Chauvin Arnoux pel 102, Руководство пользователя

Страница: 78 / 86

78
Quantities Formula
Phase-to-phase voltage harmonic distortion
level THD_U
ab
(%)
∑
−
=
× =
1
0
] 1 [ _
1
] [ _
N
x
abx ab
s U THD
N
agg U THD
Current harmonic distortion level THD_I
L
(%)
∑
−
=
× =
1
0
] 1 [ _
1
] [ _
N
x
Lx L
s I THD
N
agg I THD
Table 26
Note: N is the number of “1 second” values for the considered aggregation period (1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 or 60 min).
9.4. SUPPORTED ELECTRICAL NETWORKS
The following types of distribution systems are supported:
„
V1, V2, V3 are the phase-to-neutral voltages of the installation under test [V1=VL1-N; V2=VL2-N; V3=VL3-N].
„
Lower-case letters (v1, v2, v3) are used for sampled values
„
U12, U23, U31 are the phase-to-phase voltages of the installation under test.
„
Lower-case letters [u12 = v1-v2; u23= v2-v3, u31=v3-v1] are used for sampled values
„
I1, I2, I3 are the currents flowing in the phase conductors of the installation under test.
„
Lower-case letters i1, i2, i3 are used for sampled values
Distribution
network
Abbreviation
Phase
order
Remarks
Reference
diagram
Single-phase
(single-phase
2-wire)
1P- 2W No
The voltage is measured between L1 and N.
The current is measured on the L1 conductor.
See § 4.1.1.
Two-phase
(split-phase
single-phase
3-wire)
1P-3W No
The voltage is measured between L1, L2 and N.
The current is measured on the L1 and L2 conductors.
The neutral current is measured or calculated: i
N
= i
1
+ i
2
See § 4.1.2.
Three-phase,
3-wire ∆
[2 current sensors]
3P-3W ∆ 2
Yes
The power measurement method is based on the two-
wattmeter method with a virtual neutral.
The voltage is measured between L1, L2 and L3.
The current is measured on the L1 and L3 conductors. The
current I
2
is calculated (no current sensor on L2): i
2
= -i
1
-i
3
The neutral is not available for the measurement of the
current and of the voltage
See §
4.1.3.1.
Three-phase,
3-wire open
∆ (2 current
sensors)
3P-3WO2
See §
4.1.3.3.
Three-phase
3-wire wye
[2 current sensors]
3P-3WY2
See §
4.1.3.5.
Three-phase,
3-wire ∆ (3 current
sensors)
3P-3W ∆ 3
Yes
The power measurement is based on the three-wattmeter
method with a virtual neutral.
The voltage is measured between L1, L2 and L3.
The current is measured on the L1, L2 and L3 conductors.
The neutral is not available for the measurement of the
current and of the voltage
See §
4.1.3.2.
Three-phase,
3-wire open
∆ (3 current
sensors)
3P-3WO3
See §
4.1.3.4.
Three-phase,
3-wire, wye [3
current sensors]
3P-3WY3
See §
4.1.3.6.