GE DS200TCEAG2B Vector signal transceiver

(To prevent the LV circuit-breaker from being opened by the protection, it is possible to set to “Off” the “trip enable” of Gext function). The reference event is chosen as “Gext alarm (blocked trip)” so that such signal is maintained for all the duration time of the fault up to its extinction; besides, the contact shall be duly delayed to give the internal protection G (Gint) the time to trip, in case the fault occurs on the load side of the main LV circuit-breaker. To guarantee the correct setting of K51/p1 contact, it is possible to use PR010/T test and signaling unit or the software SD-Pocket (for PDA) and SD-TestBus (for PC). As an example, the following Figure shows the main window of PR120/K module as it appears in the program SD-TestBus

For further information 

on the function “double G”, available on the trip units type PR123/LSIG and PR333/LSIG, reference must be made to other ABB technical documents. The programmable contact shall be put in series with the opening coil of the MV circuit-breaker as previously pointed out. As a consequence, the correct sequence of the events is the following: • a fault occurs on the supply side of the main LV circuit-breaker; - the Gext protection is activated by the fault current flowing through the toroid; - the K51/p1 contact changes its status moving to closed position; - the opening coil of the MV circuit-breaker is energized, thus being opened;

• a fault occurs on the load side of the main LV circuit-breaker

- the Gext protection is activated by the fault current flowing through the toroid; - also the Gint protection is activated by the fault current equal to the resultant of the currents flowing through the active conductors (phases plus neutral); - the Gint protection, being set so as to be faster than the Gext protection, causes the opening of the main LV circuit-breaker; - the K51/p1 contact does not change status and consequently does not energize the opening coil of the MV circuit-breaker, which remains in closed position.

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----------------------Ruichang Mingsheng Automation Equipment Co., Ltd----------------------

PLC module, programmable controller, CPU module, IO module, DO module, AI module, DI module

Network communication module,

Ethernet module, motion control module, analog input module, analog output module, digital input module, digital output

Module, redundancy module, power module, relay output module, relay input module, processor module