WO2006123962A1 - Procede permettant de proteger un utilisateur d'un reseau triphase a courant alternatif contre les dysfonctionnements, et dispositif destine a sa mise en oeuvre - Google Patents

Procede permettant de proteger un utilisateur d'un reseau triphase a courant alternatif contre les dysfonctionnements, et dispositif destine a sa mise en oeuvre Download PDF

Info

Publication number
WO2006123962A1
WO2006123962A1 PCT/RU2005/000271 RU2005000271W WO2006123962A1 WO 2006123962 A1 WO2006123962 A1 WO 2006123962A1 RU 2005000271 W RU2005000271 W RU 2005000271W WO 2006123962 A1 WO2006123962 A1 WO 2006123962A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase
phase shift
current
network
consumer
Prior art date
Application number
PCT/RU2005/000271
Other languages
English (en)
Russian (ru)
Inventor
Sergei Vladimirovich Kozhelsky
Vladimir Leonidovich Krushev
Vladimir Timofeevich Krushev
Alexandr Leonidovich Krushev
Original Assignee
Sergei Vladimirovich Kozhelsky
Vladimir Leonidovich Krushev
Vladimir Timofeevich Krushev
Alexandr Leonidovich Krushev
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
Application filed by Sergei Vladimirovich Kozhelsky, Vladimir Leonidovich Krushev, Vladimir Timofeevich Krushev, Alexandr Leonidovich Krushev filed Critical Sergei Vladimirovich Kozhelsky
Priority to PCT/RU2005/000271 priority Critical patent/WO2006123962A1/fr
Publication of WO2006123962A1 publication Critical patent/WO2006123962A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/38—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to both voltage and current; responsive to phase angle between voltage and current

Definitions

  • the invention relates to the field of electrical engineering and more specifically relates to a method for protecting consumers of AC power from emergency operating modes and devices for its implementation.
  • this method of protection is characterized by relatively low accuracy associated with the error of the measuring transducers of phase currents and the error in the implementation of computational operations.
  • This method is also characterized by low accuracy associated with the error of the measuring transducers of current and voltage, as well as the error of computational operations.
  • This method is difficult to implement and, in addition, is characterized by relatively low accuracy, which is due to the error of the measuring transducers of current and voltage, the error of computational operations, as well as the error in determining active losses by operating characteristics.
  • the closest in its technical solution is a method of protection against earth faults of an alternating current contact network (SU, A, 637890 H 02 H 3/16, 3/38), in which the phase angle between the current and voltage is continuously measured, compared with the reference angle and form a trip signal, in case the measured angle is less than the reference, moreover, the current value in the contact network is continuously measured and the reference angle is continuously determined from the measured current value depending on the measured current value.
  • SU alternating current contact network
  • this method has a limited scope and provides protection only against short circuit or network overload), and the need to measure the absolute value of the current in the network narrows the range of controlled power consumption from the network.
  • the basis of the invention is the task of creating a method of protecting consumers of energy of a three-phase AC network from emergency operating modes, which would protect the consumer from the maximum possible number of emergency operating modes, reduce the influence of errors of current and voltage transducers, and increase the accuracy of measurements of power parameters, consumed from the mains and eliminated false positives, as well as create a device for the implementation of such a method, which would be simple to implement and reliable in operation.
  • the method of protecting the energy consumer of a three-phase AC network from emergency operation consists in determining the current values of the phase shifts between the supply voltage and the current consumption or current consumption in at least two phase conductors, compare these current values with acceptable values of the phase shift in the range specified taking into account the maximum and minimum values of the consumer power factor and disconnect the consumer from the network if kuschee phase shift value is beyond a predetermined range.
  • the device for protecting consumers of AC power from emergency operation containing current sensors, voltage sensors and a shutdown unit in the phase conductors connected to the consumer, according to the invention, contains a phase shift control unit connected by inputs to outputs sensors of current and voltage and configured to issue a signal to disconnect the consumer from the AC network to the control input of the shutdown node in the event that the phase shift is outside the range range of permissible phase shift values.
  • the device further comprises an input / output device connected to the phase shift control unit, adapted to input and output the values of the set allowable phase shift range, as well as consumer parameters, before and after the trip.
  • the device further comprises a synchronization unit, the inputs of which are connected to the phase conductors of the network, and the output is connected to the phase shift control unit.
  • phase shift between the voltages and the consumed currents in the three-phase network, as well as between the consumed currents in the various phase conductors, is essentially the only and sufficient indicator of the consumer's work with the reactive nature of the load, controlling which according to the proposed method it is possible to protect the consumer from any emergency operating conditions.
  • the mentioned phase shift can be measured both in the time domain and in the frequency domain. Conversion from one unit of measure to another can be done through operations that are obvious to those skilled in the art. Due to the fact that the time measurement corresponding to the phase shift can be performed with much higher accuracy than the measurement of currents or voltages, taking into account the need to ensure the linearity of their conversion, the present invention can significantly improve the accuracy of measurements.
  • Fig. L depicts a diagram of an AC power consumer protection device that implements the method according to the invention for the case a three-phase network with phase shift control between phase voltage and current consumption in each supply conductor;
  • figure 2 - diagram of another variant of the same device for the case of a three-phase network with phase shift control between the phase voltage of one conductor and the total current of two other conductors for two different combinations of conductors;
  • FIG. L depicts a diagram of an AC power consumer protection device that implements the method according to the invention for the case a three-phase network with phase shift control between phase voltage and current consumption in each supply conductor
  • figure 2 - diagram of another variant of the same device for the case of a three-phase network with phase shift control between the phase voltage of one conductor and the total current of two other conductors for two different combinations of conductors
  • FIG. L depicts a diagram of an AC power consumer protection device that implements the method according to the invention for the case a three-phase network with phase shift control between phase voltage and current consumption
  • 3 is a diagram of a variant of the same device for a three-phase network with phase shift control between the phase-to-phase voltage of two conductors and the total currents of these conductors for two different combinations of conductors;
  • 4 is a timing diagram of the control of the phase shift between all phase voltages and currents in a three-phase consumer network, where the values of voltages "U” and currents "1" in the network conductors are plotted along the ordinate axis, and the time “t” is the abscissa axis;
  • 5 is a timing diagram of the control of the phase shift between the phase voltage of one conductor and the total current of two other conductors, as well as the phase shift between the two total currents;
  • figb is a timing diagram of the control of the phase shift between the interphase voltage of two conductors and the total current of the same conductors relative to the selected reference point t0, synchronized with the frequency of the network, as well as the phase shift between the two total currents
  • the proposed protection device is designed to protect energy consumers from emergency operating modes - overload, underload; breaks and short circuits in the power circuits, both on the source side and on the consumer side; voltage imbalances and other violations of the operating mode in three-phase AC networks.
  • the proposed device contains: current and voltage sensors connected to phase conductors in the consumer circuit; converters of alternating voltage of sensor signals to pulse voltages; a phase shift control unit, to the inputs of which the outputs of said converters are connected; the body that responds to the control signal from the output of the phase shift control unit, as well as the disconnection unit, which directly disconnects the consumer from the network.
  • an input / output device can be connected to the phase shift control unit for inputting the necessary consumer data into the microprocessor memory and outputting data on its operating mode, as well as fixing time instants, reasons for disconnection, and other parameters.
  • phase shift measurements can be made between the current and voltage of any phase conductors in various combinations, for example, between the current of one phase and the current of another, the current and voltage of one phase, the current of one phase and voltage in the other, different voltages phases, currents of several phases relative to the current in another, etc.
  • current sensors 4, 5, 6 are connected in series to each of the conductors of the three-phase AC network 1 through the shutdown unit 2 from the consumer 3.
  • voltage sensors 7, 8 and 9 are connected to each of the conductors.
  • Sensors 4 to 9 of current and voltage can operate using any principle of operation. A general requirement is the possibility of their response to currents and voltages in the phase conductors both from the consumer 3 and from the network 1.
  • induction-type current transformers or Hall effect sensors can be used as current sensors 4-6.
  • sensors 7 - 9 voltage can be used voltage transformers, resistive, capacitive or resistive-capacitive voltage dividers, etc.
  • the information outputs of the sensors 4 to 9 are connected to the corresponding inputs of the converters 10 to 15 of an alternating voltage to pulsed, the outputs of which are connected to the information inputs of the phase shift monitoring unit 16.
  • Various threshold devices can be used as converters.
  • the phase shift control unit 16 in the most preferred embodiment can be implemented on the basis of a microprocessor. It is assumed that in the case of the implementation of a phase shift control unit based on a microprocessor, it also includes a memory device in which a program for controlling the microprocessor and the necessary data for its operation are stored.
  • control unit 16 To the output of the control unit 16 is connected by its input an element 17 for generating a trip signal (intermediate relay), made on the basis of a semiconductor device, in this case, optosimistor, the output of which is connected to the shutdown unit 2.
  • a semiconductor device in this case, optosimistor, the output of which is connected to the shutdown unit 2.
  • the device 18 input / output of controlled values, made in the form of a standalone remote control, however, this device is not required.
  • the embodiment of the device shown in FIG. 2 differs from the above in that current sensors 4 and 5 are each connected to a pair of conductors (B, C and A, B, respectively), one of which (B) is common to both sensors, and voltage sensors 7 and 8 are connected each to the third conductor (A and C, respectively) of the three-phase network.
  • the outputs of the sensors 4,5,7 and 8 through the converters 10 - 13 AC to pulsed connected to the inputs of the block 16 control the phase shift, the output of which through the element 17 of the formation of the shutdown signal is connected to the node 2 shutdown.
  • An I / O device 18 is connected to the control unit 16.
  • the embodiment of the device shown in FIG. 3, differs from the above in that the voltage sensors 7 and 8 are connected between the same conductors to which the total current sensors 4 and 5 are connected.
  • the outputs of the sensors 4,5,7 and 8 through the converters 10 - 13 AC to pulsed connected to the inputs of the block 16 control the phase shift, the output of which through the element 17 of the formation of the shutdown signal is connected to the node 2 shutdown.
  • a synchronization unit 19 is additionally introduced, the inputs of which are connected to the network conductors, and the output is connected to the synchronizing input of the control unit 16.
  • Block 19 synchronization is used to set the moment to reference time intervals in block 16 control.
  • the input / output device 18 is connected to the control unit 16.
  • the essence of the method of protecting consumers of AC energy from emergency conditions is as follows.
  • the time shifts between the voltages on the conductors and the currents in the conductors in various combinations are determined by the time points of the change in the direction of the currents in the conductors supplying the consumer (according to the signals of the sensors 4 to 6) and by the moments of the change in the polarity of the voltage (according to the signals from the sensors 7 to 9)
  • the corresponding time shifts are compared with each other, determining the current values of the phase shift, which are then compared with the boundary (limit) values of the range of permissible changes, given taking into account the maximum and minimum values of the power factor of the protected consumer.
  • the range of acceptable values of the time shift between voltage and currents is determined by the values ⁇ tmi ⁇ and ⁇ t ma ⁇ , which are established by the maximum and minimum values of the power factor (cos ⁇ ) of a particular consumer, which, in turn, can be set by the manufacturer and the nature of the consumer's work.
  • the consumer switches off (load) from the network, followed by blocking the re-inclusion for adaptive time, with fixing the time and reason for the disconnection.
  • the mentioned parameters are the minimum time, boundary values of the interval of admissible values, adaptive time are pre-recorded in the memory of the phase shift control unit 16 or input from the input / output device 18.
  • the consumer switches off 3 by the shutdown node 2, followed by a lock for the adaptive time of the consumer's repeated switching on, with a possible fixation of the time and reason for the disconnection.
  • phase shift ⁇ between phase currents and voltages, is greater than the value ⁇ max , while at the outputs of the control unit 16 there are control signals corresponding to the normal operation of the electric motor. If the rated load value is exceeded on the motor shaft, the condition ⁇ ⁇ max is met , and at the output of the control unit 16, the control signal corresponds to the trip signal.
  • the implementation of this range can be taken as a range of valid values. As already mentioned, time intervals can be measured with a very high degree of accuracy, therefore, the comparison error can be quite small, and the reliability of the protection device can be high.
  • the device can be connected as shown in FIG. 2, while the current sensor 4 controls the total current of the two phases B and C, and the current sensor 5 monitors the total current of the two phases A and B, respectively.
  • the total current of phases B and C is equal to the current of phase A with the opposite sign.
  • the parameter ⁇ t ⁇ can be measured, which should be equal to 1/3 of the period T of the network when the consumer is operating in normal mode.
  • Timing diagrams corresponding to this method of phase shift control are shown in Fig.6.
  • an arbitrary moment t0 of the start of measurements is set, which is set using the synchronization unit 19.
  • the device for protecting consumers of AC power energy from emergency operating conditions can also be used in other devices, for example, “direct fuse” devices, as a unit that directly protects the consumer's power circuits.
  • the main integral criterion for consumer protection for example, an asynchronous electric motor (transformer) is the comparison of phase shifts between currents and voltages in the supply conductors with the limit deviations established on the basis of the passport values of cs ⁇ n .
  • Additional criteria may include:
  • the shift between the phases of the flowing currents in the conductors allow: fast recognition of an emergency during the period of the current frequency; ensuring independence from the frequency of the supply network (50 Hz or another frequency) and shape (sinusoidal, triangular, rectangular) and high accuracy of measuring the power factor, because essentially time intervals are measured, which guarantees protection against false alarms.
  • the device can be used in a wide range of consumer capacities.
  • the method according to the invention protects the energy consumer essentially from all possible emergency situations in the consumer's electrical circuit.
  • the invention can be successfully used to protect induction motors and transformers from overload, underload (idle); when the voltage is distorted; a break in the supply conductors, both on the source side and on the consumer side; short circuits in power circuits and other emergency operation modes.

Landscapes

  • Emergency Protection Circuit Devices (AREA)

Abstract

La présente invention se rapporte à un procédé permettant de protéger un utilisateur d'un réseau triphasé à courant alternatif contre les dysfonctionnements. Le procédé selon l'invention consiste : à déterminer les valeurs courantes d'un déphasage entre la tension d'alimentation et le ou les courants de consommation dans au moins deux conducteurs de phase ; à comparer lesdites valeurs courantes avec des valeurs de déphasage admissibles, dans une plage déterminée en fonction des valeurs maximale et minimale du facteur de puissance (cos?) de l'utilisateur ; et à déconnecter l'utilisateur du circuit si la valeur courante est au-delà des limites de la plage donnée de valeurs admissibles. L'invention a également trait à un dispositif destiné à protéger un utilisateur contre les dysfonctionnements. Le dispositif selon l'invention comprend des capteurs de courant (4, 5, 6), des capteurs de tension (7, 8, 9), et une unité de déconnexion (2) dans les conducteurs de phase. Conformément à l'invention, le dispositif comporte également une unité de commande de déphasage (16), qui peut émettre un signal de déconnexion de l'utilisateur du réseau à courant alternatif lorsque ledit déphasage est au-delà de la plage de valeurs admissibles, et une unité de synchronisation (19), dont les entrées sont reliées aux conducteurs de phase du réseau, et dont la sortie est reliée à l'unité de commande de déphasage (16).
PCT/RU2005/000271 2005-05-18 2005-05-18 Procede permettant de proteger un utilisateur d'un reseau triphase a courant alternatif contre les dysfonctionnements, et dispositif destine a sa mise en oeuvre WO2006123962A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/RU2005/000271 WO2006123962A1 (fr) 2005-05-18 2005-05-18 Procede permettant de proteger un utilisateur d'un reseau triphase a courant alternatif contre les dysfonctionnements, et dispositif destine a sa mise en oeuvre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/RU2005/000271 WO2006123962A1 (fr) 2005-05-18 2005-05-18 Procede permettant de proteger un utilisateur d'un reseau triphase a courant alternatif contre les dysfonctionnements, et dispositif destine a sa mise en oeuvre

Publications (1)

Publication Number Publication Date
WO2006123962A1 true WO2006123962A1 (fr) 2006-11-23

Family

ID=37431483

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU2005/000271 WO2006123962A1 (fr) 2005-05-18 2005-05-18 Procede permettant de proteger un utilisateur d'un reseau triphase a courant alternatif contre les dysfonctionnements, et dispositif destine a sa mise en oeuvre

Country Status (1)

Country Link
WO (1) WO2006123962A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104393575A (zh) * 2014-10-24 2015-03-04 上海山源电子科技股份有限公司 用于煤矿低压配电保护器的相敏保护方法及其保护系统
EP4170841A1 (fr) * 2021-10-25 2023-04-26 Silergy Semiconductor Technology (Hangzhou) Ltd Procédé de détection de défaillance et dispositif de détection de défaillance

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU637890A1 (ru) * 1976-03-15 1978-12-15 Новосибирское Отделение Всесоюзного Государственного Научно-Исследовательского И Проектного Института "Вниипроектэлектромонтаж" Способ защиты от замыкани на землю контактной сети переменного тока
US4251766A (en) * 1977-02-09 1981-02-17 Enertec Method and apparatus for determining the direction of a fault on a power transmission line
SU951535A1 (ru) * 1980-10-03 1982-08-15 Новочеркасский Ордена Трудового Красного Знамени Политехнический Институт Им.Серго Орджоникидзе Устройство дл защиты трехфазных потребителей от несимметрии фазных токов
RU2027272C1 (ru) * 1990-07-23 1995-01-20 Котов Константин Владимирович Способ защиты электродвигателя от перегрузки

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU637890A1 (ru) * 1976-03-15 1978-12-15 Новосибирское Отделение Всесоюзного Государственного Научно-Исследовательского И Проектного Института "Вниипроектэлектромонтаж" Способ защиты от замыкани на землю контактной сети переменного тока
US4251766A (en) * 1977-02-09 1981-02-17 Enertec Method and apparatus for determining the direction of a fault on a power transmission line
SU951535A1 (ru) * 1980-10-03 1982-08-15 Новочеркасский Ордена Трудового Красного Знамени Политехнический Институт Им.Серго Орджоникидзе Устройство дл защиты трехфазных потребителей от несимметрии фазных токов
RU2027272C1 (ru) * 1990-07-23 1995-01-20 Котов Константин Владимирович Способ защиты электродвигателя от перегрузки

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104393575A (zh) * 2014-10-24 2015-03-04 上海山源电子科技股份有限公司 用于煤矿低压配电保护器的相敏保护方法及其保护系统
CN104393575B (zh) * 2014-10-24 2017-05-31 上海山源电子科技股份有限公司 用于煤矿低压配电保护器的相敏保护方法及其保护系统
EP4170841A1 (fr) * 2021-10-25 2023-04-26 Silergy Semiconductor Technology (Hangzhou) Ltd Procédé de détection de défaillance et dispositif de détection de défaillance

Similar Documents

Publication Publication Date Title
RU2263925C2 (ru) Устройство и способ обнаружения короткого замыкания на землю и вычисления его сопротивления
US11967916B2 (en) Load control apparatus, automation system, electrical load, busbar system and fuse housing
EP1764894A1 (fr) Procédé de détection d'une opération d'ilôtage d'un générateur dispersé
KR101759598B1 (ko) 변류기 2차 회로 개방 감지 기능을 갖는 디지털 계전기
BR112014027284B1 (pt) Arranjo para controlar um gerador síncrono, sistema gerador e sistema de energia
CN111801583A (zh) 电力系统装备的过励磁保护
Nsengiyaremye et al. Low-cost communication-assisted line protection for multi-inverter based microgrids
WO2006123962A1 (fr) Procede permettant de proteger un utilisateur d'un reseau triphase a courant alternatif contre les dysfonctionnements, et dispositif destine a sa mise en oeuvre
US7420343B2 (en) Current limiting DC motor starter circuit
US20140321176A1 (en) Systems and methods for electronic tru input protection
Ludwinek et al. Experimental analysis of assessing of the tripping effectiveness of miniature circuit breakers in an electrical installation fed from a synchronous generator set
RU2263382C2 (ru) Способ защиты потребителей энергии сети переменного тока от аварийных режимов работы и устройство для его осуществления
KR101037767B1 (ko) 활선상태에서 차단기 접점의 접촉저항의 변화를 이용한 결상 예측장치
RU2529505C1 (ru) Способ и система для отключения генератора от энергосистемы
JP6116499B2 (ja) 回路遮断器
KR20120000053U (ko) 간소화된 전력감시형 삼상기기 보호계전장치
KR101142749B1 (ko) 인버터 지락 검출 시스템 및 인버터 지락 검출 방법
JP2010273478A (ja) 直流・交流回路地絡検出方法および直流・交流回路地絡検出システム
EP3016265B1 (fr) Appareil de commande d'onduleur
Schegner Power System Protection
Ding et al. Protection and control of networks with distributed generators capable of operating in islanded mode
KR20100124898A (ko) 3상 전동기용 결상 보호 릴레이 회로 및 결상 경보 회로
Zorin et al. The Improved Voltage Control Relay For The Single-phase Household Consumers Protection
JP4202954B2 (ja) 常用発電装置の系統連系保護装置
RU2400004C1 (ru) Устройство для защиты трехфазного электродвигателя от неполнофазного режима

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: RU

122 Ep: pct application non-entry in european phase

Ref document number: 05817820

Country of ref document: EP

Kind code of ref document: A1