CN102148495A - Single-phase earth fault self-healing device and system - Google Patents
Single-phase earth fault self-healing device and system Download PDFInfo
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- CN102148495A CN102148495A CN2011100519679A CN201110051967A CN102148495A CN 102148495 A CN102148495 A CN 102148495A CN 2011100519679 A CN2011100519679 A CN 2011100519679A CN 201110051967 A CN201110051967 A CN 201110051967A CN 102148495 A CN102148495 A CN 102148495A
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Abstract
The invention provides a single-phase earth fault self-healing device, which is arranged in a substation or switching station f a power distribution system, and comprises a fault detecting module, a fault line determining module, a communicating module, a judging module, and a self-healing module. The fault detecting module detects whether single-phase earth faults occur in the power distribution system or not; the fault line determining module determines the first information of a line with the single-phase earth fault; the communicating module transmits the first information to the outside and receives the second information of the line with the single-phase earth fault from the outside; the judging module compares the first information with the second information so as to confirm the line with the with the single-phase earth fault; and the self-healing module gives out an on-off actuating signal when the line with the single-phase earth fault is determined by the judging module; therefore, an interconnection switch at the load side of the line with the single-phase earth fault is turned off, then an incoming switch at the load side f the line with the single-phase earth fault is turned on, and finally a switch at the power side of the line with the single-phase earth fault is turned on. The invention also provides a single-phase earth fault self-healing system, which guarantees that the load when isolating the single-phase earth fault is not powered off.
Description
Technical field
The present invention relates to protecting electrical power system and control technology, in particular to single phase ground fault self-healing device and system.
Background technology
Fault self-recovery refers to need not or only needs a small amount of human intervention to realize the isolation of in-problem components and parts in the electric power networks or make it recover normal move, and minimizes or avoid user's power failure.The core of intelligent power distribution net construction is to realize system self-healing.The content of self-healing comprises automatic trouble diagnosis, Fault Isolation and system's self-recovery.The target of self-healing is to avoid load to have a power failure, and guarantees user's power supply reliability.
Distribution line directly links to each other with load, the reliability of the safe and reliable operation direct relation load power supply of distribution line, however distribution line failure is inevitable.Handle around distribution line failure, work about electric power person has carried out research extensively and profoundly.Around short trouble, the distribution line automatic technology has been proposed; Single phase ground fault around not constituting short-circuit loop has proposed single-phase earthing circuit decision technology.The distribution line automatic technology is after short trouble takes place, and failure judgement realizes Fault Isolation fast, after Fault Isolation, makes the power supply of dead electricity load restoration.Single-phase earthing circuit decision technology after single phase ground fault takes place, is selected ground path, again by artificial excision ground path, isolated fault.Distribution line failure treatment technology described above in order to protect the safety of power equipment, when fault takes place, is at first isolated faulty line from system.Existing power distribution network generally adopts closed-loop structure, the open loop operation.When the arbitrary power circuit in the power distribution network of load power supply hinder for some reason be forced to out of service after, this power circuit with load have to have a power failure.Existing distribution line failure treatment technology can not satisfy the requirement of intelligent power distribution net fault self-recovery.
Therefore, in order to satisfy the self-healing requirement, guaranteeing to load in isolating the single phase ground fault process not dead electricity needs a kind of new single phase ground fault treatment technology.
Summary of the invention
In view of this, technical problem to be solved by this invention is, a kind of single phase ground fault self-healing device and single phase ground fault self-healing system are provided, are implemented in the isolation single phase ground fault circuit process and can guarantee the not dead electricity of loading, satisfy the self-healing requirement of distribution system.
The invention provides a kind of single phase ground fault self-healing device, be arranged in the transformer station or switching station of distribution system, comprise: fault detection module, faulty line determination module, communication module, judge module and self-healing module, wherein, described fault detection module, receive the voltage that voltage transformer is gathered, detect in real time whether single phase ground fault takes place in the described distribution system; Described faulty line determination module when described fault detection module is determined described single phase ground fault takes place, according to the electric current that current transformer collects, is determined the first information of the circuit of the described single phase ground fault of generation; Described communication module, the first information of the circuit of the described single phase ground fault of generation that described faulty line determination module is definite is sent to the outside, and from described outside second information that receives the circuit that described single phase ground fault takes place; Described judge module, the described first information and described second information are compared, whether with the circuit of determining the described single phase ground fault of generation that described faulty line determination module is determined with from the circuit of the described single phase ground fault of generation of described outside is the same line road, when the described first information is identical with described second information, determine that described circuit is the single phase ground fault circuit; And described self-healing module, when described judge module is determined described single phase ground fault circuit, send switch actuating signals, make the interconnection switch closure of the load side of described single phase ground fault circuit, then, the service entrance switch of the load side of described single phase ground fault circuit is opened, made the switch opens of the mains side of described single phase ground fault circuit at last.
In technique scheme, preferably, described fault detection module detects the three-phase voltage of the bus of described transformer station or switching station in real time, described three-phase voltage and setting value are compared, to determine whether described distribution system described single phase ground fault takes place, wherein, described setting value comprises first setting value and second setting value, described first setting value is greater than described second setting value, any two phase voltages are all greater than described first setting value in described three-phase voltage, residue one phase voltage in the described three-phase voltage is then judged described single phase ground fault is taken place during less than described second setting value.
In technique scheme, preferably, described first setting value is 1.2 times a phase voltage, and described second setting value is 0.5 times a phase voltage.
In technique scheme, preferably, described faulty line determination module is based on the definite circuit that described single phase ground fault takes place of relativeness of the relativeness and the polarity of the amplitude between the electric current in all outlets of described transformer station or described switching station.
In technique scheme, preferably, described faulty line determination module comprises: data processing unit, be used for the current traveling wave in all outlets of the described transformer station that collects or described switching station is carried out wavelet transformation respectively to ask for wavelet conversion coefficient, the modulus maximum that extracts described wavelet conversion coefficient obtains the polarity and the amplitude Characteristics of described current traveling wave; The circuit determining unit, the polarity and the amplitude Characteristics that are used for the described current traveling wave in relatively all outlets, to determine to take place the circuit of described single phase ground fault, wherein, it is maximum and that the polarity of current traveling wave of circuit of described single phase ground fault takes place is opposite with the polarity of the current traveling wave of non-earth fault line the amplitude of current traveling wave of circuit of described single phase ground fault to take place.
In technique scheme, preferably, the wavelet function of described wavelet transformation is the single order derived function of cubic B-spline function, and described wavelet transformation is four layers of wavelet transformation.
In technique scheme, preferably, the sample frequency of described current traveling wave is 1 megahertz, and length is 128 microseconds during data window.
The present invention also provides a kind of single phase ground fault self-healing system, comprise: in the transformer station of distribution system, be provided with the above-described first single phase ground fault self-healing device, in the switching station of distribution system, be provided with the above-described second single phase ground fault self-healing device, wherein, the described first single phase ground fault self-healing device, detect described distribution system whether single phase ground fault takes place, when described single phase ground fault takes place in described distribution system, determine the first information of the circuit of the described single phase ground fault of generation, the described first information is sent to the described second single phase ground fault self-healing device, and reception is from second information of the circuit of the definite described single phase ground fault of generation of the described second single phase ground fault self-healing device, the described first information and described second information are compared, whether the circuit of the described single phase ground fault of determining with the circuit of determining the described single phase ground fault of generation that the described first single phase ground fault self-healing device is determined and the described second single phase ground fault self-healing device of generation is the same line road, when the described first information is identical with described second information, determine that described circuit is the single phase ground fault circuit, when determining described single phase ground fault circuit, send switch actuating signals, make the interconnection switch closure of the load side of described single phase ground fault circuit, then, the service entrance switch of the load side of described single phase ground fault circuit is opened, made the switch opens of the mains side of described single phase ground fault circuit at last; The described second single phase ground fault self-healing device, detect described distribution system whether described single phase ground fault takes place, when described single phase ground fault takes place in described distribution system, determine second information of the circuit of the described single phase ground fault of generation, described second information is sent to the described first single phase ground fault self-healing device, and reception is from the first information of the circuit of the definite described single phase ground fault of generation of the described first single phase ground fault self-healing device, the described first information and described second information are compared, whether the circuit of the described single phase ground fault of determining with the circuit of determining the described single phase ground fault of generation that the described second single phase ground fault self-healing device is determined and the described first single phase ground fault self-healing device of generation is the same line road, when described second information is identical with the described first information, determine that described circuit is the single phase ground fault circuit, when determining described single phase ground fault circuit, send switch actuating signals, make the interconnection switch closure of the load side of described single phase ground fault circuit, then, the service entrance switch of the load side of described single phase ground fault circuit is opened, made the switch opens of the mains side of described single phase ground fault circuit at last.
By technical scheme of the present invention, can detect single phase ground fault, determine to take place the circuit of single phase ground fault, when the isolated fault circuit, do not influence the power supply of load, satisfy the fault self-recovery requirement.
Description of drawings
Fig. 1 shows the block diagram of single phase ground fault self-healing device according to an embodiment of the invention;
Fig. 2 shows the block diagram of single phase ground fault self-healing system according to an embodiment of the invention;
Fig. 3 shows the schematic diagram of power distribution network primary system according to an embodiment of the invention;
Fig. 4 shows according to an embodiment of the invention, and single phase ground fault self-healing device carries out the flow chart that single phase ground fault detects;
Fig. 5 shows the flow chart that single phase ground fault self-healing device is according to an embodiment of the invention determined the single phase ground fault circuit;
Fig. 6 shows the flow chart that single phase ground fault self-healing device according to an embodiment of the invention carries out Fault Isolation; And
Fig. 7 shows the flow chart that single phase ground fault self-healing system according to an embodiment of the invention carries out fault self-recovery.
Embodiment
In order more to be expressly understood above-mentioned purpose of the present invention, feature and advantage, the present invention is further described in detail below in conjunction with the drawings and specific embodiments.
Set forth a lot of details in the following description so that fully understand the present invention, still, the present invention can also adopt other to be different from other modes described here and implement, and therefore, the present invention is not limited to the restriction of following public specific embodiment.
Fig. 1 shows the block diagram of single phase ground fault self-healing device according to an embodiment of the invention.
As shown in Figure 1, single phase ground fault self-healing device 100 according to an embodiment of the invention, be arranged in the transformer station or switching station of distribution system, comprise: fault detection module 102, faulty line determination module 104, communication module 106, judge module 108 and self-healing module 110, wherein, described fault detection module 102 receives the voltage that voltage transformer is gathered, and detects in real time whether single phase ground fault takes place in the described distribution system; Described faulty line determination module 104 when described fault detection module is determined described single phase ground fault takes place, according to the electric current that current transformer collects, is determined the first information of the circuit of the described single phase ground fault of generation; Described communication module 106, the first information of the circuit of the described single phase ground fault of generation that described faulty line determination module 104 is determined is sent to the outside, and from described outside second information that receives the circuit that described single phase ground fault takes place; Described judge module 108, the described first information and described second information are compared, whether with the circuit of determining the described single phase ground fault of generation that described faulty line determination module 104 is determined with from the circuit of the described single phase ground fault of generation of described outside is the same line road, when the described first information is identical with described second information, determine that described circuit is the single phase ground fault circuit; And described self-healing module 110, when described judge module 108 is determined described single phase ground fault circuit, send switch actuating signals, make the interconnection switch closure of the load side of described single phase ground fault circuit, then, the service entrance switch of the load side of described single phase ground fault circuit is opened, made the switch opens of the mains side of described single phase ground fault circuit at last.
In technique scheme, preferably, described fault detection module 102 detects the three-phase voltage of the bus of described transformer station or switching station in real time, described three-phase voltage and setting value are compared, to determine whether described distribution system described single phase ground fault takes place, wherein, described setting value comprises first setting value and second setting value, described first setting value is greater than described second setting value, any two phase voltages are all greater than described first setting value in described three-phase voltage, residue one phase voltage in the described three-phase voltage is then judged described single phase ground fault is taken place during less than described second setting value.
In technique scheme, preferably, described first setting value is 1.2 times a phase voltage, and described second setting value is 0.5 times a phase voltage.
In technique scheme, preferably, described faulty line determination module 104 is based on the definite circuit that described single phase ground fault takes place of relativeness of the relativeness and the polarity of the amplitude between the electric current in all outlets of described transformer station or described switching station.
In technique scheme, preferably, described faulty line determination module 104 comprises: data processing unit 1042, be used for the current traveling wave in all outlets of the described transformer station that collects or described switching station is carried out wavelet transformation respectively to ask for wavelet conversion coefficient, the modulus maximum that extracts described wavelet conversion coefficient obtains the polarity and the amplitude Characteristics of described current traveling wave; Circuit determining unit 1044, the polarity and the amplitude Characteristics that are used for the described current traveling wave in relatively all outlets, to determine to take place the circuit of described single phase ground fault, wherein, it is maximum and that the polarity of current traveling wave of circuit of described single phase ground fault takes place is opposite with the polarity of the current traveling wave of non-earth fault line the amplitude of current traveling wave of circuit of described single phase ground fault to take place.
In technique scheme, preferably, the wavelet function of described wavelet transformation is the single order derived function of cubic B-spline function, and described wavelet transformation is four layers of wavelet transformation.
In technique scheme, preferably, the sample frequency of described current traveling wave is 1 megahertz, and length is 128 microseconds during data window.
The single phase ground fault self-healing device of embodiments of the invention, can detect distribution system exactly whether single phase ground fault takes place, if the circuit that single phase ground fault can also determine to take place single phase ground fault takes place, and the circuit of the generation single phase ground fault of determining with the outside compares, if two circuit is the same line road, then can judge the single phase ground fault circuit of distribution system, carry out the isolation of single phase ground fault circuit then, can not influence the normal power supply of load.
Fig. 2 shows the block diagram of single phase ground fault self-healing system according to an embodiment of the invention;
As shown in Figure 2, single phase ground fault self-healing system 200 comprises according to an embodiment of the invention: be provided with the first single phase ground fault self-healing device 202 as shown in Figure 1 in the transformer station of distribution system, in the switching station of distribution system, be provided with the second single phase ground fault self-healing device 204 as Fig. 1 explanation, wherein, the described first single phase ground fault self-healing device 202, detect described distribution system whether single phase ground fault takes place, when described single phase ground fault takes place in described distribution system, determine the first information of the circuit of the described single phase ground fault of generation, the described first information is sent to the described second single phase ground fault self-healing device 204, and receive second information of the circuit of the described single phase ground fault of determining from the described second single phase ground fault self-healing device 204 of generation, the described first information and described second information are compared, whether the circuit of the described single phase ground fault of determining with the circuit of determining the described single phase ground fault of generation that the described first single phase ground fault self-healing device 202 is determined and the described second single phase ground fault self-healing device 204 of generation is the same line road, when the described first information is identical with described second information, determine that described circuit is the single phase ground fault circuit, when determining described single phase ground fault circuit, send switch actuating signals, make the interconnection switch closure of the load side of described single phase ground fault circuit, then, the service entrance switch of the load side of described single phase ground fault circuit is opened, made the switch opens of the mains side of described single phase ground fault circuit at last; The described second single phase ground fault self-healing device 204, detect described distribution system whether described single phase ground fault takes place, when described single phase ground fault takes place in described distribution system, determine second information of the circuit of the described single phase ground fault of generation, described second information is sent to the described first single phase ground fault self-healing device 202, and receive the first information of the circuit of the described single phase ground fault of determining from the described first single phase ground fault self-healing device 202 of generation, the described first information and described second information are compared, whether the circuit of the described single phase ground fault of determining with the circuit of determining the described single phase ground fault of generation that the described second single phase ground fault self-healing device 204 is determined and the described first single phase ground fault self-healing device 202 of generation is the same line road, when described second information is identical with the described first information, determine that described circuit is the single phase ground fault circuit, when determining described single phase ground fault circuit, send switch actuating signals, make the interconnection switch closure of the load side of described single phase ground fault circuit, then, the service entrance switch of the load side of described single phase ground fault circuit is opened, made the switch opens of the mains side of described single phase ground fault circuit at last.
By technical scheme of the present invention, can detect single phase ground fault, determine to take place the circuit of single phase ground fault, when the isolated fault circuit, do not influence the power supply of load, satisfy the fault self-recovery requirement.
Because distribution line generally adopts the neutral non-effective grounding mode, specifically comprise: isolated neutral, neutral by arc extinction coil grounding and neutral point are through high resistance ground.System with non effectively earth ed neutral can not stop the user being powered when single phase ground fault takes place immediately.So whether technical scheme of the present invention as prerequisite, single phase ground fault has taken place in the real-time detecting system; After single phase ground fault takes place, carry out determining and the single phase ground fault isolation of single phase ground fault circuit successively, in isolation processes, do not influence the power supply of load, satisfy single phase ground fault self-healing requirement.The concrete principle that single phase ground fault detects, the single phase ground fault circuit is determined and single phase ground fault is isolated mentioned in the technical scheme of the present invention is as follows:
1. single phase ground fault detects
In system with non effectively earth ed neutral, when system normally moves, the three-phase voltage symmetry, residual voltage is zero.When single phase ground fault took place, the ground connection phase voltage reduced, and perfected phase voltage and raise, and residual voltage raises.When metallic earthing, the ground connection phase voltage is reduced to zero, perfects phase voltage and raises to line voltage, very big residual voltage occurs.
Therefore, based on these features of the voltage electric parameters in the distribution system, effectively in the decision-making system whether single phase ground fault has taken place, for example, can be based on the voltage transformer open delta side measuring voltage on the system busbar.When system normally moved, voltage transformer open delta side measuring voltage only was system's unbalance voltage; When system's generation single phase ground fault, the rising of voltage transformer open delta side measuring voltage is three times a phase voltage.
2. the single phase ground fault circuit is determined
System with non effectively earth ed neutral single phase ground fault circuit determines that method has many kinds, comprises that zero-sequence current determines that than width of cloth phase comparing method, transient state circuit method, harmonic wave circuit determine that method, external signal method and traveling wave line road determine method etc.Because the traveling wave line road is determined method and is not subjected to the influence of neutral grounding mode, system operation mode and transition resistance etc., so adopt the traveling wave line road to determine method in the technical scheme of the present invention.
When in the power distribution network single phase ground fault taking place, the fault point will produce fault traveling wave.According to EM theory, the fault traveling wave that the fault point produces will be propagated in system along faulty line.When fault traveling wave arrives the measurement point bus, catadioptric will take place in fault traveling wave at measurement point bus place, and non-fault line is advanced in a part of fault traveling wave transmission, a part of fault traveling wave reflected back faulty line.The initial row ripple that faulty line is experienced is the stack of incident row ripple and reflected traveling wave; And the initial row ripple that non-fault line is experienced is refraction row ripple.If the measurement point bus is regarded as a node, then according to Kirchhoff's current law (KCL), the electric current that the electric current of arbitrary moment inflow node equals to flow out, the electric current initial row ripple of faulty line is for flowing into the electric current of node, and the electric current initial row ripple of non-fault line is for flowing out the electric current of node.Therefore, the electric current initial row ripple of faulty line is greater than the electric current initial row ripple of non-fault line; Under same current reference direction, the electric current initial row ripple of faulty line is opposite with the initial polarity of traveling wave of the electric current of non-fault line.Therefore, based on the amplitude and the polar character of the electric current initial row ripple of circuit, can realize determining of one-phase earthing failure in electric distribution network circuit.
3. single phase ground fault is isolated
It is the core of single phase ground fault self-healing that single phase ground fault is isolated.The ground path Fault Isolation comprises that ground path mains side and load side two ends isolate from system.The isolation of traditional distribution system ground path is the circuit breaker of first deenergization side, opens the circuit breaker of load side again.The characteristics of this isolation mode are after the mains side circuit breaker is opened, and the load dead electricity can not satisfy the requirement of fault self-recovery.And single phase ground fault self Healing Technology of the present invention has proposed the interconnection switch of the load side of first closed faulty line, and then open the service entrance switch of the load side of faulty line, open the isolation scheme of switch of the mains side of faulty line at last, guarantee the not dead electricity of loading in the ground path isolation processes, satisfy the requirement of fault self-recovery.
According to the single phase ground fault of the above description detects, the single phase ground fault circuit is determined and single phase ground fault is isolated concrete principle as can be known, at first, the single-phase fault self-recovery device that connects that is installed on transformer station is monitored voltage on the bus of transformer station in the distribution system in real time, voltage and setting value are compared, judge whether single phase ground fault has taken place in the distribution system; After in the judgement system, single phase ground fault having taken place,, determine to take place the circuit of single-phase earthing respectively based on the amplitude polarity relativeness between the electric current in the outlet; And the single phase ground fault self-healing device that is installed on switching station has also determined to take place the circuit of single phase ground fault, determine the result by communication as the circuit of mutual two the single phase ground fault self-healing devices of cordless communication network, if two circuit is the same line road, then finally confirm the single phase ground fault circuit in the distribution system; After confirming the single phase ground fault circuit, the single phase ground fault self-healing device that is installed on transformer station sends switch actuating signals respectively with the single phase ground fault self-healing device that is installed on switching station.This switch actuating signals is specially: the interconnection switch of the closed single phase ground fault line load side of elder generation, and the assurance load side is powered from two ends in short-term; Then, open the service entrance switch of single phase ground fault line load side, realize the isolation of single phase ground fault line load side; Open the switch of single phase ground fault line electricity source at last, realize that the mains side of single phase ground fault circuit is isolated from system.
Introduced after the operation principle of each major part of the present invention, described technical scheme of the present invention in detail below in conjunction with accompanying drawing.
Fig. 3 shows the schematic diagram of power distribution network primary system according to an embodiment of the invention.
As shown in Figure 3, the power distribution network primary system of embodiments of the invention, there are two main transformers in transformer station 302: the 1# main transformer is that 35kv and 2# main transformer are 10kv, and next stage is a switching station 304.When this power distribution network primary system normally moves, the I section bus of transformer station 302 and II section bus fanout operation, bus connection switch B100 disconnects; The I section bus of switching station 304 and II section bus be fanout operation also, and bus connection switch B900 disconnects.The load of switching station 304 circuits both can also can be powered by circuit L123 by circuit L113 power supply.Single phase ground fault self-healing device of the present invention is applied to as shown in Figure 3 transformer station 302 and switching station 304 respectively, be installed on the single phase ground fault self-healing device of transformer station 302 and the single phase ground fault self-healing system of the embodiments of the invention of the single phase ground fault self-healing device formation that is installed on switching station 304, these two single phase ground fault self-healing devices can mutual communication, realize the information interaction of fault route, to determine the single phase ground fault circuit of distribution system.
Fig. 4 shows according to an embodiment of the invention, and single phase ground fault self-healing device carries out the flow chart that single phase ground fault detects.
Shown in Figure 4, step 402, fault detection module is carried out the monitoring of three-phase main-frequency voltage according to the voltage signal of voltage transformer collection to circuit, promptly monitors the three-phase voltage on the distribution system bus in real time, then three-phase voltage is carried out Fourier transform, and then obtain the three-phase voltage effective value.
Single phase ground fault has taken place in step 406 in the decision-making system.
After detecting distribution system generation single phase ground fault, need to determine that single phase ground fault has taken place which bar circuit, Fig. 5 has illustrated single phase ground fault self-healing device is how to determine the single phase ground fault circuit.
Fig. 5 shows the flow chart that single phase ground fault self-healing device is according to an embodiment of the invention determined the single phase ground fault circuit.
As shown in Figure 5, present embodiment carries out determining of single phase ground fault circuit based on zero mould current traveling wave.
After judging the single phase ground fault circuit of distribution system, need carry out the self-healing of single phase ground fault circuit, the core of technical scheme of the present invention is described below in conjunction with Fig. 6.
Fig. 6 shows the flow chart that single phase ground fault self-healing device according to an embodiment of the invention carries out Fault Isolation.
In Fig. 6, after judging the single phase ground fault circuit, the self-healing module of single phase ground fault self-healing device is sent switch actuating signals, step 602, at first, make the bus connection switch closure of single phase ground fault line load side, guarantee that this load can power from two ends in short-term.
Step 604 then, opens the service entrance switch of single phase ground fault line load side, isolates ground connection from load side.
Step 606 at last, makes the mains side switch opens of single phase ground fault circuit, isolates ground connection from mains side, is grounded circuit and isolates from distribution system.
The concrete scheme of the each several part in the technical scheme of the present invention more than has been described, technical scheme of the present invention intactly has been described below in conjunction with the single phase ground fault self-healing system.
Fig. 7 shows the flow chart that single phase ground fault self-healing system according to an embodiment of the invention carries out fault self-recovery.
In the single phase ground fault self-healing system, single phase ground fault self-healing device is installed on respectively in transformer station and the switching station, the job step of two single phase ground fault self-healings is consistent, is that example is explained concrete job step with the single phase ground fault self-healing device that is installed on transformer station.
As shown in Figure 7, step 702, the voltage on the bus of monitoring substation in real time.
Step 704 judges whether earth fault has taken place in the distribution system, when judged result for not the time, then get back to step 702, when judged result when being, then enter step 706.Concrete determination methods is: when the voltage rising of bus surpasses default setting value, in the decision-making system earth fault has taken place then, promptly ought satisfy any two phase voltages in the three-phase voltage greater than setting value 1, and remain one less than setting value 2, and setting value 1 is during greater than setting value 2, and then earth fault has taken place decision-making system.
Step 706 is monitored the capable ripple of zero-sequence current in real time.
Step 708 after in the decision-making system earth fault having taken place, is determined to take place the circuit of single phase ground fault according to the capable ripple of zero-sequence current of monitoring.
Step 712 is after receiving definite result of ground path, if definite unanimity as a result of the ground path of two single phase ground fault self-healing devices is then finally confirmed the ground path of distribution system.
Step 714 after ground path is confirmed, is at first sent closed ground path load side bus connection switch instruction, guarantees to load and powers from two ends in short-term.
Step 716 then after the bus connection switch closure, is sent the service entrance switch instruction of opening the ground path load side, makes load side isolate ground connection.
Step 718 is sent at last and is opened ground path mains side switch command, realizes single phase ground fault self-healing.
Below in conjunction with the accompanying drawings technical scheme of the present invention is had been described in detail, technical scheme of the present invention judges whether to take place earth fault based on the voltage on the bus of distribution system, after judging generation earth fault, select to take place the circuit of earth fault according to the current traveling wave in the outlet of distribution system, the exchange adjacent lines determines that definite result of the faulty line of device finally determines the single phase ground fault circuit of distribution system, send switch folding instruction then, make ground path load side bus connection switch closure earlier, then, the service entrance switch of ground path load side is opened, make ground path mains side switch opens at last, be implemented in when isolating ground path and make the not dead electricity of loading, satisfy the fault self-recovery requirement of distribution system.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a single phase ground fault self-healing device is characterized in that, is arranged in the transformer station or switching station of distribution system, comprising: fault detection module, faulty line determination module, communication module, judge module and self-healing module, wherein,
Described fault detection module receives the voltage that voltage transformer is gathered, and detects in real time whether single phase ground fault takes place in the described distribution system;
Described faulty line determination module when described fault detection module is determined described single phase ground fault takes place, according to the electric current that current transformer collects, is determined the first information of the circuit of the described single phase ground fault of generation;
Described communication module, the first information of the circuit of the described single phase ground fault of generation that described faulty line determination module is definite is sent to the outside, and from described outside second information that receives the circuit that described single phase ground fault takes place;
Described judge module, the described first information and described second information are compared, whether with the circuit of determining the described single phase ground fault of generation that described faulty line determination module is determined with from the circuit of the described single phase ground fault of generation of described outside is the same line road, when the described first information is identical with described second information, determine that described circuit is the single phase ground fault circuit; And
Described self-healing module, when described judge module is determined described single phase ground fault circuit, send switch actuating signals, make the interconnection switch closure of the load side of described single phase ground fault circuit, then, the service entrance switch of the load side of described single phase ground fault circuit is opened, made the switch opens of the mains side of described single phase ground fault circuit at last.
2. single phase ground fault self-healing device according to claim 1, it is characterized in that, described fault detection module detects the three-phase voltage of the bus of described transformer station or switching station in real time, described three-phase voltage and setting value are compared, to determine whether described distribution system described single phase ground fault takes place
Wherein, described setting value comprises first setting value and second setting value, described first setting value is greater than described second setting value, any two phase voltages are all greater than described first setting value in described three-phase voltage, residue one phase voltage in the described three-phase voltage is then judged described single phase ground fault is taken place during less than described second setting value.
3. single phase ground fault self-healing device according to claim 2 is characterized in that, described first setting value is 1.2 times a phase voltage, and described second setting value is 0.5 times a phase voltage.
4. according to each described single phase ground fault self-healing device in the claim 1 to 3, it is characterized in that described faulty line determination module is based on the definite circuit that described single phase ground fault takes place of relativeness of the relativeness and the polarity of the amplitude between the electric current in all outlets of described transformer station or described switching station.
5. single phase ground fault self-healing device according to claim 4 is characterized in that, described faulty line determination module comprises:
Data processing unit, be used for the current traveling wave in all outlets of the described transformer station that collects or described switching station is carried out wavelet transformation respectively to ask for wavelet conversion coefficient, the modulus maximum that extracts described wavelet conversion coefficient obtains the polarity and the amplitude Characteristics of described current traveling wave;
The circuit determining unit, the polarity and the amplitude Characteristics that are used for the described current traveling wave in relatively all outlets, to determine to take place the circuit of described single phase ground fault, wherein, it is maximum and that the polarity of current traveling wave of circuit of described single phase ground fault takes place is opposite with the polarity of the current traveling wave of non-earth fault line the amplitude of current traveling wave of circuit of described single phase ground fault to take place.
6. single phase ground fault self-healing device according to claim 5 is characterized in that, the wavelet function of described wavelet transformation is the single order derived function of cubic B-spline function, and described wavelet transformation is four layers of wavelet transformation.
7. according to claim 5 or 6 described single phase ground fault self-healing devices, it is characterized in that the sample frequency of described current traveling wave is 1 megahertz, length is 128 microseconds during data window.
8. single phase ground fault self-healing system, it is characterized in that, comprise: in the transformer station of distribution system, be provided with as each described first single phase ground fault self-healing device in the claim 1 to 7, in the switching station of described distribution system, be provided with as right and will remove each described second single phase ground fault self-healing device in 1 to 7, wherein
The described first single phase ground fault self-healing device, detect described distribution system whether single phase ground fault takes place, when described single phase ground fault takes place in described distribution system, determine the first information of the circuit of the described single phase ground fault of generation, the described first information is sent to the described second single phase ground fault self-healing device, and reception is from second information of the circuit of the definite described single phase ground fault of generation of the described second single phase ground fault self-healing device, the described first information and described second information are compared, whether the circuit of the described single phase ground fault of determining with the circuit of determining the described single phase ground fault of generation that the described first single phase ground fault self-healing device is determined and the described second single phase ground fault self-healing device of generation is the same line road, when the described first information is identical with described second information, determine that described circuit is the single phase ground fault circuit, when determining described single phase ground fault circuit, send switch actuating signals, make the interconnection switch closure of the load side of described single phase ground fault circuit, then, the service entrance switch of the load side of described single phase ground fault circuit is opened, made the switch opens of the mains side of described single phase ground fault circuit at last;
The described second single phase ground fault self-healing device, detect described distribution system whether described single phase ground fault takes place, when described single phase ground fault takes place in described distribution system, determine second information of the circuit of the described single phase ground fault of generation, described second information is sent to the described first single phase ground fault self-healing device, and reception is from the first information of the circuit of the definite described single phase ground fault of generation of the described first single phase ground fault self-healing device, the described first information and described second information are compared, whether the circuit of the described single phase ground fault of determining with the circuit of determining the described single phase ground fault of generation that the described second single phase ground fault self-healing device is determined and the described first single phase ground fault self-healing device of generation is the same line road, when described second information is identical with the described first information, determine that described circuit is the single phase ground fault circuit, when determining described single phase ground fault circuit, send switch actuating signals, make the interconnection switch closure of the load side of described single phase ground fault circuit, then, the service entrance switch of the load side of described single phase ground fault circuit is opened, made the switch opens of the mains side of described single phase ground fault circuit at last.
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| CN111130071A (en) * | 2019-12-23 | 2020-05-08 | 贵州电网有限责任公司 | Ground fault self-healing system suitable for low current grounding system |
| CN112255571A (en) * | 2020-10-29 | 2021-01-22 | 国网江苏省电力有限公司盐城供电分公司 | Earth fault detection system with neutral point indirectly grounded |
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