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Friday, July 31, 2020 | History

2 edition of Ferroresonance tests on the 500-kV potential transformers at Watts Bar Nuclear Plant found in the catalog.

Ferroresonance tests on the 500-kV potential transformers at Watts Bar Nuclear Plant

J. R Boyle

Ferroresonance tests on the 500-kV potential transformers at Watts Bar Nuclear Plant

by J. R Boyle

  • 294 Want to read
  • 10 Currently reading

Published by Tennessee Valley Authority in Chattanooga, Tenn .
Written in English

    Subjects:
  • Electric transformers -- Testing

  • Edition Notes

    StatementJ.R. Boyle, C.L. Ballentine, B.R. Farris
    ContributionsBallentine, C. L, Farris, B. R, Tennessee Valley Authority
    The Physical Object
    Pagination20, [27] leaves :
    Number of Pages27
    ID Numbers
    Open LibraryOL14948919M

    cable run and padmount transformer was connected, the system was energized from the riser pole cutouts to test it. At some point, the number of transformers and cable capacitance was sufficient to support strong ferroresonance. The problem in this case was first noticed when the unloaded system was being de-energized after testing. WhenFile Size: KB. Ferroresonance Phenomenon in Power Transformers. 75 0 50 0 S upply voltage V 1, in volts Transformer primary.

      Ferroresonance and Transformer Connections are related as such that the latter is a significant factor to the occurrence of the former during loss of phase or open phase conditions. There are certain transformer configurations that are more susceptible to ferroresonance. Generally, ferroresonance phenomenon becomes highly probable if the primary windings of the three-phase transformer . these transformers coincided with an increasing frequency of ferroresonant situations. Consequently, the core loss is the best indicator of how long the cable length should be to guarantee the absence of ferroresonance in a transformer single-phase switching [3]. Furthermore, the voltage rating of the transformerCited by: 8.

    Ferroresonance Occurrence In Power Transformer (photo by SNC Manufacturing Co. Inc.) Ferroresonance is usually associated with potential transformers, which are instrument transformers that are used to develop voltages used by relays; however, it can also occur with power transformers under special circumstances. the magnetizing impedance of a transformer is placed in series with a system capacitor. This happens when there is an open-phase conductor. Under controlled conditions, ferroresonance can be exploited for useful purpose such as in a constant-voltage transformer. Ferroresonance is different than resonance in linear system elements. In linear File Size: KB.


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Ferroresonance tests on the 500-kV potential transformers at Watts Bar Nuclear Plant by J. R Boyle Download PDF EPUB FB2

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– Thousands of individual tests – Transformer sizes from 75 to kVA –, and kV primary voltage – Tests with a wide range of opened-phase capacitances – Energization and deenergization • Focused on Yg-Yg on 5-leg core, also some D-Yg • Goal: new guidelines that work!File Size: KB.

The ferroresonance phenomenon can be observed when the PV rooftop system is linked to the low voltage side of the distribution transformer via three single-phase fuse cutouts.

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. Watts Bar Nuclear Plant, Unit 2 NRC Docket No. Subject: Watts Bar Nuclear Plant (WBN) Unit 2 - Safety Evaluation Report Supplement 22 (SSER 22) -Second Response to NRC Required Action Items References: 1. The ferroresonance or nonlinear resonance is a complex phenomenon, which may cause overvoltage in the electrical power system and endangers the system reliability and operation.

The ability to predict the ferroresonance in the transformer depends on the accuracy of the transformer model used. In this paper, the effect of the new suggested ferroresonance limiter on the control of the chaotic Author: Hamid Radmanesh, Hamid Radmanesh, G.

Gharehpetian, Hamid Fathi. network or bus bar whereabouts, then resistance-reduction measure should be taken to the cable. 3 Test of WX type of device in network Inmore than 50 times of resonance-suppression tests were carried out in 10kV networks of Tieling old city, Liaoyang Lighthouse etc.

Considering that the higher is the network voltage level,File Size: KB. Watts Bar Nuclear Plant Nuclear Plant Road Spring City, Tennessee Mr. Pickett, Senior Project Manager U.S.

Nuclear Regulatory Commission MS 08G9a One White Flint North Rockville Pike Rockville, Maryland U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth St., SW, Suite 23T The ferroresonance phenomenon in voltage transformers is analyzed in this section through several software simulation examples, using the software tool MATLAB.

A software model has been developed based on test data obtained on a real voltage transformer. Figure 6 shows the saturation curve of the voltage transformer model by: The ferroresonance phenomenon can be observed when the PV rooftop system is linked to the low voltage side of the distribution transformer via three single-phase fuse : R.A.

Walling. ferroresonance which led to equipment failures and electrical blackout. It must be noted that most of the literatures concentrated on ferroresonance in power transformer only. In contrast, this research will place ferroresonance in capacitive voltage transformer (CVT) as the main Size: 1MB.

Choosing a Backup Generator Plus 3 LEGAL House Connection Options - Transfer Switch and More - Duration: Bailey Line Road Recommended for you. ferroresonance. Make sure, the parameters of system aren’t in risk area.

And if it’s possible provide them some safety zone far away from this area. Make sure, the power from supply isn’t enough to hold ferroresonance. It can be provided by dumping According to IEC temporary ferroresonance overvoltage has to be damped. ©File Size: KB.

Ferroresonance causes overvoltages and overcurrents which may jeopardize the safety of power system equipment. In this paper, a comprehensive study of the phenomenon was made using a 3 phase,core type,kva,33/kv Dy11 power transformer and.

Ferroresonance Phenomenon in Power Plant Auxiliary Grids Author Maciej Łosiński Keywords Medium voltage auxiliary grid of power plant, ferroresonance, ferroresonance suppression Abstract The paper discusses the problem of the ferroresonance phenomenon occurring in a medium voltage grid with an ungrounded neutral point of the supply transformer.

Voltage waveform recorded on the voltage transformers’ secondary side during ferroresonance. 3U0 – open delta circuit voltage, U_L1 – phase voltage, U_L12 – line-to-line voltage Fig. Voltage and current waveforms on the voltage transformers’ primary side after inclusion of R = 30 Ω switching resistor in the open delta : Maciej Łosiński.

Abstract—This paper studies the effect on Metal Oxide Varistor (MOV) on ferroresonance phenomenon in iron core voltage transformer (VT). It is expected that MOV generally cause ferroresonance ‘dropout'.

Time-domain study has been carried out to study this effect. Simulation has been done on a voltage transformer rated VA, kV. The AFR 31 Smart Load is an instrument designed to protect metering voltage transformers against adverse effects of ferroresonance in high voltage power distribution systems with ungrounded or indirectly grounded neutral wire.

Ferroresonance comes up between transformer inductance and conductors’ or switching elements’ capacitance. ponents and parameters of the ferroresonance phenomenon such as line length, point-on-wave switching and transformer core loss. The modelling work carried out in ATP (commercially avail-able software) on a MV A //13 kV power transformer model is described and the simulation with field ferroresonance test recordingsis verified.

The Cited by: The ferroresonance phenomenon, in most situations, consists of a capacitance and an inductance and there is no definite resonant frequency, so more than one response is possible for the same set of parameters including fundamental, subharmonic and chaotic this section, the ferroresonance equivalent circuit is a power transformer connected to the power by: There are two common methods of loading used to minimize the effects of ferroresonance.

One is to install the VT’s with their secondary windings connected in a broken delta and with a resistor completing the broken delta circuit. The watts of the resistor should equal 50% of the VA of a single Size: KB.

ferroresonance involving: a) kV bus VTs and circuit breaker voltage grading capacitors, b) lightly loaded kV pad-mount transformer fed by underground cab le, c) failure of 72 VTs in temporarily ungrounded kV European system, and d) synch-check VT on ungrounded kV delta winding of a .This work studies the non-conventional ferroresonance oscillation in the kV substation.

Voltage transformer (VT) which is used in this substation has a VA capacity and magnetization characteristic of it was modeled by single-value two-term polynomial with q=7.

In this study, at first ferroresonance oscillation in VT has been introduced, then effect of Metal Oxide Varistor (MOV) on.Introduction. Ferroresonance occurs because of an interaction between a nonlinear inductance with series and parallel capacitances and low the event analyzed in this paper, ferroresonance occurred in the interaction between the nonlinearity of an inductive voltage transformer (IVT) with grading capacitors and conductor by: 7.