CN201322772Y - Automatic power factor recorder - Google Patents
Automatic power factor recorder Download PDFInfo
- Publication number
- CN201322772Y CN201322772Y CNU2008202169211U CN200820216921U CN201322772Y CN 201322772 Y CN201322772 Y CN 201322772Y CN U2008202169211 U CNU2008202169211 U CN U2008202169211U CN 200820216921 U CN200820216921 U CN 200820216921U CN 201322772 Y CN201322772 Y CN 201322772Y
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- circuit
- power factor
- power
- keyboard
- recording device
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Abstract
The utility model discloses an automatic power factor recorder. A display screen (11), a mini-printer (8) and a keyboard (12) are installed on a panel (10) of a shell (9). A control circuit board for connecting the display screen (11), the mini-printer (8) and the keyboard (12) is installed in the shell (9). A plurality of electronic devices and components are connected on the circuit board to form the control circuit board. The control circuit on the control circuit board comprises a single chip microcomputer (5), a signal acquisition and processing circuit (1), a calendar clock circuit (2), a keyboard circuit (3), a display circuit (4), a watchdog/memory circuit (6) and a power supply circuit (7). The signal acquisition and processing circuit (1), the calendar clock circuit (2), the keyboard circuit (3), the display circuit (4), the watchdog/memory circuit (6) and the power supply circuit (7) are connected with the single chip microcomputer (5). The utility model has the advantages that the recorder can measure, save and digitally display power factor and frequency, the recorder can also regularly print the power factor, the corresponding date and time automatically or manually, the recorder is suitable for the power distribution line of industrial and mining enterprises, the tedious labor by the power operation and maintenance personnel to read the meter regularly is relieved, written basis is provided and effective supervision is realized.
Description
Technical field
The utility model relates to registering instrument, is specifically related to the power factor self-recording device, is applicable to that measurement, numeral show also storage automatically and print (record) single-phase 220V or three-phase four-wire system 380V distribution line power factor.
Background technology
Power factor is to concern an important indicator of operation of power networks economy, distribution equipment utilization factor and power supply quality.On macroscopic view, electric system is an asynchronous motor above 80% usefulness electric loading, it also will absorb the reactive power of hysteresis when consuming active power, thereby the power factor of himself hysteresis and on the low side, especially lower when underloading, power factor lags behind and harm on the low side: the one, power generator is played demagnetizing effect, and cause output voltage to reduce, influence line voltage; The 2nd, under meritorious certain situation, power factor is low more, and power network current is big more, and line drop and line loss are big more; The 3rd, become, controller switching equipment is limit with the electric current ability to bear, excessive reactive current makes transmitting little just fully loaded even overload when diligent, has influenced the meritorious performance of its capacity.In order to reduce the reactive current of electrical network, require electricity consumption department to power factor in time, local compensation.Therefore power factor becomes especially industrial and mining enterprises' important parameter measuring often, write down and regularly report of power department requirement user, and as an important indicator of enterprise's examination.Power factor meter is the compass and the weathervane of power factor height and compensation rate size.Yet the electronic pin instrument that means is mostly adopted in the measurement of power factor for a long time, and precision is lower and do not possess automatic recording function, needs each shift electrician of transformer station of enterprise timing meter reading record and compensates.Because power department lacks effective surveillance and control measure, add that some enterprise puts the national grid interests in ignoring, unsound or the operation maintenance personnel of compensation equipment are lacking in responsibility, can not in time compensate with low excessively power factor operation for a long time, the false entry in order to evade punishment is sustained a great loss power resource.
Summary of the invention
The purpose of this utility model is: a kind of power factor self-recording device is provided, this registering instrument automatic real-time measurement, digital demonstration, storage and timed print power factor and corresponding date, time, alleviate the loaded down with trivial details work of operation power maintainer timing meter reading, strengthen effective supervision.
The technical scheme that its technical matters that solves the utility model adopts is: this registering instrument comprises housing, mini-printer and control circuit board, display screen, mini-printer and keyboard are installed on the panel of housing, the control circuit board that connects display screen, mini-printer and keyboard is installed in the housing, connect each electronic devices and components and form control circuit board on circuit board, the control circuit on it connects signal acquisition processing circuit, calendar clock circuit, keyboard circuit, display circuit, house dog/memory circuitry and power circuit by single-chip microcomputer and forms.
Wherein, signal acquisition processing circuit: gather line voltage distribution, current signal respectively by voltage sensor Hv, current sensor Hi; Serve as the amplification of voltage and current signal by double operational LM358; Dual comparator LM393 constitutes zero-crossing comparator, sine wave signal is converted into the square wave of same-phase, same frequency; Be connected into 4 frequency dividers by double D trigger 74HC74; Be connected into and door by diode D1, D2, constitute the timing gate.
Wherein, the calendar clock circuit: calendar, clock circuit adopt the DS1302 chip, this chip can be distinguished the large and small moon, non-leap year, leap year, the charged pool accessory power supply, and has a battery charging management function, month data of power down can not lost, and this circuit is used to provide date, the temporal information of power factor record.
Wherein, keyboard circuit: contain calendar, clock setting key and printing key, calendar, clock setting key are used to proofread calendar, clock and set the time interval of printing automatically; The power factor historical data that printing key writes down in the print memory at any time.
Wherein, display circuit: display circuit is connected to form by two MAX7219 chips and two groups of LED charactrons, is used for showing in real time power factor, frequency and Alternation Display date, time.
Wherein, single-chip microcomputer: adopt the AT89S51 chip, realize whole registering instrument measurement, show, print control and management.
Wherein, house dog/memory circuitry: adopt the X5045 chip, be used for microcomputer monitoring, prevent to crash; The power factor value of 24 hour time period of storage and corresponding date temporal information are transferred to printer prints automatically in the time of 0, then store the data of next day.
Wherein, power circuit: through transformer step-down, rectification, filtering, three terminal integrated voltage stabilizer 7805 voltage stabilizings get the 5V stabilized power source, are the registering instrument power supply.
Gather line voltage distribution and current signal by precision voltage sensor and current sensor at first respectively, through amplification, zero-crossing comparator sine wave is changed into square wave, mistiming and leading, lagged relationship by both phase places of single chip computer measurement, calculate phase angle, and then try to achieve power factor and symbol; Meanwhile single-chip microcomputer writes down cycle, calculated rate; Send the charactron demonstration after data acquisition is finished, store and print by the time of setting.
The beneficial effects of the utility model are: 1, be that core is measured in real time to power factor and frequency with the single-chip microcomputer, the precision height, intuitive display is eye-catching, not only can expand the function of conventional power factor table, and have the advantage that body is light in a small amount, cost performance is high, significant for the technical progress of the digitizing, intellectuality, robotization and the electrical management that promote the power test instrument; 2, automatic time typing also can manually at any time be printed the loaded down with trivial details work that can alleviate operation power maintainer timing meter reading greatly, adopt power department paper roll that allot, that have special-purpose signature to print simultaneously, can stop to forge, written foundation is provided, realize effectively supervision; 3, power factor meter and frequency meter are united two into one, increase function, improve cost performance.
Description of drawings
Fig. 1 is that circuit of the present utility model constitutes and signal flow graph.
Fig. 2 is a signal waveforms.
Fig. 3 is circuit theory diagrams of the present utility model.
Fig. 4 is an outside drawing of the present utility model.
Among the figure: 1 signal acquisition processing circuit, 2 calendar clock circuit, 3 keyboard circuits, 4 display circuits, 5 single-chip microcomputers, 6 house dogs/memory circuitry, 7 power circuits, 8 mini-printers, 9 housings, 10 panels, 11 display screens, 12 keyboards.
Embodiment
Shown in Fig. 1-4, this registering instrument comprises housing 9, mini-printer 8 and control circuit board, display screen 11, mini-printer 8 and keyboard 12 are installed on the panel 10 of housing 9, the control circuit board that connects display screen 11, mini-printer 8 and keyboard 12 is installed in the housing 9, connect each electronic devices and components and form control circuit board on circuit board, the control circuit on it connects signal acquisition processing circuit 1, calendar clock circuit 2, keyboard circuit 3, display circuit 4, house dog/memory circuitry 6 and power circuit 7 by single-chip microcomputer 5 and forms.
Wherein, signal acquisition processing circuit: gather line voltage distribution, current signal respectively by voltage sensor Hv, current sensor Hi; Serve as the amplification of voltage and current signal by double operational LM358; Dual comparator LM393 constitutes zero-crossing comparator, sine wave signal is converted into the square wave of same-phase, same frequency; Be connected into 4 frequency dividers by double D trigger 74HC74; Be connected into and door by diode D1, D2, constitute the timing gate.
Wherein, the calendar clock circuit: calendar, clock circuit adopt the DS1302 chip, this chip can be distinguished the large and small moon, non-leap year, leap year, the charged pool accessory power supply, and has a battery charging management function, month data of power down can not lost, and this circuit is used to provide date, the temporal information of power factor record.
Wherein, keyboard circuit: contain calendar, clock setting key and printing key, calendar, clock setting key are used to proofread calendar, clock and set the time interval of printing automatically; The power factor historical data that printing key writes down in the print memory at any time.
Wherein, display circuit: display circuit is connected to form by two MAX7219 chips and two groups of LED charactrons, is used for showing in real time power factor, frequency and Alternation Display date, time.
Wherein, single-chip microcomputer: adopt the AT89S51 chip, realize whole registering instrument measurement, show, print control and management.
Wherein, house dog/memory circuitry: adopt the X5045 chip, be used for microcomputer monitoring, prevent to crash; The power factor value of 24 hour time period of storage and corresponding date temporal information are transferred to printer prints automatically in the time of 0, then store the data of next day.
Wherein, power circuit: through transformer step-down, rectification, filtering, three terminal integrated voltage stabilizer 7805 voltage stabilizings get the 5V stabilized power source, are the registering instrument power supply.
Gather line voltage distribution and current signal by voltage sensor Hv and current sensor Hi at first respectively, relatively the back sine wave is changed into square wave (shaping) through operational amplifier amplification, zero-crossing comparator separately, oscillogram as shown in Figure 2; Voltage wave after the shaping meets the interrupt source INTO of single-chip microcomputer; Current wave one tunnel after the shaping connects the P3.6 pin of single-chip microcomputer, is used to detect the high-low level of current wave; Another road connects the end by the timing gate that constitutes with door, and the output terminal of timing gate connects the T1 counter of single-chip microcomputer; If the clock frequency of single-chip microcomputer is f
0, then the ALE of single-chip microcomputer end is f with output frequency
0/ 6 pulse signal through external circuit 4 frequency divisions, obtains f again
0/ 24 time-base signal f
s, time-base signal connects the other end of timing gate; Because the clock frequency of single-chip microcomputer is accurate and stable, so f
sAlso be accurate and stable, can be used as time-base signal, and if only if when current wave is high level, open by the timing gate that constitutes with door, the time main pulse signal f
sArrive the counter T1 of single-chip microcomputer, can calculate the time t of current wave high level by the pulse number of record time-base signal; In the program design, the negative edge of voltage wave triggers INTO and interrupts, and starts timer internal T0 timing and begins, and with record semiperiod time T i, is used for calculated rate simultaneously; Start the step-by-step counting of internal counter T1 to time-base signal; Detect the high-low level of current wave, if high level then electric current lag behind voltage, power factor is got "+" number, otherwise gets "-" number; When voltage wave uprises level, stop T0 timing, T1 counting, calculate phase angle (φ=180t/Ti), obtain power factor value then by look-up routine.
Claims (8)
1. power factor self-recording device, it is characterized in that: this registering instrument comprises housing (9), mini-printer (8) and control circuit board, go up installation display screen (11) at the panel (10) of housing (9), mini-printer (8) and keyboard (12), install in the housing (9) and connect display screen (11), the control circuit board of mini-printer (8) and keyboard (12), connect each electronic devices and components and form control circuit board on circuit board, the control circuit on it connects signal acquisition processing circuit (1) by single-chip microcomputer (5), calendar clock circuit (2), keyboard circuit (3), display circuit (4), house dog/memory circuitry (6) and power circuit (7) are formed.
2. power factor self-recording device according to claim 1 is characterized in that: signal acquisition processing circuit: gather line voltage distribution, current signal respectively by voltage sensor Hv, current sensor Hi; Serve as the amplification of voltage and current signal by double operational LM358; Dual comparator LM393 constitutes zero-crossing comparator, sine wave signal is converted into the square wave of same-phase, same frequency; Be connected into 4 frequency dividers by double D trigger 74HC74; Be connected into and door by diode D1, D2, constitute the timing gate.
3. power factor self-recording device according to claim 1, it is characterized in that: the calendar clock circuit: calendar, clock circuit adopt the DS1302 chip, this chip can be distinguished the large and small moon, non-leap year, leap year, the charged pool accessory power supply, and has a battery charging management function, month data of power down can not lost, and this circuit is used to provide date, the temporal information of power factor record.
4. power factor self-recording device according to claim 1 is characterized in that: keyboard circuit: contain calendar, clock setting key and printing key, calendar, clock setting key are used to proofread calendar, clock and set the time interval of printing automatically; The power factor historical data that printing key writes down in the print memory at any time.
5. power factor self-recording device according to claim 1 is characterized in that: display circuit: display circuit is connected to form by two MAX7219 chips and two groups of LED charactrons, is used for showing in real time power factor, frequency and Alternation Display date, time.
6. power factor self-recording device according to claim 1 is characterized in that: single-chip microcomputer: adopt the AT89S51 chip, realize whole registering instrument measurement, show, print control and management.
7. power factor self-recording device according to claim 1, it is characterized in that: house dog/memory circuitry: adopt the X5045 chip, be used for microcomputer monitoring, prevent to crash, the power factor value of 24 hour time period of storage and corresponding date temporal information, automatically transfer to printer prints in the time of 0, then store the data of next day.
8. power factor self-recording device according to claim 1 is characterized in that: power circuit: through transformer step-down, rectification, filtering, three terminal integrated voltage stabilizer 7805 voltage stabilizings get the 5V stabilized power source, are the registering instrument power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202169211U CN201322772Y (en) | 2008-12-11 | 2008-12-11 | Automatic power factor recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202169211U CN201322772Y (en) | 2008-12-11 | 2008-12-11 | Automatic power factor recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201322772Y true CN201322772Y (en) | 2009-10-07 |
Family
ID=41160151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202169211U Expired - Fee Related CN201322772Y (en) | 2008-12-11 | 2008-12-11 | Automatic power factor recorder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201322772Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478900A (en) * | 2017-08-11 | 2017-12-15 | 黎明职业大学 | A kind of AC power power factor isolation detection interface circuit |
| CN110702967A (en) * | 2019-10-22 | 2020-01-17 | 福建锋冠科技有限公司 | Intelligent power utilization online monitoring system |
-
2008
- 2008-12-11 CN CNU2008202169211U patent/CN201322772Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478900A (en) * | 2017-08-11 | 2017-12-15 | 黎明职业大学 | A kind of AC power power factor isolation detection interface circuit |
| CN110702967A (en) * | 2019-10-22 | 2020-01-17 | 福建锋冠科技有限公司 | Intelligent power utilization online monitoring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091007 Termination date: 20100111 |