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2.11 OSCILLOGRAPHY (AVAILABLE IN OPTION 1 AND OPTION 2 MODELS)
2.11OSCILLOGRAPHY (AVAILABLE IN OPTION 1 AND OPTION 2 MODELS)
MIFII1000/3000 stores an oscillography record, with a resolution of 8 samples per cycle with a length of 24 cycles
(including 2 pre-fault cycles), with the following information:
Instantaneous values ofphase (Ia, Ib, Ic) and ground (I
•
Digital information:
•Pickups (protection functions
2
•Trip inhibition by digital input (protection functions
•Trips (protection functions
•Ready (protection in service)
•Auxiliary digital outputs
•Digital inputs
•Breaker 52A, Breaker 52B, (status of the digital inputs)
•Status 52 (status of the circuit breaker) (only OPTION 2 models)
•Breaker opening failure (only OPTION 2 models)
2
•I
alarm (only OPTION 2 models)
•Cold load pickup (only OPTION 2 models)
•Group 2 selection by digital input
•EEPROM failure
•Default settings/User settings
•
Date and time
•
Model
•
Number of oscillo
•
Value of the differential Ia, Ib, Ic and Ig currents at the moment of the oscillography trigger
•
Active group at the moment of the oscillography trigger
•
Element settings when retrieving the oscillography record.
•
Oscillography and event mask
•
File to emulate the relay model in PC program, with the relay settings and memory map
The number of oscillo is a circular counter that increases with each generated oscillography. This value appears on the
relay status and is used only for informative purposes.
The oscillography record is stored in a capacitor backed up RAM memory.
MIFII functionality related to oscillography is performed from the ENERVISTA MII SETUP program. The oscillography
record obtained is stored on the PC in a COMTRADE-IEEE C37.111-1991 format.
There are four possible causes that can produce an oscillography trigger:
1.
Pickup of one of the protection functions
2.
Trip of one of the protection functions
3.
Oscillography trigger by communications
4.
Oscillography trigger by digital input
1.
2.
3.
2-18
1
)
3
)
Protection functions: 50P1, 50P2, 50G1, 50G2, 51P, 51G, 49, general
Protection functions: 50P1, 50P2, 50G1, 50G2, 51P, 51G, 49, general
Protection functions: 50P1, 50P2, 50G1, 50G2, 51P, 51G, 49, general
MIFII Digital Feeder Relay
) currents. The 2 first cycles are pre-fault cycles.
g
2
)
2 PRODUCT DESCRIPTION
GEK-106237P
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