CN103364680B - A kind of DC earthing warning howler based on opening current dectector - Google Patents
A kind of DC earthing warning howler based on opening current dectector Download PDFInfo
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- CN103364680B CN103364680B CN201310166498.4A CN201310166498A CN103364680B CN 103364680 B CN103364680 B CN 103364680B CN 201310166498 A CN201310166498 A CN 201310166498A CN 103364680 B CN103364680 B CN 103364680B
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Abstract
The present invention discloses a kind of DC earthing warning howler based on opening current dectector, and it comprises: opening current dectector, sound light alarming circuit and signal detection processing module, and described opening current dectector is arranged on the load-side of each branch road in tested direct-current secondary loop; The coil that opening current dectector comprises ring-type iron core and is wrapped on ring-type iron core, described ring-type iron core can be dismantled to combine by two and half ring-type iron cores and form, the first gap and the 2nd gap is formed between the end face of two and half ring-type iron cores, the width in the first gap is greater than the width in the 2nd gap, is provided with magneto-resistive transducing device in the first gap. The present invention has can directly carry out branch road Earth Fault Detection, accuracy of detection, reliability and security height, it is not necessary to power-off installation and equipment volume less be convenient to install useful effect.
Description
Technical field
The present invention relates to a kind of DC earthing warning howler, specifically a kind of DC earthing warning howler carrying out ground fault on-line monitoring for network of being powered by multiple-limb based on opening current dectector, belongs to technical field of electric power.
Background technology
The direct current system of power station, substation is that a complicated multiple-limb is powered network, and it is mainly the second sets such as automatic gear, relaying screen, emergency lighting and communication power supply and provides power supply. The reliability of direct current system directly affects the safety of whole power system, and the fault of direct current system is based on ground fault. Direct current system many employings 110V of generation current factory and substation or 220V Power supply; positive and negative bus is to ground floating; therefore when direct current system generation one-point grounding fault; owing to not formed ground circuit; direct current system still can keep normal operation, and ground fault is not easily discovered, but; if with other one or more ground connection, malfunction or the tripping of protection and control loop will be caused.
In order to investigate out concrete earth fault, usually the technique means adopted in prior art is: first adopt D.C. isolation monitoring device direct current system to be monitored, if after monitoring finds ground fault, the leakage current of cooperation pincer again searches instrument or each duplexure is searched by ground indicator, to determine which bar duplexure touch down point occurs in, and the D.C. isolation monitoring device of this kind of collecting and distributing type adopts bridge-balance principle to monitor usually. Therefore mainly there is following shortcoming in the above Earth Fault Detection means of prior art: (1) is owing to adopting collecting and distributing type monitoring, thus the insulation status of whole system can only be judged, can not directly determine concrete touch down point, it is necessary to carry out open line method and could determine ground connection branch road one by one; (2) when ground fault occurs on charging plant, store battery itself and direct current bus, it is difficult to find touch down point with open line method; (3) for rainy weather, during the situation such as defective insulation of and multipoint earthing or multiple spot virtual earth, it is difficult to find touch down point with open line method at 2;(4) when the positive and negative electrode insulation against ground resistance of direct current system is in impartial decline, the D.C. isolation monitoring device used in prior art cannot send guard signal; (5) in the process using pertinent instruments to investigate each branch road ground fault one by one, if using pincerlike leakage current to search instrument to investigate, search instrument due to pincerlike leakage current and adopt difference stream monitoring principle, need manual mode to investigate by road when searching touch down point, and height is hindered ground connection cannot monitor, therefore investigate the cycle longer, and there is potential safety hazard; If using ground indicator to investigate, owing to ground indicator device need to be contained on the duplexure of direct current system to locate touch down point, and this kind of device remains silent coil, it is thus desirable to power-off is installed, and power-off cannot be carried out between the equipment operating period, even and if install within the equipment stoppage in transit maintenance phase, owing to equipment in housing is many and wiring complicated, therefore cause the problems such as housing insufficient space to occur.
In addition, in order to the particular location that the ground fault of direct-detection direct current system occurs, prior art also exists and can directly be installed on the DC earthing indicating unit that each branch road in direct-current secondary loop carries out leakage current test and warning. But usually also there is following defect: the change of magnetic field strength in adopt hall sensing device closed circuit that detection branches loop leakage current causes in (1) prior art more, due to some natural characteristicss of Huo Er element, it is difficult to meet such as application requirements such as small area analysis detections, and when hall sensing device signal is amplified merely by check processing circuit, owing to signal signal to noise ratio is lower, small area analysis signal after amplification can be submerged in ground unrest, causes being difficult to detect out target signal; (2) the leakage current test module occurred in prior art adopts closed iron core (or back-shaped coil) to realize polymerization magnetic line of force usually, owing to closed iron core and back-shaped coiled notebook close structure as one, therefore also must power-off install to allow duplexure pass closed closed iron core (or back-shaped coil) when using this leakage current test module to carry out duplexure leakage current test, and power-off cannot be carried out between the equipment operating period, which limits the application of the leakage current test module of this kind of structure.
Summary of the invention
For prior art above shortcomings, it is an object of the invention to: how to provide one can directly carry out branch road Earth Fault Detection, accuracy of detection, reliability and security height, it is not necessary to power-off installation and equipment volume less be convenient to install the DC earthing warning howler based on opening current dectector.
In order to realize above-mentioned purpose, present invention employs following technical scheme.
Based on a DC earthing warning howler for opening current dectector, it comprises:
Opening current dectector, for detecting the change of magnetic field strength caused by the leakage current of each branch road in direct-current secondary loop, and exports the electrical signal corresponding with described change of magnetic field strength;
Sound light alarming circuit, for sending report to the police light used and sound;
Signal detection processing module, for being detected by the electrical signal that opening current dectector exports, and judges whether each branch road in described direct-current secondary loop exists ground fault, then starts sound light alarming circuit as there is ground fault;
It is characterized in that:
Described opening current dectector is arranged on the load-side of each branch road in tested direct-current secondary loop; The coil that opening current dectector comprises ring-type iron core and is wrapped on ring-type iron core, described ring-type iron core can be dismantled to combine by two and half ring-type iron cores and form, the first gap and the 2nd gap is formed between the end face of two and half ring-type iron cores, the width in the first gap is greater than the width in the 2nd gap, being provided with magneto-resistive transducing device in the first gap, the setting direction of magneto-resistive transducing device is perpendicular to the cross section in the first gap;
Described signal detection processing module comprises micro-chip, and the output signal of described magneto-resistive transducing device is sent to the input port of micro-chip successively by amplification circuit and analog to digital converter; The output port of micro-chip loads initialize electric current by digital to analog converter and power magnification circuit to coil successively.
This DC earthing warning howler also comprises display circuit, input through keyboard circuit and for carrying out the communicating circuit of data communication with detection main frame, and described display circuit, input through keyboard circuit and communicating circuit are all connected with micro-chip.
Wherein, described first wavelength width of a slit L1 is 3mm, and described 2nd wavelength width of a slit L2 span is: 0mm < L2��0.2mm. Described precision of A/D converter is 12, and digital to analog converter precision is 16.
Compared to existing technology, the present invention has following useful effect:
(1) DC earthing warning howler of the present invention is directly installed on the load-side of each branch road in direct-current secondary loop, with direct-current secondary loop without being directly connected, therefore compared to existing technology in open line method must be used could to determine the detection mode of ground connection branch road one by one, have and can directly determine concrete earth fault, and detecting reliability and the higher useful effect of security.
(2) the present invention uses opening current dectector to carry out leakage current detection, change of magnetic field strength in closed iron core (or the back-shaped coil) closed circuit that the opening current dectector employing magneto-resistive transducing device detection branches loop leakage current of the present invention causes, therefore compared with prior art adopts hall sensing device, overcome hall sensing device to detect minimum electric current and detect the defect that the signal to noise ratio of output signal is little, there is the useful effect that accuracy of detection is high; The ring-type iron core of opening current dectector of the present invention can be dismantled to combine by two and half ring-type iron cores and form, two and half ring-type iron cores can be taken apart when mounted, again two and half ring-type iron cores are closed up after being inserted in duplexure and just complete installation, therefore compared to existing technology in adopt the structure of iron core-closed (or back-shaped coil), have that not needing has a power failure and carry out the useful effect installed.
(3) DC earthing warning howler of the present invention is split type equipment, and DC earthing warning howler can be dismantled with detection main frame, therefore has equipment volume little, is convenient in the housing of limited space to carry out the useful effect installed.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of the present invention;
Fig. 2 is the opening current dectector structural representation in the present invention;
Fig. 3 is DC earthing warning howler configuration schematic diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of DC earthing warning howler based on opening current dectector, it comprises:
Opening current dectector 1, for detecting the change of magnetic field strength caused by the leakage current of each branch road in direct-current secondary loop, and exports the electrical signal corresponding with described change of magnetic field strength;
Sound light alarming circuit 2, for sending report to the police light used and sound;
Signal detection processing module 3, for being detected by the electrical signal that opening current dectector 1 exports, and judges whether each branch road in described direct-current secondary loop exists ground fault, then starts sound light alarming circuit 2 as there is ground fault; Wherein sound light alarming circuit 2 and signal detection processing module 3 constitute the detection main frame of the present invention.
Opening current dectector 1 is arranged on the load-side of each branch road in tested direct-current secondary loop. As shown in Figure 2, opening current dectector 1 comprises ring-type iron core 4 and the coil 5 being wrapped on ring-type iron core 4 to the structure of opening current dectector.Ring-type iron core 4 can be dismantled to combine by two and half ring-type iron cores and form, and specifically, is separately fixed on detection host housing by bolt connecting mode by two and half ring-type iron cores thus realizes the dismantled combination of the two. The first gap 6 and the 2nd gap 7 is formed between the end face of two and half ring-type iron cores, the width in the first gap 6 is greater than the width in the 2nd gap 7, first gap 6 is provided with magneto-resistive transducing device 8, the setting direction of magneto-resistive transducing device 8 is perpendicular to the cross section in the first gap 6, and cross section is cross section in the direction of the width, the first gap 4. Specifically, the length direction of magneto-resistive transducing device 6 is perpendicular to the cross section in the first gap 4, is also namely the length direction of magneto-resistive transducing device 6 and the radial vertical of ring-type iron core 4.
Described signal detection processing module 3 comprises micro-chip, and the output signal of described magneto-resistive transducing device 8 is sent to the input port of micro-chip successively by amplification circuit and analog to digital converter; The output port of micro-chip loads initialize electric current by digital to analog converter and power magnification circuit to coil 5 successively.
Wherein, the width L1 in the first gap is set to hold the minimum width of magneto-resistive transducing device 6, such as, be 3mm; The width L2 span in the 2nd gap can be set to: 0mm < L2��0.2mm. The width L1 in the first gap and the width L2 in the 2nd gap is more little more can reduce the power loss in magnetic field. Precision of A/D converter is 12, and digital to analog converter precision is 16.
Whole DC earthing warning howler is powered by system power supply module. This DC earthing warning howler also comprises display circuit, input through keyboard circuit and for carrying out the communicating circuit of data communication with detection main frame, and display circuit, input through keyboard circuit and communicating circuit are all connected with micro-chip.
Install and configure and working process to the present invention is further elaborated below:
As shown in Figure 3; multiple separate DC earthing warning howlers of the present invention are installed on the load-side of each branch road in tested direct-current secondary loop respectively, specifically adopt standard clamping-rail installation mode that open type leakage current test coil is stuck in the load-side (such as: automatic gear, relaying screen, Outdoor Terminal Case, emergency lighting and communication power supply etc.) of each branch road of secondary circuits.
The present invention, by the leakage current (unbalanced current) in this direct current load loop of on-line checkingi, adopts magnetic equilibrium principle to detect. Concrete testing process is: in signal detection processing module, the output port of micro-chip loads initialize electric current by digital to analog converter and power magnification circuit to coil 5 successively, to keep in the closed circuit of ring-type iron core 4 when not having leakage current as Zero flux, physical circuit connects and is: the termination 10 of coil 5 is connected with the output terminal of power magnification circuit.
The input circuit that in conditioning signal check processing module, analog to digital converter and amplification circuit are formed is stabilized in a suitable scope, ensure that magneto-resistive transducing device 8 is operated in regions of high sensitivity, and guarantee that detection circuit working is in bigger dynamicrange, physical circuit connects the output terminal 9 for magneto-resistive transducing device 8 and is connected with the input terminus amplifying circuit.
Magneto-resistive transducing device 8 detects the change of the magneticstrength that tested duplexure leakage current causes, and by the feeding signal detection processing module 3 of its output terminal after the change of this magneticstrength is converted to electrical signal, finally determine the state (having leakage current or leakage current) of detection by signal detection processing module 3, and then define and occur without DC ground fault.
When normally running, if without DC earthing, the leakage current through DC earthing warning howler is zero or is less than setting alarm threshold value, and DC earthing warning howler of the present invention is not reported to the police.
When there is DC earthing in the load equipment powered by DC earthing warning howler of the present invention or circuit or insulation reduces, leakage current through DC earthing warning howler of the present invention will exceed alarm threshold value, now sound light alarming circuit 2 sends report to the police light used and sound, is specially buzzing and light flash mode is reported to the police. Namely operation personnel can find trouble spot according to the position that DC earthing warning howler is specified very soon, avoid the power failure to other normal branch roads to search.
The concrete working parameter of DC earthing warning howler is as follows:
(1) working temperature :-10 DEG C-50 DEG C;
(2) storing temp :-40 DEG C-85 DEG C;
(3) relative humidity :��95% (40 �� 2 DEG C);
(4) monitoring current type: direct current;
(5) monitoring sensitivity: stake resistance < 50 kilo-ohms (national regulation 25 kilo-ohms);
(6) alarm threshold value scope: 1mA 9mA(can ensure within the scope of this warning howler every function and can not flase alarm);
(7) signal return mode: manually;
(8) warning mode: sound and light alarm;
(9) warning volume :��60 decibels.
The main system function of DC earthing warning howler is as follows:
1, the DC leakage stream of Real-Time Monitoring place DC loop, monitors this loop direct current insulation against ground state and ground fault condition accordingly;
2, there is off-limit alarm function, it is possible to according to the difference of equipment and operational conditions, by dialling code switch-linear hybrid off-limit alarm value;
3, there is many approach alarm function, during warning pilot lamp flicker and with hummer ring, facilitate running maintenance personnel to search touch down point fast;
4, there is signal reset function, when, after electric current off-limit alarm, even if electric current is reduced to again lower than more limit value, warning light and hummer are not closed, need to just close signal after resetting manually.
Specifically, tool of the present invention has the following advantages:
1) compact, structure are simple. This DC earthing warning howler utilizes detection and the warning of built-in chip microcontroller state, it is not necessary to the system of supervision of external complex and wiring.
2) install simply. Employing standard clamping-rail is installed, and need not have a power failure, according to space in on-the-spot cabinet can type selecting type of alarm flexibly, fast simply.
3) each DC earthing warning howler is separate, it is possible to according to the increase and decrease flexible configuration of the different requirement of system and direct current system load.
4) safely, reliable. There is not electrical connection in DC earthing warning howler inner assembly and external system, direct current supply loop is not produced any impact; Adopting large-scale integrated chip design, sealing structure, strong anti-interference performance, environmental adaptation ability is strong.
5) detection sensitivity height. It is can detect within 25 kilo-ohms that relevant national standard requires DC earthing detection sensitivity to be stake resistance. And the present invention can reach 50 kilo-ohms, there is higher detection sensitivity.
What finally illustrate is, above embodiment is only in order to illustrate the technical scheme of the present invention and unrestricted, although with reference to better embodiment to invention has been detailed explanation, it will be understood by those within the art that, the technical scheme of the present invention can be modified or equivalent replacement, and not departing from objective and the scope of technical solution of the present invention, it all should be encompassed in the middle of the right of the present invention.
Claims (1)
1., based on a DC earthing warning howler for opening current dectector, it comprises:
Opening current dectector (1), for detecting the change of magnetic field strength caused by the leakage current of each branch road in direct-current secondary loop, and exports the electrical signal corresponding with described change of magnetic field strength;
Sound light alarming circuit (2), for sending report to the police light used and sound;
Signal detection processing module (3), for being detected by the electrical signal that opening current dectector (1) exports, and judges whether each branch road in described direct-current secondary loop exists ground fault, then starts sound light alarming circuit (2) as there is ground fault;
It is characterized in that: described opening current dectector (1) is arranged on the load-side of each branch road in tested direct-current secondary loop; The coil (5) that opening current dectector (1) comprises ring-type iron core (4) and is wrapped on ring-type iron core (4), described ring-type iron core (4) can be dismantled to combine by two and half ring-type iron cores and be formed, the first gap (6) and the 2nd gap (7) is formed between the end face of two and half ring-type iron cores, the width in the first gap (6) is greater than the width in the 2nd gap (7), being provided with magneto-resistive transducing device (8) in the first gap (6), the setting direction of magneto-resistive transducing device (8) is perpendicular to the cross section of the first gap (6);
The width L1 of described first gap (6) is 3mm, and the width L2 span in described 2nd gap (7) is: 0mm < L2��0.2mm;
Described signal detection processing module (3) comprises micro-chip, and the output signal of described magneto-resistive transducing device (8) is sent to the input port of micro-chip successively by amplification circuit and analog to digital converter; The output port of micro-chip loads initialize electric current by digital to analog converter and power magnification circuit to coil (5) successively;
This DC earthing warning howler also comprises display circuit, input through keyboard circuit and for carrying out the communicating circuit of data communication with detection main frame, and described display circuit, input through keyboard circuit and communicating circuit are all connected with micro-chip;
Described precision of A/D converter is 12, and digital to analog converter precision is 16.
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| CN201310166498.4A CN103364680B (en) | 2013-05-08 | 2013-05-08 | A kind of DC earthing warning howler based on opening current dectector |
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| CN201310166498.4A CN103364680B (en) | 2013-05-08 | 2013-05-08 | A kind of DC earthing warning howler based on opening current dectector |
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| CN103364680B true CN103364680B (en) | 2016-06-08 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109342881B (en) * | 2018-10-30 | 2024-02-09 | 国网福建省电力有限公司 | Open-close type ground loss signal sensor and transmission method |
| CN109633248B (en) * | 2019-02-02 | 2024-03-19 | 华润新能源(大同阳高)风能有限公司 | Monitoring circuit of direct current output loop |
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| CN203204114U (en) * | 2013-05-08 | 2013-09-18 | 重庆艾派科斯科技有限公司 | Direct current grounding alarm based on current detector with openings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5426360A (en) * | 1994-02-17 | 1995-06-20 | Niagara Mohawk Power Corporation | Secondary electrical power line parameter monitoring apparatus and system |
| CN201000474Y (en) * | 2007-02-05 | 2008-01-02 | 北京恒源利通电力技术有限公司 | Circuit fault indicator |
| CN102004179A (en) * | 2009-09-01 | 2011-04-06 | 天津市松正电动科技有限公司 | Magnetic induction current sensor for electric vehicle controller |
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