CN104360141B - Stand-off ratio voltage coefficient detection method based on separable direct current voltage divider - Google Patents
Stand-off ratio voltage coefficient detection method based on separable direct current voltage divider Download PDFInfo
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Abstract
The invention provides a stand-off ratio voltage coefficient detection method based on a separable direct current voltage divider. The method comprises the steps of 1, measuring the relative error of the voltage of a low-voltage arm resistor of a direct current voltage divider to be measured with a first auxiliary voltage divider as the reference standard; 2, measuring the relative error of the voltage of the low-voltage arm resistor of the direct current voltage divider to be measured with a second auxiliary voltage divider as the reference standard; 3, measuring the relative error of the voltage of the low-voltage arm resistor of the direct current voltage divider to be measured with a voltage divider subcircuit formed by series connection of the first auxiliary voltage divider and the second auxiliary voltage divider as the reference standard; 4, calculating the stand-off ratio voltage coefficient of the direct current voltage divider to be measured. Compared with the prior art, the method has the advantages that detection is easier and more convenient, a detection result is more accurate, and the influence of the difference in low-voltage arm resistors of auxiliary voltage dividers on calculation of the stand-off ratio voltage coefficient of the direct current voltage divider to be measured existing during a direct voltage addition test is avoided.
Description
Technical field
The present invention relates to a kind of DC partial voltage than voltage coefficient detection method and in particular to a kind of be based on separable DC
The intrinsic standoff ratio voltage coefficient detection method of potentiometer.
Background technology
Divider (DC voltage divider), is for power system and electric, electronic equipment manufacturing department
The equipment of measurement DC high voltage, its intrinsic standoff ratio is typically traceable on direct current standard voltage divider.The partial pressure of direct current standard voltage divider
The mensure of the voltage coefficient of intrinsic standoff ratio under the demarcation of resistance ratio and high voltage under low-voltage can be resolved into than magnitude tracing process.
DC voltage addition be a kind of under the real work voltage of divider, calculated straight according to test measurement result
The method of flow point pressure ratio voltage coefficient.When carrying out DC voltage addition test, auxiliary divider is used alone and goes here and there
Connection uses two kinds of working methods.In conventional DC voltage addition test, low when two auxiliary dividers are used in series
Low-voltage arm resistance value sum unequal when pressure arm resistance value is used alone with this two auxiliary dividers, is therefore pushing away
Lead the DC partial voltage of main divider than voltage coefficient computing formula when it is necessary to consider to make because of auxiliary divider series connection
The error being introduced with not waiting with low-voltage arm resistance value when being used alone, in the specific implementation process of DC voltage addition test
In, need the difference size of low-voltage arm resistance value when measuring when auxiliary-voltage divider is used in series and being used alone, and will survey
The difference size measuring is updated to DC partial voltage than in the computing formula of voltage coefficient.This not only makes DC partial voltage than voltage system
The computing formula of number becomes more complicated, and increased the implementation steps of DC voltage addition test.Simultaneously as measurement is auxiliary
The different difficulty of low-voltage arm resistance value difference when helping divider to be used in series and when being used alone is very big, is readily incorporated extra
Measurement error reduces the accuracy that DC partial voltage measures than voltage coefficient to DC partial voltage ratio in the result of calculation of voltage coefficient.
It is, therefore, desirable to provide one kind can simplify DC partial voltage implementing than voltage coefficient computing formula, minimizing DC voltage addition test
Step, the DC partial voltage of raising uncertainty of measurement level are than voltage coefficient detection method.
Content of the invention
In order to meet the needs of prior art, the invention provides a kind of intrinsic standoff ratio electricity based on separable DC potentiometer
Pressure coefficient detection method, described separable DC potentiometer includes the first auxiliary-voltage divider and the second auxiliary-voltage divider；Described side
Method includes：
Step 1：First auxiliary-voltage divider and divider to be measured apply DC voltage U simultaneously, with the first auxiliary
Potentiometer is reference standard, measures voltage relative error ε at the low-voltage arm resistance two ends of divider to be measureda(U)；
Step 2：Second auxiliary-voltage divider and divider to be measured apply DC voltage U simultaneously, with the second auxiliary
Potentiometer is reference standard, measures voltage relative error ε at the low-voltage arm resistance two ends of divider to be measuredb(U)；
Step 3：First auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider are formed potentiometer branch road；In described potentiometer
Apply DC voltage 2U, with described potentiometer branch road as reference standard, measurement is to be measured on branch road and divider to be measured simultaneously
Voltage relative error ε at the low-voltage arm resistance two ends of dividerc(2U)；
Step 4：Calculate described divider to be measured according to the voltage relative error that step 1- step 3 obtains from voltage U
To voltage 2U DC partial voltage than voltage coefficient γ (2U).
Preferably, low-voltage arm resistance R of described first auxiliary-voltage dividerl1Resistance and the second auxiliary-voltage divider low-voltage arm
Resistance Rl2Resistance identical, and described low-voltage arm resistance Rl1With low-voltage arm resistance Rl2It is the low of described divider to be measured
Pressure arm resistance Rl3Resistance half；
The high-voltage arm resistance R of described first auxiliary-voltage dividerh1Resistance and the second auxiliary-voltage divider high-voltage arm resistance Rh2
Resistance identical, and described high-voltage arm resistance Rh1With high-voltage arm resistance Rh2It is the high-voltage arm electricity of described divider to be measured
Resistance Rh3Resistance half；
Preferably, in described step 4, the computing formula than voltage coefficient γ (2U) for the DC partial voltage is：
γ (2U)=0.5 [εa(U)+εb(U)]-εc(2U) (1)；
Preferably, described separable DC potentiometer includes the high-voltage arm resistance R being provided with the first auxiliary-voltage dividerh1?
One insulating cylinder, is provided with the high-voltage arm resistance R of the second auxiliary-voltage dividerh2The second insulating cylinder, and be provided with the first auxiliary and divide
Low-voltage arm resistance R of depressorl1Low-voltage arm resistance R with the second auxiliary-voltage dividerl2Metal shielding box；
Described first insulating cylinder is the airtight pillar buoy being made up of metal cover board, metal chassis and insulating arthropleura；Described
High-voltage arm resistance Rh1One end lead lead to outside the first insulating cylinder by described metal cover board, other end lead pass through described
Metal chassis lead to outside the first insulating cylinder；The outside of described lead is provided with insulated sleeve to ensure lead and metal cover board,
And insulate with metal chassis, described insulated sleeve is sealed with lead, metal cover board and metal chassis to ensure that first is exhausted respectively
The sealing of edge cylinder；
Described second insulating cylinder is the airtight pillar buoy being made up of metal cover board, metal chassis and insulating arthropleura；Described
High-voltage arm resistance Rh2One end lead lead to outside the second insulating cylinder by described metal cover board, other end lead pass through described
Metal chassis lead to outside the second insulating cylinder；The outside of described lead is provided with insulated sleeve to ensure lead and metal cover board,
And insulate with metal chassis, described insulated sleeve is sealed with lead, metal cover board and metal chassis to ensure that second is exhausted respectively
The sealing of edge cylinder；
Described metal shielding box includes top cover and base；Described top cover is provided with the first lead terminal, the second lead terminal
With the 3rd lead terminal；Described base is provided with the first outlet terminal, the second outlet terminal, the 3rd outlet terminal and the 4th outlet
Terminal；
Described low-voltage arm resistance Rl1With low-voltage arm resistance Rl2Connected mode after series connection includes：
Low-voltage arm resistance Rl1One branch road of the other end is connected with described second lead terminal, another article of branch road and described the
Three lead terminals connect；Low-voltage arm resistance Rl2One branch road of the other end is connected with described second outlet terminal, another branch road
It is connected with described 3rd outlet terminal；Low-voltage arm resistance Rl1With low-voltage arm resistance Rl2One branch road and described first of junction point
Lead terminal connects, and a branch road is connected with described first outlet terminal, and one article of branch road is connected with described 4th outlet terminal；
Preferably, described first auxiliary-voltage divider, as reference standard, measures the low-voltage arm resistance of divider to be measured
Voltage relative error ε at two endsa(U) when：By the lead of the metal cover board side of described first insulating cylinder with external dc power even
Connect, the lead of described metal chassis side is connected with the second lead terminal of described metal shielding box, described first outlet terminal connects
Ground；
Described second auxiliary-voltage divider, as reference standard, measures the electricity at the low-voltage arm resistance two ends of divider to be measured
Pressure relative error εb(U) when：The lead of the metal cover board side of described second insulating cylinder is connected with external dc power, described gold
The lead belonging to chassis side is connected with the first lead terminal of described metal shielding box, described second outlet terminal ground connection；
The potentiometer branch road of described first auxiliary-voltage divider and the series connection formation of the second auxiliary-voltage divider, as reference standard, is surveyed
Measure voltage relative error ε at the low-voltage arm resistance two ends of divider to be measuredc(2U) when：Metal cover board by the first insulating cylinder
The lead of side is connected with external dc power, and the lead of the metal cover board side of the lead of metal chassis side and the second insulating cylinder is even
Connect, the lead of metal chassis side of the second insulating cylinder is connected with the second lead terminal of described metal shielding box, described second goes out
Line terminals are grounded；
Preferably, measure described low-voltage arm resistance Rl1The voltage at two ends includes：Gather described metal shielding box the 3rd draws
Magnitude of voltage between line terminals and the 4th outlet terminal；
Measure described low-voltage arm resistance Rl2The voltage at two ends includes：
Gather the magnitude of voltage between the 3rd outlet terminal of described metal shielding box and the 4th outlet terminal；
Measure described low-voltage arm resistance Rl1With low-voltage arm resistance Rl2After series connection, the voltage at two ends includes：
Gather the magnitude of voltage between the 3rd lead terminal of described metal shielding box and the 3rd outlet terminal.
Compared with immediate prior art, the excellent effect of the present invention is：
1st, in technical solution of the present invention, the auxiliary-voltage divider as reference standard in DC voltage addition test is designed as
High-voltage arm and low-voltage arm can be with detached dividers, high-voltage arm resistance when making two auxiliary-voltage divider be used in series and low
Pressure arm resistance is respectively equal to the high-voltage arm resistance sum and low-voltage arm resistance sum when this two auxiliary-voltage divider are used alone, from
And eliminate the error introducing because auxiliary-voltage divider low-voltage arm resistance is different, decrease test procedure, be conducive to improving to be measured
The DC partial voltage of divider is than the uncertainty of measurement level of voltage coefficient；
2nd, in technical solution of the present invention, the metal shielding box being provided with the low-voltage arm resistance of auxiliary-voltage divider is four port electricity
Resistance, eliminates the impact to low-voltage arm resistance of lead resistance and contact resistance during DC voltage addition test, is conducive to
Improve uncertainty of measurement level；
3rd, the intrinsic standoff ratio voltage coefficient detection method based on separable DC potentiometer that the present invention provides, its detecting step
Easier, testing result is more accurate, during eliminating DC voltage addition test, the difference of auxiliary-voltage divider low-voltage arm resistance
The impact that the DC partial voltage of divider to be measured is calculated than voltage coefficient.
Brief description
The present invention is further described below in conjunction with the accompanying drawings.
Fig. 1：A kind of intrinsic standoff ratio voltage coefficient detection method stream based on separable DC potentiometer in the embodiment of the present invention
Cheng Tu；
Fig. 2：Divider structure principle chart in the embodiment of the present invention；
Fig. 3：Insulating barrel structure schematic diagram in the embodiment of the present invention；
Fig. 4：Metal shielding box structural representation in the embodiment of the present invention；
Wherein, 1- insulating arthropleura；2- metal cover board；3- metal chassis；4- high-voltage arm resistance；5- insulated sleeve；6- metal
The lead of cover plate side；The lead of 7- metal chassis side；8- metal shielding box shell；The low-voltage arm electricity of 9- first auxiliary-voltage divider
Resistance；The low-voltage arm resistance of 10- second auxiliary-voltage divider；11- insulated sleeve；12- second lead terminal；13- second outlet terminal；
14- first lead terminal；15- first outlet terminal；16- the 3rd lead terminal；17- the 4th outlet terminal；18- the 3rd leading-out terminal
Son.
Specific embodiment
Embodiments of the invention are described below in detail, the example of described embodiment is shown in the drawings, wherein from start to finish
The element that same or similar label represents same or similar element or has same or like function.Below with reference to attached
The embodiment of figure description is exemplary it is intended to be used for explaining the present invention, and is not considered as limiting the invention.
First, intrinsic standoff ratio voltage coefficient；
Under different voltages, the intrinsic standoff ratio of divider is different, and intrinsic standoff ratio voltage coefficient illustrates under different voltages
Intrinsic standoff ratio relative variation.
2nd, DC voltage addition test；
1st, DC voltage addition test needs to divide using three direct currents as the method that predominantly detects of intrinsic standoff ratio voltage coefficient
Depressor：
Divider 1# and divider 2# is auxiliary-voltage divider, potentiometer based on divider 3#, and direct current divides
The rated voltage of depressor 1# and 2# is the half of divider 3#.When divider 1# is used alone, high-voltage arm resistance is
R1, low-voltage arm resistance is R2；When divider 2# is used alone, high-voltage arm resistance is R3+R'4, low-voltage arm resistance is R4；Will be straight
Flow point depressor 1# and 2# is together in series when forming series voltage divider use, and high-voltage arm resistance is R1+R2+R3, low-voltage arm resistance is
R'4+R4；The high-voltage arm resistance of divider 3# is R5, low-voltage arm resistance is R6.Wherein, R1=R3=R5/2、R2=R'4=R4
=R6/2.
2nd, the step of DC voltage addition test includes：
(1) identical DC high voltage U is applied on divider 1# and 3#, be with reference to mark with divider 1#
Standard, measures R2And R6The relative error of upper voltage, is designated as α1(U)；
(2) identical DC high voltage U is applied on divider 2# and 3#, be with reference to mark with divider 2#
Standard, measures R4And R6The relative error of upper voltage, is designated as α2(U)；
(3) apply identical DC high voltage 2U on series voltage divider and divider 3#, with series voltage divider be
Reference standard, measures R'4+R4And R6The relative error of upper voltage, is designated as α3(2U)；
(4) at lower voltages, with R2For reference standard, measure R2And R'4The relative error of resistance, is designated as α4；
(5) according to definition, divider 3# from intrinsic standoff ratio voltage coefficient γ (2U) of voltage U to voltage 2U is：
γ (2U)=[K (2U)-K (U)]/K0(1)
Wherein：K (2U) is actual intrinsic standoff ratio under voltage 2U for the divider 3#；K (U) is divider 3# in electricity
Actual intrinsic standoff ratio under pressure U；K0Nominal partial pressure ratio for divider 3#.
Calculate intrinsic standoff ratio voltage coefficient γ (2U) from voltage U to voltage 2U for the divider 3# formula be：
γ (2U)=0.5 [α1(U)+α2(U)]-α3(2U)-0.5α4'(U) (2)
Wherein：α4' (U) be that divider 1# and 2# is independently operated under DC high voltage U, with R2During for reference standard
R2And R'4The relative error of resistance.
Due to direct measurement α under high voltage U4' (U) difficulty is larger, implements relatively difficult, therefore with low-voltage
Measured value α4Approximate replacement α4' (U), then have：
γ(2U)≈0.5[α1(U)+α2(U)]-α3(2U)-0.5α4(3)
The test data obtaining will be measured and substitute into formula (3) in step (1)-step (4), γ (2U) can be calculated,
Thus obtain divider 3# from voltage U the voltage coefficient to the DC partial voltage of voltage 2U ratio.
When divider 1# and 2# is operated in high voltage U, resistance heating is serious, and the temperature within dielectric chamber raises,
Lead to R2And R'4Resistance change, due to R2And R'4Temperature curve can not possibly identical, R2And R'4Change in resistance
Amount is different, therefore R2And R'4Relative error α of resistance4' (U) be not a steady state value, its size and divider work
The size making voltage U is relevant.Measure α at lower voltages4When, resistance heating amount is minimum, temperature-resistant within dielectric chamber, with
Ambient temperature is identical, the α recording4It is a steady state value.Obviously, divider is operated in α during high voltage U4' (U) with low
The α obtaining is measured under voltage4It is different, therefore when calculating DC partial voltage than voltage coefficient, use α4Approximate replacement α4' (U) meeting
Introduce error.
Therefore, using conventional DC voltage addition, the DC partial voltage being derived by must than the computing formula of voltage coefficient
R must be considered2And R'4The impact to result of calculation for the difference, in being embodied as of DC voltage addition test, need in low electricity
Pressure measurement R2And R'4Relative error α of resistance4, increased test procedure, and by α4Measurement result substitute into formula carry out
The DC partial voltage of divider 3#, than the calculating of voltage coefficient, also can introduce error, reduces the level of uncertainty of measurement.
3rd, it is the drawbacks described above overcoming prior art, the invention provides a kind of dividing based on separable DC potentiometer
Pressure ratio voltage coefficient detection method, separable DC potentiometer includes the first auxiliary-voltage divider and the second auxiliary-voltage divider；As Fig. 1
Shown concrete steps include：
1st, apply DC voltage U in the first auxiliary-voltage divider and divider to be measured, with the first auxiliary-voltage divider be
Reference standard, measures voltage relative error ε at the low-voltage arm resistance two ends of divider to be measureda(U).
2nd, apply DC voltage U in the second auxiliary-voltage divider and divider to be measured, with the second auxiliary-voltage divider be
Reference standard, measures voltage relative error ε at the low-voltage arm resistance two ends of divider to be measuredb(U).
3rd, the first auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider are formed potentiometer branch road；In potentiometer branch road and treating
Survey and apply DC voltage 2U on divider, with potentiometer branch road as reference standard, measure the low pressure of divider to be measured
Voltage relative error ε at arm resistance two endsc(2U).
4th, calculate described divider to be measured from voltage U to voltage 2U according to the voltage relative error that step 1-3 obtains
DC partial voltage than voltage coefficient γ (2U), computing formula is：
γ (2U)=0.5 [εa(U)+εb(U)]-εc(2U) (4)
Wherein, low-voltage arm resistance R of the first auxiliary-voltage dividerl1Resistance and the second auxiliary-voltage divider low-voltage arm resistance
Rl2Resistance identical, and low-voltage arm resistance Rl1With low-voltage arm resistance Rl2It is low-voltage arm resistance R of divider to be measuredl3's
Resistance half；The high-voltage arm resistance R of the first auxiliary-voltage dividerh1Resistance and the second auxiliary-voltage divider high-voltage arm resistance Rh2's
Resistance is identical, and high-voltage arm resistance Rh1With high-voltage arm resistance Rh2It is the high-voltage arm resistance R of divider to be measuredh3Resistance
Half.
4th, in the present embodiment, the concrete structure of separable DC potentiometer is：
1st, it is provided with the high-voltage arm resistance R of the first auxiliary-voltage dividerh1The first insulating cylinder, be provided with the second auxiliary-voltage divider
High-voltage arm resistance Rh2The second insulating cylinder；
(1) first insulating cylinder includes the airtight pillar buoy being made up of metal cover board, metal chassis and insulating arthropleura；
High-voltage arm resistance Rh1One end lead lead to outside the first insulating cylinder by metal cover board, other end lead passes through
Metal chassis lead to outside the first insulating cylinder；The outside of lead is provided with insulated sleeve ensureing lead and metal cover board, and
Lead is insulated with metal chassis, and insulated sleeve is sealed with lead, metal cover board and metal chassis to ensure the first insulating cylinder respectively
Sealing.
(3) second insulating cylinders also include the airtight pillar buoy being made up of metal cover board, metal chassis and insulating arthropleura；High
Pressure arm resistance Rh2One end lead lead to outside the second insulating cylinder by metal cover board, other end lead is drawn by metal chassis
Go out to the second insulating cylinder；The outside of lead is provided with insulated sleeve ensureing lead and metal cover board, and lead and metal
Insulate in chassis, insulated sleeve is sealed with lead, metal cover board and metal chassis to ensure the sealing of the second insulating cylinder respectively；
The structure of (3) first insulating cylinders and the second insulating cylinder is identical, and the structural representation of insulating cylinder is as shown in Figure 3.
2nd, it is provided with low-voltage arm resistance R of the first auxiliary-voltage dividerl1Low-voltage arm resistance R with the second auxiliary-voltage dividerl2Gold
Belong to shielding box；
As shown in figure 4, metal shielding box includes top cover and base；Top cover is provided with the first lead terminal 14, the second lead
Terminal 12 and the 3rd lead terminal 16；Base is provided with the first outlet terminal 15, the second outlet terminal 13, the 3rd outlet terminal 18
With the 4th outlet terminal 17；
Low-voltage arm resistance Rl1With low-voltage arm resistance Rl2Connected mode after series connection is：
Low-voltage arm resistance Rl1One branch road of the other end is connected with the second lead terminal 12, another article of branch road and the 3rd lead
Terminal 16 connects；Low-voltage arm resistance Rl2One branch road of the other end is connected with the second outlet terminal 13, another article of branch road and the 3rd
Outlet terminal 18 connects；Low-voltage arm resistance Rl1With low-voltage arm resistance Rl2One branch road of junction point and the first lead terminal 14 are even
Connect, a branch road is connected with the first outlet terminal 15, and one article of branch road is connected with the 4th outlet terminal 17.
3rd, when carrying out the operation of step 1：
Apply DC voltage U, using the first auxiliary-voltage divider as reference standard, measure the low-voltage arm of divider to be measured
Voltage relative error ε at resistance two endsa(U), the lead of the metal cover board side of the first insulating cylinder is connected with external dc power,
The lead of metal chassis side is connected with the second lead terminal of metal shielding box, the first outlet terminal ground connection.
The structural principle of described first auxiliary-voltage divider is as shown in Figure 2.
When carrying out the operation of step 2：
Apply DC voltage U, using the second auxiliary-voltage divider as reference standard, measure the low-voltage arm of divider to be measured
Voltage relative error ε at resistance two endsb(U), the lead of the metal cover board side of the second insulating cylinder is connected with external dc power,
The lead of metal chassis side is connected with the first lead terminal of metal shielding box, the second outlet terminal ground connection.
The structural principle of described second auxiliary-voltage divider is as shown in Figure 2.
When carrying out the operation of step 3：
Apply DC voltage 2U, made with the potentiometer branch road that the first auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider are formed
For reference standard, measure voltage relative error ε at the low-voltage arm resistance two ends of divider to be measuredc(2U), first is insulated
The lead of the metal cover board side of cylinder is connected with external dc power, the metal cover board of the lead of metal chassis side and the second insulating cylinder
The lead of side connects, and the lead of metal chassis side of the second insulating cylinder is connected with the second lead terminal of metal shielding box, and second
Outlet terminal is grounded.
The structural principle of described potentiometer branch road is as shown in Figure 2.
4th, resistance R in the structural principle of divider to be measured such as Fig. 2l3And Rh3Shown in series arm.
5th, measure low-voltage arm resistance Rl1The voltage at two ends includes：3rd lead terminal and the 4th of collection metal shielding box goes out
Magnitude of voltage between line terminals.
Measurement low-voltage arm resistance Rl2The voltage at two ends includes：3rd outlet terminal of collection metal shielding box and the 4th outlet
Magnitude of voltage between terminal.
Measurement low-voltage arm resistance Rl1With low-voltage arm resistance Rl2After series connection, the voltage at two ends includes：Collection metal shielding box
Magnitude of voltage between 3rd lead terminal and the 3rd outlet terminal.
6th, all lead terminals of metal shielding box and outlet terminal are equipped with insulated sleeve 11 to ensure terminal and metal
Shielding box insulate, and insulated sleeve 11 is sealed with terminal and metal shielding box shell 8 to ensure the sealing of metal shielding box.
Finally it should be noted that：Described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained under the premise of not making creative work
Every other embodiment, broadly fall into the application protection scope.
Claims (5)
1. a kind of intrinsic standoff ratio voltage coefficient detection method based on separable DC potentiometer is it is characterised in that described separable
Divider includes the first auxiliary-voltage divider and the second auxiliary-voltage divider；Described first auxiliary-voltage divider includes high-voltage arm resistance
Rh1With low-voltage arm resistance Rl1, described second auxiliary-voltage divider includes high-voltage arm resistance Rh2With low-voltage arm resistance Rl2, direct current to be measured divides
Depressor includes high-voltage arm resistance Rh3With low-voltage arm resistance Rl3；Methods described includes：
Step 1：First auxiliary-voltage divider and divider to be measured apply DC voltage U simultaneously, with the first auxiliary partial pressure
Device is reference standard, measures low-voltage arm resistance R of divider to be measuredl3Voltage relative error ε at two endsa(U)；
Step 2：Second auxiliary-voltage divider and divider to be measured apply DC voltage U simultaneously, with the second auxiliary partial pressure
Device is reference standard, measures low-voltage arm resistance R of divider to be measuredl3Voltage relative error ε at two endsb(U)；
Step 3：First auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider are formed potentiometer branch road；In described potentiometer branch road
With DC voltage 2U is applied on divider to be measured simultaneously, with described potentiometer branch road as reference standard, measure direct current to be measured
Low-voltage arm resistance R of potentiometerl3Voltage relative error ε at two endsc(2U)；
Step 4：Calculate described divider to be measured according to the voltage relative error that step 1- step 3 obtains from voltage U to electricity
The DC partial voltage of pressure 2U is than voltage coefficient γ (2U)；
Described separable DC potentiometer includes the high-voltage arm resistance R being provided with the first auxiliary-voltage dividerh1The first insulating cylinder, if
It is equipped with the high-voltage arm resistance R of the second auxiliary-voltage dividerh2The second insulating cylinder, and the low-voltage arm being provided with the first auxiliary-voltage divider
Resistance Rl1Low-voltage arm resistance R with the second auxiliary-voltage dividerl2Metal shielding box；
Described first insulating cylinder is the airtight pillar buoy being made up of metal cover board, metal chassis and insulating arthropleura；Described high pressure
Arm resistance Rh1One end lead lead to outside the first insulating cylinder by described metal cover board, other end lead pass through described metal
Chassis leads to outside the first insulating cylinder；The outside of described lead is provided with insulated sleeve ensureing lead and metal cover board, and
Insulate with metal chassis, described insulated sleeve is sealed with lead, metal cover board and metal chassis to ensure the first insulating cylinder respectively
Sealing；
Described second insulating cylinder is the airtight pillar buoy being made up of metal cover board, metal chassis and insulating arthropleura；Described high pressure
Arm resistance Rh2One end lead lead to outside the second insulating cylinder by described metal cover board, other end lead pass through described metal
Chassis leads to outside the second insulating cylinder；The outside of described lead is provided with insulated sleeve ensureing lead and metal cover board, and
Insulate with metal chassis, described insulated sleeve is sealed with lead, metal cover board and metal chassis to ensure the second insulating cylinder respectively
Sealing；
Described metal shielding box includes top cover and base；Described top cover is provided with the first lead terminal, the second lead terminal and
Three lead terminals；Described base is provided with the first outlet terminal, the second outlet terminal, the 3rd outlet terminal and the 4th leading-out terminal
Son；
Described low-voltage arm resistance Rl1With low-voltage arm resistance Rl2Connected mode after series connection includes：
Low-voltage arm resistance Rl1One branch road of the other end is connected with described second lead terminal, and another article of branch road draws with the described 3rd
Line terminals connect；Low-voltage arm resistance Rl2One branch road of the other end is connected with described second outlet terminal, another branch road and institute
State the 3rd outlet terminal to connect；Low-voltage arm resistance Rl1With low-voltage arm resistance Rl2One branch road of junction point and described first lead
Terminal connects, and a branch road is connected with described first outlet terminal, and one article of branch road is connected with described 4th outlet terminal.
2. the method for claim 1 is it is characterised in that low-voltage arm resistance R of described first auxiliary-voltage dividerl1Resistance
Low-voltage arm resistance R with the second auxiliary-voltage dividerl2Resistance identical, and described low-voltage arm resistance Rl1With low-voltage arm resistance Rl2All
Low-voltage arm resistance R for described divider to be measuredl3Resistance half；
The high-voltage arm resistance R of described first auxiliary-voltage dividerh1Resistance and the second auxiliary-voltage divider high-voltage arm resistance Rh2Resistance
Value is identical, and described high-voltage arm resistance Rh1With high-voltage arm resistance Rh2It is the high-voltage arm resistance R of described divider to be measuredh3
Resistance half.
3. the method for claim 1 is it is characterised in that DC partial voltage is than voltage coefficient γ's (2U) in described step 4
Computing formula is：
γ (2U)=0.5 [εa(U)+εb(U)]-εc(2U) (1).
4. the method for claim 1 it is characterised in that described first auxiliary-voltage divider is as reference standard, treat by measurement
Survey low-voltage arm resistance R of dividerl3Voltage relative error ε at two endsa(U) when：Crown cap by described first insulating cylinder
The lead of plate side is connected with external dc power, the lead of described metal chassis side and the second lead end of described metal shielding box
Son connects, described first outlet terminal ground connection；
Described second auxiliary-voltage divider, as reference standard, measures low-voltage arm resistance R of divider to be measuredl3The voltage at two ends
Relative error εb(U) when：The lead of the metal cover board side of described second insulating cylinder is connected with external dc power, described metal
The lead of chassis side is connected with the first lead terminal of described metal shielding box, described second outlet terminal ground connection；
The potentiometer branch road of described first auxiliary-voltage divider and the series connection formation of the second auxiliary-voltage divider as reference standard, treat by measurement
Survey low-voltage arm resistance R of dividerl3Voltage relative error ε at two endsc(2U) when：Metal cover board side by the first insulating cylinder
Lead be connected with external dc power, the lead of metal chassis side is connected with the lead of the metal cover board side of the second insulating cylinder,
The lead of metal chassis side of the second insulating cylinder is connected with the second lead terminal of described metal shielding box, described second leading-out terminal
Son ground connection.
5. the method for claim 1 is it is characterised in that measure described low-voltage arm resistance Rl1The voltage at two ends includes：Adopt
Collect the magnitude of voltage between the 3rd lead terminal of described metal shielding box and the 4th outlet terminal；
Measure described low-voltage arm resistance Rl2The voltage at two ends includes：
Gather the magnitude of voltage between the 3rd outlet terminal of described metal shielding box and the 4th outlet terminal；
Measure described low-voltage arm resistance Rl1With low-voltage arm resistance Rl2After series connection, the voltage at two ends includes：
Gather the magnitude of voltage between the 3rd lead terminal of described metal shielding box and the 3rd outlet terminal.
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| CN106556745B (en) * | 2015-09-25 | 2020-01-17 | 中国电力科学研究院 | Direct current voltage divider and capacitance and dielectric loss detection method thereof |
| CN107490713B (en) * | 2016-06-12 | 2020-06-09 | 中芯国际集成电路制造(上海)有限公司 | Detection circuit and detection method of voltage generation unit |
| CN106680561B (en) * | 2016-11-18 | 2023-08-15 | 国家电网公司 | Double-air-chamber direct-current voltage divider |
| CN106546790A (en) * | 2016-11-25 | 2017-03-29 | 云南电网有限责任公司电力科学研究院 | A kind of differential configuration resitstance voltage divider |
| CN109270319A (en) * | 2018-11-29 | 2019-01-25 | 西安高研电器有限责任公司 | A kind of multi-tap voltage transformer and its production, adjustment method |
| CN113608011B (en) * | 2021-08-11 | 2024-01-30 | 国网江苏省电力有限公司 | Direct-current high-voltage measuring device with self-calibration function and operation method thereof |
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