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NVA100X-D - Manual - 02 - 2016
APPENDIX
8 A P P E N D I X
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]
