alternatively set to a smaller angle (e.g. 80
°
) in consideration
of higher levels of fault resistance.
<Z1S, Z2S, Z3S, Z4S, Z1G, Z2G element>
Z1S, Z2S, Z3S, Z4S, Z1G, Z2G element settings are calculated as shown in the following table.
<Z3G, Z4G element>
Zero sequence current compensation is not applied to Z3 or Z4. Z3G and Z4G settings should be
larger than the calculated values because of the underreaching effect without zero sequence
current compensation.
a. Setting condition of Z3G element:
The Z3G element must operate on all faults for which the Z2G element operates.
(lower setting limit: Z3G > Z2G)
The Z3G element must not operate on load current. (upper setting limit), so:
X3G setting = [Zline
×
130%](Z2G setting)
×
2.6(operating margin for no zero phase
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Содержание GRL100-701B
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Страница 290: ... 289 6 F 2 S 0 8 5 0 Appendix B Signal List w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 324: ... 323 6 F 2 S 0 8 5 0 Appendix C Variable Timer List w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 348: ... 347 6 F 2 S 0 8 5 0 Appendix G Typical External Connection w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 388: ... 387 6 F 2 S 0 8 5 0 Appendix J Return Repair Form w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 394: ... 393 6 F 2 S 0 8 5 0 Appendix K Technical Data w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 410: ... 409 6 F 2 S 0 8 5 0 Appendix L Symbols Used in Scheme Logic w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 414: ... 413 6 F 2 S 0 8 5 0 Appendix M Multi phase Autoreclose w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 418: ... 417 6 F 2 S 0 8 5 0 Appendix N Data Transmission Format w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 424: ... 423 6 F 2 S 0 8 5 0 Appendix O Example of Setting w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
Страница 440: ... 439 6 F 2 S 0 8 5 0 Appendix Q IEC60870 5 103 Interoperability w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 454: ... 453 6 F 2 S 0 8 5 0 Appendix R Inverse Time Characteristics w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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Страница 468: ... 467 6 F 2 S 0 8 5 0 Appendix U Ordering w w w E l e c t r i c a l P a r t M a n u a l s c o m ...
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