CN202268749U - Intelligent security monitoring device for box transformer substation - Google Patents

Abstract

The utility model relates to an intelligent safety monitoring device for a box-type substation, which comprises a protection measurement and control single-chip microcomputer. The input terminals of the protection measurement and control single-chip microcomputer are respectively connected with a transformer plug-in board, an adjustment circuit, a FLASH storage module, a watchdog and an RTC clock module, and the output terminals are respectively connected with the There are wireless GPRS communication module, wired RS485 communication module, man-machine display microcontroller and relay outlet plug-in. It has integrated protection, measurement, control, monitoring, and communication functions. At the same time, considering the outdoor closed ground installation, it is easy to cause flashover accidents due to condensation due to temperature and humidity. Adding temperature measurement and control functions will destroy the condensation generation environment. ; And add security anti-theft and smoke alarm functions. In terms of networking communication, RS485 and GPRS/GSM communication technologies are adopted, which can realize remote wireless communication, and truly realize the intelligent and unattended requirements of box-type substations.

Description

Box transformer intelligent safety monitoring device

Technical field:

The utility model relates to an intelligent safety monitoring device for a box-type substation, which is suitable for safety monitoring of a large-capacity box-type substation with a voltage level of 35kV-10kV/0.4kV.

Background technique:

The box-type substation is a miniaturized power distribution equipment that combines high-voltage switches, transformers and low-voltage power distribution equipment in a box according to a certain wiring scheme. With the development of society and economy, more and more attention is paid to environmental greening in urban planning and construction, and residential quarters are also increasingly developing in a garden style. And other considerations, but also consider the coordination with the surrounding environment. In view of this, pole-mounted distribution transformers are basically not used in the distribution network transformation of residential quarters, and power distribution rooms are difficult to promote due to reasons such as difficult site selection and large floor space. Box-type transformers are small in size, beautiful in appearance, and Advantages such as short installation period have been rapidly promoted and adopted.

Utility model content:

The utility model provides an intelligent safety monitoring device for a box-type substation, which has integrated functions of protection, measurement, control, monitoring, and communication, adds a temperature measurement and control function, destroys the condensation generating environment, and adds safety anti-theft and smoke alarm functions. In terms of network communication, remote wireless communication can be realized, which truly realizes the intelligent and unattended requirements of the box-type substation.

In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: the intelligent safety monitoring device of the box transformer includes a protection measurement and control single-chip microcomputer, and the input terminals of the protection measurement and control single-chip microcomputer are respectively connected with a transformer plug-in board, an adjustment circuit, a FLASH storage module and a watchdog and RTC clock module, the output end is respectively connected with wireless GPRS communication module, wired RS485 communication module, man-machine display single-chip microcomputer and relay outlet plug-in. the

An SPI communication module is arranged between the protection measurement and control single-chip microcomputer and the man-machine display single-chip microcomputer. the

The man-machine display single-chip microcomputer is connected with an input module. the

The protection measurement and control microcontroller is dsPIC33FJ256GP710. the

The man-machine display microcontroller is PIC24FJ32GA004. the

Compared with the prior art, the utility model has the following advantages and effects:

1. Telemetry function: external analog AC input, used to collect three-phase measured voltage, zero-sequence voltage, three-phase measured current, and zero-sequence current of the incoming line on the high-voltage side of the box-type transformer, and three-phase measured voltage and three-phase measured current of the outgoing line on the low-voltage side . On this basis, the measurement and monitoring of active power, reactive power, apparent power, power factor and frequency are realized;

2. Remote signaling function: digital input, real-time monitoring of high and low voltage measuring switch position signals, as well as anti-theft and smoke information;

3. Remote control function: It can control the incoming line switch and outgoing line switch of the box transformer to realize remote control operation.

4. Harmonic detection function: Real-time sampling of voltage and current of each circuit, various harmonic analysis operations, and analysis results, such as harmonic components of each order, etc. the

5. Electric energy measurement and rate management function: it can record the electric energy value of each circuit and each phase, and provide reference for electricity charge measurement. the

6. Temperature and humidity monitoring function: DC analog quantity acquisition. It can realize the temperature monitoring of the three-phase winding of the transformer, the monitoring of the ambient temperature and humidity of the high and low voltage rooms, and the monitoring of the environmental humidity of the transformer room. And it can turn on the fan and heater load according to the ambient temperature and humidity information, adjust the internal environment of the box transformer, and ensure the normal operation of various components inside the box transformer. Environmental requirements

Description of drawings:

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the circuit principle diagram of " wired communication " interface of the present utility model;

Fig. 3 is the schematic diagram of the remote signaling binary input circuit of the present invention;

Fig. 4 is the schematic diagram of the relay output circuit of the present invention;

Fig. 5 is the circuit principle diagram of " watchdog and RTC clock " of the present utility model;

Fig. 6 is a structural diagram of the "wireless communication" of the utility model.

In the figure: 1- protection measurement and control microcontroller; 2- transformer plug-in board; 3- adjustment circuit; 4- FLASH storage module; 5- watchdog and RTC clock; 6- wireless GPRS communication module; 7- wired RS485 communication module; 8-Man-machine display microcontroller; 9-relay outlet plug-in; 10-input module; 11-SPI communication module. the

Detailed ways:

Referring to Fig. 1, the intelligent safety monitoring device for a box-type substation includes a protection measurement and control single-chip microcomputer 1, the single-chip microcomputer of the protection measurement and control single-chip microcomputer 1 is dsPIC33FJ256GP710, and the input terminal of the protection measurement and control single-chip microcomputer 1 is respectively connected with a transformer plug-in board 2, an adjustment circuit 3, a FLASH storage module 4 and Watchdog and RTC clock module 5, the output end is respectively connected with wireless GPRS communication module 6, wired RS485 communication module 7, man-machine display single-chip microcomputer 8 and relay outlet plug-in 9, described man-machine display single-chip microcomputer 8 is connected with input module 10. An SPI communication module 11 is arranged between the protection measurement and control single-chip microcomputer 1 and the man-machine display single-chip microcomputer 8. The man-machine display single-chip microcomputer 8 is a PIC24FJ32GA004. There are 16 analog AC signals input on the transformer plug-in board 2, and the adjustment circuit 3 There are 8 channels of flow signals in the input, 14 channels of output signals are output on the relay outlet plug-in 9, and 10 channels of binary input signals are input at the input of the protection measurement and control single-chip microcomputer 1, and the above-mentioned modules are all prior art.

The protection, measurement and control single-chip microcomputer of the present utility model adopts the dsPIC33FJ256GP710 single-chip microcomputer of 16-bit MICROCHIP company, and its interior has included a variety of traditional external circuits, such as clock generator, I/O port, 12-bit 32-way A/D converter, direct memory access DMA, PWM, serial port, timer/counter, watchdog timer, high-speed input/output, peripheral transaction server PTS, waveform generator, on-chip flash memory and SRAM, etc. The biggest feature of this microcontroller is high-performance DSP instructions, 24-bit wide instructions, linear storage space that can address a maximum of 4M instruction words, two 40-bit accumulators, 16*16-bit multipliers, and accumulator write-back operations for DSP operations. Double data fetching operation speeds up the ability of data exchange and modification, improves the throughput of single-chip CPU, and is very suitable for real-time collection, processing, storage and transmission of multi-channel data. the

The man-machine display single-chip microcomputer adopts the single-chip microcomputer PIC24FJ32GA004 as the control core, and the display adopts 192*64 large LCD, and the Chinese character display adopts a special font chip, which provides a standard font library with beautiful, uniform and professional fonts; friendly man-machine interface, full Chinese menu; the panel adopts LED The lights display various status, protection, alarm, fault and other information; and 8 button operations are convenient for users to check the running status, primary data, fault information and setting parameters;

The protection, measurement and control single-chip microcomputer adopts 16-bit single-chip microcomputer dsPIC33FJ256GP710 as the control core, uses high-performance voltage and current transformers, and simultaneously monitors 16 channels of AC voltage, current and 8 channels of ambient temperature and humidity. The DMA method is used internally to collect 24 AC and DC flows to meet the rapidity and selectivity requirements of box-type transformer protection;

For the application environment of the box transformer, according to the signal transmitted by the temperature and humidity sensor, when the temperature is higher than the upper limit, the fan is started to cool down. When the temperature is lower than the lower limit, the heater starts. When the humidity is greater than the threshold value, start the fan to dehumidify, and the temperature and humidity sensors are connected to the DC input module in Figure 1 for collection;

There are smoke detectors and access control sensors inside the box transformer, which transmit the level signal, and the on-site operation signal can be transmitted to the user's computer and mobile phone by means of wireless communication and SMS.

Referring to Fig. 2, the mode adopted by the RS485 limited communication interface of the utility model is the RS-485 half-duplex bus mode. The bus mode is simple and convenient, and the multi-bus connection mode is adopted to realize the multi-point bus structure. Through the external expansion communication module, it can be connected with various communication networks such as EtherNet and CAN; in order to reduce line interference, each communication mode is isolated by the optical isolation chip TLP521. The bus mode adopts the full-duplex RS485 drive receiver MAX1487E module of MAXIAM Company, which has strong drive capability and a communication distance of up to 1200 meters. It can network up to 255 devices and communicate with the host computer serially to realize telemetry, remote signaling and remote control functions. . Increased automation of power distribution systems. the

Referring to Fig. 3, the position status of the utility model's remote signal collection isolating switch, load switch and fuse is known by detecting the position signal of its special auxiliary contact or signal relay contact; safety anti-theft and smoke alarm belong to Fig. 1, the sub-module of the 10-way binary input module, the safety and anti-theft is known by monitoring the auxiliary contact position signal of the access control travel switch; the smoke alarm module is known by monitoring the alarm auxiliary contact signal of the smoke sensor. The remote signal input circuit is shown in Figure 3 below. The T-type RC low-pass filter can filter out the high-frequency interference of the remote signal circuit; the resistors R1 and R2 play the role of current limiting protection, and the diode plays the role of protecting the optocoupler. the

Referring to Fig. 4, all protection functions of the utility model are finally realized by controlling the action of circuit breakers and load switches through the output control unit. Therefore, the reliability of the output control circuit directly reflects the system reliability of its monitoring system. The output quantity control circuit adopts the transistor to drive the contact relay. In order to improve the anti-interference ability, the traditional remote signal output circuit must be photoelectrically isolated. In addition, when the outlet trips, GPIO0 and GPIO1 of the CPU arrange different level outputs, GPIO0 outputs "0", GPIO1 outputs "1", so that the NAND gate Y2 outputs "0" to drive the light-emitting diode. This design can prevent the short-term misoperation of the relay K1 during the process of pulling and closing the DC power supply. Because when the DC power is pulled and closed, and the CPU is powered on and reset at the same time, both GPIO0 and GPIO1 are output at the same level, and it is impossible to drive the light-emitting diodes, thus preventing misoperation. the

Referring to Fig. 5, the "watchdog" reset and low-voltage monitoring circuit 9 of the utility model selects the FM31L278 chip of RAMTRON Company, and is connected with the single-chip microcomputer 1 through the I2C bus, which has real-time clock, low-voltage reset, watchdog counter, early Voltage failure alarm function, the high integration of the chip not only saves the cost, but also greatly improves the reliability of the system. the

Referring to Fig. 6, the GPRS module in the utility model is a part of the wireless communication in the device. In order to use the GPRS network for communication, the terminal must select appropriate equipment to access the GPRS network. It connects with the protection CPU processor through star communication, and completes the connection with the GPRS network under its control, so as to realize the data mutual transmission with the host computer. the

When working, the intelligent safety monitoring device of the box-type transformer converts the primary side PT and CT system signals into voltage signals, which are rectified and filtered and output to the AC sampling circuit, and then input to the internal A/D sampling interface of the microcontroller 1 after passing through the signal conditioning circuit. The working status of the utility model is as follows:

1. The utility model is powered on and works normally, the panel is running, and the communication 232 light is flashing normally, the communication 232 indicates the normal communication between the protection CPU and the wireless module, and the wireless module is detected. When there is a fault or an alarm message occurs, the wireless module sends a short message to the target mobile phone number, normal When running, the high-voltage room and low-voltage room in the box-type substation are sent to the upper computer through the GPRS network to exchange primary voltage, current, power, frequency and other data information.

2. When the utility model is working normally, data information such as primary side AC voltage, current, power frequency and other data information can be monitored in real time through the wired communication network RS485, and the protection pressure plate throwing and retreating, protection setting value and parameters can be set. the

3. When the utility model is working normally, it can monitor the ambient temperature and humidity of the high-pressure chamber and the low-pressure chamber, and can adjust the ambient temperature and humidity through loads such as fans and heaters. the

4. The 10-way digital input module 6 can be used to monitor the status of various running switches in the box transformer in real time, as well as the smoke sensor and access control information. When an abnormality occurs, the user can be notified by SMS; Various running information; users can set the arming and disarming of the access control through SMS. the

5. When an abnormality is detected in the three-phase protection current signal on the primary side of the box-type transformer, if the protection is switched on, the system compares the current detection value with the timing limit value, inverse time limit value, Analyze and compare the parameters such as the fixed time setting value, and when the set parameters are exceeded, a trip signal is sent through the relay output circuit 9, and the user is notified of the fault information by short message. the

Claims (4)

1. case becomes the intelligent safety monitoring device; Comprise protection observing and controlling single-chip microcomputer (1); It is characterized in that: protection observing and controlling single-chip microcomputer (1) input is connected to instrument transformer card (2), adjustment circuit (3), FLASH memory module (4) and house dog and RTC clock module (5) respectively, and output is connected to wireless GPRS communication module (6), wired RS485 communication module (7), man-machine display single-chip microcomputer (8) and relay outlet plug-in unit (9) respectively.

2. a kind of case according to claim 1 becomes the intelligent safety monitoring device, it is characterized in that: be provided with SPI communication module (11) between said protection observing and controlling single-chip microcomputer (1) and the man-machine display single-chip microcomputer (8).

3. a kind of case according to claim 1 and 2 becomes the intelligent safety monitoring device, it is characterized in that: be connected with input module (10) on the described man-machine display single-chip microcomputer (8).

4. a kind of case according to claim 3 becomes the intelligent safety monitoring device, and it is characterized in that: said protection observing and controlling single-chip microcomputer (1) is dsPIC33FJ256GP710.

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