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This function detects voltage presence (setting 1.3.) in one or both sides of the side breaker. It can be
used for conditioning the undervoltage trip to voltage presence. This allows the breaker to close when there is no
voltage (voltage absence) avoiding an undervoltage trip afterwards.
This function detects weak infeed condition (setting 1.4) on line phase A (V3).
This function detects weak infeed condition (setting 1.4) on line phase B (V4).
This function detects weak infeed condition (setting 1.4) on line phase C (V5).
The MOV2 includes different settings for closing and reclosing permissions. It also includes different
masks for permissions in the case of DL-DB, LL-DB. DL-LB and/or Synchronism during a selectable period of time
(settings 3.4, and 3.5). In order to verify the synchronism between both sides of the side breaker, the unit checks
that the difference in module, phase, and frequency of voltage values V1, and V2 (when the line selector switch is
open), or V1, and V4 (when the line selector switch is closed) are smaller than settings 3.1, 3.2, and 3.3.
The synchronism check function only operates for LL-LB conditions, that is, when voltage on both sides of
the breaker is equal or higher than the voltage presence setting (setting 1.3). Once this condition is present,
voltage must fall below the voltage absence setting (setting 1.4) in order to become a Dead Line or Dead Bus
situation.
For this breaker, the BUS side refers to the voltage value independent from the line 89, that is, V1. The
LINE side refers to voltage values V4 or V2, depending on the status of 89.
The MOV2 includes different settings for closing and reclosing permission. It also includes
different masks for permissions in the case of DL-DB, LL-DB. DL-LB and/or Synchronism during a selectable
period of time (settings 3.4, and 3.5). In order to verify the synchronism between both sides of the central breaker,
the unit checks that the difference in module, phase, and frequency of voltage values V1, and V2 (when the line
selector switch is open), or V1, and V4 (when the line selector switch is closed) are smaller than settings 4.1, 4.2,
and 4.3.
The synchronism check function only operates for LL-LB conditions, that is, when voltage on both sides of
the breaker is equal or higher than the voltage presence setting (setting 1.3). Once this condition is present,
voltage must fall below the voltage absence setting (setting 1.4) in order to become a Dead Line or Dead Bus
situation.
GEK-106271
= V1 + V2 * 89 + (V3 + V4 + V5) * 89
= V3
= V4
= V5
MIV Digital Multifunctional Protective Relay
2. OPERATION PRINCIPLES
2.1.12. FUNCTION 25 FOR THE SIDE 52 (521)
2.1.13. FUNCTION 25 FOR CENTRAL 52 (520)
2.1.8. FUNCTION - J
2.1.9. FUNCTION - G
2.1.10. FUNCTION - H
2.1.11. FUNCTION - I
9
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