CN202025038U - Serial connection type zero load current phase measuring instrument - Google Patents
Serial connection type zero load current phase measuring instrument Download PDFInfo
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- CN202025038U CN202025038U CN2010205992161U CN201020599216U CN202025038U CN 202025038 U CN202025038 U CN 202025038U CN 2010205992161 U CN2010205992161 U CN 2010205992161U CN 201020599216 U CN201020599216 U CN 201020599216U CN 202025038 U CN202025038 U CN 202025038U
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Abstract
The utility model relates to a serial connection type zero load current phase measuring instrument, which consists of a sampling part, a display part, a central processing unit, a keyboard part, a current amplification part and an instrument case, wherein the sampling part comprises a voltage grading resistor and a current transformator, the voltage is sampled through the voltage grading resistor, the current sampling is completed through the high-precision clamp-shaped current transformator, the display part consists of 128*60 lattice liquid crystals and can display parameters and patterns, the central processing unit adopts an MSP430 high-performance singlechip as a central control element, the sampling calculation and the analysis function can be simultaneously completed, the measuring instrument adopts three keys, the operation corresponds to the liquid crystal display, the effects of each press key can be prompted through the liquid crystals, the operation is simple, the current can be amplified by 10 times through the current amplification unit so that an instrument for detecting smaller current (20mA) can adopt the clamp-shaped current transformator for measuring the current phase, direct wiring can also be adopted for measuring the phase of small current, the measurement is accurate and convenient, and the instrument case is mainly used for assembling the elements. A current clamp meter interface, a voltage input (negative), a voltage input (positive), a conversion switch, a current transformator, an amplifier current input, an amplifier current output, a switch and a charging opening are arranged on the surface of the instrument case. The serial connection type zero load current phase measuring instrument has the advantages that the use is convenient, the precision is high, and the artificial error is few.
Description
Technical field
The utility model relates to amplitude and the device of phase place, especially the concatenation type zero load current phase measuring instrument of measuring protective relaying device secondary capacitance current, belongs to power equipment detection technique field.
Background technology
Protective relaying device is the important assurance of the normal operation of electric system in electric system, and the secondary connection of protective relaying device is more loaded down with trivial details, occurs various mistakes easily.Correctness for the site inspection wiring is an important and loaded down with trivial details job.The instrument of traditional measurement secondary current phase place adopts the jaw type mensuration, promptly block amplitude and the phase place that the secondary current heart yearn is measured electric current with pincerlike clip, at transmission line of electricity not during on-load, owing to only pass through the small number of lines capacitive earth current on the circuit, current value is very little, being reacted to secondary side has only about 10mA, the clamp on amperemeter measuring accuracy descends, the correctly amplitude of kinetic current and phase place, cause measuring failure, have only on the circuit band of grade behind the load ability correct measurement, and load increasing need be waited for for a long time, has a strong impact on efficiency of measurement.In addition, traditional clamp on amperemeter need snap in clamp the electric current heart yearn when measuring, if during the heart yearn dense arrangement, the adjacent current heart yearn might be extruded terminal row when pincers are gone into clamp and cause current open, forms high pressure and jeopardizes the person and device security.
Summary of the invention
The utility model overcomes above technical deficiency, and a kind of employing concatenation type current measuring method is provided, and the nonloaded line capacitive earth current is amplified the concatenation type zero load current phase measuring instrument that reaches accurate measurement by handtailor coil.The utility model can reduce the time of waiting for load growth when measuring current amplitude and phase place, causes the possibility of current return open circuit when clamp snaps in heart yearn when having avoided pincerlike PH phasemeter to measure.
The technical solution of the utility model is: concatenation type zero load current phase measuring instrument, form by sampling section, display part, CPU (central processing unit), keyboard portion, electric current amplifier section, tool housing.Sampling section comprises the divider resistance summation current transformer, and voltage is sampled by divider resistance, and current sample is finished by the high precision split core type current transformer; The display part is made of 128 * 64 lattice lcds, can show parameter and figure; CPU (central processing unit) adopts control elements in the conduct of MSP430 high-performance single-chip microcomputer, can finish sampling simultaneously and calculating and analytic function; Tester adopts three keys, operates correspondingly with liquid crystal display, and liquid crystal can be pointed out the effect of each button, and is simple to operate; Current amplification unit can amplify electric current 10 times, can adopt split core type current transformer measurement current phase also can adopt direct wiring to measure the phase place of little electric current so that detect littler electric current (20mA) instrument, and it is accurately convenient to measure; Tool housing is mainly used to assemble above element.
Described tool housing surface be provided with the input of electric current split-core type meter interface, voltage-, the voltage input+, switch, power pack, amplifier current input, amplifier current output, switch, charge port.
During measurement, by amplifier current input and amplifier current output electric current is adopted into device, be enlarged into 10 times capacitance current by power pack, import-import+voltage is adopted into device by voltage with voltage, cpu changes by A/D, electric current and voltage is converted to digital signal, through calculating parameters such as the effective value of electric current and voltage and phase place.The phase relation of each parameter that cpu will record is depicted as vector plot and is presented on the liquid crystal.Can measure three voltages and three magnitudes of current or six magnitudes of current simultaneously.Full Chinese shows very directly perceived, provides very big convenience to the user.
When load current during greater than 1A, electric current needn't amplify in the time of just can measuring, and can switch to the measuring method of pincerlike meter by the switch on the device, and is simple to operation in the use.
Directly measurement need be advanced the instrument string current return of surveying.Should notice during operation that whether wiring is firmly correct, can not make the current return open circuit.The direct method of measurement can make electric current amplify 10 times, and more the high measurement electric current is littler for measuring accuracy, (can survey the above electric current of 10mA).
Technical indicator of the present utility model:
1. be applicable to that the power transformation primary equipment puts into operation the back circuit not during on-load, utilize the amplitude and the phase place of nonloaded line capacitance current measurement protective relaying device secondary capacitance current over the ground, checking the correctness of secondary circuit wiring,
2. environment for use condition
Operating ambient temperature :-20 ℃～+ 50 ℃;
Storage condition temperature :-25 ℃～+ 70 ℃;
Humidity: maximal humidity 90%, the no condensation in surface;
Degree of protection: IEC529-P53;
Height above sea level:＜4000M;
3. interference free performance
The harsh grade that device can bear the GB/T14598.14 regulation is the static discharge experiment of III level;
The harsh grade that device can bear the GB/T14598.9 regulation is the radiation field interference experiment of III level;
The harsh grade that device can bear the GB/T14598.10 regulation is the fast transient interference experiment of III level;
The frequency that device can bear the GB/T14598.13 regulation is that the pulse train interference experiment is dialled in 1MHz and 100KHz decay concussion.
4. insulating property
The dielectric voltage withstand standard satisfies the GB/T14598.3 regulation.
5. mechanical property
Condition of work: by the I level vibration responding check of GB/T11287 regulation, and GB/T14537
The beneficial effects of the utility model:
1, can realize inspection, increase work efficiency and, reduce human error the line accuracy to protective relaying device secondary connection or measuring apparatus wiring.
2, adopt the high-performance single-chip microcomputer as measuring computing unit, powerful, full Chinese shows easy to use.
3, adopt the clamp on amperemeter outward appearance easy to carry.
4, electric current can show the phase relation of a plurality of voltage and currents simultaneously with split-core type meter card line also directly wiring, can measure the 10mA electric current.
5, has how on-the-spot utility function.
Description of drawings
Accompanying drawing 1 is the utility model principle of work schematic block diagram;
Among the figure: 1. electric current split-core type meter interface, 2. voltage input-, 3. voltage input+, 4. switch, 5. power pack, 6. amplifier current input, 7. amplifier current output, 8. switch, 9. charge port.
Embodiment
The utility model is described in further detail in conjunction with the accompanying drawings, and concatenation type zero load current phase measuring instrument is made up of sampling section, display part, CPU (central processing unit), keyboard portion, electric current amplifier section, tool housing.Sampling section comprises the divider resistance summation current transformer, and voltage is sampled by divider resistance, and current sample is finished by the high precision split core type current transformer; The display part is made of 128 * 64 lattice lcds, can show parameter and figure; CPU (central processing unit) adopts control elements in the conduct of MSP430 high-performance single-chip microcomputer, can finish sampling simultaneously and calculating and analytic function; Tester adopts three keys, operates correspondingly with liquid crystal display, and liquid crystal can be pointed out the effect of each button, and is simple to operate; Current amplification unit can amplify electric current 10 times, can adopt split core type current transformer measurement current phase also can adopt direct wiring to measure the phase place of little electric current so that detect littler electric current (20mA) instrument, and it is accurately convenient to measure; Tool housing is mainly used to assemble above element.The tool housing surface is provided with electric current split-core type meter interface 1, voltage input-2, voltage input+3, switch 4, power pack 5, amplifier current input 6, amplifier current output 7, switch 8, charge port 9.
During measurement, instrument is adopted electric current into device by amplifier current input 6 and amplifier current output 7, be enlarged into 10 times capacitance current by power pack 5, by voltage input-2 and voltage input+3 voltage is adopted into device, cpu changes by A/D, electric current and voltage is converted to digital signal, through calculating parameters such as the effective value of electric current and voltage and phase place.The phase relation of each parameter that cpu will record is depicted as vector plot and is presented on the liquid crystal.Can measure three voltages and three magnitudes of current or six magnitudes of current simultaneously.Full Chinese shows very directly perceived, provides very big convenience to the user.When load current during greater than 1A, electric current needn't amplify in the time of just can measuring, and can switch to the measuring method of pincerlike meter by the switch on the device, and is simple to operation in the use.
Claims (2)
1. concatenation type zero load current phase measuring instrument, form by sampling section, display part, CPU (central processing unit), keyboard portion, electric current amplifier section, tool housing, it is characterized in that, sampling section comprises the divider resistance summation current transformer, voltage is sampled by divider resistance, and current sample is finished by the high precision split core type current transformer; The display part is made of 128 * 64 lattice lcds; CPU (central processing unit) adopts control elements in the conduct of MSP430 high-performance single-chip microcomputer, can finish sampling simultaneously and calculating and analytic function; Keyboard portion adopts three keys, operates corresponding with liquid crystal display; Current amplification unit adopts split core type current transformer measurement current phase or measures the phase place of little electric current with direct wiring; Tool housing is mainly used to assemble above element.
2. concatenation type zero load current phase measuring instrument according to claim 1, it is characterized in that the appearance of tool housing is provided with electric current split-core type meter interface (1), voltage input-(2), voltage input+(3), switch (4), power pack (5), amplifier current input (6), amplifier current output (7), switch (8), charge port (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205992161U CN202025038U (en) | 2010-11-10 | 2010-11-10 | Serial connection type zero load current phase measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205992161U CN202025038U (en) | 2010-11-10 | 2010-11-10 | Serial connection type zero load current phase measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202025038U true CN202025038U (en) | 2011-11-02 |
Family
ID=44849983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205992161U Expired - Fee Related CN202025038U (en) | 2010-11-10 | 2010-11-10 | Serial connection type zero load current phase measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202025038U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021889A (en) * | 2014-04-29 | 2015-11-04 | 国网山西省电力公司电力科学研究院 | Current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring small load |
| CN117572287A (en) * | 2023-12-27 | 2024-02-20 | 长春三鼎变压器有限公司 | Low-voltage high-current measuring equipment and method for electric furnace transformer |
-
2010
- 2010-11-10 CN CN2010205992161U patent/CN202025038U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105021889A (en) * | 2014-04-29 | 2015-11-04 | 国网山西省电力公司电力科学研究院 | Current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring small load |
| CN105021889B (en) * | 2014-04-29 | 2017-07-18 | 国网山西省电力公司电力科学研究院 | A kind of electric current conversion voltage series-connected type can survey Smaller load without pincers volt-ampere phase meter |
| CN117572287A (en) * | 2023-12-27 | 2024-02-20 | 长春三鼎变压器有限公司 | Low-voltage high-current measuring equipment and method for electric furnace transformer |
| CN117572287B (en) * | 2023-12-27 | 2024-06-07 | 长春三鼎变压器有限公司 | Low-voltage high-current measuring equipment and method for electric furnace transformer |
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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: 20111102 Termination date: 20111110 |