CN203825082U - Current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring small load - Google Patents
Current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring small load Download PDFInfo
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- CN203825082U CN203825082U CN201420214924.7U CN201420214924U CN203825082U CN 203825082 U CN203825082 U CN 203825082U CN 201420214924 U CN201420214924 U CN 201420214924U CN 203825082 U CN203825082 U CN 203825082U
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Abstract
The utility model relates to a current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring a small load, which is connected to a current transformer terminal in series by using precision resistors, converts small current signals into voltage signals, not only can measure the protection phasor of high-voltage electric power equipment under a small load and overcome a congenital defect of inability of measuring small current of a clamp type volt-ampere phase meter, but also removes a clamp of the clamp type volt-ampere phase meter and enables the measurement process to be more convenient and safer. The current-to-voltage conversion tandem type clamp-free volt-ampere phase meter provided by the utility model solves a problem that a large quantity of loads required to be recognized to carry out phasor measurement on the high-voltage electric power equipment being electrified for the first time, and the accuracy of the protection phasor can be checked under a load condition of being far lower than 10% of a conventionally required load, thereby being capable of putting the equipment into operation as soon as possible. The current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring a small load not only can avoid the equipment from being damaged, but also can save a lot of electric energy, thereby ensuring safe operation of a power grid. The current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring a small load can be widely applied to the field of phasor measurement.
Description
Technical field
The utility model relate to a kind of current conversion voltage series-connected type can survey little load without pincers volt-ampere phase meter, particularly a kind of current conversion voltage series-connected type can survey little load without pincers volt-ampere phase meter.
Background technology
In the time that newly-built load transformer or circuit drop into first, such as large power plant for subsequent use/start and become or when newly-built factories and miness transformer is charged first, need to after high voltage electric power equip ment charging, bring immediately large load to check differential protection phasor.After protection and table meter phasor are correct, could drop into primary equipment and main protection thereof.The utensil of measuring at present phasor is pincers type volt-ampere phase meter.It measures electric current is to rely on the pliers of induction field to complete, working as in theory surveyed minimum current value is 5 milliamperes, in fact due to the interference in on-the-spot other loops, common surveyed current value is greater than 10 MAHs, and pincers type volt-ampere phase meter could Measurement accuracy current value and phase place thereof.
Ensure pincers type volt-ampere phase meter Measurement accuracy phasor for ensuring enough electric currents; " 18 great anti-accident measures of electrical network " 15.5.6 article specifies specially: all differential protections (circuit, bus, transformer, reactor, generator etc.) are before putting into operation; except measuring He Cha loop, phase loop under load current is greater than 10% condition of current transformer rated current; also must measure out-of-balance current, the voltage of each neutral line, to ensure the correctness of protective device and secondary circuit wiring.
But after these newly-built high voltage electric power equip ments are charged first, bring immediately large duty ratio more difficult, now a large amount of electric driven equipments (load) are being installed or are being installed because not having power supply not carry out debugging conventionally.If at this moment organize a large amount of electric driven equipments rotating operation in the time not debugging, not only easily cause device damage accident, also, because idle running consumes a large amount of electric energy, also may cause power equipment accident impact power system security.Develop the volt-ampere phase meter that can measure phasor under little load and become the key that cracks an above-mentioned difficult problem.
Utility model content
(1) technical matters that will solve
The technical problems to be solved in the utility model is exactly how a kind of volt-ampere phase meter that can measure phasor under little load is provided.
(2) technical scheme
In order to solve the problems of the technologies described above, the utility model provide a kind of current conversion voltage series-connected type can survey little load without pincers volt-ampere phase meter, it is characterized in that, comprise current terminal, voltage terminal, resistance, divider resistance, PLC, display screen, battery, modulus conversion chip, conversion handle;
Wherein resistance, divider resistance, PLC, display screen, modulus conversion chip are integrated on a circuit board;
Current terminal has Same Name of Ends and two terminals of non-same polarity; Two terminal inner sides are connected with the two ends of resistance respectively, and terminal arranged outside is current terminal standard jacks; In current terminal standard jacks, be inserted with the plug of two p-wires, the opposite side plug of two p-wires is inserted into the current terminal jack on current return; Same Name of Ends terminal is corresponding to be connected with the positive polarity current terminal on current return, and non-same polarity terminal is corresponding to be connected with the negative polarity current terminal on current return;
Analog input loop more than modulus conversion chip You San road; Resistance two ends are also connected with the first via analog input of modulus conversion chip, and the output of modulus conversion chip is connected with the input of PLC, and modulus conversion chip is that digital quantity is given PLC analog quantity sample conversion;
Voltage terminal has Same Name of Ends and two terminals of non-same polarity; Terminal inner side is connected with the two ends of divider resistance respectively, and terminal arranged outside is voltage terminal standard jacks; In voltage terminal standard jacks, be inserted with two test pencil lines, Same Name of Ends connects the positive ends that test pencil line other end connects the voltage of surveying, and non-same polarity connects the negative polarity end that test pencil line other end connects the voltage of surveying;
The Third Road analog input of the output terminal of divider resistance and modulus conversion chip is connected; Divider resistance is a high internal resistance voltage divider, and the voltage signal that voltage terminal is sent here is reduced into 0.01 times;
The gear output of conversion handle is connected with the input of PLC, gives PLC the gear signal of measuring;
Battery provides power supply to PLC, display screen and modulus conversion chip;
The output of PLC is connected with the input of display screen, and PLC is according to modulus conversion chip and change the corresponding amplitude of calculated signals and the phase place that handle is sent here, and shows on display screen.
Preferably, described current terminal comprises first via current terminal, the second road current terminal; Described resistance comprise first via resistance, the second road resistance.
Preferably, described conversion handle has first via current amplitude, the second road current amplitude, voltage magnitude, first via electric current and the second tunnel current phase, voltage and first via current phase, voltage and the second tunnel current phase totally six measurement gears.
Preferably, the resistance value of described first via resistance be 1 ohm above below 8 ohm, precision be-0.01% to+0.01%, temperature coefficient is the precision resistance of 5ppm/ DEG C, stores and is solidificated in PLC; The resistance value that the second road resistance is be 1 ohm above below 8 ohm, precision be-0.01% to+0.01%, temperature coefficient is the precision resistance of 5ppm/ DEG C, stores and is solidificated in PLC.
(3) beneficial effect
A kind of current conversion voltage series-connected type of the present utility model can survey little load without pincers volt-ampere phase meter; utilize precision resistance to be connected on current transformer terminal; little current signal is changed into voltage signal; not only can under little load, measure high voltage electric power equip ment protection phasor; overcome pincers type volt-ampere phase meter and can not measure the birth defect of little electric current; also remove the table pincers of pincers type volt-ampere phase meter, made that measuring process is more convenient, safety.Solve a high voltage electric power equip ment charged difficult problem that needs a large amount of loads of tissue carry out phasor measurement first, can be under the load condition below 10% that requires load much smaller than routine the correctness of check protection phasor, can early equipment investment be moved.Not only can avoid device damage, also can save a large amount of electric energy, to ensure electric power netting safe running.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1: a kind of current conversion voltage series-connected type that the utility model provides can survey little load without pincers volt-ampere phase meter;
In figure: 1, first via current terminal; 2, the second road current terminal; 3, voltage terminal; 4, first via resistance; 5, the second road resistance; 6, divider resistance; 7, PLC; 8, display screen; 9, battery; 10, modulus conversion chip; 11, conversion handle.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for illustrating the utility model, but can not be used for limiting scope of the present utility model.
As shown in Figure 1, a kind of current conversion voltage series-connected type of the present embodiment can survey little load without pincers volt-ampere phase meter, comprise first via current terminal 1, the second road current terminal 2, voltage terminal 3, first via resistance 4,, the second road resistance 5, divider resistance 6, PLC7, display screen 8, battery 9, modulus conversion chip 10, conversion handle 11.First via resistance 4, the second road resistance 5, divider resistance 6, PLC7, display screen 8, modulus conversion chip 10 are integrated on a circuit board.
First via current terminal 1 has Same Name of Ends and two terminals of non-same polarity.Terminal inner side is connected with the two ends of first via resistance 4 respectively, and terminal arranged outside is current terminal standard jacks.While measuring phasor, the jack of two terminals is plugged respectively the plug of two test wires, and the opposite side plug of two test wires is inserted into the current terminal jack on current return.Same Name of Ends terminal is corresponding to be connected with the positive polarity current terminal on current return, and non-same polarity terminal is corresponding to be connected with the negative polarity current terminal on current return.When measurement, first the plug of test wire is inserted into the jack at current transformer terminal two ends, then turn-off current mutual inductor terminal is middle in flakes.Measurement finishes rear first connection in the middle of current transformer terminal in flakes, then the plug of pull line.When measurement, first via resistance 4 is connected on secondary loop of mutual inductor, makes current signal change voltage signal into.
The second road current terminal 2 has Same Name of Ends and two terminals of non-same polarity.The two ends of terminal inner side respectively with the second road resistance 5 are connected, and terminal arranged outside is current terminal standard jacks.While measuring phasor, the jack of two terminals is plugged respectively the plug of two test wires, and the opposite side plug of two test wires is inserted into the current terminal jack on current return.Same Name of Ends terminal is corresponding to be connected with the positive polarity current terminal on current return, and non-same polarity terminal is corresponding to be connected with the negative polarity current terminal on current return.When measurement, first the plug of test wire is inserted into the jack at current transformer terminal two ends, then turn-off current mutual inductor terminal is middle in flakes.Measurement finishes rear first connection in the middle of current transformer terminal in flakes, then the plug of pull line.When measurement, the second road resistance 5 is connected on secondary loop of mutual inductor, makes current signal change voltage signal into.
First via current terminal 1 and the second road current terminal 2 need to use separately according to measuring, and also can use simultaneously.
Voltage terminal 3 has Same Name of Ends and two terminals of non-same polarity.Terminal inner side is connected with the two ends of divider resistance 6 respectively, and terminal arranged outside is voltage terminal standard jacks.While measuring phasor, the jack of two terminals is plugged respectively two test pencil lines, and Same Name of Ends connects the positive ends that test pencil line other end connects the voltage of surveying, and non-same polarity connects the negative polarity end that test pencil line other end connects the voltage of surveying.
First via resistance 4 is precision resistances, and the current signal that first via current terminal 1 is sent here is converted into voltage signal; The second road resistance 5 is precision resistances, and the current signal that the second road current terminal 1 is sent here is converted into voltage signal; Divider resistance 6 is high internal resistance voltage dividers, and the voltage signal that voltage terminal 3 is sent here is converted into weak voltage signal.
The analog input loop of modulus conversion chip 10 connect respectively first via resistance 4,, the output of the second road resistance 5, divider resistance 6, modulus conversion chip 10 is digital quantity analog quantity sample conversion; And give PLC7.
Conversion handle 11 have between first via current amplitude, the second road current amplitude, voltage magnitude, first via electric current and the second road electric current between phase place, voltage and first via electric current between phase place, voltage and the second road electric current phase place totally six measure gears.Measure gear signal and give PLC7.
Battery 9 provides power supply to PLC7, display screen 8 and modulus conversion chip 10.
PLC7 is according to modulus conversion chip 10 and change the corresponding amplitude of calculated signals and the phase place that handle 11 is sent here, and shows on display screen 8.
Current conversion voltage series-connected type can be surveyed the as follows without pincers volt-ampere phase meter measurement first via current amplitude process of little load: conversion handle 11 is pulled first via current amplitude gear, first via current terminal 1 connects surveyed current terminal by p-wire, turn-off current terminal is middle in flakes, first via resistance 4 is connected in the middle of first via current terminal 1, electric current flows through first via resistance 4 and produce voltage on first via resistance 4, modulus conversion chip 10 is changed this voltage and is given PLC7 into digital signal, PLC7 utilizes voltage and the R1 value being solidificated on PLC7 to calculate current value, current value shows on display screen 8.In the middle of restoring current terminal, in flakes, extract p-wire, first via current amplitude is measured and is finished.
Current conversion voltage series-connected type can survey little load without pincers volt-ampere phase meter, to measure the second road current amplitude process as follows: conversion handle 11 is pulled the second road current amplitude gear, the second road current terminal 2 connects surveyed current terminal by p-wire, turn-off current terminal is middle in flakes, the second road resistance 5 is connected in the middle of the second road current terminal 2, electric current flows through the second road resistance 5 and produce voltage on the second road resistance 5, modulus conversion chip 10 is changed this voltage and is given PLC7 into digital signal, PLC7 utilizes voltage and the R2 value being solidificated on PLC7 to calculate current value, current value shows on display screen 8.In the middle of restoring current terminal, in flakes, extract p-wire, the second road current amplitude is measured and is finished.
Current conversion voltage series-connected type can be surveyed the as follows without pincers volt-ampere phase meter measuring voltage value process of little load: conversion handle 11 is pulled magnitude of voltage gear, voltage terminal 3 connects by test pencil line the voltage terminal of surveying, modulus conversion chip 10 is changed this voltage and is given PLC7 into digital signal, PLC7 utilizes this magnitude of voltage and is solidificated in the dividing potential drop no-load voltage ratio of the divider resistance 6 on PLC7, conversion actual voltage value shows on display screen 8.In the middle of restoring current terminal, in flakes, extract test pencil line, magnitude of voltage is measured and is finished.
Current conversion voltage series-connected type can be surveyed the as follows without pincers volt-ampere phase meter measurement first via electric current and the second tunnel current phase process of little load: conversion handle 11 is pulled first via electric current and the second tunnel current phase gear, first via current terminal 1, the second road current terminal 2 connects surveyed two-way current terminal successively by p-wire, turn-off current terminal is middle in flakes, first via resistance 4 is connected in the middle of first via current terminal 1, the second road resistance 5 is connected in the middle of the second road current terminal 2, one road electric current flows through first via resistance 4 and produce voltage on first via resistance 4, another road electric current flows through the second road resistance 5 and produce voltage on the second road resistance 5, modulus conversion chip 10 is changed these two voltages and is given PLC7 into digital signal, PLC7 utilizes voltmeter to calculate phase place, phase value shows on display screen 8.In the middle of restoring current terminal, in flakes, extract p-wire, first via electric current and the second tunnel current phase are measured and are finished.
Current conversion voltage series-connected type can be surveyed the as follows without pincers volt-ampere phase meter measuring voltage and first via current phase process of little load: conversion handle 11 is pulled voltage and first via current phase gear, voltage terminal 3, first via current terminal 1 connect surveyed voltage, current terminal, turn-off current terminal is middle in flakes, modulus conversion chip 10 is changed these two voltages and is given PLC7 into digital signal, PLC7 utilizes voltmeter to calculate phase place, and phase value shows on display screen 8.In the middle of restoring current terminal, in flakes, extract connecting line, voltage and first via current phase are measured and are finished.
Current conversion voltage series-connected type can be surveyed the as follows without pincers volt-ampere phase meter measuring voltage and the second tunnel current phase process of little load: conversion handle 11 is pulled voltage and the second tunnel current phase gear, voltage terminal 3, first via current terminal 1 connect surveyed voltage, current terminal, turn-off current terminal is middle in flakes, modulus conversion chip 10 is changed these two voltages and is given PLC7 into digital signal, PLC7 utilizes voltmeter to calculate phase place, and phase value shows on display screen 8.In the middle of restoring current terminal, in flakes, extract connecting line, voltage and the second tunnel current phase are measured and are finished.
Above embodiment is only for the utility model is described, but not to restriction of the present utility model.Although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is carried out to various combinations, revises or is equal to replacement, do not depart from the spirit and scope of technical solutions of the utility model, all should be encompassed in the middle of claim scope of the present utility model.
Claims (4)
- A current conversion voltage series-connected type can survey little load without pincers volt-ampere phase meter, it is characterized in that, comprise current terminal, voltage terminal (3), resistance, divider resistance (6), PLC (7), display screen (8), battery (9), modulus conversion chip (10), conversion handle (11);Wherein resistance, divider resistance (6), PLC (7), display screen (8), modulus conversion chip (10) are integrated on a circuit board;Current terminal has Same Name of Ends and two terminals of non-same polarity; Two terminal inner sides are connected with the two ends of resistance respectively, and terminal arranged outside is current terminal standard jacks; In current terminal standard jacks, be inserted with the plug of two p-wires, the opposite side plug of two p-wires is inserted into the current terminal jack on current return; Same Name of Ends terminal is corresponding to be connected with the positive polarity current terminal on current return, and non-same polarity terminal is corresponding to be connected with the negative polarity current terminal on current return;Analog input loop more than modulus conversion chip (10) You San road; Resistance two ends are also connected with the first via analog input of modulus conversion chip, the output of modulus conversion chip (10) is connected with the input of PLC (7), and modulus conversion chip (10) is that digital quantity is given PLC (7) analog quantity sample conversion;Voltage terminal (3) has Same Name of Ends and two terminals of non-same polarity; Terminal inner side is connected with the two ends of divider resistance respectively, and terminal arranged outside is voltage terminal standard jacks; In voltage terminal standard jacks, be inserted with two test pencil lines, Same Name of Ends connects the positive ends that test pencil line other end connects the voltage of surveying, and non-same polarity connects the negative polarity end that test pencil line other end connects the voltage of surveying;The output terminal of divider resistance (6) is connected with the Third Road analog input of modulus conversion chip (10); Divider resistance (6) is a high internal resistance voltage divider, and the voltage signal that voltage terminal (3) is sent here is reduced into 0.01 times;The gear output of conversion handle (11) is connected with the input of PLC (7), gives PLC (7) the gear signal of measuring;Battery (9) provides power supply to PLC (7), display screen (8) and modulus conversion chip (10);The output of PLC (7) is connected with the input of display screen (8), PLC (7) is according to modulus conversion chip (10) and change the corresponding amplitude of calculated signals and the phase place that handle (11) is sent here, and shows on display screen (8).
- Current conversion voltage series-connected type according to claim 1 can survey little load without pincers volt-ampere phase meter, it is characterized in that, described current terminal comprises first via current terminal (1), the second road current terminal (2); Described resistance comprises first via resistance (4), the second road resistance (5).
- Current conversion voltage series-connected type according to claim 1 can survey little load without pincers volt-ampere phase meter, it is characterized in that, described conversion handle (11) has first via current amplitude, the second road current amplitude, voltage magnitude, first via electric current and the second tunnel current phase, voltage and first via current phase, voltage and the second tunnel current phase totally six measurement gears.
- Current conversion voltage series-connected type according to claim 2 can survey little load without pincers volt-ampere phase meter, it is characterized in that, the resistance value of described first via resistance (4) be 1 ohm above below 8 ohm, precision is-0.01% to+0.01%, temperature coefficient is the precision resistance of 5ppm/ DEG C, and storage is solidificated in PLC (7); The second road resistance be the resistance value of (5) be 1 ohm above below 8 ohm, precision be-0.01% to+0.01%, temperature coefficient is the precision resistance of 5ppm/ DEG C, stores and is solidificated in PLC (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420214924.7U CN203825082U (en) | 2014-04-29 | 2014-04-29 | Current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring small load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420214924.7U CN203825082U (en) | 2014-04-29 | 2014-04-29 | Current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring small load |
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| Publication Number | Publication Date |
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| CN203825082U true CN203825082U (en) | 2014-09-10 |
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| CN201420214924.7U Expired - Fee Related CN203825082U (en) | 2014-04-29 | 2014-04-29 | Current-to-voltage conversion tandem type clamp-free volt-ampere phase meter capable of measuring small load |
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Cited By (1)
| 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 |
-
2014
- 2014-04-29 CN CN201420214924.7U patent/CN203825082U/en not_active Expired - Fee Related
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 |
| 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 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140910 Termination date: 20190429 |
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| CF01 | Termination of patent right due to non-payment of annual fee |