marcolao said:
Hi, I
got a problem and seeking for help, could anyone do me a favor.
The
power supply of network data centre is supplied by a UPS. The UPS’s output
connects to 2 nos. of 800A MCCB individually. And the circuits are protected by:
( Form
>> to )
A) 800A MCCB >>
100A MCCB >> 100A AI switch >>
( circuit 1 & 2 )
1) 63A Type C MCB >>
63A AI switch >> 32A RCBO
>> Power socket
2) 63A Type B MCB >>
Floor box (40A RCCB + Power socket)
B) 800A MCCB >>
100A MCCB >> 100A AI switch >>
63A Type B MCB >> Floor box (40A RCCB + Power socket)
The case is that, a fault occurred at data server that
supply by the power socket of circuit A(1). The 32A RCBO was
tripped. When I tried to reset the RCBO, it tripped again immediately. At the
mean time, an unpredictable scenario was happened. Some RCCB (around 6 nos.) at circuit A(2) and circuit B were tripped at
the same time immediately. That caused around 7 nos. of servers were downed. Could
anyone do me a favor to give a hint? Thanks you so much.
No MCCB or MCB was tripped, only the the RCCBs were
affected. That caused around 7 nos. of servers downed. Finally, a fault
equipment at circuit A(1) had been isolated, and all circuits had been reset.
My question is that ;
1) Why the other RCCBs at the final circuit of the
separated circuits were tripped during I reset aforesaid RCBO?
2) How the fault affect separated circuits?