YOKOGAWA WT500 - Integration

2-22
IM 760201-01E
2.6 Integration
The WT500 can integrate the active power (watt hour), the current (ampere hour), the
apparent power (volt-ampere hour), and the reactive power (var hour) values. During
integration, the measured and computed values of normal measurements can be
displayed in addition to the watt hour, ampere hour, volt-ampere hour, var hour, and
integration time values.
Integration Functions
Input Element Measurement Functions
The following nine types of numeric data can be determined. For details about the
determination of measurement function data, see appendix 1.
(1) WP: watt hours, i.e., the sum of positive and negative watt hours, (2) WP+: positive
watt hours consumed, (3) WP-: negative watt hours returned to the power supply, (4)
q: ampere hours, i.e., the sum of positive and negative ampere hours, (5) q+: positive
ampere hours consumed, (6) q-: negative ampere hours returned to the power supply, (7)
WS: volt-ampere hours, (8) WQ: var hours, and (9) Time: integration time.
•
Watt Hour Integration Method for Each Polarity (See section 5.11 for operating
instructions)
For positive and negative watt hours, WP+ and WP-, you can
set the integration
equation to determine the DC or AC watt hours. (DC watt hours are computed by
integrating each sampled data item. AC watt hours are computed by integrating the
values at each data update interval.)
•
Current Integration Modes (See section 5.12 for operating instructions)
You can select the type of current whose values will be integrated.
Wiring Unit
Σ
Measurement Functions (
Σ
Functions)
The following eight types of numeric data can be determined. For details about the
determination of measurement function data, see appendix 1.
(1) WP
Σ
: sum of WP values, (2) WP+
Σ
: sum of WP+ values, (3) WP-
Σ
: sum of WP-
values, (4) q
Σ
: sum of q values, (5) q+
Σ
: sum of q+ values, (6) q-
Σ
: sum of q- values, (7)
WS
Σ
: sum of S
Σ
values, and (8) WQ
Σ
: sum of Q
Σ
values.