CN111220866B

CN111220866B - Measurement and control device, method and equipment for detecting working state of current transformer

Info

Publication number: CN111220866B
Application number: CN201911414236.9A
Authority: CN
Inventors: 涂震东; 胡怡; 刘建荣; 张颖非; 黎建彪
Original assignee: Guangdong Power Grid Co Ltd; Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Current assignee: Guangdong Power Grid Co Ltd; Huizhou Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2022-04-19
Anticipated expiration: 2039-12-31
Also published as: CN111220866A

Abstract

The embodiment of the invention relates to a measurement and control device, a method and equipment for detecting the working state of a current transformer, wherein the voltage and the working voltage of the current transformer are acquired through the current transformer, the two voltages of the acquired voltage and the working voltage are processed by an analog-digital conversion unit and a micro control unit, the micro control unit controls a display unit to display the processed voltage and the working state, the current is calculated according to the voltage acquired by display and is compared with the leakage current displayed by the insulation monitoring device in a direct current system, the working state of a feeder branch in the direct current system is obtained, and the monitoring accuracy of the current transformer is increased; the monitoring device does not need to be manually put into a feeder branch for inspection, and a worker can identify the working state of the current transformer, so that a fault current transformer is found out, the feeder branch with a fault in a direct current system is identified, and the working efficiency is improved. The problems of inaccurate detection and low detection working efficiency caused by abnormal CT in the conventional direct current system are solved.

Description

Measurement and control device, method and equipment for detecting working state of current transformer

Technical Field

The invention relates to the technical field of power equipment, in particular to a measurement and control device, a method and equipment for detecting the working state of a current transformer.

Background

The existing direct current system generally comprises an alternating current input, a rectification module, a feed output, a storage battery pack, an insulation monitoring device and the like, wherein the feed output is mainly used for outputting a plurality of direct current branches for supplying equipment; the direct current system of the transformer substation provides a direct current power supply for protecting, measuring and controlling power equipment such as emergency lighting and the like, and the safety and reliability of the direct current system directly influence the operation of the power system. In order to monitor the safe and reliable operation of the direct current system, whether abnormal conditions such as grounding, alternating current channeling and the like occur in the feed output is judged through an insulation monitoring device of the direct current system.

In the process of monitoring the direct current system by adopting the insulation monitoring device, the leakage current of the feed output of the direct current system is measured by a direct Current Transformer (CT), the leakage current measured by the CT is calculated by the insulation monitoring device, and the working state of the feed output in the direct current system is judged. However, the following problems are easily caused in the existing insulation monitoring device:

firstly, the leakage current calculated by the insulation monitoring device is inaccurate due to the poor wiring condition of the CT, and the risk of false alarm or missing alarm is possibly generated due to the alarm value of the grounding resistor arranged in the insulation monitoring device, so that the risk of operation of a direct current system is increased;

secondly, the disconnection condition occurs in the CT, for example, the CT is not grounded, and at this time, the insulation monitoring device does not send any alarm signal, and the fault of the dc system can be found only by starting the manual inspection, so that a large amount of manpower and material resources are required to be input, and the working efficiency is low.

Therefore, how to improve the accuracy and the detection efficiency of CT detection becomes an important technical problem to be solved urgently by those skilled in the art.

Disclosure of Invention

The embodiment of the invention provides a measurement and control device, a method and equipment for detecting the working state of a current transformer, which are used for solving the technical problems of inaccurate detection and low detection working efficiency caused by the abnormity of a CT in the conventional direct current system.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

a measurement and control device for detecting the working state of a current transformer is applied to a direct current system and comprises a monitoring device and the current transformer clamped and arranged on a shell of the monitoring device, wherein the monitoring device is used for monitoring the working state of the current transformer and is connected with the current transformer, and the monitoring device comprises a micro-control unit, and a power supply unit, an analog-to-digital conversion unit and a display unit which are connected with the micro-control unit;

the current transformer is used for collecting the voltage of a feeder line branch on the direct current system and recording the voltage as collected voltage, and the current transformer is connected with the analog-to-digital conversion unit and transmits the collected voltage and the working voltage of the current transformer to the analog-to-digital conversion unit;

the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the acquisition voltage and the working voltage to obtain an acquisition voltage digital signal and a working voltage digital signal;

the micro control unit is used for circularly processing the acquired voltage digital signal and the working voltage digital signal to obtain a first voltage and a first output signal corresponding to the acquired voltage digital signal and a second voltage and a second output signal corresponding to the working voltage digital signal;

the display unit is used for displaying the first voltage and the second voltage, displaying the working state of the feeder line branch circuit through the first output signal and displaying the working state of the current transformer through the second output signal.

Preferably, after a channel of the micro control unit is configured each time, the analog-to-digital conversion unit is started to read the acquisition voltage and the working voltage for conversion, and the acquisition voltage and the working voltage are transmitted to the micro control unit for processing and displaying, so that the acquisition voltage digital signal and the working voltage digital signal are subjected to cyclic processing.

Preferably, the micro control unit is an STM32 single chip microcomputer.

Preferably, the display unit is an indicator light, a nixie tube or a display screen; determining that the display unit displays the working state of the feeder line branch and the working state of the current transformer according to the on or off of a lamp displayed by the indicator lamp; and displaying the output voltage according to the nixie tube or the display screen.

Preferably, a clamping fixing block for fixing the current transformer is arranged on a shell of the monitoring device.

The invention also provides a measurement and control method for detecting the working state of the current transformer, which is used for the measurement and control device for detecting the working state of the current transformer and comprises the following steps:

s1, acquiring the acquisition voltage of a feeder line branch on the direct current system and the working voltage of a current transformer through the current transformer;

s2, performing analog-to-digital conversion on the acquisition voltage and the working voltage through an analog-to-digital conversion unit to obtain an acquisition voltage digital signal and a working voltage digital signal;

s3, performing cyclic processing on the acquisition voltage digital signal and the working voltage digital signal through a micro control unit to obtain a first voltage and a first output signal corresponding to the acquisition voltage digital signal and a second voltage and a second output signal corresponding to the working voltage digital signal;

and S4, displaying the first voltage and the second voltage through a display unit, displaying the working state of the feeder line branch according to the first output signal, and displaying the working state of the current transformer according to the second output signal.

Preferably, the display unit is an indicator light, a nixie tube or a display screen, and the working state of the feeder line branch and the working state of the current transformer are displayed by the display unit according to the on or off of a light displayed by the indicator light; and displaying the output voltage according to the nixie tube or the display screen.

The invention also provides a measurement and control device for detecting the working state of the current transformer, which comprises a processor and a memory;

the memory is used for storing program codes and transmitting the program codes to the processor;

and the processor is used for executing the measurement and control method for detecting the working state of the current transformer according to the instruction in the program code.

According to the technical scheme, the embodiment of the invention has the following advantages:

1. the measurement and control device for detecting the working state of the current transformer acquires voltage and working voltage of the current transformer, the analog-digital conversion unit and the micro control unit are adopted to process the acquired voltage and the working voltage, the micro control unit controls the display unit to display the processed voltage and the working state, the current is calculated according to the insulation monitoring device in the direct current system by displaying the acquired voltage and is compared with the displayed leakage current, and the working state of a feeder branch in the direct current system is obtained, so that the monitoring accuracy of the current transformer is improved; the monitoring device does not need to be manually put into a feeder branch for inspection, and a worker can identify the working state of the current transformer, so that a fault current transformer is found out, the feeder branch with a fault in a direct current system is identified, and the working efficiency is improved. The technical problems that the detection is inaccurate and the detection work efficiency is low due to the abnormity of the CT in the conventional direct current system are solved;

2. according to the measurement and control method for detecting the working state of the current transformer, the collected voltage and the working voltage of the current transformer are processed by the aid of the analog-digital conversion unit and the micro control unit, the micro control unit controls the display unit to display the processed voltage and the working state, the displayed and collected voltage is compared with the current calculated by the insulation monitoring device in the direct-current system to obtain the working state of a feeder branch in the direct-current system, and accordingly monitoring accuracy of the current transformer is improved; the monitoring device does not need to be manually put into a feeder branch for inspection, and a worker can identify the working state of the current transformer, so that a fault current transformer is found out, the feeder branch with a fault in a direct current system is identified, and the working efficiency is improved. The technical problems that the detection is inaccurate and the detection work efficiency is low due to the fact that the CT is abnormal in the existing direct current system are solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a measurement and control device for detecting a working state of a current transformer according to an embodiment of the present invention.

Fig. 2 is a frame diagram of a measurement and control device for detecting an operating state of a current transformer according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a current transformer of a measurement and control device for detecting a working state of the current transformer according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of another angle of the measurement and control device for detecting the working state of the current transformer according to the embodiment of the present invention.

Fig. 5 is a flowchart illustrating steps of a measurement and control method for detecting a working state of a current transformer according to an embodiment of the present invention.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the application provides a measurement and control device, a method and equipment for detecting the working state of a current transformer, which are used for solving the technical problems of inaccurate detection and low detection working efficiency caused by the abnormity of a CT in the conventional direct current system.

The first embodiment is as follows:

fig. 1 is a schematic structural diagram of a measurement and control device for detecting a working state of a current transformer according to an embodiment of the present invention, and fig. 2 is a frame diagram of the measurement and control device for detecting a working state of a current transformer according to an embodiment of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a measurement and control device for detecting a working state of a current transformer, which is applied to a dc system, and includes a monitoring device 10 and a current transformer 20 clamped and arranged on a housing of the monitoring device 10, where the monitoring device 10 is used to monitor the working state of the current transformer 20, the monitoring device 10 is connected to the current transformer 20, and the monitoring device 10 includes a micro control unit 11, and a power supply unit 12, an analog-to-digital conversion unit 13, and a display unit 14 connected to the micro control unit 11;

the current transformer 20 is configured to collect a voltage of a feeder line branch on the dc system and record the voltage as a collected voltage, and the current transformer 20 is connected to the analog-to-digital conversion unit 13 to transmit the collected voltage and a working voltage of the current transformer to the analog-to-digital conversion unit 13;

the analog-to-digital conversion unit 13 is configured to perform analog-to-digital conversion on the acquisition voltage and the working voltage to obtain an acquisition voltage digital signal and a working voltage digital signal;

the micro control unit 11 is configured to perform cyclic processing on the collected voltage digital signal and the working voltage digital signal to obtain a first voltage and a first output signal corresponding to the collected voltage digital signal and a second voltage and a second output signal corresponding to the working voltage digital signal;

the display unit 14 is configured to display the first voltage and the second voltage, and display the working state of the feeder branch via the first output signal and display the working state of the current transformer via the second output signal.

In the embodiment of the present invention, the micro control unit 11 is an STM32 single chip microcomputer. The display unit 14 is an indicator light, a nixie tube or a display screen.

It should be noted that, be provided with the several passageways on the STM32 singlechip. Wherein, two channels of an STM32 singlechip are used for connecting the analog-to-digital conversion unit 13. And determining that the display unit 14 displays the working state of the feeder branch and the working state of the current transformer 20 according to the on or off of the light displayed by the indicator light. And displaying the output first voltage and the second voltage according to the nixie tube or the display screen. The indicator light can be a diode, and can also be a light-emitting device such as an LED lamp bead.

In the embodiment of the present invention, the power supply unit 12 is mainly used for supplying power to the micro control unit 11, the analog-to-digital conversion unit 13 and the display unit.

In an embodiment of the invention, as shown in fig. 3, the acquisition voltage V is₁The current of the feeder line branch on the direct current system is detected through the current transformer 20, and the collected voltage finally reflects the current of the feeder line branch on the direct current system after the processing of the current transformer 20. The working voltage V₂Refers to the voltage of the current transformer 20 during normal operation.

It should be noted that the current transformer 20 needs an external power supply to supply power to the current transformer, and the determination is made according to the working voltage, under a normal condition, the current transformer 20 needs an external voltage of 24V to operate, and if the working voltage is displayed at about 24V, the CT normally operates.

In this embodiment, the analog-to-digital conversion unit may be simply referred to as ADC.

In the embodiment of the invention, the working voltage and the acquisition voltage are firstly transmitted to the analog-to-digital conversion unit for analog-to-digital conversion, the generated digital acquisition voltage digital signal and the working voltage digital signal of digital quantity are transmitted to an STM32 single chip microcomputer for processing, the working voltage and the acquisition voltage are circularly processed through a program, the processed voltage is transmitted to a nixie tube by the STM32 single chip microcomputer for display, and the STM32 single chip microcomputer simultaneously outputs signals to enable corresponding indicator lamps to be lightened while displaying the corresponding voltage.

It should be noted that, when the nixie tube displays the working voltage, the working indicator light is on, and the collecting indicator light is off; when the nixie tube displays the acquisition voltage, the working indicating lamp is turned off, and the acquisition indicating lamp is turned on.

The measurement and control device for detecting the working state of the current transformer provided by the invention collects voltage and working voltage of the current transformer, and processes the collected voltage and the working voltage by adopting the analog-digital conversion unit and the micro control unit, the micro control unit controls the display unit to display the processed voltage and the working state, the current is calculated by the displayed collected voltage according to the insulation monitoring device in the direct current system and is compared with the displayed leakage current, and the working state of a feeder branch in the direct current system is obtained, so that the monitoring accuracy of the current transformer is increased; the monitoring device does not need to be manually put into a feeder branch for inspection, and a worker can identify the working state of the current transformer, so that a fault current transformer is found out, the feeder branch with a fault in a direct current system is identified, and the working efficiency is improved. The technical problems that the detection is inaccurate and the detection work efficiency is low due to the fact that the CT is abnormal in the existing direct current system are solved.

In an embodiment of the present invention, after configuring a channel of the micro control unit each time, the analog-to-digital conversion unit is started to read the acquisition voltage and the working voltage for conversion, and the acquisition voltage and the working voltage are transmitted to the micro control unit for processing and displaying, so as to implement cyclic processing on the acquisition voltage digital signal and the working voltage digital signal.

It should be noted that, specifically, the STM32 single chip microcomputer cyclically acquires the acquisition voltage and the working voltage which are acquired by the analog-to-digital conversion unit 13, and in order to ensure that cyclic acquisition output is realized, discontinuous conversion is realized by the analog-to-digital conversion unit 13; after the STM32 single chip microcomputer is configured with one channel each time, the analog-to-digital conversion unit 13 needs to be restarted, the data of the collected voltage and the working voltage is read for conversion, and the data is transmitted to the STM32 single chip microcomputer for processing and displaying; and then, starting another channel, restarting the analog-to-digital conversion unit 13, reading the data of the collected voltage and the working voltage again, transmitting the data to an STM32 single chip microcomputer, processing the data of the collected voltage and the working voltage to obtain processed data, and displaying the processed data by the display unit 14.

Specifically, {0xfc, 0x60, 0xda, 0xf2, 0x66, 0xb6, 0xbe, 0xe0, 0xf6, 0xee, 0x3e, 0x9c, 0x7a, 0x9e, 0x8e }; code for # nixie tube.

{

I/O port initialization

RCC- > APB2ENR | ═ 1< < 2; // enabling PORTA Port clock

RCC- > APB2ENR | ═ 1< < 4; // enabling PORTC Port clock

GPIOA- > CRL & ═ 0XFFF 0000; // PA01 setting two input channels of ADC

RCC- > APB2ENR | ═ 1< < 9; // ADC1 clock Enable

RCC- > APB2RSTR | ═ 1< < 9; // ADC1 reset

RCC- > APB2RSTR & (1< < 9); // reset end

RCC- > CFGR & (3< < 14); // division factor zero clearing

12M ADC clock setting/SYSCLK/DIV 2, ADC max clock cannot exceed 14M! // otherwise would result in reduced ADC accuracy!

RCC->CFGR|＝2<<14；

ADC1- > CR1& ═ 0XF0 FFFF; // operating mode clear

ADC1- > CR1| -0 < < 16; // independent mode of operation

2ADC1- > CR1| ═ 1< < 8; // scanning mode

ADC1- > CR2| ═ 1< < 1; // enabling continuous switching

ADC1- > CR2| -1 < < 8; // enabling DMA

v/ADC 1- > CR2& (1< <1 >); // single conversion mode

ADC1->CR2&＝～(7<<17)；

ADC1- > CR2| ═ 7< < 17; // software controlled switching

ADC1- > CR2| -1 < < 20; // use with external trigger (SWSTART)! | A | A Must use an event to trigger

ADC1- > CR2& (1< < 11); v/Right alignment

ADC1->SQR1&＝～(0XF<<20)；

ADC1- > SQR1| ═ 5< < 20; //2 conversions in a regular sequence

ADC1->SQR3＝0X00000000；

ADC1->SQR3|＝0X1EE18820；

Setting sampling time of channels 0-3, 14, 15

ADC1- > SMPR2& ═ 0XFFFFF 000; // channel 0, 1 sample time clearing

ADC1- > SMPR2| -7 < < 3; // channel 1239.5 period, increasing the sampling time may increase accuracy

4ADC1- > SMPR2| ═ 7< < 0; // channel 0239.5 period, increasing the sampling time may increase accuracy

ADC1- > CR2| ═ 1< < 0; // turn on AD converter

ADC1- > CR2| ═ 1< < 3; // enable reset calibration

while (ADC1- > CR2&1< < 3); // wait for calibration to end

// this bit is set by software and cleared by hardware. This bit will be cleared after the calibration register is initialized.

ADC1- > CR2| ═ 1< < 2; // turn on AD calibration

while (ADC1- > CR2&1< < 2); // wait for calibration to end

// this bit is set by software to start calibration and cleared by hardware at the end of calibration

}

void MYDMA_Config(DMA_Channel_TypeDef*DMA_CHx，u32 cpar，u32cmar，u16 cndtr)

{

u32 DR _ Base; if buffering, it is not necessary to know why

RCC- > AHBENR | ═ 1< < 0; // starting DMA1 clock

DR_Base＝cpar；

DMA _ CHx- > CPAR — DR _ Base; // DMA1 peripheral Address

DMA _ CHx- > CMAR ═ (u32) CMAR; // DMA1, memory address

DMA1_ MEM _ LEN ═ cndtr; v/saving DMA transfer data amount

DMA _ CHx- > CNDTR ═ CNDTR; // DMA1, amount of data transferred

DMA _ CHx- > CCR ═ 0X 00000000; // reset

DMA _ CHx- > CCR | ═ 1< < 1; // allow transfer complete interrupt

DMA _ CHx- > CCR | -, 0< < 4; // read from the peripheral

DMA _ CHx- > CCR | -, 1< < 5; // cycle mode

DMA _ CHx- > CCR | -, 0< < 6; // peripheral address non-incremental mode

DMA _ CHx- > CCR | -, 1< < 7; // memory increment mode

DMA _ CHx- > CCR | ═ 1< < 8; // peripheral data width 16 bits

DMA _ CHx- > CCR | -, 1< < 10; // memory data width 16 bits

DMA _ CHx- > CCR | -, 1< < 12; // medium priority

DMA _ CHx- > CCR | -, 0< < 14; // non-memory to memory mode

MY_NVIC_Init(1，3，DMA1_Channel1_IRQChannel，2)；

}

V/starting one DMA transfer

void MYDMA_Enable(DMA_Channel_TypeDef*DMA_CHx)

{

DMA _ CHx- > CCR & - (1< < 0); // close DMA transfer

DMA _ CHx- > CNDTR ═ DMA1_ MEM _ LEN; // DMA1, amount of data transferred

DMA _ CHx- > CCR | -, 1< < 0; // starting DMA transfer

}

u16ADC1_DR，adcx；

void DMAChannel1_IRQHandler(void)

{

u16 i；

u32 sum[6]＝{0}，val＝0；

LED0＝！LED0；

ADC1- > CR2& (1< < 1); // turn off continuous transition

The program is an execution code of an STM32 singlechip for circularly processing the acquired voltage digital signal and the working voltage digital signal, and the program code is installed to circularly process the acquired voltage digital signal and the working voltage digital signal.

As shown in fig. 4, fig. 4 is a schematic structural diagram of another angle of the measurement and control device for detecting the working state of the current transformer according to the embodiment of the present invention.

In an embodiment of the present invention, a clamping fixing block 15 for fixing the current transformer 20 is disposed on a housing of the monitoring device 10.

It should be noted that the clamping fixing blocks 15 are disposed on two sides of the housing of the monitoring device 10, and the two clamping fixing blocks 15 limit the installation space position of the current transformer 20. Specifically, the clamping fixing block 15 is fixedly connected with the current transformer 20 through a fastener 101. Wherein the fastener 101 is preferably a screw. The design CT of the snap-in mounting block 15 ensures that the monitoring devices 10 correspond one-to-one to the current transformers 20.

Example two:

As shown in fig. 5, an embodiment of the present invention provides a measurement and control method for detecting a working state of a current transformer, which is used for the measurement and control device for detecting a working state of a current transformer, and includes the following steps:

It should be noted that the micro control unit is an STM32 single chip microcomputer. The display unit is an indicator light, a nixie tube or a display screen. The STM32 singlechip is provided with a plurality of channels. Wherein, two channels of STM32 singlechip have been used in being connected with the analog-to-digital conversion unit. And determining that the display unit displays the working state of the feeder line branch and the working state of the current transformer according to the on or off of the lamp displayed by the indicator lamp. And displaying the output first voltage and the second voltage according to the nixie tube or the display screen. The indicator light can be a diode, and can also be a light-emitting device such as an LED lamp bead. Specifically, the working voltage and the acquisition voltage are firstly transmitted to the analog-to-digital conversion unit for analog-to-digital conversion, the generated digital acquisition voltage digital signal and the working voltage digital signal of the digital quantity are transmitted to an STM32 single chip microcomputer for processing, the working voltage and the acquisition voltage are circularly processed through a program, the STM32 single chip microcomputer transmits the processed voltage to a nixie tube for display, and the STM32 single chip microcomputer simultaneously outputs signals to enable corresponding indicator lights to be lightened while displaying the corresponding voltage.

In the embodiment of the present invention, in the step S3, after configuring a channel of the micro control unit each time, the analog-to-digital conversion unit is started to read the acquisition voltage and the working voltage for conversion, and the acquisition voltage and the working voltage are transmitted to the micro control unit for processing and displaying, so as to implement cyclic processing on the acquisition voltage digital signal and the working voltage digital signal.

It should be noted that, the STM32 single chip microcomputer cyclically acquires the acquisition voltage and the working voltage passing through the analog-to-digital conversion unit 13, and in order to ensure that cyclic acquisition output is realized, discontinuous conversion is realized by the analog-to-digital conversion unit 13; after the STM32 single chip microcomputer is configured with one channel each time, the analog-to-digital conversion unit 13 needs to be restarted, the data of the collected voltage and the working voltage is read for conversion, and the data is transmitted to the STM32 single chip microcomputer for processing and displaying; and then, starting another channel, restarting the analog-to-digital conversion unit 13, reading the data of the collected voltage and the working voltage again, transmitting the data to an STM32 single chip microcomputer, processing the data of the collected voltage and the working voltage to obtain processed data, and displaying the processed data by the display unit 14.

In the embodiment of the present invention, in step S4, the display unit is an indicator light, a nixie tube or a display screen, and the display unit is determined to display the working state of the feeder branch and the working state of the current transformer according to on or off of a light displayed by the indicator light; and displaying the output voltage according to the nixie tube or the display screen.

According to the measurement and control method for detecting the working state of the current transformer, the voltage and the working voltage of the current transformer are collected through the current transformer, the two voltages of the collected voltage and the working voltage are processed by the analog-digital conversion unit and the micro control unit, the micro control unit controls the display unit to display the processed voltage and the working state, the current is calculated according to the insulation monitoring device in the direct current system by displaying the collected voltage, the current is compared with the displayed leakage current, the working state of a feeder branch in the direct current system is obtained, and therefore the monitoring accuracy of the current transformer is improved; the monitoring device does not need to be manually put into a feeder branch for inspection, and a worker can identify the working state of the current transformer, so that a fault current transformer is found out, the feeder branch with a fault in a direct current system is identified, and the working efficiency is improved. The technical problems that the detection is inaccurate and the detection work efficiency is low due to the fact that the CT is abnormal in the existing direct current system are solved.

Example three:

the embodiment of the invention provides a measurement and control device for detecting the working state of a current transformer, which comprises a processor and a memory, wherein the processor is used for processing the working state of the current transformer;

a memory for storing the program code and transmitting the program code to the processor;

and the processor is used for executing the measurement and control method for detecting the working state of the current transformer according to the instructions in the program codes.

It should be noted that, the processor is configured to execute the above-mentioned steps in an embodiment of a measurement and control device for detecting an operating state of a current transformer according to instructions in the program code, for example, steps S1 to S4 shown in fig. 5. Alternatively, the processor, when executing the computer program, implements the functions of the modules/units in the above-described device embodiments, such as the functions of the units 11 to 14 shown in fig. 2.

Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in a memory and executed by a processor to accomplish the present application. One or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of a computer program in a terminal device.

The terminal device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor, a memory. Those skilled in the art will appreciate that the terminal device is not limited and may include more or fewer components than those shown, or some components may be combined, or different components, e.g., the terminal device may also include input output devices, network access devices, buses, etc.

The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The storage may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal device. Further, the memory may also include both an internal storage unit of the terminal device and an external storage device. The memory is used for storing computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store data that has been output or is to be output.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a device (which may be a personal computer, a server, or a network device) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A measurement and control device for detecting the working state of a current transformer is applied to a direct current system and is characterized by comprising a monitoring device and the current transformer clamped and arranged on a shell of the monitoring device, wherein the monitoring device is used for monitoring the working state of the current transformer and is connected with the current transformer, and the monitoring device comprises a micro-control unit, and a power supply unit, an analog-to-digital conversion unit and a display unit which are connected with the micro-control unit;

the display unit is used for displaying the first voltage and the second voltage, displaying the working state of the feeder line branch circuit through the first output signal and displaying the working state of the current transformer through the second output signal;

and after a channel of the micro control unit is configured each time, the analog-to-digital conversion unit is started to read the acquisition voltage and the working voltage for conversion, and the acquisition voltage and the working voltage are transmitted to the micro control unit for processing and displaying so as to realize the cyclic processing of the acquisition voltage digital signal and the working voltage digital signal.

2. The measurement and control device for detecting the working state of the current transformer as claimed in claim 1, wherein the micro control unit is an STM32 single chip microcomputer.

3. The measurement and control device for detecting the working state of the current transformer as claimed in claim 1, wherein the display unit is an indicator light, a nixie tube or a display screen.

4. The measurement and control device for detecting the working state of the current transformer according to claim 3, wherein the display unit is determined to display the working state of the feeder branch and the working state of the current transformer according to on or off of a lamp displayed by the indicator light;

and displaying the output voltage according to the nixie tube or the display screen.

5. The measurement and control device for detecting the working state of the current transformer according to claim 1, wherein a clamping fixing block for fixing the current transformer is arranged on a shell of the monitoring device.

6. A measurement and control method for detecting the working state of a current transformer, which is used for the measurement and control device for detecting the working state of the current transformer according to any one of claims 1 to 5, comprises the following steps:

s4, displaying the first voltage and the second voltage through a display unit, displaying the working state of the feeder line branch according to the first output signal, and displaying the working state of the current transformer according to the second output signal;

7. The measurement and control method for detecting the working state of a current transformer according to claim 6, wherein the display unit is an indicator light, a nixie tube or a display screen, and the working state of the feeder line branch and the working state of the current transformer are displayed by the display unit according to on or off of a light displayed by the indicator light; and displaying the output voltage according to the nixie tube or the display screen.

8. A measurement and control device for detecting the working state of a current transformer is characterized by comprising a processor and a memory;

the processor is configured to execute the measurement and control method for detecting the working state of the current transformer according to claim 6 or 7 according to instructions in the program code.