CN105513253A - Low-voltage distribution cabinet fire alarm system - Google Patents

Low-voltage distribution cabinet fire alarm system Download PDF

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Publication number
CN105513253A
CN105513253A CN201610121171.9A CN201610121171A CN105513253A CN 105513253 A CN105513253 A CN 105513253A CN 201610121171 A CN201610121171 A CN 201610121171A CN 105513253 A CN105513253 A CN 105513253A
Authority
CN
China
Prior art keywords
residual current
current
temperature sensor
plc
type detector
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.)
Pending
Application number
CN201610121171.9A
Other languages
Chinese (zh)
Inventor
赵广轩
刘贵勤
王猛
葛强
张丽
侯海岩
孟艳
樊兆晴
管鑫
杨子恒
邢瑞芹
单金玲
陈雪峰
刘婷婷
李兰珍
张爱君
仝艳红
张纯岭
仝燕萍
李伟伟
董维群
张广波
张豪杰
张甜
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Shandong Electric Power Company Yuncheng Power Supply Co
Heze Power Supply Co of State Grid Shandong Electric Power Co Ltd
Original Assignee
State Grid Shandong Electric Power Company Yuncheng Power Supply Co
Heze Power Supply Co of State Grid Shandong Electric Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by State Grid Shandong Electric Power Company Yuncheng Power Supply Co, Heze Power Supply Co of State Grid Shandong Electric Power Co Ltd filed Critical State Grid Shandong Electric Power Company Yuncheng Power Supply Co
Priority to CN201610121171.9A priority Critical patent/CN105513253A/en
Publication of CN105513253A publication Critical patent/CN105513253A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00Fire alarms; Alarms responsive to explosion
    • G08B17/06Electric actuation of the alarm, e.g. using a thermally-operated switch

Abstract

A low-voltage distribution cabinet fire alarm system comprises a temperature sensor, a current transformer, a first residual current acting breaker and a first residual current type electrical fire monitor detector, the current transformer sleeves an incoming end of the first residual current acting breaker, a first output end of the temperature sensor is connected with a temperature signal input end of the first residual current type electrical fire monitor detector, a second output end of the temperature sensor passes through a first current amplifier and is then connected with a signal input end of a PLC (programmable logic controller), a current signal output end of the first residual current type electrical fire monitor detector passes through a second current amplifier and is then connected with a signal input end of the first residual current acting breaker. Fire alarm accuracy can be improved, fire alarming may be carried out for multiple low-voltage control cabinets through the PLC for the purpose of extended application, and thus cost reduction and central control can be achieved.

Description

Low-voltage distribution cabinet fire alarm system
Technical field
The present invention relates to a kind of fire alarm installation, belong to operation power safety guard, particularly relate to a kind of low-voltage distribution cabinet fire alarm system.
Background technology
Low-voltage distribution cabinet refers to that various isolating switch is equipped with in inside, the parts such as protector, rated voltage is the distribution system of 380v, as power, the electric energy conversion of illumination and distribution and control, the effect of control and protection end consumer can be played, swap switch can be closed when maintenance to keep in repair, when spread of voltage or the situations such as overload that are short-circuited, switch also can disconnect automatically, protection consumer is not burned, strong because having breaking capacity, dynamic thermal stability is good, electrical arrangement draws flexibly, the features such as combined and instant, at intelligent grid, constructing and implementing of infrastructure, manufacture field etc. are widely applied.
In current rural power grids upgrading and daily distribution management, in low pressure is safeguarded, there is a different difficult problem.Owing to showing under conditions, rural electricity consumption load continues to increase, because the excessive heating of immediate current increases and the existence of leakage current, is easy to cause low-voltage distribution cabinet generation electrical fire, causes burning power distribution equipment and electrical equipment.At present, the fire hazard monitoring system of low-voltage distribution cabinet, current transformer and the residual current type detector for electric fire protection of adopting coordinates realization, because current transformer is subject to the impact of surrounding electric field more, be subject to fire the problem of false alarm, so be badly in need of the accuracy improving its fire monitoring.
Summary of the invention
The invention provides a kind of low-voltage distribution cabinet fire alarm system, in order to solve defect of the prior art.
In order to realize object of the present invention, by the following technical solutions:
Low-voltage distribution cabinet fire alarm system, comprise temperature sensor, current transformer, first residual current action breaker and the first residual current type detector for electric fire protection, described current transformer is set in the end of incoming cables of the first residual current action breaker, described temperature sensor first output terminal is connected with the temperature signal input of the first residual current type detector for electric fire protection, its second output terminal connects the signal input part of PLC after the first current amplifier, the current signal output end of described first residual current type detector for electric fire protection connects the signal input part of PLC after the second current amplifier, the signal output part of described PLC connects the input end of the first residual current action breaker.
In order to realize object of the present invention further, can also by the following technical solutions:
Reservoir in described PLC can store the current value of temperature sensor sampling last time, for comparing with the current value of temperature sensor sampling next time, 1 is defined as when the current value of temperature sensor sampling next time is greater than the current value of sampling last time, otherwise be 0, simultaneously, storer in PLC stores current value last time that the first residual current type detector for electric fire protection inputs, for comparing with the current value next time of the first residual current type detector for electric fire protection input, 0 is defined as when current value last time of the first residual current type detector for electric fire protection input is less than the current value of sampling next time, otherwise be 1, the numerical value that temperature sensor residual current type detector for electric fire protection obtains respectively compares by described PLC again, when being 1, output alarm control signal, its remainder values is normal.Described first residual current action breaker end of incoming cables is arranged in parallel the second residual current action breaker, and the leading-out terminal of the second residual current action breaker is serially connected with the second residual current type detector for electric fire protection.Described temperature sensor is thermistor temperature sensor.The signal output part of described PLC connects audible-visual annunciator.Described temperature sensor is provided with 2-4.
Beneficial effect of the present invention:
1, the temperature sensor arranged in the present invention is except monitoring for the temperature variation of switch board, the fire alarm also caused as the leakage current change obtained current transformer verifies, namely can be stored the current value of temperature sensor sampling last time by the reservoir in PLC, for comparing with the current value of temperature sensor sampling next time, 1 is defined as when the current value of temperature sensor sampling next time is greater than the current value of sampling last time, otherwise be 0, simultaneously, storer in PLC stores current value last time that the first residual current type detector for electric fire protection inputs, for comparing with the current value next time of the first residual current type detector for electric fire protection input, 0 is defined as when current value last time of the first residual current type detector for electric fire protection input is less than the current value of sampling next time, otherwise be 1, the numerical value that temperature sensor residual current type detector for electric fire protection obtains respectively compares by described PLC again, when being 1, output alarm control signal, its remainder values is normal.By the temperature variation of temperature sensor and the leakage current change contrast of the first residual current type detector for electric fire protection, when leakage current, switch board temperature all exceed fire forecast police threshold values, when both all show as rising, send alerting signal, avoid at leakage current because there is fluctuation under the impact of electric field, and cause fire alarm to report by mistake.
The fire alarm that 2, can carry out multiple low-voltage power distributing cabinet by PLC carries out expanded application, and then can reduce costs, centralized control, improves the accuracy of fire alarm.
Accompanying drawing explanation
Fig. 1 is electrical schematic diagram of the present invention.
Fig. 2 is control principle drawing of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1-2, low-voltage distribution cabinet fire alarm system, comprise temperature sensor, current transformer, first residual current action breaker and the first residual current type detector for electric fire protection, described current transformer is set in the end of incoming cables of the first residual current action breaker, described temperature sensor first output terminal is connected with the temperature signal input of the first residual current type detector for electric fire protection, its second output terminal connects the signal input part of PLC after the first current amplifier, the current signal output end of described first residual current type detector for electric fire protection connects the signal input part of PLC after the second current amplifier, the signal output part of described PLC connects the input end of the first residual current action breaker.
Specifically, the temperature sensor arranged in the present embodiment is except monitoring for the temperature variation of switch board, the fire alarm also caused as the leakage current change obtained current transformer verifies, namely can be stored the current value of temperature sensor sampling last time by the reservoir in PLC, for comparing with the current value of temperature sensor sampling next time, 1 is defined as when the current value of temperature sensor sampling next time is greater than the current value of sampling last time, otherwise be 0, simultaneously, storer in PLC stores current value last time that the first residual current type detector for electric fire protection inputs, for comparing with the current value next time of the first residual current type detector for electric fire protection input, 0 is defined as when current value last time of the first residual current type detector for electric fire protection input is less than the current value of sampling next time, otherwise be 1, the numerical value that temperature sensor residual current type detector for electric fire protection obtains respectively compares by described PLC again, when being 1, output alarm control signal, its remainder values is normal.By the temperature variation of temperature sensor and the leakage current change contrast of the first residual current type detector for electric fire protection, when leakage current, switch board temperature all exceed fire forecast police threshold values, when both all show as rising, send alerting signal, avoid at leakage current because there is fluctuation under the impact of electric field, and cause fire alarm to report by mistake.
As shown in Figure 1, the present embodiment is arranged in parallel the second residual current action breaker in described first residual current action breaker end of incoming cables, and the leading-out terminal of the second residual current action breaker is serially connected with the second residual current type detector for electric fire protection.Arrange the second residual current type detector for electric fire protection can increase the individual event leakage current monitoring in three-phase current, and improved the safe running performance of power distribution cabinet by the second residual current action breaker.
Further, temperature sensor described in the present embodiment is thermistor temperature sensor.The change of thermistor to power distribution cabinet environment temperature has better measurement effect, and its appreciable temperature variation can realize within 0.1 DEG C.Temperature sensor is provided with 2-4, the temperature variation can reacting power distribution cabinet inside is more accurately live, can improve the accuracy of temperature acquisition.The signal output part of described PLC connects audible-visual annunciator.PLC connects audible-visual annunciator, when can constantly rise in temperature or raise fast in temperature, forecasts in advance, and then can preferably by fire failure prevention process.
The fire alarm that the present invention can carry out multiple low-voltage power distributing cabinet by PLC carries out expanded application, and then can reduce costs, centralized control, improves the accuracy of fire alarm.
The technology contents of the not detailed description of the present invention is known technology.

Claims (6)

1. low-voltage distribution cabinet fire alarm system, comprise temperature sensor, current transformer, first residual current action breaker and the first residual current type detector for electric fire protection, described current transformer is set in the end of incoming cables of the first residual current action breaker, it is characterized in that, described temperature sensor first output terminal is connected with the temperature signal input of the first residual current type detector for electric fire protection, its second output terminal connects the signal input part of PLC after the first current amplifier, the current signal output end of described first residual current type detector for electric fire protection connects the signal input part of PLC after the second current amplifier, the signal output part of described PLC connects the input end of the first residual current action breaker.
2. low-voltage distribution cabinet fire alarm system according to claim 1, it is characterized in that, reservoir in described PLC can store the current value of temperature sensor sampling last time, for comparing with the current value of temperature sensor sampling next time, 1 is defined as when the current value of temperature sensor sampling next time is greater than the current value of sampling last time, otherwise be 0, simultaneously, storer in PLC stores current value last time that the first residual current type detector for electric fire protection inputs, for comparing with the current value next time of the first residual current type detector for electric fire protection input, 0 is defined as when current value last time of the first residual current type detector for electric fire protection input is less than the current value of sampling next time, otherwise be 1, the numerical value that temperature sensor residual current type detector for electric fire protection obtains respectively compares by described PLC again, when being 1, output alarm control signal, its remainder values is normal.
3. low-voltage distribution cabinet fire alarm system according to claim 1, it is characterized in that, described first residual current action breaker end of incoming cables is arranged in parallel the second residual current action breaker, and the leading-out terminal of the second residual current action breaker is serially connected with the second residual current type detector for electric fire protection.
4. low-voltage distribution cabinet fire alarm system according to claim 1, is characterized in that, described temperature sensor is thermistor temperature sensor.
5. low-voltage distribution cabinet fire alarm system according to claim 1, is characterized in that, the signal output part of described PLC connects audible-visual annunciator.
6. low-voltage distribution cabinet fire alarm system according to claim 1, is characterized in that, described temperature sensor is provided with 2-4.
CN201610121171.9A 2016-03-03 2016-03-03 Low-voltage distribution cabinet fire alarm system Pending CN105513253A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610121171.9A CN105513253A (en) 2016-03-03 2016-03-03 Low-voltage distribution cabinet fire alarm system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610121171.9A CN105513253A (en) 2016-03-03 2016-03-03 Low-voltage distribution cabinet fire alarm system

Publications (1)

Publication Number Publication Date
CN105513253A true CN105513253A (en) 2016-04-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106054763A (en) * 2016-05-19 2016-10-26 杭州施厚能源科技有限公司 Intelligent switch cabinet online measurement and control device
CN113419103A (en) * 2021-07-29 2021-09-21 广东电网有限责任公司 Electrical fire early warning system and method for transformer for station

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100188239A1 (en) * 2006-09-13 2010-07-29 Daniel Rockwell Monitoring electrical assets for fault and efficiency correction
CN202502595U (en) * 2012-03-14 2012-10-24 江苏斯菲尔电气股份有限公司 Multi-functional electrical fire monitoring detector
CN202720065U (en) * 2011-12-30 2013-02-06 西安和其光电科技有限公司 Wireless temperature measuring system of switch cabinet
CN202939759U (en) * 2012-11-21 2013-05-15 广州市科思通技术有限公司 Temperature-sensitive optical fiber and electrical fire hazard two-in-one monitoring system
CN203465806U (en) * 2013-09-04 2014-03-05 上海华宿电气股份有限公司 Electrical fire disaster monitor having function of pulse metering
CN204166645U (en) * 2014-11-15 2015-02-18 天津银箭科技有限公司 A kind of electrical fire-detector with leakage current detect function
CN204215514U (en) * 2014-09-28 2015-03-18 泰豪科技(深圳)电力技术有限公司 A kind of fire hazard monitoring power distribution cabinet
CN104460606A (en) * 2014-11-14 2015-03-25 上海理工大学 Remote monitoring system and method for distribution power transformer

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100188239A1 (en) * 2006-09-13 2010-07-29 Daniel Rockwell Monitoring electrical assets for fault and efficiency correction
CN202720065U (en) * 2011-12-30 2013-02-06 西安和其光电科技有限公司 Wireless temperature measuring system of switch cabinet
CN202502595U (en) * 2012-03-14 2012-10-24 江苏斯菲尔电气股份有限公司 Multi-functional electrical fire monitoring detector
CN202939759U (en) * 2012-11-21 2013-05-15 广州市科思通技术有限公司 Temperature-sensitive optical fiber and electrical fire hazard two-in-one monitoring system
CN203465806U (en) * 2013-09-04 2014-03-05 上海华宿电气股份有限公司 Electrical fire disaster monitor having function of pulse metering
CN204215514U (en) * 2014-09-28 2015-03-18 泰豪科技(深圳)电力技术有限公司 A kind of fire hazard monitoring power distribution cabinet
CN104460606A (en) * 2014-11-14 2015-03-25 上海理工大学 Remote monitoring system and method for distribution power transformer
CN204166645U (en) * 2014-11-15 2015-02-18 天津银箭科技有限公司 A kind of electrical fire-detector with leakage current detect function

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106054763A (en) * 2016-05-19 2016-10-26 杭州施厚能源科技有限公司 Intelligent switch cabinet online measurement and control device
CN106054763B (en) * 2016-05-19 2018-12-21 杭州施厚能源科技有限公司 Intelligent switchboard online monitoring method device
CN113419103A (en) * 2021-07-29 2021-09-21 广东电网有限责任公司 Electrical fire early warning system and method for transformer for station

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Application publication date: 20160420

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