CN203204072U - Power grid harmonic on-line monitor circuit - Google Patents
Power grid harmonic on-line monitor circuit Download PDFInfo
- Publication number
- CN203204072U CN203204072U CN 201320181450 CN201320181450U CN203204072U CN 203204072 U CN203204072 U CN 203204072U CN 201320181450 CN201320181450 CN 201320181450 CN 201320181450 U CN201320181450 U CN 201320181450U CN 203204072 U CN203204072 U CN 203204072U
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- circuit
- chip microcomputer
- signal output
- singlechip
- signal input
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Abstract
The utility model discloses a power grid harmonic monitor circuit, including a singlechip, a terminal of an external power grid to be detected and a signal output terminal of an external control room. Wiring is led out from the terminal, and is connected in sequence with an AC conversion circuit and a sampling maintenance circuit, and a signal input terminal of the singlechip; a signal output terminal of the AC conversion circuit is connected to a voltage detection circuit and then connected to the signal input end of the singlechip; the signal input terminal of the singlechip is electrically connected with a keyboard the signal output terminal of the singlechip is respectively electrically connected with a display screen and a parallel I / O serial, which is successively connected to a logic circuit and a photoelectric isolating drive circuit then connected into the signal output terminal; and the singlechip is respectively externally connected with an EPROM, an EEPROM, a RAM and a serial communication interface. The circuit provided by the utility model is reasonable in structure, has high intelligent degree, and realizes real-time online monitoring on power quality of the network; and the power grid harmonic on-line monitor circuit is safe, reliable and suitable for remote base stations in the power grid.
Description
Technical field
The utility model relates to mains by harmonics on-line monitoring instrument field, specifically a kind of mains by harmonics on-line monitoring instrument circuit.
Background technology
Mains by harmonics on-line monitoring instrument is called for short harmonic wave on-line monitoring instrument, along with being widely used of power electronic equipment, nonlinear-load constantly increases, harmonic content in the electrical network also constantly rises, harmonic pollution is to power system security, stable, economical operation formation potential threat, and electric circumstance brings very big impact around giving.As: the idle deposit of power consumption system; Increase transmission line losses; Increased the additional harmonic loss of motor, made its heating, reduction of service life; Make electric energy measurement produce larger error; Cause important automatic control and protection device work with sensitivity disorderly, the phenomenon of mistake action and rejecting action increases, and causes reliability decrease etc.
Harmonic wave on-line monitoring instrument can Real-Time Monitoring and is analyzed the harmonic wave of the voltage and current of electrical network median generatrix and circuit, can provide warning to harmonic wave is out-of-limit, and by RS485 or RS232 communication interface with data upload to background monitoring system, satisfy the user to the monitoring requirement of the quality of power supply.
Along with usable range is more and more wider, indices requires more and more higher, existing mains by harmonics on-line monitoring instrument circuit complex structure, function singleness, can not well satisfy the actual needs that use, especially in comparatively remote network stations, can't in time grasp situation there.
The utility model content
The purpose of this utility model provides the high mains by harmonics on-line monitoring instrument circuit of a kind of degree rational in infrastructure, intelligent.
The technical solution of the utility model is as follows:
A kind of mains by harmonics on-line monitoring instrument circuit, include the terminals of single-chip microcomputer, external tested electrical network and the signal output part of external pulpit, it is characterized in that: draw wiring and connect successively the signal input part that is connected to single-chip microcomputer behind AC change-over circuit and the sampling hold circuit from described terminals, the signal output part of described AC change-over circuit connects the signal input part that is connected to single-chip microcomputer behind the voltage tester loop; The signal input part of described single-chip microcomputer is electrically connected with keyboard, the signal output part of single-chip microcomputer is electrically connected with respectively display screen and Parallel I/O serial ports, described Parallel I/O serial ports is connected to described signal output part after connecting successively logical circuit and photoelectric isolating driving circuit, and described single-chip microcomputer is circumscribed with respectively EPROM, EEPROM, RAM and serial communication interface.
Described mains by harmonics on-line monitoring instrument circuit, it is characterized in that: the signal input part of described single-chip microcomputer is electrically connected with the crystal oscillator frequency dividing circuit.
Described mains by harmonics on-line monitoring instrument circuit, it is characterized in that: described single-chip microcomputer is circumscribed with clock circuit.
The beneficial effects of the utility model:
The utility model circuit structure is reasonable, intelligent degree is high, adopt 16-bit single-chip processor as main control unit, the voltage harmonic information of the electrical network of Real-Time Monitoring can be shown and stores, but by the keyboard input control order, and communicate by I/O serial ports, logical circuit and photoelectric isolating driving circuit and remote control room, realized the quality of power supply of on-line real time monitoring electrical network, safe and reliable, be applicable to comparatively remote network stations.
Description of drawings
Fig. 1 is the utility model electrical block diagram.
Embodiment
Referring to Fig. 1, a kind of mains by harmonics on-line monitoring instrument circuit, include signal output part XJ, the YJ of terminals Ua, Ub, Uc and the external pulpit of single-chip microcomputer 1, external tested electrical network, draw wiring and connect successively the signal input part that is connected to single-chip microcomputer 1 behind AC change-over circuit 2 and the sampling hold circuit 3 from terminals Ua, Ub, Uc, the signal output part of AC change-over circuit 2 connects the signal input part that is connected to single-chip microcomputer 1 behind the voltage tester loop 4; The signal input part of single-chip microcomputer 1 is electrically connected with keyboard 5, the signal output part of single-chip microcomputer 1 is electrically connected with respectively display screen 6 and Parallel I/O serial ports 7, Parallel I/O serial ports 7 is connected to signal output part XJ, YJ after connecting successively logical circuit 8 and photoelectric isolating driving circuit 9, and single-chip microcomputer 1 is circumscribed with respectively EPROM10, EEPROM11, RAM12 and serial communication interface 13.
In the utility model, the signal input part of single-chip microcomputer 1 is electrically connected with crystal oscillator frequency dividing circuit 14; Single-chip microcomputer 1 is circumscribed with clock circuit 15.
Claims (3)
1. mains by harmonics on-line monitoring instrument circuit, include the terminals of single-chip microcomputer, external tested electrical network and the signal output part of external pulpit, it is characterized in that: draw wiring and connect successively the signal input part that is connected to single-chip microcomputer behind AC change-over circuit and the sampling hold circuit from described terminals, the signal output part of described AC change-over circuit connects the signal input part that is connected to single-chip microcomputer behind the voltage tester loop; The signal input part of described single-chip microcomputer is electrically connected with keyboard, the signal output part of single-chip microcomputer is electrically connected with respectively display screen and Parallel I/O serial ports, described Parallel I/O serial ports is connected to described signal output part after connecting successively logical circuit and photoelectric isolating driving circuit, and described single-chip microcomputer is circumscribed with respectively EPROM, EEPROM, RAM and serial communication interface.
2. mains by harmonics on-line monitoring instrument circuit according to claim 1, it is characterized in that: the signal input part of described single-chip microcomputer is electrically connected with the crystal oscillator frequency dividing circuit.
3. mains by harmonics on-line monitoring instrument circuit according to claim 1, it is characterized in that: described single-chip microcomputer is circumscribed with clock circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320181450 CN203204072U (en) | 2013-04-11 | 2013-04-11 | Power grid harmonic on-line monitor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320181450 CN203204072U (en) | 2013-04-11 | 2013-04-11 | Power grid harmonic on-line monitor circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203204072U true CN203204072U (en) | 2013-09-18 |
Family
ID=49148168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320181450 Expired - Fee Related CN203204072U (en) | 2013-04-11 | 2013-04-11 | Power grid harmonic on-line monitor circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203204072U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267295A (en) * | 2014-10-20 | 2015-01-07 | 国网山西省电力公司晋城供电公司 | Electric network pollution data star-shaped collection system based on PQDIF standard |
-
2013
- 2013-04-11 CN CN 201320181450 patent/CN203204072U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267295A (en) * | 2014-10-20 | 2015-01-07 | 国网山西省电力公司晋城供电公司 | Electric network pollution data star-shaped collection system based on PQDIF standard |
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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: 20130918 Termination date: 20140411 |