CN203326560U - Low-voltage centralized selective earth leakage protection device - Google Patents
Low-voltage centralized selective earth leakage protection device Download PDFInfo
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- CN203326560U CN203326560U CN2013203818342U CN201320381834U CN203326560U CN 203326560 U CN203326560 U CN 203326560U CN 2013203818342 U CN2013203818342 U CN 2013203818342U CN 201320381834 U CN201320381834 U CN 201320381834U CN 203326560 U CN203326560 U CN 203326560U
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Abstract
The utility model discloses a low-voltage centralized selective earth leakage protection device which comprises a signal acquisition device used for acquiring zero-sequence voltage signals and zero-sequence current signals, a CT/PT signal conditioning unit used for conditioning acquired analog signals to analog voltage signals applicable to be processed by an ARM master controller, an ARM master controller used for operating and processing the conditioned analog voltage signals and determining fault lines and a relay output unit used for receiving signals sent from the ARM master controller so as to output trip signals, wherein the signal acquisition device, the CT/PT signal conditioning unit, the ARM master controller and the relay output unit are electrically connected in order; and the ARM master controller is connected with an LCD capable of displaying leakage fault, zero-sequence voltage and zero-sequence current. By the adoption of a distributed method of decentralized collection of leakage information, centralized discrimination, centralized management and independent control, line-selection accuracy reaches 100%, selective trip is realized, accident influence can be minimized, personal safety is protected, and accident loss is reduced.
Description
Technical field
The relevant a kind of earth leakage protective device of the utility model, refer to the centralized selective leakage protection device of a kind of colliery low voltage electric network especially.
Background technology
At present, the ground commercial power such as the coal preparation plant of coal mining enterprise and Underground Substation generally all adopt three-phase three-wire power supply system, and rated voltage commonly used is 660V, and its transformer neutral point is through high resistance ground or earth-free.When electric leakage occurs when, if insulation damages, the shell of the electric equipments such as motor will be charged, if the operator touches electrified body accidentally, the accident of personal electric shock injures and deaths can occur at any time, person electric shock voltage now equals the phase voltage of system, and shock current is up to more than 200mA, much larger than safe current.And current earth leakage protective device is when carrying out trip protection, the phenomenon that often there will be erroneous judgement and tripping to do, the route selection accuracy rate is not high, can not effectively timely disengagement failure power supply, threaten mine and master worker's safety.
The utility model content
In view of this, main purpose of the present utility model is to provide a kind of colliery low voltage electric network centralized selective leakage protection device.
For achieving the above object, the utility model provides a kind of low pressure centralized selective leakage protection device, its include successively be electrically connected to for gathering the signal pickup assembly of residual voltage signal and zero sequence current signal, it by the analog signal conditioner gathered, is the CT/PT signal condition unit that is applicable to the analog voltage signal of ARM master controller processing, analog voltage signal after conditioning is carried out calculation process and judges the ARM master controller of faulty line and receive signal that the ARM master controller the transmits relay output unit with the output trip signal, this ARM master controller is connected with and can shows leak current fault, residual voltage, the liquid crystal display of zero-sequence current.
Described signal pickup assembly includes the zero sequence current mutual inductor that is arranged on each minute branch road and the zero sequential potential transformer of the transformer neutral line, is respectively used to gather the zero-sequence current of each minute branch road and the residual voltage of the transformer neutral line.
Described CT/PT signal condition unit includes filter and nurses one's health the signal conditioner for the analog voltage signal of applicable described ARM master controller processing for residual voltage and zero-sequence current that signal pickup assembly is sent.
Described ARM master controller comprises that A/D converter and the digital signal to after conversion carry out calculation process and judge the arm processor of faulty line.
Described arm processor transfers to described liquid crystal display by the real time data of computing by the RS-485 serial bus.
Described arm processor is to described relay output unit signal transmission and control the dizzy unit of described relay output output trip signal.
The utility model adopts distributed collection electric leakage information, concentrated differentiation, centralized management, the independent collecting and distributing type method of controlling; the accuracy of route selection reaches 100%, has realized the selectivity tripping operation, the impact of accident can be reduced to minimum; the protection personal safety, reduced causality loss.
The accompanying drawing explanation
Fig. 1 is the structured flowchart that the utility model low pressure is concentrated military selective leakage protection device.
Embodiment
For ease of structure of the present utility model and the effect that reaches are had to further understanding, the existing preferred embodiment that develops simultaneously by reference to the accompanying drawings is described in detail as follows.
When adopting zero sequence power direction formula principle to be judged, by the zero sequential potential transformer summation current transformer, slave computer synchronous acquisition transformer neutral point voltage is the zero-sequence current of residual voltage and each outgoing, after filtering, A/D conversion, calculates amplitude and phase place; CPU compares gathered residual voltage, zero-sequence current size with each definite value, and the phase place that compares the two, while being confirmed to be this loop generation leak current fault, accurately failure judgement outlet, start the exit relay tripping operation, simultaneously in computer liquid crystal display screen display: leak current fault, residual voltage, zero-sequence current; When adopting the zero-sequence current colony amplitude comparison than facies principle, the electric current gathered by zero sequence current mutual inductor, compared the relation on amplitude and phase place between each zero-sequence current by real part and the imaginary part of electric current phasor, if the long-pending and imaginary part of real part long-pending and all be less than zero between one of them branch road transformer current and two other electric current, can judge that single-phase earth leakage must occur on this branch road, this branch road switch-dividing carries out the earth leakage protective action; If the long-pending and imaginary part of real part long-pending and all be greater than zero between any two electric currents, can judge that single-phase earth leakage must occur on main line, master switch carries out the earth leakage protective action.
System is during without single phase ground fault, device is in monitored state, liquid crystal display screen shows current date and time, when residual voltage is greater than setting value (120V), expression system generation single-phase earthing, now CPU by the residual voltage data of collection and all zero-sequence current data carry out filtering, sequence, judgement, through after analysis-by-synthesis repeatedly, earth fault information (as ground connection initial time, faulty line number, fault cumulative time etc.) the brilliant screen display of liquor charging is shown, and sent the relay output alarm by judged result.
As shown in Figure 1; the centralized selective leakage protection device of low pressure of the present utility model includes signal pickup assembly 1, CT/PT (the Current Transformer/Potential Transformer connected successively; Current Mutual Inductance/mutual induction of voltage) the signal condition unit 2; ARM master controller 3 and relay output unit 4, this ARM master controller is connected with liquid crystal display 5.
This signal pickup assembly 1 includes the zero sequence current mutual inductor that is arranged on each minute branch road and the zero sequential potential transformer of the transformer neutral line, be respectively used to gather the zero-sequence current of each minute branch road and the residual voltage of the transformer neutral line, this signal pickup assembly 1 is delivered to CT/PT (Current Transformer/Potential Transformer by the analog signal of collection, Current Mutual Inductance/mutual induction of voltage) the signal condition unit 2, this CT/PT signal condition unit 2 is processed the analog signal conditioner gathered analog voltage signal for being applicable to ARM master controller 3, 3 pairs of signals of ARM master control carry out computing and judge is which outgoing breaks down, and show leak current fault on liquid crystal display 5 simultaneously, residual voltage, zero-sequence current, relay output unit 4 is directly exported trip signal according to the operation result of ARM master controller 3 and is carried out earth leakage protective.
In the utility model, the basic task of CT/PT signal condition unit 2 is current signal that zero sequence current mutual inductor and zero sequential potential transformer are sampled and voltage signal conditioning for can be for the analog voltage signal of ARM master controller 3 computings, and carry out the work such as necessary signal condition, amplification, this CT/PT signal condition unit 2 includes filter 20 and signal conditioner 21, can carry out filtering and conditioning to signal.
The core that ARM master controller 3 is whole system, the main analog voltage signal of being responsible for transmitting CT/PT signal condition unit 2 carries out the A/D conversion, digital signal after conversion is carried out calculation process and judged faulty line, with control relay output unit 4, and be responsible for and host computer and display floater carry out communication.This ARM master controller 3 comprises A/D converter 30 and arm processor 31.The signal that these relay output unit 4 reception arm processors 31 transmit is with the adhesive of output trip signal control relay.
Arm processor 31 in the utility model is by RS-485 serial bus connecting fluid crystal display 5, the real time data of arm processor 31 computings is also sent into liquid crystal display 5 by serial bus, this liquid crystal display 5 is equipped with corresponding software, show in real time each minute branch road zero-sequence current and neutral line residual voltage, possess data query and fault inquiry function, can pass through this software, slave computer CPU is carried out to the setting of data simultaneously.
In the utility model, the operation of liquid crystal display 5 is as follows:
(1) switch on power, start self-starting host computer, enter desktop;
(2) there will be the hint image of logining this electric leakage system after entering desktop, after the input password, directly by enter key or with left mouse button, click (be called for short and click later) " determining " knob, can enter host computer leakage protection system software master interface; Enter after desktop as the hint image of this electric leakage system of login do not occur, also available left mouse button is double-clicked " leakage protection system " icon of (later being called for short double-click) desktop, there will be equally the hint image of logining this electric leakage system;
(3) in " real time data display frame ", can show in real time the residual voltage of whole system and the zero-sequence current of each branch road, simultaneously the what part can be pointed out in lower left when; Another lower right comprises ten buttons, and its function is described below:
1. " close branch road ": if want to close a certain branch road, click this knob, in " closing the power supply branch road " picture ejected, after choosing this branch road of certain district, click " closing selected branch road " knob, in " warning " prompting frame ejected immediately, click OK is about to close this branch road; Click Cancel is closed this dataway operation by cancellation, and returns to " closing the power supply branch road " picture, as clicks " discard changes " knob and will abandon this operation, and returns to key frame;
2. " branch road resets ": if want to reset a certain branch road, click this knob, in " branch road resets " picture ejected, after choosing this branch road of certain district, click " selected branch road resets " knob, in " warning " prompting frame ejected immediately, click OK this branch road that is about to reset; Click Cancel is cancellation this dataway operation that resets, and returns to " branch road resets " picture, as clicks " discard changes " knob and will abandon this operation, and returns to key frame;
3. " setting is adjusted and is planted ": click this knob, can be used for adjusting residual voltage in leakage protection system, zero-sequence current, and the action setting value (suggestion adopts system default value) of phase difference; In the picture ejected, click OK will be preserved the modification value; Click Cancel will be abandoned this retouching operation, and return to key frame;
4. " adjust gain ": click this knob, can be used for adjusting the yield value (suggestion adopts system default value) of residual voltage and zero-sequence current in leakage protection system; In the picture ejected, click OK will be preserved the modification value; Click Cancel will be abandoned this retouching operation, and return to key frame;
5. " phase place inquiry ": click this knob, can be used for inquiring about the residual voltage in this moment in leakage protection system and the phase difference of zero-sequence current; In the picture ejected, click OK will return to key frame;
6. " communication setting ": click this knob, can be used for selecting communication port (suggestion adopts system default value serial ports 1 one by one), the system communication mouth is definite, forbids revising; In the picture ejected, click OK will be preserved this time and select; Click Cancel will be abandoned this retouching operation, and return to key frame;
7. " branch road description ": click this knob, can be used for revising certain branch road title; In the picture ejected, click OK will be preserved the modification value; Click Cancel will be abandoned this retouching operation, and return to key frame;
8. " exit ": click this knob, can exit the host computer leakage protection system;
(4), in " the inquiry of historical data ", can find the historgraphic data recording (comprising time, zero-sequence current, residual voltage) of section sometime; As long as choose the area code that will look into the branch road place in this picture, choose the time period that will look into, click " inquiry " button, just can show time, zero-sequence current, the residual voltage of this this time period of district, conveniently consult;
(5), in " history querying ", can find the historical events record of section sometime; As long as choose the time period that will look in this picture, click " inquiry " button, just can show the historical events that this time period occurs, conveniently consult; If click " protection event " check button, then click " inquiry " button, just can find very easily the historical protective event that this time period occurs;
(6) once single-phase earthing or person electric shock occur, on the event log of the upper owner of leakage protection system interface, can so-and-so branch road earth leakage protective of prompting move, and system is returned disengagement failure branch road at once, simultaneously display floater also can be stayed picture stop the protected picture of so-and-so branch road, and " fault " reaches " protection " lantern festival and light; Once fault is clicked the branch road that " branch road resets " resets and fixed a breakdown after getting rid of, master system normally moves, and now, presses display floater and " determines " knob, and " fault " reaches " protection " lantern festival and extinguish, and display floater normally moves.
Technical parameter of the present utility model:
1, environmental requirement
(1) ambient temperature :-20 ℃～+ 55 ℃;
(2) relative humidity: be less than 90%, surface is without condensation;
(3) atmospheric pressure: 80～110Kpa;
(4) height above sea level:<2000m;
(5) surrounding medium without electro-conductive dust with cause metal or make the corrosive gas, mould etc. of insulation damages;
2, technical parameter
(1) can monitor 14 branch roads of branch line simultaneously;
(2) earthing mode: be applicable to isolated neutral or resistance grounded system;
(3) move when the leakage current relay current is more than or equal to 150mA, send sound and light alarm; While being more than or equal to 300mA, the tripping operation of transformer low voltage incoming line cabinet;
(5) zero-sequence current input range: 0～1000mA (while being greater than, must state during order);
(6) residual voltage input range: 0～150V;
(7) warning output contact capacity: AC250V 5A; DC12V 1A;
(8) rated operational voltage: AC/DC220V 20%;
(9) nominal operation frequency: 50Hz;
(10) Overall Power Consumption:<25W;
(11) communication interface: RS232/485, baud rate 9600bps.
3, substation:
Detect current range: 0-1A;
Current detecting error:<1%;
Resolution: 2.5mA adjusts;
Operate time:<50ms;
The delay adjustments time: arbitrarily.
4, main website
Detect current range: 0-1A;
Current detecting error:<1%;
Resolution: 5nA adjusts;
Operate time :≤150ms;
The delay adjustments time: arbitrarily.
5, selective earth leakage protection system
Bus mode: fieldbus;
Interface mode: RS-485;
Transmission rate: 9600bps;
Communication protocol: make by oneself.
6, centrally connected power supply DC power supply:
Input voltage: AC220V;
Output voltage: DC5V, ± 12V, 24V;
Output current: 4A.
Function of the present utility model and characteristics:
(1) brand-new hardware system, design adopts dual-cpu structure, and it is more reasonable that program function distributes, and moves more stable;
(2) native system adopts the high-performance arm processor as control core, can realize the synchronous acquisition of multichannel electric current, voltage, has greatly improved the speed of sampling;
(3) native system adopts zero sequence power direction type and zero-sequence current colony amplitude comparison than phase comprehensive criterion, faulty line to be judged; Improved the failure line selection accuracy;
(4) can match remote moving function, provide relay node telemechanical output signal, the output of relay node output signal;
(5), when fault occurs, can show Trouble Report (type, time, fault parameter), and provide warning;
(6) be easy to and the comprehensive automation interface, the RS-485 communication interface is provided, flexible and convenient to use;
(7) man-machine interface is simple to operation, full menu in Chinese, and rich display information is directly perceived;
(8) preserve the fault message occurred recently, after dead electricity, data are not lost.
The utility model adopts distributed collection electric leakage information, concentrated differentiation, centralized management, the independent collecting and distributing type method of controlling, and the accuracy of route selection reaches 100%, has really realized the selectivity tripping operation, the impact of accident can be reduced to minimum; Simultaneously, due to the rapidity of action, when the accident of human electric shock occurs; can guarantee to reach the safe parameter of 30mAs, can protect the unlikely death of person electric shock, can dwindle power failure range again; reducing causality loss, be convenient to the looking up the fault circuit simultaneously, is advanced, reliable safety guard.This line-selected earthing device, can, when system generation single-phase earthing, accurately, promptly select ground path or bus.Easy to use, Maintenance free, can need to pass to higher level's supervisory control system by communication interface by relevant information according to the user, is applicable to unattended operation transformer station.
The above, be only preferred embodiment of the present utility model, is not intended to limit protection range of the present utility model.
Claims (6)
1. the centralized selective leakage protection device of low pressure, it is characterized in that, its include successively be electrically connected to for gathering the signal pickup assembly of residual voltage signal and zero sequence current signal, it by the analog signal conditioner gathered, is the CT/PT signal condition unit that is applicable to the analog voltage signal of ARM master controller processing, analog voltage signal after conditioning is carried out calculation process and judges the ARM master controller of faulty line and receive signal that the ARM master controller the transmits relay output unit with the output trip signal, this ARM master controller is connected with and can shows leak current fault, residual voltage, the liquid crystal display of zero-sequence current.
2. the centralized selective leakage protection device of low pressure as claimed in claim 1; it is characterized in that; described signal pickup assembly includes the zero sequence current mutual inductor that is arranged on each minute branch road and the zero sequential potential transformer of the transformer neutral line, is respectively used to gather the zero-sequence current of each minute branch road and the residual voltage of the transformer neutral line.
3. the centralized selective leakage protection device of low pressure as claimed in claim 1; it is characterized in that, described CT/PT signal condition unit includes filter and nurses one's health the signal conditioner for the analog voltage signal of applicable described ARM master controller processing for residual voltage and zero-sequence current that signal pickup assembly is sent.
4. the centralized selective leakage protection device of low pressure as claimed in claim 1, is characterized in that, described ARM master controller comprises that A/D converter and the digital signal to after conversion carry out calculation process and judge the arm processor of faulty line.
5. the centralized selective leakage protection device of low pressure as claimed in claim 4, is characterized in that, described arm processor transfers to described liquid crystal display by the real time data of computing by the RS-485 serial bus.
6. the centralized selective leakage protection device of low pressure as claimed in claim 4, is characterized in that, described arm processor is to described relay output unit signal transmission and control described relay output unit output trip signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203818342U CN203326560U (en) | 2013-07-01 | 2013-07-01 | Low-voltage centralized selective earth leakage protection device |
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| CN2013203818342U CN203326560U (en) | 2013-07-01 | 2013-07-01 | Low-voltage centralized selective earth leakage protection device |
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| CN203326560U true CN203326560U (en) | 2013-12-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744452A (en) * | 2013-12-13 | 2014-04-23 | 山东新华医疗器械股份有限公司 | Tunnel-type sterilization drying oven heating monitor control system and method |
| CN105157888A (en) * | 2015-09-28 | 2015-12-16 | 烟台三环锁业集团有限公司 | Multi-channel sensor real time detection system |
| US11495427B2 (en) | 2020-12-02 | 2022-11-08 | Kedu Electric Co., Ltd. | Leakage protector |
-
2013
- 2013-07-01 CN CN2013203818342U patent/CN203326560U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103744452A (en) * | 2013-12-13 | 2014-04-23 | 山东新华医疗器械股份有限公司 | Tunnel-type sterilization drying oven heating monitor control system and method |
| CN103744452B (en) * | 2013-12-13 | 2015-10-28 | 山东新华医疗器械股份有限公司 | Tunnel-type sterilizing oven heating monitoring control system and method |
| CN105157888A (en) * | 2015-09-28 | 2015-12-16 | 烟台三环锁业集团有限公司 | Multi-channel sensor real time detection system |
| US11495427B2 (en) | 2020-12-02 | 2022-11-08 | Kedu Electric Co., Ltd. | Leakage protector |
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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 |
Granted publication date: 20131204 Termination date: 20140701 |
|
| EXPY | Termination of patent right or utility model |