CN201867923U - Comprehensive electrical fire monitoring detector - Google Patents

Abstract

The utility model relates to a comprehensive electrical fire monitoring detector which is characterized in that external four-phase leakage current is connected with the input end of a current isolation transmitter; the output pins of the current isolation transmitter are respectively connected with an LM2902A/D acquisition chip, the LM2902A/D acquisition chip is connected with a digital signal processor and a temperature sensor is connected with the digital signal processor; the digital signal processor is connected with a CD4070B logic chip, the output end of the CD4070B logic chip is connected with a TD62001P drive chip and the output end of the TD62001P drive chip is connected with the input end of a relay; externally acquired data is connected with an MAX481 communication chip and the MAX481 communication chip is connected with the digital signal processor; and a clock module, a switching quantity input, a display screen, a keyboard, indicating lamps and a buzzer are connected onto the digital signal processor. By using an expandable multi-channel leakage current and temperature signal acquisition module, a remote signal transmission function is realized, alarm signals are automatically transmitted to the mobile phone of a user in a form of short messages, the user can accurately know the situation of a fire accident in time, and the potential electrical fire hazard caused by current leakage and temperature rise can be avoided.

Description

Comprehensive detector for electric fire protection

Technical field

The utility model relates to a kind of residual current detection alarm device, relates to a kind of comprehensive detector for electric fire protection of digital low-voltage distribution circuit residual current detection alarm specifically.

Background technology

Comprehensive electric fire disaster monitoring sniffer is a kind of protective device that can cut off the protected circuit power supply after the protected circuit leakage current reaches setting value, plays important effect in electric system, is the basis that guarantees power supply reliability.Along with electronic technology and development of computer; the relay protection of electric system has broken through traditional digital protecting relay and simple and easy earth leakage protective device; patent of the present invention is that the electric fire disaster monitoring sniffer of core has multichannel fault current and multiple functions such as temperature monitoring in real time, self diagnosis, failure logging, data communication and the printing of protection event log data with the DSP microprocessor; can implement to draw automatically fault current tracing analysis table; for fault analysis facilitates, and has higher reliability.

The fault current that the electric fire disaster monitoring sniffer can be used in checkout equipment and the factory is a leakage current; Comprise other power load of motor operating loop and factory thereof residual residual current, the temperature monitoring of high power switch on/off switch switch contact is measured the possibility that fire takes place.When electric leakage took place, the electric current of sewing during as the bigger position of resistance, can produce localized hyperthermia in flowing into the earth way, cause near combustible to catch fire, thereby cause fire.In addition, the electric leakage spark in that leakage produces equally also can cause fire.Protect to report to the police by the residual current limit value set and operating fault current and local temperature monitoring and being exported and the fire-fighting interlocked control; Be to prevent that too high touch voltage from remaining in the device of uncorrelated operation circuit in the factory; All fault currents that surpasses a threshold value can directly cause the disconnection of inlet wire side loop, comprise the neutral line, are not more than 0.1s actuation time.

Detector for electric fire protection also adopts the digital supervision technology in addition, monitoring camera-shooting that will be by the configuration of comprehensive detector for electric fire protection be sent to supervision and management center and Urban Fires fire-fighting handling desk with the digital supervision data to carry out network and connects, realization is to emphasis electrical fire happening part multi-angle, three-dimensional monitoring, in case the field condition that the electrical fire fire department can intuitively be understood electrical equipment takes place, can in time adjust electrical fire and handle prediction scheme, to quick and precisely stamping out a fire and the electrical fire culprit is handled and played an important role

Summary of the invention

At having protection and the fire alarm problem that there are residual current in low-voltage circuit equipment and power load now; the utility model proposes a kind of high-performance, high precision detect residual current protecting warning and electrical fire protection to low-voltage distributing line and various low pressure power load device; the fire that causes because of earth fault in the prevention low-voltage distribution system designs; main realize electrical fire protection and warning function, the distribution electrical system is protected comprehensively and effectively thereby form with low-voltage circuit breaker and fuse.

Finishing the concrete technical measures that the foregoing invention purpose taked is: a kind of comprehensive detector for electric fire protection is characterized in that: outside 4 phase leakage currents connect electric current isolating transmitter input end; Electric current isolation transmit output pin connects LM2902 A/D acquisition chip input pin 3 pin, 5 pin, 10 pin, 12 pin respectively.Output pin 1 pin of LM2902 A/D acquisition chip, 7 pin, 8 pin, 14 pin connect digital signal processor, and other 4 road connecting modes are identical; Temperature sensor linking number word signal processor 70 pin, 71 pin, 72 pin, 79 pin; Digital signal processor 29 pin, 30 pin, 31 pin, 32 pin, 33 pin, 34 pin connect 9 pin of CD4070B logic chip, 10 pin, 12 pin, 13 pin, 1 pin, 2 pin.Output terminal 8 pin of CD4070B, 11 pin, 3 pin connect 2 pin of TD62001P chip for driving, 3 pin, 4 pin; Output terminal 15 pin of TD62001P chip for driving, 14 pin, 13 pin connect the relay input end; Outside image data connects 6 pin of MAX481 communication chip, 7 pin, and 1 pin of MAX481 communication, 4 pin are through 8 pin of optocoupler connection digital signal processor, 9 pin; On digital signal processor, connect clock module, switching value input, display screen, keyboard, pilot lamp and hummer.

The beneficial effects of the utility model: 1. by expanding multichannel leakage current and temperature signal collection module, realize the remote signal transfer function, automatically alerting signal is transferred in the user mobile phone with short message mode, make the understanding accident conditions that the user can be promptly and accurately, avoid the electrical fire potential safety hazard that forms because of electric leakage and temperature rise.2. the detector for electric fire protection expansion module can directly be connected with main control unit expansion mouth, can satisfy more multiloop monitoring requirement, safe and convenient.3. the road three-phase and four-line isolating switch of serving as theme, automatic cut-off loop according to circumstances during fault prevents that fire failure from taking place.4. temperature sensor temperature measurement accuracy height is low in energy consumption.5. be the RS485 communication interface, the operator on duty adopts the telecommunication mode can take remote-controlled operation to cut off measures such as the power supply or the scene eliminating accident of sending someone at master station, avoids because supply line transships or earth fault takes place and initiation fire.

Description of drawings

Fig. 1 is the utility model application principle figure;

Fig. 2 is the utility model line electricity signal acquisition circuit schematic diagram;

Fig. 3 is the utility model microcontroller circuit schematic diagram;

Fig. 4 is the utility model logic drive circuit schematic diagram;

Fig. 5 is the utility model temperature acquisition schematic diagram;

Fig. 6 is the utility model application circuit work power supply schematic diagram.

Embodiment

Be further described below in conjunction with drawings and Examples.

A kind of comprehensive detector for electric fire protection, Fig. 1 are electric fire disaster monitoring detection system schematic diagram.1. be the electric fire disaster monitoring main control unit among the figure, can gather multichannel leakage current and temperature signal, by and can expand multichannel leakage current and temperature signal collection module.Built-in SIM300 module can realize the remote signal transfer function, automatically alerting signal is transferred in the user mobile phone with short message mode, makes the understanding accident conditions that the user can be promptly and accurately, avoids the electrical fire potential safety hazard that forms because of electric leakage and temperature rise.2. be the detector for electric fire protection expansion module, can directly be connected, can satisfy more multiloop monitoring requirement, safe and convenient with main control unit expansion mouth.3. the road three-phase and four-line isolating switch of serving as theme, automatic cut-off loop according to circumstances during fault prevents that fire failure from taking place.4. be temperature sensor probe PT1000, be used to survey cable, switch contact and cubicle switch in-cabinet temperature signal monitoring, temperature measurement range is at-200 ℃～+ 650 ℃, and the temperature measurement accuracy height is low in energy consumption.5. the road leakage current monitoring device of serving as theme is used to gather the monitoring of master control circuit residual current, prevents from that the circuit residual current is excessive to have influence on the safe operation of master control power network line.6. be the lower end load, the three-phase breaker lower end can connect electric power consumer unit point of incoming cables that is easy to breaking out of fire etc., important strick precaution scenes such as fiery area illumination consumer unit point of incoming cables can be taken over control in the single-phase circuit breaker lower end, and the lower end can connect fire-fighting link, responds actively after receiving alerting signal.7. being the RS485 communication interface, 8. is digital monitor, all can be connected with total monitoring client, is used for the real-time monitor state of fire monitoring detector.The operator on duty adopts the telecommunication mode can take remote-controlled operation to cut off measures such as the power supply or the scene eliminating accident of sending someone at master station, avoids because supply line transships or earth fault takes place and initiation fire.Reserve the CAN bus interface, can realize multiple communication connected mode.

Combined circuit figure illustrates the connecting relation between each device: Fig. 2 is the residual current collecting part, and outside 8 road leakage currents are imported, and becomes through the linear precision current isolating transmitter of height and send measurement range 10mA～5000 mA; Carry out low-pass filtering again, 2 pin, 3 pin, 5 pin, 6 pin, 9 pin, 10 pin and 12 pin, 13 pin that enter into high precision LM2902A/D acquisition chip are changed and the comparison signal amplification; 32 high-speed microprocessor digital signal processors of DSPTMS320F2802-, carry out the measuring and control data collection and compare numerical value by reading the A/D data in real time, collection calculates corresponding each phase leakage current size, and back 4 tunnel can increase the A/D acquisition chip and finish collection, and principle is identical.Fig. 5 is a temperature sensor collecting temperature circuit diagram, voltage enters into resistance bridge R2.3.4 through voltage stabilizing diode, R2 changes along with variation of temperature, enter into LM2902 and carry out thermal resistance and PT1000(temperature and resistance) amplification ratio, revise non-linear, secondary is transferred to LM2902 and regulates size of amplifying voltage output at the corresponding levels, and zero temperature is adjusted, and at last the signal that collects is transferred to the T1 pin of DSPTMS320F2802 digital signal processor.All the other 3 road temperature acquisition principles are identical, are connected to the T2 of digital signal processor respectively, T3, T4 pin.Fig. 3 is the schematic diagram of DSPTMS320F2802 digital signal processor.Eight road leakage currents that collect are by 1 pin, 7 pin, 8 pin, 14 pin of first LM2902 chip, 1 pin of second LM2902,7 pin, 8 pin, 14 pin are connected to 23 pin, 22 pin, 21 pin, 20 pin, 19 pin, 18 pin, 17 pin of DSPTMS320F2802 digital signal processor, and the real formula of finishing the electric leakage collection reads; 70 pin, 71 pin, 72 pin, 79 pin that the temperature that collects enters into signal processor compare numerical value, calculate the temperature of corresponding each phase leakage current and each phase after, send on the display screen video data amount in real time to by display module; The DSPTMS320F2802 digital signal processor compares according to the data message of real-time collection and the alarm and protection parameter area that sets.As shown in Figure 4, surpass the alarm and protection parameter area that sets when the charge value of real-time collection, 29 pin of DSPTMS320F2802 digital signal processor, 30 pin, 31 pin, 32 pin, 33 pin, 34 pin connection CD4070B logic chip, 1 pin, 2 pin, 9 pin, 10 pin, 12 pin, 13 pin carry out the control of electric signal logical and, and pull-up resistor is 10K; 2 pin, 3 pin, 4 pin that output pin 3 pin of CD4070B logic chip, 8 pin, 11 pin are connected to the TD62001P chip for driving carry out control signal and export 13 pin, 14 pin, 15 pin; 13 pin of TD62001P chip for driving, 14 pin, 15 pin directly connect the relay input end and realize control output.8 pin of DSPTMS320F2802 digital signal processor, 9 pin are the communication interface pin, when outside and main frame carries out exchanges data, 6 pin and 7 pin of MAX481 communication chip carry out the collection of data message, be transferred to by optocoupler in 8 pin, 9 pin of message handler and carry out exchanges data, finish communication part.6 pin, 7 pin are CAN bus communication pin, can directly connect the CAN bus communication module.81 pin, 82 pin are the switch acquisition pin.5 pin, 100 pin connect high precision SD2303API clock chip, finish the clock part of signal processor.43 pin drive through triode and connect hummer and LED light, finish the acousto-optic voice warning function.

Fig. 6 is the device power supply; according to a conventional method AC/DC220V voltage is provided the two-way working power of DC12 V and DC9V to device through the transformation rectification; the power supply of safety and stability is provided for A/D discharge circuit, digital signal processor, communicating circuit and protection control circuit; increased 560VF/450V electric capacity; can play the effect of delay cut-off; after equipment loses power supply because of reasons such as fire failures, can guarantee operate as normal in 20s, still can send alerting signal accurately.

Claims (1)

1. a comprehensive detector for electric fire protection is characterized in that: outside 4 phase leakage currents connection electric current isolating transmitter input end; Electric current isolation transmit output pin connects LM2902 A/D acquisition chip input pin 3 pin, 5 pin, 10 pin, 12 pin respectively; Output pin 1 pin of LM2902 A/D acquisition chip, 7 pin, 8 pin, 14 pin connect digital signal processor, and other 4 road connecting modes are identical; Temperature sensor linking number word signal processor 70 pin, 71 pin, 72 pin, 79 pin; Digital signal processor 29 pin, 30 pin, 31 pin, 32 pin, 33 pin, 34 pin connect 9 pin of CD4070B logic chip, 10 pin, 12 pin, 13 pin, 1 pin, 2 pin; Output terminal 8 pin of CD4070B, 11 pin, 3 pin connect 2 pin of TD62001P chip for driving, 3 pin, 4 pin; Output terminal 15 pin of TD62001P chip for driving, 14 pin, 13 pin connect the relay input end; Outside image data connects 6 pin of MAX481 communication chip, 7 pin, and 1 pin of MAX481 communication, 4 pin are through 8 pin of optocoupler connection digital signal processor, 9 pin; On digital signal processor, connect clock module, switching value input, display screen, keyboard, pilot lamp and hummer.

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