Shihlin electric BW-2000, Руководство пользователя

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ACB-OB
9
INSTR
UC
TIONS
3.2.6 Phase Failure Protection Characteristics
Phase failure protection provides protection for phase failure according to the present three-phase current
imbalance rate. The current imbalance rate equation is shown below.
δ=| I-I
av
|/I
av
In the equation
：
I
av
is the average of three-phase current.
The feature of phase failure protection is fixed time protection. The delay setting value is
t
δ
. If the setting is "OFF",
the phase failure protection function is off.
Technical parameters of phase failure protection characteristics of the controllers are listed in Table 6.
3.2.7 Other Functions
Test functions
The controller uses the instantaneous mode to simulate tripping for testing. After the test, tripping action will be
generated. This test is used for coordinating the controller with the circuit breaker for onsite-tripping tests, routine
check, or repairing and checking the coordination between the controller and the circuit breaker. Press the red
restore button on the panel of the controller before closing the circuit breaker for starting the operation. Do not
use it during normal operation.
Fault record functions
If there is any controller fault (either tripping or self-diagnosed faults), all relevant conditions and data of the fault
will be recorded. After restarting after a fault or power failure, fault memory function is still available and can keep
ten latest fault cases for later analysis. Concrete query methods are presented in 8.2.3.
The tripping type of faults include overload, short-circuit, sudden tripping, earthing/leakage (optional), and phase
failure.
Self-diagnosed faults include overheated, worn contact, and failure to trip.
Table 6. Technical Parameters of Phase Failure Protection Characteristics
The controller can program the output of two passive signal contacts for load monitoring. The output signal
contacts can be used for monitoring alerts, controlling the load of tripping sub-circuit and ensuring a normal
power supply for the main system. There are two types of load monitoring methods available (the user can choose
one of them).
1. Method 1: It can be used to control two sub-circuit loads. When the working current exceeds 1.2Ic1 or 1.2Ic2, controller will
delay the output of signal contacts according to inverse time characteristics. The characteristic curve of inverse
time and the characteristic curve of overload long-delay are the same, but the setting current value can be set
independently.
2. Method 2: It is generally used to control sub-circuit loads. When the working current exceeds 1.2Ic1, the controller will output
signal contact point break sub-circuit load according to inverse time characteristics. The characteristic curve of
inverse time and the characteristic curve of overload long-delay are the same, but the setting value has to be
Ic1 ≥ Ic2. If after tripping the sub-circuit load, the current will return to normal. When the current is lower than Ic2
for 60s continuously, the controller will output another signal contact to pick up the broken load and restore the
power supply of system.
δ=
Time delay setting value
t
δ
(s)
Tripped at 0.9-1.1
δ
Definite time
90%~99% + OFF(OFF means that the function has been turned off )
Operation
characteristics
Tripping time
1 ~ 40 s
Phase failure
protection
setting value