CN101710158B - Substation automation system (SAS) with insulation on-line monitoring function for high voltage electric power equipment - Google Patents

Substation automation system (SAS) with insulation on-line monitoring function for high voltage electric power equipment Download PDF

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CN101710158B
CN101710158B CN200810182616XA CN200810182616A CN101710158B CN 101710158 B CN101710158 B CN 101710158B CN 200810182616X A CN200810182616X A CN 200810182616XA CN 200810182616 A CN200810182616 A CN 200810182616A CN 101710158 B CN101710158 B CN 101710158B
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phasor
pmu
ipmu
measure
synchronized
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CN200810182616XA
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CN101710158A (en
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李娟�
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北京机械工业学院
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Abstract

The invention relates to a technology for realizing insulation state on-line monitoring for high voltage electric power equipment in a substation under the architecture of a substation automation system (SAS), and discloses a method, a device and a system of insulation on-line monitoring for high voltage electric power equipment, which realizes synchronized phasor measurement by using a measurement unit at a spacer layer of the SAS and is realized by combining the internal communication of the SAS. The system comprises a monitoring main station at a station control layer, a synchronized phasor measurement unit (PMU) at a spacer layer, and a current synchronized phasor measurement unit (IPMU) which is locally installed dispersedly. The PMU and the IPMU realize the phasor measurement based on clock synchronization, and the PMU realizes the measurement at the spacer layer and the insulation on-line monitoring for main equipment; the IPMU measures the synchronized phasor of the leakage current of capacitive equipment and realizes the insulation on-line monitoring for the capacitive equipment by using the busbar voltage measured by the PMU; and the characteristic quantity of insulation monitoring adopts the variable quantity of leakage active power. The monitor main station, the PMU and the IPMU can also form a special insulation on-line monitoring system for the high voltage electric power equipment.

Description

Electric substation automation system with high voltage electric power equip ment function of insulation online monitoring
Technical field
The present invention relates to the insulating monitoring of transformer station's inner high voltage power equipment of electric system, generating plant, belong to high voltage electric power equip ment repair based on condition of component and on-line monitoring field and automation of transformation substations field.
Background technology
Extra-high voltage, EHV transmission are the features of modern power systems and power transmission network, and insulation proposes higher requirement to higher electric pressure to power equipment, spurs the application of material science and on-line monitoring technique simultaneously.Most faults of extra-high voltage, supergrid show as insulation and wreck, high voltage electric power equip ment except that power transmission line is all concentrated and is placed in the transformer station, comprises main-transformer, primary cut-out, current transformer (CT), capacitance type potential transformer (CPT), sleeve pipe, coupling condenser, lightning arrester etc.The safe operation of high-tension power transmission and transformation equipment is the key factor that influences power system security, stable and economical operation.High-tension apparatus generation insulation fault not only can cause equipment itself to damage, but also can cause many-sided loss.
Along with the continuous increase of electric pressure and place capacity, make that the equipment failure repair time is more and more longer, expense is also more and more higher.Traditional timing maintenance (scheduled overhaul) can't have been satisfied the requirement of high voltage electric power equip ment safe and stable operation owing to there are shortcomings such as not enough maintenance and superfluous maintenance.In order to reduce operating cost, improve the operational efficiency of equipment and to improve the quality of power supply etc., status monitoring replaces the timing detection and has become inexorable trend.Real-time insulating monitoring and diagnostic techniques are the bases of repair based on condition of component, high voltage electric power equip ment is carried out on-line monitoring, in time prediction and tracing trouble all have great importance to the normal operation of guaranteeing power equipment, the reliability that improves electrical network and to equipment and operations staff's safety.
The monitoring of high voltage electric power equip ment insulation status is at present usually based on the monitoring to its dielectric loss value tg δ, dielectric leakage electric current I P and electric capacity C.The test philosophy of dielectric loss can be sketched to current signal and voltage signal with measurand are sent to Test Host, and the phase place with two signals compares then, thereby obtains the dielectric loss value of equipment.Current signal generally is to adopt current sensor to obtain from tested power equipment end screen down conductor, to measurement mechanism, makes that small leakage current signal is difficult to accurately measure through longer cable transmission.The sampling of voltage signal also is to deliver to Test Host from bus PT secondary side by longer cable usually, because the existence of the angular difference of PT own, phase shift has taken place for secondary voltage and primary voltage.This wired mode makes on-the-spot line very complicated, and unreliability increases, and the error of introducing is bigger, and easy care not after the fault.
Electric substation automation system (SAS) is an integral system of realizing that transformer station measures, controls, protects, communicates by letter.Because the technical reason electric substation automation system does not contain high voltage electric power equip ment on-line monitoring function, the electric substation automation system with on-line monitoring function is the inexorable trend of technical development at present.
This patent is under the framework of existing electric substation automation system, realize the high voltage electric power equip ment insulated on-line monitoring by wall measure and control device (PMU and IPMU) with synchronous phasor measurement function, have distributed measurement, measuring accuracy height on the spot, can realize the high voltage electric power equip ment insulated on-line monitoring, and can be used as a subfunction and include electric substation automation system in.
Summary of the invention
The present invention relates under electric substation automation system (SAS) framework, realize transformer station's inner high voltage power equipment state of insulation on-line monitoring technique, disclose a kind of electric substation automation system wall measure and control device that utilizes and realized synchronous phasor measurement, and method, the Apparatus and system of the high voltage electric power equip ment insulated on-line monitoring of realizing in conjunction with the electric substation automation system intercommunication.This system comprises station level master station, wall synchronized phasor measure and control device (PMU) and disperses local mounted electric current synchronous phasor measuring device (IPMU).Wherein PMU and IPMU realize the synchronous phasor measurement based on clock synchronization, and PMU realizes wall observing and controlling and to the insulated on-line monitoring of main equipment; PMU calculates busbar voltage synchronized phasor (P_V) based on clock synchronization, broadcast P_V by wall communication unit (BCOM) to IPMU, IPMU measures the leakage current synchronized phasor of capacitive apparatus, realization is to the insulated on-line monitoring of capacitive apparatus, and the characteristic quantity of insulating monitoring adopts the variable quantity that leaks active power.IPMU includes electric substation automation system in as a class distributed measurement device, and the communication mode of IPMU and wall is fieldbus or radio communication, thereby makes electric substation automation system have the high voltage electric power equip ment function of insulation online monitoring.Also can constitute special high voltage equipment insulation on-line monitoring system by master station, synchronized phasor measure and control device and electric current synchronous phasor measuring device.
The present invention is applicable to the insulating monitoring of the high voltage electric power equip ment of transformer station in the various electric pressure transformer stations of industrial trades such as electric system and metallurgy, chemical industry, railway and the generating plant, is applicable to the insulation-monitoring function of realization high voltage electric power equip ment in electric substation automation system.
The concrete steps and the technical essential that realize the high voltage electric power equip ment insulated on-line monitoring in electric substation automation system are as follows:
1) electric substation automation system (SAS) is by the station level master station that is positioned at the pulpit be positioned at electric room or on-the-spot little wall measure and control device is formed, as shown in Figure 2.Wherein station level comprises server, operator station, engineer station, telemechanical station, monitoring station on the spot; Wall comprises the measure and control device of high pressure equipment observing and controlling functions such as realizing circuit, main-transformer respectively; Constitute electric substation automation system by communication network.Electric substation automation system by gps clock realize to the time, in measure and control device, realize date Hour Minute Second and millisecond to the time, to the time precision be the microsecond level, the SOE resolution between the measure and control device is 1ms.
2) increase realizes the synchronous phasor measurement based on the GPS unified clock to the measurement passage of leakage current in measure and control device.Usually transformer station measurement and control device to the time only be used to produce SOE and incident markers, be not used in synchronized sampling and calculating synchronously, this patent adopts GPS to come the data acquisition and the phasor calculation of the AI plug-in unit/module of each wall measure and control device synchronously, such measure and control device is called synchronized phasor measure and control device (PMU), and then realize that the phasor between each synchronous phasor measuring device compares and calculating synchronously under the same electric pressure, thereby realize the insulating monitoring of high voltage electric power equip ment.
The implementation method of synchronized phasor measure and control device (PMU) be by the GPS synchronizing pulse realize measure and control device inside be used for CPU that of ac gathers and A/D part to the time, determine unified synchronized phasor interval of delta t computing time of transformer station (Δ t<1s), be used to start the measure and control device synchronized sampling and calculate synchronized phasor, and the mark markers.The earth leakage current and the busbar voltage of synchronized phasor measure and control device (PMU) monitoring high pressure main equipment obtain voltage synchronized phasor (P_V) and electric current synchronized phasor (P_I) respectively.
3) synchronized phasor measure and control device (PMU) is used to measure major equipments such as main transformer in the transformer station, inlet wire, outlet.In addition also has a large amount of capacitive apparatus, comprise PT, CT, coupling condenser, lightning arrester etc., near installing electric current synchronous phasor measuring device (IPMU) these capacitive apparatus, IPMU measures capacitive apparatus leakage current synchronized phasor (P_I), cooperates PMU to realize capacitive apparatus insulated monitoring.
4) in order to improve the measuring accuracy of feeble signal, adopt synchronized phasor measure and control device (PMU) to measure P_V and P_I for main equipment; For the various capacitive apparatus that disperse to lay, the P_I that adopts electric current synchronous phasor measuring device (IPMU) to measure obtains the P_V that PMU measures by communication; Wall adopts fieldbus or radio communication to communicate by letter with IPMU.For newly-built transformer station, can unify to lay Shielded Twisted Pair, adopt field bus technique, for example Profibus-DP, LonWorks, CAN etc.; For transforming transformer station,, adopt communication for fear of in transformer station, laying a large amount of cables, wireless sensor network (WSN/ZigBee) for example, at wall wireless communication unit is set, in each IPMU device, adopts wireless communication module, realize communicating by letter of wall and IPMU.
PMU determines identical sampling rate with IPMU, adopts weekly ripple 128 point samplings to illustrate here, i.e. the 6.4k/s sampling rate.PMU and IPMU obtain correct time signal, for example pulse per second (PPS) by the GPS receiver module.Wherein pps pulse per second signal is admitted to the measurement MCU of PMU and IPMU, and through produce meticulousr timing sampling task (or interruption) behind the frequency division in MCU, Δ t<1s is the example explanation here with 100ms.PMU, IPMU obtain accurate clock information, comprise date, Hour Minute Second and millisecond, in per 1 second zero hour of absolute time, with every 100ms is the cycle, start synchronous phasor measurement, calculate the phasor of 20ms (an electric parameters cycle) from this moment, and stamp the synchronized phasor of markers as this moment.
The cycle (128 point) of sampling obtains time series, is designated as:
X(0),X(1),X(2),...,X(127)
For PMU, synchronized sampling three-phase bus voltage U a, Ub, Uc is designated as:
Ua(0),Ua(1),Ua(2),...,Ua(127)
Ub(0),Ub(1),Ub(2),...,Ub(127)
Uc(0),Uc(1),Uc(2),...,Uc(127)
Certainly, also have other amount among the PMU by synchro measure, for example Ben Di 3 phase currents do not describe in detail here yet.
For IPMU, synchronized sampling three-phase end screen leakage current Ia, Ib, Ic is designated as:
Ia(0),Ia(1),Ia(2),...,Ia(127)
Ib(0),Ib(1),Ib(2),..,Ib(127)
Ic(0),Ic(1),Ic(2),...,Ic(127)
In PMU and IPMU, above-mentioned sampled value is done phasor calculation respectively, as follows:
Re = Σ i = 0 127 ( cos ( 2 π 128 · i ) · X ( i ) ) - - - ( 1 )
Im = Σ i = 0 127 ( sin ( 2 π 128 · i ) · X ( i ) ) - - - ( 2 )
A = Re 2 + Im 2 - - - ( 3 )
θ = arctg ( Im Re ) - - - ( 4 )
Wherein Re is the phasor real part, and Im is the phasor imaginary part, and A is a phasor amplitude, and θ is the phasor phase place.
PMU, IPMU regularly 100ms calculate primary voltage, electric current phasor, obtain to be spaced apart the phasor time series of 100ms:
U · a ( k 1 ) , U · a ( k 2 ) , U · a ( k 3 ) , . . . , U · a ( kn )
U · b ( k 1 ) , U · b ( k 2 ) , U · b ( k 3 ) , . . . , U · b ( kn )
U · c ( k 1 ) , U · c ( k 2 ) , U · c ( k 3 ) , . . . , U · c ( kn )
I · a ( k 1 ) , I · a ( k 2 ) , I · a ( k 3 ) , . . . , I · a ( kn )
I · b ( k 1 ) , I · b ( k 2 ) , I · b ( k 3 ) , . . . , I · b ( kn )
I · c ( k 1 ) , I · c ( k 2 ) , I · c ( k 3 ) , . . . , I · c ( kn )
Above synchronized phasor both had been used for the remote measurement amount of electric substation automation system, was used for insulated on-line monitoring again.
5) insulating monitoring CALCULATION OF PARAMETERS
PMU calculates the leakage current synchronized phasor P_I of busbar voltage synchronized phasor P_V and main equipment, and IPMU calculates the leakage current synchronized phasor P_I of capacitive apparatus.
PMU realizes the insulated on-line monitoring to main equipment (main transformer, primary cut-out etc.), and judges whether to report to the police.
Each electric pressure set a PMU regularly 100ms the time series of ABC voltage in three phases synchronized phasor (P_V) is sent to this bus wall communication unit (BCOM), BCOM broadcasts this busbar voltage synchronized phasor to each IPMU that belongs to this bus, each IPMU calculates the insulating monitoring parameter of local capacitive apparatus after receiving PMU busbar voltage synchronized phasor, and judges whether to report to the police.
Reacting the characteristic quantity of each high voltage equipment insulation level selects for use insulation to leak active power P Active, P ActiveBe calculated as follows:
P active=U re·I re+U im·I im (5)
6) warning of insulating monitoring
The PMU device is finished the P of monitored main equipment ActiveCalculating.IPMU calculates the P of monitored capacitive apparatus after receiving the P_V that PMU sends ActivePMU and IPMU are respectively to P ActiveSurpass setting value and do warning.Directly by sending the master station of electric substation automation system on the wall network, the warning of IPMU transfers to the electric substation automation system master station by wall communication unit (BCOM) in the warning of PMU.P ActiveThreshold value is set at the leakage active power size when maintenance identification insulation is good under each electric pressure.
Because transformer station's inner high voltage number of devices is more, in order effectively to manage the insulation information of each equipment, each equipment P of record in the master station of electric substation automation system Active, and the formation history curve is used for trend analysis.Master station monitoring P ActiveDiurnal variation rate, all rate of change and monthly variation rate, when corresponding rate of change surpasses the operation setting value, report to the police.Definition rate of change λ is calculated as follows:
λ P active = | P active ( T 2 ) - P active ( T 1 ) | | ( P active ( T 1 ) - P active ( T 2 ) ) / 2 | - - - ( 6 )
In the formula, T 2=T 1+ Δ T, Δ T get 1 day, 1 week, January respectively.Potential insulation damages has taken place or has been in fault early stage in insulation parameter rate of change alarm response power equipment.
7) PMU, IPMU and master station also can constitute insulated on-line monitoring system separately.As shown in Figure 9.
Description of drawings
Fig. 1 has illustrated main electrical scheme and the relevant device in the transformer station.With 110kV transformer station is example, comprises high-tension electricity equipment such as main-transformer, inlet wire, bus, outlet, isolating switch, PT, CT, lightning arrester, coupling condenser, reactive-load compensation capacitor in the transformer station.Wherein the electric pressure of inlet wire is identical, and quantity is generally 2 bars at the most; Bus section is provided with or the wiring of many buses; Main-transformer is realized the conversion of a plurality of electric pressures; Between inlet wire, outlet and bus, isolating switch is set; Voltage transformer (VT) (PT) is set at the bus place, current transformer, lightning arrester and coupling condenser is set in circuit inlet wire, outlet.The insulation status of equipment such as wherein main-transformer of this patent monitoring, isolating switch, PT, CT, lightning arrester, coupling condenser.
Fig. 2 and Fig. 3 have illustrated two kinds of system architectures of electric substation automation system.Electric substation automation system is the layered distribution type system, is divided into station level and wall, and wherein station level constitutes main station system by many monitoring host computers, comprises server, operator station, engineer station, uses workstation and telemechanical station on the spot; Wall by with transformer station in primary equipment (circuit, transformer etc.) one to one measure and control device constitute; these measure and control devices are realized measurement, the control of equipment such as inlet wire, outlet, transformer, PT (i.e. interval) and are communicated by letter, insert this protective device relevant information at interval by communication simultaneously.The wall measure and control device constitutes electric substation automation system by network and station level.The wall measure and control device is divided into two kinds, and a kind of is to concentrate group screen to be placed between electronics, and another kind is in little of distribution scene of being placed in and the switch cubicle.Electric substation automation system realize inner to the time and clock synchronization, wherein station level obtains date Hour Minute Second information accurately by server by gps clock, for concentrate be placed on interelectric wall measure and control device by gps clock IRIG-B or pulse to the time signal time service to millisecond (as shown in Figure 2); Be placed on for distribution GPS receiver module that on-the-spot little measure and control device carries by measure and control device receive IRIG-B or pulse to the time obtain millisecond information accurately, shown in the frame of broken lines among Fig. 3.Master station by communication network to each measure and control device time service to the date Hour Minute Second.
Fig. 4 has illustrated the conventional inner structure of wall measure and control device of electric substation automation system.Measure and control device by power insert, master cpu plug-in unit, to the time module (RIRG-B or pulse to time), AI plug-in unit, DI plug-in unit, DO plug-in unit, communication plug-in unit constitute.Wherein AI, DI, DO can polyliths, and quantity is finished the control output of collection, calculating and the switching value of ac analog, DC analogue quantity, switching value respectively by each actual needs configuration at interval.To the time module only to master cpu plug-in unit and DI realize millisecond to the time, communication plug-in unit is realized the intercommunication and the correspondence with foreign country of measure and control device, correspondence with foreign country comprises communicates by letter with wall and communicates by letter with station level.
Fig. 5 has illustrated the inner structure of the novel synchronous phase measurement and control device (PMU) that this patent adopts.Synchronized phasor measure and control device (PMU) by power insert, master cpu plug-in unit, to the time module (RIRG-B or pulse to time), AI plug-in unit (comprising the custom plug-in of measuring leakage current), DI plug-in unit, DO plug-in unit, communication plug-in unit constitute.Wherein AI, DI, DO can polyliths, and quantity is finished the control output of collection, calculating and the switching value of ac analog, DC analogue quantity, switching value respectively by each actual needs configuration at interval.The difference of PMU and conventional wall measure and control device be its increased to the measurement of end screen leakage current and number extraction system by to the time pulse finish sampling and calculating to analog quantity.
To the time module (IRIG-B or pulse) to master cpu and each DI plug-in unit to the time to millisecond, master cpu through inner frequency division to AI plug-in unit output number adopt to the time pulse, interval of delta t, Δ t<1S gets 100ms here.Being each AI plug-in unit began to do sampling by identical sampling rate in each whole second zero hour time, was taken as 6.4k here, i.e. ripple 128 points weekly, and utilize formula (1)~(4) to calculate phasor, and stamp markers, be called synchronous phasor measurement.Communication plug-in unit is realized the intercommunication and the correspondence with foreign country of measure and control device, and correspondence with foreign country comprises communicates by letter with wall and communicate by letter with station level.
Fig. 6 has illustrated the inside of several extraction systems of novel synchronous phase measurement and control device (PMU) to form, by external punching Hall type current sensor measurement three-phase leakage current, by electromagnetic current transducer, voltage measuring transformer main equipment three-phase current and bus three-phase voltage; Pulse signal by frequency division output control each the A/D chip synchronized sampling of master cpu plug-in unit after the GPS time service, the MCU of AI plug-in unit drives A/D by SPI or parallel bus and realizes synchronized sampling, and calculate real part, imaginary part and mould, the angle of voltage phasor Ua, Ub, Uc, markers in conjunction with sampling instant constitutes the synchronized phasor time series, give the master cpu module through the device intercommunication, the AI plug-in unit calculates measuring amount such as the calculative power of measure and control device simultaneously.The master cpu module regularly judge the insulation of measured main equipment leak active power and on send main website.
Fig. 7 has illustrated the inside of electric current synchronous phasor measurement unit IPMU to form and design.IPMU is adopted unit (A/D), MCU unit, MMI unit, GPS unit, communication unit and power supply and is formed by external Hall type current transformer unit (CT), number.The external punching in CT unit is socketed on the capacitive apparatus ground wire (end screen), and 3 CT measure three-phase leakage current Ia, Ib, Ic simultaneously, and former limit leakage current range is 0~50mA (AC), and CT secondary output signal is positive and negative 5V voltage signal; The GPS unit receives by portable gps antenna and the decoding satellite clock, communicate by letter with MCU by UART, make MCU obtain the accurate date, Hour Minute Second information, GPS unit output pps pulse per second signal is given MCU, MCU receives pps pulse per second signal, after the CPU timing, produce 100ms timing sampling task at interval, MCU every interval 100ms after reaching the per 1 second zero hour of absolute time begins to start the A/D sampling, sampling rate sampling 20ms with 6.4k, i.e. 1 cycle, MCU reads the A/D sampled data and does phasor calculation by SPI or parallel bus, calculates electric current phasor Ia, Ib, the real part of Ic, imaginary part and mould, angle.MCU calculates the insulation leakage active power P of corresponding capacitive apparatus with the voltage synchronized phasor of electric current synchronized phasor and PMU ActiveMCU communicates by letter with communication unit through the high speed serial ports, realizes the correspondence with foreign country of IPMU by communication unit, comprise the configuration that receives master station, the voltage synchronized phasor that receives PMU and on send the insulation parameter of the monitored high-tension apparatus in master station this locality.Communication unit can adopt fieldbus unit or wireless communication unit.
Fig. 8 has illustrated the complete electric substation automation system with high voltage electric power equip ment function of insulation online monitoring.Comprise master station, synchronized phasor measure and control device (PMU), field bus communication unit and wireless communication unit and electric current synchronous phasor measuring device.
Fig. 9 has illustrated to constitute independently insulation on-line monitoring system of substation of function by insulating monitoring main website, PMU and IPMU.
Embodiment
With 110kV shown in Figure 1 transformer station is example, is provided with N platform master station at transformer station's master-control room, and it is F1H, F2H that the main website address is set ..., FnH.At two main-transformers, 110kV lead-in circuit breaker, bus, 10kV outlet isolating switch, 10kV bus, 10kV house transformer place configuration PMU, the PMU address is respectively 01H, 02H ..., ordering successively.At PT, the 10kV inlet wire CT configuration of IP MU of place of PT, the 110kV inlet wire CT of 110kV, 110kV inlet wire lightning arrester, 10kV, the IPMU address of 110kV is respectively 81H, 82H ..., ordering successively; The IPMU address of 10kV is respectively A1H, A2H ..., ordering successively.PMU and IPMU are divided into 110kV and two groups of 10kV by electric pressure.Two groups respectively are provided with a wall communication unit BCOM, and the address of two BCOM is respectively FDH, FEH.Specify the 110kV group to send the voltage synchronized phasor by the PMU of a 110kV main-transformer to the IPMU of 110kV group, the 10kV group sends the voltage synchronized phasor by the PMU of a 10kV house transformer to the IPMU of 10kV group.BCOM adopts the CAN bus to communicate by letter with IPMU.
PMU by the electric substation automation system gps clock to the time, IPMU by the GPS receiver module to the time, system starts working.PMU and IPMU timing 100ms finish voltage, electric current synchronous phasor measurement.Each bus group sends voltage synchronized phasor time series to the interior BCOM of group by the PMU of appointment by timing 1s, and BCOM broadcasts voltage synchronized phasor by timing 1s by CAN bus each IPMU in group.PMU regularly 1s calculates the leakage active power of main equipment and compares with definite value, reports to the police when surpassing definite value, send master station on the warning message, send the leakage active power of master station main equipment on the PMU timing 10min; IPMU timing 1s calculates capacitive apparatus and leaks active power, and compares with definite value, reports to the police when surpassing definite value, send master station on the warning message, send the leakage active power of master station capacitive apparatus on the IPMU timing 10min.
Master station writes down the leakage active power curve of each main equipment and capacitive apparatus in the conventional monitoring function of realizing electric substation automation system, whether show has apparatus insulated warning.Master station is regularly judged the variable quantity of each apparatus insulated leakage active power every day, comprise value and the difference of the value of same time of the previous day on the same day, the difference of the value of the same day value and same time of the last week, the difference of the value of the same day value and preceding same time in January is reported to the police to surpassing definite value person.

Claims (2)

1. insulated monitoring method with electric substation automation system of high voltage electric power equip ment function of insulation online monitoring, this method may further comprise the steps:
1) this system comprises station level master station, wall synchronized phasor measure and control device PMU and local mounted electric current synchronous phasor measuring device IPMU, wherein synchronized phasor measure and control device PMU and electric current synchronous phasor measuring device IPMU realize the synchronous phasor measurement based on clock synchronization, and electric current synchronous phasor measuring device IPMU measures capacitive apparatus leakage current synchronized phasor; The cell device of each electric pressure is provided with a wall communication unit BCOM, the wall communication unit is communicated by letter with the local mounted electric current synchronous phasor measuring device of dispersion IPMU by fieldbus or communication, wherein, synchronized phasor measure and control device PMU by GPS to the time automatically generate based on determining timing sampling pulse or order constantly, drive that the number extraction system realizes under the clock of unanimity that synchronization begins etc. the synchronized sampling of sampling rate, the phasor that each synchronized phasor measure and control device PMU of electric substation automation system inside is calculated is synchronous;
2) wall synchronized phasor measure and control device PMU by GPS to the time realize the synchronized sampling of number extraction system, and then realization synchronous phasor measurement, synchronized phasor comprise busbar voltage synchronized phasor and this measure and control device the leakage current synchronized phasor of corresponding main equipment, and calculate leakage active power as sending master station on the insulating monitoring characteristic quantity, realize insulated on-line monitoring to main equipment;
3) each electric pressure is set a synchronized phasor measure and control device PMU regularly sends synchronizing voltage phasor time series from this bus to wall communication unit BCOM, wall communication unit BCOM regularly to electric current synchronous phasor measuring device IPMU broadcasting busbar voltage phasor, is used for the insulated on-line monitoring that electric current synchronous phasor measuring device IPMU realizes capacitive apparatus;
4) each electric current synchronous phasor measuring device IPMU receives the busbar voltage synchronized phasor, measure capacitive apparatus leakage current synchronized phasor, and the leakage active power of calculating this capacitive apparatus realizes the insulated on-line monitoring to capacitive apparatus as sending master station on the insulating monitoring characteristic quantity;
5) the electric substation automation system master station receives the leakage active power P of each synchronized phasor measure and control device PMU and electric current synchronous phasor measuring device IPMU in real time Active, judge whether to surpass the operation permissible value, and to surpassing the equipment alarm of threshold; Master station is judged the leakage active power P of same high-tension apparatus ActiveAt the rate of change λ of certain hour, the high voltage electric power equip ment that rate of change λ is bigger is reported to the police.
2. according to the described insulated monitoring method of claim 1, it is characterized by; For the wall main equipment, realize that by wall synchronized phasor measure and control device PMU self main equipment leaks the on-line measurement of active power; For capacitive apparatus, adopt wall synchronized phasor measure and control device PMU to measure its busbar voltage synchronized phasor, and be broadcast to each electric current synchronous phasor measuring device IPMU under this bus through wall communication unit BCOM, finish on-line measurement by electric current synchronous phasor measuring device IPMU to the leakage active power of capacitive apparatus.
CN200810182616XA 2008-12-09 2008-12-09 Substation automation system (SAS) with insulation on-line monitoring function for high voltage electric power equipment CN101710158B (en)

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