Shihlin electric BA Series User Manual

ACB-I
9
A I R C I R C U I T B R E A K E R
It is just available one between earth fault protection and leakage protection.
There are two styles of above two protections:
1. Inverse time protection: T
G
=
t
G
x K
G
x I
f
/ I
In the expression: T
G
denes as delay actuation time of actual protection
t
G
denes as setting value of denite time delay
K
G
denes as coecient value of inverse time
I
f
denes as setting current value
I d
enes as real working current
Delay actuation time of inverse time protection could be obtained from above expression, but it is greater than or equal
to setting value of denite time delay. It is denite time protection when KG is in OFF position.
2. Denite time protection: delay actuation time of denite time protection is denite time delay setting value.
Single earthing protection is a kind of m
etallic protection when fault current exceeds several hundreds ampere, which
generally applied to neutral –point directly earthing system. There are two kinds of protection modes for the controller:
One is vector sum mode of internal transformer (earthing protection). The controller"s operating apply to vector sum of
the three-phase current and neutral current, according to the numbers of poles of
breaker, there are three forms: 3PT, 4PT,
(3P+N) T. This mode widely used for balance overload, unbalanced overload and motor overload systems with alarming
no tripping.
Another is transformer mode of external leakage. The controller gets the output current signal from a current transformer
directly to protect. Generally, the secondary output of the transformer is 5A/1A (secondary current is 1A if
primary current
of transformer is less than 400A, else is 5A). This mode has higher sensibility especially applied to protect earth fault
whose current is smaller beginning from tens of amperes. There are two methods of ground signal"s sampling. One is
rectangular transformer sampling mode (shown as follow Mode1, Model 2). Another is ring transformer sampling mode
in which the transformer"s diamet
er is 100MM (Mode 3 for reference)
PEN
N
PE
N
PE
PE或PEN
ZCTZCT
ZCT
N
N
PE
intelligent
controller
intelligent
controller
intelligent
controller
intelligent
controller
intelligent
controller
intelligent
controller
Mode 1 External transformer
The transformer is ZCT1.
Mode 2 External transformer
The transformer is ZCT1.
Mode 3 External transformer
The transformer is ZCT100.
3PT 4PT 3P+N
PEN
N
PE
N
PE
PE或PEN
ZCTZCT
ZCT
N
N
PE
intelligent
controller
intelligent
controller
intelligent
controller
intelligent
controller
intelligent
controller
intelligent
controller
Mode 1 External transformer
The transformer is ZCT1.
Mode 2 External transformer
The transformer is ZCT1.
Mode 3 External transformer
The transformer is ZCT100.
3PT 4PT 3P+N

Shihlin electric BA Series Specifications

General

Brand	Shihlin electric
Model	BA Series
Category	Circuit breakers
Language	English