CN203069664U - Three-phase capacitance divider measuring device - Google Patents
Three-phase capacitance divider measuring device Download PDFInfo
- Publication number
- CN203069664U CN203069664U CN 201320054015 CN201320054015U CN203069664U CN 203069664 U CN203069664 U CN 203069664U CN 201320054015 CN201320054015 CN 201320054015 CN 201320054015 U CN201320054015 U CN 201320054015U CN 203069664 U CN203069664 U CN 203069664U
- Authority
- CN
- China
- Prior art keywords
- voltage
- signal
- gear
- input end
- phase capacitance
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses a three-phase capacitance divider measuring device connected with the high-voltage side of transformer equipment, which comprises a first divider arm, a second divider arm and a measuring host. The measuring host comprises a first resistor, a second resistor, a shift switching amplifying unit, a filtering unit and a control unit. The control unit comprises a digital-to-analog converter. The three-phase capacitance divider measuring device also comprises a display unit composed of a display and a keyboard. According to the utility model, a standard capacitor designed especially for the induced over-voltage withstand test on a neutral-point-free output distribution transformer is adopted by the three-phase capacitance divider measuring device, so that the device is high in input impedance and stable in capacity. Meanwhile, the device is controlled by a microcomputer and can be used for measuring the three-phase voltage and the three-phase frequency at the same time. The online application and the automatic control of the device are also realized. Meanwhile, the three-phase capacitance divider measuring device also has the advantages of simple and convenient usage, stable performance and good repeatability.
Description
Technical field
The utility model relates to a kind of measurement mechanism, particularly a kind of three phase capacitance partial pressure measuring apparatus.
Background technology
Along with the develop rapidly of power industry, the dielectric strength of electrical equipment, the superpotential limit levels of system become increasingly conspicuous to the influence of security of system economical operation.The three-phase distribution transformer is the key equipment in the electric system, to the three-phase distribution transformer carry out the frequency multiplication induced over voltage withstand test can help the related work personnel in time the discovering device Insulation Problems in order to avoid cause serious consequence.
When the three-phase distribution transformer is carried out the frequency multiplication induced over voltage withstand test, generally just according to the transformer transformation ratio, the voltage swing that puts on low-pressure side by variable-frequency power sources goes to calculate the theoretical value of high side voltage, but can there be deviation in actual trial voltage because distribution parameter and holding rises influence and the theoretical value of effect etc., for accurate detection limit check high-tension electricity, can monitor in real time with voltage divider in the high-pressure side of three-phase transformer.But present high-voltage bleeder all is single-phase work, particularly when measuring the transformer of no neutral point output, can't adopt three traditional single-phase voltage-dividing devices to monitor three-phase voltage simultaneously.
The utility model content
It is a kind of for the three phase capacitance partial pressure measuring apparatus of measuring no neutral point output distribution transformer that the purpose of this utility model is to provide, and measures host computer control dividing potential drop electric capacity by adopting, and overcome the deficiency in the conventional art, thereby realized the purpose of this utility model.
The technical matters that the utility model solves can realize by the following technical solutions:
A kind of three phase capacitance partial pressure measuring apparatus is used for measuring no neutral point output distribution transformer equipment, and the high-pressure side of transformer equipment is provided with A, B, three ends of C successively; This device comprises:
The second fen pressure arm that is serially connected with first fen pressure arm of first voltage divider and is serially connected with second voltage divider, first, second voltage divider is used for the signal dividing potential drop, wherein:
The input end of first fen pressure arm is connected in series with the A of transformer equipment end, and output terminal is connected with a first input end of measuring main frame;
The input end of second fen pressure arm is connected in series with the C of transformer equipment end, and input end is connected with second input end of measuring main frame;
The B end ground connection of transformer equipment;
The measurement main frame comprises:
Be serially connected in first resistance of first input end, and second resistance that is serially connected in second input end, first, second resistance is used for the signal through first, second voltage divider is carried out voltage sampling;
The gear switch multiplying arrangement, this device is by receiving instruction with the handover measurement gear, and this gear switch multiplying arrangement also comprises an amplifying circuit, and the signal that is used for the gear switch multiplying arrangement is exported amplifies;
Filter, it is connected with the gear switch multiplying arrangement, is used for carrying out filtering through amplified signal;
Control module, it is gathered two paths of signals respectively, according to the signal that collects the gear switch multiplying arrangement is sent instruction and makes its handover measurement gear; This control module also comprises a digital to analog converter, is used for filtered signal is carried out digital-to-analog conversion to generate measurement data.
Display device, its input end is connected with control module, and this display device comprises a display and a keyboard, and display is used for showing measurement data; Control module to the keyboard timing scan to read the operation of keyboard;
In a preferred embodiment of the present utility model, voltage divider is for adopting the standard capacitor divider of coaxial configuration, and its inside is filled with SF6 gas, and the upper end is provided with tensimeter and the air valve in order to observe.
In a preferred embodiment of the present utility model, the gear switch multiplying arrangement specifically is provided with four kinds and measures gear, and this measurement mechanism comprises two-way voltage gear commutation circuit, respectively the two paths of signals from voltage divider is handled; Voltage gear commutation circuit comprises an OPA2277 integrated package and a CD4053 integrated package, and wherein the OPA2277 integrated package is used for amplification voltage signal, and the CD4053 integrated package is used for receiving instruction and handover measurement gear.
In a preferred embodiment of the present utility model, filter is specially a second-order low-pass filter.
In a preferred embodiment of the present utility model, the MCU that it is C8051F060 that control module is specially a model.
In a preferred embodiment of the present utility model, MCU comprises a level shift circuit, is used for before the digital-to-analog conversion of carrying out signal signal being carried out electrical level shift processing.
The beneficial effects of the utility model are:
Special in the no neutral point output distribution transformer induction pressure test of employing designs, the employing standard capacitor, the input impedance height, electric capacity is stable; This device can be measured three-phase voltage and frequency simultaneously, adopts microcomputer control, and can onlinely use, and realizes control automatically; Easy to use, stable performance, good reproducibility.
Description of drawings
Fig. 1 is the utility model systematic schematic diagram in the specific implementation.
The structural representation of the capacitive divider that Fig. 2 adopts in the specific implementation for voltage divider described in the utility model.
The schematic diagram of the capacitive divider that Fig. 3 adopts in the specific implementation for voltage divider described in the utility model.
Fig. 4 is gear switch multiplying arrangement described in the utility model circuit diagram in the specific implementation.
The circuit diagram of the second-order low-pass filter that Fig. 5 adopts in the specific implementation for filter described in the utility model.
The circuit diagram of the MCU main control part that Fig. 6 adopts in the specific implementation for control module described in the utility model.
Fig. 7 is level shift circuit described in the utility model circuit diagram in the specific implementation.
Fig. 8 is keyboard described in the utility model circuit diagram in the specific implementation.
Fig. 9 is display described in the utility model circuit diagram in the specific implementation.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the utility model.
As shown in Figure 1, the connected mode of substation transformer equipment 50 connects for the triangle of no neutral point output, the high-pressure side of substation transformer equipment 50 upper ends is provided with A, B, three ends of C successively, the input end of first fen pressure arm 100 is connected with the A end, the input end of second fen pressure arm 200 is connected with the B end, wherein first fen pressure arm 100 is provided with first voltage divider 110, pressure arm 200 was provided with second voltage divider 210 in second minute, first, second minute pressure arm 100,200 output terminal respectively with measure main frame 60 and be connected; Wherein the output terminal of first voltage divider 110 is connected in series with first resistance 120, and the output terminal of second voltage divider 210 is connected in series with second resistance 220, and first, second resistance 120,220 are connected in series with the input end of gear switch multiplying arrangement 300 respectively; The input end of wave filter 400 is connected with the output terminal of gear switch multiplying arrangement 300, and its output terminal is connected with the input end of control module 500; The input end of display device 600 is connected in series with the output terminal of control module 500, and wherein display device 600 also comprises keyboard 610 and LCD 620.
After first, second voltage divider 100 of two paths of signals process, 210 dividing potential drops, carry out voltage sampling by first, second resistance 120,220 respectively, import gear switch multiplying arrangement 300 again.
As shown in Figure 4, gear switch multiplying arrangement 300 comprises two-way voltage gear commutation circuit 310,320, and first, second resistance 120 of flowing through respectively, 220 signal flow into this two-way circuit respectively; Comprise CD4053 integrated package 311,321 and OPA2277 integrated package 312,322 in the two-way voltage gear commutation circuit 310,320 respectively, wherein:
CD4053 integrated package 311,321 selections that are used for measuring gear, this integrated package comprises three groups of single-pole double-throw switch (SPDT)s, it is selective to be provided with four kinds of gears, specifically selects which gear to be decided by the input code of control module 500 these integrated packages of control;
OPA2277 integrated package 312,322 is used for amplifying signal, comprises two discharge circuits in this integrated package, after CD4053 integrated package 311,321 is determined gear, before signal output gear switch multiplying arrangement 300 signal is amplified.
As shown in Figure 5, wave filter 400 is a second-order low-pass filter, and the signal after amplifying from the two-way of gear switch multiplying arrangement 300 output flows into and carries out filtering and handle from two input ends 410,420 of wave filter 400 respectively; Resistance in the wave filter 400, capacitance parameter can be adjusted in advance, handle thereby signal is carried out filtering, produce aliasing effect when avoiding signal to enter control module 500.
As shown in Figure 6, control module 500 is that a model is the system type MCU of C801F060, and it has following characteristics:
(1) kernel adopts pipeline organization, and speed can reach 25MIPS (25MHz crystal oscillator), fast 10 times than 51 common single-chip microcomputers; Its instruction and standard series 51 single-chip microcomputer compatibilities, thereby it is very easy to grasp performance history; The JTAG debud mode of this chip be supported in system, at full speed, non-insertion debugging and programming, and do not take resource in the sheet;
(2) be integrated with on the sheet power monitoring in programmable-gain ADC, the 8 path 10 position 200kSPS programmable-gain ADC of 64kB Flash, 4352B internal RAM (256+4kB can extend out to 64kB), 59 I/O mouths, 16 1MSPS of 2 passages, 2 tunnel 12 DAC, No. 3 analog comparators, internal voltage reference and the sheets, step-down detects and functions such as house dog.Because the high integration of C8051F060 need not to extend out ROM, RAM, AD, DA, watchdog, programmable I/O mouth and EEPROM (realizing with Flash in the sheet).
The filtered signal of process enters MCU by port 510,520 and is gathered by MCU, is provided with a D/A converting circuit among the MCU, is used for and will be converted into digital signal through filtered simulating signal; Because this digital to analog converter is the unipolarity input, before signal enters D/A converting circuit, signal need be done electrical level shift processing.
Signal will be earlier by a level shift circuit, as shown in Figure 7, simulating signal enters from port 530,540, and the voltage U r of its middle-end 550 is reference voltage, the voltage U i of end 530,540 is the bipolarity input voltage, and the voltage U o of end 531,541 is the output voltage through displacement.When resistance reaches balance, Uo=Ui-Ur, Ur imports a DC reference voltage, as dc offset voltage, makes output voltage U o satisfy the input voltage range requirement of D/A converting circuit.
Signal enters D/A converting circuit and generates measurement data, and be input to display device 600. by MCU after handling through level shift circuit
As Fig. 8 and shown in Figure 9, display device 600 is provided with keyboard 610 and LCD 620, and display device 600 is input to the MCU bus with all button operations, and it adopts the timing scan mode to read the operation of keyboard 610.
MCU sends the mode of content displayed by bus to LCD 620.
During practical operation, after the low-pressure side of substation transformer equipment input certain voltage, obtain corresponding induced voltage in the high-pressure side, B end ground connection with transformer, A, the C end is respectively with first, pressure arm 100 in second minute, 200 connect, just obtain the two-way voltage signal, after the two paths of signals dividing potential drop, 60 pairs of signals of measurement main frame are taken a sample and are selected to measure accordingly gear, by signal is amplified, filtering, generate measurement data after level shift and the digital-to-analog conversion, be presented on the LCD 620, the user can obtain measuring the voltage measurement data of substation transformer equipment 50 intuitively by LCD 620, and measures operation by keyboard 610.
This device accepted standard capacitive divider has been optimized inner structure, overall weight little and shell bearing capacity and advantages of good shielding performance, and antijamming capability is strong; Because this voltage divider inside is inflatable structure, and is affected by environment less, and convenient later maintenance, highly versatile;
Moreover it is available that the gear switch multiplying arrangement 300 that this device adopts is provided with four kinds of gears, satisfied the amplification needs of electric signal.
Moreover the LCD 620 of display device 600 has the good man-machine interaction interface, and as long as the client is by the screen prompt information operating.
This device can be measured three-phase voltage and frequency simultaneously, and can onlinely use, and realizes control automatically, and is easy to use, stable performance, good reproducibility.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (6)
1. a three phase capacitance partial pressure measuring apparatus is used for measuring no neutral point output distribution transformer equipment, and the high-pressure side of transformer equipment is provided with A, B, three ends of C successively; It is characterized in that this device comprises:
The second fen pressure arm that is serially connected with first fen pressure arm of first voltage divider and is serially connected with second voltage divider, described first, second voltage divider is used for the signal dividing potential drop, wherein:
The input end of described first minute pressure arm is connected in series with the A of described transformer equipment end, and output terminal is connected with a first input end of measuring main frame;
The input end of described second minute pressure arm is connected in series with the C of described transformer equipment end, and input end is connected with second input end of described measurement main frame;
The B end ground connection of described transformer equipment;
Described measurement main frame comprises:
Be serially connected in first resistance of described first input end, and second resistance that is serially connected in described second input end, described first, second resistance is used for the signal through first, second voltage divider is carried out voltage sampling;
The gear switch multiplying arrangement, this device is by receiving instruction with the handover measurement gear, and this gear switch multiplying arrangement also comprises an amplifying circuit, and the signal that is used for described gear switch multiplying arrangement is exported amplifies;
Filter, it is connected with the gear switch multiplying arrangement, is used for carrying out filtering through amplified signal;
Control module, it is gathered two paths of signals respectively, according to the signal that collects described gear switch multiplying arrangement is sent instruction and makes its handover measurement gear; This control module also comprises a digital to analog converter, is used for filtered signal is carried out digital-to-analog conversion to generate measurement data;
Display device, its input end is connected with described control module, and this display device comprises a display and a keyboard, and described display is used for showing measurement data; Described control module to described keyboard timing scan to read the operation of keyboard.
2. a kind of three phase capacitance partial pressure measuring apparatus as claimed in claim 1 is characterized in that, described voltage divider is for adopting the standard capacitor divider of coaxial configuration, and its inside is filled with SF6 gas, and the upper end is provided with tensimeter and the air valve in order to observe.
3. a kind of three phase capacitance partial pressure measuring apparatus as claimed in claim 1, it is characterized in that, described gear switch multiplying arrangement specifically is provided with four kinds and measures gear, and this measurement mechanism comprises two-way voltage gear commutation circuit, respectively the two paths of signals from voltage divider is handled; Described voltage gear commutation circuit comprises an OPA2277 integrated package and a CD4053 integrated package, and wherein the OPA2277 integrated package is used for amplification voltage signal, and the CD4053 integrated package is used for receiving instruction and handover measurement gear.
4. a kind of three phase capacitance partial pressure measuring apparatus as claimed in claim 1 is characterized in that, described filter is specially a second-order low-pass filter.
5. a kind of three phase capacitance partial pressure measuring apparatus as claimed in claim 1 is characterized in that the MCU that it is C8051F060 that described control module is specially a model.
6. a kind of three phase capacitance partial pressure measuring apparatus as claimed in claim 5 is characterized in that described MCU comprises a level shift circuit, is used for before the digital-to-analog conversion of carrying out signal signal being carried out electrical level shift processing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320054015 CN203069664U (en) | 2013-01-31 | 2013-01-31 | Three-phase capacitance divider measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320054015 CN203069664U (en) | 2013-01-31 | 2013-01-31 | Three-phase capacitance divider measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203069664U true CN203069664U (en) | 2013-07-17 |
Family
ID=48768436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320054015 Expired - Fee Related CN203069664U (en) | 2013-01-31 | 2013-01-31 | Three-phase capacitance divider measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203069664U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103941208A (en) * | 2014-03-31 | 2014-07-23 | 国家电网公司 | Method and device for calibrating high-voltage charged display |
| CN103969499A (en) * | 2013-01-31 | 2014-08-06 | 山东电力集团公司物资供应公司 | Three-phase capacitor voltage division measuring device and method |
| CN109342827A (en) * | 2018-11-22 | 2019-02-15 | 湖南恩智测控技术有限公司 | A kind of circuit and method exchanging charge and discharge electrical measurement capacitance by capacitor |
| CN113433382A (en) * | 2021-08-26 | 2021-09-24 | 南方电网数字电网研究院有限公司 | Three-phase voltage measuring method, circuit and equipment |
-
2013
- 2013-01-31 CN CN 201320054015 patent/CN203069664U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969499A (en) * | 2013-01-31 | 2014-08-06 | 山东电力集团公司物资供应公司 | Three-phase capacitor voltage division measuring device and method |
| CN103969499B (en) * | 2013-01-31 | 2016-08-10 | 山东电力集团公司物资供应公司 | A kind of three phase capacitance partial pressure measuring apparatus and measuring method |
| CN103941208A (en) * | 2014-03-31 | 2014-07-23 | 国家电网公司 | Method and device for calibrating high-voltage charged display |
| CN103941208B (en) * | 2014-03-31 | 2017-01-18 | 国家电网公司 | Method and device for calibrating high-voltage charged display |
| CN109342827A (en) * | 2018-11-22 | 2019-02-15 | 湖南恩智测控技术有限公司 | A kind of circuit and method exchanging charge and discharge electrical measurement capacitance by capacitor |
| CN109342827B (en) * | 2018-11-22 | 2024-03-29 | 湖南恩智测控技术有限公司 | Circuit and method for measuring capacitance value through capacitance alternating current charge and discharge |
| CN113433382A (en) * | 2021-08-26 | 2021-09-24 | 南方电网数字电网研究院有限公司 | Three-phase voltage measuring method, circuit and equipment |
| CN113433382B (en) * | 2021-08-26 | 2021-12-17 | 南方电网数字电网研究院有限公司 | Three-phase voltage measuring method, circuit and equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104198867B (en) | Detection Apparatus and method for for arc light protecting device | |
| CN203069664U (en) | Three-phase capacitance divider measuring device | |
| CN106772208B (en) | Single three-phase meter integrated reliability test board | |
| CN101839931B (en) | Alternating current signal measurement device, system and method | |
| CN102128984A (en) | Comprehensive tester of programmable power supply insulation resistance and earthed resistance | |
| CN106771632A (en) | Multi-channel DC resistance meter | |
| CN203069685U (en) | Comprehensive test instrument for capacitor or inductor switching test | |
| CN103176066A (en) | Digitization power quality monitoring device | |
| CN204101671U (en) | A kind of Novel multi-core cable tester | |
| CN108535575A (en) | Power quality analysis device based on short-distance wireless communication technology | |
| CN202372592U (en) | Electric energy quality monitoring instrument | |
| CN201965224U (en) | Automatic school system that examines of proof voltage instrument | |
| CN207181531U (en) | A kind of three phase capacitance electric inductance measuring-testing instrument | |
| CN2569162Y (en) | Device for live detecting resistant current of three phase lighting arrestor | |
| CN202649455U (en) | Embedded accuracy tester for current transformer | |
| CN103969499B (en) | A kind of three phase capacitance partial pressure measuring apparatus and measuring method | |
| CN204330849U (en) | A kind of Multi-function experimental virtual instrument | |
| CN201926710U (en) | Programmable power supply insulation resistance and grounding resistance comprehensive test instrument | |
| CN202494744U (en) | Device for detecting quality of electric energy | |
| CN208672718U (en) | Power quality analysis device based on short-distance wireless communication technology | |
| CN204065289U (en) | For the checkout equipment of arc light protecting device | |
| CN206235684U (en) | A kind of charger automatic test instrument | |
| CN203117280U (en) | STM 32-based intelligent four-probe meter | |
| CN202770912U (en) | Diverter tester | |
| CN111474512B (en) | Acceptance detection method and device for newly-installed metering equipment and readable storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20150131 |
|
| EXPY | Termination of patent right or utility model |