CN204241550U - A kind of neutral line current apparatus for warning overload - Google Patents

A kind of neutral line current apparatus for warning overload Download PDF

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Publication number
CN204241550U
CN204241550U CN201420703859.4U CN201420703859U CN204241550U CN 204241550 U CN204241550 U CN 204241550U CN 201420703859 U CN201420703859 U CN 201420703859U CN 204241550 U CN204241550 U CN 204241550U
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CN
China
Prior art keywords
module
signal input
resistance
current transformer
adc0832
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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
CN201420703859.4U
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Chinese (zh)
Inventor
本豫辽
鲁改凤
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 HENAN CHANGGE POWER SUPPLY Co Ltd
State Grid Corp of China SGCC
North China University of Water Resources and Electric Power
Original Assignee
STATE GRID HENAN CHANGGE POWER SUPPLY Co Ltd
State Grid Corp of China SGCC
North China University of Water Resources and Electric Power
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 HENAN CHANGGE POWER SUPPLY Co Ltd, State Grid Corp of China SGCC, North China University of Water Resources and Electric Power filed Critical STATE GRID HENAN CHANGGE POWER SUPPLY Co Ltd
Priority to CN201420703859.4U priority Critical patent/CN204241550U/en
Application granted granted Critical
Publication of CN204241550U publication Critical patent/CN204241550U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a kind of neutral line current apparatus for warning overload, comprise current transformer, comparison module, AD conversion module, controller module and alarm module, the primary side of current transformer is connected on the zero line of substation transformer low-pressure side, the secondary side of current transformer connects the signal input part of comparison module, the signal output part of comparison module is connected to the signal input part of AD conversion module, the signal output part of AD conversion module is connected to the sampled signal input end of controller module, the signal input part of alarm module is connected to the alarm signal output ends of controller module, current transformer is also provided with over-voltage protection module.The utility model by arranging apparatus for warning overload on zero line, structure is simple, be easy to realize, and there is real-time, during complete alternative transformer keeper makes an inspection tour, application table measurement amount judges the security that zero line runs, effectively prevents zero line because of accidents such as the electric loop of overload appearance or electrical equipment burn out.

Description

A kind of neutral line current apparatus for warning overload
Technical field
The utility model relates to neutral line current overload measurement field, is specifically related to a kind of neutral line current apparatus for warning overload.
Background technology
The output voltage of 10 kV substation transformer low-pressure sides is 380 volts, and low-pressure side has drawn four lines, be respectively a phase line, b phase line, c phase line and 0 phase line, wherein a phase line, b phase line and these three phase lines of c phase line are the load power source of 380 volts for magnitude of voltage, be commonly referred to as live wire, and 0 phase line is commonly referred to as zero line, zero line is the load power source of 220 volts for magnitude of voltage, therefore this root zero line is exactly a phase line, the common line of b phase line and these three phase lines of c phase line, according to calculating and the distribution of load, zero line respectively with a phase line, b phase line and c phase line carry out matching application.China to the technical standard that zero line uses is, is less than live wire 1 ~ 2 model, in theory, a complete and intact loop, its electric current is the closed loop flowing to zero line from the live wire of power supply through electric appliance load, and zero line under normal circumstances, is do not bear load current.But in the wiring process of reality with in using, live wire, the zero line of electrician's pair of wire connection terminals when wiring are not distinguished, and cause live wire, zero line connects mixed, i.e. zero line in the terminal misconnection of this line of starting to exchange fire; And live wire in the terminal misconnection of this connecting to neutral line, there is hybrid junction in live wire and zero line, or zero line long term overloading runs, zero line is made to bear load current in actual moving process, once zero line carry load electric current, and the load current value carried is comparatively large and after exceeding the ability of damming of zero line, it is overheated gently then to occur, insulation breakdown; Heavy then there will be and blow or cause short trouble, formed on fire and burn the accident of electrical equipment.
Utility model content
The utility model provides a kind of neutral line current apparatus for warning overload; efficiently avoid the situation that zero line long term overloading runs; protecting zero line and circuit, avoid generation zero line to occur blowing or causing the phenomenon of short trouble, preventing the accident with burning electrical equipment on fire from occurring.
The utility model is by the following technical solutions:
A kind of neutral line current apparatus for warning overload, comprise current transformer, comparison module, AD conversion module, controller module and alarm module, the primary side of current transformer is connected on the zero line of substation transformer low-pressure side, the secondary side of current transformer connects the signal input part of comparison module, the signal output part of comparison module is connected to the signal input part of AD conversion module, the signal output part of AD conversion module is connected to the sampled signal input end of controller module, the signal input part of alarm module is connected to the alarm signal output ends of controller module, current transformer is also provided with over-voltage protection module.
Described comparison module adopts differential type circuit, and reference voltage chip is connected to the anode of operational amplifier by the second resistance, and the second resistance is by the 3rd resistance eutral grounding; The secondary side of current transformer is connected to the negative terminal of operational amplifier by the first resistance, the first resistance is connected to the output terminal of operational amplifier by the 4th resistance, and the output terminal of operational amplifier is connected to the signal input part of modular converter.
Described controller module adopts STC89C52, the P2.4/A12 end of STC89C52 is connected to the base stage of triode by the 5th resistance, the collector of triode is connected to the anode of light emitting diode by the 6th resistance, the negative electrode of light emitting diode connects voltage source, and the transmitting collection of triode is by hummer ground connection.
Described AD conversion module adopts the sheet of ADC0832, ADC0832 to select Enable Pin be connected to the P3.1/TXD end of STC89C52, the data signal output DI of ADC0832 is connected the P3.3/ of STC89C52 with data signal input DO end, the clock signal terminal CLK of ADC0832 is connected to the P3.2/ of STC89C52 end, ADC0832 sheet choosing with reference to 0 potential end GND ground connection, the power input Vcc of ADC0832 is connected to+5V voltage source.
Described voltage protection module adopts overvoltage protection device.
The utility model by arranging apparatus for warning overload on zero line, structure is simple, be easy to realize, and there is real-time, during complete alternative transformer keeper makes an inspection tour, application table measurement amount judges the security that zero line runs, effectively prevents zero line because of accidents such as the electric loop of overload appearance or electrical equipment burn out.
Accompanying drawing explanation
Fig. 1 is the utility model structured flowchart;
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
As shown in Figure 1, the utility model comprises current transformer, comparison module, AD conversion module, controller module and alarm module.The primary side of current transformer is connected on the zero line of substation transformer low-pressure side, the secondary side of current transformer connects the signal input part of comparison module, the signal output part of comparison module is connected to the signal input part of AD conversion module, the signal output part of AD conversion module is connected to the sampled signal input end of controller module, and the signal input part of alarm module is connected to the alarm signal output ends of controller module.Current transformer is also provided with over-voltage protection module, and voltage protection module adopts overvoltage protection device, protective current mutual inductor.
As shown in Figure 2, in the utility model, comparison module adopts differential type circuit, and reference voltage chip is by the second resistance R 2be connected to operational amplifier U 1anode, the second resistance R 2by the 3rd resistance R 3ground connection; The secondary side of current transformer is by the first resistance R 1be connected to operational amplifier U 1negative terminal, the first resistance R 1by the 4th resistance R 4be connected to the output terminal V of operational amplifier out, the output terminal V of operational amplifier outbe connected to the signal input part of AD conversion module.R is chosen in circuit 1=R 2=R 3=R 4, the output voltage values of reference voltage chip is steady state value, and the output valve of reference voltage chip equals the maximal value that zero-line section allows.Principle of work from operational amplifier: , wherein V 1for the magnitude of voltage of reference voltage, be definite value, V 2for the magnitude of voltage of Current Transformer Secondary side, V 2with flow through the current related of zero line.Known by analysis: as the magnitude of voltage V of Current Transformer Secondary side 2be greater than the magnitude of voltage V of reference voltage 1time, the output voltage V of operational amplifier outfor negative value, as the magnitude of voltage V of Current Transformer Secondary side 2be less than the magnitude of voltage V of reference voltage 1time, the output voltage V of operational amplifier outfor on the occasion of.
Controller module adopts single-chip microcomputer STC89C52, the P2.4/A12 end of single-chip microcomputer STC89C52 is connected to the base stage of triode T1 by the 5th resistance R5, the collector of triode T1 is connected to the anode of light emitting diode D1 by the 6th resistance R6, the negative electrode of light emitting diode D1 connects voltage source, the transmitting collection of triode T1 is by hummer ground connection, when the P2.4/A12 port of controller module produces high level, triode T1 conducting, device starts to report to the police, when the P2.4/A12 port of controller module produces low level, triode T1 ends, and device is not reported to the police.
AD conversion module adopts the sheet of ADC0832, ADC0832 to select Enable Pin be connected to the P3.1/TXD end of STC89C52, the data signal output DI of ADC0832 is connected the P3.3/ of STC89C52 with data signal input DO end, the clock signal terminal CLK of ADC0832 is connected to the P3.2/ of STC89C52 end, ADC0832 sheet choosing with reference to 0 potential end GND ground connection, the power input Vcc of ADC0832 is connected to+5V voltage source.The effect of AD conversion module is that analog electrical signal is converted to electric signal, identifies for single-chip microcomputer STC89C52.
Voltage protection module adopts overvoltage protection device.
When using the utility model, first the maximum current that zero line can bear is calculated, using this electric current as the reference value of reference voltage, choose suitable reference voltage chip, according to the principle of work of operational amplifier, when neutral line current exceedes set maximal value, the output voltage V of operational amplifier outfor negative value, be simulating signal, this simulating signal is converted to digital signal by ADC0832, then exports high level by single-chip microcomputer STC89C52, trigger alarm module, realizes the function of reporting to the police; When neutral line current does not exceed set maximal value, the output voltage V of operational amplifier outfor on the occasion of, now by single-chip microcomputer STC89C52 output low level, alarm module is not reported to the police.
The utility model by arranging apparatus for warning overload on zero line, structure is simple, be easy to realize, and there is real-time, during complete alternative transformer keeper makes an inspection tour, application table measurement amount judges the security that zero line runs, and effectively can prevent the accidents such as the electric loop because zero line overload occurs or electrical equipment burn out.
Above embodiment of the present utility model is described.It is to be appreciated that the utility model is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the appended claims.

Claims (5)

1. a neutral line current apparatus for warning overload, it is characterized in that: comprise current transformer, comparison module, AD conversion module, controller module and alarm module, the primary side of current transformer is connected on the zero line of substation transformer low-pressure side, the secondary side of current transformer connects the signal input part of comparison module, the signal output part of comparison module is connected to the signal input part of AD conversion module, the signal output part of AD conversion module is connected to the sampled signal input end of controller module, the signal input part of alarm module is connected to the alarm signal output ends of controller module, current transformer is also provided with over-voltage protection module.
2. a kind of neutral line current apparatus for warning overload as claimed in claim 1, is characterized in that: described comparison module adopts differential type circuit, and reference voltage chip is connected to the anode of operational amplifier by the second resistance, and the second resistance is by the 3rd resistance eutral grounding; The secondary side of current transformer is connected to the negative terminal of operational amplifier by the first resistance, the first resistance is connected to the output terminal of operational amplifier by the 4th resistance, and the output terminal of operational amplifier is connected to the signal input part of modular converter.
3. a kind of neutral line current apparatus for warning overload as claimed in claim 1, it is characterized in that: described controller module adopts STC89C52, the P2.4/A12 end of STC89C52 is connected to the base stage of triode by the 5th resistance, the collector of triode is connected to the anode of light emitting diode by the 6th resistance, the negative electrode of light emitting diode connects voltage source, and the transmitting collection of triode is by hummer ground connection.
4. a kind of neutral line current apparatus for warning overload as claimed in claim 2, is characterized in that: described AD conversion module adopts the sheet of ADC0832, ADC0832 to select Enable Pin be connected to the P3.1/TXD end of STC89C52, the data signal output DI of ADC0832 is connected the P3.3/ of STC89C52 with data signal input DO end, the clock signal terminal CLK of ADC0832 is connected to the P3.2/ of STC89C52 end, ADC0832 sheet choosing with reference to 0 potential end GND ground connection, the power input Vcc of ADC0832 is connected to+5V voltage source.
5. a kind of neutral line current apparatus for warning overload as claimed in claim 1, is characterized in that: described voltage protection module adopts overvoltage protection device.
CN201420703859.4U 2014-11-21 2014-11-21 A kind of neutral line current apparatus for warning overload Expired - Fee Related CN204241550U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420703859.4U CN204241550U (en) 2014-11-21 2014-11-21 A kind of neutral line current apparatus for warning overload

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420703859.4U CN204241550U (en) 2014-11-21 2014-11-21 A kind of neutral line current apparatus for warning overload

Publications (1)

Publication Number Publication Date
CN204241550U true CN204241550U (en) 2015-04-01

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Application Number Title Priority Date Filing Date
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105137207A (en) * 2015-09-25 2015-12-09 国网山东省电力公司济南供电公司 Three-phase power supply load unbalancing alarming device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105137207A (en) * 2015-09-25 2015-12-09 国网山东省电力公司济南供电公司 Three-phase power supply load unbalancing alarming device

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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: 20150401

Termination date: 20151121

EXPY Termination of patent right or utility model