CN210430903U

CN210430903U - Comprehensive protection device for voltage transformer

Info

Publication number: CN210430903U
Application number: CN201921874665.XU
Authority: CN
Inventors: 李少妮
Original assignee: Xi'an Blue Photoelectric Technology Co Ltd
Current assignee: Xi'an Blue Photoelectric Technology Co Ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-04-28
Anticipated expiration: 2029-11-01

Abstract

The utility model discloses a voltage transformer integrated protection device for carry out the operation monitoring protection to the voltage transformer among the electrical system, improve electrical system's operating stability. The device comprises a single chip microcomputer controller, a signal input detection module connected with the single chip microcomputer controller and a voltage transformer, a storage module connected with the single chip microcomputer controller, and a signal output feedback module. The current detection module, the voltage detection module and the temperature detection module in the signal input detection module can be used for monitoring the working state of the voltage transformer in real time, so that the voltage transformer can be timely known when a fault occurs, the fault influence can be quickly eliminated, and the operation stability of an electrical system is improved. Therefore, the method has high use value and popularization value.

Description

Comprehensive protection device for voltage transformer

Technical Field

The utility model belongs to the technical field of the voltage transformer technique and specifically relates to a voltage transformer integrated protection device is related to.

Background

Voltage transformers and transformers are very similar and are used to transform the voltage on a line. However, the purpose of transforming voltage by the transformer is to transmit electric energy, so the capacity is large, and the capacity is generally calculated by kilovolt-ampere or mega volt-ampere; the voltage transformer is used for supplying power to a measuring instrument and a relay protection device, measuring the voltage, power and electric energy of a line, or protecting valuable equipment, a motor and a transformer in the line when the line fails, so that the capacity of the voltage transformer is small, generally only a few volt-amperes and dozens of volt-amperes, and maximally not more than one thousand volt-amperes, and the voltage transformer is a transformer with an iron core. It is mainly composed of primary and secondary coils, iron core and insulation. When a voltage U1 is applied to the primary winding, a magnetic flux is generated in the core, and a secondary voltage U2 is generated in the secondary winding according to the law of electromagnetic induction. The turns of the primary winding or the secondary winding are changed to generate different ratios of the primary voltage to the secondary voltage, so that voltage transformers with different ratios can be formed.

The voltage transformer is very common and very important electrical equipment applied in an electrical system, and the voltage transformer can bring great trouble to the operation of the electrical system when a fault occurs, because electric arcs generated by short-circuit current can not only damage the insulation of a winding, but also burn out an iron core. In case of a fault, it will have serious consequences for the operation of the electrical system. Therefore, the voltage transformer needs to be monitored and protected, and stable operation of the voltage transformer is ensured.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a voltage transformer integrated protection device for carry out the operation monitoring protection to the voltage transformer among the electrical system, improve electrical system's operating stability.

In order to achieve the above object, the utility model adopts the following technical scheme:

a voltage transformer comprehensive protection device comprises a single chip microcomputer controller, a signal input detection module, a storage module and a signal output feedback module, wherein the signal input detection module is connected with the single chip microcomputer controller and a voltage transformer;

the signal input detection module comprises an analog-to-digital conversion module, a photoelectric isolator and a relay which are connected with the single chip microcomputer controller, a current detection module, a voltage detection module and a temperature detection module which are connected with the analog-to-digital conversion module, an active filter which is connected with the current detection module, the voltage detection module and the temperature detection module, a switch analog input module which is connected with the photoelectric isolator and a switch analog input module which is connected with the relay; wherein the active filter is connected with the voltage transformer.

Further, the signal output feedback module comprises an alarm device, an RS485 communication module, a wireless communication module and a human-computer interaction device which are all connected with the single-chip microcomputer controller.

Furthermore, the human-computer interaction device comprises a control chip connected with the single-chip microcomputer controller, and an LCD display device and an input keyboard which are both connected with the control chip.

Preferably, the model of the single chip microcomputer controller is AT89C 51.

Preferably, the model of the control chip is P89C51RD2 FA.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the utility model discloses a current detection module, voltage detection module, temperature detection module carry out the real-time supervision protection to voltage, electric current, the temperature of voltage transformer during operation for data are more comprehensive directly perceived. When the circuit has faults of short circuit, overload, overheating and the like, open circuit protection is implemented, communication and control over an external circuit can be achieved through the RS485 communication module and the alarm module, real-time alarm and other operations can be carried out, the stability and reliability of the system are improved, and the influence on the whole electrical system is reduced.

(2) The utility model discloses set up the human-computer interaction device after for each item operation is more directly perceived simple, and the processing structure of also can be convenient acquireing each item data is obtained to the input of realization each item data that operating personnel can be convenient for troubleshooting and fault handling efficiency.

(3) The utility model discloses comprehensive protection device, compact structure, reasonable in design, the practicality is strong, convenient to popularize and use.

Drawings

Fig. 1 is an overall schematic block diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.

Examples

As shown in fig. 1, the utility model discloses a voltage transformer integrated protection device, including single chip microcomputer controller, the signal input detection module who links to each other with single chip microcomputer controller and voltage transformer to and storage module, the signal output feedback module who links to each other with single chip microcomputer controller.

The signal input detection module comprises an analog-to-digital conversion module, a photoelectric isolator and a relay which are connected with the single chip microcomputer controller, a current detection module, a voltage detection module and a temperature detection module which are connected with the analog-to-digital conversion module, an active filter which is connected with the current detection module, the voltage detection module and the temperature detection module, a switch analog input module which is connected with the photoelectric isolator and a switch analog input module which is connected with the relay; wherein the active filter is connected with the voltage transformer. The current detection module, the voltage detection module and the temperature detection module are used for monitoring and protecting the voltage, the current and the temperature of the voltage transformer in real time during working, so that data are more comprehensive and visual. When the circuit has faults of short circuit, overload, overheating and the like, open circuit protection is implemented, communication and control over an external circuit can be achieved through the RS485 communication module and the alarm module, real-time alarm and other operations can be carried out, the stability and reliability of the system are improved, and the influence on the whole electrical system is reduced. In the embodiment, the single chip microcomputer controller adopts AT89C51, which is a low-voltage and high-performance CMOS 8-bit single chip microcomputer produced by ATMEL corporation in the united states, and includes a 4k bytes programmable and electrically erasable read only memory < pemom) and a 28bytes random access memory < RAM), and a general 8-bit central processing unit and a FLASH memory unit are built in the chip, so that the single chip microcomputer controller has strong functions, can be used in many high-cost-performance application occasions, and can be flexibly applied to various control fields. The current detection module adopts a MAX471 chip produced by Maxim company, can simply realize current conversion by using the earth as a reference point by using a resistor, and can work in a wider voltage range. Possess perfect high-end current monitoring function, inside contains accurate inside monitoring resistance, and in operating range, the precision is 2%. The voltage detection module adopts an AD736 chip, and is mainly characterized by high accuracy, good sensitivity < 200mVRMS full scale), fast measurement rate, good frequency characteristic < the working frequency range can reach 0-460 kHz), high input impedance, low output impedance, wide power supply range and low power consumption, wherein the maximum power supply working current is 200 muA, and the comprehensive error of measuring sine wave voltage by using the voltage detection module is not more than +/-3%. The temperature detection module adopts a digital temperature transmitter MAX6674 produced by Maxim company.

The signal output feedback module comprises an alarm device, an RS485 communication module, a wireless communication module and a human-computer interaction device which are all connected with the single-chip microcomputer controller. The man-machine interaction device comprises a control chip connected with the single-chip microcomputer controller, and an LCD display device and an input keyboard which are connected with the control chip. The model of the control chip is P89C51RD2 FA.

Through the design, the utility model discloses a comprehensive protection device can carry out real-time supervision to voltage transformer's operating condition, can in time learn when ensureing that voltage transformer breaks down, reaches the quick elimination trouble and influences, improves electrical system operating stability's effect. Therefore, the method has high use value and popularization value.

The above embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the protection scope of the present invention, but all the insubstantial changes or modifications made in the spirit and the idea of the main design of the present invention, the technical problems solved by the embodiment are still consistent with the present invention, and all should be included in the protection scope of the present invention.

Claims

1. A voltage transformer comprehensive protection device is characterized by comprising a single chip microcomputer controller, a signal input detection module, a storage module and a signal output feedback module, wherein the signal input detection module is connected with the single chip microcomputer controller and a voltage transformer;

2. The comprehensive protection device of the voltage transformer as claimed in claim 1, wherein the signal output feedback module comprises an alarm device, an RS485 communication module, a wireless communication module and a human-computer interaction device which are all connected with the single-chip microcomputer controller.

3. The integrated protection device for voltage transformers according to claim 2, characterized in that the human-computer interaction device comprises a control chip connected with the single-chip microcomputer controller, and an LCD display device and an input keyboard both connected with the control chip.

4. The integrated protection device for the voltage transformer according to claim 3, wherein the type of the single chip microcomputer controller is AT89C 51.

5. The integrated protection device for the voltage transformer according to claim 4, wherein the model of the control chip is P89C51RD2 FA.