CN105182269A - Voltage transformer calibration instrument with temperature measurement function - Google Patents
Voltage transformer calibration instrument with temperature measurement function Download PDFInfo
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- CN105182269A CN105182269A CN201510590648.3A CN201510590648A CN105182269A CN 105182269 A CN105182269 A CN 105182269A CN 201510590648 A CN201510590648 A CN 201510590648A CN 105182269 A CN105182269 A CN 105182269A
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Abstract
The invention relates to the technical field of field measurement of the power voltage transformer, especially to a voltage transformer calibration instrument with a temperature measurement function. The voltage transformer calibration instrument comprises a resistance-capacitance voltage-dividing circuit, a rectifier filter circuit, a 7805 voltage-stabilizing circuit and an electronic thermometer. The resistance-capacitance voltage-dividing circuit, the rectifier filter circuit, and the electronic thermometer are connected in parallel; the 7805 voltage-stabilizing circuit is connected to the connecting wire between the rectifier filter circuit and the electronic thermometer; and the other end of the 7805 voltage-stabilizing circuit is connected with a power supply. According to the invention, when a tester carries out comparison value error and phase error testing of the transformer, a real-time temperature at field can be read, so that the field testing data of the voltage transformer becomes scientific and accurate. Meanwhile, the power of the temperature module is from the voltage transformer calibration instrument. The structure is simple and the costs are saved. The voltage transformer calibration instrument can be widely applied to the power system.
Description
Technical field
The present invention relates to voltage of power mutual inductor on site field of measuring technique, particularly relate to a kind of voltage transformer (VT) tester with temperature measurement function.
Background technology
According to JJG314-2010 " measuring by voltage ct calibrating code " requirement, when carrying out site test to voltage transformer (VT), need to measure the temperature conditions at scene.But, due to scene test condition limit and the carelessness of staff, usually test real-time temperature is not measured.
The input voltage of electronic temp meter is generally 5V, usually cannot directly provide 5V power supply in site test.The secondary voltage of three-phase four-wire system voltage transformer (VT) is generally
when site test is carried out to voltage transformer (VT), need in parallel for the secondary terminals of the secondary voltage of voltage transformer (VT) and mutual-inductor tester.Therefore, mutual-inductor tester secondary terminals both end voltage is similarly
mutual inductor secondary voltage to be reduced to after 24V by D.C. regulated power supply 7805 lowering and stabilizing blood pressure by resistive-capacitive voltage divider circuit, export 5V direct current and can complete electronic temp meter is powered.Because this electronic thermometer immediately provides power supply when carrying out mutual inductor test by mutual inductor secondary, and be connected in parallel in mutual-inductor tester, therefore, a kind of voltage transformer (VT) tester with temperature measurement function is proposed herein, can make testing crew while carrying out mutual inductor ratio error and phase error test, the real-time temperature at scene is read, makes voltage transformer (VT) field test data science and accurately more.
Summary of the invention
For above-mentioned problems of the prior art, the invention provides a kind of voltage transformer (VT) tester with temperature measurement function, object is to provide a kind of while carrying out mutual inductor ratio error and phase error test, by the real-time temperature at scene accurately, carry out the tester that reads fast.
The technical solution adopted for the present invention to solve the technical problems is:
With a voltage transformer (VT) tester for temperature measurement function, comprise resistive-capacitive voltage divider circuit, current rectifying and wave filtering circuit, 7805 mu balanced circuits and electronic temp meter; Resistive-capacitive voltage divider circuit, current rectifying and wave filtering circuit and electronic temp meter are connected in parallel, and current rectifying and wave filtering circuit is connected 7805 mu balanced circuits with in the connecting line of electronic temp meter, and the 7805 mu balanced circuit other ends connect power supply.
Described resistive-capacitive voltage divider circuit is made up of divider resistance R1 and R2 and derided capacitors C1 and C2; R1 and R2 connects, C1 and C2 connects; Two series circuits are connected in parallel to each other and external input voltage, simultaneously in parallel separately the and external output voltage of R2 and C2.
Described current rectifying and wave filtering circuit adopts single phase full wave bridge rectifying; Full-wave bridge rectifier circuit is primarily of integrated commutation diode, filter capacitor C
0, pull-up resistor R
0composition; Integrated commutation diode input end inputs as bridge rectifier circuit, integrated commutation diode output terminal and filter capacitor C
0, pull-up resistor R
0parallel connection, as bridge rectifier circuit output terminal.
Described integrated commutation diode adopts 1N4007, surge forward current 30A, limit VRM >=50V, the highest reverse withstand voltage 1000V.
Described tester is that temperature measuring equipment is accessed mutual-inductor tester through insulated conductor, in parallel with standard potential transformer secondary terminals, can read on-the-spot real-time temperature while the ratio difference of carrying out site test reading mutual inductor and phase differential; The concrete mode of connection is: high voltage side of transformer, standard potential transformer primary side, the parallel connection of tested voltage transformer (VT) primary side; The high-end a of standard potential transformer secondary side and low side x connects mutual-inductor tester V two ends, as supply voltage loop; Standard potential transformer secondary side low side x and tested voltage transformer secondary side low side x connects mutual-inductor tester △ V two ends, respectively as error of measurement voltage circuit; The high-end a of standard potential transformer secondary side is connected with the high-end a of tested voltage transformer secondary side.
Described tester first adopts insulated conductor access way by temperature measuring equipment parallel connection access mutual-inductor tester standard mutual inductor jack; Now, temperature measuring equipment can regard a part for mutual-inductor tester as, and namely tester is the mutual-inductor tester of band temperature measurement function; When carrying out site test, once boosting to mutual inductor, due to the hypotensive effect of mutual inductor, mutual inductor secondary produces
voltage, provides power supply by terminal in parallel with it on mutual-inductor tester, and through resistive-capacitive voltage divider circuit, current rectifying and wave filtering circuit and 7805 mu balanced circuits produce 5V voltage, complete the power supply to electronic temp meter.
The invention has the beneficial effects as follows:
The present invention can make testing crew while carrying out mutual inductor ratio error and phase error test, is read by the real-time temperature at scene, makes voltage transformer (VT) field test data science and accurate more.Meanwhile, thermal module power supply takes from mutual-inductor tester, and structure is simple, saves cost, can be widely used in electric system.
Below in conjunction with accompanying drawing and example, the present invention is further detailed explanation.
Accompanying drawing explanation
Fig. 1 is alliance figure of the present invention;
Fig. 2 is the simplified structure diagram of temperature measuring equipment of the present invention;
Fig. 3 is resistive-capacitive voltage divider circuit diagram of the present invention;
Fig. 4 is current rectifying and wave filtering circuit figure of the present invention.
Embodiment
The present invention is a kind of voltage transformer (VT) tester with temperature measurement function, specifically one temperature measuring equipment in parallel in standard potential transformer secondary circuit, can be implemented in while carrying out site error inspection and reads on-the-spot real-time temperature.
Tester of the present invention is primarily of resistive-capacitive voltage divider circuit, current rectifying and wave filtering circuit, 7805 mu balanced circuits and electronic temp meter composition, and its simplified structure diagram as shown in Figure 2.Resistive-capacitive voltage divider circuit, current rectifying and wave filtering circuit and electronic temp meter are connected in parallel, and current rectifying and wave filtering circuit is connected 7805 mu balanced circuits with in the connecting line of electronic temp meter, and the 7805 mu balanced circuit other ends connect power supply.
Described resistive-capacitive voltage divider circuit is made up of divider resistance R1 and R2 and derided capacitors C1 and C2.R1 and R2 connects, C1 and C2 connects; Two series circuits are connected in parallel to each other and external input voltage, simultaneously in parallel separately the and external output voltage of R2 and C2.
Structural drawing as shown in Figure 3.Mutual inductor secondary produces by this circuit
voltage exports 12V DC voltage by dividing potential drop, and therefore by checking, R1 size is 4k Ω, R2 size is 1k Ω; The Main Function of derided capacitors is the impact eliminating distributed capacitance, need meet R1 × C1=R2 × C2, be 1000pF, C2 size is 4000pF by checking C1 size.
Described current rectifying and wave filtering circuit adopts single phase full wave bridge rectifying, and structural drawing as shown in Figure 4.Full-wave bridge rectifier circuit is primarily of integrated commutation diode, filter capacitor C
0, pull-up resistor R
0composition.Integrated commutation diode input end inputs as bridge rectifier circuit, integrated commutation diode output terminal and filter capacitor C
0, pull-up resistor R
0parallel connection, as bridge rectifier circuit output terminal.Integrated commutation diode adopts 1N4007, surge forward current 30A, limit VRM>=50V, the highest reverse withstand voltage 1000V, and have larger surge forward current and oppositely withstand voltage and with low cost, it is 0.9V that this rectifier bridge exports average voltage level
2be about 10.8V, ensure that 7805 mu balanced circuits can comparatively good berth; Capacitor C
0act as smothing filtering, its parameter is 1000pF; Pull-up resistor R
0owing to needing to connect load 7805 in actual use, therefore can not connect.
System wiring figure of the present invention as shown in Figure 1, temperature measuring equipment accesses mutual-inductor tester through insulated conductor, in parallel with standard potential transformer secondary terminals, on-the-spot real-time temperature can be read while the ratio difference of carrying out site test reading mutual inductor and phase differential.The concrete mode of connection is: high voltage side of transformer, standard potential transformer primary side, the parallel connection of tested voltage transformer (VT) primary side; The high-end a of standard potential transformer secondary side and low side x connects mutual-inductor tester V two ends, as supply voltage loop; Standard potential transformer secondary side low side x and tested voltage transformer secondary side low side x connects mutual-inductor tester △ V two ends, respectively as error of measurement voltage circuit; The high-end a of standard potential transformer secondary side is connected with the high-end a of tested voltage transformer secondary side.
During concrete enforcement, shown in Fig. 1, Fig. 1 is alliance figure of the present invention, for electronegative potential measuring error.
First adopt insulated conductor access way by temperature measuring equipment parallel connection access mutual-inductor tester standard mutual inductor jack.Now, temperature measuring equipment can regard a part for mutual-inductor tester as, and namely tester is the mutual-inductor tester of band temperature measurement function.When carrying out site test, once boosting to mutual inductor, due to the hypotensive effect of mutual inductor, mutual inductor secondary produces
voltage, provides power supply by terminal in parallel with it on mutual-inductor tester, and through resistive-capacitive voltage divider circuit, current rectifying and wave filtering circuit and 7805 mu balanced circuits produce 5V voltage, complete the power supply to electronic temp meter.
Claims (6)
1. the voltage transformer (VT) tester with temperature measurement function, is characterized in that: comprise resistive-capacitive voltage divider circuit, current rectifying and wave filtering circuit, 7805 mu balanced circuits and electronic temp meter; Resistive-capacitive voltage divider circuit, current rectifying and wave filtering circuit and electronic temp meter are connected in parallel, and current rectifying and wave filtering circuit is connected 7805 mu balanced circuits with in the connecting line of electronic temp meter, and the 7805 mu balanced circuit other ends connect power supply.
2. a kind of voltage transformer (VT) tester with temperature measurement function according to claim 1, is characterized in that: described resistive-capacitive voltage divider circuit is made up of divider resistance R1 and R2 and derided capacitors C1 and C2; R1 and R2 connects, C1 and C2 connects; Two series circuits are connected in parallel to each other and external input voltage, simultaneously in parallel separately the and external output voltage of R2 and C2.
3. a kind of voltage transformer (VT) tester with temperature measurement function according to claim 1, is characterized in that: described current rectifying and wave filtering circuit adopts single phase full wave bridge rectifying; Full-wave bridge rectifier circuit is primarily of integrated commutation diode, filter capacitor C
0, pull-up resistor R
0composition; Integrated commutation diode input end inputs as bridge rectifier circuit, integrated commutation diode output terminal and filter capacitor C
0, pull-up resistor R
0parallel connection, as bridge rectifier circuit output terminal.
4. a kind of voltage transformer (VT) tester with temperature measurement function according to claim 3, is characterized in that: described integrated commutation diode adopts 1N4007, surge forward current 30A, limit VRM >=50V, the highest reverse withstand voltage 1000V.
5. a kind of voltage transformer (VT) tester with temperature measurement function according to claim 1, it is characterized in that: described tester is that temperature measuring equipment is accessed mutual-inductor tester through insulated conductor, in parallel with standard potential transformer secondary terminals, on-the-spot real-time temperature can be read while the ratio difference of carrying out site test reading mutual inductor and phase differential; The concrete mode of connection is: high voltage side of transformer, standard potential transformer primary side, the parallel connection of tested voltage transformer (VT) primary side; The high-end a of standard potential transformer secondary side and low side x connects mutual-inductor tester V two ends, as supply voltage loop; Standard potential transformer secondary side low side x and tested voltage transformer secondary side low side x connects mutual-inductor tester △ V two ends, respectively as error of measurement voltage circuit; The high-end a of standard potential transformer secondary side is connected with the high-end a of tested voltage transformer secondary side.
6. a kind of voltage transformer (VT) tester with temperature measurement function according to claim 1, is characterized in that: described tester first adopts insulated conductor access way by temperature measuring equipment parallel connection access mutual-inductor tester standard mutual inductor jack; Now, temperature measuring equipment can regard a part for mutual-inductor tester as, and namely tester is the mutual-inductor tester of band temperature measurement function; When carrying out site test, once boosting to mutual inductor, due to the hypotensive effect of mutual inductor, mutual inductor secondary produces
voltage, provides power supply by terminal in parallel with it on mutual-inductor tester, and through resistive-capacitive voltage divider circuit, current rectifying and wave filtering circuit and 7805 mu balanced circuits produce 5V voltage, complete the power supply to electronic temp meter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510590648.3A CN105182269B (en) | 2015-09-16 | 2015-09-16 | A kind of voltage transformer tester with temperature measurement function |
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|---|---|---|---|
| CN201510590648.3A CN105182269B (en) | 2015-09-16 | 2015-09-16 | A kind of voltage transformer tester with temperature measurement function |
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| CN105182269A true CN105182269A (en) | 2015-12-23 |
| CN105182269B CN105182269B (en) | 2018-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108037475A (en) * | 2017-11-15 | 2018-05-15 | 全球能源互联网研究院有限公司 | A kind of capacitance type potential transformer harmonic propagation characteristic test system |
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| CN108037475B (en) * | 2017-11-15 | 2022-04-29 | 全球能源互联网研究院有限公司 | Harmonic transfer characteristic test system for capacitor voltage transformer |
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| CN105182269B (en) | 2018-04-06 |
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