CN204945259U - Based on the distribution line ground wire detector that three-phase symmetric voltage injects - Google Patents
Based on the distribution line ground wire detector that three-phase symmetric voltage injects Download PDFInfo
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Abstract
The utility model relates to a kind of distribution line ground wire detector injected based on three-phase symmetric voltage.Distribution line to be measured is injected by exporting three-phase symmetrical detection voltage, detect the current flow of arbitrary phase in distribution line to be measured, voltage and current flow is detected according to three-phase symmetrical, judge whether there is ground wire in distribution line to be measured, when there is ground wire in distribution line to be measured, control warning device and to give the alarm signal.The distribution line ground wire detector based on three-phase symmetric voltage injection that the utility model proposes effectively can judge whether distribution line to be measured exists temporary ground wire, prevent line with ground or grounding switch power transmission, reduce the possibility that temporary ground wire is undetected, guarantee the safety of work about electric power personnel.
Description
Technical field
The utility model relates to electric power network field, particularly relates to distribution line ground wire detector.
Background technology
It is an important ring in distribution operation that distribution line connects ground wire temporarily, in the maintenance, transformation process of distribution line, must mount temporary ground wire, to ensure the safety of repair apparatus and staff.After maintenance and transformation process complete, must remove temporary ground wire and relevant apparatus, transformer station could combined floodgate power transmission.If before combined floodgate power transmission, still have ground wire not remove completely, " line combined floodgate power transmission with ground " accident, i.e. three-phase shortcircuit just can occur.After there is this three-phase shortcircuit situation, the electric current in circuit can increase suddenly, not only destroys controller switching equipment itself, causes part distribution region to paralyse, more can endanger the personal safety of work about electric power personnel, cause tremendous influence.
Occur to prevent band temporary ground wire or this " pernicious maloperation " accident of grounding switch power transmission, work about electric power personnel have installed " five prevent " system in transformer station, by to a series of Logic judgment and electrical interlocks and mechanical lock locking, serve certain effect to what prevent this misoperation fault.Although " five prevent " device can prevent band temporary ground wire or this electric fault-operation accident of grounding switch combined floodgate power transmission, first existing " five prevent " device can not solve temporary ground wire on maintenance circuit whether dismounting problem; Secondly, can not be used for line maintenance carry out security monitoring and cause occurring leaking, the possibility of dismounting ground wire; And it can not make dispatcher understand ground wire situation of removing to make scheduling issue orders combined floodgate power transmission by feedback information by mistake.So, " five prevent " system should there is many defects and deficiency.
In addition, in grid and transformer station, although there is many monitoring systems and pick-up unit.But due to the complicacy of distribution line and the otherness of Cleaning Principle, these systems and equipment the temporary ground wire not being suitable for distribution line detect.So work about electric power personnel face how effectively to detect the problem that whether there is temporary ground wire in distribution line.
Utility model content
Based on this, be necessary for how detecting the problem that whether there is ground wire in distribution line, a kind of distribution line ground wire detector injected based on three-phase symmetric voltage is provided, comprises and detect voltage output device, current sampling device, controller and warning device;
Detect voltage output device, be bi-directionally connected with controller, detecting voltage for exporting three-phase symmetrical, detecting voltage output device, also for being connected with distribution line to be measured, three-phase symmetrical being detected voltage and injecting distribution line to be measured;
Current sampling device, for being connected with distribution line to be measured, detects the current flow of arbitrary phase in distribution line to be measured;
Controller is connected with warning device, and controller detects voltage and current flow according to three-phase symmetrical, judges whether there is ground wire in distribution line to be measured, when there is ground wire in distribution line to be measured, controlling warning device and to give the alarm signal.
The distribution line ground wire detector based on three-phase symmetric voltage injection that the utility model proposes effectively can judge whether distribution line to be measured exists temporary ground wire, and send alarm signal, prevent line with ground or grounding switch power transmission, reduce the possibility that temporary ground wire is undetected, guarantee the safety of work about electric power personnel.
Accompanying drawing explanation
Fig. 1 is the structural drawing based on an embodiment of the distribution line ground wire detector of three-phase symmetric voltage injection in the utility model;
Fig. 2 is the structural drawing based on another embodiment of the distribution line ground wire detector of three-phase symmetric voltage injection in the utility model;
Fig. 3 is the structural drawing based on an embodiment of the three-phase full-bridge inverting circuit of the distribution line ground wire detector of three-phase symmetric voltage injection in the utility model;
Fig. 4 is the structural drawing based on a metal-oxide-semiconductor driving circuit embodiment of the distribution line ground wire detector of three-phase symmetric voltage injection in the utility model;
Fig. 5 is the structural drawing based on another embodiment of the distribution line ground wire detector of three-phase symmetric voltage injection in the utility model;
Fig. 6 is the structural drawing based on another embodiment of the distribution line ground wire detector of three-phase symmetric voltage injection in the utility model;
Fig. 7 is the structural drawing based on another embodiment of the distribution line ground wire detector of three-phase symmetric voltage injection in the utility model;
Fig. 8 is the structural drawing based on another embodiment of the distribution line ground wire detector of three-phase symmetric voltage injection in the utility model;
Fig. 9 is the structural drawing based on another embodiment of the distribution line ground wire detector of three-phase symmetric voltage injection in the utility model.
Embodiment
As shown in Figure 1, show an embodiment of the present utility model, a kind of distribution line ground wire detector injected based on three-phase symmetric voltage, comprises and detects voltage output device 100, current sampling device 200, controller 300 and warning device 400.
Detecting voltage output device 100, be bi-directionally connected with controller 300, detecting voltage for exporting three-phase symmetrical.Detect voltage output device 100, also for being connected with distribution line to be measured, three-phase symmetrical being detected voltage and injecting distribution line to be measured.
Current sampling device 200, for being connected with distribution line to be measured, detects the current flow of arbitrary phase in distribution line to be measured.
Controller 300 is connected with warning device 400, detects voltage and current flow, judge whether there is ground wire in distribution line to be measured according to three-phase symmetrical, when there is ground wire in distribution line to be measured, controlling warning device and to give the alarm signal.
Concrete, work about electric power personnel are after completing the maintenance to certain three-phase distribution circuit, can this distribution line ground wire detector injected based on three-phase symmetric voltage be received on this distribution line to be measured, start the detection voltage output device of this device, export three-phase symmetrical and detect voltage, wherein three-phase symmetrical is that effective value is identical, the three-phase voltage of phase place mutual deviation 120 degree, injects distribution line to be measured.Now, with or without temporary ground wire on distribution line to be measured, the electric current impact produced it is very large.So, the current flow in voltage and distribution line can be detected according to three-phase symmetrical, judge whether there is ground wire in distribution line to be measured.Further, because the detection voltage inputing to distribution line to be measured is three-phase symmetric voltage, so the effective value of three-phase voltage is identical, phase place mutual deviation 120 degree, three-phase vector sum is 0, by equivalent resistance between elimination distribution line ground wire to be measured and ground on the impact of sample rate current, reduce the possibility of erroneous judgement.Therefore, the distribution line ground wire detector based on three-phase symmetric voltage injection that the utility model proposes effectively can judge whether distribution line to be measured exists temporary ground wire, prevent line with ground or grounding switch power transmission, reduce the possibility that temporary ground wire is undetected, guarantee the safety of work about electric power personnel.
Concrete, as shown in Figure 2, detect voltage output device 100, comprise power circuit 110, booster circuit 120, three-phase full-bridge inverting circuit 130, metal-oxide-semiconductor driving circuit 140, voltage sampling circuit 150 and distribution line interface 160.
Power circuit 110, booster circuit 120 are connected successively with three-phase full-bridge inverting circuit 130, three-phase full-bridge inverting circuit 130 is also connected with metal-oxide-semiconductor driving circuit 140, voltage sampling circuit 150 and distribution line interface 160, voltage sampling circuit 150 is also connected with controller 300 and distribution line interface 160, metal-oxide-semiconductor driving circuit 140 is also connected with controller 300, and distribution line interface 160 is for being connected with distribution line to be measured.
Preferably, supply voltage 110 can be lithium and gathers battery.Booster circuit 120 can be Boost circuit.Three-phase full-bridge inverting circuit 130 can be as shown in Figure 3, comprise 6 MOS switching tube Q1-Q6, 3 inductance L 1-L3, 4 electric capacity C1-C4, 6 resistance R1-R6 and 1 diode D1, the anode of diode D1 is connected with the power input VCC of 24V, its negative electrode respectively with one end and the MOS switching tube Q1 of electric capacity C1, Q3, the source electrode of Q5 connects, the drain electrode of MOS switching tube Q1 respectively with one end of resistance R1, one end of inductance L 1 is connected with the source electrode of MOS switching tube Q2, the drain electrode of MOS switching tube Q3 respectively with one end of resistance R102, one end of inductance L 2 is connected with the source electrode of MOS switching tube Q4, the drain electrode of metal-oxide-semiconductor Q5 respectively with one end of resistance R3, one end of inductance L 3 is connected with the source electrode of MOS switching tube Q6, the other end of resistance R1 is connected with the grid of MOS switching tube Q1 and peripheral control signal G-Q1 respectively, the other end of resistance R2 is connected with the grid of MOS switching tube Q3 and peripheral control signal G-Q3 respectively, the other end of resistance R3 is connected with the grid of MOS switching tube Q5 and peripheral control signal G-Q5 respectively, the other end of electric capacity C1 respectively with ground wire RGND, resistance R4, resistance R5, one end of resistance R6 and MOS switching tube Q2, Q4, the drain electrode of Q6 connects, the other end of resistance R4 is connected with the grid of MOS switching tube Q2 and peripheral control signal G-Q2 respectively, the other end of resistance R5 is connected with the grid of MOS switching tube Q4 and peripheral control signal G-Q4 respectively, the other end of resistance R6 is connected with the grid of MOS switching tube Q6 and peripheral control signal G-Q6 respectively, the other end of inductance L 1 respectively with A phase positive power source terminal, one end of electric capacity C2 connects, the other end of inductance L 2 respectively with B phase positive power source terminal, one end of electric capacity C3 connects, the other end of inductance L 3 respectively with C phase positive power source terminal, one end of electric capacity C4 connects, electric capacity C2, C3, the equal ground connection of the other end of C4.Metal-oxide-semiconductor driving circuit 140 as shown in Figure 4, comprise chip I R2110, 5 electric capacity C5-C9, 2 resistance R7-R8 and 1 diode D2, the pin 9Vdd of chip I R2110 is connected with one end of 3.3V power supply and electric capacity C5 respectively, the pin one 4Vss of chip I R2110 is connected with the other end of electric capacity C5 and ground wire DGND respectively, the pin one 0 of chip I R2110, 12 respectively with the pulse control signal PWM1 of controller 300, PWM2 connects, the pin 7Ho of chip I R2110 is connected with one end of resistance R7, the other end of resistance R7 exports control signal G-Q1 to three-phase full-bridge inverting circuit 130, the pin one Lo of chip I R2110 is connected with one end of resistance R8, the other end of resistance R8 exports control signal G-Q2 to three-phase full-bridge inverting circuit 130, pin 6 and the electric capacity C6 of chip I R2110, one end of C7 is connected with the negative electrode of diode D2, pin 5 and the electric capacity C6 of chip I R2110, the other end of C7 connects, pin 3 and the electric capacity C8 of chip I R2110, one end of C9 and the anode of diode D2, 12V power input connects, the pin two of chip I R2110 and electric capacity C8, the other end of C9 is connected with ground wire AGND.
Known see Fig. 2-4, the specific works process detecting voltage output device 100 is: power circuit 110 provides the supply voltage of 12V, 35V DC voltage is produced after booster circuit 120 DC boosting, input three-phase full-bridge inverting circuit 130, after three-phase full-bridge inverting circuit 130 inversion, produce that effective value is constant, the three-phase symmetrical of frequency-adjustable detects voltage, and input voltage sample circuit 150.Voltage sampling circuit 150 is sampled each ADC port detecting voltage input control device 300 mutually, each mutually the detect voltage of controller 300 to sampling carries out voltage PI control, and output amplitude is 3.3V, complementary pulse control signal PWM1-PWM6 metal-oxide-semiconductor driving circuit extremely as shown in Figure 4.For pulse control signal PWM1, PWM2, that is: pulse control signal PWM1, PWM2 are exported to the pin one 0,12 of IR2110 chip, amplitude is drive singal G-Q1, G-Q2 that the pulse control signal of 3.3V is converted into that amplitude is 12V by this IR2110 chip, the grid of MOS switching tube Q1, Q2 of three-phase full-bridge inverting circuit as shown in Figure 3 is exported to through pin 7,1, control this to MOS switching tube Q1, Q2 conducting, three-phase full-bridge inverting circuit is produced, and a phase constant amplitude is 15V, the A phase of frequency-adjustable detects voltage U a.Process is similar therewith, can produce other two symmetrical detection voltage U b, Uc.This three-phase symmetrical is detected voltage and injects distribution line to be measured through high pressure bar by distribution line interface 160 again.
Preferably, in this embodiment, metal-oxide-semiconductor can be selected but be not limited only to IRF540.
Preferably, as shown in Figure 6, detect voltage output device 100 and also comprise LC filtering circuit 170, be connected with three-phase full-bridge inverting circuit 130 and voltage sampling circuit 150, filtering is carried out to sampled voltage.To obtain the better three-phase symmetrical of waveform detecting voltage.
As shown in Figure 6, current sampling device 200, comprises current transformer 210, first signal conditioning circuit 220, filtering circuit 230 and the first mu balanced circuit 240 that connect successively.Current transformer 210 is sampled the current flow of any phase on distribution line to be measured, nurse one's health through the first signal conditioning circuit 220, filtering circuit 230 filtering and the first mu balanced circuit 240 voltage stabilizing control after input control device 300.Concrete, current transformer 210 is optional but be not limited only to Hall current sensor HBC-AS5, required 5V power supply gathers battery by lithium and obtains through power module, and filtering circuit 230 is optional but be not limited only to second order bandwidth-limited circuit, forms active second order bandpass filtering by OPA4427.
Controller 300 can select dsp chip TMS320F2812, through the current flow of the detection voltage and current sample device 200 of ADC port accepts voltage sampling circuit 150, according to detection voltage and current flow, judge whether there is ground wire in distribution line to be measured, when there is ground wire in distribution line to be measured, controlling warning device and to give the alarm signal.
In one embodiment, controller 300, obtaining current threshold for detecting voltage according to three-phase symmetrical, according to the size of current flow and current threshold, judging whether there is ground wire in distribution line to be measured.
As shown in Figure 7, in another embodiment, the distribution line ground wire detector injected based on three-phase symmetric voltage also comprises input media 500, is connected, for inputting the induction reactance value threshold value of distribution line to be measured with controller 300.
Controller 300, detects according to three-phase symmetrical the current induction reactance value that voltage and current flow obtain any phase in distribution line to be measured, when current induction reactance value is greater than induction reactance value threshold value, controls warning device 400 and to give the alarm signal.
Concrete, input media 500 receives the induction reactance value threshold value that work about electric power personnel calculate according to soil regime, environmental factor, weather condition near distribution line to be measured etc.
Controller 300 calculates the current induction reactance value of any phase in distribution line to be measured according to three-phase symmetrical detection voltage and current flow, namely utilizes impedance method, adopts formula (1) to calculate current induction reactance value to be:
X
m＝U
msinα/I
m(1)
Wherein, U
many phase produced for detecting voltage generating module detects voltage effective value, I
mfor the current flow effective value of any phase of current detection module sampling, X
mfor current induction reactance value.
Adopt the more current induction reactance value X of comparer
mwith the size of induction reactance value threshold value, when current induction reactance value is greater than induction reactance value threshold value, judge to there is not ground wire in distribution line to be measured, controller 300 does not send control signal, when current induction reactance value is not more than induction reactance value threshold value, judge to there is ground wire in distribution line to be measured, controller 300 sends control signal, controls warning device 400 and to give the alarm signal.
In this embodiment, input media 500 receives the induction reactance value threshold value calculated according to soil regime, environmental factor, weather condition near three-phase distribution circuit to be measured etc., as basis for estimation, judge whether the current induction reactance value of the arbitrary phase of distribution line to be measured is greater than this threshold value, infers in this distribution line to be measured whether there is temporary ground wire.Because the selected of basis for estimation takes into full account distribution line to be measured itself and surrounding environment thereof, so targetedly, judgment accuracy can be improved further.
In another embodiment, controller 300, time also for there is ground wire in distribution line to be measured, the distance between computation and measurement point and the earth point of ground wire, computing formula is:
L
f＝X
m/X
0(2)
Wherein, X
mfor current induction reactance value, X
0for the induction reactance value of every km circuit, L
fthree-phase symmetrical for frequency f detects the distance between measurement point and the earth point of ground wire calculated under voltage.
In this embodiment, controller 300 can distance between computation and measurement point and the earth point of ground wire, facilitate work about electric power personnel when learn there is ground wire in distribution line to be measured, know the distance between measurement point and the earth point of ground wire further, thus fast and easy determination temporary grounding line position removing, increase work efficiency.
In another embodiment, controller 300, also for the distance between weighted calculation measurement point and the earth point of ground wire, computing formula is:
L＝k
1L
1+k
2L
2+…+k
nL
n(3)
Wherein, L
1three-phase symmetrical for first frequency detects the distance between measurement point and the earth point of ground wire calculated under voltage, L
2three-phase symmetrical for second frequency detects the distance between measurement point and the earth point of ground wire calculated under voltage ... L
kthree-phase symmetrical for kth frequency detects the distance between measurement point and the earth point of ground wire calculated under voltage, k
1, k
1k
nfor weighting coefficient, k
1+ k
2+ ... + k
n=1.
Concrete, detect voltage output device 100 and produce different frequency f successively
1, f
2..., f
nthree-phase symmetrical detect voltage U
1, U
2..., U
n, input distribution line to be measured through high pressure bar, the detection voltage U of the corresponding different frequency of current sampling device 200
1, U
2..., U
n, the current flow I of different frequency of sampling successively
1, I
2..., I
n, controller 300 is according to the detection voltage U of different frequency
1, U
2..., U
nwith the current flow I of different frequency
1, I
2..., I
n, calculate the current induction reactance value under different frequency according to formula (1), and then according to the distance L between the measurement point under formula (2) calculating different frequency and the earth point of ground wire
1, L
2l
n.And set weighting coefficient k corresponding to each frequency
1, k
2k
n(wherein, k
1+ k
2+ ... + k
n=1) distance that, then can obtain between the measurement point after weighted calculation and the earth point of ground wire according to formula (3).
In this embodiment, distance between the measurement point obtained under controller 300 weighted calculation different frequency and the earth point of ground wire, the different frequency that further can reduce three-phase symmetrical detection voltage chooses the impact of estimation of adjusting the distance, further raising estimation precision, for work about electric power personnel provide more accurate position to instruct, conveniently find ground wire position accurately and remove more rapidly.
As shown in Figure 8, in another embodiment, based on the distribution line ground wire detector that three-phase symmetric voltage injects, also comprise circuit residual voltage detecting device 600, for detecting the remaining magnitude of voltage of distribution line to be measured, control whether conduction detection voltage output device 100 according to the size of remaining magnitude of voltage.
Concrete, circuit residual voltage detecting device 600 comprises voltage transformer (VT) 610, secondary signal modulate circuit 620, second mu balanced circuit 630 and relay circuit 640.
Voltage transformer (VT) 610, secondary signal modulate circuit 620, second mu balanced circuit 630 are connected successively with controller 300, voltage transformer (VT) 610, for detecting the remaining magnitude of voltage of distribution line to be measured, input control device 300 after secondary signal modulate circuit 620 and the process of the second mu balanced circuit 630.
Relay circuit 640 is connected with controller 300, and the normally opened contact of relay circuit 640 is connected with three-phase full-bridge inverting circuit 130, and neutral end is connected with distribution line interface 160.
Now, input media 500, also for receiving remaining voltage value threshold, controller 300 is when remaining magnitude of voltage is greater than remaining voltage value threshold, the normally opened contact of control relay circuit 640 is failure to actuate, and blocks three-phase full-bridge inverting circuit 130 and distribution line interface 160; When remaining magnitude of voltage is not more than remaining voltage value threshold, the normally opened contact action of control relay circuit 640, conducting three-phase full-bridge inverting circuit 130 and distribution line interface 160.
Concrete, whether there is ground wire in open detection distribution line to be measured before, circuit residual voltage detection module 600 is accessed distribution line to be measured by work about electric power personnel, detect the remaining magnitude of voltage input control device 300 of distribution line to be measured, this remaining magnitude of voltage analyzed by controller 300, control relay circuit 640 whether action, to control the whether conducting of three-phase full-bridge inverting circuit 130 and distribution line interface 160, and then control three-phase symmetrical and detect voltage and whether can inject three-phase distribution circuit to be measured smoothly.Preferably, remaining voltage value threshold can by work about electric power personnel rule of thumb or human body bear voltage range and set, and be directly stored in the storage unit of controller 300, input without the need to input media 500.Preferably, voltage transformer (VT) 610 is selected but is not limited only to ZMPT107 Micro-Transformer of Voltage, and secondary signal modulate circuit 620 is selected but is not limited only to OPA4227 operational amplifier, and the second mu balanced circuit 630 is selected but is not limited only to stabilivolt IN4728/3.3V.
In this embodiment, the distribution line ground wire detector that should inject based on three-phase symmetric voltage, can be measured before whether electric line exist the detection of temporary ground wire treating, according to magnitude of voltage remaining in distribution line to be measured, control three-phase symmetrical detection voltage and can inject distribution line to be measured smoothly, when the remaining voltage in distribution line to be measured is greater than remaining voltage threshold, the normally opened contact of guard relay circuit 640 is failure to actuate, block three-phase full-bridge inverting circuit and distribution line interface, make three-phase symmetrical detect voltage and can not inject distribution line to be measured, larger remaining voltage can be avoided to damage pick-up unit and work about electric power personnel.
As shown in Figure 9, in another embodiment, warning device 500, comprise LCD display circuit 510, LED circuit 520, buzzer circuit 530 one or more.
Concrete, according to the judged result of controller 300, if there is ground wire in distribution line to be measured, then controller 300 control LCD display circuit 510 show the red LED lamp of " distant place exists ground wire " or/and LED circuit 520 bright or/and buzzer circuit 530 sound, work about electric power personnel are provided alarm signal; If there is not ground wire in distribution line to be measured, then to show the green LED lamp of " distant place does not exist ground wire " or/and LED circuit 520 bright for controller 300 control LCD display circuit 510, or/and hummer 530 is not sounded, provide work about electric power personal security signal.
Preferably, when there is ground wire in distribution line to be measured, the distance between controller 300 control LCD display circuit 510 display measurement point and the earth point of ground wire, to instruct the general geographic position of work about electric power personnel ground wire.
Preferably, if when the remaining magnitude of voltage of distribution line to be measured is greater than remaining voltage value threshold, controller 300 control LCD display circuit 510 also show the red LED lamp of " remaining magnitude of voltage is large " or/and LED circuit 520 bright or/and buzzer circuit 530 sound, work about electric power personnel are provided alarm signal; If when the remaining magnitude of voltage of distribution line to be measured is not more than remaining voltage value threshold, controller 300 control LCD display circuit 510 also show the green LED lamp of " remaining magnitude of voltage is little " or/and LED circuit 520 bright or/and buzzer circuit 530 do not sound, work about electric power personal security signal is provided.
Preferably, three-phase symmetrical detects constant amplitude, the frequency-adjustable of voltage, and frequency range is specially the Mid Frequency frequency of 200Hz ~ 500Hz.Because the frequency detecting voltage is higher, the impact of circuit on accuracy of detection is larger; Frequency is lower, and the easy disturbed signal of current signal floods.So three-phase symmetrical detects voltage and is preferably this Mid Frequency frequency, contribute to the accuracy improving judged result.Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (9)
1., based on the distribution line ground wire detector that three-phase symmetric voltage injects, comprise and detect voltage output device, current sampling device, controller and warning device;
Described detection voltage output device, is bi-directionally connected with described controller, detects voltage, described detection voltage output device for exporting three-phase symmetrical, also for being connected with distribution line to be measured, described three-phase symmetrical being detected voltage and injects described distribution line to be measured;
Described current sampling device, for being connected with described distribution line to be measured, detects the current flow of arbitrary phase in described distribution line to be measured;
Described controller is connected with described warning device, described controller detects voltage and described current flow according to described three-phase symmetrical, judge whether there is ground wire in described distribution line to be measured, when there is described ground wire in described distribution line to be measured, controlling warning device and to give the alarm signal.
2. the distribution line ground wire detector injected based on three-phase symmetric voltage according to claim 1, it is characterized in that, described detection voltage output device comprises power circuit, booster circuit, three-phase full-bridge inverting circuit, metal-oxide-semiconductor driving circuit, voltage sampling circuit and distribution line interface;
Described power circuit, described booster circuit are connected successively with described three-phase full-bridge inverting circuit, described three-phase full-bridge inverting circuit is also connected with described metal-oxide-semiconductor driving circuit, described voltage sampling circuit and described distribution line interface, described voltage sampling circuit is also connected with described controller and described distribution line interface, described metal-oxide-semiconductor driving circuit is also connected with described controller, and described distribution line interface is used for being connected with described distribution line to be measured.
3. the distribution line ground wire detector injected based on three-phase symmetric voltage according to claim 2, it is characterized in that, described detection voltage output device also comprises LC filtering circuit, is connected with described three-phase full-bridge inverting circuit and described voltage sampling circuit.
4. the distribution line ground wire detector injected based on three-phase symmetric voltage according to claim 1, it is characterized in that, described current sampling device, comprises the current transformer, the first signal conditioning circuit, filtering circuit and the first mu balanced circuit that connect successively;
Described current transformer is sampled the current flow of any phase on distribution line to be measured, after described first signal conditioning circuit conditioning, described filtering circuit filtering and described first mu balanced circuit voltage stabilizing control, input described controller.
5. the distribution line ground wire detector injected based on three-phase symmetric voltage according to claim 1-4 any one, it is characterized in that, also comprise input media, described input media is connected with described controller, for inputting the induction reactance value threshold value of distribution line to be measured; Described controller obtains the current induction reactance value of any phase in described distribution line to be measured according to described three-phase symmetrical detection voltage and described current flow, when described current induction reactance value is not more than described induction reactance value threshold value, controls described warning device and to give the alarm signal.
6. the distribution line ground wire detector injected based on three-phase symmetric voltage according to claim 5, it is characterized in that, also comprise circuit residual voltage detecting device, for detecting the remaining magnitude of voltage of described distribution line to be measured, control to detect voltage output device described in whether conducting according to the size of described remaining magnitude of voltage.
7. the distribution line ground wire detector injected based on three-phase symmetric voltage according to claim 6, it is characterized in that, described circuit residual voltage detecting device comprises voltage transformer (VT), secondary signal modulate circuit, the second mu balanced circuit and relay circuit;
Described voltage transformer (VT), described secondary signal modulate circuit, described second mu balanced circuit are connected successively with described controller, described voltage transformer (VT), for detecting the remaining magnitude of voltage of described distribution line to be measured, after described secondary signal modulate circuit and described second mu balanced circuit process, input described controller;
Described relay circuit is connected with described controller, and the normally opened contact of described relay circuit is connected with described three-phase full-bridge inverting circuit, and the neutral end of described relay circuit is connected with described distribution line interface;
Described input media, also for receiving remaining voltage value threshold, described controller is when described remaining magnitude of voltage is greater than described remaining voltage value threshold, and the normally opened contact controlling described relay circuit is failure to actuate, and blocks described three-phase full-bridge inverting circuit and described distribution line interface; When described remaining magnitude of voltage is not more than described remaining voltage value threshold, control the normally opened contact action of described relay circuit, three-phase full-bridge inverting circuit described in conducting and described distribution line interface.
8. according to claim 1-4,6-7 any one based on three-phase symmetric voltage inject distribution line ground wire detector, it is characterized in that, described warning device comprise LCD display circuit, LED circuit, buzzer circuit one or more.
9. the distribution line ground wire detector injected based on three-phase symmetric voltage according to claim 8, is characterized in that, described three-phase symmetrical detects constant amplitude, the frequency-adjustable of voltage, and frequency range is specially the Mid Frequency frequency of 200Hz ~ 500Hz.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108072784A (en) * | 2017-11-30 | 2018-05-25 | 南京四方亿能电力自动化有限公司 | A kind of distribution line residual voltage detection circuit based on single pulse Detection ＆ Controling |
| CN111123031A (en) * | 2019-12-18 | 2020-05-08 | 国网湖北省电力有限公司宜昌供电公司 | Fault detection method, low-voltage energy storage pre-operation set device, controller and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108072784A (en) * | 2017-11-30 | 2018-05-25 | 南京四方亿能电力自动化有限公司 | A kind of distribution line residual voltage detection circuit based on single pulse Detection ＆ Controling |
| CN108072784B (en) * | 2017-11-30 | 2020-03-17 | 南京四方亿能电力自动化有限公司 | Distribution lines residual voltage detection circuitry based on single pulse detects and control |
| CN111123031A (en) * | 2019-12-18 | 2020-05-08 | 国网湖北省电力有限公司宜昌供电公司 | Fault detection method, low-voltage energy storage pre-operation set device, controller and system |
| CN111123031B (en) * | 2019-12-18 | 2022-04-29 | 国网湖北省电力有限公司宜昌供电公司 | Fault detection method, low-voltage energy storage pre-operation set device, controller and system |
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