CN211785767U - Transformer core grounding current on-line monitoring device - Google Patents
Transformer core grounding current on-line monitoring device Download PDFInfo
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- CN211785767U CN211785767U CN201921755865.3U CN201921755865U CN211785767U CN 211785767 U CN211785767 U CN 211785767U CN 201921755865 U CN201921755865 U CN 201921755865U CN 211785767 U CN211785767 U CN 211785767U
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Abstract
The utility model discloses a transformer core grounding current on-line monitoring device, which comprises an iron core grounding part arranged on a transformer main body, a transformer core grounding current sensor, a data processing module, a singlechip control module, a local area network wireless transmission module, a power supply module and an in-station monitoring device; the transformer core grounding current sensor is sleeved on the core grounding part, the transformer core grounding current sensor, the data processing module, the single-chip microcomputer control module, the local area network wireless transmission module and the in-station monitoring device are sequentially connected, and the power supply module is connected with the single-chip microcomputer control module to supply power for the whole device. Whether there is iron core multiple spot ground connection in the transformer can directly be reflected in the monitoring to the electric current of iron core ground connection spare, have that the real-time is good, the advantage that the precision is high, discovery trouble hidden danger that can be timely accurate avoids the manual work to patrol and examine the manpower and materials waste that leads to and the potential safety hazard that the timeliness is poor to lead to.
Description
Technical Field
The utility model relates to a transformer on-line monitoring technical field, concretely relates to transformer core grounding current on-line monitoring device.
Background
The power transformer is one of important component equipment of a power system, and the safe and stable operation of the power transformer is an important guarantee for the safety of the power system. When the iron core/clamping piece is grounded at two points or multiple points, the grounding current of the iron core/clamping piece is obviously increased to cause local overheating of equipment, even the iron core/clamping piece is locally burnt to fuse a grounding sheet in serious cases, so that potential suspension of the iron core/clamping piece is generated to cause a discharge fault, and the reliable operation of the transformer and a power grid is seriously threatened.
At present, a means for detecting the grounding current of a transformer core by substation operators mainly adopts a pincer-shaped ammeter to measure the current of a grounding outgoing line of the transformer core. Therefore, manpower and material resources are wasted, regular measurement cannot be carried out on some unattended transformer substations, and potential safety hazards are left for operation of electrical equipment of the transformer substations. In addition, the method has multiple steps and complex operation, online analysis cannot be realized, and the detection precision and timeliness have problems under the interference of a strong electromagnetic environment on site.
Although some transformer core grounding current online monitoring devices are continuously developed by some scientific research institutes and manufacturers in China with the continuous popularization and application of online monitoring technology in recent years, the monitoring devices generally have the defects of single function, unreasonable field measurement and installation mode, large construction amount due to wired transmission of collected data, and operation risk to an operating transformer in the construction process.
SUMMERY OF THE UTILITY MODEL
To prior art's not enough, the utility model provides a transformer core earth current on-line monitoring device.
In order to achieve the above purpose, the technical scheme of the utility model is that:
an on-line monitoring device for grounding current of a transformer iron core comprises an iron core grounding piece arranged on a transformer main body, a grounding current acquisition module arranged on the iron core grounding piece of the transformer and an in-station monitoring device;
the grounding current acquisition module comprises a transformer iron core grounding current sensor, a data processing module, a single chip microcomputer control module, a local area network wireless transmission module and a power supply module;
the transformer iron core grounding current sensor is sleeved on an iron core grounding part of the transformer and used for acquiring a power frequency alternating current small current signal of the iron core grounding part and converting the acquired primary current signal into a secondary current signal;
the input end of the data processing module is connected with the output end of the transformer core grounding current sensor and used for converting a secondary current signal into a voltage signal, and the output end of the data processing module is connected with the single chip microcomputer control module through a digital-to-analog conversion pin and outputs the voltage signal to the single chip microcomputer control module so as to calculate a grounding current signal;
the single-chip microcomputer control module is used for receiving the voltage signal of the data processing module and calculating to obtain a grounding current value, the single-chip microcomputer control module is connected with the local area network wireless transmission module in a serial port communication mode, and the single-chip microcomputer control module transmits the calculated current signal to the local area network wireless transmission module;
the power supply module is connected with the single chip microcomputer control module and used for supplying power to the whole device module;
the local area network wireless transmission module is used for transmitting the grounding current signal to the in-station monitoring device;
the in-station monitoring device is connected with the local area network wireless transmission module through serial port communication, acquires grounding current data and displays the grounding current.
Furthermore, the data processing module comprises a signal conditioning circuit and a signal acquisition module, the input end of the signal conditioning circuit is connected with the output end of the transformer core grounding current sensor, the input end of the signal acquisition module is connected with the output end of the signal conditioning circuit, and the output end of the signal acquisition module is connected with the single chip microcomputer control module.
Furthermore, the grounding current sensor of the transformer iron core adopts a sensor of a through permalloy.
Further, the single chip microcomputer control module is connected with an LED lamp indicating circuit, a reset circuit and a crystal oscillator circuit.
Further, the power supply module comprises a battery, a 12V-to-5V circuit and a 5V-to-3.3V circuit.
Compared with the prior art, the utility model, have following advantage:
1. whether there is iron core multiple spot ground connection in the transformer can directly be reflected in the monitoring to the electric current of iron core ground connection spare, have that the real-time is good, the advantage that the precision is high, discovery trouble hidden danger that can be timely accurate avoids the manual work to patrol and examine the manpower and materials waste that leads to and the potential safety hazard that the timeliness is poor to lead to.
2. The insulating situation of the transformer is monitored in real time, so that the accident is reduced, the overhaul interval is prolonged, the power failure overhaul times and time are reduced, and the equipment utilization rate and the overall economic benefit are improved.
3. The transformer core grounding current data is transmitted through the local area network in a wireless mode, and on the basis that data acquisition and transmission are reliable, construction amount is reduced, cost is reduced, and operation risks are reduced.
Drawings
FIG. 1 is a schematic structural diagram of the transformer core grounding current on-line monitoring device;
FIG. 2 is a schematic structural diagram of a grounding current collection device;
FIG. 3 is a schematic structural diagram of a signal conditioning circuit diagram of the transformer core grounding current on-line monitoring device;
FIG. 4 is a schematic structural diagram of a 12V to 5V circuit in a power supply module of the ground current collection device;
FIG. 5 is a schematic structural diagram of a circuit for converting 5V to 3.3V in a power supply module of the grounding current collection device;
description of reference numerals: 1. an iron core grounding member; 2. a grounding current collection module; 3. the transformer iron core is grounded with the current sensor.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1 and 2, an online monitoring device for grounding current of a transformer core comprises a core grounding member disposed on a transformer body, a grounding current collecting module disposed on the core grounding member, and an in-station collection monitoring device;
the grounding current acquisition module comprises a transformer iron core grounding current sensor, a data processing module, a single chip microcomputer control module, a local area network wireless transmission module and a power supply module;
the transformer iron core grounding current sensor is sleeved on an iron core grounding part of the transformer and used for acquiring a power frequency alternating current small current signal of the iron core grounding part and converting the acquired primary current signal into a secondary current signal;
the input end of the data processing module is connected with the output end of the transformer core grounding current sensor and used for converting a secondary current signal into a voltage signal, and the output end of the data processing module is connected with the single chip microcomputer control module through a digital-to-analog conversion pin and outputs the voltage signal to the single chip microcomputer control module so as to calculate a grounding current signal;
the singlechip control module is used for receiving a voltage signal of the data processing module, the singlechip calculates the internal value of the grounding current, the singlechip control module is connected with the local area network wireless transmission module in a serial port communication mode, and the singlechip control module transmits the calculated current signal to the local area network wireless transmission module;
the power supply module is connected with the single chip microcomputer control module and used for supplying power to the whole device module;
the local area network wireless transmission module is used for transmitting the grounding current signal to the in-station monitoring device;
the in-station monitoring device is connected with the local area network wireless transmission module through serial port communication, acquires grounding current data and displays the grounding current.
The transformer core grounding current sensor is sleeved on an iron core grounding part of a transformer and used for acquiring a current signal of the iron core grounding part, converting the acquired primary current signal into a secondary current signal and outputting the secondary current signal to a data processing module. The permalloy sensor has good magnetic conductivity and high sensitivity, can keep good linearity within the range of 30 mA-1A, is a through sensor, and is simple and convenient to install.
The data processing module comprises a signal conditioning circuit and a signal acquisition module, the input end of the signal conditioning circuit is connected with the output end of the transformer core grounding current sensor, the input end of the signal acquisition module is connected with the output end of the signal conditioning circuit, and the output end of the signal acquisition module is connected with the single chip microcomputer control module. The data processing module is used for converting current signals collected and output by the transformer core grounding current sensor into voltage signals and transmitting the voltage signals to the single chip microcomputer control module, specifically, a signal conditioning circuit is shown in fig. 3, which is a commonly used circuit, and is assumed to be connected with an output I1 of the transformer core grounding current sensor, an output I1 outputs voltage signals V1P and V1N through resistors R20 and R21 conditioning circuits and filter circuits of C20 and C21; the signal acquisition circuit adopts the collection of interchange electric energy collection module, and after configuration module minimum circuit, collection module exports alternating voltage signal to singlechip module through TX and RX serial ports.
The single chip microcomputer control module is mainly composed of a single chip microcomputer chip and is used for receiving voltage signals sent by the data processing module and calculating to obtain a grounding current value. The single chip microcomputer control module comprises an LED lamp indicating circuit, a reset circuit and a crystal oscillator circuit. The LED lamp indicating circuit is used for indicating whether the power supply module supplies power or not; the reset circuit is used for resetting the singlechip control circuit to ensure the normal operation of the singlechip; the crystal oscillator circuit is used for generating original clock frequency and controlling the working frequency of different devices in the single chip microcomputer control module. The single chip microcomputer chip has powerful functions, is a small and perfect microcomputer system formed by integrating a central processing unit CPU with data processing capacity, a random access memory RAM, a read-only memory ROM, various I/O ports, interrupt systems, a timer/counter and other functions (possibly comprising a display driving circuit, a pulse width modulation circuit, an analog multiplexer, an A/D converter and other circuits) on a silicon chip by adopting a super-large scale integrated circuit technology, and has wide application in the field of industrial control.
The power supply module comprises a battery for supplying power to the whole current acquisition module, a circuit from 12V to 5V and a circuit from 5V to 3.3V, wherein the specific circuits are shown IN fig. 4 and 5, the output end of the battery 1 is connected with 12V IN IN the circuit from 12V to 5V, and the voltage of the battery outputs 5V voltage through the circuit from 12V to 5V for the module which needs to supply power by using 5V voltage; the output 5V voltage is connected to the +5V end in the circuit from 5V to 3.3V, and is used for generating 3.3V voltage for the singlechip and the module which needs to be powered by 3.3V voltage.
And the local area network wireless transmission module is used for communicating with the local area network wireless transmission module of the grounding current acquisition device, acquiring grounding current data and issuing acquisition instructions to the grounding current acquisition device.
The local area network wireless communication module is used for data transmission connection between the solid line grounding current acquisition device and the in-station collection monitoring device, the single-chip microcomputer control module is connected with the local area network wireless transmission module in a serial port communication mode, grounding current data are acquired from the single-chip microcomputer control module, the in-station monitoring device is connected with the local area network wireless transmission module in a serial port communication mode, the acquired grounding current data can be acquired remotely, and the grounding current is displayed. The local area network wireless communication module adopts the 433MHZ wireless communication module to upload the measuring result to the in-station monitoring device according to the MODBUS communication protocol, so that the working personnel can monitor and test the data, and can also configure parameters such as communication, measurement, alarm and calibration through the in-station monitoring device. The in-station monitoring device mentioned here is actually a device that can be operated and checked by an in-station worker, and may be a device that can display data and transmit data, such as a computer.
When the transformer core grounding current sensor is used, firstly, a primary current data signal of the core grounding piece is acquired through the transformer core grounding current sensor, meanwhile, the primary current data signal is converted into a secondary current data signal, then the secondary current data signal is converted into a voltage signal through the data processing module and is transmitted into the single chip microcomputer control module to be calculated, collected and monitored, and finally, the single chip microcomputer control module sends a signal to the in-station monitoring equipment through the local area network wireless communication module to be further monitored and detected.
The circuit connection of the whole device is simple, only need the simple with the input/output end connection of its module can, can directly reflect whether there is iron core multiple spot ground connection in the transformer through the monitoring to the electric current of iron core ground connection piece, it is good to have the real-time nature, the advantage that the precision is high, discovery trouble hidden danger that can be timely accurate, avoid the artifical manpower and materials of patrolling and examining the manpower and materials that lead to extravagant and the potential safety hazard that the timeliness is poor leads to, the realization reaches the reduction occurence of failure to transformer insulation situation real-time supervision, the extension is overhauld the interval, reduce power failure and is overhauld number of.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (5)
1. The utility model provides a transformer core ground current on-line monitoring device which characterized in that: the transformer comprises an iron core grounding piece arranged on a transformer main body, a grounding current acquisition module arranged on the transformer iron core grounding piece and an in-station monitoring device;
the grounding current acquisition module comprises a transformer iron core grounding current sensor, a data processing module, a single chip microcomputer control module, a local area network wireless transmission module and a power supply module;
the transformer iron core grounding current sensor is sleeved on an iron core grounding part of the transformer and used for acquiring a power frequency alternating current small current signal of the iron core grounding part and converting the acquired primary current signal into a secondary current signal;
the input end of the data processing module is connected with the output end of the transformer core grounding current sensor and used for converting a secondary current signal into a voltage signal, and the output end of the data processing module is connected with the single chip microcomputer control module through a digital-to-analog conversion pin and outputs the voltage signal to the single chip microcomputer control module so as to calculate a grounding current signal;
the single-chip microcomputer control module is used for receiving the voltage signal of the data processing module and calculating to obtain a grounding current value, the single-chip microcomputer control module is connected with the local area network wireless transmission module in a serial port communication mode, and the single-chip microcomputer control module transmits the calculated current signal to the local area network wireless transmission module;
the power supply module is connected with the single chip microcomputer control module and used for supplying power to the whole device module;
the local area network wireless transmission module is used for transmitting the grounding current signal to the in-station monitoring device;
the in-station monitoring device is connected with the local area network wireless transmission module through serial port communication, acquires grounding current data and displays the grounding current.
2. The transformer core grounding current on-line monitoring device of claim 1, characterized in that: the data processing module comprises a signal conditioning circuit and a signal acquisition module, wherein the input end of the signal conditioning circuit is connected with the output end of the transformer core grounding current sensor, the input end of the signal acquisition module is connected with the output end of the signal conditioning circuit, and the output end of the signal acquisition module is connected with the single-chip microcomputer control module.
3. The transformer core grounding current on-line monitoring device of claim 1, characterized in that: the grounding current sensor of the transformer iron core adopts a sensor of a through permalloy.
4. The transformer core grounding current on-line monitoring device of claim 1, characterized in that: the single chip microcomputer control module is connected with an LED lamp indicating circuit, a reset circuit and a crystal oscillator circuit.
5. The transformer core grounding current on-line monitoring device of claim 1, characterized in that: the power supply module comprises a battery, a circuit converting 12V into 5V and a circuit converting 5V into 3.3V.
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| CN201921755865.3U CN211785767U (en) | 2019-10-18 | 2019-10-18 | Transformer core grounding current on-line monitoring device |
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| CN201921755865.3U CN211785767U (en) | 2019-10-18 | 2019-10-18 | Transformer core grounding current on-line monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110716083A (en) * | 2019-10-18 | 2020-01-21 | 中国南方电网有限责任公司超高压输电公司广州局 | Transformer core grounding current on-line monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110716083A (en) * | 2019-10-18 | 2020-01-21 | 中国南方电网有限责任公司超高压输电公司广州局 | Transformer core grounding current on-line monitoring device |
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