RU2372624C1 - Method for detection of single-phase earth fault location in ramified overhead power transmission line, method for detection of phase-to-phase short circuit in ramified overhead power transmission line and device for current and voltage monitoring for their realisation - Google Patents

Method for detection of single-phase earth fault location in ramified overhead power transmission line, method for detection of phase-to-phase short circuit in ramified overhead power transmission line and device for current and voltage monitoring for their realisation Download PDF

Info

Publication number
RU2372624C1
RU2372624C1 RU2008109491/28A RU2008109491A RU2372624C1 RU 2372624 C1 RU2372624 C1 RU 2372624C1 RU 2008109491/28 A RU2008109491/28 A RU 2008109491/28A RU 2008109491 A RU2008109491 A RU 2008109491A RU 2372624 C1 RU2372624 C1 RU 2372624C1
Authority
RU
Russia
Prior art keywords
current
voltage
phase
microcontroller
global positioning
Prior art date
Application number
RU2008109491/28A
Other languages
Russian (ru)
Other versions
RU2008109491A (en
Inventor
Рустэм Газизович Хузяшев (RU)
Рустэм Газизович Хузяшев
Игорь Леонидович Кузьмин (RU)
Игорь Леонидович Кузьмин
Original Assignee
Рустэм Газизович Хузяшев
Игорь Леонидович Кузьмин
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 Рустэм Газизович Хузяшев, Игорь Леонидович Кузьмин filed Critical Рустэм Газизович Хузяшев
Priority to RU2008109491/28A priority Critical patent/RU2372624C1/en
Publication of RU2008109491A publication Critical patent/RU2008109491A/en
Application granted granted Critical
Publication of RU2372624C1 publication Critical patent/RU2372624C1/en

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

FIELD: electricity.
SUBSTANCE: invention is related to maintenance of overhead power transmission lines (PTL) with ramified structure and may be used for automated detection of single-phase earth fault location in networks with isolated neutral. Method is based on registration of time of phase voltage surge with current and voltage monitoring devices, number of which is more than number of controlled branches by one, in a single time scale, synchronised from satellite signals of global positioning signals. Fixed moments of time are sent to dispatcher centre for joint processing, where a damaged branch is identified, as well as point of damage with the help of a difference-distance method for each pair of time moments registered with current and voltage monitoring devices. Device for current and voltage monitoring in PLT wire comprises supplying and metering current transformers, voltage detector, supply unit, microcontroller, radio modem, receiver of satellite signals from global positioning system. Supplying current transformer is connected to supply unit, metering current transformer via resistive load is connected to microcontroller, as well as voltage detector, radio modem and receiver of satellite signals from global positioning system.
EFFECT: higher speed and convenience of damaged point detection.
2 cl, 1 dwg

Description

The invention relates to the maintenance of a branched power line (power transmission line) with current and voltage control devices and can be used to determine the location of a single-phase earth fault in a power transmission line with isolated neutral and interphase short circuit in a power transmission line of any voltage class.

A known method of determining the location of a single-phase earth fault in a branched overhead power line with isolated neutral, based on the use of active pulse location of the damage site with recording the time of arrival of the reflected probe pulses from the heterogeneity in the line (Analytical review. Methods and apparatus for determining the location of damage in electrical networks. - Kazan : IC Energoprogress, a branch of OAO Tatenergo, 2002. P.40). When it is used in a branched electric network, the trace of the emergency line is compared with the trace obtained with a working power line.

The disadvantage of this method is the inability to allocate a specific branch of the electrical network in which the damage occurred.

There is a method of determining the location of damage to power lines of distribution networks according to the patent of the Russian Federation No. 2292559, IPC 2007 - a prototype in which probing pulses with different filling frequencies are used and the arrival time of the leading edge of the reflected pulses is analyzed. The pulse filling frequency (fm) is determined by the amplitude-frequency characteristics k (f) of the power transformers included in each branch of the distribution networks, based on the conditions

km (fm) = 0,

ki (fm) ≠ 0 for i = 1 ÷ n; i ≠ m, m = 1 ÷ n,

where n is the number of branches, and i is the number of the branch in which the line was damaged, is determined by the presence in all reflectograms of the reflected pulse with the same delay time and the absence of the reflected pulse with the filling frequency (fi) from the i-th power transformer corresponding to i- th branch.

The disadvantage of this method is the need for a preliminary study of power transformers installed at the end of each branch.

A common drawback of the considered location methods is that they are difficult to automate, they all require servicing by qualified personnel.

There is a method of determining the location of a single-phase earth fault in a branched overhead power line with an isolated neutral (Kuznetsov A.P. Determining the places of damage on overhead power lines. - M .: Energoatomizdat, 1989. P. 94), in which using electric and magnetic sensors Fields record an alarm containing harmonic components. The eleventh harmonic is extracted from the alarm signal, the harmonic components of the voltage and current signals are amplified and fed to the phase-comparing circuit, and depending on whether the current and voltage signals are out of phase or coincide, the milliammeter arrow deviates to the left or right with zero in the middle of the scale, indicating direction to earth fault. The harmonic components of the voltage and current alarms are recorded by non-contact measurement at different points, moving under the overhead power line along its branches.

The disadvantage of this method is the need to move the emergency crew along all branches of the overhead power line and the inability to determine the location of the interphase short circuit due to its short duration.

A known method of determining the location of a single-phase earth fault in a branched overhead power line with isolated neutral according to the patent of the Russian Federation No. 2285883, IPC G01R 31/08, 2005, which is an improvement of the previous method in terms of comparative analysis of harmonic amplitudes. From the alarm signal obtained by non-contact measurement of the harmonic components of voltage and current signals by the mobile method at different points, moving under the overhead power line along its branches, after the signals are expanded in the Fourier series, a harmonic with the total amplitude of the electric and magnetic fields is greatest relative to the normal mode. A damaged branch is determined by the maximum value of the total amplitude of the electric and magnetic fields of the selected harmonic. The place of damage is determined by changing the sign of the phase difference of the electric and magnetic fields of the selected harmonic.

The disadvantage of this method is the need to move the emergency crew along all branches of the overhead power line and the inability to determine the location of the interphase short circuit due to its short duration.

Using the "Quantum" device (Technical description. - M .: Scientific-Production Firm "Radius", 2004) a simpler algorithm is implemented for determining the place of a single-phase earth fault in a branched overhead power line with isolated neutral selected for the prototype. Consistently, bypassing the power line with the Quantum portable device, at all points of the bypass, only the total amplitude of the higher harmonics of the current near the frequency of 550 Hz is recorded. Use the property of the higher harmonics of the current generated in the place of a single-phase earth fault to close to earth through the capacitance of the substation busbars. Thus, during a sequential bypass of a power transmission line from its beginning to the end of a damaged branch, the place of a single-phase earth fault is defined as the point at which the measured sum of the amplitudes of the higher harmonics is much smaller than at previous points.

The disadvantage of this method is the need to move the emergency crew along the overhead power line and the inability to determine the location of the interphase short circuit due to its short duration.

A device is known for remote monitoring of the state of an overhead power line wire (RF patent No. 2222858, IPC H02J 13/00, 2004), which comprises a housing and a power unit and a measuring and transmitting module located in the housing. Embodiments of the invention include introducing into the measuring and transmitting module a means of interfacing with a public cellular telephony channel and / or a signal receiver of a global positioning system with a determinant of its position in a three-dimensional coordinate system.

The disadvantages of the prototype are the need to use paid channels of public cellular telephony, as well as the use of periodically replaced power sources in the power supply.

The device for monitoring electric power systems selected as a prototype (RF patent No. 2143165, IPC H02J 13/00, G01R 15/06, 1999) contains a high-voltage measuring module connected to a high-voltage network, including a passive network current transducer magnetically coupled to the high-voltage network with a resistor load and / or a passive line voltage converter electrically connected to the high-voltage network. The high-voltage measuring module further comprises a secondary power supply unit based on a periodically replaced battery, including a rectifier bridge, a zener diode and a diode, to which a low-voltage supply current transformer and / or electrically connected to the high-voltage network and connected to the passive circuit are magnetically coupled to the high-voltage network mains voltage converter, low-voltage supply voltage transformer, active measuring information signal converter and based on a microcontroller connected to a passive network current converter and / or a passive network voltage converter and a secondary power supply unit and having radio frequency and / or optical outputs for the converted measurement information signals.

The disadvantages of the device are the use of a low-voltage supply voltage transformer with a grounded output, which increases the cost of the device and reduces the reliability of its operation, the need to create and operate a high-frequency communication system for transmission to the collection point of measurement information, as well as the use of periodically replaced batteries in the power supply.

The objective of the invention is to increase the speed and convenience of determining the location of damage in a branched overhead power line.

The technical result is achieved by the fact that in the method for determining the location of a single-phase earth fault in a branched overhead power line with an isolated neutral, by which the arrival time of the leading edge of the pulse is recorded, at the beginning of the power line and at the end of each branch, devices for monitoring current and voltage are installed on the wires of the high voltage power line, the number of which is one more than the number of controlled branches, as the leading edge of the pulse use a phase voltage jump that occurs at the fault location during a single-phase closure and to the ground, simultaneously, with all devices, they record the time of the voltage jump in a single time scale, synchronized from satellite signals of the global positioning system, transfer them to a control center for automatic processing, where for fixed times from each pair of current and voltage control devices in the differential-ranging method determine the damaged branch, and for fixed times from a pair of current and voltage control devices, one of which is on the damaged branch, different the rest-range method determines the location of damage on this branch.

The technical result is achieved by the fact that in the method for determining the location of an interphase short circuit in a branched overhead power line, by which an alarm is recorded at different points of the power line, the damage location is determined by joint processing of the measurements, as the point of the emergency current path that is farthest from the beginning of the power line, in at different points of the power lines, devices for monitoring current and voltage are installed on the wires of the high-voltage power lines, and the amplitude of the main harmonic of the current is used as an alarm signal, pre ysivshuyu set threshold, and sends the number of triggered devices to the control center for their automated processing.

The technical result is achieved by the fact that in the current and voltage control device, which contains a measuring module connected to the high voltage network, including a current transformer magnetically connected to the high voltage network with a resistor load, and a secondary power supply unit based on a rectifier bridge, a zener diode and a diode . A low-voltage current transformer magnetically connected to the high-voltage network is connected to the secondary power supply unit, an active transducer of measurement information signals based on a microcontroller is connected to a current measuring transformer and a secondary power supply unit, the power supply unit is additionally equipped with an ionistor and a pulse stabilizer, and an electric sensor is additionally introduced into the device fields, the satellite signal receiver of the global positioning system and the radio modem are unlicensed frequency range with relay mode, while the output of the supply current transformer is connected to the input of the rectifier bridge, the output of which is connected to the cathode of the zener diode and the anode of the diode, the cathode of which is connected to the positive terminal of the ionistor and the input of the pulse voltage regulator, the output of the pulse voltage regulator is connected to the power supply inputs microcontroller, radio modem and satellite receiver of global positioning system, output resistor load measuring transformer a current input connected to the analog-digital converter of the microcontroller, the electric field sensor is connected to the analog input of the microcontroller, a microcontroller, a radio modem and a satellite receiver of global positioning system associated channel asynchronous serial data transmission, satellite signal receiver synchronization signal output connected to an input of the microcontroller.

In addition, the power supply unit of the inventive device can be equipped with a means of recharging from an additionally introduced solar battery. This allows you to further increase the reliability of the battery life of the device.

The drawing shows a block diagram of a device for monitoring current and voltage.

The inventive device consists of a supply current transformer 1, the primary winding of which is a rectilinear phase wire of a high voltage power line, which is connected by a secondary winding to a diode rectifier bridge 2, a zener diode 3, a diode 4, and an ionistor 5. The ionistor is connected to the input of a pulse stabilizer 6, the output of which is connected with a microcontroller 7 and a radio modem 8. A measuring current transformer 9 is connected through the load resistance 10 to the input of the analog-to-digital converter of the microcontroller 7. The electric field sensor 11 is connected to the analog input of the microcontroller. The microcontroller 7, the radio modem 8 and the output of the synchronization signals of the receiver 12 of the satellite signals of the global positioning system are connected by a serial asynchronous data transmission channel.

The use of ionistors is determined by the fact that in terms of specific power they occupy an intermediate position between chemical current sources and electrolytic capacitors, but unlike chemical current sources, they have a wider temperature range of operation (maintain their operability at low temperatures) and a greater number of charge-discharge cycles .

The inventive methods are as follows.

The current and voltage control devices installed at the selected points of the power lines on the same phase wires or all phase wires at the same time upon the occurrence of either a voltage surge or exceeding the amplitude of the main harmonic of the phase current of the set threshold, record either the time of the voltage jump in a single time scale or the amplitude of the main harmonic current. The parameters of the registered signals using the relay mode of the radio modems are transmitted to the dispatch center, where they are automatically processed. The place of damage is determined either by the differential-ranging method or by the amplitude of the fundamental current harmonic.

The method for determining the location of a single-phase earth fault in a branched overhead power line with an isolated neutral is carried out by a passive multilateral (at the beginning of the power line and at the end of each branch) location of the alarm signal using current and voltage control devices supplemented by a satellite receiver of global positioning system signals. The devices are installed at the beginning of an overhead power line and at the end of each branch. The transit time of the front of the voltage surge generated during a single-phase earth fault is measured through the location of each device in a single time scale, which is transmitted to the control room, where they are jointly processed by the differential-ranging method. For any pair of devices whose location is known in advance, we have recorded times of the passage of the voltage jump front Ti and Tj, based on which we compose the equations Ti = x / c and Tj = (Li + Lj + Pij-x) / c, where c is the velocity propagation of a voltage jump along a power line (close to the speed of light), x is the distance from the place of damage to the i-th device, Lj is the length of the j-th branch, Pij is the distance between the beginning of the i-th and j-th branches along the trunk line, joint solution of the equations determines the distance to the place of damage or to the start of the branch, where damage occurred, as x = (Li + Lj + Pij-c * (Ti-Tj)) / 2, and enumeration of all possible pairs of devices allows to reduce the error in determining the location of damage.

A method for determining the location of an interphase short circuit in a branched overhead power line is carried out by automatically determining the emergency current flow path using current and voltage control devices in the high voltage power line wire. Current and voltage control devices installed on phase conductors at branch points or more often operate automatically to measure emergency current parameters. The start signal for starting measurements of each current and voltage control device is the fixing of an alarm, which for an interphase short circuit is an excess of the phase current of a predetermined threshold. The device number is transmitted to the control room. The information collected in the control room from all sensors is jointly processed and the damaged branch is determined as a branch on which a phase current with an amplitude exceeding the set threshold is recorded, the location of the power line damage is defined as the area between adjacent sensors on the branch that recorded and did not record the excess of the phase current amplitude set threshold.

The device operates as follows. When current flows through the phase conductor, the supply current transformer 1 converts it in magnitude, the rectifier bridge 2 converts the current into direct current and charges the ionistor 5 with this current, the energy of which can be consumed for short-term operation of the microcontroller 7, radio modem 8 and satellite receiver 12 of the global positioning system signals as in normal and emergency modes. Zener diode 3 protects the ionistor from exceeding the voltage on it above the nominal value, and diode 4 protects the ionistor 5 from discharge through the input circuit. The pulse stabilizer 6 converts the changing constant voltage on the ionistor into the stabilized voltage necessary for the operation of the microcontroller 7, the radio modem 8 and the receiver 12 of the satellite signals of the global positioning system. Measuring current transformer 9 using a load resistance 10 creates a voltage proportional to the current value, which is sampled by time and digitized using a timer and an analog-to-digital converter, which are part of the microcontroller 7. An electric field sensor 11 connected to the input of the analog-to-digital converter of the microcontroller 7, measures the voltage on the phase wire. The measured current and voltage parameters are sent to the radio modem 8 for transmission to the central point using relay through the radio modems of neighboring current and voltage control devices. The receiver 12 of the satellite signals of the global positioning system receives accurate time signals, according to which the microcontroller determines the transit time of the voltage jump during a single-phase earth fault.

Simultaneous fixing of the alarm signal before the power supply is disconnected from the power transmission line by current and voltage control devices in the overhead power transmission line and the joint processing of the measurement results by the proposed methods makes it possible to quickly and easily determine the location of damage.

The use of new elements in the current monitoring device can increase the reliability of the device, reduce its cost by eliminating the voltage transformer and replacing it with an electric field sensor, reduce the cost of its maintenance by using an ionistor, an unlicensed radio frequency mode with a relay mode and eliminating the use of paid radio channels and cellular telephony, and apply the proposed methods for determining the location of damage. The inventive device for monitoring current and voltage allows you to automate the method of determining the location of a single-phase earth fault in a branched power transmission line with an isolated neutral, based on the registration of higher harmonics of the current.

Claims (2)

1. The method of determining the location of a single-phase earth fault in a branched overhead power line with an isolated neutral, which consists in fixing the arrival time of the leading edge of the pulse, characterized in that at the beginning of the power line and at the end of each branch, current control devices are installed on the wires of the high voltage power line and voltages, the number of which is one more than the number of monitored branches, use a phase voltage jump as pulses; simultaneously, all devices record the transit time of the phase voltages in a single time scale synchronized from satellite signals of the global positioning system transmit the registered times to the control center for their automatic processing, where for the fixed times from each pair of current and voltage control devices, the damaged branch is determined by the differential-ranging method, and for fixed times from pairs of current and voltage control devices, one of which is located on the damaged branch, determine the location of the damage by the differential-range measuring method on this thread.
2. A device for monitoring current and voltage, comprising a measuring module connected to a high-voltage network, including a current transformer magnetically connected to a high-voltage network with a resistor load, and a secondary power supply unit based on a rectifier bridge, a zener diode, and a diode, and to the block secondary power supply are connected magnetically connected to a high-voltage network, a low-voltage supply current transformer, an active transducer of measurement information signals based on micro a scooter connected to a current measuring transformer and a secondary power supply unit, characterized in that the power supply unit is additionally equipped with an ionistor and a pulse stabilizer, and an electric field sensor, a satellite receiver of global positioning system signals and an unlicensed frequency range with relay mode are additionally introduced into the device, with the output of the supply current transformer is connected to the input of the rectifier bridge, the output of which is connected to the cathode of the zener diode and the anode ohm of the diode, the cathode of which is connected to the positive terminal of the ionistor and the input of the pulse voltage regulator, the output of the pulse voltage regulator is connected to the power inputs of the microcontroller, the radio modem and the satellite receiver of the global positioning system, the output of the resistive load of the current measuring transformer is connected to the input of the analog-to-digital converter of the microcontroller, the electric field sensor is connected to the analog input of the microcontroller, microcontroller, radio modem and the receiver of satellite signals of the global positioning system is connected by a serial asynchronous data transmission channel; the output of the synchronization signals of the satellite signal receiver is connected to the input of the microcontroller.
RU2008109491/28A 2008-03-12 2008-03-12 Method for detection of single-phase earth fault location in ramified overhead power transmission line, method for detection of phase-to-phase short circuit in ramified overhead power transmission line and device for current and voltage monitoring for their realisation RU2372624C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2008109491/28A RU2372624C1 (en) 2008-03-12 2008-03-12 Method for detection of single-phase earth fault location in ramified overhead power transmission line, method for detection of phase-to-phase short circuit in ramified overhead power transmission line and device for current and voltage monitoring for their realisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2008109491/28A RU2372624C1 (en) 2008-03-12 2008-03-12 Method for detection of single-phase earth fault location in ramified overhead power transmission line, method for detection of phase-to-phase short circuit in ramified overhead power transmission line and device for current and voltage monitoring for their realisation

Publications (2)

Publication Number Publication Date
RU2008109491A RU2008109491A (en) 2009-09-20
RU2372624C1 true RU2372624C1 (en) 2009-11-10

Family

ID=41167427

Family Applications (1)

Application Number Title Priority Date Filing Date
RU2008109491/28A RU2372624C1 (en) 2008-03-12 2008-03-12 Method for detection of single-phase earth fault location in ramified overhead power transmission line, method for detection of phase-to-phase short circuit in ramified overhead power transmission line and device for current and voltage monitoring for their realisation

Country Status (1)

Country Link
RU (1) RU2372624C1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2455654C1 (en) * 2011-01-24 2012-07-10 Государственное образовательное учреждение высшего профессионального образования "Казанский государственный энергетический университет" (КГЭУ) Method for identification of damaged section and nature of damage within electric power grid of ramified topology
RU2516299C2 (en) * 2009-12-10 2014-05-20 Абб Текнолоджи Аг Line damage detector
RU2521790C1 (en) * 2013-01-29 2014-07-10 Александр Леонидович Куликов Method for determining damaged point of branched power transmission lines
RU2532760C1 (en) * 2013-04-05 2014-11-10 Александр Леонидович Куликов Method for determining damaged point of branched power transmission line
RU2555195C1 (en) * 2014-04-08 2015-07-10 Александр Леонидович Куликов Power line fault localisation method
RU2578726C1 (en) * 2014-10-29 2016-03-27 Рустэм Газизович Хузяшев Method of determining phase voltage, surface resistance and leak current for linear suspended insulator of overhead transmission line and device therefor
RU2639715C1 (en) * 2016-09-22 2017-12-22 Рустэм Газизович Хузяшев Method for determining places of damage of branched overhead transmission line in form of ice deposit on cables
RU2700294C1 (en) * 2018-12-19 2019-09-16 Общество с ограниченной ответственностью "НПП Бреслер" (ООО "НПП Бреслер") Method of determining point of damage of power transmission line and device for its implementation
RU2733825C1 (en) * 2020-03-31 2020-10-07 Общество с ограниченной ответственностью «ТРИНИТИ ИНЖИНИРИНГ» (ООО «ТРИНИТИ ИНЖИНИРИНГ») Method of determining fault location of cable and overhead power transmission lines

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2516299C2 (en) * 2009-12-10 2014-05-20 Абб Текнолоджи Аг Line damage detector
RU2455654C1 (en) * 2011-01-24 2012-07-10 Государственное образовательное учреждение высшего профессионального образования "Казанский государственный энергетический университет" (КГЭУ) Method for identification of damaged section and nature of damage within electric power grid of ramified topology
RU2521790C1 (en) * 2013-01-29 2014-07-10 Александр Леонидович Куликов Method for determining damaged point of branched power transmission lines
RU2532760C1 (en) * 2013-04-05 2014-11-10 Александр Леонидович Куликов Method for determining damaged point of branched power transmission line
RU2555195C1 (en) * 2014-04-08 2015-07-10 Александр Леонидович Куликов Power line fault localisation method
RU2578726C1 (en) * 2014-10-29 2016-03-27 Рустэм Газизович Хузяшев Method of determining phase voltage, surface resistance and leak current for linear suspended insulator of overhead transmission line and device therefor
RU2639715C1 (en) * 2016-09-22 2017-12-22 Рустэм Газизович Хузяшев Method for determining places of damage of branched overhead transmission line in form of ice deposit on cables
RU2700294C1 (en) * 2018-12-19 2019-09-16 Общество с ограниченной ответственностью "НПП Бреслер" (ООО "НПП Бреслер") Method of determining point of damage of power transmission line and device for its implementation
RU2733825C1 (en) * 2020-03-31 2020-10-07 Общество с ограниченной ответственностью «ТРИНИТИ ИНЖИНИРИНГ» (ООО «ТРИНИТИ ИНЖИНИРИНГ») Method of determining fault location of cable and overhead power transmission lines

Also Published As

Publication number Publication date
RU2008109491A (en) 2009-09-20

Similar Documents

Publication Publication Date Title
US9627881B2 (en) Fault detection in electric power delivery systems using underreach, directional, and traveling wave elements
US10222409B2 (en) Method and system for detecting and locating single-phase ground fault on low current grounded power-distribution network
CN102937675B (en) The method of work of Real-time Electrical Distribution Network Data collection and fault location system
US10090664B2 (en) Time-domain directional line protection of electric power delivery systems
US9002672B2 (en) Method and system for time synchronization of phase of signals from respective measurement devices
CN105051996B (en) Equipment for protecting electrical network
Saha et al. Fault location on power networks
CN101706527B (en) Method for detecting arc faults based on time-frequency characteristics of high-frequency current component
US4794327A (en) Electrical parameter sensing module for mounting on and removal from an energized high voltage power conductor
US4886980A (en) Transmission line sensor apparatus operable with near zero current line conditions
EP1574822B1 (en) Device for telemonitoring the state of aerial power lines
US10393777B2 (en) Method and apparatus for monitoring power grid parameters
US4808917A (en) Transmission line sensor apparatus operable with near zero current line conditions
US8786292B2 (en) Power conductor monitoring device and method of calibration
CN108028529B (en) Time domain line protection for power transmission systems
US9482699B2 (en) Method and apparatus for monitoring high voltage bushings safely
CN102707190B (en) Direct-current-side short-circuit fault distance measuring device and method of metro tractive power supply system
US8861155B2 (en) High-impedance fault detection and isolation system
US10261119B2 (en) Smart sensor network for power grid health monitoring
CN101846718B (en) Single-phase earth fault location system for distribution network of power system and method thereof
CN103792508A (en) Error test system and method for digitized metering device
KR101171027B1 (en) An on-line monitoring system for power facilities and its method using circuit parameter measuring
CN103389441B (en) The Fault Detection And Location System of power circuit
CA2759045C (en) Overhead power line monitor
CN102053203A (en) Detection method and device for high-voltage power quality

Legal Events

Date Code Title Description
MM4A The patent is invalid due to non-payment of fees

Effective date: 20110313

NF4A Reinstatement of patent

Effective date: 20121110

QB4A Licence on use of patent

Free format text: LICENCE

Effective date: 20130517