CN201166686Y - Wide band high voltage intelligent resistance type current sensor - Google Patents
Wide band high voltage intelligent resistance type current sensor Download PDFInfo
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- CN201166686Y CN201166686Y CNU200820052356XU CN200820052356U CN201166686Y CN 201166686 Y CN201166686 Y CN 201166686Y CN U200820052356X U CNU200820052356X U CN U200820052356XU CN 200820052356 U CN200820052356 U CN 200820052356U CN 201166686 Y CN201166686 Y CN 201166686Y
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- shunt
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Abstract
The utility model discloses a wide-frequency and high-voltage intelligent resistance current sensor which is composed of the following components: a shunt (1) used for taking out voltage signals from a tested current circuit, a high voltage side signal processing device (2) used for converting analog voltage signals output by the shunt (1) into digital signals and carrying out arithmetic processing, a fiber communication group (5) used for connecting the high voltage side signal processing device (2) with a low voltage side digital display terminal (6), a high voltage side power supply (3) used for providing working power supply to the high voltage side signal processing device (2) and a high voltage isolating transformer (4) used for connecting the high voltage side power supply (3) with a low voltage side power supply network. The wide-frequency and high-voltage intelligent resistance current sensor has the advantages of wide frequency response range, AC and DC general use, wide validity test range, no magnetic saturation problem, no secondary open circuit high voltage danger, high measuring precision, high voltage-resistance, high linearity, low temperature drift, easy calibration and strong anti-interference ability. The wide-frequency and high-voltage intelligent resistance current sensor is applicable to places such as electric machine producing enterprises, electric machine research centers, electric machine testing centers, etc.
Description
Technical field
The utility model relates to a kind of wide band high pressure intelligent resistance type current sensor that is used for alternating current-direct current, variable-frequency motor measurement.
Background technology
Along with the development of converter technique, variable-frequency motor is used widely, because wide and contain complicated higher hamonic wave to the variable-frequency power sources reference frequency output of variable-frequency motor power supply, traditional mutual inductor can not satisfy electric parameters testing.Shunt is especially rolled over belt shunt, Disc Shunt, coaxial shunt etc., has frequency characteristic preferably, but because output is without isolation, generally dull and stereotyped shunt is tested as DC current at present, and folding belt shunt, Disc Shunt and coaxial shunt etc. generally are used for pulse current or dash current test, one termination the earth when its common feature is test.In addition, because the signal amplitude of shunt output is less, during rated current, its corresponding voltage signal is generally less than 250mV, and the way that traditional sensor separates with instrument causes signal transmission line longer, and signal is introduced various interference easily in longer Distance Transmission process, influence measuring accuracy.
The utility model content
The purpose of this utility model is to overcome deficiency of the prior art, provide a kind of traditional mutual inductor of shunt replacement that adopts to be used for the ac high-voltage high-current test, improve the wide band high pressure intelligent resistance type current sensor of measuring bandwidth, precision and interference free performance.
The technical solution of the utility model is: utilize shunt good frequency characteristic and linearity, adopt shunt to replace the senser element of traditional mutual inductor as the high-voltage alternating high-current test, metering circuit and shunt are combined closely, adopt floating ground structure, measurement data is uploaded to low-pressure side digital display terminal in the digital quantity mode by optical fiber and realizes signal transmission and high pressure isolation.
The utility model is made of following assembly: a shunt (1) that is used for taking out from tested current return voltage signal, analog voltage signal that is used for shunt (1) output changes the digital signal high-side signal treating apparatus (2) that row operation handles of going forward side by side into, one group of communication optical fiber group (5) that connects high-side signal treating apparatus (2) and low-pressure side digital display terminal (6), one is the high-pressure side power supply (3) that high-side signal treating apparatus (2) provides working power, a high voltage isolating transformer (4) that connects high-pressure side power supply (3) and low-pressure side power supply grid.
Described shunt (1) is selected flat shunt or folding belt shunt or Disc Shunt or coaxial-type shunt for use according to bandwidth requirement.
The former limit of described high voltage isolating transformer (4) and secondary are connected with low-pressure side power supply grid and high-pressure side power supply (3) respectively.
Described high-side signal treating apparatus (2) is made up of signal amplification circuit 2D, AD converter IC1, microprocessor IC2, serial data transmitter 2C.
Described high-side signal treating apparatus (2) also comprises a kind of among sampling clock receiver 2A or the Gbps serial receiver 2B or their combination.
Described communication optical fiber group (5) is made up of at least one communication optical fiber 5C, and communication optical fiber 5C is connected with serial data transmitter 2C and low-pressure side digital display terminal (6) in the high-side signal treating apparatus (2).
Described communication optical fiber group (5) also comprises one or their combination among communication optical fiber 5A or the communication optical fiber 5B, wherein communication optical fiber 5A is connected with sampling clock receiver 2A and low-pressure side digital display terminal (6), and communication optical fiber 5B is connected with Gbps serial receiver 2B and low-pressure side digital display terminal (6).
The utlity model has that frequency response range is wide, AC/DC universal, Validity Test wide ranges, no magnetic saturation problem, Keep Clear-High Voltage for no second open circuit, measuring accuracy height, high linear, advantage such as low temperature floats, easily calibration, isolation voltage height, antijamming capability are strong, is suitable for places uses such as motor manufacturing enterprise, motor research and motor inspection center.
Description of drawings
Fig. 1 is the utility model functional-block diagram;
Fig. 2 is the circuit diagram of embodiment 1;
Fig. 3 is the circuit diagram of embodiment 2;
Fig. 4 is the circuit diagram of embodiment 3;
Fig. 5 is the circuit diagram of embodiment 4;
Fig. 6 is the circuit diagram of embodiment 5.
Among the figure: 1-shunt, 2-high-side signal treating apparatus, 3-high-pressure side power supply, 4-high voltage isolating transformer, 5-communication optical fiber group, 6-low-pressure side digital display terminal.
Among Fig. 6: S1-1 wide band high pressure intelligent resistance type current sensor, S2-2 wide band high pressure intelligent resistance type current sensor.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
Because microprocessor IC2 and IC3 have all used serial data receiving end RXD0 and serial data transmit port TXD0 among the embodiment, for convenience of description, are labeled as 2-RXD0,2-TXD0,6-RXD0,6-TXD0 among the figure respectively; Also adopt serial data receiving end RXD1 and the serial data transmit port TXD1 of IC3 among the embodiment 5, be labeled as 6-RXD1,6-TXD1.
Embodiment 1: see figures.1.and.2:
Present embodiment low-pressure side power supply grid adopts the AC220V civil power.
Shunt (1) is as current sense device, be connected on tested current return I+, the I-two ends, with tested current transitions is that millivolt level analog voltage signal inserts high-side signal treating apparatus (2), the analog voltage signal that high-side signal treating apparatus (2) is exported shunt (1) changes digital signal union processing back into and is uploaded to low-pressure side digital display terminal (6) by optical fibre set (5), high-pressure side power supply (3) provides working power for high-side signal treating apparatus (2), and the former limit of high voltage isolating transformer (4) and secondary link to each other with AC220V civil power and high-pressure side power supply (3) respectively.
In the present embodiment, shunt (1) adopts coaxial shunt R1, and resistance value is about 37u Ω, and signal bandwidth is not less than 100kHz, and the continuous current measurement range is 0～2000A, and the short-time overload electric current can reach 4000A.
In the present embodiment, high-pressure side power supply (3) adopts the typical linear power supply, constitute (having omitted devices such as filter capacitor among the figure) by transformer T1, rectifier bridge B1, B2 and three-terminal regulator block V1, V2, V3 etc., for high-side signal treating apparatus (2) provides working power.
The former limit of high voltage isolating transformer (4) and secondary are connected with AC220V civil power and high-pressure side power supply (3) respectively, in the present embodiment, the former limit of high voltage isolating transformer (4) and the secondary turn ratio are 1: 1, the isolation of former limit and secondary is withstand voltage to be not less than 20kV, the high-tension measurement side (comprise tested current return, shunt 1, high-side signal handle adorn 2, high-pressure side power supply 3) and the AC220V civil power between play the high pressure buffer action.
Present embodiment communication optical fiber group (5) is made up of three communication optical fiber 5A, 5B, 5C, 5A connects 2A and 6A, 5B connects 2B and 6B, 5C connects 2C and 6C, and communication optical fiber group (5) plays data communication between high-side signal treating apparatus (2) and low-pressure side digital display terminal (6) and high pressure is isolated.
Present embodiment low-pressure side digital display terminal (6) is made up of sampling clock transmitter 6A, serial data transmitter 6B, Gbps serial receiver 6C, microprocessor IC3 and data presentation device 6D, described 6A, 6B adopt fiber optic transmitter HFBR-1521, electrify/the light transformation, 6C adopts fiber optic receiver HFBR-2521, play light/electric transformation, IC3 adopts single-chip microcomputer CY7C68013, and 6D adopts computing machine.The electric signal input end of sampling clock transmitter 6A links to each other with the T0OUT pin of microprocessor IC3, the electric signal input end of serial data transmitter 6B links to each other with the 6-TXD0 of microprocessor IC3, and the electrical signal of Gbps serial receiver 6C links to each other with the 6-RXD0 of microprocessor IC3; CY7C68013 contains a USB communication interface, adopts USB cable to be connected between microprocessor IC3 and the computing machine 6D, realization high-speed data communications between the two.
Principle of work is as follows:
Flow through shunt (1) back of tested voltage source produces a millivolt magnitude voltage signals, the millivolt magnitude voltage signals produces peak value and is input to A/D converter IC1 less than the 10V voltage signal after signal amplification circuit 2D amplifies, IC3 produces sampled clock signal through 6A, 5A, the A/D conversion starting signal CONVSTA of 2A control IC1, start the A/D conversion, during the A/D EOC, IC2 reads the A/D transformation result, and the A/D transformation result carried out calculation process, data after the calculation process in the asynchronous serial mode through 2C, 5C, 6C is uploaded to the IC3 of low-pressure side digital display terminal (6), IC3 will upload computing machine 6D by USB cable after the data processing that receive again, and computing machine 6D shows the real effective of tested current signal as required, the first-harmonic effective value, frequency, irregularity of wave form and real-time waveform etc.
Passing to IC3, IC3 under the various steering orders that computing machine 6D also can will need to be provided with by USB cable will instruct by reaching the IC2 of high-side signal treating apparatus (2) under 6B, 5B, the 2B again, in order to guarantee the communication reliability, also will reply instruction and be uploaded to IC3 by 2C, 5C, 6C after receiving instruction, IC3 will reply instruction again and be uploaded to computing machine 6D by USB cable.The typical case uses, wide band high pressure intelligent resistance type current sensor can adopt multiple kinds, the agreement that can select wherein a kind of user to be familiar with by this method setting, or wide band high pressure intelligent resistance type current sensor is uploaded information and can be comprised transient data bag, steady state data bag etc. or full detail, by the data upload that this method setting can only select the user to be concerned about, simplify the data communication of low-pressure side digital display terminal (6).
Embodiment 2:
With reference to omitted among the accompanying drawing 3:(figure with Fig. 2 in identical shunt 1, high-pressure side power supply 3, high voltage isolating transformer 4), present embodiment as different from Example 1, wide band high pressure intelligent resistance type current sensor is indifferent to the sampling instant of measured signal in the present embodiment, promptly do not need to sample with other signal Synchronization or make phase correlation, so high-side signal treating apparatus (2) saves sampling clock receiver 2A, communication optical fiber group (5) is saved communication optical fiber 5A, low-pressure side digital display terminal (6) is saved sampling clock transmitter 6A, A/D conversion starting signal CONVSTA with A/D converter IC 1 directly links to each other with the clock output pin OC1A of microprocessor IC2 simultaneously, provides sampled clock signal by IC2.
Embodiment 3:
With reference to omitted among the accompanying drawing 4:(figure with Fig. 2 in identical shunt 1, high-pressure side power supply 3, high voltage isolating transformer 4), present embodiment as different from Example 1, wide band high pressure intelligent resistance type current sensor need not to be provided with various instructions in the present embodiment, so high-side signal treating apparatus (2) saves Gbps serial receiver 2B, communication optical fiber group (5) is saved communication optical fiber 5B, low-pressure side digital display terminal (6) is saved serial data transmitter 6B.
Embodiment 4:
With reference to omitted among the accompanying drawing 5:(figure with Fig. 2 in identical shunt 1, high-pressure side power supply 3, high voltage isolating transformer 4), present embodiment as different from Example 1, wide band high pressure intelligent resistance type current sensor both had been indifferent to the sampling instant of measured signal in the present embodiment, do not need the user that it is carried out various instruction settings yet, so high-side signal treating apparatus (2) saves sampling clock receiver 2A, Gbps serial receiver 2B, communication optical fiber group (5) is saved communication optical fiber 5A, 5B, low-pressure side digital display terminal (6) is saved sampling clock transmitter 6A, serial data transmitter 6B.
Embodiment 5: with reference to accompanying drawing 1, Fig. 2 and Fig. 6:
Present embodiment adopts two wide band high pressure intelligent resistance type current sensors that the instantaneous value of the three-phase phase current Ia of the three-phase alternating current of no center line connection, Ib, Ic and effective value etc. are measured, S1 is No. 1 wide band high pressure intelligent resistance type current sensor among Fig. 6, and S2 is No. 2 wide band high pressure intelligent resistance type current sensors.
High-side signal treating apparatus (2) among S1, the S2 is identical with high-side signal treating apparatus (2) among Fig. 2.
Comprise two cover communication optical fiber groups in the present embodiment, three in every cover is designated as 5A1,5B1,5C1,5A2,5B2,5C2 respectively.
Present embodiment low-pressure side digital display terminal (6) is by sampling clock transmitter 6A1,6A2, serial data transmitter 6B1,6B2, Gbps serial receiver 6C1,6C2, microprocessor IC3 and data presentation device 6D form, described 6A1,6B1,6A2,6B2 adopt fiber optic transmitter HFBR-1521,6C1,6C2 adopt fiber optic receiver HFBR-2521, and IC3 adopts single-chip microcomputer CY7C68013, and 6D adopts computing machine.The electric signal input end of sampling clock transmitter 6A1,6A2 links together and links to each other with the T0OUT pin of microprocessor IC3.The electric signal input end of serial data transmitter 6B1 links to each other with the 6-TXD0 of microprocessor IC3, the electric signal input end of serial data transmitter 6B2 links to each other with the 6-TXD1 of microprocessor IC3, the electrical signal of Gbps serial receiver 6C1 links to each other with the 6-RXD0 of microprocessor IC3, and the electrical signal of Gbps serial receiver 6C2 links to each other with the 6-RXD1 of microprocessor IC3; CY7C68013 contains a USB communication interface, adopts USB cable to be connected between microprocessor IC3 and the computing machine 6D, realization high-speed data communications between the two.
Measuring principle:
The measuring-signal input end of wide band high pressure intelligent resistance type current sensor S1 links to each other with the Ia of tested three-phase alternating current, the measuring-signal input end of wide band high pressure intelligent resistance type current sensor S2 links to each other with the Ic of tested three-phase alternating current, the sampling clock transmitter 6A1 of described S1, S2 and the electric signal input end of 6A2 link together, the sampling clock source that is S1, S2 is identical, the IC1 of the high-side signal treating apparatus (2) of S1, S2 is under the control in same sampling clock source, and Ia, the Ic to the three-phase alternating current phase current carries out synchronized sampling respectively.For each instantaneous value of same sampling instant, Ia+Ib+Ic=0, be Ib=-(Ia+Ic), the IC3 of low-pressure side digital display terminal obtains all instantaneous values of Ia, Ib, Ic thus, again according to the calculating principle of effective value, calculate the effective value of Ia, Ib, Ic, other as irregularity of wave form etc., measuring principle is identical.
Above-mentioned two embodiment are by the China Metrology Accreditation of relevant department, and its measuring accuracy is better than 0.2 grade; Electric current follow-on test scope is 0～2000A, and the short-time overload electric current reaches 4000A; Signal bandwidth is DC～100kHz; The highest sample frequency is 250kHz; Serial transmission speed is 2Mbps; Isolation voltage is not less than 20kV.
Among above-mentioned two embodiment,, and improve the dielectric voltage withstand of high voltage isolating transformer (4), can further increase measuring current if reduce the resistance value of shunt (1).
Claims (7)
1. wide band high pressure intelligent resistance type current sensor, it is characterized in that, constitute by following assembly: a shunt (1) that is used for taking out voltage signal from tested current return, analog voltage signal that is used for shunt (1) output changes the digital signal high-side signal treating apparatus (2) that row operation handles of going forward side by side into, one group of communication optical fiber group (5) that connects high-side signal treating apparatus (2) and low-pressure side digital display terminal (6), one is the high-pressure side power supply (3) that high-side signal treating apparatus (2) provides working power, a high voltage isolating transformer (4) that connects high-pressure side power supply (3) and low-pressure side power supply grid.
2. wide band high pressure intelligent resistance type current sensor according to claim 1 is characterized in that described shunt (1) selects in flat shunt or folding belt shunt, Disc Shunt, the coaxial-type shunt any for use according to bandwidth requirement.
3. wide band high pressure intelligent resistance type current sensor according to claim 1 is characterized in that the former limit of described high voltage isolating transformer (4) and secondary are connected with low-pressure side power supply grid and high-pressure side power supply (3) respectively.
4. wide band high pressure intelligent resistance type current sensor according to claim 1 is characterized in that described high-side signal treating apparatus (2) is made up of signal amplification circuit 2D, AD converter IC1, microprocessor IC2, serial data transmitter 2C.
5. wide band high pressure intelligent resistance type current sensor according to claim 4 is characterized in that described high-side signal treating apparatus (2) also comprises a kind of among sampling clock receiver 2A or the Gbps serial receiver 2B or their combination.
6. wide band high pressure intelligent resistance type current sensor according to claim 1, it is characterized in that, described communication optical fiber group (5) is made up of at least one communication optical fiber 5C, and communication optical fiber 5C is connected with serial data transmitter 2C and low-pressure side digital display terminal (6) in the high-side signal treating apparatus (2).
7. wide band high pressure intelligent resistance type current sensor according to claim 6, it is characterized in that, described communication optical fiber group (5) also comprises one or their combination among communication optical fiber 5A or the communication optical fiber 5B, wherein communication optical fiber 5A is connected with sampling clock receiver 2A and low-pressure side digital display terminal (6), and communication optical fiber 5B is connected with Gbps serial receiver 2B and low-pressure side digital display terminal (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820052356XU CN201166686Y (en) | 2008-02-26 | 2008-02-26 | Wide band high voltage intelligent resistance type current sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CNU200820052356XU CN201166686Y (en) | 2008-02-26 | 2008-02-26 | Wide band high voltage intelligent resistance type current sensor |
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| CN201166686Y true CN201166686Y (en) | 2008-12-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102947713A (en) * | 2010-01-28 | 2013-02-27 | 马克西姆综合产品公司 | Isolated current sensor with codec |
| CN105301332A (en) * | 2015-11-27 | 2016-02-03 | 云南电网有限责任公司电力科学研究院 | High potential pulse small current signal measuring system |
-
2008
- 2008-02-26 CN CNU200820052356XU patent/CN201166686Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102947713A (en) * | 2010-01-28 | 2013-02-27 | 马克西姆综合产品公司 | Isolated current sensor with codec |
| CN105301332A (en) * | 2015-11-27 | 2016-02-03 | 云南电网有限责任公司电力科学研究院 | High potential pulse small current signal measuring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHANG HAIYAN Free format text: FORMER OWNER: XU WEIZHUAN Effective date: 20090612 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090612 Address after: Hunan province Changsha Kaifu District Sifangping, Ginkgo Garden Court 18 Building No. 1108, zip code: 410073 Patentee after: Zhang Haiyan Address before: Hunan province Changsha Kaifu District Sifangping, Ginkgo Garden Court 18 Building No. 1108, zip code: 410073 Patentee before: Xu Weizhuan |
|
| CX01 | Expiry of patent term |
Granted publication date: 20081217 |
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| CX01 | Expiry of patent term |