GE Multilin G30 Generator Protection System 5-39
5 SETTINGS 5.2 PRODUCT SETUP
5
The DNP UNSOL RESPONSE FUNCTION should be “Disabled” for RS485 applications since there is no collision avoidance
mechanism. The DNP UNSOL RESPONSE TIMEOUT sets the time the G30 waits for a DNP master to confirm an unsolicited
response. The DNP UNSOL RESPONSE MAX RETRIES setting determines the number of times the G30 retransmits an unsolic-
ited response without receiving confirmation from the master; a value of “255” allows infinite re-tries. The
DNP UNSOL
RESPONSE DEST ADDRESS is the DNP address to which all unsolicited responses are sent. The IP address to which solicited
responses are sent is determined by the G30 from the current TCP connection or the most recent UDP message.
The DNP scale factor settings are numbers used to scale analog input point values. These settings group the G30 analog
input data into the following types: current, voltage, power, energy, power factor, and other. Each setting represents the
scale factor for all analog input points of that type. For example, if the
DNP VOLTAGE SCALE FACTOR setting is set to “1000”,
all DNP analog input points that are voltages will be returned with values 1000 times smaller (for example, a value of 72000
V on the G30 will be returned as 72). These settings are useful when analog input values must be adjusted to fit within cer-
tain ranges in DNP masters. Note that a scale factor of 0.1 is equivalent to a multiplier of 10 (that is, the value will be 10
times larger).
The
DNP DEFAULT DEADBAND settings determine when to trigger unsolicited responses containing analog input data. These
settings group the G30 analog input data into the following types: current, voltage, power, energy, power factor, and other.
Each setting represents the default deadband value for all analog input points of that type. For example, to trigger unsolic-
ited responses from the G30 when any current values change by 15 A, the
DNP CURRENT DEFAULT DEADBAND setting
should be set to “15”. Note that these settings are the deadband default values. DNP object 34 points can be used to
change deadband values, from the default, for each individual DNP analog input point. For any change to take effect,
restart the relay. Whenever power is removed and re-applied to the G30, the default deadbands will be in effect.
The
DNP TIME SYNC IIN PERIOD setting determines how often the Need Time Internal Indication (IIN) bit is set by the G30.
Changing this time allows the DNP master to send time synchronization commands more or less often, as required.
The DNP MESSAGE FRAGMENT SIZE setting determines the size, in bytes, at which message fragmentation occurs. Large
fragment sizes allow for more efficient throughput; smaller fragment sizes cause more application layer confirmations to be
necessary which can provide for more robust data transfer over noisy communication channels.
Check the “DNP Points Lists” G30 web page to view the analog inputs and/or binary inputs points lists. This page
can be viewed with a web browser by entering the IP address of the UR Ethernet port employed to access the G30
“Main Menu”, then by selecting the “Device Information Menu” > “DNP Points Lists” menu item.
The DNP OBJECT 1 DEFAULT VARIATION to DNP OBJECT 32 DEFAULT VARIATION settings allow the user to select the DNP
default variation number for object types 1, 2, 20, 21, 22, 23, 30, and 32. The default variation refers to the variation
response when variation 0 is requested and/or in class 0, 1, 2, or 3 scans. See the DNP Implementation section in the DNP
appendix.
The DNP binary outputs typically map one-to-one to IED data points. That is, each DNP binary output controls a single
physical or virtual control point in an IED. In the G30 relay, DNP binary outputs are mapped to virtual inputs. However,
some legacy DNP implementations use a mapping of one DNP binary output to two physical or virtual control points to sup-
port the concept of trip/close (for circuit breakers) or raise/lower (for tap changers) using a single control point. That is, the
DNP master can operate a single point for both trip and close, or raise and lower, operations. The G30 can be configured to
support paired control points, with each paired control point operating two virtual inputs. The
DNP NUMBER OF PAIRED CON-
TROL POINTS
setting allows configuration of from 0 to 32 binary output paired controls. Points not configured as paired oper-
ate on a one-to-one basis.
The
DNP TCP CONNECTION TIMEOUT setting specifies a time delay for the detection of dead network TCP connections. If
there is no data traffic on a DNP TCP connection for greater than the time specified by this setting, the connection will be
aborted by the G30. This frees up the connection to be re-used by a client.
Relay power must be re-cycled after changing the
DNP TCP CONNECTION TIMEOUT setting for the changes to take
effect.
k) DNP / IEC 60870-5-104 POINT LISTS
PATH: SETTINGS PRODUCT SETUP COMMUNICATIONS DNP / IEC104 POINT LISTS
DNP / IEC104
POINT LISTS
BINARY INPUT / MSP
POINTS
Range: see sub-menu below
MESSAGE
ANALOG INPUT / MME
POINTS
Range: see sub-menu below
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