CN101013149A - Method and apparatus for detecting a fault section in ungrounded distribution power systems - Google Patents
Method and apparatus for detecting a fault section in ungrounded distribution power systems Download PDFInfo
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- CN101013149A CN101013149A CNA2006101356061A CN200610135606A CN101013149A CN 101013149 A CN101013149 A CN 101013149A CN A2006101356061 A CNA2006101356061 A CN A2006101356061A CN 200610135606 A CN200610135606 A CN 200610135606A CN 101013149 A CN101013149 A CN 101013149A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a fault section detection device for detecting fault section by comparison of phase difference, and magnitude of zero-phase current in non-grounded distribution system. The device includes the following parts: line terminal devices which are installed to each section of the lines in the non-grounded distribution system so as to measure inter-line short circuit voltages and the zero-phase currents to transmit the phase differences and magnitude of the zero-phase currents to a central controller after calculating them, and to execute the opening/closing command of a switch corresponding to instructions of the central controller; a circuit fault detection device for detecting whether the circuit happens fault and transferring the detection result to a central control device; and a central control device which requests the line terminal devices to transmit the phase difference and magnitude information and judges the fault section of relative lines after it receives the fault information from the circuit fault detection device, and closes a connection switch, separates the fault section from the system, and switches the normal section to a special line to continue to supply power to load. The invention can easily judge the fault section and supply power to the load under the condition of no power interruption.
Description
Technical field
The present invention relates to compare the fault section detection method and the device thereof of locating by Zero-phase current phase differential and size in a kind of earth-free distribution system, the present invention is when earth-free distribution system generation singlephase earth fault, by circuit fault detecting apparatus, can measure the terminating machine of circuit line voltage and Zero-phase current and the total system that central means is formed, compare back fault location section at the Zero-phase current of each terminating machine measurement of circuit and the phase differential and the size of line voltage, and the method and the device thereof that under the situation that does not have a power failure, fault section are isolated from system.
Background technology
In general, earth-free distribution system is applicable to the system that circuit is short, voltage is low, and the ground capacitance of this circuit is little, so charging current is also little.During the circuit generation singlephase earth fault of isolated neutral system, the fault current that the ground capacitance of normal phase causes will flow into the trouble spot, but since too little and can continue the power supply, and, because main transformer has used △-△ junction style, as long as when transformer fault or inspection repairing, convert the V junction style to, just can send.
But along with the expansion of isolated neutral system, capacity also and then increases, and when singlephase earth fault takes place, charging current will cause indirect arc ground connection and cause abnormal voltage.Fault current during singlephase earth fault is not easy to detect fault below several amperes, therefore can't guarantee the action of ground(preference) relay.And, may make fault coverage expansion and cause short trouble in case protection is failed.When distribution system breaks down, if do not have can be simply the device of fault location type and position automatically, the system manager need carry out visual inspection at large-scale delivery electric line section for fault location point.These operations need a large amount of manpowers and power failure cost.Therefore, study very practical at the judgement of fault type and the detection of trouble spot.
Aspect the protected mode of isolated neutral system; if single circuit then uses superpotential ground connection relay system (OVGR), if multicircuit then uses the direction ground connection relay system (DGR) based on bus zero phase voltage and each circuit Zero-phase current for the failure judgement circuit.
People have delivered relevant research paper recently successively; they comprise: in order to take direction ground connection relay system, can calculate algorithm from voltage and magnitude of current measuring point to the distance of trouble spot by isolated neutral system guard method protecting network system, utilize basic wave voltage and electric current tracing trouble direction algorithm, can calculate the fault signal analysis method of the fault distance of high resistance ground system, the pulse fault detector applied to method, and the method analyzed at the various factors of influence of fault detect etc. of industrial system protection.But also used the suitable mode of sending of exploring faulty circuit by the selectivity grounding relay.
But aforementioned research lays stress on the location of faulty circuit, is not easy to judge the fault phase when singlephase earth fault takes place.Along with the introduction of electrical power distribution automatization system, distribution substation is required to have with the robotization isolating switch with various functions can detection failure algorithm mutually recently.And, the judgement of fault phase is become important increasingly along with the popularizing of buried cable.
When Fig. 1 is existing earth-free distribution system generation ground fault, by along the key diagram that send mode isolated fault section and rushed to repair.Table 1 is aforementioned distribution system Time Chart to fault treating procedure when breaking down.
[table 1]
| Situation | Time | The action situation of isolating switch | |||||
| CB | SW1 | SW2 | SW3 | SW4 | SW5 | ||
| -section (4) has an accident | Fault monitoring CB tripping operation | ||||||
| No-voltage trip time (0.7 second) | |||||||
| -closed circuit again | The closed circuit again time limit (1 minute) | ||||||
| -SW1 is along sending closure | Closed time limit T1 (7 seconds) | ||||||
| -SW2 is along sending closure | Closed time limit T1 (7 seconds) | ||||||
| -SW3 is along sending closure | Closed time limit T1 (7 seconds) | ||||||
| -detection accident again | Detect permanent fault, CB trips again | ||||||
| No-voltage trip time (0.7 second) | |||||||
| -closed circuit again | The closed circuit again time limit (3 minutes) | ||||||
| -SW1 is along sending closure | Closed time limit T1 (7 seconds) | ||||||
| -SW1 is along sending closure | Closed time limit T1 (7 seconds) | ||||||
| -against sending control instruction far away | According to the long distance steering order and closure | ||||||
When aforementioned distribution line breaks down, with direction of passage grounding relay (DGR) failure judgement circuit, circuit breaker (Circuit Braker is hereinafter to be referred as " CB ") is started, the circuit of faulty circuit will have a power failure.In Japan,, therefore whole sections of circuit are all had a power failure because great majority do not use reclosing.After CB started and causes no-voltage condition, all sending type robotization isolating switchs of relevant distribution line were with automatic cutout.Through behind the certain hour, CB will be closed circuit again and distribution line is applied voltage, according to first, second, the 3rd mode makes the robotization breaker closing successively.Behind the robotization breaker closing near fault section, because continuing the permanent fault state, the CB of electric substation will restart.At this moment, near trouble spot and last closed isolating switch after closure owing in the time of appointment, have a power failure again, judge that therefore the protection section of oneself permanent fault has taken place and entered the Lock state.After power supply was pressurized, power supply had disappeared under the situation of a special time because pressurized state is not kept, and the isolating switch that therefore is close to after the fault section will judge that the mains side of own front fault has taken place and entered the Lock state.Later action is the same with when beginning, and circuit breaker is through closed again behind the certain hour, and first robotization isolating switch with second and so on carries out closed at interval again according to certain hour, then the normal reach of mains side is powered.
Aforesaid fault handling mode allows distribution system to connect other circuit, comprises the most distribution system of Korea S of not using Loop shape distribution system and taking treesystem, and aforementioned fault handling mode goes for all distribution lines.Though the protected mode that Japan uses can the failure judgement circuit and by along sending mode fault location section; yet; owing to taked along sending mode; in the process of fault location section, can't avoid stopping power supply to load; along with the circuit breaker switching number of times increases, also improved the possibility of isolating switch handoff failure.
In order to overcome aforementioned limitations, the applicant has developed " faulty circuit of earth-free distribution system and fault phase determination methods " (patented claim 2003-060175 number), aforementioned techniques is used selectivity grounding relay (SGR) and according to zero phase voltage of bus and the Zero-phase current detection failure circuit of each circuit, and the while according to the Zero-phase current failure judgement of the line voltage of detected aforementioned faulty circuit and faulty circuit mutually.When isolated neutral system is introduced electrical power distribution automatization system, robotization isolating switch on the circuit is obtained voltage and current information can be realized preceding method by being positioned at, and the validity of preceding method is the testing identity by electro-magnetic transient analytical tool EMTP (Electro Magnetic Transient Program) simulated program already.
Summary of the invention
" faulty circuit of earth-free distribution system and fault phase determination methods " (Republic of Korea's patented claim 2003-060175 number) that the present invention is directed to the applicant's exploitation and apply for a patent improves, the purpose of this invention is to provide the fault section detection method and the device thereof of relatively locating by Zero-phase current phase differential and size in a kind of earth-free distribution system, the present invention includes circuit fault detecting apparatus; Can measure the line termination device of circuit line voltage and Zero-phase current; And receive from fault location section after information of aforementioned each device, then with the no power failure mode isolated fault section central control unit of the process of repairing of robbing of going forward side by side.When earth-free distribution system generation earth fault, the present invention can isolate fault section under the situation that does not have a power failure from system, continues electric.
In order to realize aforementioned purpose, the invention provides the fault section pick-up unit of relatively locating by Zero-phase current phase differential and size in a kind of earth-free distribution system, the present invention includes the following units: each section that is positioned at circuit, measure short-circuit between conductors voltage and Zero-phase current and calculate its phase differential and size, be sent to central control unit then, carry out the disconnection of killer switch or a plurality of line termination devices of close command according to the instruction of central control unit; During line failure, check whether its circuit breaks down and check result is sent to the circuit fault detecting apparatus of central control unit; And the molar behavior of control system, after receiving failure message from the aforementioned circuit failure detector, each line termination device of requirement line related transmits phase information and judges the fault section of line related, closed interconnection switch, fault section is isolated from system, normal reach is switched to special line, continue as the central control unit of electric.
The invention provides the fault section detection method of relatively locating by Zero-phase current phase differential and size in a kind of earth-free distribution system, comprise: each section that is positioned at circuit, measure the phase differential and size of short-circuit between conductors voltage and Zero-phase current, open/a plurality of line termination devices of make and break pass according to the instruction of central authorities; Check whether circuit breaks down, then check result is sent to the circuit fault detecting apparatus of central authorities; And after receiving fault detection address from the aforementioned circuit failure detector, control the central control unit of the action of aforementioned line termination device, it is characterized in that comprising the following steps: that the aforementioned circuit failure detector utilizes the zero phase voltage of bus and the Zero-phase current of circuit to check faulty circuit, transmit the first step of failure message then to central control unit; Aforementioned central control unit requires short-circuit voltage and the phase differential of Zero-phase current and second step of size information between conveyer line to each line termination device of aforementioned faulty circuit; Aforementioned line termination device is calculated the phase differential and size of short-circuit between conductors voltage and Zero-phase current according to the requirement of aforementioned central control unit, send the third step of central control unit then respectively to; Aforementioned central control unit compares also failure judgement section at phase differential and the size information from aforementioned each line termination device, if the fault section load-side comprises normal reach, then fault section is isolated from system, then normal reach is switched to the 4th step of special line.
Comprise the following steps: to measure the short-circuit between conductors voltage and the Zero-phase current of circuit and calculate the step of its phase differential by the performed third step of aforementioned each line termination device of the present invention; After receiving requirement, the aforementioned phase information that calculates is sent to the step of central control unit from aforementioned central control unit; And after receiving instruction, according to the step of aforementioned instruction disconnection or close circuit breaker switch from aforementioned central control unit.
In the 4th performed step of aforementioned central control unit of the present invention, compare at phase differential and size information from each Zero-phase current of each end device of aforementioned line related, if the phase differential of the Zero-phase current of adjacent two end devices of front/rear side is in 90 ~ 180 ° of scopes, and Zero-phase current size gap just is judged as fault section to the installation section of line related end device when having exceeded range of allowable error.
When earth-free distribution system generation earth fault, the present invention can utilize the phase differential of the end device that is positioned at circuit and size information failure judgement section easily, continues as electric under the situation that does not have a power failure.
After isolated neutral system was introduced automated system, the present invention can rely on the information of the circuit fault detecting apparatus that is positioned at each circuit exit of electric substation and the voltage that end device measured that is positioned at circuit to obtain realization simply with current information.
By the testing identity of electro-magnetic transient analytical tool EMTP (Electro Magnetic Transient Program) simulated program, its feasibility was very high to the validity of fault section method of discrimination of the present invention already.
Description of drawings
When Fig. 1 is existing earth-free distribution system generation ground fault, by along the key diagram that send mode to isolate fault section and rushed to repair.
Fig. 2 is the structural drawing of fault section pick-up unit of the present invention and the key diagram of each action.
Zero-phase current distribution plan when Fig. 3 is the earth-free distribution system generation of the present invention earth fault.
Be the Zero-phase current directional diagram of the faulty circuit at center with the trouble spot when Fig. 4 is the earth-free distribution system generation of the present invention earth fault.
The key diagram in Fig. 5 failure judgement zone that is the present invention when earth-free distribution system generation earth fault.
Fig. 6 is simulation system and system's composition diagram of one embodiment of the invention.
Fig. 7 is after earth fault takes place, the zero phase voltage vector figure of Zero-phase current on each circuit and bus.
Fig. 8 is after earth fault takes place, the short-circuit between conductors voltage that measures at each terminating machine of faulty circuit and the vector plot of Zero-phase current.
The explanation of the main symbol of＜figure 〉
10: circuit fault detecting apparatus 21,22: line termination device
30: central control unit
Embodiment
Be elaborated below in conjunction with accompanying drawing, with the aforementioned purpose of the present invention of easier understanding, feature and advantage.
Below in conjunction with drawings and Examples fault section detection method and the device thereof based on the bit comparison of Zero-phase current phase in the earth-free distribution system of the present invention is described further.
Fig. 2 is that simple structural drawing and the fault section based on the fault section pick-up unit of Zero-phase current phase bit comparison detects the action calcspar in the earth-free distribution system of one embodiment of the invention.Aforementioned distribution system comprises a plurality of line termination devices (21,22) that are positioned at circuit; Circuit fault detecting apparatus (10); And central control unit (30).Present embodiment compares at Zero-phase current phase differential and size, and the fault location section also isolates it from system, the normal reach of fault section load-side is switched to special line, continues as all electric under the situation that does not have a power failure.
Aforementioned each line termination device (21,22) measures the line voltage of circuit and the phase differential and size of Zero-phase current, when central control device requires, just its phase information is sent to central control unit (30) respectively, receives disconnection or the close command of carrying out killer switch after the instruction of central control unit.
During line failure, aforementioned circuit failure detector (10) will check whether its circuit fault has taken place, and when breaking down, then failure message will be sent to central control unit (30).
Aforementioned central control unit (30) is responsible for the molar behavior of system, when receiving the failure message from aforementioned circuit failure detector (10), to check line related topology (topology) and require to transmit phase information to the line related end device, then each phase information from each end device of aforementioned line related is compared, phase differential between two end devices of adjacent front/rear side is in 90 ~ 180 ° of scopes, and Zero-phase current size gap is when having exceeded range of allowable error, just the line related end device is installed section and be judged as fault section, if comprise normal reach in the aforementioned fault section, behind the terminating machine of then closed interconnection switch and open failure section, fault section is isolated from distribution system, under the situation that does not have a power failure, continue as the electric of normal reach.
Action step to earth-free distribution system further specifies below.It comprises the following steps: that at first the aforementioned circuit failure detector utilizes the zero phase voltage of bus and the Zero-phase current of circuit to check faulty circuit, transmits failure message (the 1. process of accompanying drawing or 6. process) to central control unit then; Then, the topology of aforementioned central control unit retrieval distribution system, and require the phase differential of short-circuit voltage and Zero-phase current between conveyer line and size information (the 2. process of accompanying drawing and 8. process) to each line termination device of aforementioned faulty circuit according to its result; Then, aforementioned line termination device is calculated the phase differential and size of short-circuit between conductors voltage and Zero-phase current according to the requirement of aforementioned central control unit, send central control unit then respectively to; At last, aforementioned central control unit compares also failure judgement section at phase differential and the size information from aforementioned each line termination device, if the fault section load-side comprises normal reach, then fault section is isolated from system, then normal reach is switched to special line (the 4. process of accompanying drawing
5. process and 7. process).
Zero-phase current distribution plan when Fig. 3 is the earth-free distribution system generation of the present invention earth fault.For the action of aforementioned circuit failure detector (10) failure judgement circuit is described, Fig. 3 supposes that circuit C breaks down and shown the distribution of fault current.
As shown in Figure 3, the charging current (I of normal circuit A and B
C3, I
C2) flowing into the position of fault by bus, the bus side of faulty circuit C and the charging current of load-side then flow to the trouble spot.These electric currents all are charging current and homophase, and its resultant current flows to the trouble spot, and then form the electric current (I of the neutral point of the ground connection type transformer (GPT:ground potential transformer) of flowing through
n).At this moment, charging current I
C1, I
C2, I
C3Zero phase voltage (the V that generates during than fault
0) preceding more 90 °, flow to the electric current (I of ground connection type transformer (GPT)
n) then with zero phase voltage (V
0) homophase, so flow to the zero phase voltage (V that the phase place of integral ground fault current of the trouble spot of accident circuit measures than ground connection type transformer (GPT) in the bus
0) preceding more about 30～80 °.
Yet, Zero-phase current direction on the normal circuit is opposite with Zero-phase current direction on the faulty circuit, when earth fault takes place, is benchmark with the zero phase voltage phase place of bus, if the phase place of Zero-phase current has preceding more characteristic, be this circuit judges faulty circuit just.
Therefore, consider the ground connection type transformer (GPT) of measuring bus zero phase voltage error, be positioned at the error and the amplitude of the zero-phase current transformer of each circuit, when the Zero-phase current phase place of circuit is compared with bus zero phase voltage phase place, when being positioned at-60 °～+ 120 ° scopes, aforementioned circuit failure detector (10) just judges that this circuit is a faulty circuit.
Circuit fault detecting apparatus (10) is according to the Zero-phase current of the zero phase voltage of bus and each circuit and behind the fault location circuit, its result is sent to central control unit (30), circuit line voltage that aforementioned central control unit (30) is measured according to each line termination device (21,22) of aforementioned faulty circuit again and Zero-phase current and failure judgement section.
Be the Zero-phase current directional diagram of the faulty circuit at center with the trouble spot when Fig. 4 is the earth-free distribution system generation of the present invention earth fault.The following describes aforementioned central control unit (30) according to the phase differential of each line termination device (21,22) and size information and the process of detection failure section.
At first, for the purpose of the Zero-phase current failure judgement section that the zero phase voltage that is measured for the ground connection type transformer (GPT) according to electric substation and each terminating machine are measured, total systems such as ground connection type transformer (GPT) and each end device need be kept synchronously, so all terminating machines all need to install synchronising apparatus.
The fault section detection method of central control unit of the present invention as long as had information of voltage that a plurality of line termination devices (21,22) of being positioned at circuit are measured and the current information can the failure judgement section, and then have solved foregoing problems.
As shown in Figure 4, the front/rear section of the Zero-phase current that each end device measured in the trouble spot that is positioned at faulty circuit has different directions, the line voltage vector of isolated neutral system before and after fault is constant, therefore be benchmark relatively during the phase place of Zero-phase current with the line voltage of arbitrary phase in the three-phase, just can find that the phase differential between the line termination device of the line termination device of trouble spot front end and rear end is 180 °.Therefore, after aforementioned central control unit (30) is received the Zero-phase current phase differential and size information that each line termination device from faulty circuit transmits separately, the phase information that compares the Zero-phase current of two adjacent lines end devices, that is to say, the phase place of end line end device was a benchmark in the past, relatively the phase information of its rear end line termination device as long as its phase differential is 180 °, can be judged as fault section to this section.
The key diagram in Fig. 5 failure judgement zone that is the present invention when earth-free distribution system generation earth fault.Among Fig. 5, X-axis is the difference (Θ between the phase differential of the phase differential of k-1 line termination device and k line termination device
D ω k: calculating formula 1), the phase differential of k line termination device refers to the arbitrary line voltage of line termination device and the phase differential (Θ of Zero-phase current
k: calculating formula 2).
[calculating formula 1]
(Θ at this moment,
K-1Be the phase differential of k-1 line termination device, Θ
kIt is the phase differential of k line termination device.)
[calculating formula 2]
(V at this moment,
LL kBe arbitrary line voltage of line termination device, I
o kIt is Zero-phase current.)
Therefore, consider the line voltage of each end device measurement of circuit and the error and the amplitude thereof of Zero-phase current, if the phase differential of two line termination devices is in 180 °～90 ° scopes, central control unit (30) just is judged as fault section to the section between two line termination devices.
＜embodiment 〉
Fig. 6 is simulation system and system's composition diagram of one embodiment of the invention.In order to verify algorithm proposed by the invention, we have designed following system model: system voltage is 154[kV]/22.9[kV] (y-△ tie lines), distribution line uses ACSR 58[mm] (Z
1=0.6959+j0.5144, Z
0=1.1028+j1.4437[Ω]) line, the length of each feed line is #l Feeder-15[km], #2 Feeder-10[km], #3 Feeder-15[km], system load is the about 2[MVA of every circuit], the line charging electric current of most critical factor is 18[mA/km during as failure judgement] about.Use the EMTP process simulation to go out earth fault then and verified the algorithm that is proposed.
Adopted the DFT algorithm when in the moment of voltage and electric current data, taking out its size, used the Matlab program to realize the algorithm that is proposed, and shown the checking result with phase place.
When aforementioned system shown in Figure 6 generation earth fault, judged faulty circuit according to the zero phase voltage of bus and the Zero-phase current size and the phase place of each circuit.Fig. 7 is after earth fault takes place, the zero phase voltage vector figure of Zero-phase current that measures on each circuit and bus.Because preceding more 88 ° of the Zero-phase currents of #1 feeder than the zero phase voltage of bus, the Zero-phase current of #2 feeder lags behind 87 ° than the zero phase voltage of bus, preceding more 89 ° of the Zero-phase currents of #3 feeder than the zero phase voltage of bus, therefore last judgement #3 feeder is the fault circuit, then this information is sent to central control unit.
When aforementioned system shown in Figure 6 generation earth fault, according to the line voltage of each terminating machine measurement and the phase differential and the big or small failure judgement section of Zero-phase current, Fig. 8 is after earth fault taking place and judging faulty circuit, is positioned at the short-circuit between conductors voltage that each terminating machine of faulty circuit measures and the vector plot of Zero-phase current.Why the phase place of each line termination device neutral voltage vector is not both because voltage on the circuit descends and to cause, can not cause great influence when the failure judgement circuit.As can be seen, the phase place of Zero-phase current is that 180 ° difference has appearred in the center with the trouble spot.
[table 2]
| The isolating switch phase place | SW1 | SW2 | SW3 | SW4 |
| Vab | -126.3° | -126.9° | -127.7° | -128.4° |
| Io | -67.3° | 67.3° | 112.5° | 112.5° |
| |Vab-Io| | 58.9° | 59.5° | 240.3° | 240.9° |
| Θ Dω k | - | 0.6° | 180.8° | 0.6° |
Aforementioned table 2 has been listed the line voltage that each line termination device measured of faulty circuit and the phase place of Zero-phase current, the result who also has each terminating machine to calculate with calculating formula 1 according to the phase differential of voltage/current for the fault location section.At last, after judging by the fault section detection method, judge that fault has taken place the section Section #2 between SW2 and the SW3.
Claims (5)
1. compare the fault section pick-up unit of locating by Zero-phase current phase differential and size in an earth-free distribution system, comprising:
Be positioned at each section of circuit, measure short-circuit between conductors voltage and Zero-phase current and calculate its phase differential and size, be sent to central control unit then, carry out the disconnection of killer switch or a plurality of line termination devices of close command according to the instruction of central control unit;
During line failure, check whether its circuit breaks down and check result is sent to the circuit fault detecting apparatus of central control unit; And
The molar behavior of control system, after receiving failure message from the aforementioned circuit failure detector, each line termination device of requirement line related transmits phase information and judges the fault section of line related, closed interconnection switch, fault section is isolated from system, normal reach is switched to special line, continue as the central control unit of electric.
2. the fault section pick-up unit of relatively locating by Zero-phase current phase differential and size in the earth-free distribution system according to claim 1 is characterized in that:
The judgment standard of aforementioned central control unit is:
Compare at phase differential and size information from each Zero-phase current of each end device of aforementioned line related, if the phase differential of the Zero-phase current of adjacent two end devices of front/rear side is in 90～180 ° of scopes, and Zero-phase current size gap just is judged as fault section to the installation section of line related end device when having exceeded range of allowable error.
3. compare the fault section detection method of locating by Zero-phase current phase differential and size in an earth-free distribution system, comprise: each section that is positioned at circuit, measure the phase differential and size of short-circuit between conductors voltage and Zero-phase current, open/a plurality of line termination devices of make and break pass according to the instruction of central authorities; Check whether circuit breaks down, then check result is sent to the circuit fault detecting apparatus of central authorities; And after receiving fault detection address, control the central control unit of the action of aforementioned line termination device from the aforementioned circuit failure detector, it is characterized in that comprising the following steps:
The aforementioned circuit failure detector utilizes the zero phase voltage of bus and the Zero-phase current of circuit to check faulty circuit, transmits the first step of failure message then to central control unit
Aforementioned central control unit requires short-circuit voltage and the phase differential of Zero-phase current and second step of size information between conveyer line to each line termination device of aforementioned faulty circuit;
Aforementioned line termination device is calculated the phase differential and the Zero-phase current size of short-circuit between conductors voltage and Zero-phase current according to the requirement of aforementioned central control unit, sends the third step of central control unit then respectively to; And
The 4th step that aforementioned central control unit compares back failure judgement section at phase differential and size information from aforementioned each line termination device.
4. the fault section detection method of relatively locating by Zero-phase current phase differential and size in the earth-free distribution system according to claim 3 is characterized in that:
The third step performed at aforementioned line termination device comprises:
Measure the short-circuit between conductors voltage and the Zero-phase current of circuit and calculate its phase differential and the step of Zero-phase current size;
After receiving requirement, the aforementioned phase differential that calculates and Zero-phase current size information are sent to the step of central control unit from aforementioned central control unit; And
After receiving instruction, according to the step of aforementioned instruction disconnection or close circuit breaker switch from aforementioned central control unit.
5. the fault section detection method of relatively locating by Zero-phase current phase differential and size in the earth-free distribution system according to claim 3 is characterized in that:
In the 4th performed step of aforementioned central control unit,
Compare at phase differential and size information from each Zero-phase current of each end device of aforementioned line related, if the phase differential between two end devices of adjacent front/rear side is in 90～180 ° of scopes, and the Zero-phase current size just is judged as fault section to the installation section of line related end device when having exceeded range of allowable error.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020050099764 | 2005-10-21 | ||
| KR1020050099764A KR100709980B1 (en) | 2005-10-21 | 2005-10-21 | Method and apparatus for detecting a fault section using comparison of phase difference and magnitude difference bewteen zero phase currents in ungrounded distribution power systems |
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| Publication Number | Publication Date |
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| CN101013149A true CN101013149A (en) | 2007-08-08 |
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| CNA2006101356061A Pending CN101013149A (en) | 2005-10-21 | 2006-10-17 | Method and apparatus for detecting a fault section in ungrounded distribution power systems |
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| Country | Link |
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| JP (1) | JP2007116893A (en) |
| KR (1) | KR100709980B1 (en) |
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| KR100709980B1 (en) | 2007-04-20 |
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