CN1062998A - Ac sample system of power remote station - Google Patents
Ac sample system of power remote station Download PDFInfo
- Publication number
- CN1062998A CN1062998A CN91106409A CN91106409A CN1062998A CN 1062998 A CN1062998 A CN 1062998A CN 91106409 A CN91106409 A CN 91106409A CN 91106409 A CN91106409 A CN 91106409A CN 1062998 A CN1062998 A CN 1062998A
- Authority
- CN
- China
- Prior art keywords
- voltage
- change
- resistance
- current
- microsystem
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention is an AC sample system of power remote station, belongs to electric substation's microcomputer detecting system, and the present invention realizes the direct interface of the computer and the electric power system secondary connection signal of telecommunication first, omitted to become and sent commutation system, make designs simplification, reliability improves, and has improved certainty of measurement.
Description
The present invention is an AC sample system of power remote station, belongs to electric substation's Microcomputer Detecting System.
Along with the development of microcomputer technology, the development of power automation monitoring technique is very rapid.In electric power scheduling automatization system, the Data Detection of each electric substation is the basis of dispatch automated system, so the market demand of power remote station is very big.All kinds of electric substations microcomputer detection-control equipment of at present domestic each manufacturer's development, after voltage, current signal take out respectively from voltage transformer (PT) summation current transformer (CT) of electric substation, through the secondary instrument transformer 100V interchange normal voltage being exchanged normalized current with 5A again is distributed in the transmitter, be transformed into low pressure and little electric current, become direct current signal through rectification, filtering respectively again and send into the A/D change-over circuit of microsystem and do A/D conversion.As the product of units such as Yantai Computer Company, Zibo radio three factories and Xian Electronics Science and Technology University, all be to adopt equipment input microcomputer such as transmitting system.Use to become and send device structure complexity, cost height, and exchange normal voltage and exchange normalized current after processing is sent in transmitter, a series of changes of rectifier filter, certainty of measurement is affected, it is all inconvenient to expand printing function, CRT Presentation Function and capacity extensions, transmitter precision checking and maintenance load are also very big, and expense is very high.
The present invention be intended to improve power remote equipment present situation, realize that microcomputer in electric substation's secondary connection signal of telecommunication direct interface, saves equipment such as transmitter, make designs simplification, cost reduces, reliability improves.
AC sample system of the present invention is that the resistance that connects with three groups of Y shapes is connected into the closed-loop path after making three voltage transformers that triangle connects and being in parallel with voltmeter earlier.After voltage transformer induces the interchange normal voltage of 100V from three-phase bus power frequency high voltage line, introduce on the resistance of three groups of Y shapes connections, every group of resistance has R
1R
2Form, its branch is pressed between the 100/20-100/5, be 100/9-100/6 between optimal zone, so can obtain the signal of having decayed with power frequency component frequency together and don't distortion from divider resistance, this signal is directly sent into the A/D change-over circuit of microsystem.
Same ammeter of current transformer and sample resistance R
3Be in series and constitute the closed-loop path.The interchange normalized current that current transformer induces 0-5A from the every phase bus power frequency high voltage line sample resistance of flowing through.Sample resistance R
3Span between 0.01-0.4 Ω, optimum range is 0.02-0.2 Ω, thus produce on the sample resistance with power frequency component with undistorted voltage signal of having decayed frequently, this signal code is directly sent into the A/D change-over circuit of microsystem.
The inversion frequency of the A/D change-over circuit of AC sample system of the present invention is the hundred times of power frequency component frequency, can improve certainty of measurement like this.The A/D conversion regime is to utilize software to start two-way A/D simultaneously, computer intersects reads two signals, the one road is a voltage signal, one the tunnel is associated current signal, as reading the A phase voltage signal earlier, reading the A phase current signal again, find out the zero point of two signals then, calculate the distance between two zero points, can be converted into the phase difference between u and the I.
The present invention has realized the direct interface of the computer and the electric power system secondary connection signal of telecommunication first, has omitted to become and has sent commutation system, makes designs simplification, and reliability improves, and cost reduces, and investment reduces about 50%.For the electric substation of a 110KV grade, utilize the transformation of telecontrol equipment original text to upgrade, need about 80,000 yuan of investments, utilize system of the present invention only to need 40,000 yuan and get final product.Owing to omitted transmitting system, the systematic error that causes is thus eliminated, and has improved certainty of measurement, has reduced maintenance cost.
Fig. 1 is AC sample system of power remote station figure, and wherein 1 is voltage transformer, the 2nd, and current transformer, 3,4 resistance, the 5th, voltmeter, the 6th, ammeter, the 7th, sample resistance, the 8th, high voltage bus for the connection of Y shape.Fig. 2 be ALTERNATE SAMPLING, zero point search principle figure, wherein 9 is waveform voltage signals, the 10th, current signal waveform, the 11st, data storage buffer, the 12nd, sampling interval, the 13rd, data in EMS memory cross arrangement.
Remote station AC sample system of the present invention is at Dan County, Shandong center electric substation of power supply administration installation and operation, wherein R
1Value 15K, R
2Be 1K, R
3Get 0.1 Ω, selecting change-over time for use is the AD574 chip composition A/D circuit of 25 μ, and this circuit conversion frequency is 800 times of power frequency component.
Claims (5)
1, AC sample system of power remote station, belong to electric substation's microcomputer detecting system, comprise voltage transformer, current transformer, voltmeter, ammeter, after it is characterized in that the voltage transformer that is in parallel with voltmeter becomes the three-phase bus power frequency high voltage 100V and exchanges normal voltage, this voltage is introduced on the Y shape divider resistance that is connected with voltage transformer, take out same frequently with power frequency, as not vow true decay ac voltage signal from divider resistance then, be introduced directly into the A/D change-over circuit of microsystem.The current transformer that is in series with ammeter, after the big electric current of every phase bus power frequency become the interchange normalized current of 0-5A, be introduced directly on the sample resistance that is in series with current transformer, so the ac voltage signal of generation and power frequency same frequency, undistorted decay on the sample resistance, this signal code is introduced directly into the A/D change-over circuit of microsystem.
2, the divider resistance of Y shape connection as claimed in claim 1 is characterized by voltage ratio between 100/20-100/5.
3, sample resistance as claimed in claim 1 is characterized by resistance between 0.01-0.4 Ω.
4, the A/D change-over circuit of microsystem as claimed in claim 1 is characterized by two-way A/D and utilizes software to start simultaneously, computer is intersected read two-way voltage signal and current signal, deposits in the internal memory then.
5, the A/D change-over circuit of microsystem as claimed in claim 1, be 25 μ s the change-over time that it is characterized by circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91106409A CN1062998A (en) | 1991-05-14 | 1991-05-14 | Ac sample system of power remote station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN91106409A CN1062998A (en) | 1991-05-14 | 1991-05-14 | Ac sample system of power remote station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1062998A true CN1062998A (en) | 1992-07-22 |
Family
ID=4907828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91106409A Pending CN1062998A (en) | 1991-05-14 | 1991-05-14 | Ac sample system of power remote station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1062998A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497118A (en) * | 2011-12-29 | 2012-06-13 | 杭州四达电炉成套设备有限公司 | Passive isolation sampling circuit for output direct current of three-phase rectifier bridge |
| CN101324657B (en) * | 2008-07-15 | 2012-07-18 | 国网电力科学研究院武汉南瑞有限责任公司 | Mutual inductor on-line monitoring method for transforming plant high pressure measurement |
-
1991
- 1991-05-14 CN CN91106409A patent/CN1062998A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324657B (en) * | 2008-07-15 | 2012-07-18 | 国网电力科学研究院武汉南瑞有限责任公司 | Mutual inductor on-line monitoring method for transforming plant high pressure measurement |
| CN102497118A (en) * | 2011-12-29 | 2012-06-13 | 杭州四达电炉成套设备有限公司 | Passive isolation sampling circuit for output direct current of three-phase rectifier bridge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106505882A (en) | A kind of high_voltage isolation detection control circuit of high-frequency and high-voltage power supply | |
| CN105974226A (en) | Portable power device test power source device and detection method thereof | |
| CN1062998A (en) | Ac sample system of power remote station | |
| CN209858649U (en) | Electric automobile battery charging outfit testing arrangement | |
| CN217385689U (en) | Multi-station test system and test platform | |
| CN201017252Y (en) | High precision controllable electric power | |
| CN214845426U (en) | 10 KV high-voltage supply low-voltage meter user metering secondary wiring structure | |
| CN111555167B (en) | Box-type substation and photovoltaic power generation system | |
| CN215263995U (en) | Electric energy metering accuracy on-site calibration instrument | |
| CN103954869A (en) | Cable power frequency parameter testing device based on PXI system | |
| CN112308732A (en) | Intelligent management platform for line loss of transformer area based on artificial intelligence and data interaction simulation technology | |
| CN113253155A (en) | Load testing device and method for autotransformer | |
| CN2694450Y (en) | Pressure reduction compensating unit of voltage transformer secondary circuit | |
| CN2136475Y (en) | High- and low-voltage power metering box | |
| CN206114885U (en) | Reduce device of voltage transformer secondary pressure drop | |
| CN110609192A (en) | Low-voltage primary power system parameter acquisition system | |
| CN85100829A (en) | The multichannel open-type heavy dc comparator | |
| CN217739299U (en) | Analog quantity acquisition module of comprehensive microcomputer protection device | |
| CN215066935U (en) | Open type three-phase three-wire high-voltage electric energy metering device | |
| CN216847962U (en) | Automatic test equipment for offline finished product of high-voltage distribution box of electric automobile | |
| CN220305397U (en) | Practical digital feeder terminal test fixture circuit | |
| CN104569715B (en) | A kind of method that virtual terminals of intelligent substation connection is debugged based on device experiment collection | |
| CN209151041U (en) | A kind of model of Three-phase Reactive Power Compensator applied to motor | |
| CN211955652U (en) | Power consumption measuring circuit of distribution transformer terminal and distribution transformer terminal | |
| CN216210576U (en) | Low-voltage transformer area on-line monitoring auxiliary equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |