CN202474817U - Intelligent microcomputer comprehensive protection device for transformer of power plant - Google Patents
Intelligent microcomputer comprehensive protection device for transformer of power plant Download PDFInfo
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Abstract
The utility model provides an intelligent microcomputer comprehensive protection device for a transformer of a power plant, comprising a measuring analog quantity collection module, a switch value input module, a microcontroller, an output control module and a photoelectric isolation unit, wherein the measuring analog quantity collection module collects the measuring current, the voltage and the protection current of each phase of the transformer of the power plant, the switch value input module collects an external control switch value signal, the microcontroller converts analog signals received from the measuring analog quantity collection module into digital quantity and performs logic analysis determination in combination with the external control switch value signal collected by the switch value input module, and the output control module outputs control signals used for controlling a high voltage switch apparatus and a fault alarming apparatus according to a determination result. The intelligent microcomputer comprehensive protection device replaces relay logic control with digital quantity logic control, thereby simplifying system structure, reducing system size, increasing system reliability and anti-interference capability, and reducing system cost; and is also provided with functions of time synchronization, timing, man-machine interaction and communication.
Description
Technical field
The utility model relates to the tranformer protection technical field, relates in particular to a kind of unit transformer intelligence computer integrated protection.
Background technology
Common unit transformer (promptly; The transformer of the special own electricity consumption of electric power supply plant) protective device is a kind of relaying protection automatics; It analyzes institute's detection transformer duty parameter and other input control logic signals through relay control logic, the malfunction of transformer is protected and record, because it occurs early; Use extensively, also occupy suitable application share at present in the tranformer protection field.
Accompanying drawing Fig. 1 is the schematic composition structure chart of existing common unit transformer protective device.As shown in Figure 1; Common unit transformer protective device generally wraps collection of simulant signal module 100, analog signal logical conversion module 200, logic analysis control module 300, switching input module 400, control output module 500; Logic analysis control module 300 is connected with analog signal logical conversion module 200, switching input module 400, control output module 500 respectively, and collection of simulant signal module 100 is connected with analog signal logical conversion module 200.Wherein, collection of simulant signal module 100 is used to gather the operating current and the voltage signal of transformer, and preferably, said protection setting parameter comprises at least one in following: zero sequence overcurrent set point; Zero sequence overvoltage set point; Each phase overcurrent set point; Each phase overvoltage set point; Quick-break time limit set point; Time limit is set in limited time; The inverse time lag set point; Temperature value is set.
And carry out logical transition with sending to analog signal logical conversion module 200 after the current and voltage signals Filtering Processing of gathering; The conversion of signals that analog signal logical conversion module 200 is used for collection of simulant signal module 100 is received be for can supply the drive signal of logic analysis, and the drive signal after will changing sends to logic analysis control module 300 and carries out logic analysis; Switching input module 400 is used for other input control switch quantitative change is changed to the logical signal that can supply the identification of logic analysis control module, and the logical signal after the conversion is inputed to logic analysis control module 300; Logic analysis control module 300 is used for each input logic signal is analyzed through Control Network, and exports to control output module 500 to the logic determines result; Control output module 500 is used for converting judged result into can supply external equipment to use control signal, drives the external equipment action.More than form structure except that collection of simulant signal module 100, each module all is made up of various types of relays, and whole system is very complicated.
Specifically, there is following problem in common common unit transformer protective device:
1, owing to analog signal logical conversion module 200, logic analysis control module 300, switching input module 400, control output module 500 all are made up of various types of relays, complex structure, volume is big; The fault point is many; Reliability is low, poor anti jamming capability, and cost is high;
2, the system parameters difficulty of adjusting, inconvenient operation;
3, do not have the fault data recorder function, be unfavorable for the fault ex-post analysis;
4, do not have communication function, rely on manual inspection, real-time is poor;
Summary of the invention
In order to overcome the above problems; The utility model provides a kind of unit transformer intelligence computer integrated protection, replaces relay logic control, simplied system structure with the digital quantity logic control; Reduction system volume, raising system reliability and antijamming capability reduce system cost.
In order to realize above purpose, the unit transformer intelligence computer integrated protection that the utility model provides comprises measure analog amount acquisition module, switching input module, microcontroller, output control module and photoelectricity isolated location.Wherein, the photoelectricity isolated location is connected between microcontroller and switching input module and the output control module; Measure analog amount acquisition module is used to gather measurement electric current, voltage and the protective current of each phase of station transformer, and the electric current of gathering and voltage signal are sent to microcontroller handles; Switching input module is used to gather external control switch amount signal, and the external control switch amount signal of gathering is sent to microcontroller through the photoelectricity isolated location handles; Microcontroller is used for converting the electric current and the voltage signal of the simulation that receives from measure analog amount acquisition module to digital quantity; And combine the external control switch amount signal of switching input module collection and the protection setting parameter of setting to carry out the logic analysis judgement, and judged result is sent to output control module as the output signal through the photoelectricity isolated location; Output control module is used to receive the judged result of microcontroller output, it is isolated amplify high voltage switching device and the accident warning device of output with control connection station transformer and electrical network.
Preferably; Said measure analog amount acquisition module comprises measuring voltage collection branch road, measures current acquisition branch road and protective current collection branch road; Wherein: measuring voltage is gathered branch road and is comprised the voltage transformer and first low-pass filter circuit; Wherein, measurement voltage signal converts the small voltage signal into through voltage transformer, is input to microcontroller through first low-pass filter circuit then; Measure the current acquisition branch road and comprise first current transformer, first sample resistance and second low-pass filter circuit; Wherein, Measure current signal and convert little current signal into through first current transformer; Be transformed to the small voltage signal through first sample resistance, be input to microcontroller through second low-pass filter circuit then; Protective current is gathered branch road and is comprised second current transformer, second sample resistance and the 3rd low-pass filter circuit; Wherein, Measure current signal and convert little current signal into through second current transformer; Be transformed to the small voltage signal through second sample resistance, be input to microcontroller through the 3rd low-pass filter circuit then.
Preferably, said switching input module comprises and is used to receive the second photoelectricity isolated location of external control switch amount signal, the low-pass filter circuit that is used to protect the current-limiting resistance of the second photoelectricity isolated location and is used for the output of the second photoelectricity isolated location is carried out filtering.
Preferably, said output control module comprises and is used for the output signal of microcontroller is isolated and the 3rd photoelectricity isolated location that amplifies, is used to the specific logical protection relay protecting the components and parts of the 3rd photoelectricity isolated location and be used for exporting according to the output signal of the 3rd photoelectricity isolated location said control signal.
Preferably, said protection setting parameter comprises at least one in following: zero sequence overcurrent set point; Zero sequence overvoltage set point; Each phase overcurrent set point; Each phase overvoltage set point; Quick-break time limit set point; Time limit is set in limited time; The inverse time lag set point; Temperature value is set.
Preferably, said unit transformer intelligence computer integrated protection also comprises time synchronized and the timing module that is used for said protective device is carried out time synchronized and timing.
Preferably, said time synchronized and timing module comprise gps receiver and elapsed time clock chip, and microcontroller 300 is from the real-time acceptance criteria time signal of gps receiver, and with time of this standard clock signal calibration elapsed time clock chip.
Preferably; Said microcontroller is also preserved the Wave data of each phase measuring voltage, electric current, protective current signal through the real-time circulating sampling of measure analog amount acquisition module; When the fault point takes place; The permanent Wave data of preserving the front and back scheduled time in the fault point moment, the timestamp of failure wave-recording and logout is confirmed by the elapsed time clock chip.
Preferably, said unit transformer intelligence computer integrated protection also comprises man-machine interaction and the information display module that is used to provide human-computer interaction interface.
Preferably, said unit transformer intelligence computer integrated protection also comprises and is used for the communication module that carries out communication with host computer or Control Network.
Can find out that from above technical scheme the utility model can obtain following technique effect: 1, replace relay logic control and realized that integrated chip replaces discrete component, can simplify system configuration with Digital Logic control; The reduction system volume, simultaneously, Digital Logic self fault point few; The life-span of digit chip is far above relay; Can significantly improve reliability, fail safe and the useful life of system, and wherein employed components and parts cost is lower, thereby has reduced system cost; 2, use special-purpose communication chip, improve the system monitoring real-time, but strengthened expanding and integration of device; 3, failure wave-recording and event recording function have been increased; 4, increased time synchronized and clocking capability, can stab for time and fault ripple provide correct time; 5, visual human-computer interaction interface is provided, has made things convenient for user inquiring and parameter tuning; 6, connect microcontroller and all digital quantities (or quantity of state) input/output module of removing analogue collection module through the photoelectricity isolated location, reduced the EVAC of external noise, improved the noise resisting ability and the reliability of whole system micro controller system.
Description of drawings
Fig. 1 is the structural representation of existing common unit transformer protective device;
Fig. 2 is the structural representation according to the unit transformer intelligence computer integrated protection of the utility model;
Fig. 3 is the exemplary circuit diagram according to the measure analog amount acquisition module of the utility model;
Fig. 4 is the exemplary circuit diagram according to the switching input module of the utility model;
Fig. 5 is the exemplary circuit diagram according to the output control module of the utility model;
Fig. 6 is used to explain the schematic diagram that carries out the zero sequence overvoltage protection according to the utility model.
Embodiment
Below, will combine accompanying drawing and embodiment that the utility model is described in detail.
(first embodiment)
Fig. 2 is the structural representation of the utility model unit transformer intelligence computer integrated protection.Shown in the part of the solid line among Fig. 2, the unit transformer intelligence computer integrated protection of this embodiment comprises measure analog amount (electric current, voltage and protective current) acquisition module 100, switching value (transformer temperature, light gas, heavy gas external signal etc.) input module 200, microcontroller 300, output control module 400, photoelectricity isolated location 500.Microcontroller 300 is connected with analogue collection module 100, switching input module 200, output control module 400 respectively.Except that measure analog amount acquisition module 100, switching input module 200 all uses photoelectricity isolated location 500 and microcontroller 300 to isolate with output control module 400.Below will describe the concrete realization of these modules.
(1) measure analog amount (electric current, voltage and protective current) acquisition module 100
Measure analog amount acquisition module 100 is gathered measurement electric current, voltage and the protective current of each phase of station transformer, and the electric current of gathering and voltage signal are sent to microcontroller 300 handles.
Fig. 3 is the exemplary circuit diagram (this figure is that transformer A simulates protection collection mutually) of measure analog amount acquisition module 100.As shown in Figure 3, measure analog amount acquisition module 100 comprises measuring voltage collection branch road (voltage transformer TV1, the first low-pass filter circuit (R11; C11)), measure current acquisition branch road (current transformer TA1, the first sample resistance R12, the second low-pass filter circuit (R13; C12)), protective current is gathered branch road (current transformer TAb1; The second sample resistance R14, the 3rd low-pass filter circuit (R15, C13)).
As shown in Figure 3, to gather in the branch road in measuring voltage, measurement voltage signal converts the small voltage signal into through voltage transformer TV1, and (R11 C11) is input to microcontroller 300 to pass through low-pass filter circuit then.In the present embodiment, microcontroller 300 adopts microcontroller dsPIC33FJ256GP710, and therefore, (R11, C11) the small voltage signal of filtering is input to the analog input channel AN0 of the AD conversion of microcontroller dsPIC33FJ256GP710 through low-pass filter circuit.
In measuring the current acquisition branch road; Measure current signal and convert little current signal into through current transformer TA1; Be transformed to the small voltage signal through sample resistance R12; (R13 C12) is input to the analog input channel AN1 of the AD conversion of microcontroller dsPIC33FJ256GP710 to pass through low-pass filter circuit then.
Gather in the branch road at protective current; The protective current signal of measuring converts the small voltage signal into through current transformer TAb1; Be transformed to the small voltage signal through sample resistance R14; (R15 C13) is input to the analog input channel AN2 of the AD conversion of microcontroller dsPIC33FJ256GP710 to pass through low-pass filter circuit then.
The AD modular converter of microcontroller dsPIC33FJ256GP710 can be sampled to 4 road signals simultaneously, and conversion respectively guarantees the synchronism that the multichannel in-phase signal is gathered, and the detailed content that AD transforms sees also the dsPIC33FJ256GP710 databook.
In the present embodiment; Choosing each following components and parts: R11, R13, R15 is 8k, and R12, R14 are 10 Ω, are 8k; C11, C12, C13 are 10nF; TV1 is TV31, and TA1 is TA21CM, and TAb1 is TA23A (voltage transformer summation current transformer details is referring to Zibo Yuanxing Electronics Co., Ltd.'s website data).
Here point out that measure analog amount Acquisition Circuit shown in Figure 3 only is exemplary, also can utilize other known components and parts to replace the corresponding element device among Fig. 3 with identical functions.
(2) switching value (transformer temperature, light gas, heavy gas external signal etc.) input module 200
Switching input module 200 is gathered external control switch amount signals, comprises transformer temperature, light gas, heavy gas external signal etc., and the external control switch amount signal of gathering is sent to microcontroller 300 through photoelectricity isolated location 500 handles.
Fig. 4 is the exemplary circuit diagram of switching input module 200.As shown in Figure 4, switching input module 200 comprises the photoelectricity isolated location U5 that is used to receive external control switch amount signal, be used to protect current-limiting resistance R51, the R52 of photoelectricity isolated location U5 and be used for the output of photoelectricity isolated location U5 is carried out the low-pass filter circuit (R53 and high-frequency filter capacitor C51) of filtering.Wherein, photoelectricity isolated location U5 adopts 6N135 (details can referring to official of U.S. Agilent company Web site query).Here, for distinguishing with photoelectricity isolated location 500 shown in Figure 2, photoelectricity isolated location U5 can be defined as the second photoelectricity isolated location.
Specifically, external control switch amount signal is passive signal (being merely on off operating mode), and its input terminal J1, J2 that is connected 6N135 is last, constitutes controlled loop.Switching value is in case be on-state; The control side Light-Emitting Diode conducting of photoelectricity isolated location U5 is luminous; Its controlled phototriode conducting high level signal that records is then delivered to the interruptive port of microcontroller dsPIC33FJ256GP710 after R53 and C51 filtering, dsPIC33FJ256GP710 handles by microcontroller.Current-limiting resistance R51 and R52 carry out current limliting to photoelectricity isolated location U5, with protection photoelectricity isolated location U5.R53 and high-frequency filter capacitor C51 carry out filtering to the high level signal of photoelectricity isolated location U5 output, and the port with protection microcontroller dsPIC33FJ256GP710 prevents the impact of high level to the microcontroller port circuit.
In the present embodiment, choosing each following components and parts: R51 is 5.1k, and R52 is 5.1k, and R53 is 8k, and C51 is 10nF, and the photoelectricity isolated location is 6N135, and Vdd is the system works power supply.
Here point out that switching value input circuit shown in Figure 4 only is exemplary, also can utilize other known components and parts to replace the corresponding element device among Fig. 4 with identical functions.
(3) microcontroller 300
In the present embodiment, as stated, the dsPIC33FJ256GP710 microcontroller (details can referring to official of company of U.S. Microstar network address) that adopts the U.S. little core company is as microcontroller 300; This microcontroller is high-performance 16 position digital signal controllers, improves Harvard structure, the C compiler framework of optimization and general input and output pin; Operating frequency reaches 200MHz; Integrated DSP function, low-work voltage, cost performance is very high.Certainly, also can adopt other the known processor that can carry out analog-to-digital conversion and digital processing or controller.
(4) output control module 400
Fig. 5 is the exemplary circuit diagram of output control module 400.As shown in Figure 5; Output control module 400 comprises and is used for the output signal of microcontroller 300 is isolated and the photoelectricity isolated location U7 that amplifies, the components and parts (R71 that is used to protect photoelectricity isolated location U7; R72 is D71) with the specific logical protection relay RLAY1 that is used for exporting according to the output signal of photoelectricity isolated location U7 said control signal.The little current signal of the low pressure that microcontroller 300 sends is isolated and amplification through photoelectricity isolated location U7, drives the specific logical protection relay and realizes the breaking-closing operating of high voltage switching device and the alarm operation of accident warning device.Here, for distinguishing with photoelectricity isolated location shown in Figure 2, photoelectricity isolated location U7 can be defined as the 3rd photoelectricity isolated location.
Specifically, R71 is the light-emitting diode current-limiting resistance, and R72 is a specific logical protection relay coil current-limiting resistance, afterflow when D71 is the coil shutoff, and U7 is photoelectricity isolated location 6N135.Output control module 500 is by the output of RLAY1 (specific logical protection relay) node, and wherein, Cont is a relay control coil, and RL1, RL2 are the relay output node.
Fig. 6 is used to explain the schematic diagram that carries out the zero sequence overvoltage protection according to the utility model.The principle of zero sequence overvoltage protection is specific as follows:
(1) when zero sequence overvoltage protection pressing plate drop into (logical value is 1), three-phase residual voltage surpass zero sequence overvoltage set point (logical value is 1), TV disconnection signal be output as 0, when TV breaking protection pressing plate drops into (logical value is 1); Microcontroller 300 is according to logic operation result 1; Through 3s time-delay output high level signal; Zero sequence overvoltage alarm signal is output as high level, drives the alarm relay coil;
(2) when zero sequence overvoltage protection pressing plate drop into (logical value is 1), three-phase residual voltage less than zero sequence overvoltage set point (logical value is 0), TV disconnection signal be output as 0, when TV breaking protection pressing plate drops into (logical value is 1); Microcontroller 300 is according to logic operation result 0; Through 3s time-delay output low level signal; Zero sequence overvoltage alarm signal is output as low level, breaks off the alarm relay coil;
(3) when TV short-term protection pressing plate does not drop into (logical value is 0), the conductively-closed of TV disconnection signal, 300 of microcontrollers are judged zero sequence pressing plate state and residual voltage signal:
A) when zero sequence overvoltage protection pressing plate drops into (logical value is 1), three-phase residual voltage above zero sequence overvoltage set point (logical value is 1); Microcontroller 300 is according to logic operation result 1; Through 3s time-delay output high level signal; Zero sequence overvoltage alarm signal is output as high level, drives the alarm relay coil;
B) when zero sequence overvoltage protection pressing plate drops into (logical value is 1), three-phase residual voltage above zero sequence overvoltage set point (logical value is 0); Microcontroller 300 is according to logic operation result 0; Through 3s time-delay output high level signal; Zero sequence overvoltage alarm signal is output as low level, breaks off the alarm relay coil;
(4) when zero sequence overvoltage protection pressing plate does not drop into, guard shield zero sequence overvoltage alarm protection, zero sequence overvoltage alarm signal is a low voltage signal always, the alarm relay coil is disconnected.
The principle of other defencive function and above-mentioned zero sequence over-voltage protecting function is similar, and therefore, the descriptions thereof are omitted.
In the present embodiment; Choosing each following components and parts: R71 is 5.1k, and R72 is 4.7k, and D71 is 1407; U7 is 6N135 for the photoelectricity isolated location, RLAY1 specific logical protection relay JHX-3F-2H (details can referring to Nanchang flood official website of relay Co., Ltd data all).
Here point out that output control circuit shown in Figure 5 only is exemplary, also can utilize other known components and parts to replace the corresponding element device among Fig. 5 with identical functions.
(5) the photoelectricity isolated location 500
In order to guarantee that microcontroller 300 can safe and reliable work, increase photoelectricity isolated location 500 between switching input module 200 and control output module 400 and microcontroller 300.Photoelectricity isolated location 500 also possesses the effect of signal amplification and shaping when guaranteeing Signal Spacing, guaranteed the accurate and reliable of microcontroller 300 outputs and input signal.
Photoelectricity isolated location 800 can adopt the photoelectric isolation module 6N135 (details can be netted data referring to official of U.S. Agilent company) of U.S. Agilent company in the present embodiment.Certainly, also can adopt other to have the components and parts of photoelectricity isolation features and signal amplification and shaping feature.
Can find out from above description, in the present embodiment, replace relay logic control with Digital Logic control; Realized that integrated chip replaces discrete component, can simplify system configuration, the reduction system volume; Simultaneously, Digital Logic self fault point few, the life-span of digit chip is far above relay; Can improve reliability, fail safe and the useful life of system significantly, and the components and parts cost is low.
(second embodiment)
Present embodiment has increased time synchronized and timing module 600 on the basis of first embodiment, to be used to provide time synchronized and clocking capability.
When concrete the realization, clock synchronization and timing module 600 can be made up of gps receiver and elapsed time clock chip.The time signal of elapsed time clock chip is as this apparatus system standard time.Gps receiver acceptance criteria time signal.Microcontroller 300 is from the real-time acceptance criteria time signal of gps receiver, and with time of this standard clock signal calibration elapsed time clock chip, synchronous with assurance device system time and standard time.
In addition, except above-mentioned main protection function and time synchronized function, microcontroller 300 also can be realized failure wave-recording and event recording function.Specifically; Microcontroller 300 is preserved the Wave data of each phase measuring voltage, electric current, protective current signal through measure analog amount acquisition module 100 real-time circulating samplings; When the fault point takes place; The permanent fault point Wave data of front and back scheduled time (for example, 15 seconds) constantly of preserving uses during in order to accident analysis.The timestamp of failure wave-recording and logout is confirmed by the elapsed time clock chip, can be accurate to 1 millisecond.
In the present embodiment, gps receiver adopts the Oncore gps receiver (details can referring to official website of Motorola Inc. data) of Motorola Inc..The elapsed time clock chip adopts the DS1307 (details can referring to Dallas official website of company data) of Dallas company.Certainly, also can adopt other to have the components and parts of similar functions.
(the 3rd embodiment)
Present embodiment has increased man-machine interaction and information display module 700 on the basis of first embodiment; Be used to provide visual human-computer interaction interface; Realize the information exchange of user and the utility model protective device, make things convenient for user inquiring and the protection setting parameter is set.
When concrete the realization, man-machine interaction and information display module 700 can be made up of LCD LCDs (comprising corresponding display driver chip) and keyboard.The LCD LCDs can provide powerful information output function, comprises that writings and image shows, and can design the multilevel menu of powerful convenient and reliable operation according to apparatus features.The user can inquire about and set the protection setting parameter through keyboard operation.
In addition; The LCD LCDs can be designed to ask display mode; Each demonstration all is to think that waking demonstration down up exports, do not having interactive operation then to close demonstration through certain time length, can practice thrift the power consumption of protective device like this; The spending of minimizing system because of showing that output time is wasted provides Monitoring Service for protective device to greatest extent.
In the present embodiment, in order to realize the easy to operate and reliability of man-machine interaction, adopt CH240128B LCDs (details can referring to river, Shenzhen avionics scarabaeidae skill Co., Ltd website data).Certainly, also can adopt other to have the components and parts of similar functions.
(the 4th embodiment)
The present invention has increased communication module 800 on the basis of first embodiment, to be used for carrying out communication with host computer or Control Network, improve the system monitoring real-time, is convenient to be integrated in the automation control system.
When concrete the realization, communication module 800 can be the dual interface that is made up of EPA and two kinds of interface modes of RS485 bus.EPA is followed the TCP/IP procotol, and RS485 uses the Modbus communications protocol.Communication module 800 can send by the job information of protection transformer to the ipc monitor system according to respective protocol, receives the control command that the ipc monitor system sends, and realizes remote control, remote measurement, remote signalling, remote regulating to station transformer.Because the use of communication module 800, make the convenient safety of management work that to control manual work transformer station on duty.
In the present embodiment; In order to realize the safe and reliable long-distance transmissions of digital signal; The RS485 interface adopts Intersel communication chip ISL485 (details can referring to official website of American I ntersel company data); The RS485 interface is applicable to the closely networking communication of serial line interface, and the EPA interface adopts, and is applicable to the communication that remote complex network constitutes.
Here point out; In above each embodiment; Photoelectricity isolated location 500 connects microcontroller 300 and all digital quantities (or quantity of state) input/output module of removing measure analog amount acquisition module 100; Thereby reduced the EVAC of external noise, improved the noise resisting ability and the reliability of whole system micro controller system.
Can find out from above description, unit transformer that the utility model provides intelligence computer integrated protection can be integrated below at least one: collection of simulant signal processing at a high speed and control chip, microcontroller, large-screen LCD and display driver chip, EPA and RS485 communication chip, clock chip, gps receiver and special virtual protection control relay etc.Handle and control chip through collection of simulant signal at a high speed; The real-time and the synchronism of multiplexed signal sampling have been realized; Simplified the control of signal multipath conversion Acquisition Circuit and acquisition logic; For accident analysis and status monitoring provide accurate data information more, improve the accuracy and the reliability of protection.Through the application of large-screen LCD and display driver chip, enriched the man-machine interface interface, can the more information service function be provided for the user scene, be easy to the custom system parameter tuning, be adapted to the defencive function of transformer under the various occasions.Through utilizing special-purpose communication chip, strengthen communication function, made things convenient for the integrated application of device in automated system.Through clock chip and gps receiver, improved the inner time accuracy of device and with the standard time synchronously, can stab for the fault point provide correct time.Through special virtual protection control relay, simplified the protection control circuit, improved the reliability of protection control.
Below with reference to accompanying drawing and embodiment the utility model is described in detail; But; Should be appreciated that the utility model is not limited to above disclosed specific embodiment, any modification based on the disclosed technical scheme of this specification all should be included in the protection range of the utility model.
Claims (9)
1. a unit transformer intelligence computer integrated protection is characterized in that, comprises measure analog amount acquisition module, switching input module, microcontroller, output control module and photoelectricity isolated location, wherein:
The photoelectricity isolated location is connected between microcontroller and switching input module and the output control module;
Measure analog amount acquisition module is used to gather measurement electric current, voltage and the protective current of each phase of station transformer, and the electric current of gathering and voltage signal are sent to microcontroller handles;
Switching input module is used to gather external control switch amount signal, and the external control switch amount signal of gathering is sent to microcontroller through the photoelectricity isolated location handles;
Microcontroller is used for converting the electric current and the voltage signal of the simulation that receives from measure analog amount acquisition module to digital quantity; And combine the external control switch amount signal of switching input module collection and the protection setting parameter of setting to carry out the logic analysis judgement, and judged result is sent to output control module as the output signal through the photoelectricity isolated location;
Output control module is used to receive the judged result of microcontroller output, it is isolated amplify high voltage switching device and the accident warning device of output with control connection station transformer and electrical network.
2. unit transformer intelligence computer integrated protection according to claim 1 is characterized in that, said measure analog amount acquisition module comprises measuring voltage collection branch road, measures current acquisition branch road and protective current collection branch road, wherein:
Measuring voltage is gathered branch road and is comprised the voltage transformer and first low-pass filter circuit, and wherein, measurement voltage signal converts the small voltage signal into through voltage transformer, is input to microcontroller through first low-pass filter circuit then;
Measure the current acquisition branch road and comprise first current transformer, first sample resistance and second low-pass filter circuit; Wherein, Measure current signal and convert little current signal into through first current transformer; Be transformed to the small voltage signal through first sample resistance, be input to microcontroller through second low-pass filter circuit then;
Protective current is gathered branch road and is comprised second current transformer, second sample resistance and the 3rd low-pass filter circuit; Wherein, Measure current signal and convert little current signal into through second current transformer; Be transformed to the small voltage signal through second sample resistance, be input to microcontroller through the 3rd low-pass filter circuit then.
3. unit transformer intelligence computer integrated protection according to claim 1; It is characterized in that said switching input module comprises and is used to receive the second photoelectricity isolated location of external control switch amount signal, the low-pass filter circuit that is used to protect the current-limiting resistance of the second photoelectricity isolated location and is used for the output of the second photoelectricity isolated location is carried out filtering.
4. unit transformer intelligence computer integrated protection according to claim 1; It is characterized in that said output control module comprises and is used for the output signal of microcontroller is isolated and the 3rd photoelectricity isolated location that amplifies, is used to the specific logical protection relay protecting the components and parts of the 3rd photoelectricity isolated location and be used for exporting according to the output signal of the 3rd photoelectricity isolated location said control signal.
5. unit transformer intelligence computer integrated protection according to claim 1 is characterized in that, also comprises the time synchronized and the timing module that are used for said protective device is carried out time synchronized and timing.
6. unit transformer intelligence computer integrated protection according to claim 5 is characterized in that said time synchronized and timing module comprise gps receiver and elapsed time clock chip,
Microcontroller (300) is from the real-time acceptance criteria time signal of gps receiver, and with time of this standard clock signal calibration elapsed time clock chip.
7. unit transformer intelligence computer integrated protection according to claim 6; It is characterized in that; Said microcontroller is also preserved the Wave data of each phase measuring voltage, electric current, protective current signal through the real-time circulating sampling of measure analog amount acquisition module; When the fault point takes place, forever preserve the Wave data of the front and back scheduled time in the fault point moment, the timestamp of failure wave-recording and logout is confirmed by the elapsed time clock chip.
8. unit transformer intelligence computer integrated protection according to claim 1 is characterized in that, also comprises the man-machine interaction and the information display module that are used to provide human-computer interaction interface.
9. unit transformer according to claim 1 intelligence computer integrated protection is characterized in that, also comprises being used for the communication module that carries out communication with host computer or Control Network.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102880159A (en) * | 2012-10-22 | 2013-01-16 | 广州三晶电气有限公司 | Switch output control method and device for variable-frequency drive |
| CN103746351A (en) * | 2013-11-26 | 2014-04-23 | 清华大学 | Power system fault alarm method considering digital substation secondary circuit signal |
| CN106253484A (en) * | 2016-09-18 | 2016-12-21 | 国网河南伊川县供电公司 | A kind of for electricity substation secondary electric power system synchronous monitoring device and method |
| CN107895930A (en) * | 2017-11-26 | 2018-04-10 | 湖北恒晶电气有限公司 | A kind of universal microcomputer protecting device of intelligent in-situ and its control method |
| CN109633250A (en) * | 2018-11-09 | 2019-04-16 | 国网浙江省电力有限公司台州供电公司 | One kind prejudging system for protection supervisory equipment terminal block current potential automatic collection in substation |
| CN111817255A (en) * | 2020-07-21 | 2020-10-23 | 昇辉控股有限公司 | Air switch collector and air switch device |
| CN116300673A (en) * | 2023-01-11 | 2023-06-23 | 广东鸿业管桩有限公司 | Device for protecting internal circuit of PLC digital quantity input module based on intermediate relay |
-
2011
- 2011-09-27 CN CN2011203836676U patent/CN202474817U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102880159A (en) * | 2012-10-22 | 2013-01-16 | 广州三晶电气有限公司 | Switch output control method and device for variable-frequency drive |
| CN103746351A (en) * | 2013-11-26 | 2014-04-23 | 清华大学 | Power system fault alarm method considering digital substation secondary circuit signal |
| CN103746351B (en) * | 2013-11-26 | 2016-05-25 | 清华大学 | Power system fault alarm method considering digital substation secondary circuit signal |
| CN106253484A (en) * | 2016-09-18 | 2016-12-21 | 国网河南伊川县供电公司 | A kind of for electricity substation secondary electric power system synchronous monitoring device and method |
| CN107895930A (en) * | 2017-11-26 | 2018-04-10 | 湖北恒晶电气有限公司 | A kind of universal microcomputer protecting device of intelligent in-situ and its control method |
| CN107895930B (en) * | 2017-11-26 | 2023-11-07 | 湖北恒晶电气有限公司 | Intelligent on-site general microcomputer protection device and control method thereof |
| CN109633250A (en) * | 2018-11-09 | 2019-04-16 | 国网浙江省电力有限公司台州供电公司 | One kind prejudging system for protection supervisory equipment terminal block current potential automatic collection in substation |
| CN111817255A (en) * | 2020-07-21 | 2020-10-23 | 昇辉控股有限公司 | Air switch collector and air switch device |
| CN116300673A (en) * | 2023-01-11 | 2023-06-23 | 广东鸿业管桩有限公司 | Device for protecting internal circuit of PLC digital quantity input module based on intermediate relay |
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