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NVA100X-D - Manual - 02 - 2016
APPENDIX
8 APPENDIX
8.1 APPENDIX A1 - Inverse time curves
The operate characteristic of the protective elements is shown in the table:
ANSI code Element DEFINITE CUSTOM
IEC
type A
SI
IEC
type B
VI
IEC
type C
EI
IEC
type B
LIT
IEEE
type
MI
IEEE
type
VI
IEEE
type
EI
RECTIFIER I2t EM
21 Underimpedance
27 Undervoltage
U<
[1]
27V1 Positive sequence undervoltage
32P Directional active overpower
37 Undercurrent
37P Directional active underpower
40 Loss of field
46M Negative sequence overcurrent for Motor
46G Negative seq. overcurrent for Generator
I2>>
[2]
47 Phase reversal
49MG Thermal image for Motor / Generator
50/51 Phase overcurrent side H
I>
[3]
50/51 Phase overcurrent side L
I>
[3]
50N.1/51.1N Residual overcurrent side 1
50N.2/51.2N Residual overcurrent side 2
50N/51N(Comp) Calculated residual overcurrent
51LR(48)/14 Locked rotor
ILR>
[5]
51V Voltage restraint overcurrent
55 Minimum power factor
59 Overvoltage
U>
[6]
59N Residual overvoltage
UE>
[6]
59V2 Negative sequence overvoltage
64REF Low impedance restricted earth fault
66 Maximum number of startings
67N Ground directional overcurrent
67N(Comp)
Ground directional overcurrent -
(calculated residual current)
67N(Comp) Ground directional overcurrent
87NHIZ.1 High impedance restricted earth fault
87NHIZ.2 High impedance restricted earth fault
81O Overfrequency
81U Underfrequency
87G-87M-87T Differential for Generator-Motor-Transformer
BF Circuit breaker failure
74CT(H) CT monitoring - side H
74CT(L) CT monitoring - side L
74VT VT monitoring
74TCS Trip circuit supervision
Note 1 First element: t = 0.75 t
U<inv
/ [1-(U/U
<inv
)]
Note 2 Second element, I2t: t =K
heat
/(I
2
/I
B
)
2
(con I
2
≥ I
2
>> and t
2min
≤ t ≤ t
2max
)
Note 3 First element: 50/51, t = 2351 · t>
inv
/ [(I/I>
inv
)
5.6
- 1], fi rst and second element 67, t = 2351 · t
PD
>
inv
/ [(I/I
PD
>
inv
)
5.6
- 1]
Note 4 First element, CAPACITOR: t = t>
inv
· {50000 / [1.1 · (I
RMS
/I>
inv
)
17
-1]} + 0.1
Note 5 First element, t = (I
MOT-ST
/ I)
2
∙ t
LR>inv
with I greater than I
LR
>
inv
Note 6 First element 59, t = 0.5 t
U
>
inv
/ [(U/U>
inv
) - 1] and First element 59N, t = 0.5 t
UE
> / [(U
E
/U
E
>
inv
) - 1]
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