CN105699929A - Equivalent leakage current error influence test device and test method thereof - Google Patents
Equivalent leakage current error influence test device and test method thereof Download PDFInfo
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- CN105699929A CN105699929A CN201410682159.6A CN201410682159A CN105699929A CN 105699929 A CN105699929 A CN 105699929A CN 201410682159 A CN201410682159 A CN 201410682159A CN 105699929 A CN105699929 A CN 105699929A
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Abstract
The invention relates to an equivalent leakage current error influence test device and a test method thereof. The device includes a voltage regulator, a test transformer, a standard transformer, a CVT test piece and a resistance body; power source voltage is connected into the primary sides of the standard voltage transformer and the CVT test piece through the test transformer and a current limiting resistor; 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 the current limiting resistor; the other end of the current limiting resistor is connected with the primary side of the standard voltage transformer and the primary side of the CVT test piece; the secondary side of the standard voltage transformer and the secondary side of the CVT test piece are both connected with a transformer calibrator; and the resistance body is connected in parallel with two ends of a single capacitor unit of the CVT test piece so as to simulate equivalent leakage current. With the equivalent leakage current error influence test device and the test method thereof of the invention adopted, the leakage current situation of the CVT due to rain and dust is successfully simulated, and it is verified that the accuracy of the CVT can still satisfy a requirement for a high accuracy grade under the leakage current situation.
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 a kind of equivalence leakage current error。
Background technology
Along with the engineer applied of 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 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 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。The equivalent leakage current error still not carried out for capacitance type potential transformer at present affects test method, and this test method is the first。
Summary of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of equivalence leakage current error and affect assay device and test method thereof, successfully simulate CVT respectively in the leakage current situation produced because of rainwater, dust etc., and demonstrate CVT its accuracy in that case and still can reach the requirement of high accuracy class of accuracy, and the error change produced in these cases is less than traditional structure CVT。
It is an object of the invention to adopt following technical proposals to realize:
The present invention provides a kind of equivalence leakage current error to affect assay device, and it thes improvement is that, described device includes pressure regulator, testing transformer, standard mutual inductor, equal potential shielded capacitor voltage transformer test product and resistive element；Supply voltage accesses the primary side of standard capacitance formula voltage transformer and equal potential shielded capacitor voltage transformer test product by testing transformer and current-limiting resistance；The former limit of testing transformer is connected with pressure regulator, and one end ground connection of secondary, the other end is connected with one end of current-limiting resistance；The other end of current-limiting resistance 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 described secondary side of standard capacitance formula voltage transformer and the secondary side of equal potential shielded capacitor voltage transformer test product are all connected with mutual-inductor tester；Described resistive element is connected in parallel on the single-unit capacitor unit two ends of equal potential shielded capacitor voltage transformer test product, with analog equivalent leakage current。
Further, described pressure regulator, standard capacitance formula voltage transformer, equal potential shielded capacitor voltage transformer test product and the contiguous equal ground connection of grounding body。
Further, described resistive element includes with the single-unit equivalent potential screen capacitor unit parallel way of equal potential shielded capacitor voltage transformer test product:
The equal parallel resistance body of often economize on electricity container unit of equal potential shielded capacitor voltage transformer test product；
The first segment capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product；
The second section capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product。
Further, the two ends of described resistive element are respectively fixedly connected with in two end flanges often saving equivalent potential screen capacitor unit compound insulating sleeve。
Further, after described resistive element is first gone here and there by resistor and mode form, the resistance of resistive element configures according to the size of required analog equivalent leakage current, equivalence Leakage Current peak value in short-term between 30-50mA；Described resistor adopts high-tension resistive；The voltage of high-tension resistive need to coordinate concrete test voltage。
Further, the capacitance type potential transformer distance of measurement supply voltage and equal potential shielded capacitor voltage transformer test product are enough remote, and (required distance herein is with noiseless for foundation to test product, avoid the object around due to test product owing to distance test product is crossed near thus the result of the test of test product is produced interference), equal potential shielded capacitor voltage transformer test product distance test (DT) transformator is enough remote, to reduce interference each other；Described equal potential shielded capacitor voltage transformer error measure is with reference to measurement voltage ct calibrating code in JJG314-2010。
The present invention also provides for a kind of equivalence leakage current error affects the test method of assay device, it thes improvement is that, described method is at the single-unit capacitor unit two ends parallel resistance body of equal potential shielded capacitor voltage transformer test product, with the leakage current that equivalent simulation is produced on equal potential shielded capacitor voltage transformer test product surface by rainwater and dust。
Further, described resistive element includes with the single-unit capacitor unit parallel way of equal potential shielded capacitor voltage transformer test product:
The equal parallel resistance body of often economize on electricity container unit of equal potential shielded capacitor voltage transformer test product；
The first segment capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product；
The second section capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product。
Further, the two ends of described resistive element are respectively fixedly connected with in two end flanges often economizing on electricity container unit compound insulating sleeve。
Further, after described resistive element is first gone here and there by resistor and mode form, the resistance of resistive element configures according to the size of required analog equivalent leakage current, equivalence Leakage Current peak value in short-term between 30-50mA；Described resistor adopts high-tension resistive；The voltage of high-tension resistive need to coordinate concrete test voltage。
Compared with the prior art, the present invention reaches to provide the benefit that:
Equivalence leakage current error provided by the invention affects assay device and test method thereof, successfully simulate CVT respectively in the leakage current situation produced because of rainwater, dust etc., and demonstrate CVT its accuracy in that case and still can reach the requirement of high accuracy class of accuracy, and the error change produced in these cases is less than traditional structure CVT。
Test method provided by the invention can change supply voltage grade (this test adopts 1000kV electric pressure) according to test requirements document, the resistance value size of the resistive element with capacitor unit two ends in parallel can be changed according to testing ground situation and practical operation situation, to change the leakage current size on the transformer surface simulated, can according to circumstances change quantity and the parallel way of the resistive element with capacitor two ends in parallel, to simulate the leakage current situation on different units。Present invention reduces test difficulty, improve operability and lower relative analysis can be carried out with the CVT of traditional structure at same case。
Accompanying drawing explanation
Fig. 1 is that equivalence leakage current error provided by the invention affects assay device wiring diagram；
Fig. 2 is resistive element schematic diagram provided by the invention, wherein figure (a) is resistive element connected mode I: an often economize on electricity container unit resistive element all in parallel, figure (b) resistive element connection side's Formula II: only first segment capacitor unit parallel resistance body, figure (c) resistive element connection side's formula III: only second section capacitor unit parallel resistance body, figure (d) single-unit resistive element, Ra-Rd is resistive element, often economize on electricity resistance body by some resistor strings, compose in parallel；R1-R6 is resistor；
Fig. 3 is the resistive element schematic diagram after installation 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 equivalence leakage current error to affect assay device, and this device includes pressure regulator T1, testing transformer, standard mutual inductor, equal potential shielded capacitor voltage transformer test product and resistive element；Supply voltage passes through testing transformer T2With the primary side that current-limiting resistance accesses standard capacitance formula voltage transformer and equal potential shielded capacitor voltage transformer test product；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 described secondary side of standard capacitance formula voltage transformer and the secondary side of equal potential shielded capacitor voltage transformer test product are all connected with mutual-inductor tester；Described resistive element is connected in parallel on the single-unit capacitor unit two ends of equal potential shielded capacitor voltage transformer test product, with analog equivalent leakage current。Described pressure regulator T1, standard capacitance formula voltage transformer, equal potential shielded capacitor voltage transformer test product and the contiguous equal ground connection of grounding body。
According to quantity in parallel and parallel way such as Fig. 2 (a), (b), (c) of selecting resistive element, to simulate the transformer equivalence leakage current values under various operating mode, the single-unit capacitor unit parallel way of described resistive element and equal potential shielded capacitor voltage transformer test product includes:
The equal parallel resistance body of often economize on electricity container unit of equal potential shielded capacitor voltage transformer test product；
The first segment capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product；
The second section capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product。
The two ends of described resistive element are respectively fixedly connected with in two end flanges often economizing on electricity container unit compound insulating sleeve。
After described resistive element is first gone here and there by resistor and mode form, the resistance of resistive element configures according to the size of required analog equivalent leakage current, equivalence Leakage Current peak value in short-term between 30-50mA；Described resistor adopts high-tension resistive；The voltage of high-tension resistive need to coordinate concrete test voltage, as shown in Fig. 2 (d)。
The leakage current that the mode equivalent simulation of device provided by the invention resistive element in parallel is produced on CVT surface by rainwater and dust etc., reduces test difficulty with this, improves operability。Test connection figure as it is shown in figure 1, resistive element schematic diagram as shown in Figure 2。
The standard capacitance formula voltage transformer distance measuring supply voltage is enough remote with equal potential shielded capacitor voltage transformer test product, equal potential shielded capacitor voltage transformer test product distance test (DT) transformator is enough remote, to reduce interference (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) each other；Described equal potential shielded capacitor voltage transformer error measurement method is with reference to measurement voltage ct calibrating code in JJG314-2010。
The present invention also provides for a kind of equivalence leakage current error affects the test method of assay device, the method is at the single-unit capacitor unit two ends parallel resistance body of equal potential shielded capacitor voltage transformer test product, with the leakage current that equivalent simulation is produced on equal potential shielded capacitor voltage transformer test product surface by rainwater and dust。
Test method provided by the invention successfully simulates CVT respectively in the leakage current situation produced because of rainwater, dust etc., and demonstrate CVT its accuracy in that case and still can reach the requirement of high accuracy class of accuracy, and the error change produced in these cases is less than traditional structure CVT。This test method is at home and abroad to the utilization that still belongs to the first time in the test of CVT。
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 (10)
1. an equivalent leakage current error affects assay device, it is characterised in that described device includes pressure regulator, testing transformer, standard mutual inductor, equal potential shielded capacitor voltage transformer test product and resistive element；Supply voltage accesses the primary side of standard capacitance formula voltage transformer and equal potential shielded capacitor voltage transformer test product by testing transformer and current-limiting resistance；The former limit of testing transformer is connected with pressure regulator, and one end ground connection of secondary, the other end is connected with one end of current-limiting resistance；The other end of current-limiting resistance 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 described secondary side of standard capacitance formula voltage transformer and the secondary side of equal potential shielded capacitor voltage transformer test product are all connected with mutual-inductor tester；Described resistive element is connected in parallel on the single-unit capacitor unit two ends of equal potential shielded capacitor voltage transformer test product, with analog equivalent leakage current。
2. assay device as claimed in claim 1, it is characterised in that described pressure regulator, standard capacitance formula voltage transformer, equal potential shielded capacitor voltage transformer test product and the contiguous equal ground connection of grounding body。
3. assay device as claimed in claim 1, it is characterised in that the single-unit equivalent potential screen capacitor unit parallel way of described resistive element and equal potential shielded capacitor voltage transformer test product includes:
The equal parallel resistance body of often economize on electricity container unit of equal potential shielded capacitor voltage transformer test product；
The first segment capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product；
The second section capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product。
4. assay device as claimed in claim 3, it is characterised in that the two ends of described resistive element are respectively fixedly connected with in two end flanges often saving equivalent potential screen capacitor unit compound insulating sleeve。
5. assay device as claimed in claim 3, it is characterized in that, after described resistive element is first gone here and there by resistor and mode form, the resistance of resistive element configures according to the size of required analog equivalent leakage current, equivalence Leakage Current peak value in short-term between 30-50mA；Described resistor adopts high-tension resistive；The voltage of high-tension resistive need to coordinate concrete test voltage。
6. assay device as claimed in claim 1, it is characterized in that, the capacitance type potential transformer distance measuring supply voltage is enough remote with equal potential shielded capacitor voltage transformer test product, equal potential shielded capacitor voltage transformer test product distance test (DT) transformator is enough remote, to reduce interference each other；Described equal potential shielded capacitor voltage transformer error measure is with reference to measurement voltage ct calibrating code in JJG314-2010。
7. the equivalent leakage current error as according to any one of claim 1-6 affects the test method of assay device, it is characterized in that, described method is at the single-unit capacitor unit two ends parallel resistance body of equal potential shielded capacitor voltage transformer test product, with the leakage current that equivalent simulation is produced on equal potential shielded capacitor voltage transformer test product surface by rainwater and dust。
8. test method as claimed in claim 7, it is characterised in that the single-unit capacitor unit parallel way of described resistive element and equal potential shielded capacitor voltage transformer test product includes:
The equal parallel resistance body of often economize on electricity container unit of equal potential shielded capacitor voltage transformer test product；
The first segment capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product；
The second section capacitor unit parallel resistance body of equal potential shielded capacitor voltage transformer test product。
9. test method as claimed in claim 8, it is characterised in that the two ends of described resistive element are respectively fixedly connected with in two end flanges often economizing on electricity container unit compound insulating sleeve。
10. test method as claimed in claim 8, it is characterized in that, after described resistive element is first gone here and there by resistor and mode form, the resistance of resistive element configures according to the size of required analog equivalent leakage current, equivalence Leakage Current peak value in short-term between 30-50mA；Described resistor adopts high-tension resistive；The voltage of high-tension resistive need to coordinate concrete test voltage。
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Cited By (3)
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| CN116047363A (en) * | 2023-04-03 | 2023-05-02 | 华东交通大学 | Method and system for monitoring stray current of rail train |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107544046A (en) * | 2016-06-24 | 2018-01-05 | 中国电力科学研究院 | A kind of online error measuring system of voltage transformer and method |
| CN107544046B (en) * | 2016-06-24 | 2020-11-17 | 中国电力科学研究院 | Online error measurement system and method for voltage transformer |
| CN106443561A (en) * | 2016-09-23 | 2017-02-22 | 国网江西省电力公司电力科学研究院 | Overall inspection method and apparatus for electric energy metering devices of 35kV or below |
| CN106443561B (en) * | 2016-09-23 | 2023-06-16 | 国网江西省电力公司电力科学研究院 | Integral inspection method and device for electric energy metering device with voltage of 35kV or below |
| CN116047363A (en) * | 2023-04-03 | 2023-05-02 | 华东交通大学 | Method and system for monitoring stray current of rail train |
| CN116047363B (en) * | 2023-04-03 | 2023-08-18 | 华东交通大学 | Method and system for monitoring stray current of rail train |
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