smfl-86150ks Samwha Electric Co., Ltd., smfl-86150ks Datasheet - Page 17

• Manufacturer Part Number: smfl-86150ks
• Description: A.c. Harmonic Filter
• Manufacturer: Samwha Electric Co., Ltd.

Samwha
Samwha 44
〉
* A pproximate Dimensions are give above. Please contact factory for exact deimensions of a particular
〉
In 3 phase circuit, for 1 line grounding current is calculated from the following formula.
lg = 3jωCEa = j 3E×2πfC
Ig : Grounding Current [A]
Ea : Phase Voltage [V]
I
passes the zero phase current transformer. Therefore, ground fault current Ig
calculated from the following formula.
Ig
When the distance between transformer and ZCT is small, ground capacity in line is small and
penetration ground fault current I
earthing to improve ground capacity in line.
For example, when E = 3300V, C
is as following :
Ig
Since detecting current of grounding breaker is selected to be 0.1 ~ 0.8A, it is good to select the value
of C
[C
selected]
C1
1
1
capacitor
[Ground fault current Ig in figure A - charged current after zero phase current transformer [ZCT]]
1
=
= 3×3300×2π×60×0.5×10
is equivalent to 1 phase and in case of C
Ratings and Dimensions
Operation Principle
1
to be more than this value
Line Voltage [V]
3E×2π×f×
√
√
3300
6600
√
Grounding Capacitor
C
Grounding Transformer
1
Grounding Transformer
Creative TEchnology Provider
4-10 Grounding Capacitor
Rated Capacity [kvar]
E : Line Voltage [V]
C : Equivalent Ground Capacitance [C = C
1
-6
g1
= 0.5㎌, and f = 50Hz in figure B, ZCT penetration ground fault current
= 1.08A
is not enough to move circuit breaker. Therefore, use capacitor for
10
10
1
= 0.5㎌, capacitor for grounding of 0.5㎌×3 is to be
TBF-T36010Y
TBF-T66010Y
Type
Grounding Accident
1
+C
2
]
1
passing ZCT can be
490
290
Dimension [mm]
A
675
475
B