CN104316892A - Transformer load box calibration device - Google Patents
Transformer load box calibration device Download PDFInfo
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- CN104316892A CN104316892A CN201410548397.8A CN201410548397A CN104316892A CN 104316892 A CN104316892 A CN 104316892A CN 201410548397 A CN201410548397 A CN 201410548397A CN 104316892 A CN104316892 A CN 104316892A
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Abstract
The invention provides a transformer load box calibration device. The transformer load box calibration device comprises an input power supply, a power amplifier unit, a gear switching unit, a sampling unit and a main system module; the input power supply is connected with the power amplifier unit; an input end of the power amplifier unit is connected with the main system module; an output end of the power amplifier unit is connected with an input end of the gear switching unit; an output end of the gear switching unit is connected with an input end of the sampling unit; an output end of the sampling unit is connected with an input end of the main system module. The transformer load box calibration device is designed in an integrated mode, the operation is convenient, the size is small, and the use requirements of the industrial field are met.
Description
Technical field
The present invention relates to electric instrument equipment technical field, particularly, relate to a kind of mutual inductor load box calibration equipment.
Background technology
Mutual inductor load box is when calibration current or voltage transformer (VT), for being provided the gauging instrument of a kind of Multi-value of simulation load by school mutual inductor.The fast development of national economy makes the demand of electric power increasing, and stability, the reliability of the work of electrical measurement mutual inductor are most important in electrical measurement process control.As mutual inductor load box calibration equipment, the checkout equipment of traditional mutual inductor load box is bulky, and link is complicated, and inconvenient operation, can not meet the request for utilization of industry spot.
Along with a large amount of uses of mutual inductor load box, the verifying work of mutual inductor load box also increasingly sharpens, classic method adopts high-power program control source output voltage current signal, adopt the electric current in High-precision standard table testing load case both end voltage, loop and the phase place between voltage and electric current, when the load of electric current and voltage Burden box is very little, the voltage measured or electric current will be very little, and standard scale general like this can not meet measuring accuracy.And when measuring with external standard scale, also error will be brought to electric current and voltage, and more cannot realize real-time recorded data and calculate error, and operation is very loaded down with trivial details, realize a large amount of calibratings, time-consuming, effort.
Publication number is the Chinese invention patent application of CN 102313878A, which disclose a kind of high-accuracy calibrating device for mutual inductor load box, this device adopts Maxwell bridge principle, regulate the resistance capacitance value of electric capacity brachium pontis in electric bridge, the resistance value of tested Burden box can be calculated easily, its accuracy is only relevant with the accuracy of Resistor-Capacitor Unit and the intrinsic element of circuit, and test result is not by the quality influence such as supply frequency or harmonic wave.This technology due to adopt capacitance-resistance original paper affect by environment, material, long-term stability is bad, and reliability is not high.
Publication number is the Chinese utility model patent of CN 202330557U, which disclose a kind of automatic calibration device of mutual inductor load box, comprise system controller, tester, testing source, switch method of remote signal device, LCD display and hummer, only need to send out order auto levelizer first, whole calibration process just can complete automatically, and operation is succinct, test is quick; Fourier transform method model can be adopted to carry out computing, can effectively harmonic filtration, measure fundametal compoment, without the need to hardware filtering, thus avoid the peak deviation and phase deviation that hardware filtering causes.Although this technology can realize automatic calibration, do not provide the concrete technology such as controller and realize introducing, and the volume of device is relatively large.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of mutual inductor load box calibration equipment, described device is the integrated design, easy to operate, and volume is little, meets request for utilization.
For realizing above-mentioned object, the present invention by the following technical solutions:
A kind of mutual inductor load box calibration equipment, comprise: input power, power amplifier unit, gear switch unit, sampling unit, main system module, wherein: described input power connects described power amplifier unit, the input end main system module of described power amplifier unit, described power amplifier unit output terminal connects the input end of described gear switch unit, the output terminal of described gear switch unit connects the input end of described sampling unit, and the output terminal of described sample circuit connects the input end of described main system module; The power source of described power amplifier unit to input amplifies, and the signal after amplifying is passed to described gear switch unit, described gear switch unit is according to power input source size, and automatically select voltage or electric current gear, the value making measuring-signal be transferred to sampling unit remains in input range; Described sampling unit is sampled to the voltage of input or current signal, converts digital signal to and be transferred to described main system module through A/D; Described main system module processes in real time to the data gathered, and is shown by display unit; Described main system module carries out controlling of sampling by described power amplifier unit simultaneously.
Described input power adopts high power switching power supply, and this high power switching power supply is combined with voltage or the accurate sampling unit of electric current.High-power power source is adopted to be combined with volume limit for height accuracy standard table, high-power for voltage source and electric current high precision table are combined or be combined with voltage high accuracy table in high-power for electric current source, voltage or electric current verification employing one road power amplifier unit time-sharing multiplex, this avoid the mutual interference between electric current and voltage, and reduce merging, calibration equipment volume also can do little, light, is easy to carry about with one.
Preferably, described sampling unit adopts accurate voltage or current sampling circuit, further, described accurate voltage or current sampling circuit can adopt successive approximation analog to digital conversion circuit, are provided with one 16 without losing code sampling analog to digital converter, internal conversion clock, a multi-functional serial interface port and a sampling hold circuit in this analog to digital conversion circuit.
Preferably, described main system module adopts the design of ARM and DSP double-core, described DSP and analog to digital conversion circuit are responsible for AC portion and are sampled, calculate, and described ARM be responsible for direct current sampling and calculate and to voltage or current sample, calculating, calibration, storage calibration data and gear switch, finally direct current measurement instantaneous value is passed through SPI communication modes and DSP communication, thus make between alternating current-direct current, to adopt circuit strictly independently to separate, ensure reliability and the accuracy requirement of equipment.The collection of DSP primary responsibility voltage or current signal and FFT calculate, and voltage or electric current gear calculate and switch and man-machine interface and Keyboard Control, so both can alleviate the burden that DSP calculates, and can by table source separately, make between table source unaffected mutually again.
Preferably, described gear switch unit is provided with analog multichannel switch, large small voltage independently separates by this switch and chip 74HC595 pilot relay to be measured, change sample-and-hold circuit enlargement factor, according to input voltage size, the gear that automatic selection is suitable, the value making measuring-signal be transferred to analog to digital converter remains in input range.
Preferably, described main system module is provided with man-machine interface, and interface adopts Chinese character display, makes the interpersonal interface of equipment more convenient more humane, and completes real-time control task by real time operating system, can manual operation observe outside real time data; Described main system module can also be connected to the planning standard instrument check system software on PC further, just can data be passed in real time uses on host computer, if mix the communications protocol of tested equipment in check system software, just can draw in real time by the error of checking device, according to different tested equipment, mix calibrating scheme, just can realize full-automatic verification.
Compared with prior art, the present invention has following beneficial effect:
The present invention is mainly for the vacancy verified in domestic and international mutual inductor load box, the integrated design of research mutual inductor load box calibration equipment emphatically, high-power power source is adopted to be combined with volume limit for height accuracy standard table, high-power for voltage source and electric current high precision table are combined or be combined with voltage high accuracy table in high-power for electric current source, adopt a road power amplifier time-sharing multiplex simultaneously, this avoid the mutual interference between electric current and voltage, and reduce merging, and calibration equipment volume also can do little, light, be easy to carry about with one.The present invention adopts Chinese character to show and real time operating system, makes the man-machine interface of equipment more convenient more humane.The present invention be connected with PC, can realize the full-automatic verification of various criterion equipment, the time cycle shortens, and makes verification accurately higher.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is one embodiment of the invention general structure block diagram;
Fig. 2 is one embodiment of the invention overall circuit schematic diagram;
Fig. 3 is one embodiment of the invention alternating voltage sampling circuit figure;
Fig. 4 is one embodiment of the invention gear switch element circuit figure.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
As shown in Figure 1, for the example structure block diagram of a kind of mutual inductor load box calibration equipment of the present invention, comprise: input power, power amplifier unit, gear switch unit, sampling unit, main system module, wherein: described input power connects described power amplifier unit, the input end main system module of described power amplifier unit, described power amplifier unit output terminal connects the input end of described gear switch unit, the output terminal of described gear switch unit connects the input end of described sampling unit, and the output terminal of described sample circuit connects the input end of described main system module; The power source of described power amplifier unit to input amplifies, and the signal after amplifying is passed to described gear switch unit, described gear switch unit is according to power input source size, and automatically select voltage or electric current gear, the value making measuring-signal be transferred to sampling unit remains in input range; Described sampling unit is sampled to the voltage of input or current signal, converts digital signal to and be transferred to described main system module through A/D; Described main system module processes in real time to the data gathered, and is shown by display unit; Described main system module carries out controlling of sampling by described power amplifier unit simultaneously.
As shown in Figure 2, for the schematic block circuit diagram of the present invention one preferred embodiment, wherein input power adopts transformer linear power supply module 1, gear switch unit, sampling unit adopt accurate alternating voltage to sample and gear switch module 3, accurate alternating current sampling realizes with gear switch module 4, and display unit adopts liquid crystal screen module 2.Concrete, described device comprises: transformer linear power supply module 1, liquid crystal screen module 2, accurate alternating voltage sampling and gear switch module 3, accurate alternating current sampling and gear switch module 4, main system module 5, power amplifier unit 6.The sampling of described transformer linear power supply module 1, liquid crystal screen module 2, accurate alternating voltage is sampled and gear switch module 4, main system module 5, power amplifier unit 6 with gear switch module 3, accurate alternating current.Wherein, the power output end of transformer linear power supply module 1 is connected in parallel the power input of liquid crystal screen module 2, accurate alternating voltage is sampled and the power input of gear switch module 3, accurate alternating current are sampled and power input, the power input of main system module 5, the power input of power amplifier unit 6 of gear switch module 4.The liquid crystal signal output part of described main system module 5 connects the signal input part of color liquid crystal panel module 2; The alternating voltage input end of analog signal of main system module 5 connects the alternating voltage analog signal output of the sampling of accurate alternating voltage and gear switch module 3; The control signal wire of main system module 5 connects the control signal interface of the sampling of accurate alternating voltage and gear switch module 3; The alternating current input end of analog signal of main system module 5 connects the alternating current analog signal output of the sampling of accurate alternating current and gear switch module 4; The control signal wire of main system module 5 connects the control signal interface of the sampling of accurate alternating current and gear switch module 4; The power source of power amplifier unit 6 to input amplifies, and the signal after amplifying is passed to the sampling of accurate alternating voltage sample and gear switch module 4 with gear switch module 3, accurate alternating current, and main system module 5 carries out controlling of sampling by power amplifier unit 6 simultaneously.The mutual inductor load box calibration equipment of the present embodiment formed thus is the integrated design and is on probationly proved to be easy to operate through manufacturing experimently, and volume is little, substantially increases the work efficiency of checker, alleviates its workload, meets the request for utilization of industry spot.
For ensureing measuring accuracy and reliable, by analog channel with measure channel separation.In analog channel, measuring voltage is sampled by accurate alternating voltage and gear switch module 3 is converted to small voltage signal, measure electric current sampled by current transformer and be converted into small voltage signal, the small-signal after AC analogue channel switch is sent in respective measurement channel carry out survey calculation respectively.Wherein analog channel also performs the gear automatic switching function in passage.
Described input power (transformer linear power supply module 1) adopts high power switching power supply, and this high power switching power supply is combined with voltage or the accurate sampling unit of electric current.High-power power source is adopted to be combined with volume limit for height accuracy standard table, high-power for voltage source and electric current high precision table are combined or be combined with voltage high accuracy table in high-power for electric current source, high-power source and standard scale is mostly adopted to adopt isolation technics in prior art, source is exactly source, table is that table is divided into two pieces, and electrodeless low (below 10mV) voltage high accuracy table.Voltage or electric current verification employing one road power amplifier unit time-sharing multiplex, this avoid the mutual interference between electric current and voltage, and reduce merging, calibration equipment volume also can do little, light, is easy to carry about with one.
Described high power switching power supply can adopt 0.05 step voltage or the high-power source of electric current.Electric current and voltage High-power amplifier, due to electric current and voltage amount limit for width, consider voltage maximum limit and minimum limit between influence each other, and how to ensure that large voltage limit and small voltage amount limit linearly and precision.Choose suitable gold-plated relay in the present embodiment, reduce the change switching sampling resistor in gear process, effectively ensure precision, adopt circuit to switch voltage swing amount limit simultaneously and open, reduce influencing each other between them.Choose suitable power amplifier, reduce small voltage amount limit and large voltage limit between Nonlinear Distortion.
Described gear switch unit (accurate alternating voltage sampling and gear switch module 3, accurate alternating current sampling and gear switch module 4) be provided with analog multichannel switch, large small voltage independently separates by this switch and chip 74HC595 pilot relay to be measured, change sample-and-hold circuit enlargement factor, according to input voltage size, the gear that automatic selection is suitable, as shown in Figure 4.The value making measuring-signal be transferred to analog to digital converter remains in input range, and alternating voltage gear can be adjusted between 100V to 10mV like this, electric current gear adjusts between 5A to 10mA.
In another preferred embodiment of the present invention, described sampling unit (accurate alternating voltage sampling and gear switch module 3, accurate alternating current sampling and gear switch module 4) adopt accurate voltage or current sampling circuit, further, described accurate voltage or current sampling circuit can adopt successive approximation analog to digital conversion circuit, are provided with one 16 without losing code sampling analog to digital converter, internal conversion clock, a multi-functional serial interface port and a sampling hold circuit in this analog to digital conversion circuit.Concrete, described sampling unit can adopt AD7688 chip to realize, and this chip is a 16,500kSPS, Charge scaling, gradual approaching A/D converter (ADC), adopts 5V single supply (VDD) to power.The built-in extremely low power dissipation of this device, at a high speed, 16 without losing code sampling ADC, an internal conversion clock and multi-functional serial interface port, be also integrated with the sampling hold circuit of a low noise, wide bandwidth, extremely short aperture delay.At CNV rising edge, this device is sampled to the voltage difference between IN+ and IN-pin.Voltage swing on these two pins usually between 0V to REF, phase place is contrary.Reference voltage (REF) is provided by outside, is the highlyest set to supply voltage.Power consumption and handling capacity linearly variation relation.SPI compliant serial interface can also utilize SDI to input, and is attached in single three-wire type bus by several ADC with daisy-chain fashion, and provides an optional busy instruction.When adopting independent current source VIO, this device and 1.8V, 2.5V, 3V or 5V logical consistency.AD7688 adopts 10 pin μ SOIC to encapsulate or 10 pin QFN encapsulate (CSP wafer-level package), and operating temperature range is-40 DEG C to+85 DEG C.
Shown in accompanying drawing 3, ac signal acquisition main circuit will adopt 16 A/D converter AD7685, adopt independently 6 road A/D Acquisition Circuit, the sampled result of 6 road measuring-signals can be obtained simultaneously, CPLD EPM1270 is adopted to control 6 road A/D, respectively every road ac voltage signal and ac current signal are changed, and be sent to DSP ADI BF532 eventually through serial mode.Meanwhile, DSP controls display and control CPLD EPM1270, by realtime curve on liquid crystal display.
In an alternative embodiment of the invention, described main system module is also connected with display unit and input block, and described display unit can adopt the display devices such as liquid crystal display, and described input block can adopt the conventional input equipments such as keyboard.Further, EPM1270 chip is adopted to do LCD controller in the present embodiment, direct digital synthesizers frequency meter, and some expansions of periphery, comprising keyboard, knob etc.EPM1270 is the chip of altera corp MAXII series, the MAXII train that altera corp releases, and is the CPLD that cost is minimum so far.MAX II device have employed brand-new CPLD architecture, and in all CPLD series, unit I/O cost is minimum, least in power-consuming.MAX II has used the technology of low-power consumption, and compare with last generation MAX device, cost reduces half, and power is down to 1/10th, and capacity adds four times, and performance adds twice.
In another preferred embodiment of the present invention, described main system module adopts the design of ARM and DSP double-core, described DSP and analog to digital conversion circuit are responsible for AC portion and are sampled, calculate, and described ARM be responsible for direct current sampling and calculate and to voltage or current sample, calculating, calibration, storage calibration data and gear switch, finally direct current measurement instantaneous value is passed through SPI communication modes and DSP communication, thus make between alternating current-direct current, to adopt circuit strictly independently to separate, ensure reliability and the accuracy requirement of equipment.The collection of DSP primary responsibility voltage or current signal and FFT calculate, and voltage or electric current gear calculate and switch and man-machine interface and Keyboard Control, so both can alleviate the burden that DSP calculates, and can by table source separately, make between table source unaffected mutually again.
Described ARM can adopt chip LPC2114.
Described DSP adopts chip BF532 and ADI BF532 high-speed dsp, and this DSP has:
L1 storer on 84KB sheet, can be configured to: 48KB L1 command memory (SRAM/ high-speed cache); 32KB L1 data-carrier store (SRAM/ high-speed cache); 4KB L1 working storage (SRAM);
Parallel Peripheral Interface, supports ITU-R 656 video data format;
Two binary channels, full duplex synchronous serial ports, support 8 stereo I2S passages;
12 DMA passages, support one dimension or 2-D data transmission;
Memory Controller provides and the seamless link organizing outside SDRAM, SRAM, Flash or ROM more;
3 timer/counters, support PWM, pulsewidth and event count pattern;
Support
uART, SPI compatible port, event handler, real-time clock, WatchDog Timer;
PLL, there are 1 times ~ 63 times mini BGA package of frequency multiplication ability 160 pin (12mm × 12mm), 176 pins (24mm × 24mm) LQFP encapsulates, and the sparse PBGA Lead-free in Electronic Packaging of 169 pins (19mm × 19mm), more than technical grade temperature range is the fundamental characteristics of BF532, utilize its rich interface, debugging is convenient, and can extend out data-carrier store, the characteristic of program storage, microsystem can be embedded smoothly, be easy to carry out DFT and FFT and calculate.
Described main system module is provided with man-machine interface, and interface adopts Chinese character display, makes the interpersonal interface of equipment more convenient more humane, and completes real-time control task by real time operating system, can manual operation observe outside real time data.
In addition, described processor is connected to PC, real time operating system is added RS232 communications protocol interface, connect the planning standard instrument check system software on PC, just in real time data can be passed and use on host computer, if mix the communications protocol of tested equipment in check system software, just can draw in real time by the error of checking device, according to different tested equipment, mix different calibrating schemes, just can realize the full-automatic verification of various criterion equipment.Originally need the standard device that could verify of a time, only need now 1 hours just can complete, substantially reduce the time of verification, make verification accurately more efficient.
The key technical indexes of above-described embodiment device:
(1) alternating voltage exports
(2) alternating current exports
Apparatus of the present invention adopt table source Integral design, and be that a kind of Portable AC-DC measures integrated device, can realize real-time recorded data and calculate error, and operation is very simple, check-verifying period is short simultaneously, and verification is accurately more efficient, and volume is little, meets the requirement used.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. a mutual inductor load box calibration equipment, it is characterized in that, comprise: input power, power amplifier unit, gear switch unit, sampling unit, main system module, wherein: described input power connects described power amplifier unit, the input end main system module of described power amplifier unit, described power amplifier unit output terminal connects the input end of described gear switch unit, the output terminal of described gear switch unit connects the input end of described sampling unit, and the output terminal of described sample circuit connects the input end of described main system module; The power source of described power amplifier unit to input amplifies, and the signal after amplifying is passed to described gear switch unit, described gear switch unit is according to power input source size, and automatically select voltage or electric current gear, the value making measuring-signal be transferred to sampling unit remains in input range; Described sampling unit is sampled to the voltage of input or current signal, converts digital signal to and be transferred to described main system module through A/D; Described main system module processes in real time to the data gathered, and is shown by display unit; Described main system module carries out controlling of sampling by described power amplifier unit simultaneously.
2. mutual inductor load box calibration equipment according to claim 1, is characterized in that, described input power adopts high power switching power supply, and this high power switching power supply is combined with voltage or the accurate sampling unit of electric current; Adopt high-power power source, be combined with volume limit for height accuracy standard table, high-power for voltage source and electric current high precision table are combined or be combined with voltage high accuracy table in high-power for electric current source, voltage or electric current verification employing one road power amplifier unit time-sharing multiplex.
3. mutual inductor load box calibration equipment according to claim 1, it is characterized in that, described sampling unit adopts accurate voltage or current sampling circuit, described accurate voltage or current sampling circuit adopt successive approximation analog to digital conversion circuit, are provided with one 16 without losing code sampling analog to digital converter, internal conversion clock, a multi-functional serial interface port and a sampling hold circuit in this analog to digital conversion circuit.
4. the mutual inductor load box calibration equipment according to any one of claim 1-3, it is characterized in that, described main system module adopts the design of ARM and DSP double-core, described DSP and analog to digital conversion circuit are responsible for AC portion and are sampled, calculate, and described ARM be responsible for direct current sampling and calculate and to voltage or current sample, calculating, calibration, storage calibration data and gear switch, finally direct current measurement instantaneous value is passed through SPI communication modes and DSP communication, thus make between alternating current-direct current, to adopt circuit strictly independently to separate, ensure reliability and the accuracy requirement of equipment.
5. mutual inductor load box calibration equipment according to claim 4, is characterized in that, the collection of DSP primary responsibility voltage or current signal and FFT calculate, and voltage or electric current gear calculate and switch and man-machine interface and Keyboard Control.
6. want the mutual inductor load box calibration equipment described in 3 according to right, it is characterized in that, described gear switch unit is provided with analog multichannel switch, large small voltage independently separates by this switch and chip 74HC595 pilot relay to be measured, change sample-and-hold circuit enlargement factor, according to input voltage size, automatically select suitable gear, the value making measuring-signal be transferred to analog to digital converter remains in input range.
7. the mutual inductor load box calibration equipment according to any one of claim 1-3, is characterized in that, described main system module is provided with man-machine interface, and interface adopts Chinese character display, and completes real-time control task by real time operating system.
8. mutual inductor load box calibration equipment according to claim 7, it is characterized in that, described main system module is connected to the planning standard instrument check system software on PC further, data being passed in real time uses on host computer, mix the communications protocol of tested equipment in check system software, just can draw in real time by the error of checking device, according to different tested equipment, mix calibrating scheme, realize automatically verifying.
9. the mutual inductor load box calibration equipment according to any one of claim 1-8, it is characterized in that, described input power adopts transformer linear power supply module, described gear switch unit, sampling unit adopts accurate alternating voltage to sample and gear switch module, accurate alternating current sampling realizes with gear switch module, display unit adopts liquid crystal screen module, wherein: the power output end of transformer linear power supply module is connected in parallel the power input of liquid crystal screen module, the power input of accurate alternating voltage sampling and gear switch module, the power input of accurate alternating current sampling and gear switch module, the power input of main system module, the power input of power amplifier unit, the liquid crystal signal output part of described main system module connects the signal input part of color liquid crystal panel module, the alternating voltage input end of analog signal of main system module connects the alternating voltage analog signal output of the sampling of accurate alternating voltage and gear switch module, the control signal wire of main system module connects the control signal interface of the sampling of accurate alternating voltage and gear switch module, the alternating current input end of analog signal of main system module connects the alternating current analog signal output of the sampling of accurate alternating current and gear switch module, the control signal wire of main system module connects the control signal interface of the sampling of accurate alternating current and gear switch module, the power source of power amplifier unit to input amplifies, and the signal after amplifying is passed to the sampling of accurate alternating voltage sample and gear switch module with gear switch module, accurate alternating current, and main system module carries out controlling of sampling by power amplifier unit simultaneously.
10. mutual inductor load box calibration equipment according to claim 9, it is characterized in that, for ensureing measuring accuracy and reliable, by analog channel and measurement channel separation: in analog channel, it is small voltage signal that measuring voltage is sampled with gear switch module converts by accurate alternating voltage, measure electric current sampled by current transformer and be converted into small voltage signal, the small-signal after AC analogue channel switch is sent in respective measurement channel carry out survey calculation respectively.Wherein analog channel also performs the gear automatic switching function in passage.
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| CN201410548397.8A CN104316892A (en) | 2014-10-16 | 2014-10-16 | Transformer load box calibration device |
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| CN106772197A (en) * | 2017-01-05 | 2017-05-31 | 云南电网有限责任公司电力科学研究院 | Calibration device for load box of mutual inductor |
| CN106772197B (en) * | 2017-01-05 | 2019-11-01 | 云南电网有限责任公司电力科学研究院 | Calibration device for load box of mutual inductor |
| CN107422290A (en) * | 2017-09-13 | 2017-12-01 | 云南电网有限责任公司电力科学研究院 | A kind of device for being used to control mutual inductor load box gear switch |
| CN107422290B (en) * | 2017-09-13 | 2023-11-10 | 云南电网有限责任公司电力科学研究院 | Device for controlling shift switching of transformer load box |
| CN108646210A (en) * | 2018-05-18 | 2018-10-12 | 云南电网有限责任公司电力科学研究院 | current transformer load box calibration point switching device |
| CN111693925A (en) * | 2020-07-20 | 2020-09-22 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Current transformer detection operation platform and multi-position top-speed current transformer calibration system |
| CN112068062A (en) * | 2020-09-10 | 2020-12-11 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Mutual inductor calibration system and calibration method |
| CN112068062B (en) * | 2020-09-10 | 2023-01-03 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Mutual inductor calibration system and calibration method |
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Application publication date: 20150128 |