To show the analog value in primary units, and if I
n
(CT) = 300 A and the accuracy
of the analog value = 1 A:
1. Take any unused scaling factor and set it to 300.
2. Set the scaling index pointer of the analog value to point at the scaling factor.
3. The value range is now 0.00 ×300....50.0 × 300 = 0...15000 A.
DNP analog values deadband
The deadband is always defined in units of the original value when scaled using the
internal (fixed) scaling factor, irrespective of whether the internal scaling factor is
used for value presentation or not.
Example:
For a deadband of 2% I
n
(CT) when the internal scaling factor is 100, the
deadband value is set as follows: 0.02 × 100 = 2. If the scaling factor is set to
300 A, the scaled deadband is 300 A × 0.02 = 6 A.
5.1.17. SPA bus communication protocol parameters
Altering parameter values via serial communication requires the use of the SPA
password in some cases. The password is a user-defined number within the range
1...999, the default value being 001. SPA parameters are found on channels 0...5,
503...504, 507 and 601...603.
To enter the setting mode, enter the password into parameter V160. To exit the
setting mode, enter the same password into parameter V161. The password
protection is also reactivated in case of loss of auxiliary voltage.
The password can be changed with parameter V162, but it is not possible to read
the password via this parameter. Abbreviations used in the following tables:
*
R = readable data
*
W = writeable data
*
P = password protected writeable data
116
REF610REF610
Feeder Protection Relay
Technical Reference Manual - ANSI Version
1MRS755535
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