Busbar Vt Fail (60Vtf-Bus) - 7Sr22; Figure 5.2-1 Logic Diagram: Vt Supervision Function (60Vts) - Siemens Argus 7SR21 Technical Manual

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60VTS Element

60VTS Inhibit

1 or 2 Phase Fail

60VTS Ext_Trig

60VTS Ext_Reset

Busbar VT Fail (60VTF-Bus) – 7SR22

When the optional synchronising function is fitted, the synchronising voltage transformer is utilised to provide an

additional monitoring function to check the validity of the measured line and busbar voltages. When the circuit

breaker is closed, both voltages should be either Live or Dead. If the Bus voltage indicates that the VT is Dead

but the corresponding Line voltage is Live, this raises the Bus VT Fail output. A time delay setting is provided to

avoid spurious operations during transient switching conditions. Additionally, this output can be enabled by a

setting, 79 LO Bus VT Fail, to apply a Lockout signal to the autoreclose function so that a sequence will not be

attempted after a trip occurs if it is known that the voltage measurement is not reliable. A similar setting is

available, 79 LO Line VT Fail, which when Enabled will provide a Lockout for a Line VT failure detected by the

60VTS function.

3 Phase Fail

Vpps Setting

7SR210 & 7SR220 Description of Operation

60VTS Pick-Up

60VTS Operated

Page 79 of 94

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