CN2682427Y - Transmission network fault location device based on travelling wave time deviation - Google Patents
Transmission network fault location device based on travelling wave time deviation Download PDFInfo
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- CN2682427Y CN2682427Y CN 200320124005 CN200320124005U CN2682427Y CN 2682427 Y CN2682427 Y CN 2682427Y CN 200320124005 CN200320124005 CN 200320124005 CN 200320124005 U CN200320124005 U CN 200320124005U CN 2682427 Y CN2682427 Y CN 2682427Y
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Abstract
The utility model discloses a transmission network fault location device based on traveling wave time deviation. The earth line of any capacitive equipment in each substation of the transmission network is sheathed with a core type sensor based on traveling wave or the triangle side wall of the opening of a voltage mutual inductor is merged with a dividing potential drop type sensor based on traveling wave to acquire the abrupt change signals of the transmission network and record the accurate time of the occurrence of each abrupt change signal; the arrival instant of the recorded abrupt change signals of each substation is collected by a position computer; the position computer calculates the physical length of non-faulty lines and the exact position of trouble points, at the same time, a wave transformation module converts a bus-bar three-phase voltage waveform into square-wave output which is transferred to an advanced module, which can be used in measurement of the phase angle of the transmission network. The utility model is simple in structure, stable and reliable; high accuracy position system of the network defections can be implemented.
Description
Technical field
The utility model relates to protecting electrical power system field and High-Voltage Testing Technology field, particularly a kind of power transmission network fault locator based on the row ripple time difference.
Background technology
The accurate location of power transmission network position of failure point can not get solving preferably for a long time, directly influences the service restoration time of faulty line, has brought white elephant also for circuit operation maintenance personnel.The existing fault localization method comprises: utilize the fault steady-state quantity the conventional fault localization method, utilize the functional failure travelling wave positioning method of fault transient travelling wave.
Based on the Fault Locating Method of fault steady-state quantity, install at the power circuit two ends that current transformer and capacitance type potential transformer carry out electric current, the voltage steady-state quantity detects, utilize the fault steady-state quantity after the line fault to calculate fault impedance etc., find the solution fault distance.This method localization of fault precision is lower, is subjected to the influence of factors such as variation of system operational parameters bigger, comprising: the influence of the progress of disease characteristic of (1) voltage, current transformer; (2) be subjected to the adjust influence of error of line parameter circuit value and systematic parameter; (3) line parameter circuit value is with the influence of factors vary such as weather, the operation time limit, contaminated degree; (4) be subjected to the fault transient influence of harmonic.Usually the conventional fault locating device based on the fault steady-state quantity moves unsatisfactory at the scene.The application for a patent for invention that 02115506.2 of application number is called " failure point of power transmission line localization method and device " discloses the little reactance that a kind of utilization is connected in series on transformer station's capacity cell, extract the method that travelling wave signal carries out localization of fault; Above-mentioned two kinds of methods need change the wiring of system high pressure equipment, are unfavorable for safe operation of power system, are difficult to promote in the electric system of China.Application number: 00131128.X is by name: the patent of invention of " protecting power transmission line and be used for the traveling wave sensor of this method "; disclose a kind of on the CVT ground wire socket one traveling wave sensor; the capable ripple of record trouble carries out the method for localization of fault time of arrival; this system complex; mounting points is only selected CVT, is subjected to certain limitation.
The utility model content
The purpose of this utility model provide a kind of simple in structure, bearing accuracy is high based on the power transmission network fault locator of the row ripple time difference.
For achieving the above object, the utility model comprises:
The partial pressure type traveling wave sensor is connected to voltage transformer (VT) open-delta winding, is used to detect the jump signal of voltage transformer (VT) open-delta winding voltage;
The second radioshielding cable couples partial pressure type traveling wave sensor and preposition module, is used for the output signal of partial pressure type traveling wave sensor is delivered to the input end of preposition module;
Preposition module, its input end and the second radioshielding cable couple, and are used to carry out jump signal and detect, and the variation steepness and the size of measuring-signal become the wave head of fault traveling wave signal the pulse signal of certain amplitude, certain width;
The GPS timing module, the output terminal of its input end and preposition module couples, and is used to lock the output pulse signal sudden change absolute time constantly of preposition module;
Communication module couples with GPS timing module, position computer respectively, is used for the row ripple is delivered to position computer time of arrival;
Position computer is used for the signal that the received communication module sends, and finishes localization of fault calculating, demonstration and printing function.
Above-mentioned power transmission network fault locator based on the row ripple time difference also comprises:
The core-theaded type traveling wave sensor is socketed on the electrical network capacitive equipment ground wire, is used for the jump signal of earth current on the detection of grid capacitive equipment ground wire;
The first radioshielding cable couples core-theaded type traveling wave sensor and preposition module, is used for the output signal of core-theaded type traveling wave sensor is delivered to the input end of preposition module.
The utlity model has following advantage:
(1) localization method can be used for the localization of fault of loop line, without high-speed a/d, but utilizes hardware circuit to determine that directly row involves time of arrival, and the structure that makes system has reduced cost for simplifying;
(2) the core-theaded type traveling wave sensor is made up of individual layer coiling 5-50 circle coil on the annular high frequency ferrite iron core, and be installed in the ring shielding box of making opening by nonmagnetic substance, coil output connects Transient Voltage Suppressor and voltage divider, and voltage dependent resistor (VDR) in parallel, control output voltage are below 10-500V on the voltage divider output resistance; The core-theaded type traveling wave sensor can suppress power frequency component, only transmits the above high frequency jump signal of 10KHz; Core-theaded type traveling wave sensor and primary equipment do not have direct electrical communication, are not connected in series any components and parts during installation on substation operation equipment ground line, can not produce any influence to Operation of Electric Systems;
(3) voltage transformer (VT) open-delta winding exchanges output, and the partial pressure type traveling wave sensor can obtain the jump signal of electrical network like this, has improved bearing accuracy, positioning error＜120m of the present utility model;
(4) first and second radioshielding cable all adopts double shield structure, two single shielded cables are contained in the big cable inside of one deck shielding, the signal wire two ends connect sensor and preposition module respectively, the internal layer shielding links to each other with the ground of preposition module, outer shielding links to each other with the ground of sensor, improves the antijamming capability of travelling wave signal transmission;
(5) three-phase voltage signal of bus-bar potential transformer output is behind waveform transformation module converts square wave, be input to preposition module, can recording voltage waveform zero passage constantly absolute time, whether normal, also can be used for the phase angle measurement of line voltage vector if being used for the operation of detection failure locating device.
Description of drawings
The structured flowchart of Fig. 1 the utility model embodiment.
Fig. 2 core-theaded type traveling wave sensor and wiring thereof.
Fig. 2 (a) is the structural representation of the shielding box of core-theaded type traveling wave sensor among Fig. 2.
Fig. 3 partial pressure type traveling wave sensor and wiring thereof.
Fig. 4 field experiment test of the present utility model main electrical scheme.
Fig. 5 high resistance earthing fault experiment traveling wave sensor output waveform.
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Structure of the present utility model is made up of position computer 1, communication module 2, GPS timing module 3, preposition module 4, the first radioshielding cable 5, core-theaded type traveling wave sensor 6, the second radioshielding cable 7, partial pressure type traveling wave sensor 8, waveform transformation module 9 etc. as shown in Figure 1.Be socketed on capacitive equipment (condenser type current transformer CT end screen, bushing shell for transformer end screen, the wall bushing end screen etc.) ground wire core-theaded type traveling wave sensor 1 the fault traveling wave wave head accurately, no time delay be transformed into signal below the 10-500V, deliver to the input end of preposition module 4 through the first radioshielding cable 5; The partial pressure type traveling wave sensor 8 that is connected voltage transformer (VT) open-delta winding simultaneously also the fault traveling wave wave head accurately, no time delay be transformed into signal below the 10-500V, deliver to the input end of preposition module 4 through the second radioshielding cable 7; Preposition module 4 is carried out jump signal and is detected, the wave head of fault traveling wave signal is become the pulse signal of certain amplitude, certain width, output to high accurate GPS timing module 3, lock pulse sign mutation absolute time constantly, high accurate GPS timing module 3 adopts extensive Programmable Logic Device FPGA to realize, the time service precision of GPS dash receiver output is not less than 1pps (the one second pulsatile once) signal of 50ns and the constant-temperature crystal oscillator signal of 100MHz is compared, produces resolution and reach the high precision clock of 10ns error less than 100ns.The row ripple is delivered to position computer 1 by communication module 2 time of arrival, and position computer 1 is finished functions such as localization of fault calculating, demonstration and printing; Exchanges data between communication module 2 and the position computer 1 can be passed through arbitrary media implementation in optical fiber/microwave/carrier wave/telephone wire.Waveform transformation module 9 is that square wave outputs to preposition module 4 with bus three-phase voltage waveform transformation, measures three-phase voltage waveform pass zero point absolute time in real time, carries out phase angle by the mistiming of circuit two ends measurement and calculates.
Above-mentioned position computer 1 is finished localization of fault computation process: during the non-fault of (1) circuit AB, and the jump signal difference time of arrival Δ T that utilizes circuit both sides A of transformer station and B to measure
0=| t
A0-t
B0| and row ripple transmission speed V, the physical length of accurately demarcating this circuit:
L
AB＝ΔT
0·V
V is near the light velocity, and desirable 2.98 * 10
8M/s;
(2) during circuit AB fault, fault produces the initial wave head of row ripple to propagate to the circuit both sides near light velocity V, and arriving A, B both sides transformer station's time is t
A, t
BThen the trouble spot is apart from A lateral extent L
AFor:
L
A＝[ΔT
0+(t
A-t
B)]V/2
As shown in Figure 2, the core-theaded type traveling wave sensor is by individual layer coiling 5-50 circle coil on the annular high frequency ferrite iron core, the voltage divider that coil N output meets Transient Voltage Suppressor TVS and is made of R1 and R2, voltage divider output resistance R2 goes up voltage dependent resistor (VDR) Ym in parallel, the restriction output voltage is below 10-500V, coil N voltage divider and cablebreak impedance matching, that is: R1//R2=Zc, Zc is the impedance of radioshielding cablebreak.The core-theaded type traveling wave sensor is installed in one and is made in the ring shielding box of opening by nonmagnetic substance (aluminium, copper, stainless steel), and its structure is shown in Fig. 2 (a), and 11 is the ring shielding box among the figure, and 12 is iron core, and 13 is coil; The core-theaded type traveling wave sensor can suppress power frequency component, only transmits the above high frequency jump signal of 10KHz, and tf is as follows for sensor output time delay Δ: as electric current wave head time tf＜0.5 μ s, and output voltage wave head time delay Δ tf=50ns; As electric current wave head time 0.5 μ s＜tf＜=5 μ s, output voltage wave head time delay Δ tf＜15%tf.The time delay Δ is the output voltage wave head time to subtract the electric current wave head time, and tf is the electric current wave head time.
During installation, core-theaded type traveling wave sensor 6 does not have direct current potential with primary equipment gets in touch, and the components and parts of serial connection any inductance, electric capacity or its combination on substation operation equipment ground line can not produce any influence to Operation of Electric Systems.As shown in Figure 3, the partial pressure type traveling wave sensor is connected on the voltage transformer (VT) open-delta winding, and resistance R 1 and R2 constitute voltage divider, and dividing potential drop output resistance R2 two ends are parallel with voltage dependent resistor (VDR) Ym, Transient Voltage Suppressor TVS.For the former limit A of high pressure, B, the voltage that C three is symmetrical, voltage transformer (VT) open-delta winding output voltage is 0, and any asymmetric voltage, the open-delta winding always has output voltage.The fault of power transmission network is single-phase fault more than 80%, and the voltage on the former limit of high pressure is that fault transient voltage or fault steady state voltage all are that three-phase is asymmetric.Three-phase fault is different, and its fault steady state voltage is three symmetrical, but since three-phase fault form by the single-phase fault development.There is the time difference in the moment that fault takes place.Therefore, during three-phase fault fault transient voltage especially start-up portion but be three asymmetric.Like this, single-phase fault no matter, two phase faults, or three-phase fault.Fault traveling wave always three-phase is asymmetric.The open-delta winding must have the voltage jump output of reflection fault traveling wave, adopts the high-frequency resistance voltage divider that it is transformed into the 10-500V signal.Among Fig. 2 and 3, the radioshielding cable adopts double shield structure, two single shielded cables are contained in the big cable inside of one deck shielding, the signal wire two ends connect sensor and preposition module respectively, the internal layer shielding links to each other with the ground of preposition module, outer shielding links to each other with the ground of sensor, improves the antijamming capability of travelling wave signal transmission.
An electric network fault is located example as shown in Figure 4, the core-theaded type traveling wave sensor is socketed on the capacitive equipment ground wire, first-class as capacitance type potential transformer CVT ground wire, condenser type current transformer CT end screen ground wire and bushing shell for transformer end screen ground wire, the partial pressure type traveling wave sensor is connected on the bus-bar potential transformer open-delta winding, and circuit is carried out the high resistance earthing fault experiment.
The experiment test waveform as shown in Figure 5, ch2 is the core-theaded type traveling wave sensor output waveform of socket on the capacitance type potential transformer CVT A phase ground wire among the figure, ch4 is the core-theaded type traveling wave sensor output waveform of socket on the screen ground wire of B phase current mutual inductor CT end, and ch5 is the core-theaded type traveling wave sensor output waveform of socket on the screen ground wire of transformer A phase current mutual inductor CT end.Core-theaded type traveling wave sensor output waveform can reflect that all the fault traveling wave wave head arrives the jump signal of transformer station among the figure, and the waveform that fault phase (A) is measured is greater than non-fault phase (B) waveform; Because the CVT ground capacitance is greater than bushing shell for transformer ground capacitance and condenser type current transformer CT sleeve pipe ground capacitance,, be easy to most measure so the waveform of measuring on capacitance type potential transformer CVT ground wire sudden change is maximum; The waveform of partial pressure type traveling wave sensor output also has bigger amplitude, is convenient to measure, and partial pressure type sensor production and easy for installation, in design error failure row ripple fixer network, should preferentially select to install the partial pressure type traveling wave sensor.
In this electric network fault ground connection experiment, arranged two trouble spots (X point and Y point among Fig. 4) test that experimentizes, measured high resistance earthing fault and low-impedance earthed system fault respectively.Localization of fault result shows: positioning error is all less than 120 meters; The traveling wave sensor measured waveform shows: ground fault resistance is less to the transient state travelling wave effect of signals, and the fault traveling wave location can position all kinds faults such as short circuit, ground connection, broken string, thunders and lightnings.
Because the electrical network jump signal seldom occurs, for whether real-time detection failure positioning system is moved normal, designed a device monitoring loop among Fig. 1, to bus three-phase voltage waveform transformation is square wave, measure three-phase voltage waveform pass zero point absolute time in real time, carry out phase angle by the mistiming of circuit two ends measurement and calculate.This fault locator was tried out 6 months on the 220kV transmission line of electricity, operation result shows: phase voltage waveform zero crossing absolute time measuring error is less than being: 1 μ S, the phase angle measurement error shows that less than 0.018 ° this electric network fault positioning system can realize high-precision phase angle measurement simultaneously.
Claims (9)
1, a kind of power transmission network fault locator based on the row ripple time difference is characterized in that, comprising:
The partial pressure type traveling wave sensor is connected to voltage transformer (VT) open-delta winding, is used to detect the jump signal of voltage transformer (VT) open-delta winding voltage;
The second radioshielding cable couples partial pressure type traveling wave sensor and preposition module, is used for the output signal of partial pressure type traveling wave sensor is delivered to the input end of preposition module;
Preposition module, its input end and the second radioshielding cable couple, and are used to carry out jump signal and detect, and the variation steepness and the size of measuring-signal become the wave head of fault traveling wave signal the pulse signal of certain amplitude, certain width;
The GPS timing module, the output terminal of its input end and preposition module couples, and is used to lock the output pulse signal sudden change absolute time constantly of preposition module;
Communication module couples with GPS timing module, position computer respectively, is used for the row ripple is delivered to position computer time of arrival;
Position computer is used for the signal that the received communication module sends, and finishes localization of fault calculating, demonstration and printing function.
2, the power transmission network fault locator based on the row ripple time difference according to claim 1 is characterized in that: also comprise
The core-theaded type traveling wave sensor is socketed on the electrical network capacitive equipment ground wire, is used for the jump signal of earth current on the detection of grid capacitive equipment ground wire;
The first radioshielding cable couples core-theaded type traveling wave sensor and preposition module, is used for the output signal of core-theaded type traveling wave sensor is delivered to the input end of preposition module.
3, the power transmission network fault locator based on the row ripple time difference according to claim 1, it is characterized in that: described core-theaded type traveling wave sensor is coiling on ring-like magnetic material iron core, coil output connects Transient Voltage Suppressor and voltage divider, coil voltage voltage divider and cablebreak impedance matching, that is: R1//R2=Zc, Zc is the first radioshielding cablebreak impedance, and core-theaded type traveling wave sensor outside is provided with shielding box, and shielding box is for being made the ring box of opening by nonmagnetic substance.
4, the power transmission network fault locator based on the row ripple time difference according to claim 3 is characterized in that: voltage dependent resistor (VDR) in parallel on the voltage divider output resistance of described core-theaded type traveling wave sensor.
5, the power transmission network fault locator based on the row ripple time difference according to claim 3, it is characterized in that: the iron core of described core-theaded type traveling wave sensor is annular high frequency ferrite.
6, the power transmission network fault locator based on the row ripple time difference according to claim 5, it is characterized in that: described core-theaded type traveling wave sensor is an individual layer coiling 5-50 circle coil on annular high frequency ferrite iron core.
7, the power transmission network fault locator based on the row ripple time difference according to claim 2, it is characterized in that: described partial pressure type traveling wave sensor is to constitute voltage divider by two resistance, voltage dependent resistor (VDR) in parallel, Transient Voltage Suppressor at dividing potential drop output resistance two ends.
8, the power transmission network fault locator based on the row ripple time difference according to claim 1 and 2, it is characterized in that: the described first radioshielding cable and the second radioshielding cable all adopt double shield structure, two single shielded cables are contained in the big cable inside of one deck shielding, the signal wire two ends connect sensor and preposition module respectively, the internal layer shielding links to each other with the ground of preposition module, and outer shielding links to each other with the ground of sensor;
9, fault locator according to claim 1, it is characterized in that: also comprise the waveform transformation module, couple with busbar voltage voltage transformer (VT), preposition module respectively, be used for the three-phase voltage signal of voltage transformer (VT) output is transformed to the input end that square-wave signal outputs to preposition module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200320124005 CN2682427Y (en) | 2003-12-18 | 2003-12-18 | Transmission network fault location device based on travelling wave time deviation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200320124005 CN2682427Y (en) | 2003-12-18 | 2003-12-18 | Transmission network fault location device based on travelling wave time deviation |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100487469C (en) * | 2003-12-18 | 2009-05-13 | 湖南湘能电气自动化有限公司 | Travelling time difference based power distribution network fault positioning method and apparatus |
| CN102043116A (en) * | 2011-01-19 | 2011-05-04 | 华北电力大学（保定） | Method for positioning failure point of power grid |
| CN102099698A (en) * | 2008-07-18 | 2011-06-15 | Abb技术有限公司 | Method and device for fault location of series-compensated transmission line |
| CN102183709A (en) * | 2011-03-03 | 2011-09-14 | 华北电力大学（保定） | Method of determining fault point of power grid and severity of fault |
| CN102654550A (en) * | 2011-07-18 | 2012-09-05 | 张滕飞 | Method for testing cable faults by using dielectric loss change |
| CN104345250A (en) * | 2014-11-18 | 2015-02-11 | 东北大学 | Grid fault positioning system and positioning method thereof |
| CN104620119A (en) * | 2012-06-28 | 2015-05-13 | 雷比诺电力系统 | Device and method for monitoring an electrical network |
| CN105474022A (en) * | 2013-09-16 | 2016-04-06 | 施瓦哲工程实验有限公司 | Fault location using traveling waves by calculating traveling wave arrival time |
| JP2019184270A (en) * | 2018-04-03 | 2019-10-24 | 日置電機株式会社 | Current detection device and current measurement device |
| CN110579689A (en) * | 2019-10-14 | 2019-12-17 | 清华四川能源互联网研究院 | Device and method for accurately positioning fault of high-voltage GIL equipment |
| US11187727B2 (en) | 2019-04-29 | 2021-11-30 | Schweitzer Engineering Laboratories, Inc. | Capacitance-coupled voltage transformer monitoring |
| CN114646842A (en) * | 2022-03-03 | 2022-06-21 | 昆明理工大学 | Thunder and lightning overvoltage positioning system based on power transformer |
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2003
- 2003-12-18 CN CN 200320124005 patent/CN2682427Y/en not_active Expired - Lifetime
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100487469C (en) * | 2003-12-18 | 2009-05-13 | 湖南湘能电气自动化有限公司 | Travelling time difference based power distribution network fault positioning method and apparatus |
| CN102099698B (en) * | 2008-07-18 | 2015-06-10 | Abb技术有限公司 | Method and device for fault location of series-compensated transmission line |
| CN102099698A (en) * | 2008-07-18 | 2011-06-15 | Abb技术有限公司 | Method and device for fault location of series-compensated transmission line |
| CN102043116A (en) * | 2011-01-19 | 2011-05-04 | 华北电力大学（保定） | Method for positioning failure point of power grid |
| CN102183709A (en) * | 2011-03-03 | 2011-09-14 | 华北电力大学（保定） | Method of determining fault point of power grid and severity of fault |
| CN102183709B (en) * | 2011-03-03 | 2013-03-27 | 华北电力大学（保定） | Method of determining fault point of power grid and severity of fault |
| CN102654550A (en) * | 2011-07-18 | 2012-09-05 | 张滕飞 | Method for testing cable faults by using dielectric loss change |
| CN104620119A (en) * | 2012-06-28 | 2015-05-13 | 雷比诺电力系统 | Device and method for monitoring an electrical network |
| CN104620119B (en) * | 2012-06-28 | 2018-02-09 | 雷比诺电力系统 | The apparatus and method for monitoring power network |
| CN105474022A (en) * | 2013-09-16 | 2016-04-06 | 施瓦哲工程实验有限公司 | Fault location using traveling waves by calculating traveling wave arrival time |
| CN105474022B (en) * | 2013-09-16 | 2018-05-25 | 施瓦哲工程实验有限公司 | By calculating traveling wave arrival time fault location is carried out using traveling wave |
| CN104345250A (en) * | 2014-11-18 | 2015-02-11 | 东北大学 | Grid fault positioning system and positioning method thereof |
| JP2019184270A (en) * | 2018-04-03 | 2019-10-24 | 日置電機株式会社 | Current detection device and current measurement device |
| JP2023024575A (en) * | 2018-04-03 | 2023-02-16 | 日置電機株式会社 | Current detection device and current measurement device |
| US11187727B2 (en) | 2019-04-29 | 2021-11-30 | Schweitzer Engineering Laboratories, Inc. | Capacitance-coupled voltage transformer monitoring |
| CN110579689A (en) * | 2019-10-14 | 2019-12-17 | 清华四川能源互联网研究院 | Device and method for accurately positioning fault of high-voltage GIL equipment |
| CN114646842A (en) * | 2022-03-03 | 2022-06-21 | 昆明理工大学 | Thunder and lightning overvoltage positioning system based on power transformer |
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Effective date of abandoning: 20090513 |
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