CN104360141A - 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 the detection method of a kind of DC partial voltage than voltage coefficient, be specifically related to a kind of intrinsic standoff ratio voltage coefficient detection method based on separable DC voltage divider.
Background technology
Divider (DC voltage divider) is that its intrinsic standoff ratio is generally traceable on direct current standard voltage divider for electric system and electric, that DC high voltage is measured by electronic equipment manufacturing department equipment.The intrinsic standoff ratio magnitude tracing process of direct current standard voltage divider can resolve into the mensuration of the voltage coefficient of intrinsic standoff ratio under the demarcation of resistance ratio under low-voltage and high voltage.
DC voltage addition is a kind of under the real work voltage of divider, calculates the method for DC partial voltage than voltage coefficient according to test measurement result.When carrying out DC voltage addition test, auxiliary divider is used alone and connects use two kinds of working methods.In conventional DC voltage addition test, low-voltage arm resistance value sum when low-voltage arm resistance value when two auxiliary divider series connection use and this two auxiliary dividers are used alone is also unequal, therefore when the computing formula of the DC partial voltage of main divider of deriving than voltage coefficient, must consider because of the error that low-voltage arm resistance value when the series connection of auxiliary divider uses and is used alone etc. is not introduced, in the specific implementation process of DC voltage addition test, need the difference size of the low-voltage arm resistance value measured when auxiliary-voltage divider series connection uses and when being used alone, and be updated to DC partial voltage than in the computing formula of voltage coefficient by measuring the difference size obtained.This not only makes DC partial voltage become more complicated than the computing formula of voltage coefficient, and adds the implementation step of DC voltage addition test.Simultaneously, very large owing to measuring difficulty different with low-voltage arm resistance value difference when being used alone when the series connection of auxiliary divider uses, the extra measuring error of easy introducing than in the result of calculation of voltage coefficient, reduces the accuracy that DC partial voltage is measured than voltage coefficient to DC partial voltage.Therefore, need to propose a kind of DC partial voltage of DC partial voltage than voltage coefficient computing formula, minimizing DC voltage addition test implementation step, raising uncertainty of measurement level that can simplify than voltage coefficient detection method.
Summary of the invention
In order to meet the needs of prior art, the invention provides a kind of intrinsic standoff ratio voltage coefficient detection method based on separable DC voltage divider, described separable DC voltage divider comprises the first auxiliary-voltage divider and the second auxiliary-voltage divider; Described method comprises:
Step 1: simultaneously apply DC voltage U in the first auxiliary-voltage divider and divider to be measured, with the first auxiliary-voltage divider for normative reference, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
a(U);
Step 2: simultaneously apply DC voltage U in the second auxiliary-voltage divider and divider to be measured, with the second auxiliary-voltage divider for normative reference, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
b(U);
Step 3: the first auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider are formed voltage divider branch road; Described voltage divider branch road and divider to be measured apply DC voltage 2U simultaneously, with described voltage divider branch road for normative reference, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
c(2U);
Step 4: the voltage relative error obtained according to step 1-step 3 calculates described divider to be measured from voltage U to the DC partial voltage of voltage 2U than voltage coefficient γ (2U).
Preferably, the low-voltage arm resistance R of described first auxiliary-voltage divider
l1resistance and the low-voltage arm resistance R of the second auxiliary-voltage divider
l2resistance identical, and described low-voltage arm resistance R
l1with low-voltage arm resistance R
l2be the low-voltage arm resistance R of described divider to be measured
l3resistance half;
The high-voltage arm resistance R of described first auxiliary-voltage divider
h1resistance and the high-voltage arm resistance R of the second auxiliary-voltage divider
h2resistance identical, and described high-voltage arm resistance R
h1with high-voltage arm resistance R
h2be the high-voltage arm resistance R of described divider to be measured
h3resistance half;
Preferably, in described step 4, DC partial voltage than the computing formula of voltage coefficient γ (2U) is:
γ(2U)＝0.5[ε
a(U)+ε
b(U)]-ε
c(2U) (1)；
Preferably, described separable DC voltage divider comprises the high-voltage arm resistance R being provided with the first auxiliary-voltage divider
h1the first insulating cylinder, be provided with the high-voltage arm resistance R of the second auxiliary-voltage divider
h2the second insulating cylinder, and be provided with the low-voltage arm resistance R of the first auxiliary-voltage divider
l1with the low-voltage arm resistance R of the second auxiliary-voltage divider
l2metal shielding box;
Described first insulating cylinder is the airtight pillar buoy be made up of metal cover board, metal chassis and insulating arthropleura; Described high-voltage arm resistance R
h1one end lead-in wire lead to outside the first insulating cylinder by described metal cover board, the other end lead-in wire lead to outside the first insulating cylinder by described metal chassis; The outside of described lead-in wire is provided with insulating sleeve to ensure lead-in wire and metal cover board, and insulate with metal chassis, and described insulating sleeve seals the sealing to ensure the first insulating cylinder with lead-in wire, metal cover board and metal chassis respectively;
Described second insulating cylinder is the airtight pillar buoy be made up of metal cover board, metal chassis and insulating arthropleura; Described high-voltage arm resistance R
h2one end lead-in wire lead to outside the second insulating cylinder by described metal cover board, the other end lead-in wire lead to outside the second insulating cylinder by described metal chassis; The outside of described lead-in wire is provided with insulating sleeve to ensure lead-in wire and metal cover board, and insulate with metal chassis, and described insulating sleeve seals the sealing to ensure the second insulating cylinder with lead-in wire, metal cover board and metal chassis respectively;
Described metal shielding box comprises top cover and base; Described top cover is provided with the first lead terminal, the second lead terminal and 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 R
l1with low-voltage arm resistance R
l2connected mode after series connection comprises:
Low-voltage arm resistance R
l1a branch road of the other end is connected with described second lead terminal, and another article of branch road is connected with described 3rd lead terminal; Low-voltage arm resistance R
l2a branch road of the other end is connected with described second outlet terminal, and another article of branch road is connected with described 3rd outlet terminal; Low-voltage arm resistance R
l1with low-voltage arm resistance R
l2a branch road of tie point is connected with described first lead terminal, 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 with reference to standard, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
a(U) time: be connected with external dc power by the lead-in wire of the metal cover board side of described first insulating cylinder, the lead-in wire of described metal chassis side is connected with the second lead terminal of described metal shielding box, described first outlet terminal ground connection;
Described second auxiliary-voltage divider, as with reference to standard, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
b(U) time: be connected with external dc power by the lead-in wire of the metal cover board side of described second insulating cylinder, the lead-in wire of described metal chassis side is connected with the first lead terminal of described metal shielding box, described second outlet terminal ground connection;
The voltage divider branch road that described first auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider are formed, as with reference to standard, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
c(2U) time: the lead-in wire of the metal cover board side of the first insulating cylinder is connected with external dc power, the lead-in wire of metal chassis side is connected with the lead-in wire of the metal cover board side of the second insulating cylinder, the lead-in wire of the metal chassis side of the second insulating cylinder is connected with the second lead terminal of described metal shielding box, described second outlet terminal ground connection;
Preferably, described low-voltage arm resistance R is measured
l1the voltage at two ends comprises: gather 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 R
l2the voltage at two ends comprises:
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 R
l1with low-voltage arm resistance R
l2after series connection, the voltage at two ends comprises:
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, excellent effect of the present invention is:
1, in technical solution of the present invention, using in DC voltage addition test as the divider being designed to high-voltage arm with reference to the auxiliary-voltage divider of standard and can being separated with low-voltage arm, high-voltage arm resistance when the series connection of two auxiliary-voltage divider is used and low-voltage arm resistance equal high-voltage arm resistance sum when these two auxiliary-voltage divider are used alone and low-voltage arm resistance sum respectively, thus eliminate the error introduced because auxiliary-voltage divider low-voltage arm resistance is different, decrease test procedure, be conducive to improving the uncertainty of measurement level of DC partial voltage than voltage coefficient of divider to be measured,
2, 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 resistive, eliminate lead resistance in DC voltage addition test process and contact resistance to the impact of low-voltage arm resistance, be conducive to improving uncertainty of measurement level;
3, the intrinsic standoff ratio voltage coefficient detection method based on separable DC voltage divider provided by the invention, its detecting step is easier, testing result is more accurate, eliminate in DC voltage addition test process, the impact that the difference of auxiliary-voltage divider low-voltage arm resistance calculates than voltage coefficient the DC partial voltage of divider to be measured.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1: a kind of intrinsic standoff ratio voltage coefficient detection method process flow diagram based on separable DC voltage divider in the embodiment of the present invention;
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-insulating sleeve; The lead-in wire of 6-metal cover board side; The lead-in wire of 7-metal chassis side; 8-metal shielding box shell; The low-voltage arm resistance of 9-first auxiliary-voltage divider; The low-voltage arm resistance of 10-second auxiliary-voltage divider; 11-insulating 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 outlet terminal.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
One, intrinsic standoff ratio voltage coefficient;
Under different voltage, the intrinsic standoff ratio of divider is different, and intrinsic standoff ratio voltage coefficient illustrates the relative variation of the intrinsic standoff ratio under different voltage.
Two, DC voltage addition test;
1, DC voltage addition test needs use three dividers as the main detection method of intrinsic standoff ratio voltage coefficient:
Divider 1# and divider 2# is auxiliary-voltage divider, and divider 3# is main voltage divider, and the rated voltage of divider 1# and 2# is the half of divider 3#.When divider 1# is used alone, high-voltage arm resistance is R
1, low-voltage arm resistance is R
2; When divider 2# is used alone, high-voltage arm resistance is R
3+ R'
4, low-voltage arm resistance is R
4; When the composition series voltage divider that is together in series by divider 1# and 2# uses, high-voltage arm resistance is R
1+ R
2+ R
3, low-voltage arm resistance is R'
4+ R
4; The high-voltage arm resistance of divider 3# is R
5, low-voltage arm resistance is R
6.Wherein, R
1=R
3=R
5/ 2, R
2=R'
4=R
4=R
6/ 2.
2, the step of DC voltage addition test comprises:
(1) on divider 1# and 3#, apply identical DC high voltage U, with divider 1# for normative reference, measure R
2and R
6the relative error of upper voltage, is designated as α
1(U);
(2) on divider 2# and 3#, apply identical DC high voltage U, with divider 2# for normative reference, measure R
4and R
6the relative error of upper voltage, is designated as α
2(U);
(3) on series voltage divider and divider 3#, applying identical DC high voltage 2U, take series voltage divider as normative reference, measures R'
4+ R
4and R
6the relative error of upper voltage, is designated as α
3(2U);
(4) at lower voltages, with R
2for normative reference, measure R
2and R'
4the relative error of resistance, is designated as α
4;
(5) according to definition, the intrinsic standoff ratio voltage coefficient γ (2U) of divider 3# from voltage U to voltage 2U is:
γ(2U)＝[K(2U)-K(U)]/K
0(1)
Wherein: K (2U) is the actual intrinsic standoff ratio of divider 3# under voltage 2U; K (U) is the actual intrinsic standoff ratio of divider 3# under voltage U; K
0for the nominal partial pressure ratio of divider 3#.
The formula calculating the intrinsic standoff ratio voltage coefficient γ (2U) of divider 3# from voltage U to voltage 2U is:
γ(2U)＝0.5[α
1(U)+α
2(U)]-α
3(2U)-0.5α
4'(U) (2)
Wherein: α
4' (U) be under divider 1# and 2# is independently operated on DC high voltage U, with R
2for R during normative reference
2and R'
4the relative error of resistance.
Owing to directly measuring α under high voltage U
4' (U) difficulty is comparatively large, implements more difficult, therefore with the measured value α under low-voltage
4approximate replacement α
4' (U), then have:
γ(2U)≈0.5[α
1(U)+α
2(U)]-α
3(2U)-0.5α
4(3)
The test figure obtained will be measured 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 of dielectric chamber inside raises, and causes R
2and R'
4resistance change, due to R
2and R'
4temperature curve can not be identical, R
2and R'
4change in resistance amount be different, therefore R
2and R'
4the relative error α of resistance
4' (U) be not a steady state value, its size is relevant with the size of divider operating voltage U.Measure α at lower voltages
4time, resistance heating amount is minimum, dielectric chamber inside temperature-resistant, identical with environment temperature, the α recorded
4it is a steady state value.Obviously, α when divider is operated in high voltage U
4' (U) with measure the α obtained at lower voltages
4being different, therefore when calculating DC partial voltage than voltage coefficient, using α
4approximate replacement α
4' (U) can introduce error.
Therefore, adopt conventional DC voltage addition, the DC partial voltage obtained of deriving must consider R than the computing formula of voltage coefficient
2and R'
4difference on the impact of result of calculation, in the concrete enforcement of DC voltage addition test, need to measure R at lower voltages
2and R'
4the relative error α of resistance
4, add test procedure, and by α
4measurement result substitute into formula and carry out the calculating of DC partial voltage than voltage coefficient of divider 3#, also can introduce error, reduce the level of uncertainty of measurement.
Three, for overcoming the above-mentioned defect of prior art, the invention provides a kind of intrinsic standoff ratio voltage coefficient detection method based on separable DC voltage divider, separable DC voltage divider comprises the first auxiliary-voltage divider and the second auxiliary-voltage divider; Concrete steps comprise as shown in Figure 1:
1, in the first auxiliary-voltage divider and divider to be measured, apply DC voltage U, with the first auxiliary-voltage divider for normative reference, measure the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
a(U).
2, in the second auxiliary-voltage divider and divider to be measured, apply DC voltage U, with the second auxiliary-voltage divider for normative reference, measure the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
b(U).
3, the first auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider are formed voltage divider branch road; Voltage divider branch road and divider to be measured apply DC voltage 2U, with voltage divider branch road for normative reference, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
c(2U).
4, the voltage relative error obtained according to step 1-3 calculates described divider to be measured from voltage U to the DC partial voltage of voltage 2U than voltage coefficient γ (2U), and computing formula is:
γ(2U)＝0.5[ε
a(U)+ε
b(U)]-ε
c(2U) (4)
Wherein, the low-voltage arm resistance R of the first auxiliary-voltage divider
l1resistance and the low-voltage arm resistance R of the second auxiliary-voltage divider
l2resistance identical, and low-voltage arm resistance R
l1with low-voltage arm resistance R
l2be the low-voltage arm resistance R of divider to be measured
l3resistance half; The high-voltage arm resistance R of the first auxiliary-voltage divider
h1resistance and the high-voltage arm resistance R of the second auxiliary-voltage divider
h2resistance identical, and high-voltage arm resistance R
h1with high-voltage arm resistance R
h2be the high-voltage arm resistance R of divider to be measured
h3resistance half.
Four, in the present embodiment, the concrete structure of separable DC voltage divider is:
1, the high-voltage arm resistance R of the first auxiliary-voltage divider is provided with
h1the first insulating cylinder, be provided with the high-voltage arm resistance R of the second auxiliary-voltage divider
h2the second insulating cylinder;
(1) first insulating cylinder comprises the airtight pillar buoy be made up of metal cover board, metal chassis and insulating arthropleura;
High-voltage arm resistance R
h1one end lead-in wire lead to outside the first insulating cylinder by metal cover board, the other end lead-in wire lead to outside the first insulating cylinder by metal chassis; The outside of lead-in wire is provided with insulating sleeve to ensure lead-in wire and metal cover board, and lead-in wire and metal chassis insulate, insulating sleeve respectively with go between, metal cover board and metal chassis seal sealing to ensure the first insulating cylinder.
(3) second insulating cylinders also comprise the airtight pillar buoy be made up of metal cover board, metal chassis and insulating arthropleura; High-voltage arm resistance R
h2one end lead-in wire lead to outside the second insulating cylinder by metal cover board, the other end lead-in wire lead to outside the second insulating cylinder by metal chassis; The outside of lead-in wire is provided with insulating sleeve to ensure lead-in wire and metal cover board, and lead-in wire and metal chassis insulate, insulating sleeve respectively with go between, metal cover board and metal chassis seal sealing to ensure the second insulating cylinder;
(3) first insulating cylinders are identical with the structure of the second insulating cylinder, and the structural representation of insulating cylinder as shown in Figure 3.
2, the low-voltage arm resistance R of the first auxiliary-voltage divider is provided with
l1with the low-voltage arm resistance R of the second auxiliary-voltage divider
l2metal shielding box;
As shown in Figure 4, metal shielding box comprises top cover and base; Top cover is provided with the first lead terminal 14, second lead terminal 12 and the 3rd lead terminal 16; Base is provided with the first outlet terminal 15, second outlet terminal 13, the 3rd outlet terminal 18 and the 4th outlet terminal 17;
Low-voltage arm resistance R
l1with low-voltage arm resistance R
l2connected mode after series connection is:
Low-voltage arm resistance R
l1a branch road of the other end is connected with the second lead terminal 12, and another article of branch road is connected with the 3rd lead terminal 16; Low-voltage arm resistance R
l2a branch road of the other end is connected with the second outlet terminal 13, and another article of branch road is connected with the 3rd outlet terminal 18; Low-voltage arm resistance R
l1with low-voltage arm resistance R
l2a branch road of tie point is connected with the first lead terminal 14, and 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.
3, when carrying out the operation of step 1:
Apply DC voltage U, using the first auxiliary-voltage divider as with reference to standard, measure the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
a(U), be connected by the lead-in wire of the metal cover board side of the first insulating cylinder with external dc power, the lead-in wire 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 as shown in Figure 2.
When carrying out the operation of step 2:
Apply DC voltage U, using the second auxiliary-voltage divider as with reference to standard, measure the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
b(U), be connected by the lead-in wire of the metal cover board side of the second insulating cylinder with external dc power, the lead-in wire 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 as shown in Figure 2.
When carrying out the operation of step 3:
Apply DC voltage 2U, the voltage divider branch road formed using the first auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider, as with reference to standard, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
c(2U), the lead-in wire of the metal cover board side of the first insulating cylinder is connected with external dc power, the lead-in wire of metal chassis side is connected with the lead-in wire of the metal cover board side of the second insulating cylinder, the lead-in wire of the metal chassis side of the second insulating cylinder is connected with the second lead terminal of metal shielding box, the second outlet terminal ground connection.
The structural principle of described voltage divider branch road as shown in Figure 2.
4, the structural principle of divider to be measured is as resistance R in Fig. 2
l3and R
h3shown in series arm.
5, low-voltage arm resistance R is measured
l1the voltage at two ends comprises: gather the magnitude of voltage between the 3rd lead terminal of metal shielding box and the 4th outlet terminal.
Measure low-voltage arm resistance R
l2the voltage at two ends comprises: gather the magnitude of voltage between the 3rd outlet terminal of metal shielding box and the 4th outlet terminal.
Measure low-voltage arm resistance R
l1with low-voltage arm resistance R
l2after series connection, the voltage at two ends comprises: gather the magnitude of voltage between the 3rd lead terminal of metal shielding box and the 3rd outlet terminal.
6, all lead terminals of metal shielding box and outlet terminal are equipped with insulating sleeve 11 to ensure that terminal and metal shielding box insulate, and insulating sleeve 11 seals with terminal and metal shielding box shell 8 sealing ensureing metal shielding box.
Finally should be noted that: described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the application's protection.
Claims (6)
1. based on an intrinsic standoff ratio voltage coefficient detection method for separable DC voltage divider, it is characterized in that, described separable DC voltage divider comprises the first auxiliary-voltage divider and the second auxiliary-voltage divider; Described method comprises:
Step 1: simultaneously apply DC voltage U in the first auxiliary-voltage divider and divider to be measured, with the first auxiliary-voltage divider for normative reference, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
a(U);
Step 2: simultaneously apply DC voltage U in the second auxiliary-voltage divider and divider to be measured, with the second auxiliary-voltage divider for normative reference, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
b(U);
Step 3: the first auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider are formed voltage divider branch road; Described voltage divider branch road and divider to be measured apply DC voltage 2U simultaneously, with described voltage divider branch road for normative reference, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
c(2U);
Step 4: the voltage relative error obtained according to step 1-step 3 calculates described divider to be measured from voltage U to the DC partial voltage of voltage 2U than voltage coefficient γ (2U).
2. the method for claim 1, is characterized in that, the low-voltage arm resistance R of described first auxiliary-voltage divider
l1resistance and the low-voltage arm resistance R of the second auxiliary-voltage divider
l2resistance identical, and described low-voltage arm resistance R
l1with low-voltage arm resistance R
l2be the low-voltage arm resistance R of described divider to be measured
l3resistance half;
The high-voltage arm resistance R of described first auxiliary-voltage divider
h1resistance and the high-voltage arm resistance R of the second auxiliary-voltage divider
h2resistance identical, and described high-voltage arm resistance R
h1with high-voltage arm resistance R
h2be the high-voltage arm resistance R of described divider to be measured
h3resistance half.
3. the method for claim 1, is characterized in that, in described step 4, DC partial voltage than the computing formula of voltage coefficient γ (2U) is:
γ(2U)＝0.5[ε
a(U)+ε
b(U)]-ε
c(2U) (1)。
4. the method for claim 1, is characterized in that, described separable DC voltage divider comprises the high-voltage arm resistance R being provided with the first auxiliary-voltage divider
h1the first insulating cylinder, be provided with the high-voltage arm resistance R of the second auxiliary-voltage divider
h2the second insulating cylinder, and be provided with the low-voltage arm resistance R of the first auxiliary-voltage divider
l1with the low-voltage arm resistance R of the second auxiliary-voltage divider
l2metal shielding box;
Described first insulating cylinder is the airtight pillar buoy be made up of metal cover board, metal chassis and insulating arthropleura; Described high-voltage arm resistance R
h1one end lead-in wire lead to outside the first insulating cylinder by described metal cover board, the other end lead-in wire lead to outside the first insulating cylinder by described metal chassis; The outside of described lead-in wire is provided with insulating sleeve to ensure lead-in wire and metal cover board, and insulate with metal chassis, and described insulating sleeve seals the sealing to ensure the first insulating cylinder with lead-in wire, metal cover board and metal chassis respectively;
Described second insulating cylinder is the airtight pillar buoy be made up of metal cover board, metal chassis and insulating arthropleura; Described high-voltage arm resistance R
h2one end lead-in wire lead to outside the second insulating cylinder by described metal cover board, the other end lead-in wire lead to outside the second insulating cylinder by described metal chassis; The outside of described lead-in wire is provided with insulating sleeve to ensure lead-in wire and metal cover board, and insulate with metal chassis, and described insulating sleeve seals the sealing to ensure the second insulating cylinder with lead-in wire, metal cover board and metal chassis respectively;
Described metal shielding box comprises top cover and base; Described top cover is provided with the first lead terminal, the second lead terminal and 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 R
l1with low-voltage arm resistance R
l2connected mode after series connection comprises:
Low-voltage arm resistance R
l1a branch road of the other end is connected with described second lead terminal, and another article of branch road is connected with described 3rd lead terminal; Low-voltage arm resistance R
l2a branch road of the other end is connected with described second outlet terminal, and another article of branch road is connected with described 3rd outlet terminal; Low-voltage arm resistance R
l1with low-voltage arm resistance R
l2a branch road of tie point is connected with described first lead terminal, and a branch road is connected with described first outlet terminal, and one article of branch road is connected with described 4th outlet terminal.
5. method as claimed in claim 4, is characterized in that, described first auxiliary-voltage divider, as with reference to standard, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
a(U) time: be connected with external dc power by the lead-in wire of the metal cover board side of described first insulating cylinder, the lead-in wire of described metal chassis side is connected with the second lead terminal of described metal shielding box, described first outlet terminal ground connection;
Described second auxiliary-voltage divider, as with reference to standard, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
b(U) time: be connected with external dc power by the lead-in wire of the metal cover board side of described second insulating cylinder, the lead-in wire of described metal chassis side is connected with the first lead terminal of described metal shielding box, described second outlet terminal ground connection;
The voltage divider branch road that described first auxiliary-voltage divider and the series connection of the second auxiliary-voltage divider are formed, as with reference to standard, measures the voltage relative error ε at the low-voltage arm resistance two ends of divider to be measured
c(2U) time: the lead-in wire of the metal cover board side of the first insulating cylinder is connected with external dc power, the lead-in wire of metal chassis side is connected with the lead-in wire of the metal cover board side of the second insulating cylinder, the lead-in wire of the metal chassis side of the second insulating cylinder is connected with the second lead terminal of described metal shielding box, described second outlet terminal ground connection.
6. method as claimed in claim 4, is characterized in that, measure described low-voltage arm resistance R
l1the voltage at two ends comprises: gather 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 R
l2the voltage at two ends comprises:
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 R
l1with low-voltage arm resistance R
l2after series connection, the voltage at two ends comprises:
Gather the magnitude of voltage between the 3rd lead terminal of described metal shielding box and the 3rd outlet terminal.
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