User manual

79
POWER INSTRUMENTS
no output. The CT primary value of I1 is 200A. The primary voltage of U1 is
10000V, PT2 is 100V. Then let’s look how all the related registers are set.
The rst record:
According to the table, the serial number of I1 is 9 ((14d8H)= 9); Conditions
in equation 1 determine the high limit. So “comparison mode” (14d9H) = 1(>).
CT1 is 200A, according to the relationship between the communication value
and numerical value. I=Rx X(CT1/5)/1000, so I1 is 180A. Then the limit is (14daH)
= 4500; Delay 5s, as the unit of Limit_t register is 10ms, so the delay time is
(14dbH) = 500; Alarming but no waveform triggering, “waveform capture” (14dcH)
= 0.
The second record:
According to the table, the serial number of U1 is 1 ((14ddH) = 1);
Conditions in equation 1 determine the low limit. So “comparison mode” (14d9H)
= 3(<); PT1 is 10000V, according to the relationship between the communication
value and numerical value, U=Rx X (PT1 / PT2) /10, so the register value should
be 998; Delay 10s, as the unit of Limit_t register is 10ms, so the delay time is
(14e0H) = 1000; Alarming but no waveform triggering, so “waveform capture”
(14e1H) = 0.
Settings between the two records:
“Alarming output” of the 1st, 2nd(101fH) = 0x0003; No hardware output,
(1020H)=0; (1021H)=0;(1022H)=0; (1023H)=0; logical and(1024H)=0x0001; At
last, the” alarming enable”, (101dH) =1.
Here is a gture showing the alarming settings: