CN105572545A - Power line fault location device and method - Google Patents
Power line fault location device and method Download PDFInfo
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- CN105572545A CN105572545A CN201410591676.2A CN201410591676A CN105572545A CN 105572545 A CN105572545 A CN 105572545A CN 201410591676 A CN201410591676 A CN 201410591676A CN 105572545 A CN105572545 A CN 105572545A
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Abstract
The invention discloses a power line fault location device and method. The method of the invention includes the following steps that: alternating-current high voltage is adopted to perform breakdown on a cable fault point; time difference of the arrival of fault traveling wave signals at line terminals is measured; and a distance from the fault point to the line terminal is calculated . The system is composed of an alternating-current high voltage generator, a traveling wave range finder and a corresponding measurement and control part. According to the power line fault location device and method of the invention, a variety of kinds of alternating-current high voltage generators can be adopted, such as a power-frequency alternating-current test device, a power-frequency resonance test device, a variable frequency resonance test device and an ultra-low frequency alternating-current test device; requirements of current test procedures can be satisfied; a cumulative effect on insulation caused by fault point direct current pulses or oscillation breakdown can be avoided; alternating-current high voltage is adopted to realize fault point breakdown for power lines such as a cable, and therefore, breakdown strength is high, and a breakdown effect is better; automatic ranging of a fault which occurs in a power line alternating current withstand voltage test can be realized, and alternating current withstand voltage testing and fault location can be completed simultaneously.
Description
Technical field
The present invention relates to a kind of feeder line fault distance measuring equipment and distance-finding method, belong to power equipment experimental technique field.
Background technology
Power circuit is the passage of electric energy transmitting, is the chief component of electrical network, usually adopts high-tension overhead line, and part land used is nervous or to line thunder protection, region that requirement of explosion proof is high, more adopts power cable.Generator and transformer extension line often adopt enclosed busbar and tube type bus, also have part to adopt pole line or power cable.
In electric system, the number of faults of power circuit accounts for greatly more than 80% of total failare number, and overhead transmission line is in field, and subject to the meteorological effects such as thunderbolt, strong wind, transient fault occupies the majority, and time-consuming taking a lot of work is searched in trouble spot, many times can only be impacted solving by trial line charging.Usually; air line distance protection all can calculate trouble spot distance; overhead transmission line On-line Fault travelling wave ranging technology obtains a lot of application in recent years; be all comprise trouble spot and line terminal based on traveling wave and wave impedance change point, the catadioptric principle of T joint realizes; part needs the support of GPS high precision clock; fault localization precision is improved, and has software engineering researchers invent traveling-wave protection.Overhead transmission line does not generally adopt withstand voltage method test, and circuit two ends are provided with communication and voltage transformer (VT), the online ranging scheme of general employing.
It is generally acknowledged after power cable line breaks down and can change into permanent fault, pulsed discharge is adopted to carry out the method for cable fault localization, comprise Low Voltage Impulse Method, high voltage pulse method and secondary pulse process the same with aforementioned overhead transmission line with both-end method, all carry out based on traveling wave, catadioptric principle.
Method of Cable Trouble Point is generally divided into low-resistance, middle resistance and high resistant, and middle high resistive fault needs to puncture trouble spot with pulse voltage or electric current, to ensure that trouble spot impedance reduces, thus produces electric discharge and the reflection of row setback.High pressure pulse discharge generally adopts high voltage direct current to charge to capacitor, is discharged to test product by discharging gap or power generation switch.There is Railway Project in this method: 1, DC pulse has cumulative effect to the non-breakage solid insulation of cable, affects cable life, and existing testing regulations clear stipulaties does not carry out DC testing of cables; 2, DC pulse destructive power is poor, even may raise by causing trouble point resistance, does not puncture time serious; 3, discharging gap or switch need breaking direct current, and failure rate is high.
Cable wave of oscillation tester uses high-voltage capacitance to store high direct voltage electric energy, and DC energy storage is by telefault to cable discharge, and telefault and cable over the ground distributed capacitance generation low-frequency resonant produce low-frequency oscillation ripple, realize the test of cable.When cable built-in electrical insulation destroys generation electric discharge, discharge pulse transmits in cable, can adopt travelling wave ranging method equally, realizes trouble spot range finding.The problem solving DC pulse electric discharge of this environment division, discharge switch does not need breaking direct current, and cost is low, long service life; The AC compounent produced punctures effective to trouble spot, built-in travelling wave ranging accuracy is high, therefore obtains good effect, and energize portions department applies.But the wave of oscillation high pressure that this equipment produces is superimposed with very high DC component, there is the direct current cumulative effect of cable insulation equally, does not meet existing testing regulations requirement; The withstand voltage of alternating current-direct current superposition simultaneously and the equivalence of ac voltage withstanding voltage do not have ripe checking.
Summary of the invention
For the deficiencies in the prior art, primary technical matters to be solved by this invention is to provide a kind of feeder line fault more effective trouble spot of finding range to puncture method, namely the way of pure ac high-voltage is adopted, comprise the low-frequency ac high pressure techniques such as industrial frequency AC high pressure, power frequency series resonance high pressure, variable-frequency series-resonance high pressure, ultra-low frequency high-pressure, possess skills maturation, equipment reliably, the advantage that test effect is good.
Another technical matters to be solved by this invention is by ac voltage withstanding and the synthesis of fault localization equipment, to realize the automatic range broken down in circuit withstand voltage test process.
For achieving the above object, the present invention adopts following technical scheme:
On the one hand, the invention provides a kind of feeder line fault distance-finding method, comprising:
Adopt ac high-voltage to treat test article to carry out trouble spot and puncture;
Test product to be measured is made to produce high-frequency impulse travelling wave signal;
Gather high-frequency impulse travelling wave signal;
Utilize travelling wave ranging method according to high-frequency impulse travelling wave signal, carry out fault localization.
Wherein more preferably, described ac high-voltage is the one in industrial frequency AC high pressure, power frequency series resonance high pressure, variable-frequency series-resonance high pressure, ultralow frequency ac high-voltage.
Wherein more preferably, to be example be described industrial frequency AC high pressure by industrial frequency AC high pressure is that example device produces, and described industrial frequency AC high pressure is that example device comprises:
Pressure regulator, boosting change, protector, voltage divider, controller, travelling wave ranging instrument, coupling mechanism;
The input end of described pressure regulator is connected to power frequency supply, and this output voltage is input to described boosting change; Secondary side winding one end ground connection that described boosting becomes, the other end is linked into test product through described protector, the protective seam ground connection of test product; The output terminal of described protector is connected with described voltage divider; The output termination coupler input of described voltage divider, coupling mechanism earth terminal ground connection; Described controller is connected with described pressure regulator, described voltage divider; Described travelling wave ranging instrument connects the output terminal of described coupling mechanism; The voltage division signal of described controller collection voltage divider carries out to described pressure regulator the adjustment testing high pressure;
Described pressure regulator produces high pressure to power frequency supply pressure regulation; described excitation exports protector to after becoming the high voltage step-up process exported described pressure regulator; and be added on test product by protector; make by regulating the high pressure of pressure regulator; thus ac high-voltage is produced on test product; the high-frequency impulse traveling wave signal transmission that described test product produces is to described coupling mechanism, and described travelling wave ranging instrument gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
Wherein more preferably, described power frequency series resonance high pressure is produced by power frequency series resonance high-tension unit, and described power frequency series resonance high-tension unit comprises:
The change of pressure regulator, excitation, controllable impedance, voltage divider, controller, travelling wave ranging instrument, coupling mechanism;
The input end of described pressure regulator is connected to AC power, after carrying out pressure regulation, output voltage is input to described excitation and becomes; Secondary side winding one end ground connection that described excitation becomes, the other end is linked into test product to be measured through described controllable impedance, and by the grounded part ground connection of described test product to be measured; The output terminal of described controllable impedance is also connected with described voltage divider; The output termination coupler input of described voltage divider, coupling mechanism earth terminal ground connection; Described controller is connected with described controllable impedance, described voltage divider; Described travelling wave ranging instrument connects the output terminal of described coupling mechanism; Described controller gathers the voltage division signal of voltage divider to the described controllable impedance of control;
Described pressure regulator produces high pressure to power frequency supply pressure regulation, described excitation exports controllable impedance to after becoming the high voltage step-up process exported described pressure regulator, and by and controllable impedance is added on test product, loop is made to form resonance by regulating the induction reactance of controllable impedance, thus on test product, produce resonance high voltage, the high-frequency impulse traveling wave signal transmission that described test product produces is to described coupling mechanism, and described travelling wave ranging instrument gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
Wherein more preferably, the inductance value of described controllable impedance meets:
Wherein, L is inductance value, and C is test product electric capacity.
Wherein more preferably, described variable-frequency series-resonance high pressure is produced by variable-frequency series-resonance high-tension unit, and described variable-frequency series-resonance high-tension unit comprises:
The change of frequency converter, excitation, inductance, voltage divider, controller, travelling wave ranging instrument, coupling mechanism;
The input end of described frequency converter connects power frequency supply and exports termination excitation change input end, secondary side winding one end ground connection that excitation becomes, and the other end is linked into test product through described inductance; The protective seam ground connection of described test product; The output terminal of described inductance is also connected with described voltage divider; The output termination coupler input of described voltage divider, coupling mechanism earth terminal ground connection; Described controller is connected with described frequency converter, described voltage divider; Described travelling wave ranging instrument connects the output terminal of described coupling mechanism; The voltage division signal of described controller collection voltage divider controls reverse frequency and the voltage of described frequency converter, thus controls the voltage on described test product.
Described frequency converter becomes exporting described excitation after AC power frequency conversion to, and described excitation becomes the alternating voltage boosting process after described frequency converter frequency-conversion processing, and exports inductance to, is added on test product by inductance; Power frequency supply is made to be converted into the variable-frequency power sources of certain frequency by regulating frequency converter, thus on test product, produce series resonance high voltage, the high-frequency impulse traveling wave signal transmission that described test product fault discharge produces is to described coupling mechanism, and described travelling wave ranging instrument gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
Wherein more preferably, described frequency converter frequency meets:
Wherein, f
0represent frequency converter frequency, L is inductance value, and C is test product electric capacity.
Wherein more preferably, it is characterized in that, described voltage divider is the good capacitive divider of frequency characteristic and RC divider, and described coupling mechanism is row wave voltage coupling mechanism;
Described voltage divider output terminal connected row wave voltage coupler input, the output terminal of described row wave voltage coupling mechanism is connected with the secondary side winding that described excitation becomes and ground connection;
Described travelling wave ranging instrument gathers by described row wave voltage coupling mechanism the range finding that travelling wave signal carries out trouble spot;
The secondary side winding connected row ripple current transducer input end that described voltage divider output terminal and described excitation become, the output head grounding of described travelling wave current coupling mechanism;
Described travelling wave ranging instrument gathers by described travelling wave current coupling mechanism the range finding that travelling wave signal carries out trouble spot.
Wherein more preferably, the ranging step that described travelling wave ranging instrument carries out trouble spot by described coupling mechanism collection travelling wave signal comprises further:
Measure discharge pulse travelling wave signal and reach discharge pulse initial row ripple time of arrival of test lead, trouble spot reflected traveling wave time of arrival and opposite end reflected traveling wave time of arrival;
The dielectric coefficient of known test product insulating material and magnetic capacity, calculate the velocity of electromagnetic wave in test product;
According to transmission speed electromagnetic in test product, then the distance of discharge fault point distance test (DT) end;
According to transmission speed electromagnetic in test product, calculate test product total length.
Wherein more preferably, it is characterized in that,
Described high-frequency impulse travelling wave signal comprises discharge pulse initial row ripple, trouble spot reflected traveling wave and opposite end reflected traveling wave.
The invention provides a kind of feeder line fault distance measuring equipment on the other hand, apply above-mentioned fault distance-finding method, comprising: pressure regulator, boosting change, protector, voltage divider, controller, travelling wave ranging instrument, coupling mechanism;
The input end of described pressure regulator is connected to power frequency supply, and this output voltage is input to described boosting change; Secondary side winding one end ground connection that described boosting becomes, the other end is linked into test product through described protector, the protective seam ground connection of test product; The output terminal of described protector is connected with described voltage divider; The output termination coupler input of described voltage divider, coupling mechanism earth terminal ground connection; Described controller is connected with described pressure regulator, described voltage divider; Described travelling wave ranging instrument connects the output terminal of described coupling mechanism; The voltage division signal of described controller collection voltage divider carries out to described pressure regulator the adjustment testing high pressure;
Described pressure regulator produces high pressure to power frequency supply pressure regulation; described excitation exports protector to after becoming the high voltage step-up process exported described pressure regulator; and be added on test product by protector; make by regulating the high pressure of pressure regulator; thus ac high-voltage is produced on test product; the high-frequency impulse traveling wave signal transmission that described test product produces is to described coupling mechanism, and described travelling wave ranging instrument gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
Compared with prior art, feeder line fault distance measuring equipment provided by the invention and distance-finding method, adopt the way of pure ac high-voltage, eliminates the cumulative damage effect of the method such as DC pulse, the wave of oscillation to insulation; Adopt the way of pure ac high-voltage, the reliable advantage of the maturation that possesses skills, equipment; Adopt the way of pure ac high-voltage, have trouble spot breakdown capability large, centering high resistant test effect is good, advantage fast of finding range; By ac voltage withstanding and the synthesis of fault localization equipment, realize the automatic range broken down in circuit withstand voltage test process; Realize the integrated of ac voltage withstanding and fault localization testing equipment.
Accompanying drawing explanation
Fig. 1 the present invention is based on feeder line fault distance-finding method schematic flow sheet;
Fig. 2 is in one embodiment of the invention, a kind of one-piece construction of power circuit power frequency high voltage fault distance measuring equipment and wiring diagram;
Fig. 3 is the travelling wave ranging principle schematic of a kind of feeder line fault distance-finding method of the present invention;
Fig. 4 is the row wave reflection point schematic diagram of a kind of feeder line fault distance-finding method shown in Fig. 3;
Fig. 5 is in another embodiment of the present invention, a kind of one-piece construction of power circuit power frequency high voltage fault range measurement system and wiring diagram;
Fig. 6 is in another embodiment of the present invention, a kind of principle schematic of power circuit power frequency series resonance test;
Fig. 7 be Fig. 6 the voltage vector schematic diagram of embodiment is provided;
Fig. 8 is in another embodiment of the present invention, based on one-piece construction and the wiring diagram of the withstand voltage distance measuring equipment of variable-frequency series-resonance;
Fig. 9 is in another embodiment of the present invention, based on the withstand voltage distance measuring equipment fundamental diagram of variable-frequency series-resonance.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
As shown in Figure 1, the invention provides a kind of power circuit fault distance measurement, comprising: adopt ac high-voltage to treat test article and carry out trouble spot and puncture; Test product to be measured is made to produce high-frequency impulse travelling wave signal; Gather high-frequency impulse travelling wave signal; Utilize travelling wave ranging method according to high-frequency impulse travelling wave signal, carry out fault localization.Detailed description is launched to feeder line fault distance-finding method provided by the invention below.
When feeder line fault distance-finding method provided by the invention being found range to feeder line fault, different ac high-voltages can be added according to actual conditions to test product below.Such as industrial frequency AC high pressure, power frequency series resonance high pressure, variable-frequency series-resonance high pressure, ultralow frequency ac high-voltage.Below in conjunction with different embodiments, detailed description is launched to feeder line fault distance-finding method provided by the invention.
Embodiment 1
If select to add power frequency ac voltage to test product, then need to add ac high-voltage by industrial frequency AC high-tension unit to test product.Fig. 2 shows structure and the test connection figure of feeder line fault distance-finding method.With reference to Fig. 2, system of the present invention comprises AC power 1, pressure regulator 2, boosting change 3, protector 4, voltage divider 5, controller 6, travelling wave ranging instrument 7, voltage coupler 9 or current transducer 10.Wherein, the input end of pressure regulator 2 is connected to AC power 1, after pressure regulation, gets a part for input voltage as output voltage, and this output voltage is input to boosting change 3.The voltage of institute's input voltage boosts by boosting change 3, secondary side winding one end ground connection of boosting change 3, and the other end is linked into test product 0 through protector 4, and by the protective seam grounding of test product 0.Voltage divider 5 is also connected with at the output terminal of protector 4.Voltage divider 5 adopts multiple capacitances in series, thus forms capacitive divider.The voltage division signal that controller 6 gathers voltage divider 5 controls pressure regulator 2.Travelling wave ranging instrument gathers by voltage coupler 9 or current transducer 10 range finding that travelling wave signal carries out trouble spot.
The principle of work of system provided by the present invention is as follows: when the system is operating, and power frequency supply is carried out pressure regulation process and output voltage through pressure regulator 2, and this output voltage carries out being provided to test product 0 through overprotection device 4 after boosting process through boosting change 3.Now can there is voltage in voltage divider 5, and voltage division signal is supplied to controller 6.Controller 6 makes the voltage be loaded into above test product 0 raise gradually by controlling pressure regulator 2.When test product 0 insulate existing defects, and when ac high-voltage reaches certain value, there are electric discharge phenomena in defective part branch, i.e. trouble spot electric discharge.Now, discharge pulse can be propagated in test product, forms high frequency traveling wave signal.In one embodiment of the invention, row wave voltage is different with the catadioptric behavior of current signal, when voltage divider 5 is capacitive divider and electric capacity is larger, electric discharge high-frequency voltage signal can well pass through, voltage coupler 9 should be established, extract the capable wave voltage signal of high frequency, and by capable for this high frequency wave voltage Signal transmissions to travelling wave ranging instrument; Otherwise, current transducer 10 should be adopted to extract electric discharge high-frequency current signal.
As shown in Figure 3 and Figure 4, when test product 0 discharges, the capable wave voltage of the high frequency produced (or electric current) signal reaches the primary wave burst length t1 of test lead, arrive the time t2 of trouble spot reflected wave pulses, as transmission speed v electromagnetic in known test product, the distance of discharge fault point distance test (DT) end can be calculated
if the capable ripple of discharge pulse the arrives test lead ground time after arriving opposite end reflection is t3, then test product total length computing formula is
wave velocity can be calculated according to known length, or calculate test product physical length according to wave velocity.
Embodiment 2,
If select to add power frequency ac voltage to test product, then need to add ac high-voltage by industrial frequency AC high-tension unit to test product.Because AC power is boosted to alternating voltage by needs, then can cause larger power attenuation, therefore, the present invention improves embodiment 1, adopt power frequency series resonance technology, for simplicity, below be only described in detail for the difference of two embodiments.
As shown in Figure 5, a kind of this device of industrial frequency AC high-tension unit is provided to comprise in the present embodiment: pressure regulator 2, excitation change 3, controllable impedance 11, voltage divider 5, controller 6, travelling wave ranging instrument 7, coupling mechanism; The input end of pressure regulator 2 is connected to AC power 1, after carrying out pressure regulation, output voltage is input to excitation and becomes 3; Excitation becomes secondary side winding one end ground connection of 3, and the other end is linked into test product 0 to be measured through controllable impedance 4, and by the grounded part ground connection of test product 0 to be measured; The output terminal of controllable impedance 11 is also connected with voltage divider 5; The output termination coupler input of voltage divider 5, coupling mechanism earth terminal ground connection; Described controller 6 is connected with described controllable impedance 11, described voltage divider 5; Described travelling wave ranging instrument 7 connects the output terminal of described coupling mechanism; The voltage division signal that described controller 6 gathers voltage divider 5 controls described controllable impedance 11; 2 pairs of power frequency supply 1 pressure regulation of described pressure regulator produce high pressure, and described excitation exports controllable impedance 11 to after becoming the 3 high voltage step-up process exported described pressure regulator 2, and pass through and controllable impedance 11 is added on test product; Loop is made to form resonance by regulating the induction reactance of controllable impedance 11, thus resonance high voltage is produced on test product 0, the electric discharge high-frequency impulse travelling wave signal that described test product 0 produces and turn back and penetrate traveling wave signal transmission to described coupling mechanism, described travelling wave ranging instrument 7 gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
The present embodiment provide the principle of work of pilot system as follows: described pressure regulator 2, by AC power frequency supply 1 pressure regulation, is boosted by described boosting change 3, and described controller 6, by measuring the secondary voltage of described voltage divider 5, controls described controllable impedance 11.As shown in Fig. 6 Fig. 7, when controllable impedance 11 meets
time, inductive reactance is equal with the reactance of test product 0 distributed capacitance to cancel each other, namely
as shown in Figure 6, the distributed capacitance of described controllable impedance 11 and test product 0 produces series resonance, thus produces high voltage on test product 0, can carry out power frequency series resonance AC voltage withstand test to sample with large capacitance such as power cables.If test product 0 punctures, then its distributed capacitance is by short circuit, and the reactance 2 π fL of AC power 1 equivalent internal resistance R and controllable impedance 11 well can limit test product electric current.Because power during test is only limitted to the power consumption of power supply equivalent internal resistance R, therefore, the power input of the present embodiment is much less than test power.
Embodiment 3,
If select to add variable-frequency series-resonance high pressure to test product, then need to add ac high-voltage by variable-frequency series-resonance high-tension unit to test product.Because AC power is boosted to alternating voltage by needs, then can cause larger power attenuation, therefore, the present invention improves embodiment 1, adopt variable-frequency series-resonance technology, for simplicity, below be only described in detail for the difference of two embodiments.
As shown in Figure 8, provide a kind of variable-frequency series-resonance high-tension unit in the present embodiment, this device comprises: frequency converter 2, excitation change 3, inductance 4, voltage divider 6, controller 7, travelling wave ranging instrument 7, coupling mechanism; The input end of described frequency converter 2 connects power frequency supply 1, and export termination excitation and become 3 input ends, excitation becomes secondary side winding one end ground connection of 3, and the other end is linked into test product 0 through described inductance 4; The protective seam ground connection of described test product 0; The output terminal of described inductance 4 is also connected with described voltage divider 5; The output termination coupler input of described voltage divider 5, coupling mechanism earth terminal ground connection; Described controller 6 is connected 6 with described frequency converter 2, described voltage divider; Described travelling wave ranging instrument 8 connects the output terminal of described coupling mechanism; Described controller 6 gathers the voltage division signal of voltage divider 5 to the described frequency converter 2 of control; Export described excitation after the frequency conversion of described frequency converter 2 pairs of AC power 1 to and become 3, described excitation becomes 3 to the alternating voltage boosting process after described frequency converter 2 frequency-conversion processing, and exports inductance 4 to, is added on test product 0 by inductance 4; Power frequency supply 1 is made to be converted into the variable-frequency power sources of certain frequency by regulating frequency converter 2, thus series resonance high voltage is produced on test product 0, the electric discharge high-frequency impulse travelling wave signal that described test product 0 produces and turn back and penetrate traveling wave signal transmission to described coupling mechanism, described travelling wave ranging instrument 7 gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
The present embodiment provide the principle of work of withstand voltage distance measuring equipment as follows: AC power frequency supply 1 is converted to 30 ~ 300Hz (impedance of described coupling mechanism to 30-300Hz low-frequency current is almost equal to zero) by described frequency converter 2, become 3 by excitation to boost, the alternating voltage after boosting is loaded on test product 0 through inductance 4.Its output voltage now measured by the voltage divider 5 be connected with inductance 4 output terminal.Described controller 6, by measuring the secondary voltage of described voltage divider 5, controls described frequency converter 2.As shown in Figure 9, when a certain frequency meets
time, inductance 4 induction reactance is equal with test product 0 distributed capacitance C0 capacitive reactance to cancel each other, namely
the distributed capacitance of inductance 4 and test product 0 produces series resonance, thus produces resonance high voltage on test product 0, can carry out variable-frequency series-resonance AC voltage withstand test to test product 0.When test product 0 insulate existing defects and resonance high voltage reach certain value time, there are electric discharge phenomena in defective part branch, i.e. trouble spot electric discharge.When discharging in test product 0 trouble spot, its distributed capacitance is by short circuit, and now, discharge pulse can be propagated in test product, forms high frequency traveling wave signal.
Feeder line fault distance measuring equipment provided by the invention and distance-finding method, not only can search by feeder line fault, can also be used for gas insulation electric appliance GIS, the internal discharge of transformer searches, but should assist other supplementary meanss.
Known by above-described embodiment, use the fault distance-finding method of feeder line fault distance measuring equipment provided by the present invention and distance-finding method to have following beneficial effect:
1, the present invention's ac high voltage source instead of the high-voltage dc pulse power of fault localization, does not have the charge accumulation effects that high direct voltage is harmful to insulation.
2, the present invention's ac high voltage source instead of the high-voltage dc pulse power of fault localization, and it is effective, good to breakdown current restriction effect to puncture trouble spot, does not use discharge switch or gap, simple and reliable.
3, the present invention can be used for the ac voltage withstanding of power cable and bus, GIS device, and can carry out fault localization simultaneously.
4, the present invention can be combined into multiple ac voltage withstanding and fault localization test unit.
This method also can be used for the fault localization of overhead transmission line, tube type bus, enclosed busbar, and method is identical with embodiment.
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (11)
1. a feeder line fault distance-finding method, is characterized in that, comprising:
Adopt ac high-voltage to treat test article to carry out trouble spot and puncture;
Test product to be measured is made to produce high-frequency impulse travelling wave signal;
Gather high-frequency impulse travelling wave signal;
Utilize travelling wave ranging method according to high-frequency impulse travelling wave signal, carry out fault localization.
2. feeder line fault distance-finding method as claimed in claim 1, it is characterized in that, described ac high-voltage is the one in industrial frequency AC high pressure, power frequency series resonance high pressure, variable-frequency series-resonance high pressure, ultralow frequency ac high-voltage.
3. feeder line fault distance-finding method as claimed in claim 2, is characterized in that, to be example be described industrial frequency AC high pressure by industrial frequency AC high pressure is that example device produces, and described industrial frequency AC high pressure is that example device comprises:
Pressure regulator, boosting change, protector, voltage divider, controller, travelling wave ranging instrument, coupling mechanism;
The input end of described pressure regulator is connected to power frequency supply, and this output voltage is input to described boosting change; Secondary side winding one end ground connection that described boosting becomes, the other end is linked into test product through described protector, the protective seam ground connection of test product; The output terminal of described protector is connected with described voltage divider; The output termination coupler input of described voltage divider, coupling mechanism earth terminal ground connection; Described controller is connected with described pressure regulator, described voltage divider; Described travelling wave ranging instrument connects the output terminal of described coupling mechanism; The voltage division signal of described controller collection voltage divider carries out to described pressure regulator the adjustment testing high pressure;
Described pressure regulator produces high pressure to power frequency supply pressure regulation; described excitation exports protector to after becoming the high voltage step-up process exported described pressure regulator; and be added on test product by protector; make by regulating the high pressure of pressure regulator; thus ac high-voltage is produced on test product; the high-frequency impulse traveling wave signal transmission that described test product produces is to described coupling mechanism, and described travelling wave ranging instrument gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
4. feeder line fault distance-finding method as claimed in claim 2, it is characterized in that, described power frequency series resonance high pressure is produced by power frequency series resonance high-tension unit, and described power frequency series resonance high-tension unit comprises:
The change of pressure regulator, excitation, controllable impedance, voltage divider, controller, travelling wave ranging instrument, coupling mechanism;
The input end of described pressure regulator is connected to AC power, after carrying out pressure regulation, output voltage is input to described excitation and becomes; Secondary side winding one end ground connection that described excitation becomes, the other end is linked into test product to be measured through described controllable impedance, and by the grounded part ground connection of described test product to be measured; The output terminal of described controllable impedance is also connected with described voltage divider; The output termination coupler input of described voltage divider, coupling mechanism earth terminal ground connection; Described controller is connected with described controllable impedance, described voltage divider; Described travelling wave ranging instrument connects the output terminal of described coupling mechanism; Described controller gathers the voltage division signal of voltage divider to the described controllable impedance of control;
Described pressure regulator produces high pressure to power frequency supply pressure regulation, described excitation exports controllable impedance to after becoming the high voltage step-up process exported described pressure regulator, and by and controllable impedance is added on test product, loop is made to form resonance by regulating the induction reactance of controllable impedance, thus on test product, produce resonance high voltage, the high-frequency impulse traveling wave signal transmission that described test product produces is to described coupling mechanism, and described travelling wave ranging instrument gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
5. feeder line fault distance-finding method as claimed in claim 4, is characterized in that, the inductance value of described controllable impedance meets:
Wherein, L is inductance value, and C is test product electric capacity.
6. feeder line fault distance-finding method as claimed in claim 2, it is characterized in that, described variable-frequency series-resonance high pressure is produced by variable-frequency series-resonance high-tension unit, and described variable-frequency series-resonance high-tension unit comprises:
The change of frequency converter, excitation, inductance, voltage divider, controller, travelling wave ranging instrument, coupling mechanism;
The input end of described frequency converter connects power frequency supply and exports termination excitation change input end, secondary side winding one end ground connection that excitation becomes, and the other end is linked into test product through described inductance; The protective seam ground connection of described test product; The output terminal of described inductance is also connected with described voltage divider; The output termination coupler input of described voltage divider, coupling mechanism earth terminal ground connection; Described controller is connected with described frequency converter, described voltage divider; Described travelling wave ranging instrument connects the output terminal of described coupling mechanism; The voltage division signal of described controller collection voltage divider controls reverse frequency and the voltage of described frequency converter, thus controls the voltage on described test product.
Described frequency converter becomes exporting described excitation after AC power frequency conversion to, and described excitation becomes the alternating voltage boosting process after described frequency converter frequency-conversion processing, and exports inductance to, is added on test product by inductance; Power frequency supply is made to be converted into the variable-frequency power sources of certain frequency by regulating frequency converter, thus on test product, produce series resonance high voltage, the high-frequency impulse traveling wave signal transmission that described test product fault discharge produces is to described coupling mechanism, and described travelling wave ranging instrument gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
7. feeder line fault distance-finding method as claimed in claim 6, is characterized in that, described frequency converter frequency meets:
Wherein, f0 represents frequency converter frequency, and L is inductance value, and C is test product electric capacity.
8. the feeder line fault distance-finding method as described in claim 3-7 any one, is characterized in that, described voltage divider is the good capacitive divider of frequency characteristic or RC divider, and described coupling mechanism is row wave voltage coupling mechanism;
Described voltage divider output terminal connected row wave voltage coupler input, the output terminal of described row wave voltage coupling mechanism is connected with the secondary side winding that described excitation becomes and ground connection;
Described travelling wave ranging instrument gathers by described row wave voltage coupling mechanism the range finding that travelling wave signal carries out trouble spot;
The secondary side winding connected row ripple current transducer input end that described voltage divider output terminal and described excitation become, the output head grounding of described travelling wave current coupling mechanism;
Described travelling wave ranging instrument gathers by described travelling wave current coupling mechanism the range finding that travelling wave signal carries out trouble spot.
9. feeder line fault distance-finding method as claimed in claim 8, is characterized in that, the step that described travelling wave ranging instrument carries out the range finding of trouble spot by described coupling mechanism collection travelling wave signal comprises further:
Measure discharge pulse travelling wave signal and reach discharge pulse initial row ripple time of arrival of test lead, trouble spot reflected traveling wave time of arrival and opposite end reflected traveling wave time of arrival;
The dielectric coefficient of known test product insulating material and magnetic capacity, calculate the velocity of electromagnetic wave in test product;
According to transmission speed electromagnetic in test product, then the distance of discharge fault point distance test (DT) end;
According to transmission speed electromagnetic in test product, calculate test product total length.
10. feeder line fault distance-finding method as claimed in claim 1, is characterized in that,
Described high-frequency impulse travelling wave signal comprises discharge pulse initial row ripple, trouble spot reflected traveling wave and opposite end reflected traveling wave.
Feeder line fault distance measuring equipment described in 11. 1 kinds, applies method according to claim 1, it is characterized in that, comprising: pressure regulator, boosting change, protector, voltage divider, controller, travelling wave ranging instrument, coupling mechanism;
The input end of described pressure regulator is connected to power frequency supply, and this output voltage is input to described boosting change; Secondary side winding one end ground connection that described boosting becomes, the other end is linked into test product through described protector, the protective seam ground connection of test product; The output terminal of described protector is connected with described voltage divider; The output termination coupler input of described voltage divider, coupling mechanism earth terminal ground connection; Described controller is connected with described pressure regulator, described voltage divider; Described travelling wave ranging instrument connects the output terminal of described coupling mechanism; The voltage division signal of described controller collection voltage divider carries out to described pressure regulator the adjustment testing high pressure;
Described pressure regulator produces high pressure to power frequency supply pressure regulation; described excitation exports protector to after becoming the high voltage step-up process exported described pressure regulator; and be added on test product by protector; make by regulating the high pressure of pressure regulator; thus ac high-voltage is produced on test product; the high-frequency impulse traveling wave signal transmission that described test product produces is to described coupling mechanism, and described travelling wave ranging instrument gathers by described coupling mechanism the range finding that travelling wave signal carries out trouble spot.
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