Siemens 6MD85, Manual

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The following items are considered in the example below:
•
Positioning the optical point sensors in the switchgear
•
Connecting the optical point sensors to the protection devices in the feeders and the infeed
•
Number of necessary stages of the functions in the protection devices of the feeders and the infeed
•
Setting notes about the selected parameters in the stages of the function
[dw_arcprot-extern-input, 3, en_US]
Figure 7-201 Arc Protection with External Trip Initiation
For this example, the following is assumed:
•
Install the optical point sensors in the busbar compartment, the circuit-breaker compartment, and the
cable-connection compartment of the feeder and the infeed. Connect the optical point sensors to the
respective protection device in the feeder and infeed.
•
If the optical point sensors detect an arc in the busbar compartment or the circuit-breaker compartment
of the feeders, the
Light detected
indication is sent via binary inputs/outputs, a protection interface,
or IEC 61850 GOOSE to the protection device in the infeed. Then, the protection device in the infeed
evaluates the current as well. If the measured current exceeds the thresholds
Threshold I>
and/or
Threshold 3I0>
, the protection device in the infeed switches off the malfunction.
You can find detailed information in chapter 7.29.10.2 Application and Setting Notes
•
Arcs in the cable-connection compartment of the feeders can also be switched off selectively by the
protection device of the affected feeder. To do this, the
Current detected
pickup indication from the
infeed unit must be sent to the appropriate protection device in the feeder.
•
If an arc occurs in the circuit-breaker compartment and in the cable-connection compartment of the
infeed, the superordinate protection device trips.
Protection and Automation Functions
7.29 Arc Protection
SIPROTEC 5, High-Voltage Bay Controller, Manual 925
C53000-G5040-C015-9, Edition 11.2017