CN104793047A - Voltage telemetering and acquiring plate for single-phase double-sampling transformer - Google Patents
Voltage telemetering and acquiring plate for single-phase double-sampling transformer Download PDFInfo
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- CN104793047A CN104793047A CN201510209475.6A CN201510209475A CN104793047A CN 104793047 A CN104793047 A CN 104793047A CN 201510209475 A CN201510209475 A CN 201510209475A CN 104793047 A CN104793047 A CN 104793047A
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Abstract
The invention relates to an adaptive voltage telemetering and acquiring plate for a single-phase double-sampling transformer. The adaptive voltage telemetering and acquiring plate for the single-phase double-sampling transformer consists of sampling transformers, current limiting resistors, sampling resistors, a singlechip and a peripheral circuit, and is characterized in that specifications and models of all the sampling transformers are the same; and conversion, isolation and sampling voltage outputting of each phase of voltage can be carried out by matching the two sampling transformers, the current limiting resistors with different parameters and the sampling resistors with the same parameters in parallel. The voltage telemetering and acquiring plate for the single-phase double-sampling transformer is simple in structure, reliable in operation and low in power consumption.
Description
Technical field
The present invention relates to a kind of electronic devices and components, particularly a kind of single-phase two sampling transformer voltage telemetry-acquisition plate.
Background technology
The linear input range of the voltage sample transformer that the remote measurement plate in current total automation device for transformer substation adopts is generally-120V to+120V, and when electrical network generation resonance, the voltage magnitude of remote measurement plate input will meet or exceed 250V, because resonance potential, far beyond the line acquisition scope of remote measurement plate, saturated spilling occurs, the resonance busbar voltage remote measurement displayed value of supervisory control of substation background computer and scheduling station end is caused to be 0 or full value, thus lose the correct monitoring of busbar voltage, easily cause the erroneous judgement of regulation and control person or transformer station person on duty, and then delay accident treatment, cause the serious consequence that occurrence of large-area grid power blackout and primary equipment damage.On the other hand, to ensure that the size of the monomer sampling transformer of wider line acquisition scope (as-250V ~+250V) and 0.2% accuracy class is comparatively large simultaneously, due to the space that it can hold beyond remote measurement plate, thus be difficult to be applied.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of single-phase two sampling transformer voltage telemetry-acquisition plates of Width funtion line acquisition scope are provided.
The object of the present invention is achieved like this: a kind of single-phase two sampling transformer voltage telemetry-acquisition plate, be made up of sampling transformer, current-limiting resistance, sampling resistor, single-chip microcomputer and peripheral circuit thereof, it is characterized in that every phase voltage and be connected to two sampling transformers, between the former limit that the current-limiting resistance of different parameters is serially connected with transformer of sampling and phase voltage terminal; The sampling secondary of transformer is connected with the sampling resistor of identical parameters, and sampling resistor one end is connected with single-chip microcomputer, other end ground connection; Single-chip microcomputer is connected with bus.
The specifications and models of described sampling transformer are all identical.
Described single-chip microcomputer is also connected with oscillatory circuit and stabilized voltage supply.
Single-chip microcomputer can be multiple, can using one of them as host scm, or setting up a host scm, other single-chip microcomputer being responsible for voltage measurement acquisition function is from single-chip microcomputer, and host scm realizes measuring acquisition function from the precise synchronization voltage of single-chip microcomputer by interrupt mode.
Every phase voltage signal has two independently acquisition circuits, two independently acquisition circuit A/D conversion and work for the treatment of must be completed by same single-chip microcomputer, every phase voltage signal through A/D conversion after formed two data sources.
Single-chip microcomputer switches threshold values according to the linear working range setting of the two-way acquisition circuit of same phase voltage signal, and automatically select a road as primary data source by single-chip microcomputer, single-chip microcomputer carries out necessary voltage data continuity compensation deals during switch data source.
Single-chip microcomputer carries out the auto-compensation process of phase differential by software according to the family curve of sampling transformer, also have the calculating of exact value for A/D transformation result of high-precision regulated power supply in the EEPROM of single-chip microcomputer.
Host scm also communicates with host computer, uploads real-time voltage metric data, receives data collection synchronous information and the parameter configuration order of host computer.
The sampling transformer that the present invention adopts two groups to commonly use realizes Width funtion line acquisition scope by different current-limiting resistances, meets electrical network and normally runs and correctly gather with the busbar voltage under resonance accident, and structure is simple, reliable operation.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 is fundamental diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1: bus voltage signal Ua, Ub, Uc, Un are accessed by the connecting terminal block JP1 of the primary equipment voltage transformer (VT) of transformer station.Current-limiting resistance R1(56k Ω) and current-limiting resistance R2(124k Ω) one end be connected to Ua side by side, the other end of R1 is connected to the former limit of sampling transformer TF1, the secondary of TF1 is connected to sampling resistor R10(2.5k Ω), R10 one end is connected to the 3rd pin (ADC0) of single-chip microcomputer IC1, R10 other end ground connection, ADC0 is used for the A phase voltage voltage acquisition under the specified running status of electrical network, the other end of R2 is connected to the former limit of sampling transformer TF2, the secondary of TF2 is connected to sampling resistor R20(2.5k Ω), R20 one end is connected to the 4th pin (ADC1) of single-chip microcomputer IC1, R20 other end ground connection, the A phase voltage that ADC1 is used under electrical network resonant condition gathers, the data source capability threshold values that single-chip microcomputer IC1 exports A phase voltage measured value to host computer is 4.8V, namely select the A/D transformation result of ADC0 as A phase voltage measured value when R10 output voltage is less than 4.8V, select the A/D transformation result of ADC1 as A phase voltage measured value when R10 output voltage is more than or equal to 4.8V.
Current-limiting resistance R3(56k Ω) and current-limiting resistance R4(124k Ω) one end be connected to Ub side by side, the other end of R3 is connected to the former limit of sampling transformer TF3, the secondary of TF3 is connected to sampling resistor R30(2.5k Ω), R30 one end is connected to the 5th pin (ADC2) of single-chip microcomputer IC1, R30 other end ground connection, the B phase voltage that ADC2 is used under the specified running status of electrical network gathers, the other end of R4 is connected to the former limit of sampling transformer TF2, the secondary of TF2 is connected to sampling resistor R40(2.5k Ω), R40 one end is connected to the 6th pin (ADC3) of single-chip microcomputer IC1, R20 other end ground connection, ADC3 is used for the B phase voltage voltage acquisition under electrical network resonant condition, it is 4.8V that single-chip microcomputer IC1 exports B phase voltage measured value data source capability threshold values to host computer, namely select the A/D transformation result of ADC2 as B phase voltage measured value when R20 output voltage is less than 4.8V, select the A/D transformation result of ADC3 as B phase voltage measured value when R20 output voltage is more than or equal to 4.8V.
Current-limiting resistance R5(56k Ω) and current-limiting resistance R6(124k Ω) one end be connected to Uc side by side, the other end of R5 is connected to the former limit of sampling transformer TF5, the secondary of TF5 is connected to sampling resistor R50(2.5k Ω), R50 one end is connected to the 7th pin (ADC4) of single-chip microcomputer IC1, R50 other end ground connection, the C phase voltage that ADC4 is used under the specified running status of electrical network gathers, the other end of R6 is connected to the former limit of sampling transformer TF6, the secondary of TF6 is connected to sampling resistor R60(2.5k Ω), R60 one end is connected to the 7th pin (ADC5) of single-chip microcomputer IC1, R60 other end ground connection, ADC5 is used for the C phase voltage voltage acquisition under electrical network resonant condition, it is 4.8V that single-chip microcomputer IC1 exports C phase voltage measured value data source capability threshold values to host computer, namely select the A/D transformation result of ADC4 as C phase voltage measured value when R50 output voltage is less than 4.8V, select the A/D transformation result of ADC5 as C phase voltage measured value when R50 output voltage is more than or equal to 4.8V.
IC1 is STC15F408AD single-chip microcomputer, this single-chip microcomputer has 28 pins, wherein the 1st pin, the 2nd pin, the 11st pin, the 13rd pin, the 19th pin (P3.4), the 20th pin (P3.5), the 23rd pin (P2.0), the 28th pin (P2.5) are common I/O port, the present embodiment is not with unsettled (External Insulation), and on software, shield the use of these I/O ports, to reduce the impact of I/O port operation on A/D transfer process; Sampling resistor R10, R20, R30, R40, R50, R60 of 3rd pin (ADC0), the 4th pin (ADC1), the 5th pin (ADC2), the 6th pin (ADC3), the 7th pin (ADC4), the 8th pin (ADC5) voltage acquisition circuit of interface channel 1 to passage 6 are respectively connected, and wherein ADC0 and ADC1 changes for the A/D of A phase voltage signal, ADC2 and ADC3 changes for the A/D of B phase voltage signal, ADC4 and ADC5 changes for the A/D of C phase voltage signal; 9th pin (XTAL2) and the 10th pin (XTAL1) are connected to crystal oscillator Y1(18.432MHZ), electric capacity C1(20pF) and electric capacity C2(20pF) oscillating circuit that forms, namely the present embodiment adopts external clock; 12nd pin (VCC) connects 2 pin of high-precision regulated power supply IC2, this pin except the working power of single-chip microcomputer IC1 is provided simultaneously double be A/D conversion datum; 14th pin ground connection; The serial ports that 15th pin (RxD) and the 16th pin (TxD) are Transistor-Transistor Logic level, is connected to bus JP2; 17th pin (INT0) is synchronized sampling interrupting input pin, and high level is effective, is connected to bus JP2, for receiving the synchronous sampling signal that host computer is transmitted by bus; 18th pin (INT1) is look-at-me input pin, and high level is effective, not with unsettled; 21st pin (/INT2) and the 22nd pin (/INT3) are look-at-me input pin, Low level effective, not with unsettled, and on software, forbid the 18th, 21,22 pin interrupt responses, to reduce the impact of external interference on A/D transfer process; 24th pin (SCLK_2), the 25th pin (MISO_2), the 26th pin (MOSI_2), the 27th pin (SS_2) are SPI mouth, be connected to bus JP2, serial communication, by programmed control, is only changed idle period of time at A/D and is carried out, interference-free to ensure A/D transfer process.
IC2(AMS1117-5.0) be the linear stabilized voltage supply of 5V high precision, the outside constant voltage dc source of 9V is connected into 3 pin (IN) of IC2 by 1 pin of JP3 terminal, 1 pin (IN) of IC2 is 2 electric capacity C3(0.1uF in parallel over the ground) and C4(22uF) to filter for power supply clutter, 2 pin (OUT) of IC2 are connected into 12 pin (VCC) of IC1,1 pin of IC2 and the 2 pin ground connection of JP3, the actual measurement operating voltage exact value of IC2 is stored, for the calculating of A/D transformation result in the EEPROM of single-chip microcomputer IC1.
As shown in Figure 2: Ua, Ub, Uc, Un draw the voltage from substation bus bar voltage transformer secondary side, be A phase voltage, B phase voltage, C phase voltage and neutral point voltage (zero line) respectively.A phase voltage (Ua, Un) accesses passage 1 A/D converter of single-chip microcomputer through current-limiting resistance Ra1, sampling transformer TF1 and sampling resistor Ro1, accesses passage 2 A/D converter of single-chip microcomputer through current-limiting resistance Ra2, sampling transformer TF2 and sampling resistor Ro2 simultaneously; B phase voltage (Ub, Un) accesses passage 3 A/D converter of single-chip microcomputer through current-limiting resistance Rb1, sampling transformer TF3 and sampling resistor Ro3, accesses passage 4 A/D converter of single-chip microcomputer through current-limiting resistance Rb2, sampling transformer TF4 and sampling resistor Ro4 simultaneously; C phase voltage (Uc, Un) accesses passage 5 A/D converter of single-chip microcomputer through current-limiting resistance Rc1, sampling transformer TF5 and sampling resistor Ro5, accesses passage 6 A/D converter of single-chip microcomputer through current-limiting resistance Rc2, sampling transformer TF6 and sampling resistor Ro6 simultaneously.Wherein the sample model of transformer, parameter of TF1, TF2, TF3, TF4, TF5, TF6 is all identical, as DL-PT202G; Model, the parameter of sampling resistor Ro1, Ro2, Ro3, Ro4, Ro5, Ro6 are all identical, as 2.5k Ω; Ra1, Rb1, Rc1 model parameter is identical, adjusts (secondary side of primary voltage mutual inductor is 100V), as 56k Ω by electrical network rating operating voltage; Ra2, Rb2, Rc2 model parameter is identical, adjusts (secondary side of primary voltage mutual inductor is 250V), as 124k Ω by electrical network typical resonance voltage; Passage 1 A/D converter, passage 2 A/D converter, passage 3 A/D converter, passage 4 A/D converter, passage 5 A/D converter, passage 6 A/D converter are 6 A/D conversion ports on single-chip microcomputer, synchronized sampling and data processing work are completed by same a slice single-chip microcomputer, and this single-chip microcomputer is communicated with host computer (mainboard of measure and control device) by bus.
Principle of work of the present invention is: measure for A phase voltage and gather, and the no-load voltage ratio of TF1 and TF2 sampling transformer DL-PT202G is 1:1(2mA:2mA, and specified input and specified output are 2mA), saturation voltage 0.5V, maximal phase potential difference 20
', the maximum load when primary current is 2mA is 250 Ω.The secondary side of the primary voltage mutual inductor when electrical network normally runs time (declared working condition) is 100V, calculates R1=110/2*1000-250=54.75k Ω by rated voltage 10% maximum offset 110V, in conventional precision resistance model, choose 56k Ω, because when electrical network resonance occurs, ceiling voltage value range is 150V ~ 250V, therefore R2=250/2*1000-250=124.75 k Ω is calculated with 250V, 124 k Ω are chosen in conventional precision resistance model, TF2 primary current when simultaneously considering 110V is 110/124000=0.887mA, be in the optimum linear acquisition range (0.5mA ~ 2mA) of TF2, TF1 secondary sampler resistance R10 output voltage 110(V)/56.25(k Ω) * 2.5(k Ω)=4.89V, consider again line voltage lower than ratings 20% time protective device action is excised load or electrical network parallel off, as: low-voltage load sheding automatic safety device, automatic parallel off automatic safety device, therefore Operating Voltage is not less than two sub-values of 80V(primary voltage mutual inductor), so primary data source selected threshold values to adjust as 4.8V, namely when R10 output voltage is lower than 4.8V, the A phase voltage that single-chip microcomputer IC1 exports is: output voltage (the V)/2.5(k Ω of R10) * 56.25(k Ω), namely the coefficient be multiplied is 22.5, when R10 output voltage is more than or equal to 4.8V, the A phase voltage that single-chip microcomputer IC1 exports is: output voltage (the V)/2.5(k Ω of R20) * 124.25(k Ω), the coefficient be namely multiplied is 49.7.
Claims (4)
1. a single-phase two sampling transformer voltage telemetry-acquisition plate, be made up of sampling transformer, current-limiting resistance, sampling resistor, single-chip microcomputer and peripheral circuit thereof, it is characterized in that every phase voltage and be connected to two sampling transformers, between the former limit that the current-limiting resistance of different parameters is serially connected with transformer of sampling and phase voltage terminal; The sampling secondary of transformer is connected with the sampling resistor of identical parameters, and sampling resistor one end is connected with single-chip microcomputer, other end ground connection; Single-chip microcomputer is connected with bus.
2. single-phase two sampling transformer voltage telemetry-acquisition plate according to claim 1, is characterized in that the specifications and models of described sampling transformer are all identical.
3. single-phase two sampling transformer voltage telemetry-acquisition plate according to claim 1, is characterized in that described single-chip microcomputer is also connected with oscillatory circuit and stabilized voltage supply.
4. single-phase two sampling transformer voltage telemetry-acquisition plate according to claim 1, it is characterized in that described single-chip microcomputer can for multiple, can using one of them as host scm, or set up a host scm, other single-chip microcomputer being responsible for voltage measurement acquisition function is from single-chip microcomputer, and host scm realizes measuring acquisition function from the precise synchronization voltage of single-chip microcomputer by interrupt mode.
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