CN107621573A - A kind of dielectric dissipation factor standard of high stability - Google Patents
A kind of dielectric dissipation factor standard of high stability Download PDFInfo
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- CN107621573A CN107621573A CN201710687050.5A CN201710687050A CN107621573A CN 107621573 A CN107621573 A CN 107621573A CN 201710687050 A CN201710687050 A CN 201710687050A CN 107621573 A CN107621573 A CN 107621573A
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Abstract
The invention discloses a kind of dielectric dissipation factor standard of high stability, it is related to dielectric loss measurement equipment technical field in electrical equipment.The dielectric dissipation factor standard of the high stability, using electric capacity shunting RC dielectric loss models, it is in parallel with dielectric loss artifical resistance by bridging condenser, reduce the resistance and heating power of dielectric loss artifical resistance, so as to reduce the resistance of the resistor in stepping subelement and power, facilitate the type selecting of resistor, and without customized, the influence generated heat by resistor to resistance and precision is also eliminated simultaneously, avoids influenceing the stability and accuracy of test data；The present invention combines the dielectric loss value gear simulation realized more than stepping subelement number by controlling stepping subelement to carry out gear, greatly reduce the volume and weight of dielectric dissipation factor standard, so that structure is compacter, performance is relatively reliable and intelligent, is more suitable for the field-checking of production line.
Description
Technical field
The invention belongs to dielectric loss measurement equipment technical field in electrical equipment, more particularly to a kind of Jie of high stability
Matter loss factor standard device.
Background technology
The insulation system of electrical equipment is formed by various dielectrics, even in polarizable medium due to the conductance of medium
The bubble-discharge in friction and medium when extremely son rotates, the medium of the place of making under high voltages（Or whole insulation system）It is to have
Loss, this loss turns into dielectric loss, and it is the important indicator of insulation of electrical installation performance.Accident in power system has
Caused by being much due to Insulation Problems, in order to ensure the safe operation of power system, it is necessary to Insulation Test is carried out, and medium damages
Consumption measurement experiment is the very high Insulation monitoring experiment of a sensitivity.Dielectric dissipation factor standard is a kind of measurement dielectric loss
The self-reacting device of tangent and capacitance, by different stalls come mock standard dielectric loss value, to verify the measurement of dielectric loss instrument
Precision；Dielectric dissipation factor standard can be under power frequency high voltage, the various insulating materials of in-site measurement, insulating sleeve, electric power electricity
The Dielectric loss tangent value and capacitance of the high-tension apparatuses such as cable, capacitor, transformer, transformer, pole is applied in power system
To be frequent, verification task also burdensome.
The dielectric dissipation factor standard that electric bridge laboratory uses at present, mock standard dielectric loss is come with different gears（It is situated between
Matter is lost）Value, to verify the measurement accuracy of dielectric loss instrument.On the one hand, different dielectric loss value set need by standard by
Button switches over, and therefore, one group of data experiments terminates every time, is required for staff to frequently enter in high-potting fence and sets
Next group of medium loss test data, 30 groups of data of a dielectric loss instrument whole range are such as verified, need to enter in high pressure fence
30 settings of row could be completed；Testing crew enters high pressure fence, if instrument high pressure does not disconnect or electrion is insufficient, also
In the presence of by the danger of high-voltage electric shock；Using point-to-point control model, 30 groups of data need standard to have 30 gears, thus
Need 30 stepping subelements, so that the volume and weight increase of standard, improve cost of manufacture.On the other hand, it is traditional
Dielectric dissipation factor standard generally use RC series equivalent approach circuits, corresponding dielectric loss calculation formula is tan δ=ω RC,
So there is higher requirement to dielectric loss artifical resistance R.Such as standard capacitance C=100PF, when dielectric loss value is 10%,
The Ω of dielectric loss artifical resistance R=3183099, in calibration voltage 10KV（50HZ）Under, the voltage of the resistance generates heat close to 1000V
Power is about 0.31W, and to ensure stability, the power of the resistance should be more than 1W.And the resistance that precision is 0.1% 3M Ω leads to
It is often customized, and the ohmically voltage can not meet the requirement that circuit works in low potential close to 1000V.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of dielectric dissipation factor standard of high stability, using electricity
Hold shunting RC dielectric loss models, substantially reduce dielectric loss artifical resistance R power consumption, eliminate dielectric loss artifical resistance R
The influence generated heat to measurement data stability, improve the stability of dielectric dissipation factor standard.
The present invention is that solve above-mentioned technical problem by the following technical solutions：A kind of dielectric loss of high stability
Factor standard, including high-voltage terminal, standard capacitor, step resistance unit, CX terminals, bridging condenser, gear control
System and drive module, main control module, wireless communication module, display module, power module and remote control；The standard capacitance
Device one end is connected with high-voltage terminal, and the other end connects with one end of bridging condenser and the first of step resistance unit respectively
Line end is connected；The other end ground connection of the bridging condenser, the second terminals of step resistance unit are connected with CX terminals
Connect；3rd terminals of the step resistance unit are controlled with the gear and the output end of drive module is connected；The shelves
Position control and drive module input, display module, power module and wireless communication module respectively with main control module phase
Connection；The power module is also connected with display module and wireless communication module respectively；The wireless communication module with it is described
Remote control carries out radio communication.
Further, the step resistance unit is into the contact of the relay and institute by resistor and relay group
State capacitor in parallel and form a stepping subelement, each stepping subelement is sequentially connected in series the step resistance unit；Institute
State gear control and drive module the signal that main control module is sent is analyzed and handled, control stepping subelement is carried out
Gear combination realizes that the dielectric loss value gear more than stepping subelement number is simulated.
Further, the step resistance unit is sequentially connected in series by 11 stepping subelements, by gear control and
Drive module controls 11 stepping subelements to carry out gear combination, realizes 30 dielectric loss value gear simulations；Using gear group
Control strategy is closed, the combination switching of stepping subelement is controlled by gear control and drive module, it is only necessary to 11 stepping subelements
The simulation of 30 dielectric loss value gears can be achieved, make that the structure of dielectric dissipation factor standard is compacter, reliable, intelligence
Can, the volume and weight of dielectric dissipation factor standard is significantly reduced from the quantity of resistor, reduces and is fabricated to
This.
Further, the 3rd terminals of the step resistance unit are by optocoupler and the gear controls and drive module
Output end be connected, when by remote control send switching switch signal when, main control module sends control signal, the control
Signal is controlled through gear and the analysis and processing of drive module, produces combination switching switch controlling signal, combination switching switch
Control signal carrys out control relay action by optocoupler, avoids the formation of interference signal, ensures the normal operation of system.
Further, the standard capacitor uses SF6 standard capacitors, capacitance 100PF, and insulation against ground is
50KV；SF6 standard capacitors capacitance in itself and dielectric loss are extremely stable, and the change of air pressure and temperature, humidity is to electric capacity
Influence is very small, improves measurement accuracy.
Further, the power module is the power circuit being made up of lithium battery and charging circuit, for for each mould
Block provides electric energy；The lithium battery is the lithium battery group being made up of multiple lithium batteries, and multiple lithium batteries are carried out by sectional shelf-unit
It is fixed, and multiple lithium batteries are connected in series or parallel by nickel sheet；Lithium electric protection plate is welded with the multiple lithium battery；
The lithium battery group with lithium electric protection plate is fixedly mounted in battery-pack exterior casing, the battery-pack exterior casing be provided with charge port and
Discharge port, the output end of the charging circuit are connected with the charge port, and the discharge port is connected with the main control module
Connect.
Compared with prior art, the dielectric dissipation factor standard of high stability provided by the present invention, using electric capacity point
Streaming RC dielectric loss models, it is in parallel with dielectric loss artifical resistance by bridging condenser, reduce dielectric loss simulation electricity
The resistance and heating power of resistance, so as to reduce the resistance of the resistor in stepping subelement and power, facilitate the type selecting of resistor,
And without customized, while the influence generated heat by resistor to resistance and precision is also eliminated, avoid influenceing the stabilization of test data
Property and accuracy；The present invention realizes the medium more than stepping subelement number by controlling stepping subelement to carry out gear combination
Loss value gear is simulated, and greatly reduces the volume and weight of dielectric dissipation factor standard so that structure is compacter, performance
It is relatively reliable and intelligent, it is more suitable for the field-checking of production line.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, the required accompanying drawing used in being described below to embodiment
It is briefly described, it should be apparent that, drawings in the following description are only one embodiment of the present of invention, general for this area
For logical technical staff, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of the dielectric dissipation factor standard of high stability of the present invention；
Fig. 2 is the equivalent circuit diagram with bridging condenser after the resistor combination in stepping subelement of the present invention；
Wherein：1- high-voltage terminals, 2-CX terminals, 3- step resistance units, 4- bridging condensers, 5- standard capacitors, 6-
Resistor, 7- relays.
Embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the present invention is clearly and completely described,
Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Based in the present invention
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made,
Belong to the scope of protection of the invention.
As shown in figure 1, a kind of dielectric dissipation factor standard of high stability provided by the present invention, including high-voltage connection
End 1, standard capacitor 5, step resistance unit 3, CX terminals 2, bridging condenser 4, gear control and drive module, main control
Module, wireless communication module, display module, power module and remote control；The one end of standard capacitor 5 and the phase of high-voltage terminal 1
Connection, the other end are connected with one end of bridging condenser 4 and the first terminals of step resistance unit 3 respectively；Shunting electricity
The other end ground connection of container 4, the second terminals of step resistance unit 3 are connected with CX terminals 2；Step resistance unit 3
3rd terminals control with gear and the output end of drive module is connected；Gear controls and the input of drive module, display
Module, power module and wireless communication module are connected with main control module respectively；Power module also respectively with display module
It is connected with wireless communication module；Wireless communication module carries out radio communication with remote control；Damaged using electric capacity shunting RC media
Consume model, the introducing of bridging condenser 4 so that the resistor 6 in step resistance unit 3 can select conventional resistance, it is not necessary to
It is customized, it disclosure satisfy that the requirement of low potential work；The power consumption of resistor is greatly reduced simultaneously, is eliminated because of the heating pair of resistor 6
The influence of measurement data stability, improve the stability and measurement accuracy of dielectric dissipation factor standard.
Step resistance unit 3 is made up of resistor 6 and relay 7, and contact and the resistor 6 of relay 7 compose in parallel
One stepping subelement, each stepping subelement are sequentially connected in series step resistance unit 3；Gear controls and drive module is to master
The signal that control module is sent is analyzed and handled, and it is single more than stepping that control stepping subelement carries out gear combination realization
The dielectric loss value gear simulation of first number.
3rd terminals of step resistance unit 3 are controlled by optocoupler with gear and the output end of drive module is connected,
When sending the signal of switching switch by remote control, main control module sends control signal, and the control signal controls through gear
And the analysis and processing of drive module, combination switching switch controlling signal is produced, combination switching switch controlling signal passes through light
Coupling carrys out control relay action, avoids the formation of interference signal, ensures the normal operation of system.
Standard capacitor 5 uses SF6 standard capacitors；At work, the upper termination dielectric loss measuring instrument of SF6 standard capacitors
High-pressure side, the first terminals of lower termination step resistance unit 3 are connected；When not working, upper end is hanging；SF6 standard capacitances
The capacitance of device is 100PF, insulation against ground 50KV；SF6 standard capacitors capacitance in itself and dielectric loss are extremely stable,
Air pressure and temperature, the change of humidity are very small to capacitive effect, improve measurement accuracy.
Power module is the power circuit being made up of lithium battery and charging circuit, for providing electric energy for modules；Lithium
Battery is the lithium battery group being made up of multiple lithium batteries, and multiple lithium batteries are fixed by sectional shelf-unit, and multiple lithium batteries
It is connected in series or parallel by nickel sheet；Lithium electric protection plate is welded with multiple lithium batteries；Lithium battery with lithium electric protection plate
Group is fixedly mounted in battery-pack exterior casing, and battery-pack exterior casing is provided with charge port and discharge port, and the output end of charging circuit is with filling
Power port is connected, and discharge port is connected with main control module.
Main control module uses the control circuit being made up of STM32L411 chips, is sent for receiving wireless communication module
Signal, and analyzed and gear control and drive module be sent to after being handled；Gear control and drive module mainly by
STM32L151 chip circuits and gear drive circuit composition, the signal sent for receiving main control module, and analyze and process
The combination for so as to control the actuating of relay in step resistance unit 3, realizing multiple stepping subelements is exported afterwards, realizes that medium damages
Consume gear simulation；STM32L411 A0-A4 is encoded, and is encoded to 00000-11111, each corresponding dielectric loss value of coding,
Such as 00001 corresponding dielectric loss value 0.05；When STM32L411 sends 00001 instruction, STM32L151 receives coded command, and
Table look-up and find out the combination for the calibration resistor 6 for wanting switching（The table, which is that the coded command being logged in STM32L151 chips is corresponding, to be situated between
The program that calibration resistor 6 corresponding to damage value combines）, and gear drive circuit is issued instructions to, driven by gear drive circuit
Motor type relay is combined switching.
Wireless communication module, using 2.4G wireless communication modules, the gear switch signal sent for receiving remote control,
And it is transferred to main control module；Display module uses LCDs, the current work for display medium loss factor standard device
Make state.
Embodiment：
By taking the dielectric dissipation factor standard that 11 stepping subelements realize 30 dielectric loss value gear simulations as an example, definition point
Stream capacitor 4 is C2, and standard capacitor 5 is C1, the resistor 6 in 11 stepping subelements be respectively R1, R2, R3, R4, R5,
R6, R7, R8, R9, R10, R11, relay 7 are respectively J1, J2, J3, J4, J5, J6, J7, J8, J9, J10, J11, and stepping is single
The equivalent resistance that member carries out after gear combination is dielectric loss artifical resistance R.In the present embodiment, standard capacitor C1=
100PF, bridging condenser C2=1800PF, dielectric loss standard value are 0.000%, dielectric loss measurement scope：0.0005%~
10.00%（Totally 30 gears）.
As shown in Fig. 2 CX terminals are connected with the cored wire of dielectric loss instrument p-wire, equivalent circuit is dielectric loss artifical resistance
R is in parallel with bridging condenser C2, and dielectric loss artifical resistance R computing the resistor value expression formula is：
（1）
（2）
Wherein, k is diverting coefficient, and tan δ are Dielectric loss tangent value, and w is angular frequency, and C1 is the capacitance of standard capacitor, C2
For the capacitance of bridging condenser.It is now apparent dielectric loss, by formula when dielectric loss value takes maximum 10%（1）With（2）Can
So that R=169260 Ω, heating power 0.021W is calculated；Compared with traditional RC series connection dielectric loss models, electric capacity of the present invention
Dielectric loss artifical resistance R in shunting RC dielectric loss models is kilo-ohm grade, and dielectric loss is simulated in conventional model
Resistance R is megaohm grade（Refer to the description in background technology）, and the medium damage in electric capacity shunting RC dielectric loss models
It is to be combined by the resistor 6 of several stepping subelements and obtained to consume artifical resistance R, you can to select precision as 0.1% low resistance
Conventional resistance, without customized；And by calculating, the voltage on dielectric loss artifical resistance R is no more than 100V, meets low
The requirement of current potential work.
For the heating power on dielectric loss artifical resistance R, electric capacity shunting RC dielectric loss models of the present invention
Middle dielectric loss artifical resistance R heating power is 0.021W, and the power in conventional model is 0.31W, the heating in the present invention
Measure less than 10% be down in conventional model；Dielectric loss artifical resistance R need to select the electricity that power is more than 1W in conventional model
Resistance, and the dielectric loss artifical resistance R in the present invention in electric capacity shunting RC dielectric loss models is from the electricity that power is 1/4W
Resistance, the power consumption of resistor 6 substantially reduce, and eliminate resistor 6 because of the influence generated heat to resistance value and precision, and then avoid
Influence the stability and accuracy of measurement data.
As shown in table 1 below, 11 stepping subelements of the present embodiment realize 30 grades of dielectric dissipation factor standards, i.e., 0.000%
~10%, it is combined to realize a dielectric loss value gear mould using the resistor 6 of one or more stepping subelement
Intend, rather than using the corresponding resistor 6 of a dielectric loss value gear.
From table 1 it follows that it is combined to have obtained 30 grades of dielectric loss value using 11 resistors 6, from resistor 6
The volume and weight of dielectric dissipation factor standard is considerably reduced in quantity, the weight of dielectric dissipation factor standard is by original
10 kilograms come are down to 2 kilograms, and structure is compacter, performance is relatively reliable, intelligent, is more suitable for the live school of production line
Test.
Table 1：11 stepping subelements realize 30 dielectric loss value gear simulations
The present invention carries out gear shift operation by the way of remote control to dielectric loss factor standard, and support just connects, reversal connection test mode, school
The dielectric loss factor standard that operate not having to during testing back and forth is shifted gears, and operation only need to be remotely controlled by dedicated remote control,
The switching of gear can be completed, oncontacting risk when realizing dielectric loss standard gear switch, greatly reduces testing crew
Working strength, operating efficiency is improved, while reduce the number that testing crew enters high pressure fence, avoid testing crew by high pressure
The danger of electric injury.Practical application shows that the verification deadline of every dielectric loss instrument was reduced to about 0.5 hour from 3 hours, work
Efficiency improves 6 times, while in checking procedure, reduces to 2 times/platform, be substantially improved into the number of high pressure fence from 30 times/platform
Job security.
Above disclosed is only the embodiment of the present invention, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, can readily occur in change or modification, all
It should be included within the scope of the present invention.
Claims (7)
- A kind of 1. dielectric dissipation factor standard of high stability, it is characterised in that：Including high-voltage terminal（1）, standard capacitance Device（5）, step resistance unit（3）, CX terminals（2）, bridging condenser（4）, gear control and drive module, master control molding Block, wireless communication module, display module, power module and remote control；The standard capacitor（5）One end and high-voltage terminal （1）Be connected, the other end respectively with bridging condenser（4）One end and step resistance unit（3）The first terminals be connected Connect；The bridging condenser（4）The other end ground connection, step resistance unit（3）The second terminals and CX terminals（2）It is connected Connect；The step resistance unit（3）The 3rd terminals controlled with the gear and the output end of drive module is connected；It is described Gear control and drive module input, display module, power module and wireless communication module respectively with main control module It is connected；The power module is also connected with display module and wireless communication module respectively；The wireless communication module and institute State remote control and carry out radio communication.
- 2. dielectric dissipation factor standard as claimed in claim 1, it is characterised in that：The step resistance unit（3）Be by Resistor（6）And relay（7）Composition, the relay（7）Contact and the resistor（6）Compose in parallel stepping Unit, each stepping subelement are sequentially connected in series the step resistance unit（3）；The gear control and drive module are to master The signal that control module is sent is analyzed and handled, and it is single more than stepping that control stepping subelement carries out gear combination realization The dielectric loss value gear simulation of first number.
- 3. dielectric dissipation factor standard as claimed in claim 2, it is characterised in that：The step resistance unit（3）By 11 Individual stepping subelement is sequentially connected in series, and controls 11 stepping subelements to carry out gear group by gear control and drive module Close, realize 30 dielectric loss value gear simulations.
- 4. dielectric dissipation factor standard as claimed in claim 2, it is characterised in that：The stepping subelement carries out gear group After conjunction, the computing the resistor value expression formula of dielectric loss artifical resistance is：Wherein, k is diverting coefficient, and tan δ are Dielectric loss tangent value, and w is angular frequency, and C1 is standard capacitor（5）Electric capacity Amount, C2 is bridging condenser（4）Capacitance.
- 5. dielectric dissipation factor standard as claimed in claim 1, it is characterised in that：The step resistance unit（3） Three terminals are controlled by optocoupler with the gear and the output end of drive module is connected.
- 6. dielectric dissipation factor standard as claimed in claim 1, it is characterised in that：The standard capacitor（5）Using SF6 Standard capacitor（5）, capacitance 100PF, insulation against ground 50KV.
- 7. dielectric dissipation factor standard as claimed in claim 1, it is characterised in that：The power module be by lithium battery and The power circuit that charging circuit is formed, for providing electric energy for modules；The lithium battery is made up of multiple lithium batteries Lithium battery group, multiple lithium batteries are fixed by sectional shelf-unit, and multiple lithium batteries carry out serial or parallel connection company by nickel sheet Connect；Lithium electric protection plate is welded with the multiple lithium battery；The lithium battery group with lithium electric protection plate is fixedly mounted on battery In assembly housing, the battery-pack exterior casing is provided with charge port and discharge port, the output end of the charging circuit and the charge port It is connected, the discharge port is connected with the main control module.
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| CN201710687050.5A CN107621573A (en) | 2017-08-11 | 2017-08-11 | A kind of dielectric dissipation factor standard of high stability |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109581264A (en) * | 2019-01-08 | 2019-04-05 | 任守华 | A kind of capacitance and dielectric loss standard |
| CN112630542A (en) * | 2020-10-30 | 2021-04-09 | 国网宁夏电力有限公司 | Loss test method, medium and system of filter capacitor |
| CN114334450A (en) * | 2022-01-06 | 2022-04-12 | 北京东方计量测试研究所 | Loss standard device |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109581264A (en) * | 2019-01-08 | 2019-04-05 | 任守华 | A kind of capacitance and dielectric loss standard |
| CN112630542A (en) * | 2020-10-30 | 2021-04-09 | 国网宁夏电力有限公司 | Loss test method, medium and system of filter capacitor |
| CN112630542B (en) * | 2020-10-30 | 2022-05-20 | 国网宁夏电力有限公司 | Loss test method, medium and system for filter capacitor |
| CN114334450A (en) * | 2022-01-06 | 2022-04-12 | 北京东方计量测试研究所 | Loss standard device |
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Application publication date: 20180123 |