Schweitzer Engineering Laboratories SEL-734, Instruction Manual, Page: 139 / 344

8.15
Date Code 20090730 Instruction Manual SEL-734 Meter
Logic
Output Contacts
To output the energy quantity KWHAO (A-phase kilowatt-hours out) in
kilowatt-hours primary, make the following settings:
EKYZ = 1
KE1_SCALE = PRI
KE1 = 1.8
KE1_UNIT = KILO
KYZD1 = KWHAO
KYZPW1 = 25
SET L <Enter>
OUT401 = R_TRIG KYZD1 or F_TRIG KYZD1
For every 1.8 kWh primary measured on A-phase out, the SEL-734 asserts
Meter Word bit KYZD1 for approximately 25 ms, thus closing
OUT401 for
approximately 25 ms.
Other KYZ pulses are output following the above example settings.
Total energy at the receiving end of these pulses can be calculated using
Equation 8.2 :
If KE n _SCALE is set to SEC:
Total Energy (Pri.) = Number of pulses • CTR • PTR • Energy per pulse
Total Energy (Sec.) = Number of pulses • Energy per pulse
If KE n _SCALE is set to PRI:
Total Energy (Pri.) = Number of pulses • Energy per pulse
Total Energy (Sec.) = Number of pulses • Energy per pulse/(CTR • PTR)
Equation 8.2
Output Contacts
Figure 8.15 shows the example operation of output contact Meter Word bits
(e.g., OUT401 through OUT402) resulting from the following:
➤
SEL
OGIC
control equation operation (e.g., SEL
OGIC
control
equation settings OUT401 through OUT402 in Figure 8.12 )
or
➤
PULSE command execution
The output contact Meter Word bits control the output contacts (e.g., output
contacts
OUT401 through OUT402 in Figure 8.15 ).
Alarm logic SALARM (software alarm Meter Word bit) and HALARM
(hardware alarm Meter Word bit) are available to make an alarm output
contact. OUT103 is set to OUT103 = NOT (SALARM OR HALARM) by
default.
Figure 8.15 is used for following discussion/examples.
Courtesy of NationalSwitchgear.com