Differential Protection Values; Measured Values Of Differential Protection; Functional Description - Siemens SIPROTEC 7SD610 Manual

Functions
2.17 Additional Functions
2.17.6 Remote Measured Values
2.17.6.1 Function Description
During communication via the protection data interface, the data from the other end of the protected object can
also be read out. For both devices, the currents and voltages involved as well as phase shifts between the local
and remote measured quantities can be displayed. This is especially helpful for checking the correct and co-
herent phase allocation and polarity at both line ends. Furthermore, the device address of the other device is
transmitted so that all important data of both ends are available in a substation. All possible data are listed in
Table 2-13.
Table 2-13 Operational measured values transmitted from the other ends and compared to the local values
Device ADDR
I , I , I remote
L1 L2 L3
, I , I local
I
L1 L2 L3
), ϕ(I ), ϕ(I ) remote
ϕ(I
L1 L2 L3
U , U , U remote
L1 L2 L3
U , U , U local
L1 L2 L3
), ϕ(U ) ϕ(U )
ϕ(U
L1 L2 L3
remote
The information overviews below show you which information is available for each device.
2.17.7 Measured values constellation

2.17.7.1 Functional Description

The measured values constellation of both possible devices are shown here by evaluating the device 1 (see
table 2-14). Information on the second device is given in the Appendix.
The computation of this measured values constellation is also performed during an existing system fault at an
interval of approx. 2 s.
The locally measured current/voltage is used as a reference for the angle. The angle values of the remote ends
refer to the locally measured value.
Example for the current of a 2-ends constellation:
Current IL1 at the local end 98 % angle 0°
Current IL1 at the local end 98 % angle 180°
By means of the device address, the devices can be distinguished one from another. Via the device address,
a polarity reversal of the current transformer can be detected immediately and the line angle can be read (if
voltages are available).
254
Data
Device address of the remote device
Phase currents of the remote device
Phase currents of the local device
Phase angles between the remote and the local phase currents
Voltages of the remote device
Voltages of the local device
Phase angles between the remote and the local voltages
Primary value
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
(absolute)
A
A
°
kV
kV
°