CN201616666U - Multifunctional short circuit protecting system of middle and low-voltage switch cabinet - Google Patents

Multifunctional short circuit protecting system of middle and low-voltage switch cabinet Download PDF

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Publication number
CN201616666U
CN201616666U CN2010291600036U CN201029160003U CN201616666U CN 201616666 U CN201616666 U CN 201616666U CN 2010291600036 U CN2010291600036 U CN 2010291600036U CN 201029160003 U CN201029160003 U CN 201029160003U CN 201616666 U CN201616666 U CN 201616666U
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CN
China
Prior art keywords
output
wireless
door
short circuit
input
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
Application number
CN2010291600036U
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Chinese (zh)
Inventor
渠永超
高丽琴
禹江
刘辉
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.)
BAODING TIANWEI HENGTONG ELECTRIC Co Ltd
Original Assignee
BAODING TIANWEI HENGTONG ELECTRIC Co Ltd
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Priority to CN2010291600036U priority Critical patent/CN201616666U/en
Application granted granted Critical
Publication of CN201616666U publication Critical patent/CN201616666U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model provides a multifunctional short circuit protecting system of a middle and low-voltage switch cabinet which is used for carrying out short circuit protection on the switch cabinet. The multifunctional short circuit protecting system consists of a wireless temperature measuring module and an electric arc protecting device with a built-in wireless communication circuit; the wireless temperature measuring module and the arc protecting device carry out the communication by wireless signals; the wireless temperature measuring module consists of a thermistor, a temperature measuring singlechip and a wireless emitter; the thermistor is arranged on a bus in the switch cabinet; the thermistor is connected in series with a first resistor and then is connected with a direct current power supply; the temperature signal output by the serial connecting point is connected with the input terminal of the temperature measuring singlechip; and the input terminal of the wireless emitter is connected with the output terminal of the temperature measuring singlechip. In the utility model, the function is full, the switch cabinet can be protected roundly; furthermore, accurate and reliable system environment temperature information can be provided to running maintainers instantly so that the maintainers can find and eliminate the hidden accident trouble in time and the economic loss can be reduced to maximum degree.

Description

Multi-functional mesolow switch cubicle short circuit protection system
Technical field
The utility model relates to a kind of improved mesolow switch cubicle short circuit protection system, belongs to the resist technology field.
Background technology
The switch cubicle built-in electrical insulation tends to cause short trouble when being destroyed, in-cabinet temperature sharply rises when serious, produces electric arc then, and switch cubicle is seriously damaged.The basic reason that insulation is destroyed in the switch cubicle is that the equipment work ambient temperature is too high, and insulation is at high temperature aging to be accelerated.At present, the switch cubicle short circuit protection system mainly contains two kinds, and a kind of is relaying protection system, and another kind is the arclight protection system.Relaying protection system is failure criterion with the current increment, needs certain judgement time when gathering over-current signal, and failure removal relatively lags behind, and only is suitable for the outer outlet fault of protection switch cabinet.The arclight protection system be with overcurrent and arclight as failure criterion, when switch cubicle is inner when the arclight fault takes place, the switch cubicle internal unit is protected by cutting off the electricity supply, its protection range is confined in the cabinet.
In addition, existing short circuit protection system is all just taked safeguard measure to equipment after short trouble takes place, do not take any monitoring and precautionary measures, so the economic loss that can not effectively avoid short trouble and brought.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of multi-functional mesolow switch cubicle short circuit protection system is provided.
Problem described in the utility model realizes with following technical proposals:
A kind of multi-functional mesolow switch cubicle short circuit protection system; arclight protective device by wireless temperature measure module and built-in wireless communication line is formed; carry out communication by wireless signal between them; described wireless temperature measure module is made up of thermistor, thermometric single-chip microcomputer and wireless launcher; described thermistor is installed on the interior bus of switch cubicle; after being connected in series, the thermistor and first resistance connects DC power supply; the temperature signal of their serial connections point output connects the input of thermometric single-chip microcomputer, the output of the input termination thermometric single-chip microcomputer of described wireless launcher.
Above-mentioned multi-functional mesolow switch cubicle short circuit protection system, described arclight protective device comprises wireless receiver, light belt, current signal Acquisition Circuit, control single chip computer, overtemperature alarm lamp and relay; The P0.2 end of the output termination control single chip computer of described wireless receiver; Described light belt is provided with two, is installed in bus compartment front and back panel inboard respectively, and the output of light belt connects signaling conversion circuit, latter's output deliver to first with door; Described current signal Acquisition Circuit comprises three current transformers, connect three phase lines of bus-bar room respectively, its output signal end be connected to first or door, first or gate output terminal with first with gate output terminal all be connected to second with door, second with the output P0.0 that is connected to control single chip computer hold; Described overtemperature alarm lamp connects the P1.1 end of control single chip computer; The power circuit breaker of described relay control switch cabinet bus, its control coil connect the P1.0 end of control single chip computer.
Above-mentioned multi-functional mesolow switch cubicle short circuit protection system also comprises delay circuit in the formation, the output of the input termination first of described delay circuit or door, the P1.3 end of output termination control single chip computer.
Above-mentioned multi-functional mesolow switch cubicle short circuit protection system; the signaling conversion circuit that the light signal of light belt output is converted to the signal of telecommunication comprises pull-up resistor, phototriode and inverter; the input end of described phototriode connects the output of light belt; the input of output termination inverter; the output of the input termination phototriode of described inverter, the input of output termination first and door.
Above-mentioned multi-functional mesolow switch cubicle short circuit protection system; output at each current transformer is provided with signal conditioning circuit; described signal conditioning circuit comprises rectifier bridge and A/D converter; the output of the input termination current transformer of described rectifier bridge; output connects the input of A/D converter through voltage stabilizing circuit, the input of the output termination first of described A/D converter or door.
The utility model combines wireless temperature measurement technology, traditional electrical arc light comprehensive protecting technology and Protection Technology, and switch cubicle is comprehensively protected.Wireless temperature measure module is used to monitor bus temperature; and Monitoring Data is sent to the control single chip computer of arclight protective device; control single chip computer judges in view of the above whether switch cubicle operates in the overtemperature state; when temperature surpasses set point; send alarm signal by the overtemperature alarm lamp; the prompting staff in time takes corresponding measure, prevents the generation of short circuit accident.
The arclight protective device is used for the arclight fault of bus-bar room is monitored and protected, and two light belts that are installed in bus compartment front and back panel inboard respectively are used to gather the interior arc optical signal of compartment.Because compartment seals, also can only be one-sided light even external light source shines in the compartment by the slit, two light belts have one to monitor external optical signals at most, and at this moment protective device can malfunction; And when compartment interior was short-circuited fault generation arc light, two light belts will monitor light signal simultaneously, thereby guarantee this device action message.Because the light signal that any point receives on the light belt surface can reach the termination, has improved investigative range of this device and the precision that luminous sensitivity is adjusted greatly, avoids the protective device tripping.
Delay circuit is set can make this device have overcurrent delay protection function; if short trouble appears in the electrical appliance side of feeder line cabinet; also do not occur under the situation of arc light in the switch cubicle side, switch cubicle is protected, prevented that fault from spreading by sending the delay tripping signal.
The utility model is multiple functional; not only can comprehensively protect switch cubicle; but also can the very first time to the operation maintenance personnel provide accurately, reliable system environments temperature information, make the attendant in time find and to get rid of accident potential, reduce economic loss to greatest extent.
Description of drawings,
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the electrical schematic diagram of wireless temperature measure module;
Fig. 2 is the electrical schematic diagram of arclight protective device.
Each label is among the figure: G1, G2, light belt; P1, P2, inverter; CT1, CT2, CT3, current transformer; Q1, Q2, triode; U1, first and the door; U2, second and the door; U3, control single chip computer; U4, first or the door; U5, second or the door; U6, U7, U8, A/D converter; U9, delay circuit; U10, wireless receiver; U11, thermometric single-chip microcomputer; U12, wireless launcher; ZQ1, ZQ2, ZQ3, rectifier bridge; J, relay; LED1, overtemperature alarm lamp; LED2, trouble lamp; D1, D2, D3, voltage stabilizing didoe; R1~R6, resistance; Rt, thermistor.
Embodiment
Referring to Fig. 1, Fig. 2, the utility model combines the function of temperature monitoring, arclight protection and relaying protection, and switch cubicle is comprehensively protected.Because High-Voltage Insulation problem; be difficult to utilize thermometry commonly used that the operating temperature of high-tension apparatus is monitored; the wireless temperature measure module of native system adopts radio wave to carry out the signal transmission; wireless temperature measure module is installed in the switch cubicle bus-bar room and (opens and the measure-alike hole of thermistor Rt on the bus insulation on the bus; temperature sensor is close to the bus copper bar), and do not have electrical link between the receiving equipment (arclight protective device).Wireless receiver receives the terminals P 0.2 that is uploaded to control single chip computer U3 behind the signal by data wire, and control single chip computer U3 sends alarm signal by overtemperature alarm lamp LED1.
This device has independently overcurrent delay protection function; when short trouble appears in the electrical appliance side of each feeder line cabinet; first or door U4 output overcurrent signal; delay circuit U9 sends to this signal lag the terminals P 0.2 of control single chip computer U3; also do not occur under the situation of arc light in the switch cubicle side; make control single chip computer U3 time-delay send trip signal, reference time delay 0-600 second.
The input of the output termination phototriode of light belt G1 (G2), pull-up resistor and phototriode convert the light signal that light belt G1 (G2) is exported to the signal of telecommunication, this signal is sent into the input of inverter P1 (P2), the output output of inverter P1 (P2) and the synchronous signal of telecommunication of light signal of light belt G1 (G2) output.U1 be first with the door, its output end signal is the real arcs light signal.Three current transformer CT1, CT2, CT3 gather bus three-phase overcurrent signal, and ZQ1, ZQ2, ZQ3 are three rectifier bridges, are used for converting the AC signal that three current transformer CT1, CT2, CT3 gather to direct current signal.Voltage stabilizing didoe D1, D2, D3 and resistance R 4, R5, R6 constitute three voltage stabilizing circuits; U6, U7, U8 are three one A/D converters, are used to adjust first or the input level of door U4.
First with the real arcs light signal of door U1 output with first or the overcurrent signal of door U4 output second with door U2 in send into control single chip computer after carrying out AND operation P0.0 hold.
When arc fault occurring, control single chip computer U3 makes the bus outage by P1.0 end output trip signal, prevents that fault from further enlarging.Simultaneous faults alarm lamp LED2 lights, and sends alarm signal.As seen from Figure 2, when trouble lamp LED lights, arc fault being arranged not necessarily, might be that abnormal current causes, and at this moment even without tripping operation, also answers the inspection switch cabinet.

Claims (5)

1. multi-functional mesolow switch cubicle short circuit protection system; it is characterized in that; it is made up of the arclight protective device of wireless temperature measure module and built-in wireless communication line; carry out communication by wireless signal between them; described wireless temperature measure module is by thermistor (Rt); thermometric single-chip microcomputer (U11) and wireless launcher (U12) are formed; described thermistor (Rt) is installed on the interior bus of switch cubicle; thermistor (Rt) connects DC power supply after being connected in series with first resistance (R1); the temperature signal of their serial connections point output connects the input of thermometric single-chip microcomputer (U11), the output of the input termination thermometric single-chip microcomputer (U11) of described wireless launcher (U12).
2. according to the described multi-functional mesolow switch cubicle short circuit protection system of claim 1, it is characterized in that described arclight protective device comprises wireless receiver (U10), light belt, current signal Acquisition Circuit, control single chip computer (U3), overtemperature alarm lamp (LED1) and relay (J); The P0.2 end of the output termination control single chip computer (U3) of described wireless receiver (U10); Described light belt is provided with two, is installed in bus compartment front and back panel inboard respectively, and the output of light belt connects signaling conversion circuit, latter's output deliver to first with door (U1); Described current signal Acquisition Circuit comprises three current transformers, connect three phase lines of bus-bar room respectively, its output signal end be connected to first or the door (U4), first or door (U4) output with first with door (U1) output all be connected to second with door (U2), second P0.0 that is connected to control single chip computer (U3) with the output of (U2) holds; Described overtemperature alarm lamp (LED1) connects the P1.1 end of control single chip computer (U3); The power contactor of described relay (J) control switch cabinet bus, its control coil connect the P1.0 end of single-chip microcomputer (U3).
3. according to the described multi-functional mesolow switch cubicle short circuit protection system of claim 2; it is characterized in that; also comprise delay circuit (U9) in the formation, the output of the input termination first of described delay circuit (U9) or door (U4), the P1.3 end of output termination control single chip computer (U3).
4. according to the described multi-functional mesolow switch cubicle short circuit protection system of claim 3; it is characterized in that; signaling conversion circuit comprises pull-up resistor, phototriode, inverter; the output of the input termination light belt of described phototriode; the input of phototriode output termination inverter; the output of the input termination phototriode of described inverter, inverter output connect first with the door (U1) input.
5. according to the described multi-functional mesolow switch cubicle short circuit protection system of claim 4; it is characterized in that; output at each current transformer is provided with signal conditioning circuit; described signal conditioning circuit comprises rectifier bridge and A/D converter; the output of the input termination current transformer of described rectifier bridge; output connects the input of A/D converter through voltage stabilizing circuit, the input of the output termination first of described A/D converter or door (U4).
CN2010291600036U 2010-02-08 2010-02-08 Multifunctional short circuit protecting system of middle and low-voltage switch cabinet Expired - Fee Related CN201616666U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2010291600036U CN201616666U (en) 2010-02-08 2010-02-08 Multifunctional short circuit protecting system of middle and low-voltage switch cabinet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2010291600036U CN201616666U (en) 2010-02-08 2010-02-08 Multifunctional short circuit protecting system of middle and low-voltage switch cabinet

Publications (1)

Publication Number Publication Date
CN201616666U true CN201616666U (en) 2010-10-27

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Application Number Title Priority Date Filing Date
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103022971A (en) * 2012-12-25 2013-04-03 成都星宇节能技术股份有限公司 Integrated measurement and control system for temperature and arc light
CN104993461A (en) * 2015-06-23 2015-10-21 江苏金智科技股份有限公司 Relay protection device providing electric arc light protection function

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103022971A (en) * 2012-12-25 2013-04-03 成都星宇节能技术股份有限公司 Integrated measurement and control system for temperature and arc light
CN104993461A (en) * 2015-06-23 2015-10-21 江苏金智科技股份有限公司 Relay protection device providing electric arc light protection function
CN104993461B (en) * 2015-06-23 2017-11-28 江苏金智科技股份有限公司 A kind of protective relaying device that electric arc protection function is provided

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20101027

Termination date: 20150208

EXPY Termination of patent right or utility model