CN103941079A - On-line monitoring and fault diagnosis system for power distribution network PT - Google Patents
On-line monitoring and fault diagnosis system for power distribution network PT Download PDFInfo
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Abstract
Provided is an on-line monitoring and fault diagnosis system for a power distribution network PT. The system can be used for measuring three phase currents, three phase voltages, three line voltages and zero sequence voltage data of the power distribution network PT. Whether the system has a single-phase grounding fault, a ferromagnetic resonance fault and a PT line breakage fault can be accurately judged through actually-measured data. The system is composed of a current measurement terminal, a collector and a background server. The current measurement terminal is arranged on a three-phase line of the power distribution network PT, and the three phase currents of the power distribution network PT are measured according to the electromagnetic induction principle. The collector is arranged on a panel of a PT cabinet, receives data of the terminal, meanwhile, measures the phase voltages, the line voltages and a zero sequence voltage of the PT, and uploads the data to the background server. The background server is arranged inside a transformer substation, receives the data of the collector, and conducts on-line monitoring and fault diagnosis on the power distribution network PT. According to the on-line monitoring and fault diagnosis system for the power distribution network PT, technology is mature, and reliability is high.
Description
Technical field
The invention belongs to electric power monitoring technical field, be specifically related to a kind of power equipment, be applicable to 3～35kV power distribution network.Voltage and current that can on-line monitoring PT three-phase, can accurately judge by measured data whether system singlephase earth fault, ferroresonance fault, PT disconnection fault occur based on rough set theory.
Background technology
Easily there is singlephase earth fault, ferroresonance fault, PT disconnection fault in China 3～35kV power distribution network.Because the phenomenon of these several faults is very similar, operations staff can only rule of thumb analyze, and is often difficult to the Accurate Diagnosis type that is out of order, if operations staff's error in judgement take wrong operation likely causes fault to expand.
For analytic system fault type more accurately, on-the-spotly in the urgent need to practical technology, PT is carried out to on-line monitoring and fault diagonosing.Because PT there will be multi-frequency under ferroresonance failure condition, therefore in measuring process, to consider especially the compatibility issue of frequency measurement technology.
Summary of the invention
The object of the invention is to overcome the deficiency in prior art, propose a kind of power distribution network PT on-line monitoring and fault diagnosis system.This system can be measured three phase currents of power distribution network PT, three phase voltages, three line voltage and residual voltage data in real time, exactly.This system can accurately judge by measured data whether system singlephase earth fault, ferroresonance fault, PT disconnection fault occur.This system can provide accurate instruction for operations staff.
Technical scheme of the present invention is as follows:
A kind of power distribution network PT on-line monitoring and fault diagnosis system, be made up of terminal, collector, three parts of background server, it is characterized by:
Described terminal is arranged on power distribution network PT three-phase line, utilizes electromagnetic induction principle to measure the electric current of the three-phase of power distribution network PT, low power consumption CPU module and radio-frequency communication module that terminal comprises built-in AD function;
Described collector is arranged on the panel of PT cabinet, the current data of the three-phase of the measured power distribution network PT of receiving terminal, measure phase voltage, line voltage and the residual voltage of PT simultaneously, more described current data, phase voltage, line voltage and residual voltage data upload are arrived to background server;
Described background server is arranged in transformer station, has optical fiber communication module, receives the data of collector, and power distribution network PT is carried out to on-line monitoring and fault diagnosis.
Described terminal adopts amplifying circuit and high accurate A/D chip, can measure the electric current of 10-1000mA.
Described terminal can be measured the frequency of 25-250Hz scope, can measure accurately Subharmonic Resonance, fundamental resonance and frequency multiplication resonance.
Described collector comprises voltage changer, voltage measurement module, radio-frequency communication module and optical fiber communication module.Radio-frequency communication module is connected with optical fiber communication module, the data of radio-frequency communication module receiving terminal, and send to optical fiber communication module by serial communication mode.PT phase voltage, line voltage and residual voltage are converted to respectively digital quantity by voltage changer and voltage measurement module, and send to optical fiber communication module by serial communication mode.Optical fiber communication module sends to voltage, current data the background server that is positioned at transformer station.Each collector receives only the terminal data at own interval, and measures the voltage at own interval.
Disclosed herein as well is a kind of diagnostic method based on aforementioned power distribution network PT on-line monitoring and fault diagnosis system, it is characterized in that, said method comprising the steps of:
(1) utilize rough set theory to set up the decision table of power distribution network PT fault diagnosis, specifically comprise singlephase earth fault decision table, ferroresonance Decision Table for Fault, PT disconnection fault decision table;
(2) three phase currents of PT, three phase voltages, three line voltage and residual voltage data are carried out to discretize processing, formation condition property value;
(3) PT voltage, current condition property value are inquired about in above-mentioned four kinds of decision tables, obtained corresponding decision attribute, i.e. diagnostic result;
(4) if judgement is broken down, send immediately warning.
The application can realize following functions:
(1) three of Measurement accuracy PT phase currents, three phase voltages, three line voltage and residual voltage data.
(2) utilize rough set theory to set up the decision table of power distribution network PT fault diagnosis, specifically comprise singlephase earth fault decision table, ferroresonance Decision Table for Fault, PT disconnection fault decision table.Utilize decision table to realize fault diagnosis.
Advantage of the present invention is as follows:
1, can utilize measured current voltage data to diagnose fault type.
2, the operation conditions of Real-Time Monitoring PT, occur when abnormal can and alarm.
3, measuring accuracy is high.
4, low in energy consumption, meet the requirement of long-time running.
5, technology maturation, reliability are high, are applicable to 3～35kV distribution system.
Brief description of the drawings
Fig. 1 is on-line monitoring of the present invention and fault diagnosis system structural representation;
Fig. 2 is the schematic diagram of terminal 101;
Fig. 3 is the schematic diagram of collector 102;
Fig. 4 is the Troubleshooting Flowchart based on rough set;
Wherein 101 is terminal, and 101-A, 101-B, 101-C represent to be arranged on the terminal on PT three-phase line, and 102 is collector, 103 is background server, and 104 is substation bus bar, and 105 is radio communication, 106 is cable, 107 is optical fiber communication, and 201 is inductive coil, and 202 is temperature measurement module, 203 is radio-frequency communication module, 303 is optical fiber communication module, and 304 is voltage changer, and 305 is voltage measurement module.
Embodiment
Below in conjunction with Figure of description, by specific embodiment, technical scheme of the present invention is described in further detail.
The application discloses a kind of power distribution network PT on-line monitoring and fault diagnosis system, and this system can be measured three phase currents of power distribution network PT, three phase voltages, three line voltage and residual voltage data.Can accurately judge by measured data whether system singlephase earth fault, ferroresonance fault, PT disconnection fault occur.System is made up of current measurement terminal, collector, three parts of background server.Described current measurement terminal is arranged on power distribution network PT three-phase line, utilizes electromagnetic induction principle to measure the three-phase current of power distribution network PT.Described collector is arranged on the panel of PT cabinet, and the data of receiving terminal are measured phase voltage, line voltage and the residual voltage of PT simultaneously, then data upload is arrived to background server.Described background server is arranged in transformer station, receives the data of collector, and power distribution network PT is carried out to on-line monitoring and fault diagnosis.
As shown in Figure 1, system is made up of terminal 101, collector 102 and 103 3 parts of background server structure of the present invention.101-A, 101-B, 101-C represent to be arranged on the terminal on PT three-phase line, and 102 represent to be arranged on the collector on PT cabinet panel.Terminal 101 and collector 102 are all low-power-consumption embedded microcomputer type device, adopt radio communication 105 modes to carry out data transmission between terminal 101 and collector 102.Collector 102, except the data of receiving terminal 101, can also be measured PT phase voltage, line voltage and residual voltage.103 represent background server, are an industrial control computer, are installed in transformer station, for receiving the data of collector 102 and carrying out analytical calculation.
The principle of terminal as shown in Figure 2, terminal 101 is socketed on power distribution network PT three-phase line, 201 represent inductive coils, by electromagnetic induction can the secondary acquisition-5V of inductive coil 201 and+low-voltage simulation amount signal between 5V, this voltage signal is directly proportional to the electric current of power distribution network PT.First analog quantity voltage signal carries out low-pass filtering after entering mainboard, then after AD conversion, become digital signal, digital signal sends CPU to by data bus and calculates, CPU calculates voltage effective value and frequency to digital signal, and then converts out corresponding power distribution network PT current effective value and frequency.202 represent temperature measurement module, and being used for temperature inversion is level signal, give CPU calculate by IO oral instructions.203 represent radio-frequency communication module, and CPU sends to radio-frequency communication module 203 by data bus by electric current and temperature data, by radio communication 105, the current effective value of power distribution network PT is uploaded to collector 102.
The principle of collector as shown in Figure 3, the data that radio-frequency communication module 203 is uploaded for receiving terminal 101.303 represent optical fiber communication modules, for by data upload to background server 103.Between radio-frequency communication module 203 and optical fiber communication module 303, carry out data transmission by 232 serial ports.304 represent voltage changer, and the input end of voltage changer is connected to PT secondary side by cable 106, and the output terminal of voltage changer is connected with the input end of voltage measurement module, PT secondary voltage can be transformed to 5V with interior low-voltage.305 is voltage measurement module, and the output terminal of voltage measurement module 305 is connected to optical fiber communication module 303, PT phase voltage, line voltage and residual voltage is converted to respectively to digital quantity, and sends to optical fiber communication module 303 by serial communication mode.Optical fiber communication module 303 sends to phase voltage, line voltage and residual voltage, current data the background server 103 that is positioned at transformer station.
If Fig. 4 is power distribution network PT inline diagnosis method flow diagram, diagnostic method comprises the following steps:
(1) utilize rough set theory to set up the decision table of power distribution network PT fault diagnosis, specifically comprise singlephase earth fault decision table, ferroresonance Decision Table for Fault, PT disconnection fault decision table, singlephase earth fault decision table is as shown in table 1, singlephase earth fault decision table specific object is as follows, { Ua, Ub, Uc} is three phase voltage conditional attributes, { Uab, Uac, Ubc} is three line voltage conditions attributes, { Ia, Ib, Ic} is three phase current conditional attributes, U0 represents residual voltage conditional attribute, " 1 " represents the out-of-limit rising of conditional attribute value, it is out-of-limit that " 1 " represents that conditional attribute value reduces, " 0 " represents that conditional attribute value is in normal range.{ Fault} is decision attribute, and " JD " represents system generation singlephase earth fault.Ferroresonance Decision Table for Fault is as shown in table 2, and ferroresonance decision table specific object is as follows, { Ua, Ub, Uc} is three phase voltage conditional attributes, { Uab, Uac, Ubc} is three line voltage conditions attributes, { Ia, Ib, Ic} is three phase current conditional attributes, U0 represents residual voltage conditional attribute, and { f} is frequency condition attribute, and phase differential represents that residual voltage and voltage raise mutually or reduces the angle between phase.In its conditional attribute value, for three-phase voltage, line voltage, phase current and residual voltage conditional attribute, " 1 " is illustrated under fundamental frequency measured value and raises out-of-limitly, and " 1 " measured value under fundamental frequency reduces out-of-limit, and " 0 " represents that measured value is in normal rated range; For frequency condition attribute " f ", " 1 " represents that the frequency of the measured value of this conditional attribute is fundamental frequency, and " 2 " represent point several times that the frequency of the measured value of this conditional attribute is fundamental frequency, and " 3 " represent that the measured value frequency of this conditional attribute is frequency multiplication." * " represents that the value of this conditional attribute is on not impact of classification.{ Fault} is decision attribute, and " JP " represents system generation fundamental resonance fault, and " FP " represents to occur Subharmonic Resonance fault, and " BP " represents to occur frequency multiplication resonance fault.PT disconnection fault decision table is as shown in table 3, and PT broken string decision table specific object is as follows, { Ua, Ub, Uc} is three phase voltage conditional attributes, { Uab, Uac, Ubc} is three line voltage conditions attributes, { Ia, Ib, Ic} is three phase current conditional attributes, and U0 represents residual voltage conditional attribute, and " 1 " represents the out-of-limit rising of conditional attribute value, it is out-of-limit that " 1 " represents that conditional attribute value reduces, and " 0 " represents that conditional attribute value is in normal range.{ Fault} is decision attribute, and PT primary circuit three-phase disconnection fault occurs " DX " expression system, and PT primary circuit disconnection fault occurs " DX-I " expression system, and PT secondary circuit disconnection fault occurs " DX-II " expression system.
Table 1
Table 2
Table 3
(2) three phase currents of PT, three phase voltages, three line voltage and residual voltage data are carried out to discretize processing, formation condition property value.If voltage, the out-of-limit rising of current value, set property as " 1 "; If voltage, the out-of-limit attenuating of current value, set property as " 1 "; If voltage, current value in normal range, set property as " 0 ".If frequency is fundamental frequency, conditional attribute value is set for " 1 "; If frequency, for dividing again and again, arranges conditional attribute value for " 2 "; If frequency is frequency multiplication, conditional attribute value is set for " 0 ".
(3) PT voltage, current condition property value are inquired about in above-mentioned three kinds of decision tables, obtained corresponding decision attribute, i.e. diagnostic result.
Can form following decision-making by table 1:
There is A phase earth fault in Rule1:if (Ua=-1and Ub=Uc=1) and (Ia=1and Ib=Ic=-1) Then Fault=JD(system);
There is B phase earth fault in Rule2:if (Ub=-1and Ua=Uc=1) and (Ib=1and Ia=Ic=-1) Then Fault=JD(system);
There is C phase earth fault in Rule3:if (Uc=-1and Ua=Ub=1) and (Ic=1and Ia=Ib=-1) Then Fault=JD(system);
Can form following rule by table 2:
Rule1:if Ua=Ub=Uc=1and f=1Then Fault=JP(system generation fundamental resonance fault);
Rule2:if Ua=1and Ub=Uc=-1and f=1and phase differential=0Then Fault=JP(system generation fundamental resonance fault);
Rule3:if Ub=1and Ua=Uc=-1and f=1and phase differential=0Then Fault=JP(system generation fundamental resonance fault);
Rule4:if Uc=1and Ua=Ub=-1and f=1and phase differential=0Then Fault=JP(system generation fundamental resonance fault);
Rule5:if Ua=Ub=1and Uc=-1and f=1and phase differential=180Then Fault=JP(system generation fundamental resonance fault);
Rule6:if Ua=Uc=1and Ub=-1and f=1and phase differential=180Then Fault=JP(system generation fundamental resonance fault);
Rule7:if Ub=Uc=1and Ua=-1and f=1and phase differential=180Then Fault=JP(system generation fundamental resonance fault);
Rule8:if f=2Then Fault=FP(system generation Subharmonic Resonance fault);
Rule9:if f=3Then Fault=BP(system generation frequency multiplication resonance fault);
Table 3 can form following rule:
There is PT primary circuit three-phase disconnection fault in Rule1:if Ua=Ub=Uc=U0=-1Then Fault=DX(system);
There is PT secondary circuit one phase disconnection fault in Rule2:if Ua=-1and Uab=Uac=-1and U0=-1Then Fault=DX-II(system);
There is PT secondary circuit one phase disconnection fault in Rule3:if Ub=-1and Uab=Ubc=-1and U0=-1Then Fault=DX-II(system);
There is PT secondary circuit one phase disconnection fault in Rule4:if Uc=-1and Ubc=Uac=-1and U0=-1Then Fault=DX-II(system);
There is PT secondary circuit two-phase disconnection fault in Rule5:if Ua=Ub=-1and Uab=Ubc=Uac=-1and U0=-1Then Fault=DX-II(system);
There is PT secondary circuit two-phase disconnection fault in Rule6:if Ua=Uc=-1and Uab=Ubc=Uac=-1and U0=-1Then Fault=DX-II(system);
There is PT secondary circuit two-phase disconnection fault in Rule7:if Ub=Uc=-1and Uab=Ubc=Uac=-1and U0=-1Then Fault=DX-II(system);
There is PT primary circuit one phase disconnection fault in Rule8:if Ua=-1and Uab=Uac=-1and U0=0Then Fault=DX-I(system);
There is PT primary circuit one phase disconnection fault in Rule9:if Ub=-1and Uab=Ubc=-1and U0=0Then Fault=DX-I(system);
There is PT primary circuit one phase disconnection fault in Rule10:if Uc=-1and Ubc=Uac=-1and U0=0Then Fault=DX-I(system);
There is PT primary circuit two-phase disconnection fault in Rule11:if Ua=Ub=-1and Uab=Ubc=Uac=-1and U0=0Then Fault=DX-I(system);
There is PT primary circuit two-phase disconnection fault in Rule12:if Ua=Uc=-1and Uab=Ubc=Uac=-1and U0=0Then Fault=DX-I(system);
There is PT primary circuit two-phase disconnection fault in Rule13:if Ub=Uc=-1and Uab=Ubc=Uac=-1and U0=0Then Fault=DX-I(system);
(4) if judgement is broken down, send immediately warning.
Claims (4)
1. power distribution network PT on-line monitoring and a fault diagnosis system, is made up of terminal, collector, three parts of background server, it is characterized by:
Described terminal is arranged on power distribution network PT three-phase line, utilizes electromagnetic induction principle to measure the electric current of the three-phase of power distribution network PT, low power consumption CPU module and radio-frequency communication module that terminal comprises built-in AD function;
Described collector is arranged on the panel of PT cabinet, the current data of the three-phase of the measured power distribution network PT of receiving terminal, measure phase voltage, line voltage and the residual voltage of PT simultaneously, more described current data, phase voltage, line voltage and residual voltage data upload are arrived to background server;
Described background server is arranged in transformer station, has optical fiber communication module, receives the data of collector, and power distribution network PT is carried out to on-line monitoring and fault diagnosis.
2. power distribution network PT on-line monitoring according to claim 1 and fault diagnosis system, is characterized in that:
Described terminal adopts amplifying circuit and high accurate A/D chip, can measure the electric current of 10-1000mA;
Described terminal can be measured the frequency of 25-250Hz scope, can measure accurately Subharmonic Resonance, fundamental resonance and frequency multiplication resonance.
3. power distribution network PT on-line monitoring according to claim 1 and fault diagnosis system, is characterized in that:
Described collector comprises voltage changer, voltage measurement module, radio-frequency communication module and optical fiber communication module; Radio-frequency communication module is connected with optical fiber communication module, the data of radio-frequency communication module receiving terminal, and send to optical fiber communication module by serial communication mode;
The input end of voltage changer is connected to PT secondary side by cable, and the output terminal of voltage changer is connected with the input end of voltage measurement module, and the output terminal of voltage measurement module is connected to optical fiber communication module;
PT phase voltage, line voltage and residual voltage are converted to respectively digital quantity by voltage changer and voltage measurement module, and send to optical fiber communication module by serial communication mode; Phase voltage, line voltage and residual voltage, current data are sent to the background server that is positioned at transformer station by optical fiber communication module.
4. the diagnostic method based on power distribution network PT on-line monitoring described in claim 1-3 and fault diagnosis system, is characterized in that, said method comprising the steps of:
(1) utilize rough set theory to set up the decision table of power distribution network PT fault diagnosis, comprise singlephase earth fault decision table, ferroresonance Decision Table for Fault, PT disconnection fault decision table;
(2) three phase currents of PT, three phase voltages, three line voltage and residual voltage data are carried out to discretize processing, formation condition property value;
(3) PT voltage, current condition property value are inquired about in above-mentioned four kinds of decision tables, obtained corresponding decision attribute, i.e. diagnostic result;
(4) if judgement is broken down, send immediately warning.
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| CN106597188A (en) * | 2016-11-16 | 2017-04-26 | 安徽合凯电气科技股份有限公司 | Single-phase ground fault diagnosis method on various conditions of cable, overhead line, and parallel-serial line |
| CN108490315A (en) * | 2018-05-18 | 2018-09-04 | 云南电网有限责任公司电力科学研究院 | A kind of defeated, distribution line failure positioning device based on electromagnetic induction |
| CN109283407A (en) * | 2018-08-13 | 2019-01-29 | 中国南方电网有限责任公司超高压输电公司梧州局 | Voltage circuit based on whole station date comprision monitors system |
| CN111812393A (en) * | 2020-06-11 | 2020-10-23 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Large-current fault diagnosis system and method based on rough set theory |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104297625A (en) * | 2014-11-07 | 2015-01-21 | 安徽马钢自动化信息技术有限公司 | PT wire breakage diagnosis system and method |
| CN106597188A (en) * | 2016-11-16 | 2017-04-26 | 安徽合凯电气科技股份有限公司 | Single-phase ground fault diagnosis method on various conditions of cable, overhead line, and parallel-serial line |
| CN106597188B (en) * | 2016-11-16 | 2019-01-08 | 安徽合凯电气科技股份有限公司 | Single-phase earth fault discrimination method under cable, aerial and mixed connection route |
| CN108490315A (en) * | 2018-05-18 | 2018-09-04 | 云南电网有限责任公司电力科学研究院 | A kind of defeated, distribution line failure positioning device based on electromagnetic induction |
| CN109283407A (en) * | 2018-08-13 | 2019-01-29 | 中国南方电网有限责任公司超高压输电公司梧州局 | Voltage circuit based on whole station date comprision monitors system |
| CN109283407B (en) * | 2018-08-13 | 2020-09-29 | 中国南方电网有限责任公司超高压输电公司梧州局 | Voltage loop monitoring system based on total station data contrastive analysis |
| CN111812393A (en) * | 2020-06-11 | 2020-10-23 | 山西潞安环保能源开发股份有限公司五阳煤矿 | Large-current fault diagnosis system and method based on rough set theory |
| CN112462303A (en) * | 2021-01-28 | 2021-03-09 | 浙江艾罗网络能源技术股份有限公司 | Connection identification detection method of power grid current sensor |
| CN112462303B (en) * | 2021-01-28 | 2021-05-04 | 浙江艾罗网络能源技术股份有限公司 | Connection identification detection method of power grid current sensor |
| CN113447847A (en) * | 2021-04-07 | 2021-09-28 | 国网江苏省电力有限公司徐州供电分公司 | Power distribution system fault identification method based on zero sequence signal analysis |
| CN116736039A (en) * | 2023-06-15 | 2023-09-12 | 国网吉林省电力有限公司长春供电公司 | Comprehensive evaluation system for single-phase earth fault line selection of power distribution network |
| CN116736039B (en) * | 2023-06-15 | 2024-02-06 | 国网吉林省电力有限公司长春供电公司 | Comprehensive evaluation system for single-phase earth fault line selection of power distribution network |
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