CN101696983A - Method and device for measuring neutral point of capacitance current of distribution network - Google Patents
Method and device for measuring neutral point of capacitance current of distribution network Download PDFInfo
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- CN101696983A CN101696983A CN200910044606A CN200910044606A CN101696983A CN 101696983 A CN101696983 A CN 101696983A CN 200910044606 A CN200910044606 A CN 200910044606A CN 200910044606 A CN200910044606 A CN 200910044606A CN 101696983 A CN101696983 A CN 101696983A
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Abstract
The invention discloses a method for measuring a neutral point of capacitance current of a distribution network, which comprises the following steps of collecting neutral point open circuit voltage U0 of the distribution network; grounding the neutral point and collecting a neutral point short circuit current I0d when the neutral point is grounded; and substituting the neutral point open circuit voltage U0, the neutral point short circuit current I0d and phase voltage UPhi during the normal operation of the distribution network, which are obtained in the steps, to obtain the capacitance current IC in the distribution network. The invention also discloses a measuring device using the method, which comprises voltage collecting unit (1), a current collecting unit (2), a processing unit (4) and a switch unit (7). The invention has the advantages of simple and convenient operation, accurate measurement, high intelligence, rapid measurement, strong anti-jamming capability, small volume, convenient carrying and wide application range, and is suitable for spot operation.
Description
Technical field
The present invention relates to the electric power safety field, be specifically related to a kind of neutral point measuring method and device of capacitance current of distribution network.
Background technology
Capacitance current is displacement current again, it is different from the directed electric current that forms that moves of electric charge, it does not really flow to the earth from the trouble spot, but because the equivalent current that capacitor charge and discharge causes, for the AC distribution net, because electric current is constantly to change, the capacitance current of this power distribution network also just exists all the time.Practical experience proves, if capacitance current greater than 11.4A, power distribution network is blow-out reliably just, thereby produces arcing ground over-voltage and may cause phase fault, causes to have a power failure and the device damage accident.Therefore measuring system capacitance current accurately, easily so that take corresponding safety practice when capacitance current exceeds standard, has very important significance for the safety of power distribution network.
The method of measuring capacitance current of distribution network at present mainly contains: direct earthing, additional capacitor method, signal injection method: directly earthing directly detects capacitance current with the single-phase earthing of power distribution network, owing to need make the power distribution network people for bearing once higher superpotential threat, particularly in the weak power distribution network that insulate, adopt the method especially dangerous; The capacitance current of additional capacitor method measuring system is under the uncompensated situation of system, inserts suitable electric capacity over the ground at the neutral point of transformer, measures the voltage-to-ground of neutral point, then the capacitance current of computing system.But this method is before implementing measurement, need theoretically the capacitance current of tested electrical network to be carried out earlier the estimation of complexity, determine the range ability of the capacity and the measurement instrument of building-out condenser, measuring process complexity, required time are longer, knowwhy and operant level to survey crew require height, and measuring error is relevant with external capacitor; And the charge effects of electric capacity is equivalent to produce a metallic earthing fault in electrical network in the moment of artificial ground, is unfavorable for safety, also can impact to system when external capacitor is excessive; The signal injection method is to inject the constant current frequency variation signal from voltage transformer secondary side, changes the frequency of injecting signal, makes resonance takes place in the system to measure the electrical network unbalanced earth fault capacitance current.When measuring, this method need add the constant current frequency conversion equipment, and operation is trouble too, its measuring process of difference at grounding Method is also different, test duration is longer in addition, the degree of unbalancedness of actual electric network is brought difficulty than conference to measurement, and the frequency selection purposes of injection constant current frequency variation signal is also bigger to the accuracy influence of measuring.The capacitance current measurement method of these power distribution networks has above-mentioned shortcoming, and the employed capacitance current of distribution network neutral point of these methods measurement mechanism also must be confined to its employed method.
Summary of the invention
The present invention is directed to the above-mentioned shortcoming of prior art, provide a kind of simple to operation, measure accurately, degree of intelligence is high, it is quick rapidly to measure, antijamming capability is strong, volume is little, be convenient for carrying, be suitable for the neutral point measuring method and the device of the capacitance current of distribution network of execute-in-place.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of neutral point measuring method of capacitance current of distribution network is characterized in that implementation step is as follows:
1) disconnects being connected between neutral point and the grounded screen, gather the neutral point open-circuit voltage U of power distribution network
0
2) with above-mentioned neutral ground, the neutral point short-circuit current I when gathering described neutral ground
0d
3) with step 1) and step 2) in the neutral point open-circuit voltage U that obtains
0, neutral point short-circuit current I
0dAnd the phase voltage U of power distribution network when normally moving
φBe updated to the capacitance current I that obtains in the following formula (1) in the power distribution network
C:
Further improvement as the neutral point measuring method of capacitance current of distribution network of the present invention: described neutral point is by switch element ground connection, and after step 1) was finished, described switch element closure was with described neutral ground.
The present invention also provides a kind of capacitance current of distribution network neutral point measurement mechanism, it comprises voltage acquisition unit, current acquisition unit, processing unit and switch element, described voltage acquisition unit links to each other with the neutral point of power distribution network, and described voltage acquisition unit is used to gather neutral point open-circuit voltage U
0Described switch element one end links to each other with the neutral point of power distribution network, described switch element is used to control described neutral ground, and described current acquisition unit is connected with the other end of switch element, the neutral point short-circuit current I when described current acquisition unit is used to gather neutral ground
0dDescribed processing unit is connected with the current acquisition unit with described voltage acquisition unit respectively, and described processing unit is used for the neutral point open-circuit voltage U according to input
0, neutral point short-circuit current I
0dPhase voltage U when normally moving with power distribution network
φCalculate the capacitance current I in the power distribution network
C
Further improvement as capacitance current of distribution network neutral point measurement mechanism of the present invention:
Described voltage acquisition unit is made of voltage transformer (VT) and alternating voltage-DC voltage converting unit, described voltage transformer (VT) one side is connected with described neutral point, opposite side is connected with alternating voltage-DC voltage converting unit, and described alternating voltage-DC voltage converting unit is used for exporting processing unit to after ac voltage signal with described voltage transformer (VT) collection is converted to d. c. voltage signal; Described current acquisition unit is made of current transformer and alternating current-DC voltage converting unit, described current transformer one end is connected with switch element, the other end links to each other with alternating current-DC voltage converting unit, and described alternating current-DC voltage converting unit is used for exporting processing unit to after current signal with the current transformer collection is converted to d. c. voltage signal;
Described switch element is made up of thyristor unit and thyristor trigger element, the input end of described thyristor trigger element is connected with processing unit, the output terminal of thyristor trigger element links to each other with the control end of thyristor unit, and the working end of thyristor unit is connected between current acquisition unit and the described neutral point; Described thyristor unit is in series by the thyristor groups more than two groups, and described thyristor groups is made up of the thyristor of two reverse parallel connections; Described thyristor groups is parallel with the capacitance resistance equalizer circuit, and described capacitance resistance equalizer circuit is formed by resistance and capacitances in series;
Described processing unit be used to show that the display unit of result of calculation links to each other, described processing unit links to each other with the input block that is used for control switch unit.
The present invention has following advantage: the present invention only need be connected to power network neutral point when measuring the capacitance current of power distribution network and get final product, the voltage of neutral point is lower, the measurement mechanism operating side is weak electricity system, hot line job is few, safe and reliable, the present invention carries out automated intelligent by single-chip microcomputer and measures capacitance current of distribution network, simple to operation, measure accurately, degree of intelligence is high, it is quick rapidly to measure; Measurement mechanism can be away from the electric field apart from each other of transmission line of electricity, measurement mechanism and the transmission line of electricity of power distribution network, and antijamming capability is strong, can effectively reduce electric field disturbs; Constitute because device is mainly electronic component, so the present invention also has the advantage that volume is little, be convenient for carrying, be suitable for execute-in-place.Owing to adopted the ground connection of switch element control neutral point, therefore quick more with respect to the manual method of switching of traditional employing, safety, and the effective two-way admittance of holding current of the mode of the thyristor groups by reverse parallel connection among the present invention, and on thyristor groups shunt capacitance resistance equalizer circuit, can effectively keep synchronous triggering, the serviceable life that can improve thyristor for thyristor groups.In addition, owing to generally all adopt the neutral by arc extinction coil grounding device in the 35KV power distribution network, therefore capacitance current neutral point measurement mechanism of the present invention is specially adapted to the power distribution network of 35KV.
Description of drawings
Fig. 1 is the neutral point measuring method process flow diagram of capacitance current of distribution network of the present invention;
Fig. 2 is the circuit block diagram of the embodiment of the invention;
Fig. 3 is the processing unit of the embodiment of the invention and the circuit diagram of periphery thereof;
Fig. 4 is the alternating voltage-DC voltage modular converter circuit diagram of the embodiment of the invention;
Fig. 5 is the alternating current-DC voltage modular converter circuit diagram of the embodiment of the invention;
Fig. 6 is the circuit diagram of the switch element of the embodiment of the invention.
Embodiment
As shown in Figure 2, in a kind of power distribution network, power distribution network has three-phase line A, B, C, and circuit A, B, C are intersected in neutral point D, and the single-phase measurement mechanism of capacitance current of the present invention is measured the capacitance current of power distribution network by neutral point D.As shown in Figure 1, the implementation step of the single-phase measuring method of capacitance current of distribution network of the present invention is as follows:
1) disconnects being connected between neutral point and the grounded screen, gather the neutral point open-circuit voltage U of power distribution network
0
2) with neutral point D ground connection, the neutral point short-circuit current I when gathering neutral point D ground connection
0d
3) with step 1) and step 2) in the neutral point open-circuit voltage U that obtains
0, neutral point short-circuit current I
0dAnd the phase voltage U of power distribution network when normally moving
φBe updated to the capacitance current I that obtains in the following formula (1) in the power distribution network
C:
The neutral point open circuit, promptly being equivalent to add electric capacity is zero electric capacity, its displacement voltage U
01It is exactly asymmetrical voltage.When the neutral point short circuit, be equivalent to neutral point and added a numerical value and equal infinitely-great electric capacity, its displacement voltage is zero.When neutral point D short circuit, when promptly adding electric capacity infinity circuit, add capacitor C
0→ ∞, U
01→ 0, when adding electric capacity, neutral point flows through the electric current I of this electric capacity
0cShort-circuit current I with neutral point D
OdSubstantially equate (I
Oc→ I
Od), when neutral point D opens a way, promptly add electric capacity when equalling zero, add capacitor C
0=0, U
01=U
0
Therefore displacement voltage U as can be known
01=U
0C/ (C+C
0)
Wherein C is the capacitive reactance of transmission line of electricity, U
01Be neutral point displacement voltage over the ground, neutral point voltage-to-ground when referring to during displacement voltage that circuit breaks down; U
0Neutral point voltage-to-ground during for the circuit operate as normal.
Therefore, the capacitive reactance C=C of transmission line of electricity
0U
01/ (U
0-U
01), multiply by ω U in both sides
φ, then have:
ωU
φ·C＝ωU
φ·C
0U
01/(U
0-U
01)＝ωC
0U
01·U
φ/(U
0-U
01)
Wherein ω is the frequency of operation of power distribution network, and general ω value is 50 hertz in China, U
φWork phase voltage for power distribution network.And ω CU
φBe the capacitive earth current I of power distribution network
c, ω C
oU
OlWhen adding electric capacity, flow through the electric current I of this electric capacity for neutral point
0c, therefore can derive:
I
c＝I
0c·U
φ/(U
0-U
01)
When neutral point D short circuit, when promptly adding electric capacity infinity circuit, add capacitor C
0→ ∞, U
01→ 0, I
0c→ I
0dSo, have:
I
c＝I
0d·U
φ/U
0
In sum, when measuring capacitance current of distribution network, because U by neutral point
φPhase voltage when normally moving for power distribution network is the known constant of power distribution network, for the three-phase distribution net of 35KV, then
So only need measure the open-circuit voltage U of neutral point
0, neutral point D short-circuit current I
0dCan calculate the capacitance current of power distribution network.
In order to realize quick measurement, by switch element 7 ground connection, after step 1) was finished, described switch element 7 closures were to realize the ground connection of neutral point D at neutral point D.For the safety of assurance device, in step 2) collect neutral point short-circuit current I
0dAfter, switch element 7 is closed automatically.
The neutral point measurement mechanism of capacitance current of distribution network of the present invention comprises voltage acquisition unit 1, current acquisition unit 2, processing unit 4 and switch element 7, described voltage acquisition unit 1 links to each other with the neutral point of power distribution network, and described voltage acquisition unit 1 is used to gather neutral point open-circuit voltage U
0Described switch element 7 one ends link to each other with the neutral point of power distribution network, described switch element 7 is used to control described neutral ground, and described current acquisition unit 2 is connected with the other end of switch element 7, the neutral point short-circuit current I when described current acquisition unit 2 is used to gather neutral ground
0dDescribed processing unit 4 is connected with current acquisition unit 2 with described voltage acquisition unit 1 respectively, and described processing unit 4 is used for the neutral point open-circuit voltage U according to input
0, neutral point short-circuit current I
0dPhase voltage U when normally moving with power distribution network
φCalculate the capacitance current I in the power distribution network
C
As shown in Figure 3, processing unit 4 is made of single chip computer AT 89S52 and peripheral circuit thereof, processing unit 4 adopts the X5045 chips as reset circuit, the CS pin of X5045, SO pin, SI pin, SCK pin respectively with the pin (P2.3～P2.6) link to each other of AT89S52.Display unit 6 is the LED charactron, this unit links to each other with P1.0～P1.7 and P2.1, the P2.2 of single-chip microcomputer respectively, sheet as the LED charactron after P2.1, P2.2 amplify through transistor Q1, Q2 selects port, P1.0～P1.7 is used for to LED charactron output displaying contents, a～h input port of the respectively corresponding eight sections LED charactrons of P1.0～P1.7.A/D converting unit 3 adopts the AD0809 chip, its IN0 links to each other with current acquisition unit 2, IN1 pin and voltage acquisition unit 1 output pin link to each other, the address input line ADDA of AD0809 links to each other with the P2.0 of single-chip microcomputer, be used for the corresponding analog input channel of gating, when P2.0 is 0, gating passage IN0, processing unit can read the neutral point short-circuit current I that current acquisition unit 2 is gathered
0dWhen P2.0 put 1, gating passage IN1, processing unit can read the neutral point open-circuit voltage U that voltage acquisition unit 1 is gathered
0A/D converting unit 3 adopts the AD0809 chip, its IN0 and IN1 pin respectively with current acquisition unit 2, voltage acquisition unit 1 output port link to each other, the address input line ADDA of AD0809 links to each other with the P2.0 of single-chip microcomputer, be used for the corresponding analog input channel of gating, when P2.0 is 0, gating passage IN0; When P2.0 puts 1, gating passage IN1, thus can control the input signal of AD0809 by P2.0; Output pin D0～D7 of AD0809 is connected to P0.0～P0.7 mouth of AT89S52 respectively, is used for that the digital signal after the conversion is sent into processing unit 4 and handles.Because AD0809 inside does not have clock circuit, required clock signal must be provided by the external world, usually frequency of utilization is 500KHZ, and the output frequency of single-chip microcomputer is 1/6 (2MHZ) of crystal oscillator frequency, so AD0809 be connected with clock generator SUN7474, the work clock of AD0809 is provided by SUN7474.Input block 5 is the switch S 1 on the INT1 pin that is connected to processor A T89S52, Closing Switch S1, the AT89S52 internal interrupt that can produce then, and in control signal of P2.7 pin output with switch element 7 conductings.
As shown in Figure 4, gathering voltage acquisition unit 1 is made of voltage transformer (VT) 11 and alternating voltage-DC voltage converting unit 12, voltage transformer (VT) 11 1 sides link to each other with neutral point D, opposite side links to each other with alternating voltage-DC voltage converting unit 12, alternating voltage-DC voltage converting unit 12 exports processing unit 4 to after being used for the ac voltage signal that voltage transformer (VT) 11 is gathered is converted to d. c. voltage signal.In the present embodiment, voltage transformer (VT) 11 no-load voltage ratios are 10000: 100, by this voltage transformer (VT), the high voltage of power distribution network can convert the low dc voltage signal that goes for processing unit processes to, the phase voltage of 35KV power distribution network is about 20KV in the present embodiment, the voltage of neutral point D was generally 0 to several hectovolts when system normally moved, and then was up to several volts through the output voltage behind the voltage transformer (VT).Because processing unit 4 can only be handled d. c. voltage signal, therefore need alternating voltage-DC voltage converting unit 12 that the ac voltage signal that voltage transformer (VT) 11 collects is converted to d. c. voltage signal, alternating voltage-DC voltage converting unit 12 is the full-wave rectification of employing operational amplifier and the circuit of capacitor filtering, this unit receives the ac voltage signal from voltage transformer (VT), IC3C is 10 times of AC amplifier, multiple is 1+R11/R10, IC3D is the negative output half-wave rectifying circuit, be summed into full-wave rectifying circuit with input signal, C13 is a filter capacitor, its capacity choose the contradictory relation that should take into account ripple and response speed, this element output signal is to the IN1 port of A/D converting unit 3 after conversion.
As shown in Figure 5, current acquisition unit 2 is made of current transformer 21 and alternating current-DC voltage converting unit 22, current transformer 21 1 ends link to each other with neutral point D by switch element 7, the other end links to each other with alternating current-DC voltage converting unit 22, alternating current-DC voltage converting unit 22 exports processing unit 4 to after being used for the ac current signal that current transformer 21 is gathered is converted to d. c. voltage signal.The no-load voltage ratio of current transformer 21 is 5: 1, is used for the big current conversion of partially installing capacitor is become can be used for the low dc voltage signal that weak electricity system is used.Alternating current-DC voltage converting unit 22 utilizes R2 to be converted into alternating voltage from the alternating current of neutral point D, by C6, R3, R4, D1, D2, IC3A alternating voltage is converted into DC voltage, for the resulting signal of conversion is met the demands, DC voltage is amplified through IC3B again, and output signal is to the IN0 port of A/D converting unit 3.
As shown in Figure 6, switch element 7 is made up of thyristor unit 71 and thyristor trigger element 72.The input end of thyristor trigger element 72 is connected with processing unit 4, output terminal links to each other with the control end of thyristor unit 71, and two working ends of thyristor unit 71 are connected between current acquisition unit 2 and the neutral point D, the conducting state of Control current collecting unit 2 and neutral point D.In order to realize the two-way admittance of AC signal, thyristor unit 71 is in series by two thyristor groups 711, and each thyristor groups 711 is formed by the thyristor reverse parallel connection of two same models.When the thyristor series connection is used, because the asynchronism to a certain extent that trigger circuit may exist, this nonsynchronous mistiming under high pressure may be caused the too high voltages that occurs moment on some thyristor, the inner structure of damaging thyristor, thereby causes the permanent damage of thyristor.Therefore the present invention suppresses Voltage unbalance by adding capacitance resistance equalizer circuit 712.Capacitance resistance equalizer circuit 712 is formed by a resistance and a capacitances in series, and each thyristor groups in parallel is in parallel with capacitance resistance equalizer circuit 712.Because thyristor unit 71 contains a plurality of thyristors, therefore in order to realize synchro control, the P2.7 port of AT89S52 is as the control input signals of thyristor trigger element 72, be respectively equipped with 4 output pins on the thyristor trigger element 72, be connected to the control end of each thyristor in the thyristor unit 71 successively.Behind the trigger switch S1, processing unit 4 will produce an interruption, therefore the P2.7 pin of AT89S52 can produce a signal, this signal is through thyristor trigger element 72, trigger thyristor unit 71, thyristor unit 71 is with neutral point D ground connection, and current acquisition unit 2 can collect neutral point short-circuit current I at this moment
0dThereby, realize the automatic access of neutral point.
Claims (8)
1. the neutral point measuring method of a capacitance current of distribution network is characterized in that implementation step is as follows:
1) disconnects being connected between neutral point and the grounded screen, gather power network neutral point open-circuit voltage U
0
2) with above-mentioned neutral ground, the neutral point short-circuit current I when gathering described neutral ground
0d
3) with step 1) and step 2) in the neutral point open-circuit voltage U that obtains
0, neutral point short-circuit current I
0dAnd the phase voltage U of power distribution network when normally moving
φBe updated to the capacitance current I that obtains in the following formula (1) in the power distribution network
C:
2. the neutral point measuring method of capacitance current of distribution network according to claim 1 is characterized in that: described neutral point is by switch element (7) ground connection, and after step 1) was finished, described switch element (7) was closed with described neutral ground.
3. capacitance current of distribution network neutral point measurement mechanism, it is characterized in that: it comprises voltage acquisition unit (1), current acquisition unit (2), processing unit (4) and switch element (7), described voltage acquisition unit (1) links to each other with the neutral point of power distribution network, and described voltage acquisition unit (1) is used to gather neutral point open-circuit voltage U
0, described current acquisition unit (2) links to each other with the neutral point of power distribution network by switch element (7), and described switch element (7) is used to control described neutral ground, the neutral point short-circuit current I of described current acquisition unit (2) when being used to gather neutral ground
0dDescribed processing unit (4) is connected with current acquisition unit (2) with described voltage acquisition unit (1) respectively, and described processing unit (4) is used for the neutral point open-circuit voltage U according to input
0, neutral point short-circuit current I
0dPhase voltage U when normally moving with power distribution network
φCalculate the capacitance current I in the power distribution network
C
4. the neutral point measurement mechanism of capacitance current of distribution network according to claim 3, it is characterized in that: described voltage acquisition unit (1) is made of voltage transformer (VT) (11) and alternating voltage-DC voltage converting unit (12), described voltage transformer (VT) (11) one sides are connected with described neutral point, opposite side is connected with alternating voltage-DC voltage converting unit (12), and described alternating voltage-DC voltage converting unit (12) exports processing unit (4) to after being used for the ac voltage signal that described voltage transformer (VT) (11) is gathered is converted to d. c. voltage signal; Described current acquisition unit (2) is made of current transformer (21) and alternating current-DC voltage converting unit (22), described current transformer (21) one ends are connected with switch element (7), the other end links to each other with alternating current-DC voltage converting unit (22), and described alternating current-DC voltage converting unit (22) exports processing unit (4) to after being used for the current signal that current transformer (21) is gathered is converted to d. c. voltage signal.
5. the neutral point measurement mechanism of capacitance current of distribution network according to claim 3, it is characterized in that: described switch element (7) is made up of thyristor unit (71) and thyristor trigger element (72), the input end of described thyristor trigger element (72) is connected with processing unit (4), the output terminal of thyristor trigger element (72) links to each other with the control end of thyristor unit (71), and the working end of thyristor unit (71) is connected between current acquisition unit (2) and the described neutral point.
6. the neutral point measurement mechanism of capacitance current of distribution network according to claim 5, it is characterized in that: described thyristor unit (71) is in series by the thyristor groups more than two groups (711), and described thyristor groups (711) is made up of the thyristor of two reverse parallel connections.
7. the neutral point measurement mechanism of capacitance current of distribution network according to claim 6, it is characterized in that: described thyristor groups (711) is parallel with capacitance resistance equalizer circuit (712), and described capacitance resistance equalizer circuit (712) is formed by resistance and capacitances in series.
8. according to the neutral point measurement mechanism of claim 3,4 or 5 described capacitance current of distribution network, it is characterized in that: described processing unit (4) links to each other with the display unit that is used to show result of calculation (6), and described processing unit (4) links to each other with the input block that is used for control switch unit (7) (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910044606A CN101696983A (en) | 2009-10-23 | 2009-10-23 | Method and device for measuring neutral point of capacitance current of distribution network |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910044606A CN101696983A (en) | 2009-10-23 | 2009-10-23 | Method and device for measuring neutral point of capacitance current of distribution network |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279344A (en) * | 2010-06-11 | 2011-12-14 | 李景禄 | Intelligent state sensor for distribution line |
| CN102279307A (en) * | 2011-07-13 | 2011-12-14 | 李景禄 | Power distribution network intelligent type multifunctional capacitive current tester |
| CN105738677A (en) * | 2014-12-07 | 2016-07-06 | 中国石油化工股份有限公司 | Power network ground capacitance current detection method |
| CN106324314A (en) * | 2016-10-25 | 2017-01-11 | 云南电网有限责任公司电力科学研究院 | Capacitive current testing device and method for isolated neutral system |
-
2009
- 2009-10-23 CN CN200910044606A patent/CN101696983A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279344A (en) * | 2010-06-11 | 2011-12-14 | 李景禄 | Intelligent state sensor for distribution line |
| CN102279307A (en) * | 2011-07-13 | 2011-12-14 | 李景禄 | Power distribution network intelligent type multifunctional capacitive current tester |
| CN105738677A (en) * | 2014-12-07 | 2016-07-06 | 中国石油化工股份有限公司 | Power network ground capacitance current detection method |
| CN105738677B (en) * | 2014-12-07 | 2018-12-21 | 中国石油化工股份有限公司 | A kind of power network capacitive earth current detection method |
| CN106324314A (en) * | 2016-10-25 | 2017-01-11 | 云南电网有限责任公司电力科学研究院 | Capacitive current testing device and method for isolated neutral system |
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Application publication date: 20100421 |