Woodward HighPROtec MCDLV4, Руководство пользователя

Страница: 514 / 1275

Switchgear/Breaker – Manager
Switchgear Wear Curve
In order to keep the switchgear in good working condition, the switchgear needs to be monitored. The switchgear
health (operation life) depends above all on:
The number of CLOSE/OPEN cycles.
The amplitudes of the interrupting currents.
The frequency that the
switchgear
operates (Operations per hour).
The User has to maintain the switchgear accordingly to the maintenance schedule that is to be provided by the
manufacturer (switchgear operation statistics). By means of up to ten points that the user can replicate the
switchgear wear curve within menu [
Control/SG/SG[x]/SGW]
. Each point has two settings: the interrupt current in
kilo amperes and the allowed operation counts. No matter how many points are used, the operation counts the last
point as zero. The protective relay will interpolate the allowed operations based on the switchgear wear curve.
When the interrupted current is greater than the interrupt current at the last point, the protective relay will assume
zero operation counts.
514 MCDLV4 DOK-HB-MCDLV4-2E
0.1 1 10 100
1
10
100
1 10
3

1 10
4

0.0
10000
1.2
10000
8.0
150
20.0
12
20.0
0
Breaker Maintenance Curve for a typical 25kV Circuit Breaker
N
u
m
b
e
r
of
O
p
e
ra
tio
n
s
Interrupted Current in kA per operation