A field acceptance method and system for the noise of a distribution transformer

Abstract

The present invention discloses a method and system for on-site acceptance of the noise of a distribution transformer. The present invention includes, for a tested distribution transformer in an off-line state, connecting a voltage regulator to the high-voltage side of the tested distribution transformer and applying an overvoltage excitation through the voltage regulator, where the overvoltage excitation is greater than the rated voltage of the tested distribution transformer; collecting the noise index of the tested distribution transformer in the state of overvoltage excitation, and judging whether the on-site acceptance of the noise of the tested distribution transformer passes according to whether the noise index of the tested distribution transformer exceeds the standard. The present invention can quickly and simply obtain the maximum value of the noise caused by the distribution transformer, and can use simple electrical equipment to obtain the maximum value of the noise of the distribution transformer to the factory boundary, sensitive points, etc., so as to realize the acceptance of the transformer noise and ensure that the distribution transformer will not cause excessive noise pollution to the public through air or building structures under different operating conditions.

Description

Technical Field

[0001] The present invention relates to the field of acoustic measurement, and particularly to a method and system for on-site acceptance of the noise of a distribution transformer. Background Art

[0002] With the increasing tension of urban land use, more and more distribution transformers are installed in residential areas, such as the basement power distribution rooms of residential buildings and the power distribution rooms in the community. For some newly built communities, the power distribution rooms are constructed by the developers themselves, and correspondingly, the transformers are selected and installed by the developers and then handed over to the power company. At present, there are frequent cases where the distribution transformers received by the power company generate noise and cause complaints. One of the reasons for this problem is that when the power company receives the distribution transformer (power distribution room), it is difficult to fully grasp the maximum noise value of the distribution transformer. Specifically, the noise and vibration of the distribution transformer are related to its operating conditions. For example, under the same operating power, the noise and vibration of the distribution transformer under the three-phase unbalanced condition are greater than those under the three-phase balanced condition. Setting various operating conditions at the operation site of the distribution transformer requires configuring a complex circuit system, which is very difficult to implement. Usually, when the power company receives it, it can only measure the radiated noise or the noise transmitted to the residents' homes when the distribution transformer is operating. The load condition of the distribution transformer is completely determined by the power consumption of the users on the load side and is difficult to control. This actual operating condition may not be the maximum noise value that the distribution transformer can emit, resulting in noise exceeding the standard after the distribution transformer is received and causing complaints. Summary of the Invention

[0003] The technical problem to be solved by the present invention: Aiming at the above problems of the prior art, a method and system for on-site acceptance of the noise of a distribution transformer are provided. The present invention aims to quickly and simply obtain the maximum value of the noise caused by the distribution transformer, and can use simple electrical equipment to obtain the maximum value of the noise of the distribution transformer to the factory boundary, sensitive points, etc., so as to realize the acceptance of the transformer noise and ensure that the distribution transformer will not cause noise exceeding the standard and disturbing the people through air or building structure under different operating conditions.

[0004] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A method for on-site acceptance of the noise of a distribution transformer, comprising:

[0006] S1, for the test distribution transformer in the off-line state, connect a voltage regulator to the high-voltage side of the test distribution transformer, and apply an over-voltage excitation through the voltage regulator, and the over-voltage excitation is greater than the rated voltage of the test distribution transformer;

[0007] S2. Collect the noise index of the test distribution transformer under overvoltage excitation, and determine whether the on-site acceptance of the noise of the test distribution transformer passes according to whether the noise index of the test distribution transformer exceeds the standard.

[0008] Optionally, the test distribution transformer in the off-line state in step S1 refers to disconnecting all the connections on the high-voltage side and the low-voltage side of the test distribution transformer.

[0009] Optionally, when disconnecting all the connections on the high-voltage side and the low-voltage side of the test distribution transformer, it also includes setting the tap-changer of the test distribution transformer to the rated voltage position.

[0010] Optionally, when applying overvoltage excitation through a voltage regulator in step S1, the overvoltage excitation is equal to 1.05 times the rated voltage of the test distribution transformer.

[0011] Optionally, before step S1, it also includes a step of, for a distribution transformer of the same model as the test distribution transformer, connecting the high-voltage side to a voltage regulator and applying overvoltage excitation through the voltage regulator in the off-line state to obtain the maximum noise value, and using the voltage corresponding to the obtained maximum noise value as the maximum excitation voltage; when applying overvoltage excitation through a voltage regulator in step S1, the overvoltage excitation is equal to the maximum excitation voltage.

[0012] Optionally, when collecting the noise index of the test distribution transformer under overvoltage excitation in step S2, it includes collecting the noise index of the test distribution transformer under overvoltage excitation at at least one of the specified positions on the equipment body, in the distribution room, in the substation room, and in the site of the test distribution transformer.

[0013] Optionally, when collecting the noise index of the test distribution transformer under overvoltage excitation in step S2, it includes collecting the noise index of the test distribution transformer under overvoltage excitation at a position at a specified distance from the test distribution transformer.

[0014] Optionally, when collecting the noise index of the test distribution transformer under overvoltage excitation in step S2, it includes collecting the noise index of the test distribution transformer under overvoltage excitation at a specified position in the nearby residential area.

[0015] In addition, the present invention also provides a system for on-site acceptance of the noise of a distribution transformer, including a voltage regulator, a sound sensor, and a control device. The control end of the voltage regulator is connected to the control device, and the output end of the sound sensor is connected to the control device. The control device includes a microprocessor and a memory connected to each other. The microprocessor is programmed or configured to execute the method for on-site acceptance of the noise of the distribution transformer.

[0016] In addition, the present invention also provides a computer-readable storage medium storing a computer program, which is programmed or configured by a microprocessor to execute the on-site acceptance method for the noise of the distribution transformer.

[0017] Compared with the prior art, the present invention mainly has the following advantages:

[0018] 1. Through a large number of studies and actual tests, it has been confirmed that after the input voltage of the distribution transformer exceeds the rated voltage, the noise and vibration (resulting in the vibration of the installation foundation) increase significantly. Compared with the common operating conditions with large noise such as overload, three-phase unbalanced load, and harmonic-containing load, the noise level and vibration are comparable. The present invention uses overvoltage excitation to make the distribution transformer in an overvoltage condition so that the noise and vibration are in the maximum state. The overvoltage condition can effectively and equivalently cover the maximum values of the noise and vibration under common operating conditions with large noise such as overload, three-phase unbalanced load, and harmonic-containing load, thereby accurately judging whether there is a risk of excessive noise of the distribution transformer under common operating conditions with large noise such as overvoltage, overload, three-phase unbalanced load, and harmonic-containing load, so as to realize the acceptance of transformer noise and ensure that the distribution transformer will not cause excessive noise pollution to the public through air or building structure during different operating conditions, providing a new method for the on-site acceptance of the noise and structure noise of the distribution transformer.

[0019] 2. Compared with the means of obtaining the maximum noise caused by the distribution transformer by setting operating conditions such as overload, three-phase unbalanced load, and harmonic-containing load, the present invention uses the overvoltage loading condition during the on-site acceptance, which can be achieved only by using a simple power device - a voltage regulator, without the need for complex electrical equipment or systems, and can quickly and simply obtain the maximum noise caused by the distribution transformer, with the advantages of simple device setup, easy implementation, and simple and fast operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the basic process of the method in the first embodiment of the present invention.

[0021] Figure 2 It is the sound power level of a certain 10kV distribution transformer under different operating conditions in the first embodiment of the present invention.

[0022] Figure 3 It is the magnitude of the foundation vibration of a certain 10kV distribution transformer under different operating conditions in the first embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Embodiment 1:

[0024] As Figure 1 shown, the on-site acceptance method for the noise of the distribution transformer in this embodiment includes:

[0025] S1. For the test distribution transformer in the off - line state, connect a voltage regulator to the high - voltage side of the test distribution transformer, and apply an over - voltage excitation through the voltage regulator. The over - voltage excitation is greater than the rated voltage of the test distribution transformer.

[0026] S2. Collect the noise index of the test distribution transformer under the over - voltage excitation state, and determine whether the on - site acceptance of the noise of the test distribution transformer passes according to whether the noise index of the test distribution transformer exceeds the standard.

[0027] In this embodiment, the test distribution transformer in the off - line state in step S1 refers to disconnecting all the connections of the high - voltage side and the low - voltage side of the test distribution transformer, which can prevent the impact of over - voltage excitation on the power grid or load.

[0028] In this embodiment, when disconnecting all the connections of the high - voltage side and the low - voltage side of the test distribution transformer, it also includes setting the tap - changing switch of the test distribution transformer to the rated voltage position to ensure the accuracy of the noise detection of the test distribution transformer.

[0029] The purpose of applying the over - voltage excitation through the voltage regulator in step S1 is to use the over - voltage method to approximately obtain the maximum value of the distribution transformer noise in a simple way to accept the distribution transformer and ensure the detection accuracy of its noise and structure noise compliance. The value of the over - voltage excitation needs to be greater than the rated voltage of the test distribution transformer, but it is not the larger the better, because under the same noise index, the larger the value of the over - voltage excitation, the more stringent the on - site acceptance of the noise will be. As a preferred implementation, when applying the over - voltage excitation through the voltage regulator in step S1, the over - voltage excitation is equal to 1.05 times the rated voltage of the test distribution transformer, and this value achieves the balance between the accuracy of noise detection and the stringency of on - site noise acceptance.

[0030] It should be noted that, when the influence of other interference noises is not significant, the noise test of the transformer (distribution room, switchgear room) or the sensitive point can be carried out according to the conventional method, or the noise value can be measured around the transformer in the building or at the sensitive point (for outdoor transformers and switchgear rooms), or at the specified positions in the room. In this embodiment, when collecting the noise index of the tested distribution transformer under the overvoltage excitation state in step S2, it includes collecting the noise index of the tested distribution transformer under the overvoltage excitation state at least one of the equipment body of the tested distribution transformer, the distribution room, the switchgear room, and the specified positions in the site. In this embodiment, when collecting the noise index of the tested distribution transformer under the overvoltage excitation state in step S2, it includes collecting the noise index of the tested distribution transformer under the overvoltage excitation state at the position at a specified distance from the tested distribution transformer. In this embodiment, when collecting the noise index of the tested distribution transformer under the overvoltage excitation state in step S2, it includes collecting the noise index of the tested distribution transformer under the overvoltage excitation state at the specified positions in the nearby residential area. Finally, it is necessary to judge whether the on-site acceptance of the noise of the tested distribution transformer passes according to whether the noise index of the tested distribution transformer exceeds the standard. If the noise index exceeds the set standard requirement value, it is determined that the on-site acceptance of the noise of the tested distribution transformer fails (indicating that the operation of this distribution transformer may cause the problem of excessive noise), otherwise, it is determined that the on-site acceptance of the noise of the tested distribution transformer passes (indicating that the operation of this distribution transformer will probably not cause the problem of excessive noise).

[0031] As Figure 2 and Figure 3 shown are the test results of the noise sound power level and the ground vibration of a certain 10kV / 800KVA distribution transformer under various working conditions. The test environment is an anechoic laboratory. From Figure 2 it can be seen that under the condition of 1.05 times the rated voltage under no-load, its noise level is comparable to that of the common working conditions with large noises such as overload, unbalanced three-phase load, and harmonic-containing load. From Figure 3It can also be seen that when the input voltage of the distribution transformer reaches 1.05 times the rated voltage, the vibration on the ground is greater than that in other working conditions, which can approximately represent the maximum vibration during the operation of the transformer. Thus, it can be seen that after the input voltage of the distribution transformer exceeds the rated voltage, the growth of its noise and vibration (resulting in the vibration of the installation foundation) is very obvious. Compared with the common working conditions with large noise such as overload, unbalanced three-phase load, and harmonic-containing load, the sound power level and vibration are equivalent. The method of this embodiment uses overvoltage excitation to make the distribution transformer in an overvoltage working condition so that the noise and vibration are in the maximum state. The overvoltage working condition can effectively and equivalently cover the maximum values of noise and vibration in common working conditions with large noise such as overload, unbalanced three-phase load, and harmonic-containing load, so as to accurately judge whether there is a risk of excessive noise in the distribution transformer under common working conditions with large noise such as overvoltage, overload, unbalanced three-phase load, and harmonic-containing load, thus realizing the noise acceptance of the transformer and ensuring that the distribution transformer will not cause excessive noise pollution to the public through air or building structure during different operating conditions, providing a new method for the on-site acceptance of the noise and structure noise of the distribution transformer. Compared with the means of obtaining the maximum noise caused by the distribution transformer by setting working conditions such as overload, unbalanced three-phase load, and harmonic-containing load, the method of this embodiment uses the overvoltage loading working condition during on-site acceptance, which can be achieved only by using a simple power device - a voltage regulator, without the need for complex electrical equipment or systems, and can quickly and simply obtain the maximum noise caused by the distribution transformer, with the advantages of simple device construction, easy implementation, and simple and fast operation.

[0032] In addition, this embodiment also provides a on-site acceptance system for the noise of a distribution transformer, including a voltage regulator, a sound sensor, and a control device. The control end of the voltage regulator is connected to the control device, and the output end of the sound sensor is connected to the control device. The control device includes a microprocessor and a memory connected to each other. The microprocessor is programmed or configured to execute the aforementioned on-site acceptance method for the noise of the distribution transformer. In addition, this embodiment also provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be programmed or configured by the microprocessor to execute the aforementioned on-site acceptance method for the noise of the distribution transformer.

[0033] Embodiment 2:

[0034] This embodiment is basically the same as Embodiment 1, and the main difference is the way of obtaining the overvoltage excitation value. In this embodiment, a method of obtaining prior verification by using a distribution transformer of the same model as the tested distribution transformer is adopted to overcome the difference in the overvoltage excitation values required for distribution transformers of different models. In this embodiment, before step S1, there is also a step of connecting the high-voltage side to a voltage regulator and applying overvoltage excitation through the voltage regulator in an off-line state for a distribution transformer of the same model as the tested distribution transformer to obtain the maximum noise value, and taking the voltage corresponding to the obtained maximum noise value as the maximum excitation voltage; in step S1, when applying overvoltage excitation through the voltage regulator, the overvoltage excitation is equal to the maximum excitation voltage. By the above method, the overvoltage excitation values required for distribution transformers of different models are different, and the voltage excitation values are more objective and accurate, so as to overcome the difference in the overvoltage excitation values required for distribution transformers of different models, and thus improve the accuracy of noise acceptance for distribution transformers of different models.

[0035] In addition, this embodiment also provides a field acceptance system for distribution transformer noise, including a voltage regulator, a sound sensor, and a control device. The control end of the voltage regulator is connected to the control device, and the output end of the sound sensor is connected to the control device. The control device includes a microprocessor and a memory connected to each other. The microprocessor is programmed or configured to execute the foregoing method for field acceptance of distribution transformer noise. In addition, this embodiment also provides a computer-readable storage medium, in which a computer program is stored. The computer program is used to be programmed or configured by the microprocessor to execute the foregoing method for field acceptance of distribution transformer noise.

[0036] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes. The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the processes and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate for implementing in the process Figure 1 One process or multiple processes and / or blocksFigure 1 a device for the functions specified in one or more boxes. These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device that implements the functions in the process Figure 1 one process or more processes and / or boxes Figure 1 a device for the functions specified in one or more boxes. These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one process or more processes and / or boxes Figure 1 a device for the functions specified in one or more boxes.

[0037] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as within the protection scope of the present invention.

Claims

1. A method for on-site acceptance of the noise of a distribution transformer, characterized in that, Including: S1. For the test distribution transformer in the off-line state, connect a voltage regulator to the high-voltage side of the test distribution transformer, and apply an over-voltage excitation through the voltage regulator, where the over-voltage excitation is greater than the rated voltage of the test distribution transformer; S2. Collect the noise index of the test distribution transformer in the over-voltage excitation state, and determine whether the on-site acceptance of the noise of the test distribution transformer passes according to whether the noise index of the test distribution transformer exceeds the standard; The test distribution transformer in the off-line state in step S1 refers to disconnecting all the connections of the high-voltage side and the low-voltage side of the test distribution transformer. When disconnecting all the connections of the high-voltage side and the low-voltage side of the test distribution transformer, it also includes setting the tap-changer of the test distribution transformer to the rated voltage position; Before step S1, it also includes a step of, for the distribution transformer of the same model as the test distribution transformer, connecting a voltage regulator to the high-voltage side in the off-line state and applying an over-voltage excitation through the voltage regulator to obtain the maximum noise value, and taking the voltage corresponding to the obtained maximum noise value as the maximum excitation voltage; when applying the over-voltage excitation through the voltage regulator in step S1, the over-voltage excitation is equal to the maximum excitation voltage.

2. The method for on-site acceptance of the noise of a distribution transformer according to claim 1, characterized in that, When applying the over-voltage excitation through the voltage regulator in step S1, the over-voltage excitation is equal to 1.05 times the rated voltage of the test distribution transformer.

3. The method for on-site acceptance of the noise of a distribution transformer according to claim 1, characterized in that, When collecting the noise index of the test distribution transformer in the over-voltage excitation state in step S2, it includes collecting the noise index of the test distribution transformer in the over-voltage excitation state at at least one of the specified positions on the equipment body, in the distribution room, in the substation room, and in the site of the test distribution transformer.

4. The method for on-site acceptance of the noise of a distribution transformer according to claim 1, characterized in that, When collecting the noise index of the test distribution transformer in the over-voltage excitation state in step S2, it includes collecting the noise index of the test distribution transformer in the over-voltage excitation state at a position at a specified distance from the test distribution transformer.

5. The method for on-site acceptance of the noise of a distribution transformer according to claim 1, characterized in that, When collecting the noise index of the test distribution transformer in the over-voltage excitation state in step S2, it includes collecting the noise index of the test distribution transformer in the over-voltage excitation state at a specified position in the nearby residential area.

6. A system for on-site acceptance of the noise of a distribution transformer, characterized in that, Including a voltage regulator, a sound sensor and a control device. The control end of the voltage regulator is connected to the control device, the output end of the sound sensor is connected to the control device, and the control device includes a microprocessor and a memory connected to each other. The microprocessor is programmed or configured to execute the method for on-site acceptance of the noise of the distribution transformer according to any one of claims 1 to 5.

7. A computer-readable storage medium, in which a computer program is stored, characterized in that, The computer program is used to be programmed or configured by the microprocessor to execute the method for on-site acceptance of the noise of the distribution transformer according to any one of claims 1 to 5.

Images