Impact of Transformer Inrush Currents on Sensitive Protection Functions

Recommend Documents

Transformer inrush currents can be divided into three categories: ... inrush, and can result in the largest current magnitudes. To gain ... In theoretical cases where .

Elimination of transformer inrush currents by ... - Semantic Scholar

Switzerland. He is a past Chairman of the IEEE Switchgear Committee, a past. United States Representative to CIGRE Study Committee 13 (Switching Equip-.

Simulation of three-phase transformer inrush currents by using ...

Stiff detection procedures of differential equation systems that describe the three- phase transformer inrush ... models for the inrush current analysis. Several ...

The transformer inrush currents in large MV-cable ... - wseas.us

The transformer inrush currents in large MV-cable installations. FRANCESCO MUZI. Department of Electrical and information Engineering. University of L'Aquila.

Transformer Magnetizing Inrush Currents Using a Directly Coupled

Sep 19, 2013 - In distributed generation, the transformer may instead be premagnetized from the ..... The de-sat protection circuit is shown in Figure 4(a).

Estimation of Transformer Saturation Characteristics From Inrush

voltage and current waveforms to estimate the saturation characteristics. ... significantly the estimation of transformer inrush currents. A measurement ... netic circuit model represents the transformer with winding ... B. Magnetic Equivalent Circ

A Method for Identification of Transformer Inrush Current Based on

Oct 23, 2017 - MATLAB, the simulation has been performed to prove the efficiency reliability of the ... transmission line inductance and distributed capacitance.

Transformer Protection

Types of Protection. Mechanical Protection. • Analysis of Accumulated Gases. – Looks for arcing by-products. • Sudden Pressure Relays. – Orifice allows for ...

Investigation and Mitigation of Transformer Inrush Current during ...

Jan 4, 2013 - This paper investigates the inrush current due to black start of an IPP system with ..... [15] B. Kovan, F. de Leon, D. Czarkowski, Z. Zabar and L.

analitical analysis of transformer inrush current and some new - emo

Keywords: Inrush Current, Transformer, Analytical, Switching Time, EMTP, ATP. ABSTRACT ..... Theoretical Analysis and Design Guide, IEEE. Trans. on Power ...

Calculation of Inrush Currents â Benchmarking of ... - SINTEF

model for inrush current calculation is the construction of the ..... Power App. Syst., no. 4, ... âHybrid transformer model for transient simulation: Part I: development.

Modelling of Inrush Currents in Power Transformers by a Detailed ...

search. The largest converters have a nominal power in the range of 100 MVA in pulsed op- eration (SN about 20 MVA in continuous duty). About twenty power ...

Semianalytic Solution for a Simple Model of Inrush Currents in ...

This paper presents a proposal of a semianalytic solution for the system of differential equations that governs the ... By analytical solution of the two coupled ex-.

Modelling of Inrush Currents in Power Transformers by a ... - IPST

Keywords: Transformer inrush currents, equivalent .... The three-phase transformer shown in Fig. 6 [3] ... free space are represented by the linear reluctances.

Impacts of Non-Sinusoidal Load Currents on Distribution Transformer

Especially, this method is using in new electrical machine design procedures, now. ... Oil Natural Air Natural. PDC ..... phase oil-filled distribution transformer has been ..... Distributed Generation and Harmonic Filter Due to Losses and.

A controlled switching methodology for transformer inrush current

asymmetrical magnetic flux produced in the windings. In light of these facts ... fluxes left on the core limbs as a function of operating voltage previously applied to ... levels under transient conditions. As a direct .... following sequence: â¢. F

No-Load Losses in Transformer under Overexcitation/Inrush-Current ...

Author Affiliation: Omaha Public Power District; Kansas State. University. Abstract: ... Abstract: Existing phase domain transmission line models are ca- pable of ...

DC reactor type transformer inrush current limiter - IEEE Xplore

DC reactor type transformer inrush current limiter. M. Tarafdar Hagh and M. Abapour. Abstract: A new inrush current limiter (ICL) is presented to limit the inrush ...

Discrimination between Inrush and Short Circuit Currents in Differe

Dec 8, 2011 - Discrimination Between Inrush and Short Circuit. Currents in Differential Protection of Power Transformer Based on Correlation Method Using ...

Design of New Transformer Protection Device Based on Wavelet ...

... Protection Device Based on Wavelet Energy Entropy-Neural Network Theory and FPGA. Na Wu, Yinjing Guo, Yongqin Wei, Shuxian Fan, Xuehua Li ...

Protection of power transformer using microcontroller ...

43400 Serdang, Selangor Darul Ehsan, Malaysia. Te1:- 03-89466326, Fax:- 03-89466323. Email:- [email protected]. Abstract: This paper describes the ...

Mathematical Simulation of the Transformer Differential Protection

Equivalent circuit (a) and graph (b) for second harmonic braking circuit: ... 2. a) Oscillograms of phase primary currents of the HV side of the autotransformer;.

Simulation of Power Transformer Protection Using ...

Jun 1, 2015 - Due to over voltage of about +5% and send trip signal to the relay driver ... more users to very large units that are an integral part of the bulk.

ATP-Sensitive Potassium Channel Currents in Eccentrically ...

May 20, 2011 - ATP-sensitive potassium channels (KATP) protect the myocardium from hypertrophy induced by pressure-overloading. In this study, we ...

Impact of Transformer Inrush Currents on Sensitive Protection Functions

Download PDF

224 downloads 29663 Views 438KB Size Report

Comment

Sensitive protection functions that respond to currents are particularly affected. This paper review s ... Breaker-and-a-half applications call for extra consideration as both phase and ground ...... feed sub-transmission netw ork or a load center.

!

"

%

()

*

#

&

$

'

+,

-

)./)0+)11.

"

%

# %

% #%

$% &

#

%

$ % $% #

#

%

, &

%

" # %&

%

&

%

$

56

6 #

, &

#

%

%1

( %

&

%&

2

+

%$,

%+ # %%+" #

&4

#

% % $ *#

$

( %&

%

%

%

$

*

4

%

#

%

%

%

% %

% )5 % # " % #+ #

&

%

# %% 0

% "

%

4 %

#

# + + + % )$* % # ) * %

"

%

+

%$% $ % $ " + # ) *

) *

, '&

%

%

%%

&

* % + %%

1

%

%

*7&/

+ '

% %

&$

%$*

" %

0 %

%

% )(

$ %

#

#

%

# &

%%

%

&

(

%

(

% #+

'

!& ( % +$

'

&

*

+

#

$% . * /

, ,

)

%

)-

4

$

%

'

%

#

$ %

% )(

+ '

$

%$% %

%

&

%

%

%

&4 &

%

3 %&

%" %

&

+

%%

(

#

%

%$&

% #

% %

&

# $ %

&

+ '

-

%

23

(

$

&

"

'

&

& %%

"

+

$

+%

+

%

%$#

+

!778 !

% $+

:

$ 2

% %

%

+ +

% % 2& % &$

$

"

%

% ;

%

" +

%% + +

$ %

%

% + '

%

$

%%

% 2

%

2

(

%

%

%

#

6

89

6

8-9

6

89

6

%

&

%%

89

! -

&

$

%$'

%%

%

#

%

% & %

%%

%

%

%

%

5

&

#

%

(

2323

( 2

$

% $ $

(

&

23)3

3

#

# (

%

% %% # %

%

'

" %

%

%

%

&

"

%

#

$

$% !?+9?8 %

$

#

4

#

% % & $ %

%

(

%

%

-

&

&

% $ # #

$ %

%

%

)

%

$

%

%

#

% % $

%

(

*

%

%

$

%#

#

"

%

(

&

) >3* & % $ "

$

%

% & %

$

$% "

% % #

%

%

#

% %

%$) %

% +#

&

$

$

# #

$

&

'

#

%

%% # %% & -% &

% %

$ %

+

%

-

% %

%

$

% #

(

&

%

' %

#

-

#
1.5 pu of phase CTs I1 > I 0

I R1 = 3 ⋅ ( I 1 − I 0

)

), *

,

% % % !FG % % $ # $

+ 2 B

%

+ ' %

%

B

%& 2

% #+

& + '

'

+ '

+ '

%

), *

%

+ '

I R2 = 3 ⋅ I 2

'

+ '

% $

%

+ '

%%+%

1 ⋅ I1 8

$ % # !?78

+ '

%

$

%$)5*

%% # = )?*

I R2 = I 2

OR

%% &

%

%

5

> # % %

@9A % )9*& %

# % %

-

%

%

%

&#

!

%

I 7 7?

(

%

%$#

+ % 9

+

H ( ?

-B3

'

+ '

I R1 =

),$*

I R1 = 0

I 7 7?

9

/

%

%

!

/

%

%

5

I 7 7? 9 J

%%

(

%

I R ( k ) = max I R _ aux ( k ) , A ⋅ I R ( k −1)

#

+ '

2

)

%%

= )K*

=

"

%

-

?78

!

⋅

)

(

=

(

>

!

⋅

)

(

) !*

% % -

%+ % =

#

% #

>

)

)!G*

)

>

%

)!M* " #

%%

:

!

!9$&

%+

%

7? !?

#

%

% -F3 %

%

!5

%

9⋅ !

" 9+

% + +9 % %% %

$

# >

-B3

&

%+

#

= >

%

%$)

)9! * )9!$*

) * > M7°

)9! *

=

7 9?

9

2%

% -

% % #

+

$

'

)9!*

)

#

2 % !5 *

% %

%

$

%

% )3 !,

%

*

) -

%

* &

"

%

&$ % )< *

+ %

%

%

%

#

%

%

%$!5

89

89 B

H (

!

-B3

!?

8-9

-B3

% *& )3 ( %

!?

89

-B3