Thytronic NV10P, Руководство пользователя

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47 NV10P - Manual - 01 - 2015 CHARACTERISTICS
Example 2
The U
Enp
setting must be adjusted to: U
Enp
= √3 · U
ng
= √3 · 10000 V = 17300 V
Electronic sensor versions
Relay nominal voltage U
n
The voltage sensor is considered equivalent to a VT with (20000 / √ 3) / (100 / √ 3) voltage transfor-
mation ratio.
When the grid rated voltage divided by √ 3 corresponds to the sensors rated primary voltage
(20000 / √ 3), the relay rated voltage
U
n
[1]
should be set to U
n
= 100 V (default setting).
When the grid rated voltage divided by √ 3 is different from the value of rated primary voltage of the
sensors (20000 / √ 3) the relay rated voltage
U
n
is calculated by the following general formula:
U
n
= U
ng
/ K
TV
in the example given below, which corresponds to U
n
= 10 000 / 200 = 50 V.
Relay residual nominal voltage U
En
The rated residual voltage of the relay U
ECn
is automatically calculated by the relay: U
ECn
= √3∙ U
n
Example
As per the above example U
n
= 100 V. The relay will automatically calculate:
U
ECn
= U
n
∙ √3 = 100 ∙ √3 = 173 V
If the threshold required is expressed in primary Volts the setting is calculated by the following gen-
eral formula:
U
E>>def
= threshold / ( U
ng
/√3); e.g. U
ng
= 20 000 and threshold 59N = 577 V (primary):
U
E>>def
= 577 / (20 000 / √3 = 0.05 U
ECn
Measurement reading mode
Measures may be displayed according the following operating modes:
- With
RELATIVE
setting all measures are related to the nominal value,
- With
PRIMARY
setting all measures are related to the primary value.
Note 1 U
n
represents the reference value to which all the adjustments are expressed
•
•
•
K
VT
=
/ V
V
11000 3
3
100
= 110 /
K
VT
=
/ V
V
11000 3
3 Relay nominal voltage U
n
= 91 V
100
= 110 /
NV10P
U
ng
= 10 kV
U
En
= 91 V
Grid nominal voltage U
ng
= 10 kV
VTs ratio:
K
VT
=
/ V
V
11000 3
3
100
= 110 /
K
VT
=
/ V
V
11000 3
3 Relay nominal voltage U
n
= 91 V
100
= 110 /
NV10P
U
ng
= 10 kV
U
En
= 91 V
Grid nominal voltage U
ng
= 10 kV
VTs ratio:
U
ng
= 20 kV
52
NV10P
K
TV
= 200
U
n
= 100 V
Grid nominal voltage U
ng
= 20 kV
Ratio of voltage sensors: K
TV
= U
np
/ U
ns
= (20000 / √3) / (100 / √3) = 200
U
ng
= 20 kV
52
NV10P
K
TV
= 200
U
n
= 100 V
Grid nominal voltage U
ng
= 20 kV
Ratio of voltage sensors: K
TV
= U
np
/ U
ns
= (20000 / √3) / (100 / √3) = 200
K
TV
= 200
U
ng
= 10 kV
U
n
= 50 V
52
NV10P
Grid nominal voltage U
ng
= 10 kV
Ratio of voltage sensors: K
TV
= U
np
/ U
ns
= (20000 / √3) / (100 / √3) = 200
K
TV
= 200
U
ng
= 10 kV
U
n
= 50 V
52
NV10P
Grid nominal voltage U
ng
= 10 kV
Ratio of voltage sensors: K
TV
= U
np
/ U
ns
= (20000 / √3) / (100 / √3) = 200
U
ng
= 20 kV
52
K
TV
= 200
U
n
= 100 V
U
ECn
= 173 V
NV10P
Grid nominal voltage U
ng
= 20 kV
Ratio of voltage sensors: K
TV
= U
np
/ U
ns
= (20000 / √3) / (100 / √3) = 200
U
ng
= 20 kV
52
K
TV
= 200
U
n
= 100 V
U
ECn
= 173 V
NV10P
Grid nominal voltage U
ng
= 20 kV
Ratio of voltage sensors: K
TV
= U
np
/ U
ns
= (20000 / √3) / (100 / √3) = 200