Three-phase Active
Energy Meter
BL0952A/BL6513
Additionally, this structure can ensure the frequency characteristic. When the input signal
changes from 45Hz to 65Hz, the complete machine error due to the frequency change is less than
0.1%. In such, the meter designed for the 50Hz input signal can be used on the transmission-line
system of electric power whose frequency is 60Hz.
ꢁ
Current Channels
The voltage outputs from the current transducers are connected to the
BL0952A/BL6513/BL6511 current channels, which are fully differential voltage inputs. IAP, BP,
and ICP are the positive input for IAN, IBN, and ICN, respectively. The maximum peak
differential signal on the current channel should be less than
sinusoidal signal) for the specified operation.
± 500mV (353mV rms for a pure
Fig.7 shows a typical connection diagram for the one current channel (IA).
RF
CT
IAP
+
CF
±500mV
Rb
RF
AGND
-
IAN
IP
CF
AGND
AGND
PHASE NEUTRAL
Fig.7 Typical Connection for Current Channels
ꢁ
Voltage Channels
The output of the line voltage transducer is connected to the BL0952A/BL6513/BL6511 at
this analog input. Voltage channels are a pseudo-differential voltage input. VAP, VBP, and VCP are
the positive inputs with respect to VN. The maximum peak differential signal on the voltage
channel is
±
500mV
(
353mV rms for a pure sinusoidal signal) for the specified operation.
RF
PT
VAP
+
CF
±500mV
RF
AGND
-
VN
CF
AGND
AGND
PHASE NEUTRAL
CF
Ra
Rb
Rv
AGND
AGND
±500mV
VAP
VN
+
-
PHASE NEUTRAL
AGND
RF
CF
Ra >> RF
Rb+Rv=RF
AGND
AGND
Fig.8 Typical Connections for Voltage Channels
Notes: Because of the various external devices, the current channel and the voltage channel
may have the phase match error (mainly due to different RC constant and different phase delay).
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4/21/2009
Total 10 Pages
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