CN210805399U - Demagnetization circuit of power transformer - Google Patents
Demagnetization circuit of power transformer Download PDFInfo
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- CN210805399U CN210805399U CN201922238161.5U CN201922238161U CN210805399U CN 210805399 U CN210805399 U CN 210805399U CN 201922238161 U CN201922238161 U CN 201922238161U CN 210805399 U CN210805399 U CN 210805399U
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Abstract
The utility model discloses a power transformer demagnetization circuit aims at providing a convenient quick power transformer demagnetization circuit of demagnetization. The air switch with overcurrent protection, the current detection relay, the stepping motor controller module, the AC contactor, the control circuit, the three-phase linkage voltage regulator, the output wiring terminal and the voltage regulation stepping motor are arranged on the stepping motor; the input end of the air switch is connected with the input wiring terminal of the alternating current power supply, the output end of the air switch is connected with the input end of the alternating current contactor, and the output end of the alternating current contactor is connected with the input end of the three-phase linkage voltage regulator; the current detection relay is connected to a connecting circuit of the air switch and the alternating current contactor; the stepping motor controller module is connected to the output end of the air switch; the control circuit is connected to the output end of the air switch; and the control signal output end of the stepping motor controller module is connected with the voltage-regulating stepping motor.
Description
Technical Field
The utility model belongs to the technical field of the technique and specifically relates to a power transformer demagnetization circuit is related to.
Background
The large-scale power transformer is one of the expensive devices in the power system, so a relay protection device with various principles is configured, and meanwhile, in order to find the defects of the large-scale power transformer in time, the large-scale power transformer needs to be inspected, overhauled and tested in various aspects at regular intervals. The overhaul test of large power transformer is the most common important means for finding the defects of transformer in advance at present.
The magnetic flux density is large when a large power transformer is designed, and the saturation value is easy to approach. When the iron core has a small amount of residual magnetism, the transformer can trip the protection action of the transformer due to the saturation of the iron core during power transmission, so that the power transmission fails and is delayed. Especially, in a high-power direct-current project, the huge electric energy of a power plant cannot be sent out, meanwhile, the electric power of a power grid is insufficient, the safe operation of the power grid is influenced, and meanwhile, immeasurable loss is brought to the lives and properties of people. In order to prevent such an accident event, the transformer needs to be demagnetized.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art existence, provide a can realize safe power transformer demagnetization circuit who demagnetizes fast of transformer.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
a degaussing circuit of a power transformer comprises an alternating current power supply input wiring terminal, an air switch with overcurrent protection, a current detection relay, a stepping motor controller module, an alternating current contactor, a control circuit, a three-phase linkage voltage regulator, an output wiring terminal and a voltage regulating stepping motor; the input end of the air switch is connected with the input wiring terminal of the alternating current power supply, the output end of the air switch is connected with the input end of the alternating current contactor, and the output end of the alternating current contactor is connected with the input end of the three-phase linkage voltage regulator; the current detection relay is connected to a connecting circuit of the air switch and the alternating current contactor; the stepping motor controller module is connected to the output end of the air switch; the control circuit is connected to the output end of the air switch; the control signal output end of the stepping motor controller module is connected with the voltage-regulating stepping motor; the voltage regulating stepping motor is used for improving the output voltage of the three-phase linkage voltage regulator.
Preferably, the input voltage of the input terminal of the alternating current power supply is 50Hz and 380V.
Preferably, the air switch is in the DZ47 series.
Preferably, the current detection relay is an electromagnetic current relay.
Preferably, the ac contactor is an electromagnetic contactor.
Compared with the prior art, the utility model has the advantages of as follows:
the utility model discloses can carry out the demagnetization fast for the transformer to prevent the emergence of electric power system accident incident, through eliminating transformer remanence, improve the security and the reliability of power supply.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of the present invention.
Fig. 2 is a circuit schematic of a stepper motor controller module.
In the figure: the device comprises an alternating current power supply input wiring terminal 1, an air switch 2 with overcurrent protection, a current detection relay 3, a stepping motor controller module 4, an alternating current contactor 5, a control circuit 6, a three-phase linkage voltage regulator 7, an output wiring terminal 8, a voltage regulating stepping motor 9 and a three-phase linkage voltage regulating connecting rod 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention. In the following description, for the sake of clarity of illustrating the structure and operation of the present invention, reference will be made to the accompanying drawings by means of directional terms, but the terms "front", "rear", "left", "right", "up", "down", etc. should be construed as convenient terms and not as limitative terms.
The degaussing circuit of the power transformer shown in fig. 1 comprises an input terminal of an alternating-current power supply, an air switch with overcurrent protection, a current detection relay, a stepping motor controller module, an alternating-current contactor, a control circuit, a three-phase linkage voltage regulator, an output terminal and a voltage-regulating stepping motor; the input end of the air switch is connected with the input wiring terminal of the alternating current power supply, the output end of the air switch is connected with the input end of the alternating current contactor, and the output end of the alternating current contactor is connected with the input end of the three-phase linkage voltage regulator; the current detection relay is connected to a connecting circuit of the air switch and the alternating current contactor; the stepping motor controller module is connected to the output end of the air switch; the control circuit is connected to the output end of the air switch; the control signal output end of the stepping motor controller module is connected with the voltage-regulating stepping motor; the voltage regulating stepping motor is used for improving the output voltage of the three-phase linkage voltage regulator, and the voltage regulating stepping motor drives the three-phase linkage voltage regulator through the speed reducer.
In this embodiment, the input voltage of the input terminal of the ac power supply is 50Hz and 380V. The air switch adopts the DZ47 series. The current detection relay adopts an electromagnetic current relay. The alternating current contactor adopts an electromagnetic contactor.
The stepping motor controller module is composed of two parts, specifically: (1) a 3-way switching value input and 3-way switching value output mobile phone programming controller (RX 02T); (2) a stepping motor controller (TB 6600 modified version).
When the mobile phone programming controller is started, the mobile phone programming controller outputs a point-by-point control stepping motor to rotate forward quickly (60S is finished), then stops 60S, and then controls the stepping motor to rotate backward slowly (32 min) to reduce the voltage. The current in the transformer winding is attenuated repeatedly in the positive direction and the reverse direction continuously, the direct current flux of the transformer iron core is weakened continuously, and finally the direct current flux is close to zero.
The working process is as follows:
(1) three-phase ac voltage (50 Hz, 380V) is applied to ac power input terminal 1.
(2) A demagnetized transformer is input to the output terminal 8 of the three-phase interlocked voltage regulator 7.
(3) And turning on an air switch, and turning on a green light.
(4) Checking the output voltage of the autotransformer indicates a starting position at 0V.
(5) Checking the wiring is correct.
(6) Press button QA1 on the stepper motor controller module.
(7) When the button QA0 in the control circuit 6 is pressed, the contactor C is electrified, the contact C-0 is electrified and is self-maintained, the contact C-8 is switched, the green light is turned off, and the red light is turned on, which indicates that the preparation working state is entered.
(8) Pressing a button QA1 of the stepping motor controller module 4 outputs a control signal to control the voltage-regulating stepping motor, wherein the voltage-regulating stepping motor starts to rotate clockwise, and the output voltage is increased to 1000V line voltage after 15S; the phase voltage is 700V, after the stable operation of 300S, the voltage is reduced, the voltage reduction speed is 50V/min, after 14min, the voltage is reduced to 0V, and at the moment, the demagnetization of the transformer input by the output connecting terminal 8 is finished.
The utility model has the characteristics of as follows:
① adopts the auto-transformer to boost and demagnetize, the work efficiency of the high voltage transformer is very high.
②, the demagnetization speed is high, and the demagnetization can be finished 20min from the start after the wire is connected.
③ the device has high demagnetizing power and ideal demagnetizing effect.
④ the device is used to demagnetize by slowly dropping the voltage applied to the transformer and by continuously decreasing the power frequency AC voltage (current) to zero voltage (current), and has no current mutation during demagnetization, and no high overvoltage damage device.
The utility model discloses circuit, electronic components and controller that the well related are prior art, and technical personnel in the field can realize completely, need not proud. At the same time, the present invention also does not involve improvements to the software and methods.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. It should be understood by those skilled in the art that any modification, equivalent replacement, or improvement made to the technical solutions or parts of technical features described in the above embodiments can be included in the scope of the present invention within the spirit and principle of the present invention.
Claims (5)
1. A degaussing circuit of a power transformer comprises an alternating current power supply input wiring terminal, an air switch with overcurrent protection, a current detection relay, a stepping motor controller module, an alternating current contactor, a control circuit, a three-phase linkage voltage regulator, an output wiring terminal and a voltage regulating stepping motor; the method is characterized in that: the input end of the air switch is connected with the input wiring terminal of the alternating current power supply, the output end of the air switch is connected with the input end of the alternating current contactor, and the output end of the alternating current contactor is connected with the input end of the three-phase linkage voltage regulator; the current detection relay is connected to a connecting circuit of the air switch and the alternating current contactor; the stepping motor controller module is connected to the output end of the air switch; the control circuit is connected to the output end of the air switch; the control signal output end of the stepping motor controller module is connected with the voltage-regulating stepping motor; the voltage regulating stepping motor is used for improving the output voltage of the three-phase linkage voltage regulator.
2. The demagnetizing circuit of claim 1, wherein: the input voltage of the input terminal of the alternating current power supply is 50Hz and 380V.
3. A power transformer degaussing circuit according to claim 1 or 2, characterized in that: the air switch adopts the DZ47 series.
4. A power transformer degaussing circuit according to claim 1 or 2, characterized in that: the current detection relay adopts an electromagnetic current relay.
5. A power transformer degaussing circuit according to claim 1 or 2, characterized in that: the alternating current contactor adopts an electromagnetic contactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922238161.5U CN210805399U (en) | 2019-12-13 | 2019-12-13 | Demagnetization circuit of power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922238161.5U CN210805399U (en) | 2019-12-13 | 2019-12-13 | Demagnetization circuit of power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210805399U true CN210805399U (en) | 2020-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922238161.5U Active CN210805399U (en) | 2019-12-13 | 2019-12-13 | Demagnetization circuit of power transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210805399U (en) |
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2019
- 2019-12-13 CN CN201922238161.5U patent/CN210805399U/en active Active
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