CN105207184A - Zero-sequence directional element for neutral point via-resistance grounding system - Google Patents
Zero-sequence directional element for neutral point via-resistance grounding system Download PDFInfo
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- CN105207184A CN105207184A CN201510657255.XA CN201510657255A CN105207184A CN 105207184 A CN105207184 A CN 105207184A CN 201510657255 A CN201510657255 A CN 201510657255A CN 105207184 A CN105207184 A CN 105207184A
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Abstract
The invention discloses a kind of zero-sequence direction components for Neutral Grounding through Resistance in Electrical system, it is characterized in that: the maximum fineness angle of zero-sequence direction component
It is set as 180 °, the operating criterion of zero-sequence direction component is
Ground resistance RN ≥11X1N/3,Wherein RN is the grounding resistance of single neutral point,N is the number of system earth resistance,X1 is the maximum equivalent forward-sequence reactance of system; Also,The reference positive direction of residual voltage is that bus is directed toward the earth,The reference positive direction of zero-sequence current is to be directed toward protected route from the bus of protection installation place; The present invention passes through the maximum fineness angle and operating criterion of modification zero-sequence direction component,System neutral is eliminated by after being directly grounded and being changed to resistance grounded,Malfunction area and tripping area existing for zero-sequence direction component in former protective device,Ensure that zero sequence direction current protection correctly judges fault point orientation,Guarantee is provided for the safe operation of power distribution network and the raising of power supply quality.
Description
Technical field
The present invention relates to 110kV Neutral Grounding through Resistance in Electrical power distribution network, especially a kind of Neutral Grounding through Resistance in Electrical system for many sides Power supply, and the zero-sequence direction component that zero sequence direction current protection correct failure judgement point orientation can be guaranteed.
Background technology
China 110kV power distribution network generally adopts the mode of neutral-point solid ground to run, and during this system single phase ground fault, load side three-phase voltage occurs obviously asymmetric, and voltage dip is serious.In recent years along with a large amount of uses of the sensitiveness loads such as frequency control equipment and computer-controlled various automatic assembly lines, voltage dip has become an important power quality problem, the voltage dip in several cycle all will have influence on the normal operation of some business electrical equipment, product quality is caused to decline, production line is disorderly or interrupt, and the frequent voltage dip occurred causes huge economic loss to user.110kV system adopts neutral-point solid ground mode cannot meet the power reguirements of sensitiveness load.
Theoretical research and actual motion are verified, adopt 110kV system power supply side neutral point through the mode of suitable grounding through resistance, effectively can limit voltage dip during single phase ground fault, significantly improve the power supply quality of system.But; because the neutral resistance value selected according to this requirement is generally much larger than the zero sequence reactance value of system; cause zero sequence impedance angle that very large change occurs; the operating characteristics of zero-sequence direction component and maximum fineness angle is caused to be different from solidly earthed neutral system; if the zero-sequence direction component in former protective device is directly used in Neutral Grounding through Resistance in Electrical system; then may there is malfunction or the tripping of zero sequence direction current protection, thus threaten the safe operation of distribution system.
Summary of the invention
Object of the present invention will solve in current 110kV power distribution network exactly; after neutral-point solid ground mode is changed into resistance grounded mode; when existing zero-sequence direction component is directly used in Neutral Grounding through Resistance in Electrical system; there will be malfunction district and tripping district; thus cause zero sequence direction current protection to occur malfunction or tripping; threaten the safe operation problem of power distribution network; there is provided a kind of for Neutral Grounding through Resistance in Electrical system for this reason, the zero-sequence direction component in zero sequence direction current protection correct failure judgement point orientation can be guaranteed.
Concrete scheme of the present invention is: in the 110kV Neutral Grounding through Resistance in Electrical system that side power supply more than (two or more power supply) is powered, zero-sequence direction component is all equipped with in 110kV circuit both sides, when utilizing route protection positive direction or earth fault occur in the other direction, flow through the zero-sequence current of line protective devices and the different of residual voltage phase difference, distinguish the position of fault point; During protection forward fault, zero-sequence direction component action, coordinates the trip(ping) circuit of connecting circuit breaker with zero-sequence current component and time component; During reverse fault, zero-sequence direction component is failure to actuate, thus the trip(ping) circuit of locking circuit breaker.The feature of 110kV Neutral Grounding through Resistance in Electrical system zero-sequence direction component is: its maximum fineness angle
be set as 180 °, operating criterion is
wherein the reference positive direction of residual voltage is that bus points to the earth, and the reference positive direction of zero-sequence current is point to protected circuit from the bus of protection installation place; The selection of neutral resistance must satisfy condition: R
n>=11X
1n/3 (wherein R
nfor the grounding resistance of single neutral point, N is the number of system earth resistance, X
1maximum equivalent positive sequence reactance for system), the neutral resistance value of selection like this, can make system under various operational mode, when there is modal single phase ground fault in 110kV side, the three-phase voltage of load side falls and is all no more than-10% of rated voltage, meet the requirement of system voltage fluctuation range, significantly improve the quality of power supply of power distribution network.
Meaning of the present invention is: in the transformation of 110kV power distribution network, after changing neutral grounding mode into resistance grounded, line protective devices and external cabling thereof that circuit used originally need not be changed, only need by the maximum fineness angle of software modification zero-sequence direction component and operating criterion, just can change the operating characteristics of zero-sequence direction component, guarantee zero sequence direction current protection correct failure judgement point orientation, eliminate zero-sequence direction component in former line protective devices for the malfunction district that occurs during Neutral Grounding through Resistance in Electrical system and tripping district, ensure that the correctness of zero-sequence current protection action, thus improve the reliability of power distribution network safe operation, for China 110kV distribution network transform adopts Neutral Grounding through Resistance in Electrical mode to improve power supply quality, save the investment changing line protective devices, and provide operability.
Accompanying drawing explanation
Fig. 1 is the typical primary system figure that is suitable for of the present invention and the size of residual voltage and the schematic diagram of distribution;
Fig. 2 is the schematic diagram (having marked the reference positive direction of line protective devices installation place zero-sequence current, voltage in the drawings) of the zero sequence equivalent circuit of Fig. 1;
Fig. 3 is transmission line f in the present invention
1when there is single phase ground fault in (protection positive direction) place, the phasor schematic diagram of residual voltage and zero-sequence current;
Fig. 4 is the operating characteristics schematic diagram of the zero-sequence direction component of Neutral Grounding through Resistance in Electrical system in the present invention;
Fig. 5 is current in the 110kV power distribution network of neutral-point solid ground, the operating characteristics schematic diagram of zero-sequence direction component;
Fig. 6 is the zero-sequence direction component of existing protective device when being directly used in Neutral Grounding through Resistance in Electrical system, the distribution schematic diagram in the malfunction district that zero-sequence direction component occurs and tripping district.
Embodiment
The present embodiment is described for the operating characteristics of 110kV Neutral Grounding through Resistance in Electrical system to zero-sequence direction component of bilateral source.
See Fig. 1, system main power source and step-down substation, transmission line, primary substation and local power supply G are the present invention includes, the step-down transformer T of step-down substation
1one time winding is connected with 220kV system main power source, the step-up transformer T of primary substation
2one time winding is connected with local power supply G, and the neutral point of step-down, step-up transformer secondary winding is respectively through earth resistance R
nground connection; Described transmission line is connected between 110kV ac bus W1, W2 of Liang Ge transformer station, particularly: be configured with No. one, No. two line protective devices respectively at the two ends of transmission line, in FIG, No. one, No. two line protective devices are respectively with the box indicating with label 1 mod sum label 2; And the maximum fineness angle of zero-sequence direction component in No. one, No. two line protective devices
all be set as 180 °, the operating criterion of zero-sequence direction component is
in Neutral Grounding through Resistance in Electrical system, the reference positive direction of residual voltage is that bus points to the earth, and the reference positive direction of zero-sequence current is point to protected circuit from the bus of protection installation place; Earth resistance R
n>=11X
1n/3 (its derivation is shown in that application number is: the patent application document of 201310678334.X), wherein R
nfor the grounding resistance of single neutral point, N is the number of system earth resistance, X
1for the maximum equivalent positive sequence reactance of system.
For the power distribution network of 110kV, when adopting Neutral Grounding through Resistance in Electrical mode, according to the constraints R eliminating and suppress single phase ground fault Voltage Drop
n>=11X
1the grounding resistance that N/3 selects generally can much larger than the zero sequence reactance of system, thus great changes will take place to make the ratio of the zero sequence reactance of system and zero sequence resistance parameter, causes the residual voltage of system, the size of electric current and distribution and the phase difference between them to be different from solidly earthed neutral system.
Be further described below in conjunction with the zero-sequence direction component operating characteristics of embodiment to the 110kV Neutral Grounding through Resistance in Electrical system of bilateral source.
(1) size of residual voltage electric current and distribution and phase difference.
When 110kV Neutral Grounding through Resistance in Electrical system generation ground short circuit, have on the bus of direct electrical link and neutral point with fault point and all can occur residual voltage.As shown in Figure 1, f is worked as
1when there is metallicity single phase ground fault in point, the size of its residual voltage and distribution as shown in FIG.: the residual voltage U of fault point
f0≈ U
p(normal phase voltage), because the zero sequence impedance of General System is much smaller than the equivalent earth resistance 3R of neutral point
n, therefore residual voltage mainly drops on 110kV neutral point, i.e. neutral point voltage
the zero sequence measuring voltage of route protection installation place (No. one or No. two line protective devices)
also with the residual voltage approximately equal of fault point, it is that bus points to the earth with reference to positive direction.
When Neutral Grounding through Resistance in Electrical system generation earth fault, the residual voltage source of fault point by by the earth and neutral resistance and with the loop that there is the circuit of direct electrical link fault point, transformer forms zero-sequence current, as Fig. 1 system neutral road f
1when there is single phase ground fault in place, corresponding zero sequence equivalent circuit as shown in Figure 2:
X in figure
s.0for the equivalent zero sequence reactance of 220kV system; X
1.0, X
2.0, X
3.0for step-down transformer T
1high, medium and low voltage side winding leakage reactance; X
l1, X
l2be respectively fault point f
1to the circuit zero sequence reactance of protection installation place, two ends; X
t2for step-up transformer T
2zero sequence equivalent reactance; 3R
nfor the zero sequence equivalent resistance of transformer 110kV side neutral point.
If the positive direction of zero-sequence current is point to protected circuit, as this line-internal f from the bus of protection installation place (line protective devices)
1when single phase ground fault occurs at place, by residual voltage, the current reference positive direction of defined, the zero-sequence current flowing through the zero-sequence direction component place of line protective devices is:
Due to the neutral point equivalence grounding resistance 3R that basis prevents Voltage Drop and overvoltage from requiring to select
nmuch larger than the zero sequence equivalent reactance of circuit and transformer, so the zero sequence impedance angle of Neutral Grounding through Resistance in Electrical system
with
phase relation as shown in Figure 3: and owing to being subject to the restriction of neutral resistance, its zero-sequence current value is more much smaller than solidly earthed neutral system.
In like manner analyze No. two line protective devices installation places
with
also can draw same conclusions, that is:, in Neutral Grounding through Resistance in Electrical system, during the positive direction generation earth fault of protection, the residual voltage of protection installation place is ahead of about 180 ° of zero-sequence current, i.e. forward zero sequence impedance angle
As f in fig. 2
2when earth fault occurs at place, be reverse direction failure for line protective devices, the zero-sequence current at this moment flowing through line protective devices is:
Equally, due to 3R
nmuch larger than step-up transformer T
2with the zero sequence equivalent reactance of circuit, therefore during reverse fault, residual voltage and the zero-sequence current phase angle of protection installation place are approximately 0 °, i.e. similar same-phase.
(2) the zero-sequence direction component operating characteristics of grounded system via resistance.
Action reliably sensitive when zero-sequence direction component should ensure forward earth fault, being reliably failure to actuate during reverse earth fault, in order to reach this purpose, generally setting the zero sequence impedance angle of maximum fineness angle as forward fault of zero-sequence direction component, namely
the impact (as voltage, current transformer angle error, the impact etc. of element reactive parameter in system) of consideration system various factors, during forward fault
with
not necessarily just in time anti-phase, also not necessarily just in time homophase during reverse fault is zero-sequence direction component energy action message when ensureing forward fault, on maximum fineness angle basis ± 90 °, namely operating criterion is:
Its operating characteristics is as shown in Figure 4: wherein Left half-plane dash area is the active region of Neutral Grounding through Resistance in Electrical system zero-sequence direction component, uses D
1represent, RHP is district of being failure to actuate, and uses D
0represent.
(3) malfunction of solidly earthed neutral system zero-sequence direction component, tripping district.
In solidly earthed neutral system, the zero sequence impedance angle of 110kV line protective devices is generally set to about 75 °, and the maximum fineness angle of zero-sequence direction component is 255 ° (180 °+75 °), its operating characteristics as shown in Figure 5, Z in Fig. 5
1represent active region, Z
0represent district of being failure to actuate:
Operating criterion is:
If this zero sequence power direction element is directly used in Neutral Grounding through Resistance in Electrical system, then during forward fault,
may tripping be there is in scope, during reverse fault,
may malfunction be there is in scope, its tripping district, malfunction district as shown in shadow region in Fig. 6, wherein tripping district W
0represent, malfunction district W
1represent.Thus, to adjust the maximum fineness angle of zero sequence power direction element in current Neutral Grounding through Resistance in Electrical system, thus guarantee the safe operation of power distribution network.
In sum; when transforming 110kV solidly earthed neutral system as Neutral Grounding through Resistance in Electrical system; in order to ensure the correctness of zero-sequence direction component action, the maximum fineness angle of the zero-sequence direction component of former line protective devices should be adjusted to 180 °, operating criterion changes into
to ensure the correctness of zero sequence direction current protection action, guarantee the safe and reliable operation of system.
It should be noted that, the principle of above-described Neutral Grounding through Resistance in Electrical system zero-sequence direction component is only discuss for the system of bilateral source, real system due to any multiple power supply always becomes the equivalent network of a Double-End Source by the method abbreviation of network transformation, so the selection of the maximum fineness angle of zero-sequence direction component and operating criterion also can apply to the supply network of the Neutral Grounding through Resistance in Electrical system of many sides Power supply in the present invention.
Claims (1)
1. for a zero-sequence direction component for Neutral Grounding through Resistance in Electrical system, it is characterized in that: the maximum fineness angle of zero-sequence direction component
be set as 180 °, the operating criterion of zero-sequence direction component is
, zero-sequence direction component corresponds to the grounding resistance of Neutral Grounding through Resistance in Electrical system according to constraints R
n>=11X
1n/3 selects, wherein R
nfor the grounding resistance of single neutral point, N is the number of system earth resistance, X
1for the maximum equivalent positive sequence reactance of system; And; zero-sequence direction component corresponds to the protection residual voltage of installation place and the reference direction of zero-sequence current is: the reference positive direction of residual voltage is that bus points to the earth, and the reference positive direction of zero-sequence current is point to protected circuit from the bus of protection installation place.
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| CN201510657255.XA CN105207184B (en) | 2015-10-12 | 2015-10-12 | A kind of zero-sequence direction component for Neutral Grounding through Resistance in Electrical system |
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| CN201510657255.XA CN105207184B (en) | 2015-10-12 | 2015-10-12 | A kind of zero-sequence direction component for Neutral Grounding through Resistance in Electrical system |
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Cited By (4)
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| CN105527543A (en) * | 2016-01-26 | 2016-04-27 | 国家电网公司 | High voltage line longitudinal zero sequence direction discrimination method and device |
| CN107192919A (en) * | 2017-06-20 | 2017-09-22 | 国网江苏省电力公司无锡供电公司 | A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices and method |
| CN107204609A (en) * | 2017-06-20 | 2017-09-26 | 国网江苏省电力公司无锡供电公司 | The power distribution network busbar protective device and method of a kind of earthing mode self-identifying |
| CN107317312A (en) * | 2017-06-20 | 2017-11-03 | 国网江苏省电力公司无锡供电公司 | The distribution network line differential protection and method of a kind of earthing mode self-identifying |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105527543A (en) * | 2016-01-26 | 2016-04-27 | 国家电网公司 | High voltage line longitudinal zero sequence direction discrimination method and device |
| CN105527543B (en) * | 2016-01-26 | 2018-06-01 | 国家电网公司 | A kind of high-tension line indulges connection zero sequence direction method of discrimination and device |
| CN107192919A (en) * | 2017-06-20 | 2017-09-22 | 国网江苏省电力公司无锡供电公司 | A kind of power distribution network feedback of earthing mode self-identifying supplies line protective devices and method |
| CN107204609A (en) * | 2017-06-20 | 2017-09-26 | 国网江苏省电力公司无锡供电公司 | The power distribution network busbar protective device and method of a kind of earthing mode self-identifying |
| CN107317312A (en) * | 2017-06-20 | 2017-11-03 | 国网江苏省电力公司无锡供电公司 | The distribution network line differential protection and method of a kind of earthing mode self-identifying |
| CN107317312B (en) * | 2017-06-20 | 2019-07-16 | 国网江苏省电力公司无锡供电公司 | A kind of the distribution network line differential protection and method of earthing mode self-identifying |
| CN107204609B (en) * | 2017-06-20 | 2019-07-16 | 国网江苏省电力公司无锡供电公司 | A kind of the power distribution network busbar protective device and method of earthing mode self-identifying |
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| CN105207184B (en) | 2016-11-30 |
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