0BChapter 3
Functions
3-4
Functions
unctions
VT ratio
VT ratio
PMU1A
PMU1A
(Electric
power)
(Electric
power)
PMU2A
PMU2A
(Power
two-system)
(Power
two-system)
EMU8A
EMU8A
(Pulse/temperature)
(Pulse/temperature)
CTD8E
CTD8E
(CT
expansion)
(CT
expansion)
{
×
: With settings of two-system O: With setting X: Without setting
• Setting a VT ratio can measure a voltage higher than the standard by using general VT.
• Accuracy assurance is not applicable to general VT.
• Setting range: 001 to 99.99 (initial value: 1.00)
* The settings of CTD8E (CT expansion) should conform to those of the measurement
master. In addition, CTD8E (CT expansion) can perform the two-system measurement
only when it is connected to PMU2A (power two-system).
CT ratio
PMU1A
(Electric
power)
PMU2A
(Power
two-system)
EMU8A
(Pulse/temperature)
CTD8E
(CT
expansion)
{
×
: With settings of two-system O: With setting X: Without setting
• Setting the CT ratio by using general CT can measure currents higher than the standard of
dedicated CT.
• The CT ratio of general CT is set to make measurements by combining existing general
CT.
• Accuracy assurance is not applicable to general CT.
• Setting range: 1 to 1000 (Initial value: 1)
* Set it to 1 when it is not used.
* CTD8E (CT expansion) can perform the two-system measurement only when it is
connected to PMU2A (power two-system).
Low-cut function
• This function forcibly sets the current measurement value to 0 when the current value
becomes less than (standard current of CT) X (setting ratio).
• The ratio of an unmeasured load current to the standard current is set.
• As a result, setting the current value to 0 can set the electric power to 0. Setting this
function can cut current and power that are measured due to inductive noise in no-load
condition. Set an optimum value.
*1. The low-cut function works only when all currents of a phase connected to dedicated CT
becomes lower than or equal to the set current low-cut value.
*2. Effective values are used to judge low-cut. This means that, if the peak value is higher
than the low-cut value, and the effective value is lower than the low-cut value, the low-cut
function works.
z
Low-cut current value
PMU1A
(Electric
power)
PMU2A
(Power
two-system)
EMU8A
(Pulse/temperature)
CTD8E
(CT
expansion)
c
×
: With settings of two-system
c
: With setting
×
: Without setting
When the low-cut function works, the current and (active/reactive) power are fixed to 0, and
the power factor is fixed to 1.
Setting range: 0.1 to 19.9% (Initial value: 0.6%)
* CTD8E (CT expansion) can perform the two-system measurement only when it is
connected to PMU2A (power two-system).
二次側
5A
出力の
汎用
CT
1000A
専用
CT
(
ま
5A
形
KM20-CTF-5A
たは形
KM20-CTB-5A/50A)
形
KM1
<When 5ACT is connected>
General CT of secondary 5 A output
Dedicated CT
Model KM20-CTB-5A or Model KM20-CTB-5A/50A
Model KM1
