GE Multilin T60 Transformer Protection System 5-21
5 SETTINGS 5.2 PRODUCT SETUP
5
Changes to the DNP CHANNEL 1 PORT and DNP CHANNEL 2 PORT settings take effect after power has been cycled to
the relay.
Do not set more than one protocol to the same TCP/UDP port number, as this results in unreliable operation of
those protocols.
The DNP ADDRESS setting is the DNP slave address. This number identifies the T60 on a DNP communications link. Each
DNP slave should be assigned a unique address.
The
DNP NETWORK CLIENT ADDRESS settings can force the T60 to respond to a maximum of five specific DNP masters. The
settings in this sub-menu are shown below.
PATH: SETTINGS PRODUCT SETUP COMMUNICATIONS DNP PROTOCOL DNP NETWORK CLIENT ADDRESSES
The DNP ADDRESS setting is the DNP slave address. This number identifies the T60 on a DNP communications link. Each
DNP slave should be assigned a unique address.
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 T60 waits for a DNP master to confirm an unsolicited
response. The
DNP UNSOL RESPONSE MAX RETRIES setting determines the number of times the T60 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 unsolic-
ited responses are sent is determined by the T60 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 T60 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 T60 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 T60 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 T60 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 dead-
band values, from the default, for each individual DNP analog input point. Whenever power is removed and re-applied to
the T60, 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 T60.
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.
DNP NETWORK
CLIENT ADDRESSES
CLIENT ADDRESS 1:
0.0.0.0
Range: standard IP address
MESSAGE
CLIENT ADDRESS 2:
0.0.0.0
Range: standard IP address
MESSAGE
CLIENT ADDRESS 3:
0.0.0.0
Range: standard IP address
MESSAGE
CLIENT ADDRESS 4:
0.0.0.0
Range: standard IP address
MESSAGE
CLIENT ADDRESS 5:
0.0.0.0
Range: standard IP address
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