CN101021556A - Distribution network earth insulation parameter measuring and controlling method - Google Patents
Distribution network earth insulation parameter measuring and controlling method Download PDFInfo
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Abstract
This invention discloses a measuring and controlling method of the direct earth insulating parameter of the distribution network. It has such steps as setting a high inductive-value reactor at the neutral point of the distribution network and a capacity-adjusting ground fault neutralizer injecting the frequency-changing current signal to the distribution network via the reactor, real-time measuring the back current signal and computing the direct earth capacitance, resistance and damping ratio of the distribution network. It detects the single-phase ground fault according to the displacement voltage and the damping ratio and instantly shuts the switch of ground fault neutralizer when the single-phase ground fault occurs and inputting proper ground fault neutralizer, compensating the network capacitance current and accelerating the extinguishing of the fault voltaic arc. This measuring and controlling method has high measuring accuracy and good real time and specially being appropriate to the single-phase loading distribution network. It thoroughly settles the neutral-point displacement voltage of the high-symmetry distribution network, fault arc blowout and the on-line puzzle of the targeted insulating parameter which is good to improve the indices of the reliability of the distribution network.
Description
Technical field
The present invention relates to a kind of measurement and control method of power distribution network insulation against ground parameter, the power distribution network that is specially adapted to have single-phase load.
Background technology
Described power distribution network insulation against ground parameter comprises ground capacitance, resistance to earth and the ratio of damping of power distribution network.Power distribution network insulation against ground parameter directly influences one-phase earthing failure in electric distribution network aftercurrent size and fault electric arc capacity for quenching.Existing 6～35kV the power distribution network of China generally adopts the neutral by arc extinction coil grounding mode, sub-load adopts single phase power supply, as the city street lamp load, causes power distribution network three-phase degree of asymmetry to increase, produce higher displacement voltage, even surpass the allowed band of Operation of Electric Systems rules.Increase the power distribution network ratio of damping or increase the method that arc suppression coil takes off humorous degree absolute value for reducing neutral point displacement voltage, adopting.But increase power distribution network ratio of damping or increase arc suppression coil take off the earth fault arc extinction ability that the method for humorous degree absolute value has reduced power distribution network.Therefore the neutral by arc extinction coil grounding power distribution network that degree of asymmetry is big both at home and abroad is difficult to satisfy simultaneously the requirement of Operation of Electric Systems rules to neutral point displacement voltage and earth fault blow-out.Power distribution network insulation against ground parameter directly influences power network neutral point displacement voltage and earth fault arc extinction ability.Still do not report both at home and abroad at present about the method for power distribution network insulation against ground Parameter Measuring and optimum control.
Therefore be necessary power distribution network insulation against ground parameter is carried out on-line measurement, seek the method for optimally controlling of power distribution network insulation against ground parameter, neutral point displacement voltage can maintain the scope that rules allow when power distribution network was normally moved, and can effectively extinguish fault electric arc during earth fault.
Summary of the invention
For solving the technical barrier that the big power distribution network of degree of asymmetry satisfies neutral point displacement voltage and earth fault blow-out simultaneously, realize the on-line measurement and the optimum control of power distribution network insulation against ground parameter, the invention provides the method for a kind of accurate power distribution network insulation against ground parameter measurement and control, have and measure and control accuracy height, characteristics that real-time is good.
The technical scheme that the present invention solves the problems of the technologies described above may further comprise the steps:
1) at power distribution network a reactor and the arc suppression coil that capacity is adjustable that inductance value is very big is installed, reactor directly links to each other with power network neutral point, arc suppression coil links to each other with power network neutral point by switch, and the arc suppression coil switch is closure when power distribution network generation singlephase earth fault only;
2) measure power distribution network insulation against ground parameter: inject the frequency conversion current signal from a second siding ring of reactor
The voltage signal that returns from another secondary coil collection of reactor
Determine the resonance angular frequency ω of power distribution network by the relation of current signal and voltage signal
0, calculate power distribution network total capacitance value over the ground by following formula:
L is the inductance value of reactor in the following formula;
And calculate power distribution network resistance to earth value R and power distribution network ratio of damping d respectively by following formula:
K is the no-load voltage ratio of the primary side and the secondary side of reactor in the following formula;
3) if the power network neutral point displacement voltage greater than displacement voltage setting valve or power distribution network ratio of damping greater than the ratio of damping setting valve, then judge power distribution network generation singlephase earth fault, rapid closing arc suppression coil switch,
The capacity that drops into arc suppression coil is:
U in the following formula
Be the power distribution network phase voltage, ω is the power distribution network industrial frequency angular frequency;
4) if the power network neutral point displacement voltage less than displacement voltage setting valve and power distribution network ratio of damping less than the ratio of damping setting valve, judge that then earth fault eliminates, disconnect the arc suppression coil switch rapidly.
Above-mentioned steps 1) the reactance value size of reactor is 8～20 times of power distribution network capacitance to earth in.
Above-mentioned steps 2) frequency range of injecting the frequency conversion current signal in is 5Hz～45Hz, and the size of current signal is 0.1A～2A.
Above-mentioned steps 3) span of power network neutral point displacement voltage setting valve is 10%～50% specified phase voltage in, and ratio of damping setting valve span is 0.05～0.20.
Technique effect of the present invention is: the present invention installs a reactor and the arc suppression coil that capacity is adjustable that inductance value is very big at the neutral point place of power distribution network, reactor drops into power distribution network for a long time, during normal the operation, inject the frequency conversion current signal through reactor to power distribution network, seek the resonance frequency of power distribution network, calculate ground capacitance, resistance to earth and the ratio of damping of power distribution network; And, when earth fault takes place, drop into arc suppression coil by displacement voltage and ratio of damping size judgement earth fault, and promote that effectively fault electric arc extinguishes, when earth fault was eliminated, arc suppression coil withdrawed from power distribution network.The reactance value of reactor is 8～20 times of power distribution network capacitance to earth among the present invention, and resonance frequency effectively reduced the displacement voltage problem of the big power distribution network of degree of asymmetry away from power frequency 50Hz when power distribution network was normally moved; During power distribution network generation singlephase earth fault, the arc suppression coil of neutral point input compensates the power distribution network ground capacitance entirely, reduces residue current of ground fault in electrical, effectively promotes the earth fault arc extinction; This measurement and control method are specially adapted to have the power distribution network of single-phase load, have thoroughly solved the technical barrier of big power network neutral point displacement voltage, fault blow-out and insulation against ground Parameter Measuring of degree of asymmetry.
Below in conjunction with accompanying drawing the present invention is made and to further specify:
Description of drawings
Fig. 1 is a wiring diagram of the present invention.
Fig. 2 is measuring principle figure of the present invention.
Fig. 3 is an equivalent schematic diagram of the present invention.
Embodiment
Referring to Fig. 1, Fig. 1 implements wiring diagram of the present invention for utilizing grounding transformer 1, reactor 4, measurement and control instrument 5.The A that grounding transformer 1 gets access to grid, B, C three-phase bus, the neutral point 0 of grounding transformer 1 links to each other with arc suppression coil 3 through switch 2, another termination the earth of arc suppression coil 3.Reactor 4 high-pressure sides are serially connected between the neutral point O and the earth of grounding transformer 1; Reactor 4 low-pressure sides have four terminals, and two current signals that connect measurement and control instrument 5 are sent terminal, and two other voltage signal that connects measurement and control instrument 5 returns terminal.When system normally moves, switch 2 disconnects, and arc suppression coil 3 does not drop into power distribution network, and the reactance value of reactor is 8～20 times of power distribution network capacitance to earth, resonance frequency effectively reduced the big power distribution network displacement voltage of degree of asymmetry away from power frequency 50Hz when power distribution network was normally moved.
Measuring principle of the present invention as shown in Figure 2.When electrical network normally moved, measurement and control instrument 5 injected the frequency conversion current signal from a second siding ring of reactor 4 to power distribution network, the voltage signal that returns from another second siding ring collection; Determine the resonance angular frequency ω of power distribution network by the relation of current signal and voltage signal
0Its equivalent schematic diagram can get according to resonance principle as shown in Figure 3:
L is the inductance value of reactor in the following formula;
When being in resonant condition, power distribution network injects resonance angular frequency ω to the reactor secondary coil
0Current signal
And the voltage signal that returns from the secondary side collection of reactor
Utilize following formula to calculate the value of power distribution network resistance to earth value and power distribution network ratio of damping:
K is the no-load voltage ratio of the primary side and the secondary side of reactor in the following formula, C
∑Be power distribution network total capacitance value over the ground.
Embodiment 1 is an insulation against ground parameter of measuring a 10kV analog ligand electrical network, and wiring as shown in Figure 2.Ground capacitance parameter measurements in the power distribution network insulation against ground parameter is as shown in table 1, and the maximum relative error that ground capacitance is measured is 1.59%; The resistance to earth in the power distribution network insulation against ground parameter and the measurement result of ratio of damping are as shown in table 2, and the maximum relative error that resistance to earth is measured is 3.5%; The maximum relative error that ratio of damping is measured is 3.5%.
Embodiment 2 measures and controls an actual power distribution network.Power distribution network insulation against ground parameter investigating instrument based on this power distribution network insulation against ground parameter measurement and control method has the big 10kV substation operation of three-phase degree of asymmetry that single-phase street lamp is loaded at one, the neutral point displacement voltage setting valve that measurement and control instrument is set is 500V, and the ratio of damping setting valve is 0.20.Power distribution network is installed insulation against ground parameter investigating instrument run duration, singlephase earth fault has taken place 3 times, the field failure record data are as shown in table 3, when earth fault takes place, measurement and control instrument is detection of ground faults reliably all, and closed arc suppression coil switch drops into the arc suppression coil of suitable capacity, full compensation power distribution network capacitive earth current extinguishes earth fault electric arc; Behind the failure cleaning, measurement and control instrument is the elimination of detection of ground faults automatically all, automatic cutout arc suppression coil switch, and the control power distribution network operates in serious under-compensation state, with the restriction neutral point displacement voltage, recovers power distribution network and normally moves.Industry spot operating experience shows: power distribution network insulation against ground parameter investigating instrument has thoroughly solved the technical barrier of big power network neutral point displacement voltage, earth fault blow-out and insulation against ground Parameter Measuring of degree of asymmetry, can effectively safeguard the power distribution network safe and reliable operation.
Table 1
| Actual external capacitor value (μ F) | 81.99 | 69.62 | 60.68 | 49.93 | 41.63 |
| Measure capacitance (μ F) | 81.21 | 68.51 | 60.13 | 49.47 | 41.24 |
| Measure capacitance relative error (%) | 0.95 | 1.59 | 0.90 | 0.92 | 0.93 |
Table 2
| Actual outer meeting resistance value (k Ω) | 300 | 80 | 15 | 5 | 2 |
| Measured resistance value (k Ω) | 311 | 82.9 | 15.2 | 5.1 | 2.03 |
| Measured resistance value relative error (%) | 3.3 | 3.5 | 1.4 | 2.2 | 1.9 |
| Actual ratio of damping | 0.033 | 0.124 | 0.663 | 1.99 | 4.98 |
| Measure ratio of damping | 0.032 | 0.120 | 0.654 | 1.95 | 4.89 |
| Measure ratio of damping relative error (%) | 3.3 | 3.5 | 1.4 | 2.2 | 1.9 |
Table 3
Claims (4)
1, a kind of power distribution network insulation against ground parameter measurement and control method have following steps:
1) at power distribution network a reactor and the arc suppression coil that capacity is adjustable that inductance value is very big is installed, reactor directly links to each other with power network neutral point, arc suppression coil links to each other with power network neutral point by switch, and the arc suppression coil switch is closure when power distribution network generation singlephase earth fault only;
2) measure power distribution network insulation against ground parameter: inject the frequency conversion current signal from a second siding ring of reactor
The voltage signal that returns from another secondary coil collection of reactor
Determine the resonance angular frequency ω of power distribution network by the relation of current signal and voltage signal
0, calculate power distribution network total capacitance value over the ground by following formula:
L is the inductance value of reactor in the following formula;
And calculate power distribution network resistance to earth value R and power distribution network ratio of damping d respectively by following formula:
K is the no-load voltage ratio of the primary side and the secondary side of reactor in the following formula;
3) if the power network neutral point displacement voltage greater than displacement voltage setting valve or power distribution network ratio of damping greater than the ratio of damping setting valve, then judge power distribution network generation singlephase earth fault, rapid closing arc suppression coil switch, the capacity that drops into arc suppression coil is:
U in the following formula
Be the power distribution network phase voltage, ω is the power distribution network industrial frequency angular frequency;
4) if the power network neutral point displacement voltage less than displacement voltage setting valve and power distribution network ratio of damping less than the ratio of damping setting valve, judge that then earth fault eliminates, disconnect the arc suppression coil switch rapidly.
2, power distribution network insulation against ground parameter measurement according to claim 1 and control method is characterized in that: the reactance value of reactor size is 8～20 times of the power distribution network capacitance to earth in the described step 1).
3, power distribution network insulation against ground parameter measurement according to claim 1 and control method is characterized in that: the frequency range of injecting the frequency conversion current signal described step 2) is 5Hz～45Hz, and the size of current signal is 0.1A～2A.
4, power distribution network insulation against ground parameter measurement according to claim 1 and control method, it is characterized in that: the span of power network neutral point displacement voltage setting valve is 10%～50% specified phase voltage in the described step 3), and ratio of damping setting valve span is 0.05～0.20.
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| CNB2007100345558A CN100507583C (en) | 2007-03-16 | 2007-03-16 | Distribution network earth insulation parameter measuring and controlling method |
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| CN102288875A (en) * | 2011-07-12 | 2011-12-21 | 国网电力科学研究院 | Low-current grounding wire-selecting method |
| CN102540016A (en) * | 2012-01-16 | 2012-07-04 | 北京科力恒久电力技术股份有限公司 | Power distribution line single-phase earth fault positioning and isolating method |
| CN102593808A (en) * | 2012-03-23 | 2012-07-18 | 上海市电力公司 | System for grounding neutral point by using combination of reactor and resistors |
| CN102798760A (en) * | 2012-08-16 | 2012-11-28 | 阳光电源股份有限公司 | Method and circuit fir detecting ground insulation impedance of photovoltaic array |
| CN102818938A (en) * | 2012-07-29 | 2012-12-12 | 刘宝稳 | Method for carrying out tracking measurement and control on ground distribution parameters of power grid by parameter shifting and phase changing method |
| CN102981061A (en) * | 2012-11-16 | 2013-03-20 | 广东中钰科技有限公司 | Direct earth capacitance gauge in converting station power distribution system |
| CN103336177A (en) * | 2013-06-07 | 2013-10-02 | 国家电网公司 | Testing method for ground resistance and ground capacitance of grounding network |
| CN104155525A (en) * | 2014-05-14 | 2014-11-19 | 国家电网公司 | Multi-frequency scanning type tower grounding resistance measurement apparatus and method |
| CN105652097A (en) * | 2015-12-24 | 2016-06-08 | 阳光电源股份有限公司 | Photovoltaic grid-connected power generation system and grid-side insulation resistance detecting device thereof |
| 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 |
| CN109245081A (en) * | 2018-10-09 | 2019-01-18 | 国网河南省电力公司洛阳供电公司 | A kind of residual voltage suppressing method based on neutral ground impedance optimal control |
| CN110048392A (en) * | 2019-03-13 | 2019-07-23 | 国网浙江省电力有限公司电力科学研究院 | A kind of simulation system and method for configuration type power distribution network dynamic model mixing earthing mode |
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| CN111103501A (en) * | 2018-10-09 | 2020-05-05 | 长沙理工大学 | Method and system for measuring ground insulation parameters of ungrounded neutral point power distribution network |
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| CN102288875A (en) * | 2011-07-12 | 2011-12-21 | 国网电力科学研究院 | Low-current grounding wire-selecting method |
| CN102540016A (en) * | 2012-01-16 | 2012-07-04 | 北京科力恒久电力技术股份有限公司 | Power distribution line single-phase earth fault positioning and isolating method |
| CN102593808A (en) * | 2012-03-23 | 2012-07-18 | 上海市电力公司 | System for grounding neutral point by using combination of reactor and resistors |
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