Manual WIP1 GB
Woodward
DOK-TD-WIP1 Rev.F
15
4.1.2 Analog inputs
The protection unit WIP1 receives the analog input signals of the phase currents I
L1
(1S1 - 1S2),
I
L2
(2S1 - 2S2) and I
L3
(3S1 - 3S2) for phase current, earth current and negative sequence measuring. The
measured current values are analogously filtered and fed to the analog/digital converter.
4.1.3 Control inputs
Input remote tripping
The remote tripping input (terminals 20 and 22) enables tripping by an external voltage pulse, e.g. from a
thermal overcurrent tripping device, Buchholz protection or other external trip commands. By bypassing the
measuring circuits, this input (230 V AC max. 5 min) has a direct effect on the trip circuit. The input terminals
are galvanically decoupled from the relay electronics.
Signal inputs
Signal inputs for blocking and protection (terminals 14 and 17) for fast trip (terminals 32 and 33) as well as
external reset (terminals 14 and 15) can be activated by applying an external voltage.
Blocking function (terminals 14 and 17):
Single or all trip elements can either be blocked or re-leased.
Fast trip (terminals 32 and 33):
By this function the CB can be tripped instantaneously. There are two different kind of trippings:
Instantaneous
means, a trip is initiated as soon as the minimum current is available (lowest power supply
value adjustable).
After activation
means, the high-speed tripping function only is activated if one of the phase currents ex-
ceeds the set value.
The fast trip input can be applied for e.g. arcing fault detectors.
Reset
After a trip event the alarm relay is reset and the LED extinguishes when voltage is applied (see also chapter
5.9).
