The Arc protection function operates with 9 stages.
Stage 1 (busbar-compartment monitoring):
•
Parameter: Operate & flt.rec. blocked = no
If an arc is detected in the busbar compartment of the infeed, an operate indication is generated immedi-
ately.
•
Parameter: Channel = Arc mod.. 1 channel 1
•
Parameter: Operating mode = current and light
•
Parameter: External trip initiation = no
Stage 2 (CB compartment monitoring):
•
Parameter Operate & flt.rec. blocked = yes
If an arc is detected in the CB compartment of the infeed (light-gray sensors in Figure 7-201), a pickup
indication is generated immediately. The arc is cleared by a superordinate protection device.
•
Parameter: Channel = Arc mod.. 1 channel 2
•
Parameter: Operating mode = current and light
•
Parameter: External trip initiation = no
Stage 3 (cable-connection compartment monitoring):
•
Parameter: Operate & flt.rec. blocked = yes
If an arc is detected in the cable-connection compartment of the infeed (light-gray sensors in
Figure 7-201), a pickup indication is generated immediately. The arc is cleared by a superordinate protec-
tion device.
Depending on the arc location in the cable-connection compartment of the infeed, it is not always
possible to measure the current. If an arc is detected in the cable-connection compartment of the infeed,
the current must be evaluated by the superordinate protection device.
•
Parameter: Channel = Arc mod.. 1 channel 3
•
Parameter: Operating mode = light only
•
Parameter: External trip initiation = no
Stage 4 to 7 (External trip initiation):
•
Parameter: Operate & flt.rec. blocked = no
•
Parameter: Operating mode = current and light
•
Parameter: External trip initiation = yes
If an arc is detected in the busbar compartment or the CB compartment of the feeders, the feeder device
sends the indication
Arc detected
to the infeed device. An external trip initiation via these stages is effec-
tive only if the indication
Arc detected
is connected with the signal
>External Arc
in the infeed device.
The protection device in the infeed evaluates the current. If the measured current exceeds the thresholds
Threshold I> and/or Threshold 3I0>, the protection device in the infeed clears the arc.
Stage 8 and 9 (External trip initiation):
•
Parameter: Operate & flt.rec. blocked = yes
•
Parameter: Operating mode = current and light
•
Parameter: External trip initiation = yes
If an arc is detected in the cable-connection compartment of the feeder, the feeder device sends the indication
Arc detected
to the infeed device. An external trip initiation via these stages is effective only if the indica-
tion
Arc detected
is connected with the signal
>External Arc
in the infeed device.
The protection device in the infeed evaluates the current. If the measured current exceeds the thresholds
Threshold I> and/or Threshold 3I0>, the protection device in the infeed picks up. The pickup indication
Arc detected
will be sent back to the feeder protection device. This makes a selective tripping in the feeder
possible.
Protection and Automation Functions
7.29 Arc Protection
930 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
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