CN212255639U - Dry-type air-core reactor turn-to-turn short circuit fault screening device - Google Patents
Dry-type air-core reactor turn-to-turn short circuit fault screening device Download PDFInfo
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- CN212255639U CN212255639U CN202021050631.1U CN202021050631U CN212255639U CN 212255639 U CN212255639 U CN 212255639U CN 202021050631 U CN202021050631 U CN 202021050631U CN 212255639 U CN212255639 U CN 212255639U
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Abstract
The invention discloses a turn-to-turn short circuit fault screening device for a dry type air reactor, which solves the problem of simply and conveniently screening the initial fault of the dry type air reactor. The three-phase dry-type air reactor testing device comprises a three-phase voltage regulator (13), a three-phase exciting transformer (10), a tested three-phase dry-type air reactor and a three-phase voltage divider, and is characterized in that an input end (12) of the three-phase exciting transformer (10) is connected to an output end (11) of the three-phase exciting transformer (10), a three-phase bus (1) is connected to the tested three-phase dry-type air reactor and the three-phase bus (1), the tested three-phase dry-type air reactor is connected with one end of an ammeter (9) after the tail end of the tested three-phase dry-type air reactor is short-circuited, and the other. The invention has simple test loop erection, small equipment quantity and low cost, and is convenient for the on-site popularization and application of the transformer substation.
Description
Technical Field
The invention relates to a dry-type air-core reactor turn-to-turn short circuit fault screening device, in particular to a dry-type air-core reactor turn-to-turn short circuit fault screening device and a screening method thereof.
Background
At present, a dry-type air-core reactor is mainly adopted for current limiting and compensation on the low-voltage side of a main transformer of a transformer substation of 110kV or more; the air reactors have faults, so that the phenomena of ignition, single-phase grounding, interphase grounding and the like are easily caused, and the safe and stable operation of the main transformer is threatened; the dry-type air-core reactor has the advantages that the initial fault, generally a turn-to-turn short circuit fault, is long in fault latency time and not easy to perceive, can be discovered only after the fault is developed to a serious defect, and brings serious threat to the safe and stable operation of a transformer substation; the existing method for detecting the turn-to-turn short circuit of the dry-type air-core reactor mainly adopts a pulse voltage method, but the pulse voltage method has the defects of large test equipment volume and complicated test wiring, and is not suitable for screening the initial fault of the dry-type air-core reactor.
Disclosure of Invention
The invention provides a screening device and a screening method for turn-to-turn short circuit faults of a dry-type air reactor, and solves the technical problem of simply and conveniently screening the initial faults of the dry-type air reactor.
The invention solves the technical problems by the following technical scheme:
the general concept of the invention is: a diagnosis device for on-site dry type air reactor turn-to-turn short circuit faults is developed, a test loop is built, voltage transformers are used for measuring voltages of the head end and the tail end of a dry type reactor, and fault phase reactors are effectively detected by calculating phase current error values, so that reference is provided for reducing the detection range by utilizing a pulse voltage method in the later period.
A turn-to-turn short circuit fault screening device for a dry type air reactor comprises a three-phase voltage regulator, a three-phase excitation transformer, a three-phase dry type air reactor to be tested and a three-phase voltage divider, wherein the three-phase voltage regulator can output three-phase voltages, the difference between the three-phase voltages is 120 degrees, the output end of the three-phase voltage regulator is connected with the input end of the three-phase excitation transformer, the output end of the three-phase excitation transformer is connected with a three-phase bus, the head end of an A-phase reactor of the three-phase dry type air reactor to be tested is connected with the A of the three-phase bus, the head end of a B-phase reactor of the three-phase dry type air reactor to be tested is connected with the B of the three-phase bus, the head end of a C-phase reactor of the three-phase dry type air reactor to be tested is connected with the C of the three-phase bus, the tail end of the A-phase reactor of the three-phase dry The short circuit is connected with one end of an ammeter, the other end of the ammeter is grounded, the head end of an A-phase voltage divider is connected with the A of a three-phase bus, the tail end of the A-phase voltage divider is grounded, the head end of a B-phase voltage divider is connected with the A of the three-phase bus, the tail end of the B-phase voltage divider is grounded, the head end of a C-phase voltage divider is connected with the C of the three-phase bus (1), and the tail end of the C-phase voltage divider is grounded.
A fault screening method of a dry-type air-core reactor turn-to-turn short circuit fault screening device is characterized by comprising the following steps:
firstly, stopping the three-phase dry type reactor to be detected on site, removing the connecting lines at the head end and the tail end of the three-phase dry type reactor, respectively measuring the resistance value of an A-phase reactor of the detected three-phase dry type air reactor, the resistance value of a B-phase reactor of the detected three-phase dry type air reactor and the resistance value of a C-phase reactor of the detected three-phase dry type air reactor by using a resistance meter, wherein the reciprocal of the three resistance values are the conductance value Ga of the A-phase reactor, the conductance value Gb of the B-phase reactor and the conductance value Gc of the C-phase reactor;
and secondly, measuring to obtain a three-phase voltage value of the three-phase bus by using a three-phase voltage divider: ua, Ub and Uc;
thirdly, boosting the three-phase excitation transformer through a three-phase voltage regulator, and stopping boosting the three-phase excitation transformer when the display voltage value of the phase A voltage divider, the display voltage value of the phase B voltage divider and the display voltage value of the phase C voltage divider all reach the rated voltage of the three-phase dry-type air-core reactor to be tested;
step four, reading a numerical value displayed on the ammeter, judging that the three-phase dry type air-core reactor to be tested is normal if the numerical value is less than 0.1A, and judging that the three-phase dry type air-core reactor to be tested is abnormal if the numerical value is greater than or equal to 0.1A, and performing the following steps;
fifthly, replacing the ammeter by using a dry type reactor neutral point voltage divider, re-performing the third step, and respectively calculating the current Ia flowing through the A-phase reactor, the current Ib flowing through the B-phase reactor and the current Ic flowing through the C-phase reactor after the voltage boosting is stopped;
sixthly, if the ratio of Ic/Ia is more than 20% and the ratio of Ia/Ib is less than 20%, judging that the C-phase reactor has the turn-to-turn short circuit phenomenon; if the ratio of Ia/Ib is more than 20% and the ratio of Ib/Ic is less than 20%, judging that the A-phase reactor has the turn-to-turn short circuit phenomenon; if the ratio of Ib/Ic is more than 20% and the ratio of Ic/Ia is less than 20%, judging that the B-phase reactor has the turn-to-turn short circuit phenomenon; if two or more than two of the ratio of Ic/Ia, the ratio of Ia/Ib and the ratio of Ib/Ic are more than 20%, judging that the two-phase or three-phase reactor has a turn-to-turn short circuit phenomenon;
and seventhly, testing the screened tested three-phase dry-type air-core reactor with the turn-to-turn short circuit by a pulse voltage method.
The invention is practical and simple, and the fault dry-type reactor can be identified only by utilizing the existing high-voltage equipment; compared with the traditional pulse voltage method, the invention has the advantages of simple test circuit set-up, small equipment quantity and low cost, and is convenient for the on-site popularization and application of the transformer substation.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of the invention for screening which phase inductor has a turn-to-turn short circuit phenomenon.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a turn-to-turn short circuit fault screening device for a dry type air reactor comprises a three-phase voltage regulator 13, a three-phase excitation transformer 10, a three-phase dry type air reactor to be tested and a three-phase voltage divider, wherein the three-phase voltage regulator 13 can output three-phase voltages, the three-phase voltages are 120 degrees different from each other, the output end of the three-phase voltage regulator 13 is connected with the input end 12 of the three-phase excitation transformer 10, the output end 11 of the three-phase excitation transformer 10 is connected with a three-phase bus 1, the head end of an A-phase reactor 2 of the three-phase dry type air reactor to be tested is connected with A of the three-phase bus 1, the head end of a B-phase reactor 3 of the three-phase dry type air reactor to be tested is connected with B of the three-phase bus 1, the head end of a C-phase reactor 4 of the three-phase dry type air reactor to be tested, The tail end of a B-phase reactor 3 of the three-phase dry-type air reactor to be detected and the tail end of a C-phase reactor 4 of the three-phase dry-type air reactor to be detected are connected with one end of an ammeter 9 after being short-circuited, the other end of the ammeter 9 is grounded, the head end of an A-phase voltage divider 6 is connected with A of a three-phase bus 1, the tail end of the A-phase voltage divider 6 is grounded, the head end of a B-phase voltage divider 7 is connected with A of the three-phase bus 1, the tail end of the B-phase voltage divider 7 is grounded, the head end of a C-phase voltage divider 8 is connected with C of the three-phase bus 1, and the tail end of the C-phase.
A fault screening method of a dry-type air-core reactor turn-to-turn short circuit fault screening device is characterized by comprising the following steps:
firstly, stopping the three-phase dry type reactor to be detected on site, removing the connecting lines at the head end and the tail end of the three-phase dry type reactor, respectively measuring the resistance value of the A-phase reactor 2 of the detected three-phase dry type air reactor, the resistance value of the B-phase reactor 3 of the detected three-phase dry type air reactor and the resistance value of the C-phase reactor 4 of the detected three-phase dry type air reactor by using a resistance meter, wherein the reciprocal of the three resistance values are the conductivity value Ga of the A-phase reactor 2, the conductivity value Gb of the B-phase reactor 3 and the conductivity value Gc of the C-phase reactor 4;
and secondly, measuring to obtain a three-phase voltage value of the three-phase bus 1 by using a three-phase voltage divider: ua, Ub and Uc;
thirdly, boosting the three-phase excitation transformer 10 through a three-phase voltage regulator 13, and stopping boosting the three-phase excitation transformer 10 when the display voltage value of the phase A voltage divider 6, the display voltage value of the phase B voltage divider 7 and the display voltage value of the phase C voltage divider 8 all reach the rated voltage of the three-phase dry air-core reactor to be tested;
step four, reading a numerical value displayed on the ammeter 9, judging that the three-phase dry-type air-core reactor to be tested is normal if the numerical value is less than 0.1A, and judging that the three-phase dry-type air-core reactor to be tested is abnormal if the numerical value is greater than or equal to 0.1A, and performing the following steps;
fifthly, replacing the ammeter 9 by using a dry type reactor neutral point voltage divider 14, re-performing the third step, and respectively calculating the current Ia flowing through the A-phase reactor 2, the current Ib flowing through the B-phase reactor 3 and the current Ic flowing through the C-phase reactor 4 after the voltage boosting is stopped;
sixthly, if the ratio of Ic/Ia is more than 20% and the ratio of Ia/Ib is less than 20%, judging that the C-phase reactor has the turn-to-turn short circuit phenomenon; if the ratio of Ia/Ib is more than 20% and the ratio of Ib/Ic is less than 20%, judging that the A-phase reactor has the turn-to-turn short circuit phenomenon; if the ratio of Ib/Ic is more than 20% and the ratio of Ic/Ia is less than 20%, judging that the B-phase reactor has the turn-to-turn short circuit phenomenon; if two or more than two of the ratio of Ic/Ia, the ratio of Ia/Ib and the ratio of Ib/Ic are more than 20%, judging that the two-phase or three-phase reactor has a turn-to-turn short circuit phenomenon;
and seventhly, testing the screened tested three-phase dry-type air-core reactor with the turn-to-turn short circuit by a pulse voltage method.
Claims (1)
1. A turn-to-turn short circuit fault screening device for a dry type air reactor comprises a three-phase voltage regulator (13), a three-phase exciting transformer (10), a three-phase dry type air reactor to be tested and a three-phase voltage divider, wherein the three-phase voltage regulator (13) can output three-phase voltages, and the three-phase voltages are 120 degrees different from each other, and is characterized in that the output end of the three-phase voltage regulator (13) is connected with the input end (12) of the three-phase exciting transformer (10), the output end (11) of the three-phase exciting transformer (10) is connected with a three-phase bus (1), the head end of an A-phase reactor (2) of the three-phase dry type air reactor to be tested is connected with A of the three-phase bus (1), the head end of a B-phase reactor (3) of the three-phase dry type air reactor to be tested is connected with B of the three-phase bus (1), the head end of a C-phase reactor (, the tail end of the A-phase reactor (2) of the three-phase dry-type air reactor to be tested, the tail end of the B-phase reactor (3) of the three-phase dry-type air reactor to be tested and the tail end of the C-phase reactor (4) of the three-phase dry-type air reactor to be tested are connected with one end of an ammeter (9) after being short-circuited, the other end of the ammeter (9) is grounded, the head end of an A-phase voltage divider (6) is connected with the A of a three-phase bus (1), the tail end of the A-phase voltage divider (6) is grounded, the head end of a B-phase voltage divider (7) is connected with the A of the three-phase bus (1), the tail end of the B-phase voltage divider (7) is grounded, the head end of a C-phase voltage divider (8) is connected with the C of the three-phase bus (1), and the tail.
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| CN111458658A (en) * | 2020-06-10 | 2020-07-28 | 国网山西省电力公司电力科学研究院 | Dry-type air-core reactor turn-to-turn short circuit fault screening device and screening method thereof |
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| CN111458658A (en) * | 2020-06-10 | 2020-07-28 | 国网山西省电力公司电力科学研究院 | Dry-type air-core reactor turn-to-turn short circuit fault screening device and screening method thereof |
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