CN211744147U - Control device for closing and cutting off no-load transformer at specified phase - Google Patents
Control device for closing and cutting off no-load transformer at specified phase Download PDFInfo
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- CN211744147U CN211744147U CN202020828719.5U CN202020828719U CN211744147U CN 211744147 U CN211744147 U CN 211744147U CN 202020828719 U CN202020828719 U CN 202020828719U CN 211744147 U CN211744147 U CN 211744147U
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Abstract
The utility model discloses a control device for closing and cutting off a no-load transformer at a specified phase, which comprises a phase selection closing and opening controller, wherein the input end of the phase selection closing and opening controller is connected with a signal acquisition sensor and a data communication unit, and the output end of the phase selection closing and opening controller is connected with a phase selection switch; the phase selection switching-on/switching-off controller comprises a signal acquisition unit, a main controller and a switching-on/switching-off triggering unit; the output end of the switching on/off trigger unit is connected with the phase selection switch, so that the residual magnetic flux direction and the magnetic flux magnitude in the transformer can be predicted, necessary conditions are provided for the point that the expected magnetic flux value of the system is basically the same as the magnetic flux direction and the residual magnetic flux in the transformer at the next time, the excitation inrush current and the overvoltage caused by the transient process when the unfavorable system phase angle of the no-load transformer is switched on can be effectively inhibited, the impact on a power grid system is reduced, and the safe switching on/off of the no-load transformer is realized.
Description
Technical Field
The utility model relates to an electric power system high voltage apparatus technical field especially relates to a control device that appointed phase place closes and amputates no-load transformer.
Background
A transformer is a common electrical device and is widely used in an electrical power system. The no-load closing is defined as: the secondary side of the transformer has no load, and the primary side winding is connected with a power supply (namely, no-load input). The transformer mainly comprises an inductance coil and a ferromagnetic material, and the nonlinearity of the excitation inductor and the magnetic flux saturation characteristic of the ferromagnetic material are adopted, so that no-load current accounts for about 1% -10% of rated current when the transformer operates in no-load mode. The transformer may have a large switching-on overcurrent at the no-load switching-on moment, the overcurrent is referred to as an excitation inrush current for short, the magnitude of the overcurrent is related to the initial phase angle of the power voltage at the switching-on moment, and often exceeds 6 times of rated current and 100 times of no-load current, if no measures are taken, the power supply quality of the whole system is affected by a direct current component and a harmonic component contained in the excitation inrush current; the electromagnetic force generated by the magnetizing inrush current is far greater than the electromotive force generated by the rated current of the transformer, so that the deformation or the looseness of a fixing device is easily caused, and the damage is brought to the normal operation of equipment. When the worst system phase is put into a no-load transformer, the generated excitation inrush current may cause the protection switch to trip in a switching-on instant, so that the transformer cannot be smoothly put into the power grid system to operate, and impact and damage to the whole power grid system and associated equipment to a certain extent are brought.
At present, a method for processing magnetizing inrush current generated when a no-load transformer is closed comprises the following steps: the method mainly improves the identification of the magnetizing inrush current and the system short-circuit fault current of the relay protection device, reduces the false operation of the protection device, and improves the success probability of the closing of the no-load transformer, but the method cannot inhibit the magnetizing inrush current generated in the closing process of the no-load transformer. Meanwhile, a series-connection switch-on resistance element is used for weakening the magnetizing inrush current generated in the switch-on process of the no-load transformer, so that the amplitude of the magnetizing inrush current is weakened to a certain extent, but the harmonic component in the magnetizing inrush current cannot be inhibited.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned defect or not enough, the utility model aims to provide a control device that appointed phase place closes and amputates no-load transformer.
In order to achieve the above purpose, the technical scheme of the utility model is that:
a control device for closing and cutting off a no-load transformer at a specified phase comprises a phase selection switch-on/switch-off controller, wherein the input end of the phase selection switch-on/switch-off controller is connected with a signal acquisition sensor and a data communication unit, and the output end of the phase selection switch-on/switch-off controller is connected with a phase selection switch; the phase selection switching-on/switching-off controller comprises a signal acquisition unit, a main controller and a switching-on/switching-off triggering unit; one end of the signal acquisition unit is connected with the signal acquisition sensor, and the other end of the signal acquisition unit is connected with the main controller; the input end of the main controller is also connected with the data communication unit, and the output end of the main controller is connected with the switching-on/off trigger unit; the output end of the switching on/off trigger unit is connected with the phase selection switch.
The signal acquisition sensor comprises a voltage sensor and a current sensor, and the voltage sensor and the current sensor are respectively connected with the voltage and the current of the power system and are used for acquiring the voltage and the current values.
The signal acquisition unit comprises a voltage acquisition unit connected with the voltage sensor and a current acquisition unit connected with the current sensor; the voltage acquisition unit and the current acquisition unit are respectively used for acquiring voltage waveforms and current waveforms.
The phase selection switch-on/switch-off controller further comprises a data recording unit and an energy storage unit, and the data recording unit and the energy storage unit are connected with the output end of the main controller.
The data communication unit is connected with the upper computer and used for converting a closing instruction into an optical signal and transmitting the optical signal to the phase selection closing and opening controller through an optical fiber.
The phase selection switch is a permanent magnet phase selection switch, and an A pole, a B pole and a C pole of the permanent magnet phase selection switch respectively correspond to the A pole, the B pole and the C pole of the transformer and are used for switching on or switching off the no-load transformer.
The switching-on and switching-off trigger unit comprises a switching-on and switching-off trigger circuit and is used for controlling the phase selection switch to work according to the instruction of the main controller.
The master controller is an SM7-A type intelligent controller; the data communication unit is YK12-E type data communicator
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a control device that appointed phase place closed and amputated no-load transformer, through the cooperation of each part, can amputate no-load transformer at appointed system current phase place, residual magnetism magnetic flux direction and magnetic flux size in the transformer can be predicted. The method provides necessary conditions for the point that the expected magnetic flux value of the system is basically the same with the magnetic flux direction and the residual magnetic flux in the transformer at the next time, and the no-load transformer is closed at the specified system voltage phase through the closing strategy set in the main controller in the phase selection and closing controller, so that the excitation inrush current and the overvoltage caused by the transient process when the no-load transformer is switched in at the unfavorable system phase angle can be effectively inhibited, the impact on a power grid system is reduced, and the safe closing of the no-load transformer is realized.
Drawings
Fig. 1 is a schematic diagram of the transformer closing control strategy of the present invention;
fig. 2 is a block diagram of the structure of the control device for closing and cutting off the no-load transformer with the designated phase according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the drawings, and it should be understood 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 creative work belong to the protection scope of the present invention.
As shown in fig. 1, the utility model provides a control device for closing and cutting off no-load transformer with assigned phase, which comprises a phase selection switch controller 1, wherein the input end of the phase selection switch controller 1 is connected with a signal acquisition sensor 2 and a data communication unit 3, and the output end of the phase selection switch controller 1 is connected with a phase selection switch 4; the phase selection switching-on/switching-off controller 1 comprises a signal acquisition unit 11, a main controller 12 and a switching-on/switching-off triggering unit 14; one end of the signal acquisition unit 11 is connected with the signal acquisition sensor 2, and the other end is connected with the main controller 12; the input end of the main controller 12 is also connected with the data communication unit 3, and the output end is connected with the switching on/off trigger unit 14; the output end of the switching on/off trigger unit 14 is connected with the phase selection switch 4.
Specifically, the signal collecting sensor 2 includes a voltage sensor 21 and a current sensor 22, and the voltage sensor 21 and the current sensor 22 are respectively connected to the voltage and the current of the power system for collecting the voltage and the current values.
The signal acquisition unit 11 comprises a voltage acquisition unit 111 connected with the voltage sensor 21 and a current acquisition unit 112 connected with the current sensor 22; the voltage acquisition unit 111 and the current acquisition unit 112 are used for acquiring voltage and current waveforms, respectively.
Further, the phase selection switch-on/switch-off controller 1 and the phase selection switch-on/switch-off controller 1 further include a data recording unit 13 and an energy storage unit 15, where the data recording unit 13 and the energy storage unit 15 are connected to an output end of the main controller 12.
The data communication unit 3 is connected with an upper computer, and is used for converting a closing instruction into an optical signal and transmitting the optical signal to the phase selection switching-on/off controller 1 through an optical fiber.
The phase selection switch 4 is a permanent magnet phase selection switch, and an A pole, a B pole and a C pole of the permanent magnet phase selection switch respectively correspond to the A pole, the B pole and the C pole of the transformer and are used for closing or cutting off the no-load transformer.
The switching-on/off trigger unit 14 comprises a switching-on/off trigger circuit, and is used for controlling the phase selection switch 4 to work according to the instruction of the main controller 12.
Illustratively, the master 12 is a SM7-A type intelligent controller; the data communication unit 3 is a YK12-E type data communicator.
The utility model discloses a working process and principle do:
the phase selection switching controller 1 obtains a system voltage waveform through the voltage acquisition unit 111 before the permanent magnet phase selection switch is switched on, analyzes and calculates a zero point of the voltage waveform, the data communication unit 3 converts a switching-on instruction into an optical signal and transmits the optical signal to the phase selection switching controller 1 through an optical fiber, and the phase selection switching controller 1 controls the permanent magnet phase selection switch to switch on and off a no-load transformer through the switching-on and switching-off trigger circuit at a specified time after receiving the switching-on optical signal;
the phase selection switch controller 1 obtains a system current waveform through the current acquisition unit 112 after the permanent magnet phase selection switch is closed, analyzes and calculates a zero point of the current waveform, the data communication unit 3 converts a switch-off instruction into an optical signal and transmits the optical signal to the phase selection switch controller 1 through an optical fiber, and the phase selection switch controller 1 controls the permanent magnet phase selection switch to cut off a no-load transformer at a specified time after receiving the switch-off optical signal. The switching-on inrush current and the overvoltage caused by the transient process when the no-load transformer is switched in at the unfavorable system phase angle can be effectively restrained, the impact on a power grid system is reduced, and the safe switching-on and switching-off of the no-load transformer are realized.
As shown in fig. 2, a system voltage signal is sent to the phase selection switching controller 1 through the voltage sensor 21, an electric signal is converted into a digital signal through AD conversion in the phase selection switching controller 1, and the main controller 12 analyzes and calculates the time when the zero degree phase angle of the system voltage occurs. When the no-load transformer needs to be closed, after an closing instruction is sent, firstly, the closing instruction is converted into an optical signal through the data communication unit 3 and is transmitted to the phase selection switching controller 1, at this time, the processing process of the phase selection switching controller 1 is as shown in fig. 1, a time T1 in fig. 1 indicates that the phase selection switching controller receives the closing instruction, the main control program calculates a time period T1 from the time when the closing instruction is received to a subsequent zero crossing point of the system voltage, and reaches a time T2 in fig. 1, that is, a zero point of the system voltage after the closing instruction is received, the main control program delays the time T2 according to a set closing strategy, and the closing trigger circuit controls the energy storage capacitor of the energy storage unit 14 to discharge outwards to enable the pole a and the pole B of the permanent magnet phase selection switch to start to be closed, that is, the time T3 in fig:
the switching-on time of the A pole and the B pole of the permanent magnet phase selection switch is as follows: after T3, the permanent magnet phase selection switch A pole and B pole main fracture are closed at a specified system voltage phase angle, namely at the time T4 in FIG. 1: and the A pole and the B pole of the no-load transformer are connected to the system at the moment. In the time of T2 in fig. 1, the time of T2 'is delayed according to a set closing strategy, the energy storage capacitor is controlled by a closing trigger circuit to discharge to the outside so that the C pole of the permanent magnet phase selection switch starts to be closed, and the main fracture of the C pole of the permanent magnet phase selection switch is closed after the time of T3', so that the C pole of the no-load transformer is connected into a power grid system, and the safe closing of the no-load transformer at a specified phase is completed.
The brake opening process: when the transformer runs in a power grid system, as shown in fig. 2, a system current signal is sent into the phase selection switch-on/switch-off controller through the current sensor, an electric signal is converted into a digital signal in the controller through AD conversion, and the main controller 12 analyzes and calculates the time when a zero-degree phase angle of the system current occurs. When a no-load transformer needs to be cut off, after a switching-off electric instruction is sent out, the switching-off electric instruction is firstly converted into an optical signal through the data communication unit 3 and is transmitted to the phase selection switching-on and switching-off controller, at the moment, the processing process of the phase selection switching-on and switching-off controller 1 is similar to that shown in figure 1, firstly, the phase selection switching-on and switching-off control is carried out, the switching-off instruction is received by the phase selection switching-on and switching-off controller 1, the master controller 12 calculates a time period from the time when the switching-off instruction is received to the subsequent zero crossing point of the system current, the master controller 12 delays the corresponding time period, at the subsequent zero crossing point of the system current, the master control program delays the appointed time according to the set cutting strategy, the energy storage capacitor is controlled by the switching-off trigger circuit to discharge. From the calculated current zero crossing point moment, the main controller 12 delays for appointed time according to a set cut-off strategy, the energy storage capacitor is controlled by the brake-off trigger circuit to discharge outwards, so that the pole C of the permanent magnet phase selection switch B starts to be switched off, the pole C of the permanent magnet phase selection switch B and the pole C main fracture are switched on and off at an appointed system current phase angle after a certain time, and the no-load transformer is cut off from a power grid system according to the set cut-off strategy, so that preparation is made for the next cut-off strategy.
As shown in fig. 2, the upper computer operation interface adopts a C # language starting system, in which a data command is set to be transmitted to the data communication unit through the upper computer in order to set a delay time in the closing strategy, the data communication unit converts the data into an optical signal and transmits the optical signal to the phase selection switching-on/off controller, and the main control program stores the received data in the data recording unit. The method can be called by the main control program when executing specific operation.
It should be noted that, in the present invention, all the programs used are conventional programs in electronic circuit control, and need not be rewritten by those skilled in the art.
It should be apparent to those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and therefore, the modifications and changes that can be made by those skilled in the art to some parts of the present invention still embody the principles of the present invention, and the objects of the present invention are achieved, all falling within the scope of the present invention.
Claims (8)
1. A control device for closing and cutting off a no-load transformer at a specified phase is characterized by comprising a phase selection switch-on and switch-off controller (1), wherein the input end of the phase selection switch-on and switch-off controller (1) is connected with a signal acquisition sensor (2) and a data communication unit (3), and the output end of the phase selection switch-on and switch-off controller (1) is connected with a phase selection switch (4); the phase selection switching-on/off controller (1) comprises a signal acquisition unit (11), a main controller (12) and a switching-on/off trigger unit (14); one end of the signal acquisition unit (11) is connected with the signal acquisition sensor (2), and the other end is connected with the main controller (12); the input end of the main controller (12) is also connected with the data communication unit (3), and the output end of the main controller is connected with the switching-on/off trigger unit (14); the output end of the switching-on/off trigger unit (14) is connected with the phase selection switch (4).
2. The control device for closing and cutting off a no-load transformer with specified phases according to claim 1, characterized in that the signal acquisition sensor (2) comprises a voltage sensor (21) and a current sensor (22), and the voltage sensor (21) and the current sensor (22) are respectively connected with the voltage and the current of the power system for acquiring the voltage and the current values.
3. The control device for closing and cutting off a no-load transformer with specified phase according to claim 2, characterized in that the signal acquisition unit (11) comprises a voltage acquisition unit (111) connected with a voltage sensor (21) and a current acquisition unit (112) connected with a current sensor (22); the voltage acquisition unit (111) and the current acquisition unit (112) are used for acquiring voltage and current waveforms respectively.
4. The control device for closing and cutting off the no-load transformer with assigned phases according to claim 1, wherein the phase selection closing and opening controller (1) further comprises a data recording unit (13) and an energy storage unit (15), and the data recording unit (13) and the energy storage unit (15) are connected with the output end of the main controller (12).
5. The control device for closing and cutting off the unloaded transformer with assigned phases according to claim 1, wherein the data communication unit (3) is connected with an upper computer, and is used for converting a closing command into an optical signal and transmitting the optical signal to the phase selection closing and opening controller (1) through an optical fiber.
6. The control device for closing and cutting off the unloaded transformer with assigned phases according to claim 1, wherein the phase selection switch (4) is a permanent magnet phase selection switch, and the pole A, the pole B and the pole C of the permanent magnet phase selection switch respectively correspond to the pole A, the pole B and the pole C of the unloaded transformer for closing or cutting off the unloaded transformer.
7. The control device for switching on and off the no-load transformer with specified phases according to claim 1, wherein the switching-on/off trigger unit (14) comprises a switching-on/off trigger circuit for controlling the operation of the phase selection switch (4) according to the instruction of the main controller (12).
8. Control device for closing and cutting off a no-load transformer with assigned phases according to claim 1, characterized in that said master controller (12) is an intelligent controller of the SM7-a type; the data communication unit (3) is a YK12-E type data communicator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020828719.5U CN211744147U (en) | 2020-05-18 | 2020-05-18 | Control device for closing and cutting off no-load transformer at specified phase |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020828719.5U CN211744147U (en) | 2020-05-18 | 2020-05-18 | Control device for closing and cutting off no-load transformer at specified phase |
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| CN211744147U true CN211744147U (en) | 2020-10-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991606A (en) * | 2021-10-18 | 2022-01-28 | 国电南瑞科技股份有限公司 | Method and device for preventing excitation inrush current misoperation of transformer |
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2020
- 2020-05-18 CN CN202020828719.5U patent/CN211744147U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113991606A (en) * | 2021-10-18 | 2022-01-28 | 国电南瑞科技股份有限公司 | Method and device for preventing excitation inrush current misoperation of transformer |
| CN113991606B (en) * | 2021-10-18 | 2024-01-02 | 国电南瑞科技股份有限公司 | Excitation surge current misoperation prevention method and device for transformer |
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