Data Recording - GE Multilin DDFR Instruction Manual

CHAPTER 1: GETTING STARTED

1.2.2.2 Data Recording

DISTRIBUTED DIGITAL FAULT RECORDER – INSTRUCTION MANUAL
• NERC - RFC-PRC-002-1
• IEEE
• NPCC
• ECAR Doc. #14
The DDFR detects that new information has been recorded in a relay and automatically
retrieves and archives this data. Information that can be archived from protection relays
includes:
• Transient Fault Records
• Sequence of Event Records
• Disturbance Records
Sequence of Event Record (SOE)
The DDFR retrieves the Event Records stored in protection relays distributed across a
substation and merges all of these Events into a Station-Wide Sequence of Event Record.
Connecting the protection relays to an IRIG-B time clock synchronizes the relay internal
clocks with 1 millisecond accuracy and enables the DDFR to create a Station-Wide Event
Record that is an exact representation of the sequence of operations that occurred in the
substation.
Transient Fault Records
Transient Fault Records (also known as Oscillography records) recorded in protection
relays are retrieved by the DDFR and stored in its internal memory space. All Transient
Fault Records are archived using a naming convention that makes it easy for users to
relate the Transient Fault records with a particular substation fault. Each record is stored
with a name that includes the exact date and time at which the record was initially
triggered. If the Transient Fault record was originally recorded in the relay as a COMTRADE
file, the DDFR stores this record in its native format; if the protection relay stores its record
in another format, such as a CSV file, the DDFR automatically converts this file into the
COMTRADE-1999 format so that the record can be analyzed using a standard COMTRADE
viewer.
Disturbance Records
Protection relays capable of recording Disturbance Records used for analyzing extended
or evolving power system disturbances such as Voltage Sags or Swells, are retrieved and
archived by the DDRF. All Disturbance Records are archived using a naming convention
that makes it easy for users to relate the Disturbance records with a particular power
system disturbance. Each record is stored with a name that includes the exact date and
time at which the record was initially triggered. All disturbance records are stored in
COMTRADE format.
Automatic Data Management
The DDFR is equipped with eight gigabytes of internal non-volatile memory that provides
storage for several months of fault and disturbance information inside the DDFR. The data
storage space available is constantly monitored by the DDFR to ensure that adequate
space is available for storing any new data recorded by the protection relays. The DDFR
has an automatic data clearing function that erases older stored data as the DDFR
ABOUT YOUR NEW DDFR UNIT
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