CN101017974A - Single phase grounding failure positioning method and device of neutral point non direct grounding power grid - Google Patents
Single phase grounding failure positioning method and device of neutral point non direct grounding power grid Download PDFInfo
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Abstract
The disclosed neutral-point indirect-grounding power network single-phase grounding fault location method comprises: all monitor control terminals are assembled on the distribution line switch or raing main unit, simultaneous collects and records the instant line zero-sequence current message before and after the fault to send to the host for analysis and find out the fault segment to isolation. This invention can fast diagnose fault segment to ensure normal power supplying.
Description
Technical field
The present invention relates to the quick location of a kind of electrical network single-phase earthing or short trouble and restore electricity, the method and the device of particularly a kind of neutral nondirect earthing network single-phase earthing or phase fault location belong to the power supply technique field.
Background technology
66 kilovolts in China and following electrical network (also claiming distribution system) operational mode generally adopts the operational mode (being isolated neutral or neutral by arc extinction coil grounding operational mode) of neutral point indirect earthing.In the neutral point indirect earthing operational system, when single phase ground fault took place, because the characteristics such as ground connection instability that fault current is little, arc light causes, single phase ground fault was difficult to thorough solution.How determining fast that line fault position and rapid isolated fault recover the power supply to the user early, is the problem that people generally are concerned about.But up to the present, people have have just researched and solved under the situation of transformer station's multichannel outlet, how to select the problem that circuit is the fault circuit, and after selecting faulty line, how to find earth fault as early as possible, and then the power supply of the fast non-fault section of quick-recovery, but continue to use more original artificial line walking way always.Not only want expensive manpower therebetween, cause power failure also will for the electricity consumer of whole piece circuit, several hrs at least, tens hours at most, even the longer time, influence the regular supply of electric power.
China scientific research personnel has also carried out some researchs on the distribution line failure determination methods at present, as: on September 6th, 2000 is disclosed, application number provides a kind of " earthing protection method for small current earthing system " for 0114452.9 application for a patent for invention, and it comprises the steps: 1. residual voltage, the negative-sequence current of monitoring system; 2. when residual voltage when adjusting voltage, ground connection or disconnection fault take place in decision-making system; 3. calculate negative-sequence current variation delta I2; 4. when certain circuit | Δ I2|＞| Is|, and | Δ I2|＞setting value, judge this line fault.Above-mentioned patent application and the existing one-phase ground protection that drops into practical application only can be grounded the route selection function of fault; generally need to gather and compare the information about power of each outlet; the circuit of single phase ground fault could be determined, the demand for development that the feeder automation fault section is discerned isolation automatically can not be adapted to.
Summary of the invention
Purpose of the present invention is exactly the method and the device of a kind of neutral nondirect earthing network generation single-phase earthing that proposes at the deficiencies in the prior art or phase fault location, utilize the present invention can determine the fault section of circuit, also rapid isolated fault point fast, to guarantee power supply to non-fault section.
The objective of the invention is to be achieved through the following technical solutions:
The neutral nondirect earthing network single-phase earth fault positioning device is made up of main frame, host analysis software, Monitoring and Controlling terminal, instrument transformer monitoring terminal etc.Each Monitoring and Controlling terminal is installed on distribution line on-pole switch or ring main unit place, and each Monitoring and Controlling terminal is synchronous by gps satellite time service synchronised clock inhibit signal acquisition time; Be to carry out data passes or assign control command between main frame and Monitoring and Controlling terminal, the instrument transformer monitoring terminal with GPRS/GSM wireless communication mode or wired (optical fiber) communication modes.
The present invention in order to the principle of judging neutral point indirect earthing distribution system single phase earthing fault section is:
1. when the earth-free distribution system generation of neutral point single phase ground fault, the substation has jurisdiction over all distribution line backbones and branch line all has zero-sequence current to pass through.The stable state of distribution line backbone and branch line, transient zero-sequence current satisfy following condition:
1. the stable state that faulty line passed through, transient zero-sequence current are all non-fault line electric current sums, and direction is to bus by line flows;
2. non-fault line (the non-fault branch line that comprises faulty line) stable state, transient zero-sequence current are the capacitance current of circuit self, and direction is for to flow to circuit by bus;
3. the stable state that the fault branch line passed through of faulty line, transient zero-sequence current are the non-fault branch line capacitance current sum of all non-fault lines and faulty line, and direction is to bus by line flows;
4. if the zero-sequence current direction of all circuits all for by bus inflow circuit then single phase ground fault occur in substation bus bar.
2. under the distribution system overcompensation running status of neutral by arc extinction coil grounding, when single phase ground fault took place, stable status zero-sequence current no longer satisfied above-mentioned condition, but the quintuple harmonics electric current still satisfies above-mentioned condition;
3. under the distribution system overcompensation running status of neutral by arc extinction coil grounding, during system's generation single phase ground fault, as reactance or the impedance parameter that changes arc suppression coil in short-term, then: a certain amount of change all can take place in the zero-sequence current of faulty line and non-fault line thereupon.Wherein, the variable quantity of faulty line zero-sequence current is maximum.
When the earth-free distribution system generation of neutral point single phase ground fault, neutral nondirect earthing network single-phase earth fault positioning device implementation method is as follows:
At first, substation bus bar voltage transformer monitoring terminal monitors substation bus bar voltage transformer open delta output voltage and reaches the numerical value of adjusting in advance, single phase ground fault has taken place with GPRS/GSM communication modes notice main frame distribution system in the bus-bar potential transformer monitoring terminal, by all Monitoring and Controlling terminal interceptings of host notification and storage failure the fault zero-sequence current Wave data of moment front and back takes place then, and this Wave data is sent to main frame by the GPRS/GSM wireless communication mode, main frame is at first analyzed and is respectively gone out the measured transient state of wiretap Monitoring and Controlling terminal in the comparison transformer station, the amplitude of stable status zero-sequence current and phase place, therefrom select the zero-sequence current circuit (not considering when the zero-sequence current amplitude is too small) of 4 amplitude maximums, carry out the comparison (lateral comparison) of zero-sequence current amplitude and phase place, according to the failure criterion of above-mentioned single-phase earthing, determine that single phase ground fault has taken place which bar circuit.When having determined it is after single phase ground fault has taken place certain bar circuit, the Wave data that all Monitoring and Controlling terminals of installing on this circuit are passed back is analyzed comparison (longitudinal comparison again, but do not comprise other non-fault line switches this moment), the measured transient state of all Monitoring and Controlling terminals of this circuit of failure criterion analysis and judgement with single-phase earthing, the amplitude of stable status zero-sequence current and phase place, last failure criterion according to above-mentioned single-phase earthing, drawing zero-sequence current is the path that earth point fault zero-sequence current is circulated by line flows to one group of switch of bus, thereby, draw the line fault section position by the host software judgement.At this moment, main frame is notified the related work personnel with fault section information with computer screen demonstration, sound and light alarm and mobile phone short messages automatically.The operator on duty can be in view of the above by the switch (also can be set to the computer control automatic disconnection) before the computer distant place control open failure section.Thereby excise, isolated the earth point fault, it is normal that bus instrument transformer open delta output voltage recovers.
When the distribution system generation single phase ground fault of neutral by arc extinction coil grounding, neutral nondirect earthing network single-phase earth fault positioning device implementation method is as follows:
At first, substation bus bar voltage transformer monitoring terminal monitors substation bus bar voltage transformer open delta output voltage and reaches the numerical value of adjusting in advance, the bus-bar potential transformer monitoring terminal is with GPRS/GSM wireless communication mode notice main frame, single phase ground fault has taken place in distribution system, meanwhile, the gear of neutral point arc suppression coil is in about 3 seconds time, automatically turn down a retaining or heighten a retaining by certain gear before the ground connection, get back to the preceding gear of former ground connection then again, at this moment, by the zero-sequence current Wave data before and after the gear variation of all Monitoring and Controlling terminal interceptings of host notification and storage failure generation moment front and back and arc suppression coil, and this Wave data is sent to main frame by the GPRS/GSM wireless communication mode, main frame is at first analyzed the situation of change that respectively goes out the measured zero-sequence current of wiretap Monitoring and Controlling terminal in the comparison transformer station, certain gear before the gear of neutral point arc suppression coil is by ground connection transfers to another gear, get back to again then in the process of the preceding gear of former ground connection, variation to a certain degree all can take place in the zero-sequence current of all outlets of transformer station, if the variable quantity maximum of certain bar circuit zero-sequence current before and after the arc suppression coil gear changes, just single phase ground fault has taken place in explanation on this circuit.This circuit is the faulty line that single-phase earthing takes place.Next analyze the situation of change of the measured zero-sequence current of all Monitoring and Controlling terminals on this circuit relatively again, if in this circuit the measured zero-sequence current of the Monitoring and Controlling terminal of certain group # before and after the arc suppression coil gear changes, taken place with this circuit transformer station in the measured zero-sequence current of switch Monitoring and Controlling terminal the variation of same amplitude has taken place, and the measured zero-sequence current variable quantity of other Monitoring and Controlling terminal is smaller, and single-phase earth fault current this group switch of having flowed through just is described.Thereby, draw the line fault section position by the judgement of host analysis software.At this moment, main frame is notified the related work personnel with fault section information with computer screen demonstration, sound and light alarm and mobile phone short messages automatically.The operator on duty can be in view of the above by the switch (also can be set to this switch of computer control automatic disconnection) before the computer distant place control open failure section.Thereby excise, isolated the earth point fault, it is normal that bus instrument transformer open delta output voltage recovers.
When neutral point is earth-free and during through the distribution system generation phase fault of grounding through arc, neutral nondirect earthing network single-phase earth fault positioning device implementation method is as follows:
When neutral point is earth-free and during through the distribution system generation phase fault of grounding through arc, the built-in current transformer of switch and on-pole switch is all experienced above the short-circuit current of circuit running current more than many times in the transformer station of faulty line, Monitoring and Controlling terminal collection that is connected with switch built-in current transformer (CT) and the related data of having stored this fault current, and compare with pre-set set-point (setting value), if this electric current surpasses the given data of setting value, then this group Monitoring and Controlling terminal sends to main frame together with the judgement conclusion with the GPRS/GSM wireless communication mode with this current data.At this moment, if the fault point is the instantaneity phase fault, goes out wiretap in the transformer station and will disconnect the back successful reclosing for the first time.This path monitoring control terminal will be after monitoring the moment of fault current first time, after 0.5 second reclosing blanking time (this moment circuit no current), experience running current, this moment, the instantaneous short circuit fault took place to main frame report circuit in the Monitoring and Controlling terminal of faulty line.Main frame is notified the related work personnel with the transient fault zone field with computer screen demonstration, sound and light alarm and mobile phone short messages.If permanent phase fault has taken place in the fault point, transformer station's internal fault circuit goes out wiretap and will can not overlap after disconnecting for the first time, behind 0.5 second reclosure time (this moment circuit no current), again monitored fault current the second time, transformer station's internal fault line switching will disconnect for the first time again, at this moment, permanent short trouble has taken place to main frame report circuit in all Monitoring and Controlling terminals of faulty line, shown on the display screen of main frame short circuit current the path of process, computer to short circuit current the switch of process done corresponding mark automatically, and change over other color.At this moment, main frame is notified the related work personnel with fault section information with computer screen demonstration, sound and light alarm and mobile phone short messages.The operator on duty will be in view of the above by first switch before the computer control open failure point (this moment, system also can be arranged to automatically perform first switch before the open failure point), thereby excise the faulty component of circuit.After this switch disconnected, the staff will be according to the Fault Isolation prompting of computer screen, and the notice operating personnel of the transformer station transformer station's internal fault circuit that closes goes out wiretap, thereby the fault-free section of having realized circuit recovered to send in the short as far as possible time.
The invention has the beneficial effects as follows: be applied in 66 kilovolts and the following neutral point indirect earthing distribution system, when system's generation single-phase earthing and phase fault, can determine and excise the fault section of circuit fast, thereby ensure the power supply of circuit fault-free section.Improved the automatic operating level of electrical network.
Description of drawings:
Fig. 1 is each part correlation schematic diagram of the present invention;
Fig. 2 is Monitoring and Controlling terminal of the present invention and host work block diagram.
Among the figure:
Main frame
Embodiment:
Below in conjunction with the drawings and specific embodiments the present invention is further described:
As shown in Figure 1, when single phase ground fault took place the d1 point, neutral point indirect earthing distribution system single phase earthing fault locator implementation method was as follows:
(1) when the distribution system generation single phase ground fault of isolated neutral shown in Figure 1: at first, substation bus bar voltage transformer monitoring terminal RV monitors that bus-bar potential transformer open delta output voltage reaches the numerical value of adjusting in advance in the transformer station, single phase ground fault has taken place with GPRS/GSM wireless communication mode notice main frame MA system in bus instrument transformer monitoring terminal RV, notify all transformer substation switch Monitoring and Controlling terminal ZD1 by main frame MA then, ZD2, fault zero-sequence current Wave data before and after moment takes place in ZDn intercepting and storage failure, and these data are sent to main frame MA by the GPRS/GSM wireless communication mode, main frame MA therefrom selects the zero-sequence current circuit (not considering when the zero-sequence current amplitude is too small) of 4 amplitude maximums, carry out the comparison (lateral comparison) of zero-sequence current amplitude and phase place, according to the failure criterion of above-mentioned single-phase earthing, determine that single phase ground fault has taken place which bar circuit.When having determined it is after single phase ground fault has taken place circuit 3, the Wave data that circuit 3 all Monitoring and Controlling terminal ZD, ZS are passed back compares (longitudinal comparison) again, analyze the amplitude and the phase place of the measured zero-sequence current of this circuit all Monitoring and Controlling terminal ZS, ZD with above-mentioned same determination methods, last failure criterion according to above-mentioned single-phase earthing, learn Monitoring and Controlling terminal ZD3, ZS1, ZS4, the measured zero-sequence current of ZS5, the measured zero-sequence current phase place of its phase place and other Monitoring and Controlling terminals is opposite, thereby the localization of faults is positioned at branch line 5.At this moment, main frame MA notifies the related work personnel with fault section information with computer screen demonstration, sound and light alarm and mobile phone short messages automatically.The operator on duty can click cut-off switch S5 by computer mouse in view of the above.Thereby eliminated the earth point fault of branch line 5, it is normal that the open delta output voltage recovers.Thereby guaranteed the power supply of circuit 3 non-fault sections.
(2) when the distribution system d1 of neutral by arc extinction coil grounding shown in Figure 1 some single phase ground fault fault: the gear of neutral point arc suppression coil broke down in back about 3 seconds time, turn down a retaining or heighten a retaining by certain gear before the ground connection, return gear before the former ground connection then again, at this moment, at first analyze and respectively go out wiretap Monitoring and Controlling terminal ZD1 in the transformer station, ZD2, the situation of change of the zero-sequence current that ZDn is measured, at this moment, can measure the measured zero-sequence current of transformer station's outlet 3 Monitoring and Controlling terminal ZD3 variable quantity maximum before and after the gear of fault generation moment front and back and arc suppression coil changes, and the variable quantity of other transformer station's outlet zero-sequence currents is significantly less than the variable quantity of the measured zero-sequence current of transformer station's outlet 3 Monitoring and Controlling terminal ZD3.Illustrate that single-phase earthing occurs in circuit 3.Next the situation of change of analyzing all Monitoring and Controlling terminal ZD, ZS zero-sequence current on the alternative route 3 again is as can be known: the variable quantity basically identical of the zero-sequence current that Monitoring and Controlling terminal ZD3, ZS1, ZS4, ZS5 are measured, and obviously greater than the variable quantity of the measured zero-sequence current of other Monitoring and Controlling terminal of this circuit.Thereby the localization of faults is positioned at branch line 5.
During (3) when isolated neutral shown in Figure 1 or through the distribution system d1 of grounding through arc point generation phase fault, specific implementation of the present invention is as follows:
At this moment, switch D3, S1, S4, the built-in current transformer of S5 was all experienced above the short-circuit current of circuit running current more than many times in short time, and other switch is not all experienced this short-circuit current in the distribution system, the Monitoring and Controlling terminal ZD3 that is connected with switch built-in current transformer (CT), ZS1, ZS4, ZS5 record and the related data of having stored this fault current, and compare with pre-set set-point (setting value), if this electric current surpasses the given data of setting value, Monitoring and Controlling terminal ZD3, ZS1, ZS4, ZS5 sends to main frame MA together with the judgement conclusion with the GPRS/GSM wireless communication mode with this current data.At this moment, if the d1 fault point is the instantaneity phase fault, switch D3 will disconnect the back successful reclosing for the first time in the transformer station.Monitoring and Controlling terminal ZD3, ZS1, ZS4, ZS5 will be after monitoring moment of fault current, after 0.5 second reclosing blanking time (this moment circuit no current), experience running current, transient fault has taken place to main frame MA report circuit in Monitoring and Controlling terminal ZD3, ZS1, ZS4, ZS5 at this moment.If permanent phase fault has taken place in the d1 fault point, switch D3 will can not overlap after disconnecting for the first time in the transformer station.Monitoring and Controlling terminal ZD3, ZS1, ZS4, ZS5 will be after monitoring moment of fault current, behind 0.5 second reclosure time, Monitoring and Controlling terminal ZD3, ZS1, ZS4, ZS5 will monitor one time moment of fault current again again, thereafter, switch D3 will disconnect again in the transformer station, and at this moment, Monitoring and Controlling terminal ZD3, ZS1, ZS4, ZS5 to main frame MA report circuit permanent fault have taken place, and fault current is to have passed through switch D3, S1, S4, S5.Shown on the display screen of main frame MA short circuit current the path of process, on computer screen, computer to short circuit current switch D3, S1, S4, the S5 of process done corresponding mark automatically.At this moment, main frame MA notifies the related work personnel with fault section information with computer screen demonstration, sound and light alarm and mobile phone short messages.The operator on duty will click control cut-off switch S5, the branch line 5 of excision fault by computer mouse in view of the above.At this moment, computer system also can be arranged to automatically perform cut-off switch S5.After S5 disconnected, the staff will be according to the Fault Isolation prompting of computer screen, the notice operating personnel of the transformer station switch D3 in the transformer station that closes, thus realized making circuit fault-free section in the time of lacking as far as possible, to recover to send.
The inside of Monitoring and Controlling terminal and main frame connect each other and the course of work as shown in Figure 2, in Monitoring and Controlling terminal and host work block diagram shown in Figure 2, when the distribution system generation single-phase earthing of neutral point indirect earthing or phase fault, the monitoring of Monitoring and Controlling terminal, control section is gathered zero-sequence current or phase fault current data from the built-in current transformer that transformer station goes out wiretap or circuit on-pole switch (or ring main unit switch), again these data are delivered to main frame by GPRS/GSM wireless communication mode (or other wire communication mode), main frame is by analysis behind the particular location of failure judgement, assign to the Monitoring and Controlling terminal by GPRS/GSM wireless communication mode (or other wire communication mode) again and disconnect the order that transformer station goes out wiretap or circuit on-pole switch (or ring main unit switch), thereby realize excision, isolated fault recovers the purpose of fault-free section power supply.
In Fig. 2, each Monitoring and Controlling terminal is by himself built-in gps satellite time service synchronised clock, transient state, the stable status zero-sequence current data of being gathered are stamped the precise time mark, and the zero-sequence current of gathering as each Monitoring and Controlling terminal for main frame uses than amplitude ratio phase time.
Realization in order to demonstrate the invention; above-mentioned specific embodiment has been described; but other variations of the present invention and modification; it will be apparent to those skilled in the art that, all belong to claim protection range of the present invention in the essence of the disclosure of invention and any modification/variation in the basic principle scope or equivalent transformation.
Claims (2)
1. the device of neutral nondirect earthing network single phase ground fault location, comprise main frame, host analysis software, Monitoring and Controlling terminal, it is characterized in that: each Monitoring and Controlling terminal is installed on distribution line on-pole switch or ring main unit place, and each Monitoring and Controlling terminal is synchronous by gps satellite time service synchronised clock inhibit signal acquisition time.
2. according to the method for the device of the described neutral nondirect earthing network single phase ground fault of claim 1 location, it is characterized in that: between described main frame and the Monitoring and Controlling terminal by GPRS/GSM wireless telecommunications or wired (optical fiber) communication modes Data transmission or assign control command.
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| CN 200710064197 CN101017974A (en) | 2007-03-06 | 2007-03-06 | Single phase grounding failure positioning method and device of neutral point non direct grounding power grid |
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| CN 200710064197 CN101017974A (en) | 2007-03-06 | 2007-03-06 | Single phase grounding failure positioning method and device of neutral point non direct grounding power grid |
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