WO2023106961A1 - Installation haute tension mobile pour tester des transformateurs de puissance - Google Patents

Installation haute tension mobile pour tester des transformateurs de puissance Download PDF

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Publication number
WO2023106961A1
WO2023106961A1 PCT/RU2022/000211 RU2022000211W WO2023106961A1 WO 2023106961 A1 WO2023106961 A1 WO 2023106961A1 RU 2022000211 W RU2022000211 W RU 2022000211W WO 2023106961 A1 WO2023106961 A1 WO 2023106961A1
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WO
WIPO (PCT)
Prior art keywords
transformer
transformers
voltage
power
testing
Prior art date
Application number
PCT/RU2022/000211
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English (en)
Russian (ru)
Inventor
Владимир Николаевич РУЩИНСКИЙ
Алексей Юрьевич ВОЛКОВ
Евгений Александрович МИЛКИН
Виктор Иванович ЗАВИДЕЙ
Original Assignee
Федеральное Государственное Унитарное Предприятие "Российский Федеральный Ядерный Центр - Всероссийский Научно - Исследовательский Институт Технической Физики Имени Академика Е.И. Забабахина"
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from RU2021136021A external-priority patent/RU2780706C1/ru
Application filed by Федеральное Государственное Унитарное Предприятие "Российский Федеральный Ядерный Центр - Всероссийский Научно - Исследовательский Институт Технической Физики Имени Академика Е.И. Забабахина" filed Critical Федеральное Государственное Унитарное Предприятие "Российский Федеральный Ядерный Центр - Всероссийский Научно - Исследовательский Институт Технической Физики Имени Академика Е.И. Забабахина"
Publication of WO2023106961A1 publication Critical patent/WO2023106961A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers

Definitions

  • the invention relates to the field of power electrical engineering and can be used when testing powerful power transformers and autotransformers in remote, hard-to-reach places during their installation and repairs, without dismantling the equipment.
  • test diagnostics high-voltage tests
  • diagnostic studies allows you to assess the state of equipment insulation, determine the remaining resource and the possibility of extending service life.
  • the informativeness of such tests depends on the level of the applied test voltage, which must be higher than the rated operating voltage. This problem most affects equipment of higher voltage classes.
  • testing of such equipment is usually carried out only by the test connection to the network under operating voltage, which leads to serious damage to the equipment under test.
  • a known design is a mobile unit for diagnosing power distribution transformers, protected by RF patent No. 198361 "Mobile unit for diagnosing power distribution transformers", G01R 31/62, publ. 07/02/2020.
  • Known mobile installation refers to the diagnostic tools for power transformers and is intended for use in their places of operation, as well as when commissioning new power transformers in order to control the compliance of the actual values of no-load losses and short-circuit losses with the required energy efficiency class.
  • an autonomous three-phase voltage generator of industrial frequency a block of measuring current transformers, a measuring unit, a three-phase voltage regulator are mounted on a vehicle chassis, while the regulator is configured to generate an output voltage that exceeds its input voltage by at least 10 %, and the generator is configured to generate currents that are at least three times higher than the nominal value of the no-load current of the diagnosed power transformer.
  • the main disadvantage of the known mobile installation is the limitation on the power level from 0.063 to 2.5 MBA and voltage from 6 to 10 kV of the tested transformers, which is associated with a sharp increase in the weight and size parameters of the excitation source with an increase in its power characteristics.
  • a disadvantage of the known mobile installation is a relatively limited (regular) set of controlled parameters, which is valid for low-power power transformers, but is not sufficient for ultra-high voltage transformers with a power above 100 MBA.
  • a device for testing transformers according to the German patent No. 102007059289 "Device for testing transformers", G01R 31/12, publ. 07/28/2011.
  • the known device contains a static frequency generator with a filtering device, which also has several leads connected to a matching transformer, to which the transformer under test is connected.
  • one of the elements of the filtering device is a grounded screen in a matching transformer, the input of which is connected to a controlled frequency generator, and its output of the secondary winding is connected to a high-frequency filter formed by low-inductance capacitors with a grounded common point, which is electrically connected to the winding of the tested transformer .
  • a disadvantage of the known device is the high level of reactive power circulating in the power circuits during testing and, as a result, the significant mass and dimensions of the constituent elements of the known device, which prevent its execution as a mobile device with the power of the tested transformers from several hundred to several thousand MBA.
  • the known device there is also no possibility of obtaining information about the state of the windings of the active part of the transformer in the short circuit test due to the low sensitivity of the method for determining the complex resistance of the winding.
  • a known device for testing high voltage devices of high voltage technology contains a transformer in which a grounded electrostatic screen is provided between the primary side and the secondary side, a static frequency converter having several outputs connected to a filter device, and the filter device contains interconnected filter capacitors with a grounded star point, moreover, several outputs of the filter device are connected to a matching transformer, and the matching transformer, in turn, is connected to the transformer under test, while the transformer is connected to several inputs of the static frequency converter in such a way that the transformer provides a potential separation between the mains and the filter capacitors and thus the partial discharge measurement.
  • the filter device in the filter device, along with the filter capacitors connected in a star circuit, additional capacitors are provided, connected in a triangle circuit, filtering symmetrical disturbances between external conductors. Due to the fact that the transformer for the test system in the known device is moved to the side of the network, the entire installation acquires a total mass that is clearly reduced compared to the prior art.
  • the main disadvantage of the known device is the inefficient use of its power elements when testing electrical devices with inductive or capacitive loads due to the presence of a reactive component circulating in the excitation circuits of the tested transformer.
  • the objective of the invention is to increase the efficiency of using the power elements of the test installation, reduce the required power of the excitation transformer to reduce its weight and size parameters and implement the installation in a mobile version.
  • the technical result of the invention is the development of a highly efficient high-voltage installation for testing powerful and non-transportable transformers in the field, mobile, with increased excitation power required to implement the experience of idling and short circuit, with increased noise immunity and information content of the data obtained on the technical condition of the internal insulation and the level of pressing windings.
  • the set task and the required technical result are achieved due to the fact that the mobile high-voltage installation for electrical testing of power transformers is implemented in a block design and contains a control unit with the functions of measurement, control and regulation, supplying a network transformer, in which between the primary winding and the secondary winding is provided grounded electrostatic screen, rectifier with filter capacitor, static frequency converter, adjustable matching transformer, instrument transformer unit, test transformer, as well as compensating capacitors and switches.
  • Capacitances compensating for reactive power are located at the output of the matching transformer and form a resonant circuit with the winding of the tested transformer.
  • an impact generator of single pulses is additionally connected with the possibility of excitation of mechanical oscillations of the magnetic system of the tested transformer before and after the short circuit test, as well as a high-frequency inductive-capacitive filter.
  • the impact generator of single pulses is installed on the bottom of the tested transformer and connected to the control unit, and the high-frequency inductive-capacitive filter is connected in series on the connection line of the static frequency converter and the matching transformer.
  • the mobile high-voltage installation has an enhanced system for suppressing high-frequency interference generated by the supply network and a static frequency generator and allows you to expand the information effectiveness of tests, assess the technical condition of the test object by determining the electrical insulation and pressing the windings with induced voltage during idling and short circuit experiments.
  • shock device single pulse generator
  • a shock device single pulse generator
  • the use of a shock device allows you to increase the excitation power required to implement the test of idling and short circuit, increase the noise immunity and information content of the obtained data on the technical condition internal insulation by measuring the characteristics of partial discharges of insulation and the level of pressing of the windings, by the frequency characteristics of the induced EMF in the winding of the test object.
  • FIG. 1 a functional diagram of a mobile high-voltage installation for testing power transformers is presented.
  • FIG. 2 shows a plot of reactive power consumption versus excitation frequency.
  • a mobile high-voltage installation for testing power transformers, in a block version, contains a control unit 6 with the functions of measurement, control and regulation, supplying a network transformer 1, in which a grounded electrostatic screen 2 is provided between the primary winding and the secondary winding, a rectifier 3 with a filter capacitor 4, a static frequency converter 5, an adjustable matching transformer 9, a block of instrument transformers I, a test transformer 13, compensating capacitances 10, switches 12, 14, an impact generator of single pulses 15 with the possibility of excitation of mechanical oscillations of the magnetic system of the tested transformer 13 up to and after a short circuit test, as well as a high-frequency inductive-capacitive filter 8, connection lines 7, 18, 19, bus 16, terminals 17 of the secondary winding of the tested transformer 13.
  • the principle of operation of a mobile high-voltage installation for testing power transformers by induced voltage is based on changing the excitation frequency and achieving internal compensation of the reactive power of the test object due to current resonance.
  • the dependence of reactive power consumption on the excitation frequency is shown in the graph of Fig. 2. From the graph in Figure 2 it follows that when the excitation frequency is equal to the resonance frequency of the parallel circuit formed by the auxiliary capacitance and inductance winding of the tested transformer 13, the level of power required for its testing is reduced, in turn, its level depends on the quality factor of the elements that form the resonant circuit.
  • the quality factor of a parallel resonant circuit can reach a level of 80 to 90. This allows you to proportionally reduce the power of the excitation source and reduce the weight and size characteristics of the mobile installation as a whole.
  • Mobile high-voltage test facility for power transformers operates as follows.
  • a grounded electrostatic screen 2 is made between the primary and secondary windings of the transformer 1.
  • the voltage from the secondary winding of the transformer 1 is supplied to the rectifier 3 with a filter capacitor 4, which shunts the high-frequency interference coming from the supply network.
  • the voltage enters the static frequency converter 5, the outputs of which, through inductive and capacitive elements connected in a star, are connected to an adjustable matching transformer 9.
  • the static frequency converter 5 is connected via a connection line 7 to a control unit 6, which is designed to automate the preparation and testing , test management, and also to record their results.
  • the high-frequency inductive-capacitive filter 8 connected in series on the connection line of the static frequency converter 5 and the matching transformer 9 and formed by inductances and star-connected and grounded capacitances, reduces the presence high-frequency harmonics in the excitation circuit of the tested transformer 13 from the static frequency converter 5.
  • the output voltage from the static frequency converter 5 through a high-frequency inductive-capacitive filter 8 is fed to an adjustable matching transformer 9. From the output of the secondary adjusting winding of the transformer 9, the excitation voltage is supplied to compensating capacitances 10 in the form of high-quality capacitors connected in a triangle, the output of which is connected to the measuring unit transformers 11 and further through the switch 12 is connected to the windings of the tested transformer 13.
  • Reactive power compensation on the high voltage side is achieved by using high-quality capacitors in compensating capacitances 10, connected to the winding of the tested transformer 13 and forming a parallel resonant circuit with it, which makes it possible to carry out no-load and short circuit experiments with minimal loss of power of the excitation source.
  • the control unit 6 includes diagnostic equipment for measuring active and complex winding resistances, capacitance, inductance, dielectric loss tangent and insulation resistance, a spectral meter for the state of pressing and the geometric state of the windings, as well as partial discharge characteristics.
  • the control unit 6 is also connected to the instrument transformer unit 11, which includes voltage dividers and current transformers.
  • an impact generator of single pulses 15 s installed on the bottom of the tested transformer 13 and connected to the control unit 6, is additionally connected And the possibility of excitation of mechanical oscillations of the magnetic system of the tested transformer 13 before and after the short circuit test.
  • the control unit 6 sends a signal that disconnects the winding of the tested transformer 13 from the excitation system through the switch 12.
  • the control unit 6 from the winding of the transformer under test 13 receives the EMF measurement signal developed in the winding of the transformer 13, which provides information about the state of the winding pressing, characterizing its technical condition.
  • connection line 18 The supply of a pulse through the connection line 18 to the generator of single pulses 15 and the registration of the induced EMF along the connection line 19 is carried out while the switch 12 disconnects the circuits of the tested transformer 13 before and after the short circuit experience, while the bus 16 of the outputs 17 of the secondary winding of the tested transformer 13 opens.
  • One of the options for the implementation of a mobile installation, in a block (modular) container design, allows it to be transported in parts by various modes of transport, operated at negative temperatures and placed at substations near test objects in conditions of limited free space. It is also possible to implement a mobile installation as a single-module version in a separate container.
  • the mobile high-voltage power transformer test facility satisfies the requirements of mobility and provides the technical capability to test power transformers and autotransformers in the scope of acceptance tests. testing at their location, which makes it possible to meet existing regulatory requirements and carry out: verification of the transformation ratio; checking the connection group of transformer windings; measurement of winding resistance to direct current; checking losses and short circuit voltage (short circuit test); check of losses and measurement of current of experience of idling; determination of dielectric parameters of internal insulation according to the level of intensity of partial discharges; determination of the degree of winding pressing; testing the electrical strength of the insulation of linear bushings and the windings connected to them relative to the ground and other windings; testing the dielectric strength of the insulation between phases and the longitudinal insulation of the tested windings.
  • the above information testifies to the fulfillment of the following set of conditions when using this invention: the tool that embodies this invention in its implementation relates to the field of power electrical engineering and can be used when testing powerful power transformers and autotransformers in remote, hard-to-reach places during their installation and carrying out repairs;
  • a tool that embodies the invention in its implementation provides an increase in the efficiency of using the power elements of the test facility, a decrease in the required power of the excitation transformer to reduce weight and size parameters of the test facility and its implementation in a mobile version.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Relating To Insulation (AREA)

Abstract

L'invention se rapporte au génie électrique de puissance et peut être utilisée lors de la tenue de tests de transformateurs de puissance et d'autotransformateurs puissants dans des lieux éloignés et difficiles d'accès lors de leur installation, et pour effectuer des réparations sans démontage de l'équipement. Cette installation haute tension mobile pour effectuer des tests électriques sur des transformateurs de puissance est réalisée sous forme d'unités et comprend une unité de commande alimentant un transformateur de réseau, un redresseur avec un condensateur de filtration, un convertisseur de fréquence statique, un transformateur d'adaptation ajustable, une unité de transformateurs de mesure, un transformateur à tester, des capacités de compensation et des commutateurs. Les capacités de compensation de la puissance de réaction sont disposées à la sortie du transformateur d'adaptation et forment un circuit résonnant avec l'enroulement du transformateur à tester. Sont également connectés dans l'installation mobile un générateur de choc à impulsions uniques permettant d'exciter des oscillations mécaniques du système magnétique du transformateur à tester avant et après la tenue du test de court-circuitage, ainsi qu'un filtre d'arrêt haute fréquence à induction-capacité. Le résultat technique de l'invention consiste en l'élaboration d'une installation haute tension d'une grande efficacité pour tester des transformateurs puissants et non transportables dans des conditions de terrain, qui est mobile et possède une puissance d'excitation accrue nécessaire pour mener des tests de marche à vide et de court-circuitage, avec une résistance accrue aux interférences et une plus grande capacité informative des données obtenues sur l'état technique de l'isolation interne et du niveau de pressage des enroulements.
PCT/RU2022/000211 2021-12-08 2022-07-04 Installation haute tension mobile pour tester des transformateurs de puissance WO2023106961A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2021136021 2021-12-08
RU2021136021A RU2780706C1 (ru) 2021-12-08 Мобильная высоковольтная установка для испытаний силовых трансформаторов

Publications (1)

Publication Number Publication Date
WO2023106961A1 true WO2023106961A1 (fr) 2023-06-15

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2133888B1 (fr) * 2008-06-12 2011-08-10 ABB Technology AG Dispositif d'essai pour des composants électriques à haute tension par courant alternatif
US20120139556A1 (en) * 2009-06-03 2012-06-07 Rene Annowsky Device for testing high-voltage equipment
CN203249991U (zh) * 2013-05-02 2013-10-23 国家电网公司 用于变压器感应电压试验的装置
RU142928U1 (ru) * 2013-06-17 2014-07-10 Федеральное государственное унитарное предприятие "Всероссийский электротехнический институт им. В.И. Ленина" Устройство для проведения электрических испытаний однофазных и трехфазных силовых трансформаторов

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2133888B1 (fr) * 2008-06-12 2011-08-10 ABB Technology AG Dispositif d'essai pour des composants électriques à haute tension par courant alternatif
US20120139556A1 (en) * 2009-06-03 2012-06-07 Rene Annowsky Device for testing high-voltage equipment
CN203249991U (zh) * 2013-05-02 2013-10-23 国家电网公司 用于变压器感应电压试验的装置
RU142928U1 (ru) * 2013-06-17 2014-07-10 Федеральное государственное унитарное предприятие "Всероссийский электротехнический институт им. В.И. Ленина" Устройство для проведения электрических испытаний однофазных и трехфазных силовых трансформаторов

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