Set Points For Measured Values; User Defined Set-Points; Energy Metering; Functional Description - Siemens SIPROTEC 4 7UT6 Series Manual

Functions
2.22 Auxiliary Functions

Set Points for Measured Values

2.22.5
2.22.5.1

User Defined Set-Points

7UT6x allows limit levels for important measured and counter values to be set
If, during operation, a value reaches one of these set-points, the device generates an alarm which is indicated
as an operational message. As for all operational messages, it is possible to output the information to LED
and/or output relay and via the serial interfaces. Unlike real protection functions such as time overcurrent
protection or overload protection, this supervision routine runs in the background, so that in the case of a
fault and rapidly changing measured values it may not respond when protection functions pick up. Also, the
supervision does not respond immediately before a trip because an alarm is only output if the setpoint are
repeatedly violated.
Set-points can only be set if their measured and metered values have been configured correspondingly in CFC
(see /1/ SIPROTEC 4 System

Energy Metering

2.22.6
Metered values for active and reactive power are determined in the background by the processor system. They
can be called up at the front of the device, read out via the operating interface using a PC with DIGSI, or trans-
ferred to a central master station via the system interface.
2.22.6.1

Functional Description

7UT6x integrates the calculated power which is then made available with the Measured Values. The compo-
nents as listed in
protective object. The signs of the operating values depend (as for the powers) on the setting at address 1107
P,Q sign. Work calculation is not possible for single-phase busbar protection.
Energy metering can only be used in situations where a calculation of the power is possible.
The values are always positively incremented, decrementing does not occur. This means, for instance, that W
+ goes up if the real power is positive and that in the presence of a negative real power W
does not go down, etc.
Be aware that 7UT6x is, above all, a protection device. The precision of the metered values depends on the
transformer (normally protection core) and the device tolerance. The metering is therefore not suited for tariff
purposes.
The counters can be reset to zero or any initial value (see SIPROTEC 4 System Description).
Table 2-17
W
W
W
W
Operating Hours Metering
The main protective object is considered to be in operation if a current flows at least on one side, i.e. if the
minimum threshold for detection of a current flow is exceeded, e.g. for side 1 the threshold PoleOpen-
Curr.S1 (address 1111). A current which does not flow into the object from 2 measuring locations is theo-
retically zero because no current flows into the protective object.
In busbar protection, the busbar is considered to be in operation if a current flows through at least one meas-
uring location (i.e. one feeder).
The 7UT6x counts the operating hours and outputs them in the measured values. The upper limit is 999.999
hours (approx. 114 years).
You can define a setpoint for the operating hours for the output of an operational indication.
288
Manual).
Table 2-17 can be read out. Note that "input" and "output" are always as seen from the
Operational metered values
Measured values
+ Active power, output
p
– Active power, input
p
+ Reactive power, output
q
– Reactive power, input
q
– goes up, but W
p
Primary
kWh, MWh, GWh
kWh, MWh, GWh
kVARh, MVARh, GVARh
kVARh, MVARh, GVARh
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
p
+
p