CN201359630Y - DC injection-type line selection and positioning device adopting self-adapting adjustable resistor - Google Patents
DC injection-type line selection and positioning device adopting self-adapting adjustable resistor Download PDFInfo
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- CN201359630Y CN201359630Y CNU2009200227467U CN200920022746U CN201359630Y CN 201359630 Y CN201359630 Y CN 201359630Y CN U2009200227467 U CNU2009200227467 U CN U2009200227467U CN 200920022746 U CN200920022746 U CN 200920022746U CN 201359630 Y CN201359630 Y CN 201359630Y
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Abstract
The utility model discloses a DC injection-type line selection and positioning device adopting self-adapting adjustable resistor. The device has the advantages of simple structure, convenient use, self-adjusting the size of current-limiting resistor along with the fault conditions, and the like. The device comprises a grounding transformer, a DC generator and a control device; the grounding transformer is connected with a system bus, the voltage to ground at the neutral point is adopted as the power supply for the DC generator in case of system failure, and the primary coil of the grounding transformer is adopted to inject DC to a fault system; the DC generator is connected between the neutral point N on the primary side of the grounding transformer and the ground, the control device is connected to the secondary side of a bus voltage transformer, so as to monitor the existence of single-phase ground fault in a power distribution network and control the DC switching, and at the same time, the injected DC is measured; and the DC generator is formed by a self-adapting adjustable resistor R, a fling-cut switch K and a DC measuring transducer MA, and the self-adapting adjustable resistor R and the fling-cut switch K are connected in series through a silicon stack D.
Description
Technical field
The utility model relates to a kind of direct current injection type route selecting locating device that adopts the self-adaptation adjustable resistance.
Background technology
Resistivity is meant the resistance of certain material in unit length, unit cross section, is the physical quantity of reaction material electric conductivity, represents with ρ.ρ shows the material poorly conductive greatly, and ρ shows that for a short time material electric conductivity is strong.
The law of resistance is: when temperature-resistant, the resistance of conductor is directly proportional with its length, follows its cross-sectional area to be inversely proportional to.Law of resistance formula is:
The resistivity of material changes with temperature.The resistivity of some material increases (as metal) with the rising of temperature, and the resistivity of some material reduces (as semiconductor and insulator) with the rising of temperature, and the resistivity of some material is subjected to Temperature Influence (as copper-manganese and constantan) hardly.The resistivity of nearly all metallic conductor approximate concerning: ρ all and between the temperature in general temperature range just like lower linear
t=ρ
0(1+ α t), ρ in the formula
t, ρ
0Be respectively temperature t ℃, the resistivity 0 ℃ the time, α is called the temperature coefficient of resistance, and unit is ℃
-1(every degree).
Filament is the key components of incandescent lamp bulb, is made by tungsten filament.To a finished product incandescent lamp bulb, the length and the cross-sectional area of its filament are certain, according to the law of resistance, then the resistivity of the resistance of filament and filament is linear, the resistivity of nearly all metallic conductor approximate concerning just like lower linear: ρ all and between the temperature in general temperature range
t=ρ
0(1+ α t).Therefore, the resistance of filament increases with the rising of filament temperature.Incandescent lamp is worked under different voltages or electric current, the temperature difference of filament, and the resistance of filament also is different.When bulb was not luminous, filament temperature had only tens degree, and normally can reach more than 2000 ℃ when luminous.Filament resistance increases with the rising of temperature, and is nonlinear relationship significantly, and this is because tungsten has positive resistance characteristic.Resistance when bulb does not power up is called cold-state resistance.The resistance that records when applying rated voltage is called hot resistance.The hot resistance of general incandescent lamp filament is 12-16 a times of cold-state resistance, and the relation of incandescent light electrical quantity and voltage as shown in Figure 1.
The neutral point method of operation of China's power distribution network adopts the isolated neutral mode or through the grounding through arc mode, take place not form short-circuit loop behind the singlephase earth fault, the very little zero-sequence current that has only system's distributed capacitance to cause makes that one-phase earthing failure in electric distribution network circuit and location are the technical barriers that all the time is not solved.DC injection method is a kind of very effective single-phase earth fault line selection positioning principle, when singlephase earth fault takes place, inject semi-wave DC to failure system, realize the route selection and the location of one-phase earthing failure in electric distribution network by the current intelligence of surveying the semi-wave DC that injects from grounding transformer primary side neutral point.For fear of the DC current of injecting distribution system is caused adverse effect, the DC current that needs restriction to inject can not surpass certain value.Therefore, need carry out amplitude limit to the DC current of injecting.
The applicant is that CN201173956, name are called in the patent of direct current injection type route selecting positioning system at the publication number of first to file, its principle is as follows: when power distribution network normally moves, system's symmetry, three phase-to-ground voltages are phase voltage, grounding transformer primary side neutral point voltage-to-ground is zero, K switch disconnects, and dc generator and system disconnect, and the DC current generator is not worked.When singlephase earth fault took place, grounding transformer primary side neutral point voltage-to-ground raise, along with the trouble spot transition resistance varies in size and difference, the highest phase voltage that is elevated to, the K that closes a switch, this voltage is injected into DC current in the failure system for the constant current generator provides power supply.The DC current of injecting forms the loop mutually and between the trouble spot in grounding transformer primary side neutral point, winding of grounding transformer, faulty line fault, as shown in phantom in Figure 1, has only the fault of fault feeder to form path for DC current mutually.Survey the DC current trace in each outgoing exit with along fault feeder, can realize route selection and location.
Know that by Fig. 2 the size that the size need of injection DC current are regulated current-limiting resistance according to the variation of grounding transformer neutral point voltage reaches the purpose that limits the injection current size.Traditional current-limiting resistance is made of a plurality of resistance series connection, and the current-limiting resistance R among Fig. 2 is by resistance R
1-R
6Be composed in series, as shown in Figure 3, the size of current-limiting resistance is passed through K switch
1-K
6Closed or disconnect and regulating.K switch
1-k
6Available A.C. contactor or thyristor are realized, gauge tap K
1-K
6Closed or disconnect and need correspondent control circuits to realize, and switch k
1-K
6Number needs closed or that disconnect calculate in real time according to the singlephase earth fault situation.In addition, occasion shown in Figure 2, R
1-R
6Need select high-power resistance for use, though as seen this method can realize regulating the function of size of current, electric current can not be adjustable continuously, and required controller architecture complexity, and cost is higher.
Summary of the invention
The purpose of this utility model is exactly in order to address the above problem, and provides a kind of and has simple in structurely, easy to use, and current-limiting resistance can be regulated the direct current injection type route selecting locating device of the employing self-adaptation adjustable resistance of advantages such as size automatically with failure condition.
For achieving the above object, the utility model adopts following technical scheme:
A kind of direct current injection type route selecting locating device that adopts the self-adaptation adjustable resistance, it comprises grounding transformer, DC current generator, control device; Wherein grounding transformer is received on the system busbar, gets the power supply of neutral point voltage-to-ground as the DC current generator when the system failure, and injects direct current by the primary winding of grounding transformer to failure system; Connect the DC current generator between the neutral point N of grounding transformer primary side and the earth, control device is received the secondary side of bus-bar potential transformer, whether the monitoring distribution system singlephase earth fault takes place, and the switching of control DC current, measure the size of injecting DC current simultaneously, described DC current generator is made of silicon stack D serial connection self-adaptation adjustable resistance R and fling-cut switch K, direct current measurement sensor MA.
Described self-adaptation adjustable resistance R is in series by at least one current-limiting resistance and at least one incandescent lamp.
Described current-limiting resistance has two, and they are connected in series.
Described silicon stack D rectification produces DC current, and the self-adaptation adjustable resistance R that goes here and there is a current-limiting resistance, the input and the excision of fling-cut switch K control DC current; Direct current measurement sensor MA is used for measuring the size of injecting direct current.
The utility model utilizes the resistance characteristic of incandescent lamp filament to constitute the novel current-limiting resistance of self-adaptation.Self-adaptation adjustable resistance R is in series by resistance and incandescent lamp bulb, and current-limiting resistance is too small when preventing that bulb has just started under the metallic earthing failure condition, two resistance of having connected.Hot resistance according to the ordinary incandescent lamp bubble is bigger than cold-state resistance, and filament resistance increases with the rising of temperature, and is the current-limiting resistance of the feature formation self-adaptation adjusting of nonlinear relationship significantly.During one-phase earthing failure in electric distribution network, grounding transformer neutral point voltage U
NWith fault transition resistance R
gDifferent and different.Grounding transformer neutral point voltage U
NWith fault transition resistance R
gDifferent Changing Patterns are: when metallic earthing fault (R takes place
g=0 Ω) time, U
NReach maximal value and equal the power distribution network phase voltage.With the increase of transition resistance, neutral point voltage U
NReduce, work as R
gWhen singlephase earth fault does not promptly take place in=∞, U
NBe minimum value U
N=0V.
Work as R
gDuring=0 Ω, U
NEqual maximal value, promptly be added in the voltage maximum of series connection on the incandescent lamp, according to the resistance characteristic of incandescent filament, this moment the incandescent lamp filament the resistance maximum, along with R
gIncrease, U
NReduce, promptly be added in the voltage of series connection on the incandescent lamp along with reducing, the resistance of incandescent lamp filament is also along with reducing, and as seen the current-limiting resistance that is made of ordinary incandescent lamp can be regulated size automatically with failure condition.
The beneficial effects of the utility model are: simple in structure, easy to use, current limitation effect is good.
The non-vanishing characteristics of neutral point voltage-to-ground that produce when (1) utilizing fault dexterously allow it provide power supply for direct-flow signal generator, and utilize the primary winding of grounding transformer that direct current is injected failure system;
(2) because the DC current of injecting only has flow cycle mutually in the fault of faulty line, so have DC current to flow through in the faulty line and do not have DC current to flow through in the non-fault line, make failure criterion significant difference between faulty line and the non-fault line, thereby improved the order of accuarcy of route selection;
(3) characteristics according to the DC current flow cycle can realize localization of fault, and the utility model utilization is surveyed the method for injecting DC current along faulty line and realized localization of fault;
(4) the route selection orientation problem in the time of can solving high transition Resistance Fault;
(5) regulate the size of injecting DC current according to physical fault situation self-adaptation, can satisfy the requirement of detector accuracy of detection, do not make the DC current that flows through on the circuit excessive again.
Description of drawings
Fig. 1 is the graph of a relation of incandescent light electrical quantity and voltage, and wherein voltage is U, and power is P, and luminous flux is Φ, and luminescence efficiency is η, and the life-span is τ;
Fig. 2 is a direct current injection type route selecting positioning principle synoptic diagram;
Fig. 3 is the adjusting measure of traditional current-limiting resistance;
Fig. 4 is a self-adaptation adjustable resistance structural representation of the present utility model;
Fig. 5 is the R-U family curve of 220V 100W ordinary incandescent lamp.
Wherein, 1. grounding transformer, 2. control device, 3. voltage transformer (VT), 4. DC current generator.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing and embodiment.
Among Fig. 2, Fig. 4, it comprises grounding transformer 1, DC current generator 4, control device 2; Wherein grounding transformer 1 is received on the system busbar, gets the power supply of neutral point voltage-to-ground as the DC current generator when the system failure, and injects direct current by the primary winding of grounding transformer 1 to failure system; Connect the DC current generator between the neutral point N of grounding transformer 1 primary side and the earth, control device 2 is received the secondary side of bus-bar potential transformer 3, whether the monitoring distribution system singlephase earth fault takes place, and the switching of control DC current, measures the size of injecting DC current simultaneously; Described DC current generator is made of silicon stack D serial connection self-adaptation adjustable resistance R and fling-cut switch K, direct current measurement sensor MA.Self-adaptation adjustable resistance R is in series by current-limiting resistance and at least one incandescent lamp of two series connection.Silicon stack D rectification produces DC current, and the crosstalk resistance R of institute is a current-limiting resistance, the input and the excision of fling-cut switch K control DC current; Direct current measurement sensor MA is used for measuring the size of injecting direct current.
The R-U of " 220V 100W " common bulb of measuring figure, see shown in Figure 5,
Experiment situation during 6kV power distribution network metallic earthing fault as shown in Figure 4, current-limiting resistance is in series by the ordinary incandescent lamp bubble of the resistance of 2 100 ohm of 1000W and 10 220V 100W.
Become (6kV system) artificial earthing experiment in guard station, oil recovery factory, oil field, tested two kinds of ground connection situations: metallic earthing (transition resistance R
g=0 Ω) and high resistance ground situation (transition resistance R
g=2400 Ω).Under above-mentioned two kinds of current-limiting resistance situations, record injection DC current such as following table with UT203 clamp on amperemeter zero frequency span.
As seen, incandescent lamp has played good current limitation effect.
Claims (3)
1, a kind of direct current injection type route selecting locating device that adopts the self-adaptation adjustable resistance, it comprises grounding transformer, DC current generator, control device; Wherein grounding transformer is received on the system busbar, gets the power supply of neutral point voltage-to-ground as the DC current generator when the system failure, and injects direct current by the primary winding of grounding transformer to failure system; Connect the DC current generator between the neutral point N of grounding transformer primary side and the earth, control device is received the secondary side of bus-bar potential transformer, whether the monitoring distribution system singlephase earth fault takes place, and the switching of control DC current, measure the size of injecting DC current simultaneously, it is characterized in that: described DC current generator is made of silicon stack D serial connection self-adaptation adjustable resistance R and fling-cut switch K, direct current measurement sensor MA.
2, the direct current injection type route selecting locating device of employing self-adaptation adjustable resistance according to claim 1 is characterized in that: described self-adaptation adjustable resistance R is in series by at least one current-limiting resistance and at least one incandescent lamp.
3, the direct current injection type route selecting locating device of employing self-adaptation adjustable resistance according to claim 1, it is characterized in that: described current-limiting resistance has two, and they are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200227467U CN201359630Y (en) | 2009-03-03 | 2009-03-03 | DC injection-type line selection and positioning device adopting self-adapting adjustable resistor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200227467U CN201359630Y (en) | 2009-03-03 | 2009-03-03 | DC injection-type line selection and positioning device adopting self-adapting adjustable resistor |
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| CNU2009200227467U Expired - Fee Related CN201359630Y (en) | 2009-03-03 | 2009-03-03 | DC injection-type line selection and positioning device adopting self-adapting adjustable resistor |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236061A (en) * | 2010-04-23 | 2011-11-09 | 吴昌德 | Method for verifying single-phase grounded fault phase of small current grounding system |
| CN102749553A (en) * | 2011-04-22 | 2012-10-24 | 上海市电力公司 | Automatic positioning device for grounding failure of power transmission line |
| CN102749486A (en) * | 2011-04-22 | 2012-10-24 | 上海市电力公司 | Signal source equipment used for automatic positioning device of transmission line ground fault |
| CN103207350A (en) * | 2012-01-17 | 2013-07-17 | 成都信息工程学院 | Low voltage direct current power distribution fault line selection method |
| CN103558506A (en) * | 2013-10-25 | 2014-02-05 | 国家电网公司 | Method and device for searching for ground faults of non-injection type direct current system |
| CN104092206A (en) * | 2014-06-20 | 2014-10-08 | 国家电网公司 | Power distribution network grounding self-adaptive control system and method |
| CN105159378A (en) * | 2015-08-06 | 2015-12-16 | 保定上为电气科技有限公司 | Fault line selection auxiliary signal control system and control method for same |
| CN105182157A (en) * | 2015-09-07 | 2015-12-23 | 江苏省电力公司泰州供电公司 | Neutral point multi-point grounding detection device based on high-accuracy detection current |
| CN111398732A (en) * | 2020-03-14 | 2020-07-10 | 华中科技大学 | Power distribution network system based on active control of ground potential fluctuation and fault identification method thereof |
| CN112986862A (en) * | 2021-04-27 | 2021-06-18 | 重庆大学 | Single-phase earth fault identification method of small current grounding system |
-
2009
- 2009-03-03 CN CNU2009200227467U patent/CN201359630Y/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236061B (en) * | 2010-04-23 | 2014-04-02 | 安徽合肥瑞德尔电气自动化有限公司 | Method for verifying single-phase grounded fault phase of small current grounding system |
| CN102236061A (en) * | 2010-04-23 | 2011-11-09 | 吴昌德 | Method for verifying single-phase grounded fault phase of small current grounding system |
| CN102749553A (en) * | 2011-04-22 | 2012-10-24 | 上海市电力公司 | Automatic positioning device for grounding failure of power transmission line |
| CN102749486A (en) * | 2011-04-22 | 2012-10-24 | 上海市电力公司 | Signal source equipment used for automatic positioning device of transmission line ground fault |
| CN103207350A (en) * | 2012-01-17 | 2013-07-17 | 成都信息工程学院 | Low voltage direct current power distribution fault line selection method |
| CN103558506B (en) * | 2013-10-25 | 2016-06-15 | 国家电网公司 | Non-implanted formula DC system earth fault lookup method and device thereof |
| CN103558506A (en) * | 2013-10-25 | 2014-02-05 | 国家电网公司 | Method and device for searching for ground faults of non-injection type direct current system |
| CN104092206A (en) * | 2014-06-20 | 2014-10-08 | 国家电网公司 | Power distribution network grounding self-adaptive control system and method |
| CN104092206B (en) * | 2014-06-20 | 2017-03-22 | 国家电网公司 | Power distribution network grounding self-adaptive control system and method |
| CN105159378A (en) * | 2015-08-06 | 2015-12-16 | 保定上为电气科技有限公司 | Fault line selection auxiliary signal control system and control method for same |
| CN105182157A (en) * | 2015-09-07 | 2015-12-23 | 江苏省电力公司泰州供电公司 | Neutral point multi-point grounding detection device based on high-accuracy detection current |
| CN111398732A (en) * | 2020-03-14 | 2020-07-10 | 华中科技大学 | Power distribution network system based on active control of ground potential fluctuation and fault identification method thereof |
| CN111398732B (en) * | 2020-03-14 | 2020-12-29 | 华中科技大学 | Power distribution network system based on active control of ground potential fluctuation and fault identification method thereof |
| CN112986862A (en) * | 2021-04-27 | 2021-06-18 | 重庆大学 | Single-phase earth fault identification method of small current grounding system |
| CN112986862B (en) * | 2021-04-27 | 2024-04-09 | 重庆大学 | Power distribution network fault indicator sensitivity improving method based on neutral point resistance control |
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Legal Events
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091209 Termination date: 20120303 |