CN201532430U - Distribution circuit fault route selecting apparatus for arc-suppression coil grounding system through neutral points - Google Patents

Distribution circuit fault route selecting apparatus for arc-suppression coil grounding system through neutral points Download PDF

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Publication number
CN201532430U
CN201532430U CN2009202461702U CN200920246170U CN201532430U CN 201532430 U CN201532430 U CN 201532430U CN 2009202461702 U CN2009202461702 U CN 2009202461702U CN 200920246170 U CN200920246170 U CN 200920246170U CN 201532430 U CN201532430 U CN 201532430U
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China
Prior art keywords
voltage signal
result
data acquisition
analog voltage
neutral
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Expired - Lifetime
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CN2009202461702U
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Chinese (zh)
Inventor
李世伟
王利平
朱建军
李成学
纪青春
黄承源
张小勇
李勇
董新洲
杨建明
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Beijing Hengtianbeidou Technology Co ltd
GANSU ELECTRIC POWER CO Ltd LANZHOU POWER SUPPLY CO Ltd
Tsinghua University
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Beijing Hengtianbeidou Technology Co ltd
GANSU ELECTRIC POWER CO Ltd LANZHOU POWER SUPPLY CO Ltd
Tsinghua University
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Abstract

The utility model provides a distribution circuit fault route selecting apparatus, including: a converter, connected to a zero-sequence current transformer for converting the great current into a analog voltage signal and outputting the first analog voltage signal to the data sampler, and connected to a voltage mutual inductor fro converting the high voltage into a second analog voltage signal and outputting the second analog voltage signal to the analog voltage signal, wherein the voltage of the analog voltage signal is less than or equal to the destined threshold; a data sampler, for converting the analog voltage signal come from the converter into a digital voltage signal, and storing in a data memory, and outputting to a central processing unit after fault takes place; a central processing unit, processing data come from the data sampler, executing the faulty line determination, and outputting the determination result to the result output interface; and a result output interface, for outputting the determination result from the central processing unit. By the technical scheme, fault circuit can be accurately and quickly selected.

Description

Neutral by arc extinction coil grounding system distribution line failure line selection apparatus
Technical field
The utility model relates to the Power System Faults Detection technical field, relates in particular to neutral by arc extinction coil grounding system distribution line failure line selection apparatus.
Background technology
During neutral by arc extinction coil grounding system generation singlephase earth fault,, has only the little capacitance current of numerical value because the existence of arc suppression coil can not form effective short-circuit loop, so short-circuit current is little.
Although do not form effective short-circuit loop, the fault ground electric current is also little,, this situation can not long-term existence.Non-fault phase voltage can raise on the one hand, and line insulation is threatened; The flame current of earth point can burn out circuit on the other hand, causes the circuit permanent damages.So China's operation power rules regulation: the neutral by arc extinction coil grounding system single-phase earth fault duration must not surpass 2 hours, and faulty line must withdraw from from electrical network in 2 hours.Therefore, be the problem of ground path with regard to having proposed which bar circuit---be that faulty line is selected problem.
Around this problem, carried out a large amount of research both at home and abroad, also developed many devices, such as power frequency zero-sequence current amplitude, phase place route selection method.But power frequency zero-sequence current numerical value is little, and the uneven zero-sequence current when being difficult to normal operation is distinguished mutually, so in the rig-site utilization, can't correctly select fault wire.Rig-site utilization shows: do not have a kind of device can fundamentally solve neutral by arc extinction coil grounding system single-phase earth fault circuit up to now and select problem.
The utility model content
The purpose of this utility model is to change to use the inaccurate present situation of power frequency electric parameters failure line selection, proposes a kind of device that neutral by arc extinction coil grounding system single-phase earth fault circuit is selected problem that is expected to fundamentally solve.The utility model adopts the transient state travelling wave electric current that produces after the fault to select faulty line.When singlephase earth fault takes place, the transient state initial row ripple current amplitude maximum of faulty line, polarity is opposite with non-fault line.Because the row ripple is only relevant with the equipment on its travel path, and the capable ripple of initial current is to arrive measurement point earlier, arrive neutral point again, so it is irrelevant to measure the capable ripple of initial current and neutral grounding mode on the circuit: therefore utilize the fault line selection device of row ripple can fundamentally solve neutral by arc extinction coil grounding system failure line options problem.
The utility model provides a kind of neutral by arc extinction coil grounding system distribution line failure line selection apparatus, comprise: transducer, be connected with zero sequence current mutual inductor, to change first analog voltage signal into from the big electrorheological of described zero sequence current mutual inductor, and described first analog voltage signal will be exported to data acquisition; Link to each other with voltage transformer (VT), to change second analog voltage signal from the high-voltage variable of described voltage transformer (VT) into, and described second analog voltage signal exported to described data acquisition unit, the magnitude of voltage of described first analog voltage signal and described second analog voltage signal all is less than or equal to predetermined threshold; Described data acquisition unit, be used for and convert described first digital voltage signal and described second digital voltage signal respectively to from described first analog voltage signal and described second analog voltage signal of described transducer, and be stored in the data-carrier store, after taking place, fault exports to central processing unit; Described central processing unit is used to handle the data from described data acquisition unit, carries out faulty line and judges, and judged result is exported to output interface as a result, by the described output of output interface as a result; Described output interface as a result is used for the described judged result output from described central processing unit is shown by LCD screen, and by communication port the result is uploaded to control system.
Preferably, described predetermined threshold is 5 volts.
Preferably, described central processing unit adopts the wavelet transformation analysis travelling wave signal, extracts travelling wave signal amplitude Characteristics and polarity, and will go the wave amplitude maximum, and the circuit that polarity is opposite with All other routes is chosen as faulty line.
Preferably, described central processing unit judges in conjunction with voltage signal whether system fault has taken place, if fault has taken place, the result is exported to output interface plate as a result.
Preferably, described data acquisition unit comprises hardware-initiated unit of earth fault and data acquisition unit.The hardware-initiated unit of described earth fault is used for comparison input current and threshold value, if the component of the preset frequency in the described input current reaches described threshold value, then output low level in the judgement system ground connection has been taken place.
Preferably, described data acquisition unit comprises: multicircuit switch, high-speed A/D converter and data-carrier store.
Preferably, described central processing unit carries out Filtering Processing and wavelet conversion to the transient current from described data acquisition unit to be handled, the failure judgement circuit, and the result exported to described output interface as a result.And failure logging is uploaded distant place control system by communication port.
Preferably, further comprise power supply, be used to described transducer, described data acquisition unit, described central processing unit, the power supply of described output interface as a result.
Preferably, the described data acquisition unit image data constantly that circulates behind the hardware-initiated unit starting of described earth fault, reads 128 sampled points of the capable wave datum of zero-sequence current on every loop line road from cyclic store.
The utility model also provides a kind of neutral by arc extinction coil grounding system distribution line failure line selection apparatus, comprising:
Converter plate, the secondary side of it and zero sequence current mutual inductor links, and the big electrorheological that will come from zero sequence current mutual inductor changes 5 volts voltage signal into, and this voltage signal is exported to data acquisition board.
Data acquisition board: it converts the analog voltage signal from converter plate to digital signal, and is stored in the data-carrier store, and fault is exported to the central processing unit plate after taking place; Institute's data acquisition board of carrying is gathered current traveling wave.
The central processing unit plate: it handles the data from data acquisition board, carries out faulty line and judges, and judged result is exported to output interface plate output as a result; Institute's central processing unit plate of carrying adopts the wavelet transformation analysis travelling wave signal, extracts travelling wave signal amplitude Characteristics and polarity, and will go the wave amplitude maximum, and the circuit that polarity is opposite with All other routes is chosen as faulty line.
Output interface plate as a result: this plank shows the result's output from the central processing unit plate, and by communication port failure logging is uploaded distant place control system by LCD screen.
Power panel: for package unit provides working power.
Adopt technique scheme, can realize following technique effect:
1, can accurately select faulty line;
2, can select faulty line fast, take place from earth fault, be selected to faulty line, the time is no more than 2 cycles;
3, can monitor 3 sections buses simultaneously, 24 loop line roads.
Description of drawings
Fig. 1 shows the block diagram according to the distribution line failure line selection apparatus of an embodiment of the present utility model;
Fig. 2 shows the structural drawing according to the low-current ground fault line selection device of an embodiment of the present utility model;
Fig. 3 shows the block diagram according to the data acquisition unit that is adopted among the embodiment of the present utility model; And
Fig. 4 shows the block diagram according to the central processing unit that is adopted among the embodiment of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, specifically describe the utility model.
Fig. 1 shows the block diagram according to the distribution line failure line selection apparatus of an embodiment of the present utility model.
The distribution line failure line selection apparatus 100 that is used for the neutral by arc extinction coil grounding system comprises transducer 102, data acquisition unit 104, central processing unit 106 and output interface 108 as a result.Transducer 102 is connected with zero sequence current mutual inductor 1022, will change first analog voltage signal into from the big electrorheological of described zero sequence current mutual inductor 1022, and described first analog voltage signal is exported to data acquisition.Transducer 102 links to each other with voltage transformer (VT) 1024 simultaneously, to change second analog voltage signal from the high-voltage variable of described voltage transformer (VT) 1024 into, and described second analog voltage signal exported to described data acquisition unit 104, the magnitude of voltage of described first analog voltage signal and described second analog voltage signal all is less than or equal to predetermined threshold.Data acquisition unit 104 is used for converting described first analog voltage signal and described second analog voltage signal from described transducer to described first digital voltage signal and described second digital voltage signal respectively, and be stored in the data-carrier store, after taking place, fault exports to central processing unit 106.Central processing unit is used to handle the data from described data acquisition unit 104, carries out faulty line and judges, and judged result is exported to output interface 108 as a result, by described 108 outputs of output interface as a result.Output interface 108 is used for the described judged result output from described central processing unit 106 is shown by LCD screen, and by communication port the result is uploaded to control system as a result.Preferably, described predetermined threshold is 5 volts.Preferably, described central processing unit adopts the wavelet transformation analysis travelling wave signal, extracts travelling wave signal amplitude Characteristics and polarity, and will go the wave amplitude maximum, and the circuit that polarity is opposite with All other routes is chosen as faulty line.
Preferably, described central processing unit 106 judges in conjunction with voltage signal whether system fault has taken place, if fault has taken place, the result is exported to output interface 108 as a result.
Preferably, described data acquisition unit 104 comprises hardware-initiated unit 1042 of earth fault and data acquisition unit 1044.The hardware-initiated unit 1042 of described earth fault is used for comparison input current and threshold value, if the component of the preset frequency in the described input current reaches described threshold value, then output low level in the judgement system ground connection has been taken place.
Preferably, described data acquisition unit 1044 comprises multicircuit switch, high-speed A/D converter and data-carrier store.
Preferably, 106 pairs of transient currents from described data acquisition unit of described central processing unit carry out Filtering Processing and wavelet conversion to be handled, the failure judgement circuit, and the result exported to described output interface as a result.And failure logging is uploaded distant place control system by communication port.
Preferably, distribution line failure line selection apparatus 100 further comprises power supply 110, is used to described transducer 102, described data acquisition unit 104, described central processing unit 106,108 power supplies of described output interface as a result.
Preferably, described data acquisition unit 104 image data constantly that circulates behind the hardware-initiated unit starting of described earth fault, reads 128 sampled points of the capable wave datum of zero-sequence current on every loop line road from cyclic store.
Fig. 2 shows the structural drawing according to the low-current ground fault line selection device of an embodiment of the present utility model.
This low-current ground fault line selection device comprises (not shown) such as interface board 208, power panel 210 and power panel, hummer, the LCD screen of converter plate 202, data acquisition board 204, central processing unit plate 206, result's output, as shown in Figure 2.
The composition of each plank be connected as follows:
1. converter plate: be transformed into 5 volts of following voltage signals the electric current that comes from the electric system current transformer is proportional; Be transformed into 5 volts of following voltage signals the voltage that comes from the power system voltage mutual inductor is proportional.Every block of plate can connect 8 road current signals, 1 road voltage signal; Configurable 3 converter plate in one table apparatus.The 5 volt following voltage signals of converter plate after with conversion offer data acquisition board and use.
2. data acquisition board: its converts all 5 volts of analog voltage signals that come from converter plate 21 to digital signal, and is stored in the data-carrier store.
This plank is made up of two unit: hardware-initiated unit I of earth fault and data acquisition unit II, and as Fig. 3.
Wherein:
Hardware-initiated unit is an input current and a threshold value (definite value) relatively, if when the 3~10Khz transient state component in the input current reaches threshold value, and the comparer output low level.Ground connection has been taken place in the judgement system.
Data acquisition unit is made up of multicircuit switch, high-speed AD converter chip, data-carrier store and correspondent control circuits.(analog to digital conversion) all road current data are ceaselessly gathered in the high-speed AD converter circulation, and store in the data-carrier store.
8 AD803 that the analog to digital converter chip adopts AD company to produce, the AD9300 that 8 multi-way switchs (each multi-way switch is connected four tunnel simulating signal timesharing to 8 AD) adopt the said firm to produce.The loop-around data storer adopts dual port RAM.
3. central processing unit plate: its carries out Filtering Processing and wavelet transform process to the transient current travelling waves data that come from data acquisition board, the failure judgement circuit, and the result exported to output interface plate as a result, as Fig. 4.
This plate is made up of DSP chip and correspondent peripheral circuit.It mainly carries out wavelet transform process, obtains the current traveling wave amplitude and the polar character of all line attachments, and will go the wave amplitude maximum, and the circuit that polarity is opposite with All other routes is chosen as faulty line.
Digital signal processor adopts the TMS320C32 DSP chip of TI company.Among Fig. 3, RAM is a data-carrier store, and Flash is a program storage.16D, 32D represent 16 or 32 s' data bus or program bus respectively.
4. output interface plate as a result: this plank is coming from the output of central processing unit result of calculation: show by LCD screen, and be uploaded to the control system in a distant place by communication port.
5. power panel: the working power of package unit is provided, and power module adopts the Shanghai weighing apparatus to inspire confidence in the Switching Power Supply that Industrial Co., Ltd. produces.
The course of work according to the technical solution of the utility model is as follows:
If one single-phase earthing has taken place circuit, this device will start, and its course of work is as follows:
1. by being installed on the zero sequence current mutual inductor on every loop line road, the zero-sequence current on every loop line road (can reach the electric current on 24 loop line roads) is introduced into converter plate;
2. each current-to-voltage converter changes the electrorheological that comes from current transformer into below 5 volts analog voltage signal;
3. the start unit of data acquisition board front detects the disturbance generation, hardware-initiated unit starting, output triggering level;
4. the data acquisition board continuous image data that circulates, hardware-initiated element reads 128 sampled points of the capable wave datum of zero-sequence current on every loop line road after starting from cyclic store;
5. these every time 128 capable wave datum that reach 24 times are carried out wavelet transformation;
According to every loop line road correspondence the wavelet transformation eigenwert, relatively select faulty line;
7. each voltage changer becomes voltage signal below 5 volts to the voltage transformation that comes from voltage transformer (VT), and with setting valve relatively, judge whether system fault has taken place.If measured value greater than setting valve, outputs to output board as a result to selection result;
8. output board is presented at the result on the device LCD screen on the one hand as a result; By communication port, fail result is uploaded to control system on the other hand, notifies the operations staff.
Adopt technique scheme, can realize following technique effect:
1, can accurately select faulty line;
2, can select faulty line fast, take place from earth fault, be selected to faulty line, the time is no more than 2 cycles;
3, can monitor 3 sections buses simultaneously, 24 loop line roads.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims (10)

1. a neutral by arc extinction coil grounding system distribution line failure line selection apparatus is characterized in that, comprising:
Transducer is connected with zero sequence current mutual inductor, will change first analog voltage signal into from the big electrorheological of described zero sequence current mutual inductor, and described first analog voltage signal is exported to data acquisition; Link to each other with voltage transformer (VT), to change second analog voltage signal from the high-voltage variable of described voltage transformer (VT) into, and described second analog voltage signal exported to described data acquisition unit, the magnitude of voltage of described first analog voltage signal and described second analog voltage signal all is less than or equal to predetermined threshold;
Described data acquisition unit, be used for and convert described first digital voltage signal and described second digital voltage signal respectively to from described first analog voltage signal and described second analog voltage signal of described transducer, and be stored in the data-carrier store, after taking place, fault exports to central processing unit;
Described central processing unit is used to handle the data from described data acquisition unit, carries out faulty line and judges, and judged result is exported to output interface as a result, by the described output of output interface as a result;
Described output interface as a result is used for the described judged result output from described central processing unit is shown by LCD screen, and by communication port the result is uploaded to control system.
2. neutral by arc extinction coil grounding according to claim 1 system distribution line failure line selection apparatus is characterized in that described predetermined threshold is 5 volts.
3. neutral by arc extinction coil grounding according to claim 1 and 2 system distribution line failure line selection apparatus, it is characterized in that, described central processing unit adopts the wavelet transformation analysis travelling wave signal, extract travelling wave signal amplitude Characteristics and polarity, and will go the wave amplitude maximum, the circuit that polarity is opposite with All other routes is chosen as faulty line.
4. neutral by arc extinction coil grounding according to claim 3 system distribution line failure line selection apparatus, it is characterized in that, described central processing unit judges in conjunction with voltage signal whether system fault has taken place, if fault has taken place, the result is exported to output interface as a result.
5. neutral by arc extinction coil grounding according to claim 1 and 2 system distribution line failure line selection apparatus is characterized in that described data acquisition unit comprises hardware-initiated unit of earth fault and data acquisition unit.
6. neutral by arc extinction coil grounding according to claim 5 system distribution line failure line selection apparatus, it is characterized in that, the hardware-initiated unit of described earth fault is used for comparison input current and threshold value, if the component of the preset frequency in the described input current reaches described threshold value, then ground connection has taken place in the judgement system in output low level.
7. neutral by arc extinction coil grounding according to claim 5 system distribution line failure line selection apparatus is characterized in that described data acquisition unit comprises: multicircuit switch, high-speed A/D converter and data-carrier store.
8. neutral by arc extinction coil grounding according to claim 1 and 2 system distribution line failure line selection apparatus, it is characterized in that, transient current from described data acquisition unit is carried out Filtering Processing with described central processing unit and wavelet conversion is handled, the failure judgement circuit, and the result exported to described output interface as a result.
9. neutral by arc extinction coil grounding according to claim 1 and 2 system distribution line failure line selection apparatus, it is characterized in that, further comprise power supply, be used to described transducer, described data acquisition unit, described central processing unit, the power supply of described output interface as a result.
10. neutral by arc extinction coil grounding according to claim 5 system distribution line failure line selection apparatus, it is characterized in that, the described data acquisition unit image data constantly that circulates, behind the hardware-initiated unit starting of described earth fault, from cyclic store, read 128 sampled points of the capable wave datum of zero-sequence current on every loop line road.
CN2009202461702U 2009-10-30 2009-10-30 Distribution circuit fault route selecting apparatus for arc-suppression coil grounding system through neutral points Expired - Lifetime CN201532430U (en)

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CN102280866A (en) * 2011-02-10 2011-12-14 清华大学 Traveling wave data acquisition and processing device
CN102540015A (en) * 2012-01-11 2012-07-04 清华大学 Distance measuring method and distance measuring device for single-phase grounding of low-current grounding system
CN101719662B (en) * 2009-11-06 2012-08-08 北京衡天北斗科技有限公司 Fault line selection device for distribution line of small-current grounding system
CN103123389A (en) * 2011-11-21 2013-05-29 甘肃省电力公司定西供电公司 Method for verifying polarity of zero-sequence current transformer
CN103840556A (en) * 2014-03-25 2014-06-04 清华大学 Method for sharing multi-interval transient traveling wave signals of intelligent substation in real time
CN104614638A (en) * 2014-12-24 2015-05-13 国家电网公司 Grounding line selection method for small current system
CN105223469A (en) * 2015-09-30 2016-01-06 国网浙江省电力公司绍兴供电公司 A kind of line-selected earthing device being applicable to intelligent substation
CN108957248A (en) * 2018-10-09 2018-12-07 国网河南省电力公司洛阳供电公司 A kind of positioning of power distribution network primary fault and method for early warning
CN109142968A (en) * 2018-07-18 2019-01-04 国网湖北省电力有限公司武汉供电公司 A kind of fault line selection for indirectly grounding power system method compared based on stable status zero-sequence current
CN111007427A (en) * 2019-11-23 2020-04-14 清华大学 Distribution line single-phase earth fault line selection method and computer readable storage medium
CN111624440A (en) * 2020-05-26 2020-09-04 襄阳科能机电设备有限公司 Single phase grounding fault line selection device in neutral point through arc suppression coil grounding system
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CN101719662B (en) * 2009-11-06 2012-08-08 北京衡天北斗科技有限公司 Fault line selection device for distribution line of small-current grounding system
CN102280866A (en) * 2011-02-10 2011-12-14 清华大学 Traveling wave data acquisition and processing device
CN103123389A (en) * 2011-11-21 2013-05-29 甘肃省电力公司定西供电公司 Method for verifying polarity of zero-sequence current transformer
CN102540015A (en) * 2012-01-11 2012-07-04 清华大学 Distance measuring method and distance measuring device for single-phase grounding of low-current grounding system
CN102540015B (en) * 2012-01-11 2015-07-29 清华大学 Single-phase earthing of small current earthing system distance-finding method and distance measuring equipment
CN103840556A (en) * 2014-03-25 2014-06-04 清华大学 Method for sharing multi-interval transient traveling wave signals of intelligent substation in real time
CN103840556B (en) * 2014-03-25 2015-10-28 清华大学 Intelligent substation multi-compartment transient state travelling wave signal Real-Time Sharing method
CN104614638A (en) * 2014-12-24 2015-05-13 国家电网公司 Grounding line selection method for small current system
CN105223469A (en) * 2015-09-30 2016-01-06 国网浙江省电力公司绍兴供电公司 A kind of line-selected earthing device being applicable to intelligent substation
CN109142968A (en) * 2018-07-18 2019-01-04 国网湖北省电力有限公司武汉供电公司 A kind of fault line selection for indirectly grounding power system method compared based on stable status zero-sequence current
CN108957248A (en) * 2018-10-09 2018-12-07 国网河南省电力公司洛阳供电公司 A kind of positioning of power distribution network primary fault and method for early warning
CN111007427A (en) * 2019-11-23 2020-04-14 清华大学 Distribution line single-phase earth fault line selection method and computer readable storage medium
CN111007427B (en) * 2019-11-23 2021-05-04 清华大学 Distribution line single-phase earth fault line selection method and computer readable storage medium
JP2021081400A (en) * 2019-11-23 2021-05-27 清華大学Tsinghua University Line selection method of one-phase ground fault of distribution line and storage medium capable of performing computer-reading
CN111624440A (en) * 2020-05-26 2020-09-04 襄阳科能机电设备有限公司 Single phase grounding fault line selection device in neutral point through arc suppression coil grounding system
CN113270942A (en) * 2021-05-28 2021-08-17 国网湖南省电力有限公司 Intelligent monitoring device and method for operating state of arc suppression coil

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