CN105699924A - Proximity grounding body error influence test apparatus and test method thereof - Google Patents
Proximity grounding body error influence test apparatus and test method thereof Download PDFInfo
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Abstract
The invention relates to an error influence test method for extra-high-voltage CVT (capacitor voltage transformer). The test method can be utilized to measure voltage measurement error of the extra-high-voltage CVT under the influence of a proximity grounding body. The apparatus includes a voltage regulator, a transformer test, a standard transformer and an equipotential shielding capacitor voltage transformer test piece (CVT) and a grounding body; the primary side of the test transformer is connected with the voltage regulator; one end of the secondary side of the test transformer is grounded, and the other end of the secondary side of the test transformer is connected with one end of a current limiting resistor R; the other end of the current limiting resistor R is connected with the primary side of the standard voltage transformer and the primary side of the CVT; and the secondary side of the standard voltage transformer and the secondary side of the CVT are both connected with a transformer calibrator. With the test apparatus and test method of the invention adopted, whether the accuracy of the CVT can still satisfy a requirement of high precision when proximity equipment is grounded under a situation that a proximity grounding body exists can be verified successfully through simulation, and whether error generated by the above circumstance is smaller than that of a traditional structure CVT can be verified successfully through simulation.
Description
Technical field
The present invention relates to a kind of power system transformer device and method thereof, affect assay device and test method thereof in particular to the contiguous grounding body error of one。
Background technology
Along with the engineer applied of China's extra-high voltage (exchange 1000kV and more than) technology of transmission of electricity, accurately measuring of extra-high voltage grid voltage becomes the key technical problem solved that requires study。The wide variety of power frequency high voltage meter of domestic and international power system mainly has electromagnetic potential transformer and capacitance type potential transformer two kinds (both of which belongs to passive voltage and measures system), substantially disclosure satisfy that 500kV and the requirement of following electric pressure voltage measurement and relay protection。Optical Potential Transformer, electronic type voltage transformer (belong to active voltage and measure system) are also in research and development and trail run process at present, still there are the problems such as voltage measurement accuracy, laser life-span, system reliability to research and solve further, not yet obtain sizable application。
When entering ultra-high/extra-high voltage grade, electromagnetic potential transformer seldom adopts due to the difficulty that insulate。Capacitance type potential transformer (CVT) due to simple in construction, reliability is high, cost is relatively low, is still the capital equipment of ultra-high/extra-high voltage level Grid voltage measurement。But, the design of domestic and international existing CVT is applied to extra-high voltage grid, encounters following technical difficulty:
1) stray capacitive currents affects accuracy of measurement:
Traditional capacitance type potential transformer (CVT), owing to there is stray capacitance between capacitive divider high-voltage arm and grounding body or electrical body around, under action of high voltage, stray capacitive currents flows out or flows into high-voltage arm, causes voltage measurement error。This error strengthens along with increasing of electric pressure。NORTHWEST CHINA 750kV electrical network capacitance type potential transformer measured result, the measurement error that stray electrical current (includes capacitance current and insulation sleeve surface leakage current) and causes may be up to more than 0.2%。Electric Field Simulation shows, the CVT of 1000kV, flows into the capacitance current of the earth up to 20mA from potentiometer high-voltage arm, causes significant measurement error。The measure strengthening potentiometer main capacitance amount is generally adopted to reduce the impact of stray electrical current, even if capacitance increases to the class of accuracy also difficult standard reaching 0.1 grade of 10000pf, extra-high voltage CVT。
2) on-the-spot effect difficulty:
Existing CVT measurement error by stray capacitance influences thus relevant with installation site。After the CVT of ultra-high/extra-high voltage electric pressure installs at the scene, it is necessary to carry out on-the-spot effect, in order to revise the ratio and angular difference that measure when dispatching from the factory。The on-the-spot effect carrying out transformer at ultra-high voltage transformer station is by no means easy。Except extra-high voltage reference capacitor manufacture difficulty, the on-the-spot electromagnetic interference of ultra-high voltage transformer station be also by the important restriction factor of on-the-spot accurately effect comparison。
3) CVT response characteristic problem:
The response characteristic of voltage transformer is proposed increasingly higher requirement by the extensive use of digital relay protection system, it is desirable to transformer secondary voltage should quick and precisely reflect the change of primary voltage。Relevant regulatory requirements, after transformer primary shorted to earth, secondary voltage should be down to less than the 0.1 of initial value within 0.2 second。Existing CVT all adopts the ferromagnetic resonance antivibrator that energy-storage travelling wave tube forms, to suppress issuable ferromagnetic resonance in electromagnetic unit。The introducing of energy-storage travelling wave tube makes the response characteristic of transformer be deteriorated, it is difficult to meet the requirement of extra-high voltage grid relay protection quick and precisely action。
For this series of problem, it is proposed that equal potential shielded capacitor voltage transformer, this transformer has high accuracy, quickly responds, exempts from the feature of on-the-spot effect。The contiguous grounding body error still not carried out for capacitance type potential transformer at present affects test method。
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of contiguous grounding body error and affect assay device and test method thereof, the present invention successfully simulates the situation that there is contiguous grounding body, demonstrate capacitance type potential transformer CVT under nearby device Grounding, whether its accuracy still can reach the requirement of high accuracy class of accuracy, and whether the error change produced in these cases is less than traditional structure capacitance type potential transformer CVT。
It is an object of the invention to adopt following technical proposals to realize:
The present invention provides a kind of contiguous grounding body error to affect assay device, and it thes improvement is that, described device includes pressure regulator, testing transformer, standard mutual inductor and equal potential shielded capacitor voltage transformer test product and grounding body；The former limit of described transformator is connected with pressure regulator, one end ground connection of secondary, and the other end is connected with one end of current-limiting resistance R；The other end of current-limiting resistance R is connected with the primary side of the primary side of standard potential transformer and equal potential shielded capacitor voltage transformer test product respectively；The secondary side of described standard potential transformer and the secondary side of equal potential shielded capacitor voltage transformer test product are all connected with mutual-inductor tester；Between grounding body and equal potential shielded capacitor voltage transformer test product noiseless。
Further, described pressure regulator, standard potential transformer, equal potential shielded capacitor voltage transformer test product and the contiguous equal ground connection of grounding body。
Further, select two grading rings identical with equal potential shielded capacitor voltage transformer test product big grading ring profile, and in arranging up and down, hang or be supported on by equal potential shielded capacitor voltage transformer test product as described grounding body；Along contour under the height of described grounding body and equal potential shielded capacitor voltage transformer test product grading ring, earth lead is from the drop-down ground connection of grading ring central vertical of described grounding body。
Further, capacitance type potential transformer distance grounding body and the equal potential shielded capacitor voltage transformer test product of measuring supply voltage are enough remote, equal potential shielded capacitor voltage transformer test product distance test (DT) transformator is enough remote, and (required distance herein is with noiseless for foundation to test product, it is to avoid owing to the object around test product is owing to distance test product is crossed near thus the result of the test of test product is produced interference。For different concrete tests, owing to experimental condition is different, distance is also different。Need specifically to consider as the case may be。)
The present invention also provides for a kind of grounding body error of being close to affects the test method of assay device, and it thes improvement is that, described method comprises the steps:
1. grounding body is determined；
2. grounding body is set by equal potential shielded capacitor voltage transformer test product；
3. grounding body and the equal potential shielded capacitor voltage transformer test product error under varying level distance is measured。
Further, described step 1. in, select two grading rings identical with equal potential shielded capacitor voltage transformer test product big grading ring profile, and in arranging up and down, hang or be supported on by equal potential shielded capacitor voltage transformer test product as described grounding body；Along contour under the height of described grounding body and equal potential shielded capacitor voltage transformer test product grading ring, earth lead is from the drop-down ground connection of grading ring central vertical of described grounding body。
Further, described step 2. in, arrange equal potential shielded capacitor voltage transformer test product and grounding body according to different distance, carry out error measure when different distance；The distance chosen is more than the minimum safe distance of test product, and to have on-the-spot operability。
Further, described step 3. in, when measuring different conductor ground connection, the error of equal potential shielded capacitor voltage transformer test product is affected。The shape of grounding body, size, highly, earthing mode and test product distance all error is had impact。This test method, after considering test chamber physical condition and measuring feasibility, have chosen a kind of specific grounding body。By comparing, it is known that the deviation size between test specimen and standard mutual inductor, thus the grade of errors of known sample。
Compared with the prior art, the present invention reaches to provide the benefit that:
A kind of contiguous grounding body error provided by the invention affects assay device and test method thereof, successfully simulate the situation that there is contiguous grounding body, demonstrate capacitance type potential transformer CVT under nearby device Grounding, whether its accuracy still can reach the requirement of high accuracy class of accuracy, and whether the error change produced in these cases is less than traditional structure capacitance type potential transformer CVT。
Test method provided by the invention can utilize on-the-spot existing capacitance type potential transformer CVT as grounding body, and grounding body takes different horizontal ranges from capacitance type potential transformer CVT test product and carries out error measure respectively。
The capacitance type potential transformer CVT distance grounding body measuring supply voltage is enough remote, and the CVT distance CVT test product measuring supply voltage is enough remote, and CVT test product distance test (DT) transformator is enough remote, reduces interference each other。
Accompanying drawing explanation
Fig. 1 is the test connection figure of the contiguous grounding body error impact test of equal potential shielded capacitor voltage transformer provided by the invention。
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail。
The present invention provides a kind of contiguous grounding body error to affect assay device, and this device includes testing transformer, pressure regulator, standard mutual inductor and equal potential shielded capacitor voltage transformer test product and grounding body；Described testing transformer T2Former limit and pressure regulator T1Connecting, one end ground connection of secondary, the other end is connected with one end of current-limiting resistance R；The other end of current-limiting resistance R is connected with the primary side of the primary side of standard potential transformer and equal potential shielded capacitor voltage transformer test product respectively；The secondary side of described standard potential transformer and the secondary side of equal potential shielded capacitor voltage transformer test product are all connected with mutual-inductor tester；Grounding body and equal potential shielded capacitor voltage transformer test product are enough remote, and (required distance herein is with noiseless for foundation to test product, it is to avoid owing to the object around test product is owing to distance test product is crossed near thus the result of the test of test product is produced interference。For different concrete tests, owing to experimental condition is different, distance is also different。Need specifically to consider as the case may be。)。Test connection figure is as shown in Figure 1。
Pressure regulator T1, standard potential transformer, equal potential shielded capacitor voltage transformer test product and the contiguous equal ground connection of grounding body。
Select two grading rings identical with equal potential shielded capacitor voltage transformer test product big grading ring profile, and in arranging up and down, hang or be supported on by equal potential shielded capacitor voltage transformer test product as described grounding body；Along contour under the height of described grounding body and equal potential shielded capacitor voltage transformer test product grading ring, earth lead is from the drop-down ground connection of grading ring central vertical of described grounding body。
Capacitance type potential transformer distance grounding body and the equal potential shielded capacitor voltage transformer test product of measuring supply voltage are enough remote, equal potential shielded capacitor voltage transformer test product distance test (DT) transformator is enough remote, and (required distance herein is with noiseless for foundation to test product, it is to avoid owing to the object around test product is owing to distance test product is crossed near thus the result of the test of test product is produced interference。For different concrete tests, owing to experimental condition is different, distance is also different。Need specifically to consider as the case may be。)
The present invention also provides for a kind of grounding body error of being close to affects the test method of assay device, and the method comprises the steps:
1. select two grading rings of identical with equal potential shielded capacitor voltage transformer test product big grading ring profile (ring footpath, caliber), and in arranging up and down, hang or be supported on by equal potential shielded capacitor voltage transformer test product as described grounding body；Along contour under the height of described grounding body and equal potential shielded capacitor voltage transformer test product grading ring, earth lead is from the drop-down ground connection of grading ring central vertical of described grounding body。
2. conductor analogue ground body is set by equal potential shielded capacitor voltage transformer test product；
3. error during different conductor ground connection is measured；
4. grounding body and the equal potential shielded capacitor voltage transformer test product error under varying level distance is measured；The shape of grounding body, size, highly, earthing mode and test product distance all error is had impact。This test method, after considering test chamber physical condition and measuring feasibility, have chosen a kind of specific grounding body。By comparing, it is known that the deviation size between test specimen and standard mutual inductor, thus the grade of errors of known sample。
Equal potential shielded capacitor voltage transformer CVT test product error measurement method " is measured by voltage ct calibrating code " with reference to JJG314-2010。
Test method provided by the invention can change supply voltage grade (this test adopts 1000kV electric pressure) according to test requirements document, the conductor shape near equal potential shielded capacitor voltage transformer CVT test product and size can be positioned over according to testing ground situation and practical operation situation change, to obtain the error impact at present of different conductor ground connection, can according to circumstances changing the horizontal range between neighbouring conductor and CVT test product, the error that during to obtain different distance, equal potential shielded capacitor voltage transformer CVT test product is caused by contiguous grounding body affects situation。
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit; although the present invention being described in detail with reference to above-described embodiment; the specific embodiment of the present invention still can be modified or equivalent replacement by those of ordinary skill in the field; these are without departing from any amendment of spirit and scope of the invention or equivalent replace, within the claims of the present invention all awaited the reply in application。
Claims (8)
1. a contiguous grounding body error affects assay device, it is characterised in that described device includes pressure regulator, testing transformer, standard mutual inductor and equal potential shielded capacitor voltage transformer test product and grounding body；The former limit of described testing transformer is connected with pressure regulator, one end ground connection of secondary, and the other end is connected with one end of current-limiting resistance R；The other end of current-limiting resistance R is connected with the primary side of the primary side of standard potential transformer and equal potential shielded capacitor voltage transformer test product respectively；The secondary side of described standard potential transformer and the secondary side of equal potential shielded capacitor voltage transformer test product are all connected with mutual-inductor tester；Between grounding body and equal potential shielded capacitor voltage transformer test product noiseless。
2. contiguous grounding body error as claimed in claim 1 affects assay device, it is characterised in that described pressure regulator, standard potential transformer, equal potential shielded capacitor voltage transformer test product and the contiguous equal ground connection of grounding body。
3. contiguous grounding body error as claimed in claim 1 affects assay device, it is characterized in that, select two grading rings identical with equal potential shielded capacitor voltage transformer test product big grading ring profile, and in arranging up and down, hang or be supported on by equal potential shielded capacitor voltage transformer test product as described grounding body；Along contour under the height of described grounding body and equal potential shielded capacitor voltage transformer test product grading ring, earth lead is from the drop-down ground connection of grading ring central vertical of described grounding body。
4. contiguous grounding body error as claimed in claim 1 affects assay device, it is characterized in that, capacitance type potential transformer distance grounding body and the equal potential shielded capacitor voltage transformer test product of measuring supply voltage are enough remote, and equal potential shielded capacitor voltage transformer test product distance test (DT) transformator is enough remote。
5. the contiguous grounding body error as according to any one of claim 1-4 affects the test method of assay device, it is characterised in that described method comprises the steps:
1. grounding body is determined；
2. grounding body is set by equal potential shielded capacitor voltage transformer test product；
3. grounding body and the equal potential shielded capacitor voltage transformer test product error under varying level distance is measured。
6. test method as claimed in claim 5, it is characterized in that, described step 1. in, select two grading rings identical with equal potential shielded capacitor voltage transformer test product big grading ring profile, and in arranging up and down, hang or be supported on by equal potential shielded capacitor voltage transformer test product as described grounding body；Along contour under the height of described grounding body and equal potential shielded capacitor voltage transformer test product grading ring, earth lead is from the drop-down ground connection of grading ring central vertical of described grounding body。
7. test method as claimed in claim 5, it is characterised in that described step 2. in, arrange equal potential shielded capacitor voltage transformer test product and grounding body according to different distance, carry out error measure when different distance；The distance chosen is more than the minimum safe distance of test product, and to have on-the-spot operability。
8. test method as claimed in claim 5, it is characterised in that described step 3. in, when measuring different conductor ground connection, the error of equal potential shielded capacitor voltage transformer test product is affected。
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Cited By (1)
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| CN106570209A (en) * | 2016-10-10 | 2017-04-19 | 广州市格宁电气有限公司 | AC resistance voltage divider correction method for error model established based on equivalence principle |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106570209A (en) * | 2016-10-10 | 2017-04-19 | 广州市格宁电气有限公司 | AC resistance voltage divider correction method for error model established based on equivalence principle |
| CN106570209B (en) * | 2016-10-10 | 2021-06-04 | 广州市格宁电气有限公司 | Alternating current resistor voltage divider correction method for establishing error model based on equivalence principle |
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