Monitoring device of distribution transformer
By integrating components such as power switching modules, the distribution transformer monitoring device solves the problems of complexity and large size in existing technologies, and achieves efficient multi-functional monitoring and simplified maintenance.
Patent Information
- Application Number
- CN202422634480.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-10-29
AI Technical Summary
Existing power distribution transformer monitoring devices require a variety of complex components, resulting in a large workload, difficulty in selection, and large device size, making maintenance inconvenient.
Design a monitoring device that integrates a power switching module, an air switch, a power conversion module, a measurement module, a protection module, and a communication module to achieve an integrated design that combines distribution transformer metering, power quality monitoring, and protection functions, thereby reducing engineering maintenance.
The integrated design reduces the size of the device, simplifies engineering maintenance, enables multi-functional monitoring of distribution transformers, and improves power supply reliability and device independence.
Smart Images
Figure CN223583876U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to monitoring device technical field, especially a kind of monitoring device of distribution transformer. BACKGROUND
[0002] In the medium-voltage distribution network of power system, there are a large number of distribution transformers operating in indoor or outdoor environment, and the damage rate of distribution transformers is very high. Without considering the low utilization rate of power generation due to power failure, fault leakage power loss, etc., only the annual investment in funds and personnel for replacing transformers is quite huge, so it is necessary to monitor the distribution transformer.
[0003] However, at present, monitoring of distribution transformers generally requires multiple complex devices, including distribution transformer metering, distribution transformer power quality monitoring, distribution transformer protection, distribution transformer outgoing line protection, and multiple power instruments and meters for remote communication forwarding. Various devices have many engineering quantities and selection difficulties in power supply, structure position installation, mutual communication cooperation, protection hierarchical cooperation, field maintenance configuration, engineering joint debugging test and other inconvenient factors. UTILITY MODEL CONTENT
[0004] To solve the above technical problems, the purpose of the utility model is to provide a kind of monitoring device of distribution transformer, which can reduce engineering maintenance and reduce volume.
[0005] The technical scheme adopted by the utility model to solve its technical problems is: a kind of monitoring device of distribution transformer, the monitoring device includes: power switching module, air switch, power conversion module, measurement module, protection module and communication module, wherein the input end of the power switching module is connected with the three-phase voltage circuit of distribution transformer, the output end of the power switching module is connected with the input end of the air switch, the output end of the air switch is connected with the input end of the power conversion module, the power input end of the measurement module and the power input end of the communication module respectively, the output end of the power conversion module is connected with the power input end of the protection module, the output end of the protection module is connected with the first input end of the communication module, and the output end of the measurement module is connected with the second input end of the communication module.
[0006] Further, as an optional embodiment, the current input end of the measurement module is connected with the three-phase current circuit of distribution transformer, the current output end of the measurement module is connected with the current input end of the protection module, and the current output end of the protection module is connected with the three-phase current circuit.
[0007] Further, as an optional embodiment, the sensing input end of the measurement module is connected with external sensor.
[0008] Further, as an optional implementation, the power switching module is a three-way power switching module.
[0009] Further, as an optional implementation, the protection module comprises an incoming channel and an outgoing channel, the incoming channel is used for collecting state monitoring and protection signals of the distribution transformer, and the outgoing channel is used for connecting closing coils and opening coils of switches of the distribution transformer.
[0010] Further, as an optional implementation, the monitoring device further comprises a temperature and humidity sensing module, a power input end of the temperature and humidity sensing module is connected to an output end of the power conversion module, and a signal output end of the temperature and humidity sensing module is connected to a second input end of the communication module.
[0011] The utility model discloses a beneficial effect is: monitoring device includes power switching module, air switch, power conversion module, measurement module, protection module and communication module, and the distribution transformer is monitored to distribution transformer electric quantity signal, the body non - electric quantity signal, input and output signal, operating environment state through measurement module and protection module collection, and the structure adopts the integrated design, can concentrate and complete distribution transformer metering, distribution transformer electric energy quality monitoring, distribution transformer protection, distribution transformer outgoing line protection, telecontrol communication retransmission function, has reduced the engineering maintenance, and the volume of monitoring device has been reduced. BRIEF DESCRIPTION OF DRAWINGS
[0012] The utility model will be further described below in connection with the drawings and examples.
[0013] Figure 1 It is the electrical principle block diagram of the utility model one kind distribution transformer's monitoring device;
[0014] Figure 2 It is the structural schematic diagram of the utility model one kind distribution transformer's monitoring device. DETAILED DESCRIPTION
[0015] REFERENCE Figure 1 A kind of monitoring device of distribution transformer, the monitoring device includes: power switching module, air switch, power conversion module, measurement module, protection module and communication module, wherein, the input end of the power switching module is connected to the three-phase voltage circuit of distribution transformer, the output end of the power switching module is connected with the input end of the air switch, the output end of the air switch is connected respectively the input end of the power conversion module, the power input end of the measurement module and the power input end of the communication module, the output end of the power conversion module is connected the power input end of the protection module, the output end of the protection module is connected the first input end of the communication module, the output end of the measurement module is connected the second input end of the communication module.
[0016] In the embodiment of the present application, please refer to Figure 1 , Figure 1 In the embodiment of the present application, please refer to Figure 1 , CTA\CTB\CTC is the current channel, that is, the three-phase current circuit of the distribution transformer. The current input end of the measurement module is connected to the three-phase current circuit of the distribution transformer, so as to obtain the current signal of the distribution transformer for corresponding calculation, and then the current output end of the measurement module is connected to the current input end of the protection module, and the current output end of the protection module is connected to the three-phase current circuit, which can be connected back to the external terminal of the monitoring device to form a current closed loop. Among them, the current is adopted in a series connection mode, first passing through the measurement module and then reaching the protection module. The protection module can calculate the three-phase current and judge the fault processing logic, so as to realize the functions of phase-to-phase short circuit protection and single-phase ground protection.
[0017] Further, as an optional implementation, the current input end of the measurement module is connected to the three-phase current circuit of the distribution transformer, the current output end of the measurement module is connected to the current input end of the protection module, and the current output end of the protection module is connected to the three-phase current circuit.
[0018] In the embodiment of the present application, please refer to Figure 1 , CTA\CTB\CTC is the current channel, that is, the three-phase current circuit of the distribution transformer. The current input end of the measurement module is connected to the three-phase current circuit of the distribution transformer, so as to obtain the current signal of the distribution transformer for corresponding calculation, and then the current output end of the measurement module is connected to the current input end of the protection module, and the current output end of the protection module is connected to the three-phase current circuit, which can be connected back to the external terminal of the monitoring device to form a current closed loop. Among them, the current is adopted in a series connection mode, first passing through the measurement module and then reaching the protection module. The protection module can calculate the three-phase current and judge the fault processing logic, so as to realize the functions of phase-to-phase short circuit protection and single-phase ground protection.
[0019] Further, as an optional implementation, the current input end of the measurement module is connected to the three-phase current circuit of the distribution transformer, the current output end of the measurement module is connected to the current input end of the protection module, and the current output end of the protection module is connected to the three-phase current circuit.
[0020] In the embodiment of the present application, the sensing input end of the measurement module is connected with an external sensor, which can include a three-phase sensor, and the corresponding sensing signals can be collected through the A-phase sensor, B-phase sensor, C-phase sensor and N-phase sensor to realize the monitoring of the distribution transformer. The three-phase voltage circuit of the distribution transformer can be directly input to the voltage input end of the measurement module, and the three-phase current circuit of the distribution transformer is input to the current input end of the measurement module, and the current and voltage of the distribution transformer are collected by the measurement module to calculate the three-phase voltage, three-phase current, three-phase power, power factor, electric energy measurement, power quality, each phase voltage harmonic and distortion rate, each phase current harmonic and distortion rate, voltage three-phase imbalance, current three-phase imbalance, voltage sag and voltage fluctuation of the distribution transformer, so as to monitor the distribution transformer.
[0021] Further, as an optional implementation, the power switching module is a three-way power switching module.
[0022] In the embodiment of the present application, the voltage channel is used to provide the collection of the voltage signal and the power supply of the working power supply of the monitoring device at the same time. Through the power switching module, the situation that a certain voltage cannot work due to the absence of the voltage can be prevented. When a certain power supply loses power, the three-way power switching module will switch to other power supply within 20 ms to continue to supply power, so as to realize the switching without power failure, thereby supplying power to the measurement module and the communication module.
[0023] Further, as an optional implementation, the protection module includes an incoming channel and an outgoing channel. The incoming channel is used to collect the state monitoring and protection signals of the distribution transformer, and the outgoing channel is used to connect the closing coil and the opening coil of the switch of the distribution transformer.
[0024] In the embodiment of the present application, the protection module can collect the light gas, heavy gas, oil level, switch closing position, switch opening position of the distribution transformer and the door control signal of the distribution room through the 6-way incoming channel. Through the outgoing channel, the closing coil and the opening coil of the switch can be connected to realize the opening and closing functions, so as to realize the protection of the distribution transformer and the protection of the low-voltage side outgoing line of the distribution transformer.
[0025] Further, as an optional implementation, the monitoring device further includes a temperature and humidity sensing module, the power input end of the temperature and humidity sensing module is connected with the output end of the power conversion module, and the signal output end of the temperature and humidity sensing module is connected with the second input end of the communication module.
[0026] In the embodiment of the present application, the temperature and humidity sensing module is used for monitoring the ambient temperature and humidity of the power distribution transformer, the power supply of the temperature and humidity sensing module is provided inside the monitoring device, the power input end of the temperature and humidity sensing module is connected through the output end of the power conversion module for power supply, and then the ambient temperature and humidity are output to the second input end of the communication module through the communication port of the temperature and humidity sensing module. The first input end of the communication module is the data uploading channel of the measurement module, and the second input end is the data uploading channel of the protection module and the temperature and humidity sensor, and then the data is uploaded to the background through the wireless channel.
[0027] The utility model will be further explained in detail in combination with specific embodiments.
[0028] Please refer to Figure 2 The monitoring device of the power distribution transformer includes a measurement module 201, a protection module 202, a communication module 203, a power conversion module 204, a power switching module 205, and an external terminal block 206. The measurement module 201 is used to collect the current and voltage of the power distribution transformer for corresponding calculation and monitoring. The protection module 202 calculates the three-phase current and determines the fault handling logic to realize the functions of phase-to-phase short circuit protection and single-phase grounding protection. The communication module 203 is used to receive the data uploaded by the measurement module and the protection module and upload it to the background through a wireless channel such as an antenna. The background can be a computer, a mobile phone, or other terminals. The power conversion module 204 is used to convert the three-phase voltage into a direct current or alternating current power supply for the measurement module, the protection module, and the communication module. The power switching module 205 is used to switch the three-phase power supply to a single-phase power supply. The external terminal block 206 has 30 positions and is used to connect the power distribution transformer and various external sensors.
[0029] Compared with the existing technology, the monitoring device of the power distribution transformer realizes the functions of three power supply options and uninterrupted switching through the power switching module, realizes power redundancy design, and ensures power supply reliability. The protection module and the measurement module can share the current transformer and the voltage transformer in the embodiment of the present application, but the measurement module and the protection module are separate modules, which ensures reliability and independence. The monitoring device of the power distribution transformer provided by the utility model can realize power distribution transformer metering, power distribution transformer power quality monitoring, power distribution transformer protection, power distribution transformer outlet protection, power distribution room environment monitoring, and remote communication forwarding functions. Through the six-in-one function integration design, engineering maintenance is reduced, and the size of the device is reduced.
[0030] The above is a specific description of the preferred embodiment of the present application, but the present application is not limited to the described embodiment, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.
Claims
1. A monitoring device for a distribution transformer, characterized in that, The monitoring device includes: a power switching module, an air switch, a power conversion module, a measurement module, a protection module, and a communication module. The input terminal of the power switching module is connected to the three-phase voltage circuit of the distribution transformer. The output terminal of the power switching module is connected to the input terminal of the air switch. The output terminal of the air switch is connected to the input terminals of the power conversion module, the measurement module, and the communication module, respectively. The output terminal of the power conversion module is connected to the power input terminal of the protection module. The output terminal of the protection module is connected to the first input terminal of the communication module. The output terminal of the measurement module is connected to the second input terminal of the communication module.
2. The monitoring device for a distribution transformer according to claim 1, characterized in that, The current input terminal of the measurement module is connected to the three-phase current circuit of the distribution transformer, the current output terminal of the measurement module is connected to the current input terminal of the protection module, and the current output terminal of the protection module is connected to the three-phase current circuit.
3. The monitoring device for a distribution transformer according to claim 1, characterized in that, The sensing input terminal of the measurement module is connected to an external sensor.
4. The monitoring device for a distribution transformer according to claim 1, characterized in that, The power switching module is a three-in-one power switching module.
5. A monitoring device for a distribution transformer according to claim 1, characterized in that, The protection module includes an input channel and an output channel. The input channel is used to collect the status monitoring and protection signals of the distribution transformer, and the output channel is used to connect the closing coil and the opening coil of the switch of the distribution transformer.
6. A monitoring device for a distribution transformer according to any one of claims 1-5, characterized in that, The monitoring device also includes a temperature and humidity sensing module. The power input terminal of the temperature and humidity sensing module is connected to the output terminal of the power conversion module, and the signal output terminal of the temperature and humidity sensing module is connected to the second input terminal of the communication module.