CN204287327U - A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit - Google Patents
A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit Download PDFInfo
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- CN204287327U CN204287327U CN201420835900.3U CN201420835900U CN204287327U CN 204287327 U CN204287327 U CN 204287327U CN 201420835900 U CN201420835900 U CN 201420835900U CN 204287327 U CN204287327 U CN 204287327U
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Abstract
A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit described in the utility model, comprises the three-phase conducting wire, variable voltage source, voltage transformer (VT), the first measurement mechanism, the second measurement mechanism, data processing unit, the first current transformer, the second current transformer, the voltage division processing circuit that are parallel to each other; The ending two ends of described three-phase conducting wire are interconnected respectively, first current transformer is serially connected in the tail end of three-phase conducting wire, the other end is connected with data processing unit through the second measurement mechanism, the head end that second current transformer is serially connected in the head end of three-phase conducting wire, variable voltage source is connected to three-phase conducting wire, the input end of voltage transformer (VT) is connected to the middle part of three-phase conducting wire, output terminal is connected with the first measurement mechanism.The utility model is revised by the voltage division processing circuit mean value measuring transmission line of electricity two ends, solves the impact of the distributed capacitance on transmission line of electricity on zero sequence parameter measurement, thus substantially increases the precision of power transmission line zero-sequence parameter measurements.
Description
Technical field
The utility model relates to power system transmission line parameter field of measuring technique, is specifically related to a kind of ultra-high-tension power transmission line zero sequence impedance metering circuit.
Background technology
Transmission line of electricity is the carrier of electric power conveying, is one of chief component of electric system, plays an important role to electric system.The power frequency parameter of transmission line of electricity mainly comprises the mutual inductance etc. between positive sequence impedance, positive sequence electric capacity, zero sequence impedance, zero sequence electric capacity and many times mutual inductance circuits; these parameters are used for electric system and carry out Load flow calculation, calculation of short-circuit current, relay protection setting calculation and select power system operation mode, and its accuracy is directly connected to the accuracy of these result of calculations.The parameter obtaining transmission line of electricity exactly has important meaning for electric system, especially along with the development of China's electric system, the continuous expansion of electrical network, improving constantly of Automation of Electric Systems degree, more and more higher to the accuracy requirement of transmission line parameter.The calculating of line parameter circuit value is comparatively complicated, simultaneously by the impact of a lot of uncertain factor, comprises the factors such as the geometric configuration of circuit, electric current, environment temperature, wind speed, soil resistivity, lightning conducter erection mode and line route.Random nature of the line drop of long distance powedr transmission, the kelvin effect of alive circuit and heating, geological condition etc. bring difficulty all can to accurate Calculation line parameter circuit value.Usually known transmission line parameter be circuit build up the initial stage measure, these parameters after putting into operation because the impact of the factors such as weather, temperature, environment and geography can more or less change.Therefore, be necessary in depth to study interactional mechanism between parallel circuit comprehensively, in conjunction with the Adaptability Analysis of existing method of testing, the special technical requirement to parallel circuit parameter testing is proposed, for the accuracy of correct selected parameter method of testing and test and reliability provide foundation.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of ultra-high-tension power transmission line zero sequence impedance metering circuit, solves the impact of the distributed capacitance on transmission line of electricity on zero sequence parameter measurement, thus substantially increases the precision of power transmission line zero-sequence parameter measurements.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit, comprises the three-phase conducting wire, variable voltage source, voltage transformer (VT), the first measurement mechanism, the second measurement mechanism, data processing unit, the first current transformer, the second current transformer, the voltage division processing circuit that are parallel to each other; The ending two ends of described three-phase conducting wire are interconnected respectively, described first current transformer is serially connected in the tail end of three-phase conducting wire, one end ground connection of its output terminal, the other end are connected with data processing unit through the second measurement mechanism, described second current transformer is serially connected in the head end of three-phase conducting wire, one end ground connection of its output terminal, the other end are connected with the first measurement mechanism, described variable voltage source is connected to the head end of three-phase conducting wire, and the input end of described voltage transformer (VT) is connected to the middle part of three-phase conducting wire, output terminal is connected with the first measurement mechanism; Described voltage division processing circuit comprises filter, the first electric capacity, sensor, the second electric capacity; The input end of described filter is connected to the Nodes between the second current transformer and the first measurement mechanism through switch, the output terminal of filter is connected with sensor secondary side through the first electric capacity, the two ends being attempted by data processing unit of the primary side of sensor, described second Capacitance parallel connection is at the two ends of sensor primary side.
Described voltage division processing circuit also comprises resistance, and described resistor coupled in parallel is at the two ends of the second electric capacity.
Described filter is made up of the 3rd electric capacity, inductance, and one end of described inductance is connected with switch, and the other end is connected with the first electric capacity, the Nodes be connected between the first measurement mechanism and inductance of one end of described 3rd electric capacity, other end ground connection.
The beneficial effects of the utility model are: the utility model is revised by the voltage division processing circuit mean value measuring transmission line of electricity two ends, solve the impact of the distributed capacitance on transmission line of electricity on zero sequence parameter measurement, thus substantially increase the precision of power transmission line zero-sequence parameter measurements.In impedance path, a standard voltage-dividing capacitor of connecting, thus form partial-pressure structure, and while transmission Partial discharge signal, can also the voltage signal of equipment.This voltage signal, by after low-pass filter filtering higher hamonic wave, enters measurement mechanism and obtains equipment high tension voltage, thus improve the accuracy of test.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model will be further described.
As shown in Figure 1, the ultra-high-tension power transmission line zero sequence impedance metering circuit of the present embodiment, comprises A, B, C three-phase conducting wire, variable voltage source 1, voltage transformer (VT) 2, first measurement mechanism 3, second measurement mechanism 4, data processing unit 5, first current transformer 6, second current transformer 7, the voltage division processing circuit that are parallel to each other; The ending two ends of three-phase conducting wire are interconnected respectively, first current transformer 6 is serially connected in the tail end of three-phase conducting wire, one end ground connection of its output terminal, the other end are connected with data processing unit 5 through the second measurement mechanism 4, second current transformer 7 is serially connected in the head end of three-phase conducting wire, one end ground connection of its output terminal, the other end are connected with the first measurement mechanism 3, variable voltage source 1 is connected to the head end of three-phase conducting wire, and the input end of voltage transformer (VT) 2 is connected to the middle part of three-phase conducting wire, output terminal is connected with the first measurement mechanism 3; Voltage division processing circuit comprises filter 91, first electric capacity 92, sensor 93, second electric capacity 94; The input end of filter 91 is connected to the Nodes between the second current transformer 7 and the first measurement mechanism 3 through K switch, the output terminal of filter 91 is connected with sensor 93 secondary side through the first electric capacity 92, the two ends being attempted by data processing unit 5 of the primary side of sensor 93, the second electric capacity 94 is connected in parallel on the two ends of sensor 93 primary side.Voltage division processing circuit also comprises compensating resistance R, and resistance R is connected in parallel on the two ends of the second electric capacity 94.
Further, filter 91 is made up of the 3rd electric capacity 911, inductance 912, and one end of inductance 912 is connected with K switch, and the other end is connected with the first electric capacity 92, the Nodes be connected between the first measurement mechanism 3 and inductance 912 of one end of the 3rd electric capacity 911, other end ground connection.
The utility model is revised by the voltage division processing circuit mean value measuring transmission line of electricity two ends, and the distributed capacitance solved on transmission line of electricity aligns the impact that order parameter is measured, thus substantially increases the precision of electric transmission line positive sequence parameter measurements.In impedance path, a standard voltage-dividing capacitor of connecting, thus form partial-pressure structure, and while transmission Partial discharge signal, can also the voltage signal of equipment.This voltage signal, by after low-pass filter filtering higher hamonic wave, enters measurement mechanism and obtains equipment high tension voltage, thus improve the accuracy of test.
Those skilled in the art will be appreciated that; above embodiment is only used to the utility model is described; and be not used as restriction of the present utility model; as long as within spirit of the present utility model, the suitable change do above embodiment and change all drop within the claimed scope of the utility model.
Claims (3)
1. a ultra-high-tension power transmission line zero sequence impedance metering circuit, is characterized in that: comprise the three-phase conducting wire, variable voltage source (1), voltage transformer (VT) (2), the first measurement mechanism (3), the second measurement mechanism (4), data processing unit (5), the first current transformer (6), the second current transformer (7), the voltage division processing circuit that are parallel to each other, the ending two ends of described three-phase conducting wire are interconnected respectively, described first current transformer (6) is serially connected in the tail end of three-phase conducting wire, one end ground connection of its output terminal, the other end is connected with data processing unit (5) through the second measurement mechanism (4), described second current transformer (7) is serially connected in the head end of three-phase conducting wire, one end ground connection of its output terminal, the other end is connected with the first measurement mechanism (3), described variable voltage source (1) is connected to the head end of three-phase conducting wire, the input end of described voltage transformer (VT) (2) is connected to the middle part of three-phase conducting wire, output terminal is connected with the first measurement mechanism (3), described voltage division processing circuit comprises filter (91), the first electric capacity (92), sensor (93), the second electric capacity (94), the input end of described filter (91) is connected to the Nodes between the second current transformer (7) and the first measurement mechanism (3) through switch (K), the output terminal of filter (91) is connected with sensor (93) secondary side through the first electric capacity (92), the two ends being attempted by data processing unit (5) of the primary side of sensor (93), described second electric capacity (94) is connected in parallel on the two ends of sensor (93) primary side.
2. a kind of ultra-high-tension power transmission line zero sequence impedance metering circuit according to claim 1, it is characterized in that: described voltage division processing circuit also comprises resistance (R), described resistance (R) is connected in parallel on the two ends of two electric capacity (94).
3. a kind of ultra-high-tension power transmission line zero sequence impedance metering circuit according to claim 1, it is characterized in that: described filter (91) is made up of the 3rd electric capacity (911), inductance (912), one end of described inductance (912) is connected with switch (K), the other end is connected with the first electric capacity (92), the Nodes be connected between the first measurement mechanism (3) and inductance (912) of one end of described 3rd electric capacity (911), other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420835900.3U CN204287327U (en) | 2014-12-25 | 2014-12-25 | A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420835900.3U CN204287327U (en) | 2014-12-25 | 2014-12-25 | A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit |
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| CN204287327U true CN204287327U (en) | 2015-04-22 |
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| CN201420835900.3U Withdrawn - After Issue CN204287327U (en) | 2014-12-25 | 2014-12-25 | A kind of ultra-high-tension power transmission line zero sequence impedance metering circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459330A (en) * | 2014-12-25 | 2015-03-25 | 国家电网公司 | High-voltage transmission line zero-sequence impedance measuring circuit and method |
| WO2024047379A1 (en) * | 2022-08-29 | 2024-03-07 | Mahdi Davarpanah | Zero-sequence impedance measurement of coupled ac transmission lines |
-
2014
- 2014-12-25 CN CN201420835900.3U patent/CN204287327U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459330A (en) * | 2014-12-25 | 2015-03-25 | 国家电网公司 | High-voltage transmission line zero-sequence impedance measuring circuit and method |
| CN104459330B (en) * | 2014-12-25 | 2017-04-12 | 国家电网公司 | High-voltage transmission line zero-sequence impedance measuring circuit and method |
| WO2024047379A1 (en) * | 2022-08-29 | 2024-03-07 | Mahdi Davarpanah | Zero-sequence impedance measurement of coupled ac transmission lines |
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Granted publication date: 20150422 Effective date of abandoning: 20170412 |