CN103454553A - Secondary side phase checking device of voltage transformer - Google Patents
Secondary side phase checking device of voltage transformer Download PDFInfo
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- CN103454553A CN103454553A CN2013103731945A CN201310373194A CN103454553A CN 103454553 A CN103454553 A CN 103454553A CN 2013103731945 A CN2013103731945 A CN 2013103731945A CN 201310373194 A CN201310373194 A CN 201310373194A CN 103454553 A CN103454553 A CN 103454553A
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Abstract
The invention discloses a secondary side phase checking device of a voltage transformer, and the secondary side phase checking device of the voltage transformer is suitable for an electrical power system. The secondary side phase checking device of the voltage transformer comprises a first set of three-phase binding posts A, B and C, a second set of three-phase binding posts A1, B1 and C1, three digital voltmeters and three digital phase meters. The secondary side phase checking device of the voltage transformer has the advantages of being quite convenient to use, capable of being operated by one person in the process of field operation and checking an amplitude value and a phase between every two phase voltages on the secondary side of the voltage transformer, accurate in value display, and capable of saving the work time and improving the work efficiency.
Description
Technical field
The present invention relates to power industry system relay protection professional skill field; The secondary side phase checking device that particularly relates to a kind of voltage transformer (VT).
Background technology
The voltage transformer (VT) that the power industry system is used, be actually the transformer of a ribbon core.It mainly is comprised of first and second coil, iron core and insulation course.When on a winding, applying a voltage U 1, just produce a magnetic flux φ in iron core, according to the law of electromagnetic induction, in Secondary Winding, just produce a secondary voltage U2.Change once or the number of turn of Secondary Winding, can produce different primary side voltage and secondary side voltage ratio, this just can form the voltage transformer (VT) of different proportion.Voltage transformer (VT) converts the high voltage of primary side to the low-voltage of secondary side in proportion, i.e. 100V, and the voltage transformer (VT) primary side is connected in primary system, and voltage transformer secondary side connects in measurement instrument, relay protection system.Voltage transformer (VT) is mainly electromagnetic type (capacitance type potential transformer is widely used), non electromagnetic separately arranged, as electronic type, photo-electric etc.The ruuning situation of voltage transformer (VT), be equivalent to the transformer that secondary side is opened a way, and its load is the measurement instrument that impedance is larger.The effect of voltage transformer (VT) is, by the high voltage of primary side in proportion relation transformation become the secondary side voltage of 100V or more low-grade standard, for protection, metering and metering device.Simultaneously, use voltage transformer (VT), can be by the high voltage of primary side and electrician's isolation.Although voltage transformer (VT) is also the equipment according to electromagnetic induction principle work, its electromagnetic structure relation is compared just in time contrary with current transformer.The voltage transformer secondary side loop is the high impedance loop, and the size of secondary side current is determined by the impedance in loop.When the secondary side loaded impedance reduces, secondary side current increases, and makes the electric current of primary side automatically increase one-component and meets the electromagnetic balance relation between first and second side.Can say, voltage transformer (VT) is a special transformer that is defined structure and type of service.The mode of connection of voltage transformer (VT) is a lot, common are following several: (1) measures the mode of connection of a certain phase-to-ground voltage or voltage between phases with a single-phase potential transformer.(2) be connected into incomplete star by two single-phase transformers, also claim the V-V wiring, be used for measuring each voltage between phases, but can not measure the phase line-to-earth voltage, be widely used in the following isolated neutral of 20KV or in the electrical network of grounding through arc.(3) form YN with three single-phase three winding voltage mutual inductors, yn, d0 or YN, y, the connection type of d0, be widely used in 3 ~ 220KV system, and its Secondary Winding is for measuring voltage between phases and phase-to-ground voltage, auxiliary Secondary Winding is connected into open-delta, for incoming transport line insulation supervisory instrument and relay.Replace above-mentioned three wiring that single-phase three winding voltage mutual inductors form with a three-phase five-pole voltage transformer, general only for 3 ~ 15KV electric system.(4) capacitance type potential transformer connection type.At isolated neutral or in the system of grounding through arc, in order to measure phase-to-ground voltage, winding of voltage transformer (VT) must be connected into the mode of star ground connection.In 3 ~ 60KV electrical network, usually adopt three single-phase three winding voltage mutual inductors, or the connection type of a three-phase five-pole voltage transformer.Must be pointed out, can not do this measurement with the three-phase three-limb voltage transformer (VT).When the system single phase ground fault, in the three-phase of mutual inductor, will there is zero-sequence current to pass through, generation equal and opposite in direction, the zero sequence magnetic flux that phase place is identical.In the three-phase three-limb mutual inductor, the zero sequence magnetic flux, air gap that can only be very large by magnetic resistance and iron shell form closed magnetic circuit, and zero-sequence current is very large, makes the mutual inductor winding overheated, even damage equipment.And, in three-phase five-pole voltage transformer, the zero sequence magnetic flux can form loop by the iron core of both sides, magnetic resistance is less, so the zero-sequence current value is little, to mutual inductor, can not cause damage.The reason that the Current Transformer Secondary side can not be opened a way is, the primary current of current transformer is very large, if secondary open circuit occurs and just is equivalent to the electric current of primary side directly is added to secondary side, light cause burning of mutual inductor, make the reometer read untrue, heavy cause and burn electric equipment and threaten personal safety.
At present, there is no special-purpose measurement mechanism during on-the-spot voltage transformer secondary side nuclear phase, just with digimer, carry out the measurement of every phase, check the amplitude between every two phase voltages, judge that whether Secondary Connections of PTs is correct, can not be measured the phase differential between every two phase voltages, and need two people's compounding practices to complete, inefficiency.
Summary of the invention
Technical matters to be solved by this invention is, provides a kind of and can check the secondary side phase checking device that amplitude between every two phase voltages and phase place are saved the voltage transformer (VT) in man-hour.
The technical solution adopted in the present invention is that a kind of voltage transformer secondary side phase checking device, is characterized in that, comprises first group of three-phase binding post ABC, second group of three-phase binding post A1B1C1, three digital voltmeters and three digital phase meters;
The input end of the first digital voltmeter and the first digital phase meter is connected in parallel respectively, the join end of parallel connection input of terminal and the first digital voltmeter and the first digital phase meter of described first group of three-phase electricity A is electrically connected to, and described second group of three-phase electricity A1 other end that terminal inputs with the parallel connection of the first digital voltmeter and the first digital phase meter that joins is electrically connected to;
The input end of the second digital voltmeter and the second digital phase meter is connected in parallel respectively, the join end of parallel connection input of terminal and the second digital voltmeter and the second digital phase meter of described first group of three-phase electricity B is electrically connected to, and described second group of three-phase electricity B1 other end that terminal inputs with the parallel connection of the second digital voltmeter and the second digital phase meter that joins is electrically connected to;
The input end of the 3rd digital voltmeter and the 3rd digital phase meter is connected in parallel respectively, the join end of parallel connection input of terminal and the 3rd digital voltmeter and the 3rd digital phase meter of described first group of three-phase electricity C is electrically connected to, and described second group of three-phase electricity C1 other end that terminal inputs with the parallel connection of the 3rd digital voltmeter and the 3rd digital phase meter that joins is electrically connected to.
The invention has the beneficial effects as follows, easy to use, can carry out the one man operation during site work, can check amplitude and phase place between every two phase voltages, numerical value shows accurately saves man-hour, increases work efficiency.
The accompanying drawing explanation
Fig. 1 is that voltage transformer secondary side phase checking device of the present invention forms structural representation.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
As shown in Figure 1, voltage transformer secondary side phase checking device of the present invention, comprise, first group of three-phase binding post ABC, second group of three-phase binding post A1B1C1, three digital voltmeters and three digital phase meters;
The input end of the first digital voltmeter and the first digital phase meter is connected in parallel respectively, the join end of parallel connection input of terminal and the first digital voltmeter and the first digital phase meter of described first group of three-phase electricity A is electrically connected to, and described second group of three-phase electricity A1 other end that terminal inputs with the parallel connection of the first digital voltmeter and the first digital phase meter that joins is electrically connected to.
The input end of the second digital voltmeter and the second digital phase meter is connected in parallel respectively, the join end of parallel connection input of terminal and the second digital voltmeter and the second digital phase meter of described first group of three-phase electricity B is electrically connected to, and described second group of three-phase electricity B1 other end that terminal inputs with the parallel connection of the second digital voltmeter and the second digital phase meter that joins is electrically connected to.
The input end of the 3rd digital voltmeter and the 3rd digital phase meter is connected in parallel respectively, the join end of parallel connection input of terminal and the 3rd digital voltmeter and the 3rd digital phase meter of described first group of three-phase electricity C is electrically connected to, and described second group of three-phase electricity C1 other end that terminal inputs with the parallel connection of the 3rd digital voltmeter and the 3rd digital phase meter that joins is electrically connected to.
The present invention adopts digital watch to show by the numerical value of the amplitude of core alternating current and phase differential, accurately directly perceived, two groups of ABC three-phase binding posts are installed in the device both sides, use and connect wire by test, access respectively two groups of voltage transformer secondary sides, according to the separate wiring respectively of correspondence, two groups of every phase voltages of voltage transformer secondary side are measured, can conveniently show numerical value.Can carry out the one man operation during site work, not only can check the amplitude between every two phase voltages, can also check the phase place between every two phase voltages, numerical value shows accurately saves man-hour, increases work efficiency.
To note the correctness of polarity during measurement, the safety in order to ensure the people when contact measurement instrument and the relay, secondary windings of PT must have one point earth.Because after ground connection, when once and during the insulation damages between Secondary Winding, can prevent that instrument and relay from occurring that high voltage jeopardizes personal safety.Voltage transformer secondary side does not allow short circuit.Because the voltage transformer (VT) internal impedance is very little, if during secondary loop short circuit, there will be very large electric current, will damage secondary device and even jeopardize personal safety.The capacity that is connected on the voltage transformer secondary side load should be suitable, and the load that is connected on voltage transformer secondary side should not surpass its rated capacity, otherwise, can make the error of mutual inductor increase, be difficult to reach the correctness of measurement.
It is worthy of note; protection scope of the present invention is not limited to above-mentioned instantiation mode; according to basic fundamental design of the present invention; also available essentially identical structure; can realize purpose of the present invention; as long as those of ordinary skills are without the process creative work, the embodiment that can associate, all belong to protection scope of the present invention.
Claims (1)
1. a voltage transformer secondary side phase checking device, is characterized in that, comprises first group of three-phase binding post ABC, second group of three-phase binding post A1B1C1, three digital voltmeters and three digital phase meters;
The input end of the first digital voltmeter and the first digital phase meter is connected in parallel respectively, the join end of parallel connection input of terminal and the first digital voltmeter and the first digital phase meter of described first group of three-phase electricity A is electrically connected to, and described second group of three-phase electricity A1 other end that terminal inputs with the parallel connection of the first digital voltmeter and the first digital phase meter that joins is electrically connected to;
The input end of the second digital voltmeter and the second digital phase meter is connected in parallel respectively, the join end of parallel connection input of terminal and the second digital voltmeter and the second digital phase meter of described first group of three-phase electricity B is electrically connected to, and described second group of three-phase electricity B1 other end that terminal inputs with the parallel connection of the second digital voltmeter and the second digital phase meter that joins is electrically connected to;
The input end of the 3rd digital voltmeter and the 3rd digital phase meter is connected in parallel respectively, the join end of parallel connection input of terminal and the 3rd digital voltmeter and the 3rd digital phase meter of described first group of three-phase electricity C is electrically connected to, and described second group of three-phase electricity C1 other end that terminal inputs with the parallel connection of the 3rd digital voltmeter and the 3rd digital phase meter that joins is electrically connected to.
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|---|---|---|---|
| CN2013103731945A CN103454553A (en) | 2013-08-23 | 2013-08-23 | Secondary side phase checking device of voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103731945A CN103454553A (en) | 2013-08-23 | 2013-08-23 | Secondary side phase checking device of voltage transformer |
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| CN103454553A true CN103454553A (en) | 2013-12-18 |
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| CN2013103731945A Pending CN103454553A (en) | 2013-08-23 | 2013-08-23 | Secondary side phase checking device of voltage transformer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510714A (en) * | 2015-12-18 | 2016-04-20 | 国家电网公司 | Intelligent substation pressure transmitter secondary automatic phase tester |
| CN106772194A (en) * | 2016-12-26 | 2017-05-31 | 国网山东省电力公司青岛供电公司 | A kind of voltage transformer secondary voltage nuclear-phase method, device and detection means |
| CN107329007A (en) * | 2017-06-09 | 2017-11-07 | 国网上海市电力公司 | A kind of universal secondary nuclear phase instrument for transformer station |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614771A (en) * | 2009-07-22 | 2009-12-30 | 天津市电力公司 | Detection method of digital substation PT secondary nuclear phase checking |
| CN102680807A (en) * | 2012-07-10 | 2012-09-19 | 江苏省电力公司电力科学研究院 | Optical fiber digitized remote phase-checking system and phase-checking method thereof |
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2013
- 2013-08-23 CN CN2013103731945A patent/CN103454553A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101614771A (en) * | 2009-07-22 | 2009-12-30 | 天津市电力公司 | Detection method of digital substation PT secondary nuclear phase checking |
| CN102680807A (en) * | 2012-07-10 | 2012-09-19 | 江苏省电力公司电力科学研究院 | Optical fiber digitized remote phase-checking system and phase-checking method thereof |
Non-Patent Citations (3)
| Title |
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| 杨建堂 等: "两台变压器并联运行用电压表、相序表、进行核相", 《中国电力教育》 * |
| 邓贻名: "电力系统核相分析与应用", 《农村电气化》 * |
| 陈辉 等: "电压互感器的二次回路核相及接线", 《科技资讯》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510714A (en) * | 2015-12-18 | 2016-04-20 | 国家电网公司 | Intelligent substation pressure transmitter secondary automatic phase tester |
| CN106772194A (en) * | 2016-12-26 | 2017-05-31 | 国网山东省电力公司青岛供电公司 | A kind of voltage transformer secondary voltage nuclear-phase method, device and detection means |
| CN107329007A (en) * | 2017-06-09 | 2017-11-07 | 国网上海市电力公司 | A kind of universal secondary nuclear phase instrument for transformer station |
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Application publication date: 20131218 |