4. FUNCTIONS DESCRIPTION
GEK-106243E
DTP Digital Transformer Protection
4-3
4.3 ANALYSIS FUNCTIONS
4.3.1 EVENT RECORDER
The DTP equipment keeps a record of the last 166 events and stores the following information: date and time (1
msec. resolution), the type of event, the value of the differential and through currents measured at the time the
event occurred, and the internal states matrix of the unit.
This event recorder is stored in a non-volatile memory and can be maintained indefinitely, even with no power
supply.
The generated events are associated to the internal protection and communication states.
4.3.2 OSCILLOGRAPHY RECORDER
The DTP unit stores up to 4 oscillography registers, with a resolution of 16 samples per cycle. Each register has a
maximum capacity of 66 cycles. The number of pre-fault cycles can be selected from 2 to 10 cycles. Each of the
registers includes the following information:
•
Instantaneous values for current inputs (I
A
, I
B
, I
C
)
•
Digital information: Status of protection functions.
•
Date and time.
•
Causes that generated the oscillographic register.
•
Active settings in the moment of the register.
The causes that can generate the oscillography trigger are the following:
87B phase A Trip
87B phase B Trip
87B phase C Trip
87 phase A Trip
87 phase B Trip
87 phase C Trip
Buchholz Trip
Overtemperature Trip
Input Trigger
Communications Trigger
There is a mask that can be configured (Oscillography Mask Settings Group) and that determines which functions
or internal trips start the oscillography. It also can either be started by a configurable digital input, by
communications or directly from the MMI.
The oscillography registers are retrieved and converted into a COMTRADE IEEE standard format file using the
GE-LOCAL communications program. They can be visualized using the GE-OSC program, or any other program
that accepts the COMTRADE IEEE C37.111-1991 International Standard format or ASCII files (for example
EXCEL
TM
).
Summary of Contents for DTP-B
Page 23: ...3 OPERATING PRINCIPLES 3 6 DTP B Digital Transformer Protection GEK 106243E ...
Page 53: ...10 INSTALLATION AND MAINTENANCE 10 2 DTP B Digital Transformer Protection GEK 106243E ...
Page 68: ...12 FIGURES GEK 106243E DTP Digital Transformer Protection 12 3 Figure 3 RS 232 Connection ...
Page 69: ...12 FIGURES 12 4 DTP B Digital Transformer Protection GEK 106243E Figure 4 Dimensions Diagram ...
Page 70: ...12 FIGURES GEK 106243E DTP Digital Transformer Protection 12 5 Figure 5 Front View ...
