Alstom MiCOM P54 Series - 1.3.18 Circuit breaker fail and pole dead detection function

P54x/EN ST/La4 Settings
(ST) 4-46 MiCOM P543, P544, P545, P546
ST
Setting range
Menu text Default setting Step size
Min. Max.
df/dt>2 Status
(same as stage1)
Enabled Enabled or Disabled N/A
df/dt>3 Status
(sam e as stage 1)
Enabled Enabled or Disabled N/A
df/dt> 4 Status
(same as stage1)
Enabled Enabled or Disabled N/A
1.3.18 C
T ction con a two-stage cir r fai n that c ted
b
 d protection elements


F rote set condit o n n to
d eria
m
I ice to t undercurr nts in l cate
that circuit breaker pol
The Pole Dead detection consists of a two user settable level detectors:
1. Undercurrent
lt) function in TOC protection.
etting
ircuit breaker fail and pole dead detection function
he CB Fail fun sists of cuit breake l functio an be initia
y:
Current base
Voltage based protection elements
External protection elements.
or current-based p ction, the re ion is based n undercurre t operatio
etermine that the CB has opened. For the non-current based protection, the reset crit
ay be selected by means of a setting for determining a CB Failure condition.
t is common pract use low se ent eleme protection re ays to indi
es have interrupted the fault or load current, as required.
2. Undervoltage
The undercurrent setting is shared with CB Fail protection. Both, undercurrent and
undervoltage settings are also used for CNV (Current No Vo
S range
Menu text Default setting
Min. Max.
Step size
CB FAIL & P.DEAD
BREAKER FAIL
CB Fail 1 Status Enabled Enabled or Disabled
Setting to enable or disable the first stage of th ction. e circuit breaker fun
CB Fail 1 Timer 0.2 s 0 s 10 s 0.01 s
Setting for the circuit breaker fail timer stage 1, opening must be during which breaker
detected. There are timers per phase to cope with evolving faults, but the timer setting is
common.
CB Fail 2 Status Disabled Enabled or Disabled
Se to enable or disable the second stage of the circuit breaker function. tting
CB Fail 2 Timer 0.4 s 0 s 10 s 0.01 s
Setting for the circuit br ker fail timer stage 2, opening be
detected.
ea during which breaker must
Volt Prot. Reset
Prot. Reset & < < Only, CB Open & <, Prot. Reset & <
Setting which determines the elements that will reset the circuit breaker fail time for
voltage protection function initiated circuit breaker fail conditions.