5.1.1 Voltage
SPM33 maximum measurement of phase voltage is 400V, three-phase
three-wire line voltage can up to 500V. Users should be noted that during the
design of this, to prevent internal measuring circuit saturation, resulting in
inaccurate measurements. Wiring mode of voltage can be set by the panel or
communication, support “Y” and triangle connection mode.
Recommendation: After changing the wiring mode, you`d best clear energy,
re-accumulate energy.
5.1.2 Current
SPM33 must be conducted by CT to measure current. CT secondary rated
output required to meet the input requirements of SPM33 rated current (5A or
1A). When using an external CT, wiring should prevent open, otherwise it will
generate a higher voltage in the secondary role In the primary excitation effect,
causing no casualties or damage to equipment.
SPM33 overload of current measurement channel is generally 1.2 times the
rated current measurements. During the design of this users should be noted
that, to prevent internal measuring circuit saturation, resulting in inaccurate
measurements. SPM33 current measurement range: 0 ~ 65kA. Setting range of
CT transformation ratio is: 1 ~ 10000A.
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