4–44
PQM POWER QUALITY METER – INSTRUCTION MANUAL
S4 ALARMS/CONTROL
CHAPTER 4: PROGRAMMING
For 4-wire wye (3 VTs), 4-wire wye (2 VTs), 4-wire direct, and 3-wire direct connections,
the phase reversal function operates when the angle between phase A and B
becomes
≤
–150° or
≥
–90° as shown below.
FIGURE 4–23: Phase Reversal For 4-wire & 3-wire Direct Connections
For the 3 WIRE DELTA (2 VTs) connection the phase reversal function operates when
the angle between phase A and B becomes
≤
30° or
≥
90° as shown below.
FIGURE 4–24: Phase Reversal For 3-wire Delta (2 Vts Open-delta) Connection
When the SINGLE PHASE DIRECT connection is used the phase reversal feature will
never operate.
•
VOLTAGE PHASE REVERSAL DELAY:
If a voltage phase reversal exists for the time
programmed in this setpoint a voltage phase reversal condition will occur.
Vb(c o
r
n)
+
30
°
V
a(b o
r n
)
=
0
°
(
r
e
f
e
r
ence)
V
c(a o
r n
)
= –
240
°
Vb(c o
r
n)
–
30
°
V
b(c o
r n
)
= –1
20
°
shaded a
r
ea
=
an
gl
e to
l
e
r
ance a
ll
owed
be
f
o
r
e phase
r
e
v
e
r
sa
l
w
ill
occu
r
Vcb
–
30
°
V
ab
=
0
°
(
r
e
f
e
r
ence)
Vcb
+
30
°
V
cb
= 6
0
°
V
bc
= –1
20
°
shaded a
r
ea
=
an
gl
e to
l
e
r
ance
a
ll
owed be
f
o
r
e phase
r
e
v
e
r
sa
l
w
ill
occu
r
Содержание Multilin PQM
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