Metered Measurands - Siemens SIPROTEC 7SJ61 Manual

1.4

Metered measurands

Scaling
Example
Reference
7SJ61 / 7SJ62 / 7SJ64 Bus mapping
C53000-L2540-A306-2
Metering values (e.g. kWh) are not defined in the IEC 60870-5-103 standard and there
are no compatible data units available which are suitable for the transmission of me-
tered values. Some SIPROTEC 4 relays offer the possibility to transmit metered val-
ues via the IEC 60870-5-103 interface. For this reason, the private data unit 205 has
been defined for the transmission of metered values. This data unit 205 is sent spon-
taneously. Only one metering value per data unit is transmitted.
The scaling of the metered measurands, which are derived from measured values is
defined as:
60000 impulses per hour for V = Vprim and I = Iprim
V = Full Scale Voltage
prim
(parameter address = 1101)
I = F
S C
ULL CALE URRENT
prim
parameter address = 1102)
In the parameter set is configured:
I = 1000 A and V
prim
60000 impulses correspond so that:
1 h * 1000 A * 400 kV * √3 = 692.82 MWh
Note
• The type of the update (cyclic, with or without deletion) and the update interval must
be programmed for the metered measurands with the parametrization software
DIGSI 4. If the parameter was set to update with deletion, then the value will be de-
leted in the device after transmission.
• The scaling of the metered measurands at binary inputs ("Wp(puls)" and
"Wq(puls)") is independent from the definition above and depends on the externally
connected pulse generator.
Refer to chapter 3.3.5
= 400.0 kV,
prim
Notes to SIPROTEC objects
15