CN2200823Y - Numerical transmission type scene used medium loss element and capacitance tester - Google Patents
Numerical transmission type scene used medium loss element and capacitance tester Download PDFInfo
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- CN2200823Y CN2200823Y CN 94217736 CN94217736U CN2200823Y CN 2200823 Y CN2200823 Y CN 2200823Y CN 94217736 CN94217736 CN 94217736 CN 94217736 U CN94217736 U CN 94217736U CN 2200823 Y CN2200823 Y CN 2200823Y
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Abstract
The utility model relates to a numerical transmission type scene used medium loss element and capacitance tester. The structure of the utility model has two kinds: a first kind is a digitized serial transmission system, which is composed of a double-single chip microcomputer, a phase discrimination circuit, an amplitude value testing circuit and a serial transmission path of digital withstanding high voltage. A second kind is a digitized transmission system, which is composed of a multipath remote control module-odd single chip microcomputer, a multipath switch, the phase discrimination circuit and a serial analogue-digital conversion circuit and a transmission path of digital withstanding high voltage. The design has the advantages of little non-linear distortion, good interference immunity, somewhat compact structure, automatical testing and easier making, etc.
Description
The utility model relates to a kind of High-Voltage Insulation dielectric testing of carrying out at the scene, automatically the tester of tested media loss factor and electric capacity; When specially referring to a kind of use opposition method test ground connection test product, adopt the medium consumption factor and the capacitance tester of digitizing transmission.
In recent years, the medium consumption factor tg δ that can use at the scene and the electric capacity C that have single chip microcomputer
xTester is progressively substituting traditional hand-adjusting type instruments such as high-pressure resistant bridge.Tg δ and C have been realized
xThe automatic test of parameter.They often adopt the structure of simulation photoconduction transmission system to realize the opposition method test, because that simulation photoconduction ubiquity nonlinear distortion is big, problem such as its photoelectric device is easily aging has influenced the stability and the system linear degree of this type instrument; And the special processing of its used simulation photocon need, not only increase the difficulty of manufacture craft but also increased cost.Abroad also have some medium consumption factors and capacitance tester to occur in recent years, but its complex structure involves great expense, limited its large tracts of land and promoted with digitizing guide type.
The purpose of this utility model provides a kind of simple and reasonable digitizing mode transmission scene with medium consumption factor and capacitance tester, with the weak point that tester and existing digit guide type tester exist, satisfy the actual needs of on-the-spot test work with the scene that overcomes above-mentioned simulation photoconduction mode transmission.
For reaching this purpose, the total design of this tester is: under the control of single chip microcomputer, in the high-pressure side unit with the ground far away side test product signal of reversal connection and between far the side standard signal is transformed into them phase differential and amplitude than relevant digital signal, be sent to the earth terminal unit by the digitizing transmission system, calculate, show tg δ and C value through single chip microcomputer.Its technical solution has following two kinds:
First kind, with two single chip microcomputers is principal character digitized signal serial transmission structure, the high-pressure side unit has: single chip microcomputer, phase discriminator, amplitude detection circuit and driving circuit, receiving circuit, wherein the signal that produced of phase discriminator and amplitude detection circuit is sent into single chip microcomputer, and two serial ports of single chip microcomputer are attached to driving circuit, receiving circuit respectively; Earth terminal unit: have single chip microcomputer, phase discriminator, amplitude detection circuit and driving circuit, receiving circuit, wherein the signal that produced of phase discriminator and amplitude detection circuit is sent into single chip microcomputer, and two serial ports of single chip microcomputer are attached to driving circuit and receiving circuit respectively; Between high-pressure side unit and earth terminal unit, two reverse each other digital high pressure resistant transmission channels are arranged, the one bar is high pressure resistant data transmission path, another is high pressure resistant remote control path, has transmitter or transceiver at their each end.These transmitters or transceiver respectively pass to the single chip microcomputer serial port of high-pressure side unit and earth terminal unit with it driving circuit, receiving circuit link, to carry out serial data transmission.
Second kind, so that the multichannel remote control module-only the sheet microcomputer is the digitized signal transmission structure of principal character.The high-pressure side unit has: multichannel remote control module receiving circuit, driving circuit, multi-way switch and phase discriminator, serial a/D converter circuit, and wherein the signal that produced of phase discriminator and serial a/D converter circuit is delivered to data drive circuit by the multi-way switch that is subjected to the control of multichannel remote control module receiving circuit; The earth terminal unit has: single chip microcomputer, data receiver circuit, multichannel remote control module transtation mission circuit and multi-way switch, phase discriminator, wherein, the signal that signal that produces in the phase discriminator and data receiver circuit receive is sent into single chip microcomputer by multi-way switch, and near-earth side-draw sample signal is sent into single chip microcomputer through multi-way switch in addition; Two reverse each other digital high pressure resistant transmission channels are arranged between high-pressure side unit and earth terminal unit: the one bar is high pressure resistant data transmission path, its end is a transmitter, the other end is a transceiver, this transmitter and high-pressure side unit mileage link according to driving circuit, this transceiver then links according to receiving circuit with earth terminal unit mileage, another is high pressure resistant remote control path, the one end is a transmitter, the transtation mission circuit of multichannel remote control module links in this transmitter and the earth terminal unit, the other end is a transceiver, and the multichannel remote control module receiving circuit in this transceiver and the high-pressure side unit links.
More than two kinds of structures have the following advantages: between (one), high-pressure side unit to the earth terminal unit what transmitted is digitized signal, this just overcomes the nonlinear distortion of simulated transmission and easy defective such as aging, improves the machine system linearity and stability.(2), the design has and makes relatively easy characteristics, be beneficial to the batch process of tester and can reduce cost.(3), the direct measurement electrical angle that this tester adopted with survey amplitude than the measuring method of asking tg δ and C, compare with tester with existing digital guide type medium consumption factor and electric capacity scene, its circuit level height, seem simple compact, can be made into portable instrument, be easy to realize full-automatic testing, also be easier to improve its anti-at the scene highfield interference performance, its precision can reach on-the-spot test product test specification requirement.
Below in conjunction with accompanying drawing the design is elaborated.
Fig. 1 is the theory diagram of two single chip microcomputer structures,
Fig. 2 is the theory diagram of sheet micro-architecture of multichannel remote control module-only.
［ embodiment 1: two single chip microcomputer structures ］
With reference to Fig. 1: signal sampling device has 4: be serially connected with the near-earth side standard signal sampler (n between normal component (N) and the ground
u), be serially connected with normal component (N) and experiment power supply (U
S) high-pressure side between ground far away side standard signal sampler (n
h), be serially connected with test product (C
x) and ground between near-earth side test product signal sampling device (x
i) and be serially connected with test product (C
x) and experiment power supply (U
S) high-pressure side between ground far away side test product signal sampling device (x
h).
High-pressure side unit (2) includes: single chip microcomputer (2.4), phase discriminator (2.2), amplitude detection circuit (2.3) and with the joining driving circuit of single chip microcomputer (2.4) serial port (2.5.1), receiving circuit (2.5.2).
Earth terminal unit (3) includes: single chip microcomputer (3.4), phase discriminator (3.2), amplitude detection circuit (3.3) and with the joining receiving circuit of serial port (3.5.2), the driving circuit (3.5.1) of single chip microcomputer (3.4).
Article two, reverse each other high pressure resistant data transmission path (5) and high pressure resistant remote control path (6) are connected between high-pressure side unit (2) and earth terminal unit (3).One end of high pressure resistant data transmission path (5) is to be and the joining photosensitive tube of receiving circuit (3.5.2) (5.2) with the joining luminotron of driving circuit (2.5.1) (5.1), the other end.One end of high pressure resistant remote control path (6) is that the luminotron (6.1), the other end that are connected with driving circuit (3.5.1) are and the joining photosensitive tube of receiving circuit (2.5.2) (6.2).Here luminotron (5.1), (6.1) and photosensitive tube (5.2), (6.2) constitute transmitter, the transceiver of its place transmission channel.The basic structure of more than having formed the digitizing photoconduction serial transmission system of this instrument.
In order to improve instrument performance, high-pressure side unit (2) also include: multi-way switch (SW2.1) and test product signal codan (2.1.1), standard signal codan (2.1.2).Also include in lining, earth terminal unit (3): multi-way switch (SW3.1) and test product signal codan (3.1.1), standard signal codan (3.1.2).
During positive connection, multi-way switch (SW3.1) is under the manipulation of single chip microcomputer (3.4), 4. the contact is connected, 6. the contact is also connected, 5. the contact disconnects, near-earth side test product signal and near-earth side standard signal enter test product signal codan (3.1.1) and standard signal codan (3.1.2), go to disturb the back signal respectively to be divided into two the road and enter phase discriminator (3.2) and amplitude detection circuit (3.3) simultaneously.Under the cooperation of phase discriminator (3.2) and single chip microcomputer (3.4), single chip microcomputer (3.4) is measured the phase angle between test product-standard signal, under the cooperation of amplitude detection circuit (3.3) and single chip microcomputer (3.4), single chip microcomputer (3.4) is measured the amplitude ratio between test product-standard signal.According to day computing method that Kawaguchi proposed, can further calculate tg δ and C by single chip microcomputer (3.4).Its concrete computing method can be referring to hydraulic and electric engineering publishing house, ［ day ］ electric association " Insulation Test method handbook, P543-P544.
During opposition method, handle at single chip microcomputer (2.4) that 1. contact in the multi-way switch (SW2.1) is down connected, 3. the contact is connected, 2. the contact disconnects, far side test product signal and far the side standard signal passes through its codan (2.1.1) respectively, (2.1.2) imports phase discriminator (2.2) and amplitude detection circuit (2.3) after going to disturb.Through the computing method of single chip microcomputer (2.4) according to above-mentioned ［ day ］ Kawaguchi, primary Calculation goes out the intermediate result of tg δ and C, and the serial communication that passes through high pressure resistant data transmission path (5) and high pressure resistant remote control path (6) then transfers to single chip microcomputer (3.4) to carry out sending demonstration after the data processing.
After above-mentioned measurement process was finished, single chip microcomputer (3.4) was handled multi-way switch (SW3.1) during positive connection; Single chip microcomputer during reversal connection (3.4) and single chip microcomputer (2.4) are handled multi-way switch (SW2.1) jointly and are entered the correction process, the intermediate result data of measuring process are revised, to improve the precision of instrument.
［ embodiment 2: the sheet micro-architecture of multichannel remote control module-only ］
With reference to Fig. 2: high-pressure side unit (2) comprise: multichannel remote control module receiving circuit (K.2) and be subjected to multi-way switch (SW2.2), (SW2.3), data drive circuit (G.1) and phase discriminator (2.2), the serial a/D converter circuit (2.3) of its control.Earth terminal unit (3) comprises: single chip microcomputer (3.4) and the multichannel remote control module transtation mission circuit (K.1), data receiver circuit (G.2), multi-way switch (SW3.2), (SW3.3) and the phase discriminator (3.2) that are subjected to its control.Between high-pressure side unit (2) and earth terminal unit (3), a high pressure resistant data transmission path (5) and a high pressure resistant remote control path (6) are arranged.One end of high pressure resistant data transmission path (5) is luminotron (5.1), and this luminotron and data drive circuit (G.1) link; The other end is photosensitive tube (5.2), and this photosensitive tube and data receiver circuit (G.2) link.One end of high pressure resistant remote control path (6) is luminotron (6.1), and this luminotron and multichannel remote control module transtation mission circuit (K.1) link; The other end is photosensitive tube (6.1), and this photosensitive tube and multichannel remote control module receiving circuit (K.2) link.Here luminotron (5.1), (6.2) and photosensitive tube (5.2), (6.2) constitute transmitter, the transceiver of its high pressure resistant transmission channel in place.
For improving instrument performance, high-pressure side unit (2) also include: multi-way switch (SW2.1), test product signal codan (2.1.1), standard signal codan (2.1.2).Earth terminal unit (3) also includes: multi-way switch (SW3.1), test product signal codan (3.1.1), standard signal codan (3.1.2).
When positive connection was tested, near-earth side test product sampled signal and standard signal entered phase discriminator (3.2) and produce test product-standard phase differential combined square wave string respectively through its codan (3.1.1), (3.1.2).At this moment single chip microcomputer (3.4) makes the contact in the multi-way switch (SW3.2)
Conducting, contact
Disconnect, (3.4) that phase differential combined square wave string enters single chip microcomputer are interface (HS1.0) and (HS1.1), thereby calculates test product-standard phase differential by the width that single chip microcomputer is measured its square wave.And test product and the standard signal exported from test product, standard signal codan (3.1.1), (3.1.2) enter multi-way switch (SW3.3), under the manipulation of single chip microcomputer (3.4), and the contact in the multi-way switch (SW3.3)
And contact
Timesharing ground is break-make alternately, near-earth test article signal or standard signal timesharing is selected and recommended (A/D) interface of single chip microcomputer (3.4), thereby calculate its amplitude ratio.
According to the computing method of ［ day ］ Kawaguchi in the foregoing description 1, single chip microcomputer (3.4) can calculate tg δ and C.
During the opposition method test, single chip microcomputer (3.4) makes contact in the multi-way switch (SW3.2)
Connect and make the contact
Disconnect, at this moment (HS1) interface of single chip microcomputer (3.4) transfers to receive the digitized signal from high-pressure side unit (2).In lining, high-pressure side unit (2), from side test product signal sampling device (x far away
h) take out and from side standard signal sampler (n far away
h) analog voltage signal that takes out, through codan (2.1.1) separately, (2.1.2) go to disturb after, the one tunnel enters phase discriminator (2.2) produces test product-standard phase differential combined square wave string; Another route multi-way switch (SW2.2) is is successively selected and recommended to serial a/D converter circuit (2.3) and is converted the test product serial mould-number train of impulses relevant with sampled signal, standard serial mould-number train of impulses to.Single chip microcomputer (3.4) is handled multi-way switch (SW2.2), (SW2.3) and above-mentioned square wave train, train of impulses timesharing are taken turns gating is gone into it and import (HS1.0) and (HS1.2) interface at a high speed, and single chip microcomputer (3.4) calculates tg δ and C and send demonstration.Its computing method are identical with positive connection.
In order to eliminate the difference between test product and the standard signal flow process passage, after the measurement process, single chip microcomputer (3.4) was handled multi-way switch (SW3.1) in the ground units (3) when positive connection was tested; Single chip microcomputer (3.4) is then handled multi-way switch (SW2.1) in the high-pressure side unit (2) during the opposition method test, to enter the correction process.
Among above-mentioned two embodiment: experiment power supply (U
S) provide by step-up transformer (PT).Its elementary unskilled labor frequency power that is connected to, the secondary high pressure side is generally 10KV-12KV, and a tap is arranged at the 2KV place.Primary side at step-up transformer (PT) is equipped with experiment power supply Input Control Element (1).This unit (1) has: overcurrent automatic control power supply switch (1.1), zero-cross triggering circuit (1.2), overvoltage crowbar (1.3) and anti-interference phase inverter (1.4).Zero-cross triggering circuit (1.2) can adopt solid-state relay (SSR) module, and overvoltage crowbar (1.3) can adopt (TWH33) assembly, and anti-interference phase inverter (1.4) is made of relay.Phase inverter (1.4) is subjected to the manipulation of single chip microcomputer (3.4), when measuring for the second time, make the input end paraphase of the logical power frequency supply of step-up transformer (PT), make tester promptly carry out work, improve the anti-at the scene highfield interference capability of instrument with current " the anti-interference method of paraphase ".Above-mentioned switch and assembly all can adopt the commercial goods.Normal component (N) can be made of high voltage standard capacitor, for example BR-16 type standard capacitor.Standard signal sampler (n
i), (n
h) can constitute by noninductive precision resistance.Near-earth side test product signal sampling device (x
i) can constitute by noninductive precision resistance and range selector; And side test product signal sampling device (x far away
h) can by noninductive precision resistance with have can the ceiling voltage of anti-test insulated handle range selector constitute.Above-mentioned each signal codan (2.1.1), (2.1.2) reach (3.1.1), (3.1.2) respectively is made up of an active low-pass filter.The circuit of lining, high-pressure side unit (2) is powered to it by high pressure resistant insulating power supply (7).High pressure resistant insulating power supply (7) both can also can be contained in the high-pressure side unit with high pressure resistant switch isolation power supply or with battery with high pressure resistant power frequency supply transformer.The commercial goods model of multichannel remote control module is a lot, for example MC145026, MC145027.Multi-way switch can adopt analog switch (for example MC4066), also can constitute with relay.The photoconduction formula both can have been adopted in above-mentioned each path (5), (6), also can adopt alternate manner, for example inductive coupling type, radiowave conduction.Phase discriminator (2.2), (3.2) are made of circuit and square-wave and the cascade of phase differential combinational circuit, and its physical circuit can adopt " electrical measurement and instrument " 89 years o. 11ths, circuit in " the digit phase tester of single chip microcomputer " literary composition or other circuit.
Among the embodiment 1, amplitude detection circuit (2.3), (3.3) can be made of (for example AD0808) the A/D converter with multi-way switch, also can be by multi-way switch and double integration A/D converter (for example MC14433) or V/F converter (for example LX331) cascade formation.Single chip microcomputer (2.4), (3.4) can be selected 8 or 16 single chip microcomputers for use, or on single chip microcomputer the configuration-system extended chip, for example extend out EEPROM, extend out the I/O interface and extend out RAM or the like.
Among the embodiment 2, single chip microcomputer (3.4) is selected 8 single chip microcomputer chips of enhancement mode or the employing MCS-96 of INTEL Corp. series even 196 family chips such as MOTOROLA company, PHILIPS company for use, because its inside has input (HSI) at a high speed, or timer with seizure logic, but also has multi-channel a/d converter, just can directly utilize these chip internal hardware resources and simplify the outer hardware circuit of joining of above-mentioned phase discriminator and amplitude detection circuit greatly, its physical circuit can adopt the typical circuit in the single chip microcomputer application manual of this chip companies.Serial a/D converter circuit (2.3.1) among this embodiment can adopt V/F converter (for example VFC32), also can adopt to have (I
2C) A/D converter of interface (for example PCF8591).
Claims (6)
1, a kind of digitizing mode transmission scene comprises with medium consumption factor and capacitance tester: high-pressure side unit, earth terminal unit is characterized in that:
High-pressure side unit (2) has: single chip microcomputer (2.4), phase discriminator (2.2), amplitude detection circuit (2.3) and driving circuit (2.5.1), receiving circuit (2.5.2), wherein the signal that produced of phase discriminator (2.2) and amplitude detection circuit (2.3) is sent into single chip microcomputer (2.4), and two serial ports of single chip microcomputer (2.4) are attached to driving circuit (2.5.1), receiving circuit (2.5.2) respectively;
Earth terminal unit (3) has: single chip microcomputer (3.4), phase discriminator (3.2), amplitude detection circuit (3.3) and driving circuit (3.5.1), receiving circuit (3.5.2), wherein the signal that produced of phase discriminator (3.2) and amplitude detection circuit (3.3) is sent into single chip microcomputer (3.4), and two serial ports of single chip microcomputer (3.4) are attached to driving circuit (3.5.1), receiving circuit (3.5.2) respectively;
Have high pressure resistant data transmission path (5) and high pressure resistant remote control path (6), and be connected between high-pressure side unit (2) and earth terminal unit (3).
2, tester according to claim 1, it is characterized in that said high-pressure side unit (2) also comprises: multi-way switch (SW2.1), test product signal codan (2.1.1), standard signal codan (2.1.2), wherein codan (2.1.1), (2.1.2) are plugged between multi-way switch (SW2.1) and phase discriminator (2.2), the amplitude detection circuit (2.3), and multi-way switch (SW2.1) is controlled by single chip microcomputer (2.4).
3, tester according to claim 1, it is characterized in that said earth terminal unit (3) also comprises: multi-way switch (SW.3.1), test product signal codan (3.1.1), standard signal codan (3.1.2), wherein codan (3.1.1), (3.1.2) are plugged between multi-way switch (SW3.1) and phase discriminator (3.2), the amplitude detection circuit (3.3), and multi-way switch (SW3.1) is controlled by single chip microcomputer (3.4).
4, a kind of digitizing mode transmission scene comprises with medium consumption factor and capacitance tester: high-pressure side unit, earth terminal unit is characterized in that:
High-pressure side unit (2) has: multichannel remote control module receiving circuit (K.2), data drive circuit (G.1), multi-way switch (SW2.2), (SW2.3) and phase discriminator (2.2), serial a/D converter circuit (2.3.1), and wherein the signal that produced of phase discriminator (2.2) and serial a/D converter circuit (2.3.1) is delivered to data drive circuit (G.1) by multi-way switch (SW2.2), (SW2.3) that is subjected to multichannel remote control module receiving circuit (K.2) control;
Earth terminal unit (3) has: single chip microcomputer (3.4), data receiver circuit (G.2), multichannel remote control module transtation mission circuit (K.1) and multi-way switch (SW3.2), (SW3.3), phase discriminator (3.2), wherein the signal of the signal of phase discriminator (3.2) generation and data receiver circuit (G.2) reception is sent into single chip microcomputer (3.4) by multi-way switch (SW3.3), and near-earth side-draw sample signal is sent into single chip microcomputer (3.4) through multi-way switch (SW3.3) in addition;
Have high pressure resistant data transmission path (5) and high pressure resistant remote control path (6), and be connected between high-pressure side unit (2) and earth terminal unit (3).
5, tester according to claim 4, it is characterized in that said high-pressure side unit (2) also includes: multi-way switch (SW2.1), test product undesired signal suppress circuit (2.1.1), standard signal codan (2.1.2), codan (2.1.1), (2.1.2) are plugged between multi-way switch (SW2.1) and phase discriminator (2.2), the serial a/D converter circuit (2.3.1), and multi-way switch (SW2.1) is controlled by multichannel remote control module receiving circuit (K.2).
6, tester according to claim 4, it is characterized in that said earth terminal unit (3) also includes: multi-way switch (SW3.1), test product signal codan (3.1.1), standard signal codan (3.1.2), codan (3.1.1), (3.1.2) are plugged between multi-way switch (SW3.1) and phase discriminator (3.2), the multi-way switch (SW3.3), and multi-way switch (SW3.1) is controlled by single chip microcomputer (3.4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94217736 CN2200823Y (en) | 1994-07-25 | 1994-07-25 | Numerical transmission type scene used medium loss element and capacitance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94217736 CN2200823Y (en) | 1994-07-25 | 1994-07-25 | Numerical transmission type scene used medium loss element and capacitance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2200823Y true CN2200823Y (en) | 1995-06-14 |
Family
ID=33833107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94217736 Expired - Fee Related CN2200823Y (en) | 1994-07-25 | 1994-07-25 | Numerical transmission type scene used medium loss element and capacitance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2200823Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313876A (en) * | 2010-07-05 | 2012-01-11 | 河南电力试验研究院 | Calibrating device for fully automated high-voltage dielectric loss tester |
-
1994
- 1994-07-25 CN CN 94217736 patent/CN2200823Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313876A (en) * | 2010-07-05 | 2012-01-11 | 河南电力试验研究院 | Calibrating device for fully automated high-voltage dielectric loss tester |
| CN102313876B (en) * | 2010-07-05 | 2013-07-10 | 河南省电力公司电力科学研究院 | Calibrating device for fully automated high-voltage dielectric loss tester |
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| CF01 | Termination of patent right due to non-payment of annual fee |