CN205176101U - Power frequency high voltage measurement device based on SF6 gas -insulated high voltage standard capacitor - Google Patents
Power frequency high voltage measurement device based on SF6 gas -insulated high voltage standard capacitor Download PDFInfo
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- CN205176101U CN205176101U CN201520821187.1U CN201520821187U CN205176101U CN 205176101 U CN205176101 U CN 205176101U CN 201520821187 U CN201520821187 U CN 201520821187U CN 205176101 U CN205176101 U CN 205176101U
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- operational amplifier
- power frequency
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- 239000003990 capacitor Substances 0.000 title claims abstract description 65
- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 238000004891 communication Methods 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims description 17
- 239000013307 optical fiber Substances 0.000 claims description 8
- 230000001052 transient effect Effects 0.000 abstract description 7
- 239000000835 fiber Substances 0.000 abstract 2
- 238000000691 measurement method Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Abstract
The utility model discloses a power frequency high voltage measurement device based on SF6 gas -insulated high voltage standard capacitor, including current -voltage converting circuit, capture card and fiber communication equipment, its characterized in that: still include high voltage standard capacitor, high voltage standard capacitor and the direct series connection of current -voltage converting circuit, the capture card is connected with voltage current converting circuit, gathers voltage current converting circuit's output voltage, communication is connected with the capture card to fiber communication equipment. The utility model provides a simple structure, small, the interference killing feature is strong, measurement accuracy is high, the transient state performance is good, do not have ferroresonance, receive the power frequency high voltage measurement device based on SF6 gas -insulated high voltage standard capacitor that temperature is minimum. This power frequency high voltage measurement technique also can form the testing arrangement who is used for the laboratory to draw high pressure signal in not only can being applied to the electric power system of each electric pressure.
Description
Technical field
The present invention relates to a kind of power frequency high voltage measuring technique, particularly relate to a kind of based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor.
Background technology
Existing power frequency high voltage measuring technique mainly comprises electromagnetic type (PT) and electric capacity or electric resistance partial pressure type sensing technology, also having there is comparatively advanced optics (OVT) primary voltage sensing technology in recent domestic, also has patent and document to propose primary voltage sensor a series of power frequency high voltage measuring technique means of electric capacity or resistance serial connection air core coil and electric capacity or resistance serial connection small current mutual inductor TA formation.
Electromagnetic potential mutual inductance technology has that accuracy of measurement in the range of linearity is high, manufacturing process is ripe, experimental check specification, have national standard can according to etc. advantage, but by the restriction of its sensor mechanism, main Problems existing has insulation system complexity, narrow dynamic range, easily causes that ferroresonance, volume are large, cost is high, low to weak-signal measurement precision, be vulnerable to outside environmental elements interference.
The sensing principle of electric capacity or electric resistance partial pressure type primary voltage sensing technology is based on electric capacity or electric resistance partial pressure principle, and tested high pressure is directly added on high voltage arm capacitor or resistance, then obtains the small voltage be directly proportional to a sub-high pressure in low-voltage arm.The shortcoming of electric capacity or electric resistance partial pressure type primary voltage sensing technology is the requirement cost of resistance capacitance higher, there is stray capacitance in capacitor and low-voltage lead, intrinsic standoff ratio is along with electric pressure difference is up to tens thousand of or hundreds thousand of times, low-pressure side transmits little secondary voltage signal, load capacity is limited, lead-in wire pressure drop affects measuring accuracy, is easily subject to the interference of the factor such as ambient temperature, magnetic field.Bulky capacitor is in parallel with high resistant to be existed and is detained electric charge, and affect transient error, complexity chosen by bulky capacitor parameter in parallel with small resistor and device, affects measuring accuracy.
Optics primary voltage sensing technology mainly utilizes the physical characteristics of optical material, is mainly divided into the electronic type voltage mutual inductance technology based on bubble Ke Ersi (Pockels) effect and back voltage effect type electronic type voltage mutual inductance technology.But owing to requiring high to material and checkout equipment, crystal is subject to the factor impacts such as vibrations, environment temperature, its stability and reliability need to strengthen further.
And based on the primary voltage mutual inductance technology that resistance or electric capacity are connected formed with air core coil or little TA, due to the introducing of little TA or air core coil, can impact mutual inductor precision and angular difference ratio to a certain extent.
Summary of the invention
In order to solve the problems of the prior art, the invention provides that a kind of structure is simple, volume is little, antijamming capability is strong, measuring accuracy is high, transient performance is good, without ferroresonance, temperature influence minimum based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor.
In order to solve the problem, the technical solution used in the present invention is:
Based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, comprise current-to-voltage converting circuit, capture card and optical fiber communication equipment, it is characterized in that: also comprise high voltage standard capacitor, described high voltage standard capacitor and current-to-voltage converting circuit are directly connected in series, described capture card is connected with voltage-current converter circuit, gather the output voltage of voltage-current converter circuit, described optical fiber communication equipment is connected with capture card and communicates.
Aforesaid based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, is characterized in that: described current-to-voltage converting circuit comprises TVS pipe, first order operational amplifier, second level operational amplifier, the first feedback resistance R
j, input resistance R
1with the second feedback resistance R
2, described first order opamp input terminal as the input end of current-to-voltage converting circuit after connecing TVS pipe, the output terminal of described first order operational amplifier is by the first feedback resistance R
jbe connected with first order operational amplifier reverse input end, the output terminal of described first order operational amplifier is by input resistance R
1be connected with second level operational amplifier reverse input end, second level operational amplifier positive input ground connection, the output terminal of described second level operational amplifier is by the second feedback resistance R
2be connected with second level operational amplifier reverse input end, the voltage that described second level operational amplifier output terminal exports is as the output voltage of the power frequency high voltage measurement mechanism based on high voltage standard capacitor.
Aforesaid based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, is characterized in that: at the first feedback resistance R
jboth sides are parallel with electric capacity C
j.
Aforesaid based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, is characterized in that: described current-to-voltage converting circuit input end is directly connected between high voltage standard capacitor end and the earth.
Aforesaid based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, is characterized in that: described high voltage standard capacitor adopts SF
6gas high pressure standard capacitor.
The beneficial effect that the present invention reaches:
1, the high voltage standard capacitor of known models in market is chosen, with each electric pressure in electric system with the use of, direct access ER effect voltage operational amplifier, input impedance due to operational amplifier is extremely low is approximately zero, eliminate complex numerically-error and the phase angle error of the primary voltage mutual inductor that air core coil or small current mutual inductor equivalence cause to the equivalent inductance of capacitor loop and equivalent resistance and error own, further increase the measuring accuracy of the power frequency high voltage measuring technique based on high voltage standard capacitor.
2, capacitor adopts high voltage standard capacitor, eliminate the impact of the environmental factors such as temperature on electric capacity, dielectric loss is minimum, make obtained input current signal more precise and stable, can choose simultaneously the high voltage standard capacitor of known models in market and line voltage with the use of, the design be can be applicable in the electric system of multiple voltage grade.
3, capacitance partial pressure type primary voltage sensing technology adopts small capacitances to connect with bulky capacitor and obtains minimum second divided voltage value by tap, intrinsic standoff ratio is along with the difference of electric pressure is up to tens thousand of or hundreds thousand of times, and be about several milliamperes based on power frequency high voltage measuring technique capacitance current under each electric pressure of high voltage standard capacitor, capacitor without tap extension line, and adopts SF
6gas insulated high voltage standard capacitor, reduces the impact of stray capacitance on measuring accuracy, greatly reduces the cost of capacitor simultaneously.
4, electric capacity or electric resistance partial pressure type primary voltage sensing technology are at low pressure end transmission voltage signal with lead-in wire, be vulnerable to ectocine and there is lead-in wire pressure drop, affect measuring accuracy, and adopt current delivery principle based on the power frequency high voltage measuring technique of high voltage standard capacitor, without lead-in wire pressure drop, antijamming capability is strong, and stability is high, eliminate high-voltage capacitor and be detained electric charge to the impact of voltage transformer (VT) transient characterisitics, there are good transient characterisitics.
5, the present invention has that temperature stability is good, structure is simple, cost is low, security is good, and volume is little, cost is low, it is meritorious not consume, can compensating reactive power, secondary input short do not damage mutual inductor and short circuit eliminate after can the advantage such as fast quick-recovery output voltage.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the power frequency high voltage measuring technique that the present invention is based on high voltage standard capacitor.
Fig. 2 is the embodiment structural drawing of current-to-voltage converting circuit of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1, be applied to the power frequency high voltage measuring technique based on high voltage standard capacitor of power frequency high voltage 220kV, 1 is high-voltage terminal, is directly connected to voltage bus, and 2 is current-to-voltage converting circuit, and 3 is SF
6gas high pressure standard capacitor, 4 is the earth, and 5 is capture card, and 6 is optical fiber communication equipment.Described SF
6gas high pressure standard capacitor 3 and current-to-voltage converting circuit 2 are directly connected in series, and described capture card 5 is connected with voltage-current converter circuit 3, the output voltage of collection voltage-current converter circuit 3, and described optical fiber communication equipment 6 is connected with capture card 5 and communicates.Described current-to-voltage converting circuit 3 input end is directly connected on SF
6between gas high pressure standard capacitor 3 end (low pressure end) and the earth 4.
Described current-to-voltage converting circuit comprises TVS pipe (Transient Suppression Diode), first order operational amplifier, second level operational amplifier, the first feedback resistance R
j, input resistance R
1with the second feedback resistance R
2, described first order opamp input terminal as the input end of current-to-voltage converting circuit after connecing TVS pipe, the output terminal of described first order operational amplifier is by the first feedback resistance R
jbe connected with first order operational amplifier reverse input end, at the first feedback resistance R
jboth sides are parallel with electric capacity C
j.The output terminal of described first order operational amplifier is by input resistance R
1be connected with second level operational amplifier reverse input end, second level operational amplifier positive input ground connection, the output terminal of described second level operational amplifier is by the second feedback resistance R
2be connected with second level operational amplifier reverse input end, the voltage that described second level operational amplifier output terminal exports is as the output voltage of the power frequency high voltage measurement mechanism based on high voltage standard capacitor.
In above-described embodiment, under can be applicable to each electric pressure of electric system for making this power frequency high voltage measuring technique, the high voltage standard capacitor can choosing known models and the line voltage that accesses with the use of, choose the high voltage standard capacitor place in circuit that temperature coefficient is little as far as possible, standard capacitor electric current
(C
hfor high voltage standard capacitor electric capacity, u
pfor primary side voltage), current-to-voltage converting circuit output voltage
(C
jfor integrating capacitor, u
qfor secondary side output voltage), u
pand u
qphase 180 °, corrects the small voltage signal obtaining being directly proportional to primary side voltage by operational amplifier.And gathered by capture card, obtain the object of primary side high voltage signal, current-to-voltage converter, optical fiber communication equipment and capture card all can be powered by low-side power, this power supply mode makes the reliability and stability of this power frequency high voltage measuring technique work obtain larger raising, and all has standard compliant approved product at home and abroad about capture card and optical fiber communication equipment.
High voltage standard capacitor of the present invention is gas-insulated, electric capacity is extremely stable, the change of the environmental factor such as air pressure and temperature can be ignored the impact of electric capacity, dielectric loss is minimum, and can choose the high voltage standard capacitor of known models and line voltage with the use of, this measuring technique be can be applicable in the electric system of each electric pressure.
After the present invention is connected in series ER effect electric pressure converter by high voltage standard capacitor, between firm access electrical network phase voltage and the earth, standard capacitor loop is directly scurried into by ER effect voltage operational amplifier, direct measurement standard condenser current, and changed into the small voltage signal be directly proportional to primary side high pressure, wherein the large I of voltage signal needs to adjust according to follow-up observing and controlling.
The present invention proposes to utilize gas-insulated three-electrode system high voltage standard capacitor electric capacity to stablize, tan θ < 10
-5feature, provide that a kind of structure is simple, volume is little, antijamming capability is strong, measuring accuracy is high, transient performance is good, without the minimum power frequency high voltage measuring technology based on high voltage standard capacitor of ferroresonance, temperature influence, and the power frequency high voltage measuring technology of each electric pressure of electric system can be applied to according to existing high voltage standard capacitor model, this power frequency high voltage measuring technique also can form the proving installation extracting high-voltage signal for laboratory simultaneously.
More than show and describe ultimate principle of the present invention, principal character and advantage.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, comprise current-to-voltage converting circuit, capture card and optical fiber communication equipment, it is characterized in that: also comprise high voltage standard capacitor, described high voltage standard capacitor and current-to-voltage converting circuit are directly connected in series, described capture card is connected with voltage-current converter circuit, gather the output voltage of voltage-current converter circuit, described optical fiber communication equipment is connected with capture card and communicates.
2. according to claim 1 based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, is characterized in that: described current-to-voltage converting circuit comprises TVS pipe, first order operational amplifier, second level operational amplifier, the first feedback resistance R
j, input resistance R
1with the second feedback resistance R
2, described first order opamp input terminal as the input end of current-to-voltage converting circuit after connecing TVS pipe, the output terminal of described first order operational amplifier is by the first feedback resistance R
jbe connected with first order operational amplifier reverse input end, the output terminal of described first order operational amplifier is by input resistance R
1be connected with second level operational amplifier reverse input end, second level operational amplifier positive input ground connection, the output terminal of described second level operational amplifier is by the second feedback resistance R
2be connected with second level operational amplifier reverse input end, the voltage that described second level operational amplifier output terminal exports is as the output voltage of the power frequency high voltage measurement mechanism based on high voltage standard capacitor.
3. according to claim 2 based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, is characterized in that: at the first feedback resistance R
jboth sides are parallel with electric capacity C
j.
4. according to claim 3 based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, is characterized in that: described current-to-voltage converting circuit input end is directly connected between high voltage standard capacitor end and the earth.
5. according to claim 2 based on SF
6the power frequency high voltage measurement mechanism of gas insulated high voltage standard capacitor, is characterized in that: described high voltage standard capacitor adopts SF
6gas high pressure standard capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520821187.1U CN205176101U (en) | 2015-10-22 | 2015-10-22 | Power frequency high voltage measurement device based on SF6 gas -insulated high voltage standard capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520821187.1U CN205176101U (en) | 2015-10-22 | 2015-10-22 | Power frequency high voltage measurement device based on SF6 gas -insulated high voltage standard capacitor |
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| Publication Number | Publication Date |
|---|---|
| CN205176101U true CN205176101U (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520821187.1U Active CN205176101U (en) | 2015-10-22 | 2015-10-22 | Power frequency high voltage measurement device based on SF6 gas -insulated high voltage standard capacitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203829A (en) * | 2015-10-22 | 2015-12-30 | 国家电网公司 | Power frequency high voltage measuring device of high voltage standard capacitor based on SF6 gas insulation |
| CN106199138A (en) * | 2016-08-30 | 2016-12-07 | 中广核达胜加速器技术有限公司 | A kind of for detecting accelerator electrode plate voltage and the device of frequency |
-
2015
- 2015-10-22 CN CN201520821187.1U patent/CN205176101U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105203829A (en) * | 2015-10-22 | 2015-12-30 | 国家电网公司 | Power frequency high voltage measuring device of high voltage standard capacitor based on SF6 gas insulation |
| CN106199138A (en) * | 2016-08-30 | 2016-12-07 | 中广核达胜加速器技术有限公司 | A kind of for detecting accelerator electrode plate voltage and the device of frequency |
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| GR01 | Patent grant |