Siemens 6MD86 - Application and Setting Notes

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The optical point sensors in the cable-connection compartment of the feeders detect arcs in this compart-
ment. Install one optical point sensor in the cable-connection compartment of the feeders and connect it
to the protection device of the feeder. This allows for the selective clearing of arcs inside the cable-
connection compartment.
Due to the pressure waves that occur during the formation of an arc, partitions can deform and cause
undesirable light influences in adjacent compartments. This can result in a non-selective tripping.
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If there is an arc in the circuit-breaker compartment and in the cable-connection compartment of the
infeed, the superordinate protection device must switch off.
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NOTE
If the Arc protection function operates in Operating mode = light only, the effects of external light
can result in non-selective tripping.
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NOTE
It must be considered that the number of arc protection modules connected to the device depends on the
hardware configuration of the device.
When using modular devices, a maximum of 15 sensors can be connected. If using non-modular devices, a
maximum of 6 sensors (3 sensors per module) can be connected.
Application and Setting Notes
General Notes
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Connect one optical point sensor from the cable-connection compartment in feeder 1 to the protection
device in feeder 1. Arcs in the cable-connection compartment are cleared selectively by the circuit
breaker in feeder 1.
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Connect one optical point sensor from the cable-connection compartment in feeder 2 to the protection
device in feeder 2. Arcs in the cable-connection are cleared selectively by the circuit breaker in feeder 2.
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Connect optical point sensors from all busbar compartments and all circuit-breaker compartments of
feeders 1 and 2 to the protection device in the infeed. Arcs in these compartments are detected and
cleared by the device in the infeed.
Setting Notes for the Protection Device in Feeder 1
The Arc protection function operates with one stage.
Set the parameters of the stage as follows:
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Parameter: Operating mode = light only
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Parameter: Sensor = point sensor
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Parameter: External trip initiation = no
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Parameter: Channel = Arc mod. 1 channel 1
The parameters in block General are not relevant since the Operating mode = light only.
Setting Notes for the Protection Device in Feeder 2
The Arc protection function operates with one stage.
Set the parameters of the stage as follows:
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Parameter: Operating mode = light only
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Parameter: Sensor = point sensor
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Parameter: External trip initiation = no
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Parameter: Channel = Arc mod. 1 channel 1
7.29.8.2
Protection and Automation Functions
7.29 Arc Protection
SIPROTEC 5, High-Voltage Bay Controller, Manual 921
C53000-G5040-C015-9, Edition 11.2017