8-Bit Switches - GE N60 Instruction Manual

CONTROL ELEMENTS
Analysis of metering errors at UR-2
The remote and local power values are measured with the maximum error of ±1% of reading (at power factors above 0.8).
The digitization (round up) error is 0.2% of full scale, or 0.002 x 2 x 1500 MW = 6 MW. Consequently,
• Remote power is measured at UR-2 with a worst-case error of ± (1% of reading + 6 MW)
• Total power is measured at UR-2 with a worst-case error of ± (1% of UR-1 reading + 1% of UR-2 reading + 12 MW)
For example, with a reading of 1020 MW at UR-1 and 800 MW at UR-2, the remote power is measured at UR-2 with the
worst-case error of ±(0.01 x 1020 MW + 6 MW) = ±16.2 MW, or ±1.6%. The reading for remote power at UR-2 is the product
of the digitized value sent from UR-1 and received at UR-2 and the scale factor setting. That is,
Therefore, the reading for the remote power at UR-2 is 1015.7 MW, versus 1020 MW at the point of origin (UR-1).
The total power is measured at UR-2 with the worst-case error of ± (0.01 x 1020 MW + 0.01 x 800 MW + 12 MW) = ±30.2MW,
or ±1.7%. The reading for the total power at UR-2 is the sum of the digitized value sent from UR-1 and received at UR-2 and
the digitized value at UR-2 multiplied by the scaling factor. That is,
Therefore, the reading for the total power at UR-2 is 1818.7 MW, versus a true total of 1020 MW + 800 MW = 1820 MW.
5

5.8.14 8-bit switches

SETTINGS  CONTROL ELEMENTS  8-BIT SWITCHES  8-BIT SWITCH 1(6)
 8-BIT
 SWITCH 1
This feature allows switching between two input arguments defined by 8 bits each. The bits are specified by FlexLogic
operands. The feature could be viewed as an integrated two-position switch for 8 logic signals.
Typically this element is applied in conjunction with the Digitizer and 8-bit Comparator features.
The switch runs every half power cycle (every four protection passes).
5-272
8BIT SWITCH 1

FUNCTION: Disabled
8BIT SW 1 ARG A0:

Off
8BIT SW 1 ARG A1:

Off

8BIT SW 1 ARG A7:

Off
8BIT SW 1 ARG B0:

Off
8BIT SW 1 ARG B1:

Off

8BIT SW 1 ARG B7:

Off
8BIT SW 1 CONTROL:

Off
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
Range: Disabled, Enabled
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Eq. 5-34
Eq. 5-35