Siemens 9700, Руководство по установке, Страница: 22 / 45

32:(50(7(5,167$//$7,21$1'%$6,&6(783
4-Wire Wye, 2½-Element, 2 PT Connection Diagram
Fuses
2A
PTs
Fuses
N N N C B A
LINE
V1
V2
V3
Vref Vref
V3
V2 V2
V1
CT Shorting Switch
or Test Block
CTs CTs CTs
I1
I2
I3
I4
I11 I11
I12
I21 I21
I22
I31
I32
I32
I41
I42
Neutral current
input is optional. Switchgear
Chassis Ground
Supply Power
(dependent on equipped
power supply option)
3 A slow-blow
3 A slow-blow
+
_
N/-
L/+
Import
Export
LOAD
3-Wire Grounded Wye, 3-Element Direct Connection Diagram
LINE
A B
N
Fuses
2A
CTs
C
CT Shorting Switch
or Test Block
Export
Import
Switchgear
Chassis Ground
Supply Power
(dependent on equipped
power supply option)
2 A slow-blow
2 A slow-blow
LOAD
V1
V2
V3
Vref
V1
V2
V3
I11
I12
I21
I22
I31
I32
I1
I2
I3
+
_
L/+
N/-
2
38)
This 2½-element scheme
requires only 2 PTs. In this
configuration, the phase B
voltage displayed by the
meter is derived from the
phase A and C voltages.
VOLTS MODE should be set
to 3W-Wye.
2
38)
When the common or star
point of a 3 wire Wye
system is grounded, the
9700 Power Meter may be
connected directly without
the use of PTs, provided the
phase voltages are within
the device’s range.
VOLTS MODE should be set
to 4W-Wye.