CN203759822U - Residual electric current type electrical fire hazard monitoring detector - Google Patents
Residual electric current type electrical fire hazard monitoring detector Download PDFInfo
- Publication number
- CN203759822U CN203759822U CN201320363500.2U CN201320363500U CN203759822U CN 203759822 U CN203759822 U CN 203759822U CN 201320363500 U CN201320363500 U CN 201320363500U CN 203759822 U CN203759822 U CN 203759822U
- Authority
- CN
- China
- Prior art keywords
- circuit
- mcu
- electric current
- fire
- residual current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Alarm Systems (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a residual electric current type electrical fire hazard monitoring detector. Hardware of the electrical fire hazard monitoring detector comprises an MCU, a clock circuit, an EEPROM storage circuit, a press key circuit, a liquid crystal display circuit, a sound alarm circuit, a state indicating lamp circuit, a power source voltage detection circuit, a residual electric current detection unit, an over electric current detection circuit, a two bus communication circuit, a 24 V forced switching input circuit, a trip unit, a self-check circuit and an output out-point, wherein the residual electric current detection unit is used for converting electric current signals of a detected residual electric current into voltage signals, the voltage signals are sent into an MCU circuit and are processed, and liquid crystal display of a leakage electric current value is realized; when the leakage electric current value exceeds a preset value, an alarm is sent by the sound alarm circuit, the trip unit is controlled by the MCU through the output out-point to cut off a main return circuit power source, and therefore electrical fire hazard accidents can be prevented.
Description
Technical field
The utility model relates to a kind of residual current type detector for electric fire protection, relates in particular to the wherein design of residual current detection unit.
Background technology
According to relevant departments statistics, in recent years in all kinds of fire failures, the ratio of electrical fire is every year all more than 30%, serious harm national wealth and people's life safety.The fire that wherein electric short circuit causes accounts for the over half of whole electrical fire, and it is the main cause of electrical fire accident.Electric short circuit has two kinds of modes: 1, the direct contact short circuit of wire.Comprise between phase line, the short circuit between phase line and the neutral line.Because the impedance of short-circuit loop is very little, this class short-circuit current moment reaches thousands of amperes, but the large electric current of this class short circuit can impel short-circuit protector snap action disengagement failure power supply, thereby avoids the generation of this class electrical fire.2, electric arc short circuit is mainly that the electric arc between energized conductor is on fire, earth fault and creepage on fire.Compare with first kind short circuit; because arc impedance is larger; the electric arc leakage current less (" electric leakage " generic term is in the world " residual current ") that causes this class short circuit to cause; make short-circuit protector be difficult to timely action; but due to the leakage current of hundreds of mA make Local Instantaneous temperature up to 2000 ℃～4000 ℃; be enough to ignite combustible around and cause electrical fire, so electric arc short circuit is the main target of electric fire disaster monitoring.
Utility model content
Deficiency in view of prior art existence, technical problem to be solved in the utility model is to provide a kind of simple in structure, can Real-Time Monitoring leakage current and the threephase load state of surplus circuit, find timely electric leakage, overload, short circuit, the problem such as under-voltage the residual current type detector for electric fire protection of accurately reporting to the police.
For solving the problems of the technologies described above, the utility model provides a kind of residual current type detector for electric fire protection, cuts by force input circuit 12, output contact 13, trip unit 14, self-checking circuit 15 formed by MCU1, clock circuit 2, EEPROM memory circuit 3, key circuit 4, liquid crystal display circuit 5, audible alarm circuit 6, status indicator lamp circuit 7, voltage detection circuit 8, residual current detection unit 9, overcurrent sensing circuit 10, double bus communicating circuit 11,24V.Described clock circuit 2, EEPROM memory circuit 3, key circuit 4, liquid crystal display circuit 5, audible alarm circuit 6, status indicator lamp circuit 7, voltage detection circuit 8, residual current detection unit 9, overcurrent sensing circuit 10, double bus communicating circuit 11,24V cut by force input circuit 12, output contact 13, self-checking circuit 14 and are all electrically connected with MCU1.
Described residual current detection unit consists of residual current transformer, sampling resistor, commutation diode, voltage signal amplifying circuit and voltage stabilizing zeroing circuit, and the voltage signal of residual current detection unit output is input to the imported conversion of 10 voltages mouthful P1.6 of MCU.
Described double bus communicating circuit is connected with full duplex serial communication interface P3.0, the P3.1 of MCU, and double bus communication unit adopts C-MBUS bus communication special chip CMT001.
Described trip unit connects MCU by output contact, and trip unit consists of the isolating switch with the separated electrical apparatus release of electromagnetism.
Described MCU adopts STC 12C5A16S2ADJ40.
The utlity model has positive effect: monitoring detector of the present utility model can be to electric leakage, overload, short circuit, under-voltage etc. carry out comprehensive monitoring and intelligent analysis and send sound and light alarm by liquid crystal display, when feed circuit generation electrical hazard, monitoring detector can be pinpointed the problems timely and accurately be reported to the police, remind in time staff to check fault, get rid of contingent electric hidden danger, Accident prevention occurs.
Monitoring detector of the present utility model can store alarms record, and alarm logging power down is not lost, and can inquire about at any time.This detector also has input warning function, can cut by force input circuit by 24V and connect fire-fighting system alarm module output signal, realizes automatic cut-off loop power supply.This detector adopts C-MBUS bus communication circuit, the status informations such as electric leakage, overcurrent, fire-fighting, normal operation can be sent to upper level electrical fire monitoring device.
Accompanying drawing explanation:
Fig. 1 is general structure block diagram of the present utility model.
Fig. 2 is the circuit theory diagrams of residual current detection unit.
Embodiment:
As Fig. 1, the utility model residual current type detector for electric fire protection comprises: comprise that MCU1, clock circuit 2, EEPROM memory circuit 3, key circuit 4, liquid crystal display circuit 5, audible alarm circuit 6, status indicator lamp circuit 7, voltage detection circuit 8, residual current detection unit 9, overcurrent sensing circuit 10, double bus communicating circuit 11,24V cut by force input circuit 12, output contact 13, trip unit 14, self-checking circuit 15.
As Fig. 2, described residual current detection unit consists of residual current transformer, sampling resistor, commutation diode, voltage signal amplifying circuit and voltage stabilizing zeroing circuit, wherein R3, R4 are sampling resistor, D1 is commutation diode, resistance R 2, R5, capacitor C 4, amplifier LM358 form voltage signal amplifying circuit, and diode D2, capacitor C 5, slide rheostat VR1 form voltage stabilizing zeroing circuit.The no-load voltage ratio that residual current transformer carries out the leakage current of electrical equipment circuit 1000: 1 converts little current signal to, through sample resistance R4, the residual current signal of 0mA～1mA is converted to the interchange small voltage signal of 0 V～0.1V, through commutation diode, become direct current small voltage signal again, through overvoltage signal amplifying circuit, be converted to again the voltage signal of 0 V～3V, finally by voltage stabilizing zeroing circuit, be input to the imported conversion of 10 voltages mouthful P1.6 of MCU.
Key circuit 4 is connected with the input port of MCU, can realize self check, reset, the selection of leakage current alarm parameters, set of time, query note, fire-fighting power supply function is set.
Condition indication circuit 7 is connected with the delivery outlet of MCU, the running status of place phase and protected circuit when 6 pilot lamp show respectively generation overload or short circuit: fault, electric leakage, operation.
Audible alarm circuit 6 is connected with the delivery outlet of MCU, under alarm condition, provides audible alarm, manually by ventil, carries out noise reduction, while having new warning, can again sound.
Described liquid crystal display circuit 5 is connected with the delivery outlet of MCU, in real time displaying time, supply voltage, leakage current, threephase load state, report to the police setting and state.
Trip unit 14 connects MCU by output contact 13, when occurring to report to the police, the output signal of MCU is through the relay output of output contact 13, make the electromagnet band electric attraction armature of trip unit 14, by gear train, promote free off-line feature to cut off main circuit power.
24V cuts by force input circuit 12 input ends and connects fire-fighting system alarm module, output terminal connects MCU, when fire-fighting system alarm module has the output of the DC24V of triggering voltage signal, 24V cuts by force input circuit input end and receives this voltage signal, by MCU, make again the actuating of relay of output contact 13, control trip unit 14 and cut off main circuit power, to avoid the generation of electrical fire accident.
The clock circuit 2 consisting of DS1302, the EEPROM memory circuit 3 consisting of chip 24C256 are connected with the I/O port of MCU respectively, be used for preserving alarm logging and system clock is provided.
Described double bus communicating circuit 11 consists of chip XY001A and optocoupler PC817, is connected with MCU communication interface, the status informations such as electric leakage, overcurrent, fire-fighting, normal operation can be sent to upper level electrical fire monitoring device.
Press " self check " button, self-checking circuit 15 work, main frame can detect A phase, B phase, C phase and detection of electrical leakage circuit successively, by liquid crystal display and pilot lamp, shown respectively, chimes of doom interruption is sounded, detection line corresponding to the bright expression of run indicator is normal, and when detection line has fault, malfunction indicator lamp is bright.If there is no chimes of doom, illustrate that alarm sound circuit has fault.
The model that described MCU adopts is STC 12C5A16S2ADJ40.
Claims (7)
1. a residual current type detector for electric fire protection, comprises MCU, clock circuit, EEPROM memory circuit, key circuit, liquid crystal display circuit, audible alarm circuit, status indicator lamp circuit, voltage detection circuit, residual current detection unit, overcurrent sensing circuit, double bus communicating circuit, 24V cuts by force input circuit, output contact, trip unit, self-checking circuit, is characterized in that: MCU is the structure centre of this fire disaster monitoring alarm, described residual current detection unit, excessive current detection unit, double bus communicating circuit, 24V cuts by force input circuit and is arranged on MCU around and is connected with the communication interface of MCU, and described residual current detection unit is by residual current transformer, sampling resistor, commutation diode, voltage signal amplifying circuit and voltage stabilizing zeroing circuit form, and the voltage signal of residual current detection unit output is input to 10 voltages imported conversion mouthful of MCU, and described electrical fire-detector collection detects, report to the police and line disconnection functions, effectively prevent that electrical fire from occurring, compact overall structure, size is less, connects easily, easy for installation.
2. according to claim 1, it is characterized in that: described residual current detection unit consists of residual current transformer, sampling resistor, commutation diode, voltage signal amplifying circuit and voltage stabilizing zeroing circuit, in described residual current detection unit, resistance R 2, R5, capacitor C 4, amplifier LM358 form voltage signal amplifying circuit, and diode D2, capacitor C 5, slide rheostat VR1 form voltage stabilizing zeroing circuit.
3. according to claim 1, it is characterized in that: described 24V cuts by force input circuit input end and is connected in fire-fighting module, output terminal is connected to the input end of MCU, when fire-fighting module triggers, described 24V cuts by force input circuit and can control trip unit by MCU and cut off the electricity supply, to avoid the generation of electrical fire accident.
4. according to claim 1, it is characterized in that: double bus communicating circuit adopts C-MBUS bus communication special chip CMT001, the status informations such as electric leakage, overcurrent, fire-fighting, normal operation can be sent to upper level electrical fire monitoring device.
5. according to claim 1, it is characterized in that: the output terminal of key circuit is connected with the input end of MCU, can realize fire detector self check, reset, the selection of leakage current alarm parameters, set of time, query note, fire-fighting power supply function is set.
6. according to claim 1, it is characterized in that: MCU connects trip unit by output contact, trip unit consists of the isolating switch with the separated electrical apparatus release of electromagnetism.
7. it is characterized in that according to claim 1: described MCU adopts STC 12C5A16S2ADJ40.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320363500.2U CN203759822U (en) | 2013-06-24 | 2013-06-24 | Residual electric current type electrical fire hazard monitoring detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320363500.2U CN203759822U (en) | 2013-06-24 | 2013-06-24 | Residual electric current type electrical fire hazard monitoring detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203759822U true CN203759822U (en) | 2014-08-06 |
Family
ID=51255070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320363500.2U Expired - Fee Related CN203759822U (en) | 2013-06-24 | 2013-06-24 | Residual electric current type electrical fire hazard monitoring detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203759822U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128058A (en) * | 2016-08-18 | 2016-11-16 | 无锡蓝天电子股份有限公司 | A kind of fire alarm control unit of band detection earth fault function |
| CN106802622A (en) * | 2017-04-06 | 2017-06-06 | 江苏国电格朗电气科技有限公司 | Fire-fighting equipment power supply smart comprehensive monitoring system based on bus structures |
| CN107179492A (en) * | 2017-07-03 | 2017-09-19 | 北京航天常兴科技发展股份有限公司 | The resistive electric leakage electrical fire monitoring detection device of on-line insulation monitoring formula |
| CN108535581A (en) * | 2017-03-02 | 2018-09-14 | 公安部沈阳消防研究所 | A kind of integrated experiment device of residual current type detector for electric fire protection |
| CN108896810A (en) * | 2018-09-18 | 2018-11-27 | 国网青海省电力公司检修公司 | Security alarm device |
| CN109507528A (en) * | 2018-11-15 | 2019-03-22 | 国网山西省电力公司大同供电公司 | A kind of 10kV overhead transmission line lightning-caused breaking warning device based on fault current detection |
| CN112180283A (en) * | 2020-09-02 | 2021-01-05 | 深圳市伊力科电源有限公司 | Fire alarm system and uninterrupted power source |
-
2013
- 2013-06-24 CN CN201320363500.2U patent/CN203759822U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128058A (en) * | 2016-08-18 | 2016-11-16 | 无锡蓝天电子股份有限公司 | A kind of fire alarm control unit of band detection earth fault function |
| CN108535581A (en) * | 2017-03-02 | 2018-09-14 | 公安部沈阳消防研究所 | A kind of integrated experiment device of residual current type detector for electric fire protection |
| CN106802622A (en) * | 2017-04-06 | 2017-06-06 | 江苏国电格朗电气科技有限公司 | Fire-fighting equipment power supply smart comprehensive monitoring system based on bus structures |
| CN107179492A (en) * | 2017-07-03 | 2017-09-19 | 北京航天常兴科技发展股份有限公司 | The resistive electric leakage electrical fire monitoring detection device of on-line insulation monitoring formula |
| CN107179492B (en) * | 2017-07-03 | 2023-10-13 | 北京航天常兴科技发展股份有限公司 | On-line insulation monitoring type resistive leakage electric fire monitoring and detecting device |
| CN108896810A (en) * | 2018-09-18 | 2018-11-27 | 国网青海省电力公司检修公司 | Security alarm device |
| CN109507528A (en) * | 2018-11-15 | 2019-03-22 | 国网山西省电力公司大同供电公司 | A kind of 10kV overhead transmission line lightning-caused breaking warning device based on fault current detection |
| CN112180283A (en) * | 2020-09-02 | 2021-01-05 | 深圳市伊力科电源有限公司 | Fire alarm system and uninterrupted power source |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203759822U (en) | Residual electric current type electrical fire hazard monitoring detector | |
| CN101316037B (en) | Aftercurrent action protector with self-diagnostic function | |
| CN201229642Y (en) | Electric fire disaster detector | |
| CN207180888U (en) | A kind of cable temperature monitoring device with alarm and power down function | |
| CN204215514U (en) | A kind of fire hazard monitoring power distribution cabinet | |
| CN111293527A (en) | Safety socket and socket system | |
| CN201094134Y (en) | Residual current operation protector with self-diagnostic function | |
| CN204633463U (en) | Double-power controller | |
| CN200941545Y (en) | Fire-proof electricity leakage protector | |
| CN201044352Y (en) | Intelligent minitype breaker | |
| CN201274072Y (en) | Electric facility approach prohibition net for safety | |
| CN204536414U (en) | A kind of low-voltage network residual current monitoring system | |
| CN205123418U (en) | Intelligent distribution box | |
| CN202025406U (en) | Residual current type electric fire monitoring detector | |
| CN111403968A (en) | Safety socket and socket assembly | |
| CN201789266U (en) | Electric leakage monitoring circuit for electrical appliance device | |
| CN211719901U (en) | Safety socket and socket assembly | |
| CN211719900U (en) | Safety socket and socket system | |
| CN211015788U (en) | Visual single-machine circuit of secondary screen cabinet alarm signal of transformer substation | |
| CN202178560U (en) | Intelligent electric safety monitoring system | |
| CN113161990A (en) | Safe power supply system | |
| CN202351367U (en) | Electric insulation leakage analyzer of building | |
| CN202939760U (en) | Multifunctional electrical fire monitoring detector | |
| CN104901415A (en) | Double-power-supply centralized control device | |
| CN207717948U (en) | Fire-fighting equipment power self test circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20180624 |