ROOTECH ACCURA 2300S, Руководство пользователя

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Accura 2300S/2350-1P3FSC User Guide Chapter 5 Measurements
ⓒ 2015 Rootech Inc. All Rights Reserved Page 147
3-Phase 3-Wire Connection
Voltage Wiring
You can use 2 or 3 PTs(Potential Transformer) in 3-phase 3-wire mode. Its installation cost differs
according to the number of PTs. However, regardless of how many PTs are used, Accura 2300S
measures voltage signals in the same way.
Fig 5.2 3P3W Connection with 2 PTs and 3 CTs
Voltage Measurement
Vector Diagram Item Description
V
1
V
2
V
3
V
r
= V
1
+ V
2
+V
3
V
N
V
n
= V
r
/ 3
Line-to-neutral voltage
sensing ▶ V
1
, V
2
, V
3
sensing based on the voltage at
the N terminal
Calculation of residual
voltage ▶ Calculates residual voltage based on the line-
to-neutral voltage sensed
Vr = V
1
+ V
2
+ V
3
Calculation of virtual
neutral voltage ▶ Calculates virtual neutral voltage by dividing
residual voltage by 3
Vn = Vr/3
▶ A newly calculated virtual neutral point is the
center of mass of the triangle consisting of V
1
,
V
2
, and V
3.