阅读说明：本技术 干式变压器铁芯虚假接地消除方法、装置、设备及存储介质 (Method, device and equipment for eliminating false grounding of dry-type transformer iron core and storage medium ) 是由 王曹 曾力 肖云 王云龙 王俊星 杨韬 吴卓 陈晓静 于 2021-01-18 设计创作，主要内容包括：本发明公开了一种干式变压器铁芯虚假接地消除方法、装置、设备及存储介质。一种干式变压器铁芯虚假接地消除方法,包括：向干式变压器的铁芯施加电压；获取流经干式变压器的壳体的回路电流,干式变压器的壳体接地；当回路电流小于或等于预设的阈值时,停止向干式变压器的铁芯施加电压。通过向存在虚假接地现象的干式变压器的铁芯施加电压,可使电压作用在虚假接地点,使得虚假接地点发热,进而将虚假接地点烧毁,从而实现对虚假接地点的消除,有效的消除了虚假接地点,避免故障进一步扩大的风险,以及避免吊罩检查带来的工作量增加。(The invention discloses a method, a device, equipment and a storage medium for eliminating false grounding of a dry-type transformer iron core. A false grounding elimination method for a dry type transformer iron core comprises the following steps: applying a voltage to an iron core of a dry type transformer; acquiring loop current flowing through a shell of the dry type transformer, wherein the shell of the dry type transformer is grounded; and when the loop current is less than or equal to a preset threshold value, stopping applying the voltage to the iron core of the dry-type transformer. The voltage is applied to the iron core of the dry type transformer with the false grounding phenomenon, so that the voltage is applied to the false grounding point, the false grounding point is heated, and then the false grounding point is burnt, the false grounding point is eliminated effectively, the risk of further expansion of faults is avoided, and the workload brought by the detection of the suspension cover is avoided being increased.)

1. A method for eliminating false grounding of a dry type transformer iron core is characterized by comprising the following steps:

applying a voltage to an iron core of a dry type transformer;

acquiring a loop current flowing through a shell of the dry type transformer, wherein the shell of the dry type transformer is grounded;

and when the loop current is less than or equal to a preset threshold value, stopping applying the voltage to the iron core of the dry-type transformer.

2. A dry-type transformer core virtual ground elimination method as recited in claim 1, further comprising, before said applying a voltage to the core of the dry-type transformer:

and disconnecting the grounding of the iron core of the dry type transformer.

3. A dry-type transformer core virtual ground elimination method as recited in claim 1, wherein said voltage applied is in the range of 300V-600V.

4. A dry-type transformer core virtual ground elimination method as recited in claim 1, wherein said obtaining a loop current flowing through a housing of said dry-type transformer, said housing of said dry-type transformer being grounded, comprises:

a loop current of a housing of the dry-type transformer is acquired at intervals of a first time length.

5. A dry-type transformer core virtual ground elimination method as recited in claim 1, wherein said stopping application of voltage to said core of said dry-type transformer when said loop current is less than or equal to a preset threshold value comprises:

comparing the loop current with a preset threshold value;

stopping applying voltage to the iron core of the dry-type transformer if the loop current is less than or equal to the threshold;

and if the loop current is larger than the threshold value, continuing to apply the voltage to the iron core of the dry-type transformer.

6. A dry type transformer core false ground elimination method as claimed in any one of claims 1 or 5, wherein the preset threshold is 80mA-120 mA.

7. A dry-type transformer core virtual ground elimination method as recited in claim 1, further comprising, after said stopping of the application of voltage to said core of said dry-type transformer:

the acousto-optic device is driven to emit acousto-optic signals.

8. A false grounding elimination device for a dry-type transformer core is characterized by comprising:

the pressing module is used for applying voltage to the iron core of the dry type transformer;

the current acquisition module is used for acquiring loop current flowing through a shell of the dry type transformer, and the shell of the dry type transformer is grounded;

and the judging module is used for stopping applying voltage to the iron core of the dry-type transformer when the loop current is less than or equal to a preset threshold value.

9. A dry transformer core false ground elimination apparatus, the apparatus comprising:

one or more processors;

a storage device for storing one or more programs,

when executed by the one or more processors, cause the one or more processors to implement a dry-type transformer core virtual ground elimination method as recited in any of claims 1-7.

10. A storage medium containing computer-executable instructions for performing the dry transformer core false ground elimination method of any one of claims 1-7 when executed by a computer processor.

Technical Field

The embodiment of the invention relates to a transformer safety application technology, in particular to a method, a device, equipment and a storage medium for eliminating false grounding of a dry-type transformer iron core.

Background

Power transformers are one of the main devices of power plants and substations. The transformer has the functions of increasing voltage to transmit electric energy to an electricity utilization area in many aspects, and reducing the voltage to use voltages of all levels to meet the requirement of electricity utilization.

When the dry-type transformer works normally, the transformer core and the clamping piece usually need to be grounded at one point. If two or more points of grounding occur, a closed loop can be formed, and under the action of a leakage magnetic field of the transformer, a large circulation current can be generated between the two points, so that the local overheating of the transformer can be caused, the loss of an iron core is increased, the burning loss of the iron core is caused in serious conditions, and the non-stop accident of the transformer is caused. For this phenomenon, a common method is to connect a suitable resistor (generally 250-1000 Ω) in series for current limiting, or to perform a suspension inspection.

However, the problem of false grounding of the dry-type transformer is solved by adopting the above method, the former needs to measure the power of the current-limiting resistor, and the risk that the iron core down lead is disconnected from the ground due to the heating and burning of the resistor, the iron core generates a suspension potential, and the fault is further expanded; the latter eliminates false grounding defects through the inspection of the suspension cover, and needs longer time and increases maintenance cost.

Disclosure of Invention

The invention provides a method, a device, equipment and a storage medium for eliminating false grounding of a dry-type transformer iron core, which are used for quickly eliminating the false grounding problem of the dry-type transformer.

In a first aspect, an embodiment of the present invention provides a method for eliminating false grounding of an iron core of a dry-type transformer, including:

applying a voltage to an iron core of a dry type transformer;

acquiring a loop current flowing through a shell of the dry type transformer, wherein the shell of the dry type transformer is grounded;

and when the loop current is less than or equal to a preset threshold value, stopping applying the voltage to the iron core of the dry-type transformer.

Optionally, before the step of applying the voltage to the iron core of the dry-type transformer, the method further includes:

and disconnecting the grounding of the iron core of the dry type transformer.

Optionally, the voltage applied is in the range of 300V-600V.

Optionally, the obtaining a loop current flowing through a housing of the dry-type transformer, the housing of the dry-type transformer being grounded, includes:

a loop current of a housing of the dry-type transformer is acquired at intervals of a first time length.

Optionally, the stopping the voltage application to the iron core of the dry-type transformer when the loop current is less than or equal to a preset threshold includes:

comparing the loop current with a preset threshold value;

stopping applying voltage to the iron core of the dry-type transformer if the loop current is less than or equal to the threshold;

and if the loop current is larger than the threshold value, continuing to apply the voltage to the iron core of the dry-type transformer.

Optionally, the preset threshold is 80mA to 120 mA.

Optionally, after the step of stopping the application of the voltage to the iron core of the dry-type transformer, the method further includes:

the acousto-optic device is driven to emit acousto-optic signals.

In a second aspect, an embodiment of the present invention further provides a device for eliminating false grounding of an iron core of a dry-type transformer, including:

the pressing module is used for applying voltage to the iron core of the dry type transformer;

the current acquisition module is used for acquiring loop current flowing through a shell of the dry type transformer, and the shell of the dry type transformer is grounded;

and the judging module is used for stopping applying voltage to the iron core of the dry-type transformer when the loop current is less than or equal to a preset threshold value.

In a third aspect, an embodiment of the present invention further provides a device for eliminating false grounding of an iron core of a dry-type transformer, where the device includes:

one or more processors;

a storage device for storing one or more programs,

when executed by the one or more processors, cause the one or more processors to implement the dry transformer core virtual ground elimination method of the first aspect.

In a fourth aspect, embodiments of the present invention further provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform the method for eliminating false grounding of a core of a dry-type transformer according to the first aspect.

According to the invention, voltage is applied to the iron core of the dry-type transformer with the false grounding phenomenon, so that the voltage acts on the false grounding point, the false grounding point is heated, and then the false grounding point is burnt, thereby eliminating the false grounding point, effectively eliminating the false grounding point, avoiding the risk of further expansion of faults, and avoiding the increase of workload caused by the inspection of the suspension cover; by detecting the loop current flowing through the dry-type transformer and stopping continuously applying voltage to the iron core of the dry-type transformer when the loop current is less than or equal to the preset threshold value, the situation that the voltage is continuously applied to the dry-type transformer after the false grounding point is eliminated can be effectively avoided, and the iron core of the dry-type transformer is further prevented from being burnt.

Drawings

Fig. 1 is a flowchart of a method for eliminating false grounding of an iron core of a dry-type transformer according to a first embodiment of the present invention;

fig. 2 is a flowchart of a method for eliminating false grounding of an iron core of a dry-type transformer according to a second embodiment of the present invention;

fig. 3 is a structural diagram of a dry-type transformer core virtual ground elimination apparatus according to a third embodiment of the present invention;

fig. 4 is a structural diagram of a dry-type transformer core virtual ground elimination apparatus according to a fourth embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Example one

Fig. 1 is a flowchart of a method for eliminating false grounding of an iron core of a dry-type transformer according to an embodiment of the present invention, where the method is applicable to a situation where the false grounding of the iron core of the dry-type transformer is eliminated, and the method can be executed by an apparatus for eliminating false grounding of an iron core of a dry-type transformer, and specifically includes the following steps:

step 110, applying a voltage to the iron core of the dry-type transformer.

A power transformer is a stationary electrical device that is used to transform an ac voltage (current) of a certain value into another voltage (current) of the same frequency or different values. During normal operation of the power transformer, the core and the clip must be grounded with some reliability. If the grounding is not carried out, the suspension voltage of the iron core and the clamping piece to the ground can cause intermittent breakdown discharge of the iron core and the clamping piece to the ground, and the possibility of forming iron core suspension potential is eliminated after the iron core and the clamping piece are grounded at one point. However, when the iron core and the clamping member are grounded at two or more points, the uneven potential between the iron core and the clamping member forms a circular current between the grounding points, and causes a multi-point grounding heating fault of the iron core and the clamping member. The iron core of the transformer is locally overheated due to the grounding fault of the iron core, and the iron core is locally heated up when the iron core is seriously overheated, so that the iron core is melted. The local iron core that burns and melts forms the short circuit trouble between the iron core piece, makes the iron loss grow greatly, seriously influences the performance and the normal work of transformer to must change iron core silicon steel sheet and repair. The transformer core and the clip are not allowed to be grounded at multiple points, and only one point is grounded.

In the embodiment of the invention, when the false grounding of the iron core of the dry-type transformer is eliminated, the voltage is applied to the iron core of the dry-type transformer, and the shell of the dry-type transformer is grounded, so that the iron core of the dry-type transformer and the shell can be conducted through the false grounding point, a complete loop is formed with the ground, and the iron core of the dry-type transformer, the shell and the false grounding point are conducted.

And 120, acquiring a loop current flowing through the shell of the dry type transformer, wherein the shell of the dry type transformer is grounded.

In the embodiment of the invention, voltage is applied to the iron core of the dry-type transformer, the shell of the dry-type transformer is grounded, and current flows from the iron core to the shell through the virtual grounding point and finally flows to the ground through the down lead connected with the shell, so that a complete loop is formed. The loop current flowing through the shell of the dry-type transformer can be obtained by measuring the down conductor connected with the shell, for example, measuring the current of the down conductor by a clamp ammeter, or measuring the current flowing in the down conductor by an ammeter in other forms.

And step 130, stopping applying the voltage to the iron core of the dry-type transformer when the loop current is less than or equal to a preset threshold value.

In a specific implementation, when a voltage is applied to the virtual ground point between the core and the casing of the dry-type transformer, the virtual ground point generates heat, so that the connection of the virtual ground point is blown, thereby disconnecting the virtual ground point and eliminating the virtual ground point between the core and the casing. When the virtual ground point is eliminated, the current flowing between the core and the case of the dry type transformer is reduced to zero, so that the application of voltage to the core can be stopped by judging whether the virtual ground point is eliminated or not according to the magnitude of the current flowing through the core and the case of the dry type transformer.

In the embodiment, voltage is applied to the iron core of the dry-type transformer with the false grounding phenomenon, so that the voltage acts on the false grounding point, the false grounding point is heated, and then the false grounding point is burnt, the false grounding point is eliminated, the risk of further expansion of faults is avoided, and the workload increase caused by the inspection of the suspension cover is avoided; by detecting the loop current flowing through the dry-type transformer and stopping continuously applying voltage to the iron core of the dry-type transformer when the loop current is less than or equal to the preset threshold value, the situation that the voltage is continuously applied to the dry-type transformer after the false grounding point is eliminated can be effectively avoided, and the iron core of the dry-type transformer is further prevented from being burnt.

Example two

Fig. 2 is a flowchart of a method for eliminating false grounding of an iron core of a dry-type transformer according to a second embodiment of the present invention. The present embodiment is a refinement based on the first embodiment. The method specifically comprises the following steps:

and step 201, disconnecting the grounding of the iron core of the dry type transformer.

In the embodiment of the invention, when the power transformer works normally, one point of the transformer core and the clamping piece is grounded. If two or more than two points of grounding of the iron core and the clamping piece occur, a closed loop is formed between the two points, and under the action of a leakage magnetic field of the transformer, circulation current is generated between the two points to cause local overheating of the transformer, the loss of the iron core is increased when the circulation current is too large, the iron core is burned down when the circulation current is too large, and the non-stop accident of the transformer is caused. The transformer iron core and the clamp outgoing line are led out through the transformer top sleeve and then are led to the bottom of the transformer in modes of being supported by an insulating porcelain bottle or being wrapped by insulating rubber and the like, and then are connected into a main grounding grid to realize one-point grounding of the iron core.

In the concrete implementation, before the false grounding of the dry-type transformer core is eliminated, the grounding of the dry-type transformer core needs to be disconnected, so that the grounding loop of the dry-type transformer is reduced, the requirement on a power supply is lowered, the electric energy supply of the false grounding point of the dry-type transformer is ensured, and the false grounding point generates heat and is burnt.

Step 202, applying a voltage to the iron core of the dry-type transformer.

In the concrete implementation, the iron core of the dry type transformer is inserted into the power supply, so that potential voltage is generated between the iron core of the dry type transformer and the grounding point, voltage is applied to the false grounding point, current passes through the false grounding point, the false grounding point is heated, the false grounding point is burnt, and elimination of the false grounding point is achieved.

In a specific embodiment, the applied voltage is in the range of 300V to 600V.

Further, the applied voltage may be a stable dc voltage or an ac voltage, as long as it is possible to apply a voltage to the virtual ground point so that a large amount of heat generated by the virtual ground point burns the virtual ground point.

In the embodiment of the invention, the power supply can be selected by adopting a storage battery to provide direct current power supply, or connecting a dry-type transformer to commercial power to obtain alternating current power supply, or obtaining pulse power supply through a capacitor.

And 203, acquiring the loop current of the shell of the dry type transformer at intervals of a first time length.

In the embodiment of the invention, the shell of the dry-type transformer is grounded, so that a complete loop is formed among the iron core of the dry-type transformer, the shell and the false grounding point, and the false grounding point is connected into the complete loop in the elimination process, so that the false grounding point can generate enough heat to be burnt out after voltage is applied, and the elimination of the false grounding point is realized.

Step 204, comparing the loop current with a preset threshold value;

if the loop current is less than or equal to the threshold, go to step 205;

if the loop current is greater than the threshold, the process returns to step 202.

Step 205, the application of voltage to the iron core of the dry type transformer is stopped.

In the embodiment of the invention, the loop current of the loop formed by the iron core, the shell and the false grounding point of the dry-type transformer is measured, so that the elimination condition of the false grounding point can be effectively judged. In the process of burning the false grounding point, the resistance value of the false grounding point is continuously increased, which means that the grounding resistance value of the loop is increased, the loop current of the loop is reduced and finally is lower than a preset threshold range, and at this time, the false grounding point is burnt and eliminated. Ideally, the loop current should be 0 after the virtual ground is burned out, but this is not the case in practice, so in the embodiment of the present invention, a threshold is set, and the application of voltage to the core of the dry-type transformer is stopped when the loop current is less than or equal to the threshold. And the waste heat after the false grounding point is burnt can further eliminate the false grounding point.

In one specific embodiment, the predetermined threshold is 80mA-120 mA.

And step 206, driving the acousto-optic device to emit acousto-optic signals.

After the elimination of the false grounding point is completed, the acousto-optic device can be driven to emit an acousto-optic signal, which indicates that the elimination of the false grounding point of the current dry-type transformer is completed.

In an alternative embodiment, the voltage application time may be defined by timing the voltage application time and sending an alarm signal when the timing time loop current does not reach the requirement of being less than or equal to the preset threshold value. After receiving the alarm signal, the maintenance personnel further check the dry-type transformer to ensure the elimination of the false grounding point. When the false grounding condition of the dry-type transformer is faced, the false grounding point can be eliminated in advance by the dry-type transformer iron core false grounding elimination method provided by the invention, if the false grounding point is still eliminated after the pressing time is up, further inspection is carried out, so that a large amount of overhaul work caused by the false grounding point condition caused by impurities such as metal burrs, oil dirt, welding slag, iron rust and the like is reduced, and the false grounding point condition caused by the impurities such as metal burrs, oil dirt, welding slag, iron rust and the like is effectively eliminated by applying voltage.

EXAMPLE III

Fig. 3 is a structural diagram of a device for eliminating false grounding of an iron core of a dry-type transformer according to a third embodiment of the present invention. The device includes: a voltage application module 32, a current acquisition module 33, a determination module 34, a shutdown module 31 and a sound and light module 35. Wherein:

a voltage applying module 32 for applying a voltage to the core of the dry type transformer;

a current obtaining module 33, configured to obtain a loop current flowing through a housing of the dry type transformer, where the housing of the dry type transformer is grounded;

and the judging module 34 is used for stopping applying the voltage to the iron core of the dry-type transformer when the loop current is less than or equal to a preset threshold value.

Further comprising:

the disconnection module 31 disconnects the core of the dry type transformer from the ground before the voltage is applied to the core of the dry type transformer.

In the embodiment of the present invention, the applied voltage ranges from 300V to 600V.

The current acquisition module 33 includes:

and the current acquisition unit is used for acquiring the loop current of the shell of the dry-type transformer at intervals of a first time length.

The judging module 34 includes:

the comparison unit is used for comparing the loop current with a preset threshold value;

if the loop current is less than or equal to the threshold value, stopping applying the voltage to the iron core of the dry type transformer;

and if the loop current is larger than the threshold value, continuing to apply the voltage to the iron core of the dry-type transformer.

In the embodiment of the invention, the preset threshold value is 80mA-120 mA.

Further comprising:

and the acousto-optic module 35 is used for driving the acousto-optic device to emit acousto-optic signals after the voltage application to the iron core of the dry type transformer is stopped.

The device for eliminating the false grounding of the dry type transformer core provided by the embodiment of the invention can execute the method for eliminating the false grounding of the dry type transformer core provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.

Example four

Fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention. As shown in fig. 4, the electronic apparatus includes a processor 40, a memory 41, a communication module 42, an input device 43, and an output device 44; the number of the processors 40 in the electronic device may be one or more, and one processor 40 is taken as an example in fig. 4; the processor 40, the memory 41, the communication module 42, the input device 43 and the output device 44 in the electronic device may be connected by a bus or other means, and the bus connection is exemplified in fig. 4.

The memory 41 is used as a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as the modules corresponding to the dry-type transformer core virtual ground elimination method in the present embodiment (for example, the voltage application module 32, the current acquisition module 33, the judgment module 34, the circuit breaking module 31, and the sound and light module 35 in the dry-type transformer core virtual ground elimination apparatus). The processor 40 executes software programs, instructions and modules stored in the memory 41 to execute various functional applications and data processing of the electronic device, that is, to implement the above-mentioned method for eliminating false grounding of the dry-type transformer core.

The memory 41 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the electronic device, and the like. Further, the memory 41 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 41 may further include memory located remotely from processor 40, which may be connected to the electronic device through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

And the communication module 42 is used for establishing connection with the display screen and realizing data interaction with the display screen. The input device 43 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function controls of the electronic apparatus.

The electronic device provided by the embodiment of the invention can execute the method for eliminating the false grounding of the iron core of the dry-type transformer provided by any embodiment of the invention, and has corresponding functions and beneficial effects.

EXAMPLE five

An embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for eliminating false grounding of a dry-type transformer core, the method including:

applying a voltage to an iron core of a dry type transformer;

acquiring a loop current flowing through a shell of the dry type transformer, wherein the shell of the dry type transformer is grounded;

and when the loop current is less than or equal to a preset threshold value, stopping applying the voltage to the iron core of the dry-type transformer.

Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in a dry-type transformer core virtual ground elimination method provided by any embodiment of the present invention.

From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes instructions for enabling a computer electronic device (which may be a personal computer, a server, or a network electronic device) to execute the methods according to the embodiments of the present invention.

It should be noted that, in the embodiment of the device for eliminating false grounding of a dry-type transformer core, the units and modules included in the device are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.