Siemens SIPROTEC 7UT63 series User Manual

2.1 General
41
7UT613/63x Manual
C53000-G1176-C160-2
lates the overtemperature in the protected object from the flowing current, with refer-
ence to the permissible temperature. This method is characterised by its easy han-
dling and a low number of setting values.
Detailed knowledge about the protected object, the environment and cooling is re-
quired for overcurrent protection with hot-spot calculation in accordance with IEC
60354; it is advisable in case of transformers with integrated temperature detectors.
For this method, set address to 142 THERM. OVERLOAD = IEC354. For further details
see section 2.9
Overload
Protection 2
In case of 7UT613/63x it is possible to use an additional overload protection. In case
of a transformer, for example, the overtemperature of two windings can thus be de-
tected by means of current measurement or, apart from a transformer, the windings of
a shunt reactor can be monitored. For THERM.OVERLOAD2 under address 144 select
from the same options as for the first overload protection.
RTD-boxes for
Overload
If, in case of an overload with thermal replica, the coolant temperature must be taken
into consideration, or if an overload protection with hot-spot calculation in accordance
with IEC 60354 is used (address 142 THERM. OVERLOAD = th repl w. sens or
IEC354), at least one RTD-box 7XV5662–xAD must be connected at the service in-
terface or an additional interface of the device, which informs the device with regard
to the coolant temperature. The additional interface is set in address 190 RTD-BOX
INPUT. The possible interfaces are dependent on the version of 7UT613/63x (cf. Or-
dering Information and Accessories in the Appendix). Port C (service interface) is
available in all versions. Depending on the device version, Port D is also possible.
RTD-box Type If RTD-boxes with 7UT613/63x are operated, set the number and type of transfer of
measuring locations (RTD = Resistance Temperature Detector) under address 191
RTD CONNECTION: 6 RTD simplex or 6 RTD HDX (with one RTD-box) or 12 RTD
HDX (with two RTD-boxes). The settings have to comply with those of the RTD-box.
Note
The assignment with regard to which temperature measuring point shall be used for
which overload protection will be effected later during setting of the protection func-
tions.
Overexcitation
Protection
The overexcitation protection is used to detect increased overflux or overinduction
conditions in generators and transformers, especially in power station unit transform-
ers, which cause impermissible temperature rise in the iron. Note that the overexcita-
tion protection (address 143 OVEREXC. PROT.) can only be used if the device is
equipped with voltage measurement inputs and voltages are connected. This protec-
tion is not
applicable for single-phase busbar protection (address105 PROT. OBJECT
= 1ph Busbar). For further details see section 2.11
Reverse Power
Protection
The reverse power protection (address 150 REVERSE POWER) protects mainly a
turbine-generator unit during failure of energy to the prime mover. It can be applied,
for example, as disconnection criterion in the system. It can only be used in three-
phase protected objects, thus not
at address 105 PROT. OBJECT = 1 phase
transf. or 1ph Busbar. The reverse current protection requires that the device is
connected to a voltage transformer set and, together with a connected current trans-

Siemens SIPROTEC 7UT63 series Specifications

General

Brand	Siemens
Model	SIPROTEC 7UT63 series
Category	Protection Device
Language	English