61869-2
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IEC 61869-2 Influences of the new standard on testing with the CT Analyzer
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Transcript of 61869-2
IEC 61869-2Influences of the new standard on testing with the CT Analyzer
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“This overview includes the most important new features with respect to the use of the CT Analyzer to test to the IEC 61869-2 standard.”Markus Jäger, CT Analyzer Product Manager
The IEC 61869-2 standard (Instrument transformers – Part 2: Additional requirements for current transformers) combines two former standards:
> IEC 60044-1 Instrument transformers – Part 1: Current transformers
> IEC 60044-6 Instrument transformers – Part 6: Requirements for protective current transformers for transient performance
This revision was initiated to reflect the technological advances and improvements in and around current transformers and their field of application.
The CT Analyzer incorporates this standard in the new software version 4.30.
IEC 61869-2 The new standard for current transformer testing
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Method for calculating the transient dimensioning factor
A revised method for calculating the transient dimensioning factor (Ktd) now also takes into account the latest protec-tive devices, which can detect and react to faults more quickly.For automatic reclosure (AR), special attention was focused on the trans- former‘s saturation behavior and to remanence decay.
A more precise calculation of the current transformer‘s transient response in the overall system can contribute to significant optimization of the dimensioning. The size advantage resulting from this not only offers direct cost advantages for the trans-former itself, it also simplifies deployments at locations where space is at a premium, for example, in gas-insulated switchgear (GIS).
An overview of the changes
IEC 61869-2 Ktd curve
0 s 0.05 s
ttfp,Maxttf,Max
Ktfp,Max
Ktf,Max
0.1 s 0.15 s 0.2 st
K
1
2
3
5
6
7
8
9
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KtfMax Ktfp Ktd
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Extended load range for all measurement classes
The optional extendable load range up to 1 VA can be applied to all measurement classes with the new standard.
This results in greater consideration of the digital systems used, which present lower loads when compared with analog systems.
IEC 60044-1 standard
IEC 61869-2 standard
Class 0.1 ■ ■
Class 0.2 ■ ■
Class 0.2S ■ ■
Class 0.5 – ■
Class 0.5S – ■
Class 1 – ■
Class 3 – ■
Class 5 – ■
AxisIEC 60044-1 standard
IEC 60044-6 standard
IEC 61869-2 standard
x RMS (Ie) Peak (Ie) RMS (Ie)
y RMS (Uct)Avg. cal. in RMS (E.M.F.)
Avg. cal. in RMS (E.M.F.)
Uniform measurement definitions
When recording the magnetization curve, RMS or peak values were measured, depending on the standard used. The new IEC 61869-2 standard combines these measurement definitions.
As such, measurements are now easier to perform and the risk of faults due to confusion has been reduced.
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Alternative measurement method
The new standard defines an alternative method for measuring the ratio error in compliance with the measuring principle employed by the CT Analyzer.
In contrast to the direct method, this reduces the measurement time and the measuring technology required. As a result, it greatly simplifies routine mea-surements performed during production and maintenance work in the field.
New definition of the maximum saturation flow
In the previous definition, the maximum saturation flow Ψsat was defined by the transition from the unsaturated to the saturated area of the magnetization characteristic curve.
The new IEC 61869-2 standard now rede-fines this value shifting the reference into the saturated area. The saturation flow value, which was previously defined as too low, has therefore been corrected.
Ψ
Ψsat
Ie
UsRmXm
IXm IRm
Ie
Ip
E0
E.M.F.
Rb
S2
S1Np:Ns
RCT
P2
P1
Xb
Is
Re
φs
Ip • = Is + IeNs
Np
Im
E.M.F.Us
Is • RCT
Is
Ie
Ip
IRmIXm
Ie
θ
UsRmXm
IXm IRm
Ie
Ip
E0
E.M.F.
Rb
S2
S1Np:Ns
RCT
P2
P1
Xb
Is
Re
φs
Ip • = Is + IeNs
Np
Im
E.M.F.Us
Is • RCT
Is
Ie
Ip
IRmIXm
Ie
θ
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New software version
You can download the new software ver-sion for the CT Analyzer free-of-charge in the Customer Area at www.omicron.at.
A detailed description of the installation process and further details on taking measurements with the CT Analyzer in line with the new standard can be found in the CT Analyzer user manual.
Activating the standard on the CT Analyzer
Once the latest version of the CT Analyzer software has been downloaded, you can activate the new IEC 61869-2 standard in the menu.
Working with the new standard
OMICRON Customer Area
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CT Analyzer user manual
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Activating the standard
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