IEC 61869-2-2012 pdf free

IEC 61869-2-2012 pdf free.Instrument transl formers Part 2: Additional requirements for current transformers.
This part of IEC 61869 is applicable to newly manufactured inductive current transformers for use with electrical measuring instruments andlor electrical protective devices having rated frequencies from 15 Hz to 100 Hz.
2 Normative references
Clause 2 of IEC 61869-1:2007 is applicable with the following additions:
IEC 61869-1:2007, Instrument Transformers — Part 1: General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions in IEC 61869-1:2007 apply with the following additions:
3.1 General definitions
3.1.201 current transformer
instrument transformer n which the secondary current, under normal conditions of use, is substantially proportional to the primary current and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections
[SOURCE: IEC 60050-321:1986, 321-02-01)
3.1.202 measuring current transformer
current transformer intended to transmit an information signal to measuring instruments and meters
[SOURCE: IEC 60050-321:1986, 321-02-18)
3.1.203 protective current transformer
a current transformer intended to transmit an information signal to protective and control devices
[SOURCE: IEC 60050-321: 1986, 321-02-19)
3.1.204 class P protective current transformer
protective current transformer without remanent flux limit, for which the saturation behaviour
in the case of a symmetrical short-circuit is specified
3.1.205 class PR protective current transformer
protective current transformer with remanent flux limit, for which the saturation behaviour in
the case of a symmetrical short-circuit is specified
Ratings
5.3 Rated insulation levels
5.3.2 Rated primary terminal insulation level
Clause 5.3.2 of IEC 61869-1:2007 is applicable with the addition of the following: For a current transformer without primary winding and without primary insulation of its own, the value Um = 0,72 kV is assumed.
5.3.5 Insulation requirements for secondary terminals
Clause 5.3.5 of IEC 61869-1:2007 is applicable with the addition of the following:
The secondary winding insulation of class PX and class PXR current transformers having a rated knee point e.m.f. EK 2 2 kV shall be capable of withstanding a rated power frequency withstand voltage of 5 kV r.m.s. for 60 s.
5.3.201 Inter-turn insulation requirements
The rated withstand voltage for inter-turn insulation shall be 4,5 kV peak.
For class PX and class PXR current transformers having a rated knee point e.m.f. of greater than 450 V, the rated withstand voltage for the inter-turn insulation shall be a peak voltage of 10 times the r.m.s. value of the specified knee point e.m.f., or 10 kV peak, whichever is the lower.IEC 61869-2 pdf free download.