Siemens 6MD85, Manual

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NOTE
When the function or device is in test mode, all indications are given a test bit.
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NOTE
In the mode Device in test mode, the operate indications generated by the function operate the binary
outputs.
The function must also be tested in its normal, switched-on condition.
Consider the following in this case:
²
The device contacts are actuated.
²
Binary input signal supervision (in the case of an external start) is enabled and blocks the function.
²
All indications generated are generated without test bit.
Circuit-Breaker Auxiliary Contacts
When circuit-breaker auxiliary contacts are connected to the device, they make an essential contribution to the
reliability of the circuit-breaker failure protection, provided that their settings are set accordingly.
²
Make sure that the correct assignment has been checked.
Internal Starting Conditions (Trip Command from Internal Protection Function)
The internal start can be tested by means of tripping a protection function, for example, the main protection
function of the device.
²
Check how the settings of the circuit-breaker failure protection are set. Refer also to the chapter Applica-
tion and Setting Notes.
²
For the circuit-breaker failure protection to be able to pick up, a phase current (see current-flow criterion)
must be present. This can be generated by a device-internal test sequence (see description in the Oper-
ating manual). It can also be a secondary test current.
²
Generate the trip for the protection function. This can be generated within the device by a test sequence
(see description in the Operating manual) or by creating corresponding secondary test values.
²
The trip command(s) and their time delay compared to the pickup, depending on the parameterization.
External Starting Conditions (Trip Command from External Protection Function)
If external protection devices are also able to start the circuit-breaker failure protection, the external starting
conditions require checking.
²
Check how the settings of the circuit-breaker failure protection are set.
Refer also to the chapter Application and Setting Notes.
²
For the circuit-breaker failure protection to be able to pick up, a phase current (see current-flow criterion)
must be present. This can be generated by a device-internal test sequence (see description in the Oper-
ating manual). It can also be a secondary test current.
²
Activate the binary input or inputs to which the start signal and possibly also the release signal for the
CBFP function are routed. This can be done in 2 ways:
– 1) Via internal test sequences
– 2) By controlling the binary input or inputs via an auxiliary voltage
²
Check the start input signal, and if available, check the enable input signal in the spontaneous or fault
messages.
²
Check the pickup indication in spontaneous or fault indications.
²
The trip command(s) and their time delay compared to the pickup, depending on the parameterization.
Functional Tests
10.3 Primary and Secondary Tests of the Circuit-Breaker Failure Protection
1064 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017