CN105375636A - Low-voltage distribution network zero-wire state detection apparatus and early warning method - Google Patents
Low-voltage distribution network zero-wire state detection apparatus and early warning method Download PDFInfo
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- CN105375636A CN105375636A CN201510889403.0A CN201510889403A CN105375636A CN 105375636 A CN105375636 A CN 105375636A CN 201510889403 A CN201510889403 A CN 201510889403A CN 105375636 A CN105375636 A CN 105375636A
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- zero line
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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- Emergency Alarm Devices (AREA)
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Abstract
The invention discloses a low-voltage distribution network zero-wire state detection apparatus. A zero-wire current detector, a zero-wire temperature detector, an environment temperature detector, an alarm and a communicator are connected with a data processor, and the data processor, the alarm and the communicator are enclosed in the housing. The invention further discloses an early warning method using the low-voltage distribution network zero-wire state detection apparatus. The method comprises the following steps: evaluating currents in a zero wire, a current temperature of the zero wire, a growth rate of the zero-wire currents relative to a previous time point and a growth rate of the zero-wire temperature relative to the previous time point, when one of the items exceeds a preset value, emitting alarm information through the alarm, and transmitting the alarm information back to a monitoring center through the communicator. The advantages are as follows: once one of the items exceeds the preset value, an alarm is emitted through the alarm to notify onsite work personnel, the alarm information can also be transmitted to a center machine room through the communicator for giving a remote early warning, detection and early warning are realized at the stage when an accident is still in its infancy, rapid processing can be carried out, and severe accidents are prevented.
Description
Technical field
The present invention relates to a kind of low-voltage network zero line condition checkout gear and method for early warning.
Background technology
In three-phase four-wire low-voltage electric power system, the effect of zero line is the current potential ensureing zero line when threephase load is asymmetric is zero, to eliminate neutral point potential change, makes each phase voltage keep symmetrical.Have a phase open circuit in three-phase, only can affect this phase load, and can not affect remaining two-phase, the electric equipment be connected in this two-phase still can normally work.If neutral line break, in the asymmetric situation of threephase load, neutral point displacement can be produced, thus cause triphasic potential uneven, some phase voltages are too low, and electric equipment can not normally use, and some phase current potentials are too high, then burn electric equipment, cause huge economic loss and serious social responsibility.
Usual two classes of existing zero line-breaking protector a: class is phase zero (cross or owe) voltage-type; Another kind of is 01 ground voltage types.
The basic functional principle of phase zero voltage-type is: voltage between sampling phase line and zero line, when system is normal, between phase line and zero line, voltage is normal value, i.e. power supply phase voltage, and now, protective device is failure to actuate.When there is broken string in zero line; between phase line with zero line, voltage (i.e. phase one no-voltage) effective value will exceed phase voltage (being called overvoltage) or be less than phase voltage (being called under voltage); reach protective device setting value and make its action; disengagement failure circuit; thus limit the life period of overvoltage or under voltage between PE linear contact lay voltage and phase 1, reach the protection to people and electrical equipment.
The basic functional principle of 01 ground voltage type protective devices is: protective device sampling load neutral point voltage to earth; when there is neutral line break fault, load neutral point produces drift potential; once reach the action setting value of protective device; then through certain time-delay actuator, automatic air-break switch is tripped, thus reach the protection to people and electrical appliance.
Zero line-breaking protector often concentrates on household electrical appliance or certain loads (as motor) protection, and the neutral line break protection paying close attention to distribution line is less; Neutral line break fault before protective device mounting points and can only equipment after protective device mounting points can only be detected; Unrealized distributed monitoring; Cannot judge the neutral line break under load balancing.
Most critical defect, zero line-breaking protector is the one protective device afterwards after neutral line break.
Neutral line break comprises two kinds of situations: outside destroy breaks suddenly, the overheated burning broken string of zero line.
It is the process of a gradual change that zero line blows, if can detect when accident rudiment and early warning, then can process rapidly, avoid the generation of serious accident.
Summary of the invention
The object of the present invention is to provide a kind of low-voltage network zero line condition checkout gear and method for early warning, effectively can solve and the overheated line that blows of zero line not monitored at present, easily cause the problem of serious accident.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions: a kind of low-voltage network zero line condition checkout gear, comprise neutral line current detector, zero line Temperature Detector, ambient temperature sensor, data processor, alarm device and communicator, described neutral line current detector, zero line Temperature Detector, ambient temperature sensor, alarm device, communicator are all connected with data processor, and described data processor, alarm device and communicator are enclosed in housing.
Preferably, also comprise display, described display is connected with data processor, and described display is fixed on housing; Display can facilitate staff to check current zero line status data at any time.
Preferably, described alarm device comprises stand by lamp and loudspeaker, and described stand by lamp is fixed on housing, and described housing has the saturating range of sound of band penetrable sound hole, described loudspeaker are fixed in the housing at rear, the range of sound; Send alarm warning by sound and light, be arranged in housing by loudspeaker simultaneously, prevent loudspeaker impaired, sound is sent by the penetrable sound hole in the saturating range of sound.
Preferably, the described range of sound is circular, described penetrable sound hole is distributed in the range of sound, the center in the described range of sound is fixed with the support column stretched in housing, the inner walls at the back side, the described range of sound is also fixed with hemispheric echo shell, the centre of sphere of described echo shell overlaps with the center of circle in the saturating range of sound, and the length of described support column is greater than 1/3rd of echo shell diameter and is less than 2/3rds of echo shell diameter, and the sounding face of described loudspeaker is towards the summit of echo shell; Support echo shell, the sound utilizing Principles of Acoustics to be sent by loudspeaker amplifies, under the prerequisite not increasing power and loudspeaker size, improve volume as far as possible.
Adopt a method for early warning for low-voltage network zero line condition checkout gear, comprise the following steps successively:
A, neutral line current detector and zero line Temperature Detector be fixed on need monitoring zero line on, in power transformation box ambient temperature sensor being fixed zero line place or power transformation box, the data returned data processor at regular intervals of neutral line current detector, zero line Temperature Detector and ambient temperature sensor monitoring;
B, the electric current in zero line, zero line temperature at that time, neutral line current to be assessed relative to the growth rate of previous moment, the growth rate of the relative previous moment of zero line temperature, when exceeding preset value for above-mentioned one, send warning information by alarm device, and pass this warning information back Surveillance center by communicator.
Compared with prior art, advantage of the present invention is: monitored zero line and place environment thereof by neutral line current detector, zero line Temperature Detector, ambient temperature sensor, these data returned data processors are analysed and compared, if exceed preset value, then given a warning by alarm device, notify field personnel, by communicator, warning information can also be sent to central machine room, carry out distant early warning, detect and early warning when accident rudiment, can process rapidly, avoid the generation of serious accident.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of low-voltage network zero line of the present invention condition checkout gear;
Fig. 2 is the shell structure schematic diagram of a kind of low-voltage network zero line of the present invention condition checkout gear;
Fig. 3 is the structural representation of echo shell in a kind of low-voltage network zero line of the present invention condition checkout gear.
Embodiment
Consult the embodiment that Fig. 1 is the present invention's a kind of low-voltage network zero line condition checkout gear and method for early warning, a kind of low-voltage network zero line condition checkout gear, comprise neutral line current detector 1, zero line Temperature Detector 2, ambient temperature sensor 3, data processor 4, display 8, alarm device 5 and communicator 6, described neutral line current detector 1, zero line Temperature Detector 2, ambient temperature sensor 3, alarm device 5, display 8, communicator 6 is all connected with data processor 4, described data processor 4, alarm device 5 and communicator 6 are enclosed in housing 7, described display 8 is fixed on housing 7, housing 7 can also be fixed on the antenna that communicator 6 connects.
As Fig. 1, shown in Fig. 2, described alarm device 5 comprises stand by lamp 9 and loudspeaker 10, described stand by lamp 9 is fixed on housing 7, described housing 7 has the saturating range of sound 12 of band penetrable sound hole 11, described loudspeaker 10 are fixed in the housing 7 at rear, the range of sound 12, the described range of sound 12 is circular, described penetrable sound hole 11 is distributed in the range of sound 12, the center in the described range of sound 12 is fixed with the support column 13 stretched in housing 7, as shown in Figure 3, housing 7 inwall at the back side, the described range of sound 12 is also fixed with hemispheric echo shell 14, the centre of sphere of described echo shell 14 overlaps with the center of circle in the saturating range of sound 12, the length of described support column 13 is greater than 1/3rd of echo shell 14 diameter and is less than 2/3rds of echo shell 14 diameter, the sounding face of described loudspeaker 10 is towards the summit of echo shell 14.
Adopt a method for early warning for low-voltage network zero line condition checkout gear, comprise the following steps successively:
A, neutral line current detector 1 and zero line Temperature Detector 2 be fixed on need monitoring zero line on, in power transformation box ambient temperature sensor 3 being fixed zero line place or power transformation box, the data returned data processor 4 at regular intervals of neutral line current detector 1, zero line Temperature Detector 2 and ambient temperature sensor 3 monitoring;
B, the electric current in zero line, zero line temperature at that time, neutral line current to be assessed relative to the growth rate of previous moment, the growth rate of the relative previous moment of zero line temperature, when exceeding preset value for above-mentioned one, send warning information by alarm device 5, and pass this warning information back Surveillance center by communicator 6.
Monitored by neutral line current detector 1, zero line Temperature Detector 2, ambient temperature sensor 3 pairs of zero lines and place environment thereof, these data returned data processors 4 are analysed and compared, if exceed preset value, then given a warning by alarm device 5, notify field personnel, by communicator 6, warning information can also be sent to central machine room, carry out distant early warning.
The foregoing is only specific embodiments of the invention, but technical characteristic of the present invention is not limited thereto, any those skilled in the art is in the field of the invention, and the change done or modification are all encompassed among the scope of the claims of the present invention.
Claims (5)
1. a low-voltage network zero line condition checkout gear, it is characterized in that: comprise neutral line current detector (1), zero line Temperature Detector (2), ambient temperature sensor (3), data processor (4), alarm device (5) and communicator (6), described neutral line current detector (1), zero line Temperature Detector (2), ambient temperature sensor (3), alarm device (5), communicator (6) is all connected with data processor (4), described data processor (4), alarm device (5) and communicator (6) are enclosed in housing (7).
2. a kind of low-voltage network zero line condition checkout gear as claimed in claim 1, it is characterized in that: also comprise display (8), described display (8) is connected with data processor (4), and described display (8) is fixed on housing (7).
3. a kind of low-voltage network zero line condition checkout gear as claimed in claim 1, it is characterized in that: described alarm device (5) comprises stand by lamp (9) and loudspeaker (10), described stand by lamp (9) is fixed on housing (7), described housing (7) is provided with the saturating range of sound (12) of band penetrable sound hole (11), and described loudspeaker (10) are fixed in the housing (7) at the range of sound (12) rear.
4. a kind of low-voltage network zero line condition checkout gear as claimed in claim 3, it is characterized in that: the described range of sound (12) are for circular, described penetrable sound hole (11) is distributed in the range of sound (12), the center in the described range of sound (12) is fixed with the support column (13) stretched in housing (7), housing (7) inwall at the described range of sound (12) back side is also fixed with hemispheric echo shell (14), the centre of sphere of described echo shell (14) overlaps with the center of circle of the saturating range of sound (12), the length of described support column (13) is greater than 1/3rd of echo shell (14) diameter and is less than 2/3rds of echo shell (14) diameter, the sounding face of described loudspeaker (10) is towards the summit of echo shell (14).
5. adopt a method for early warning for low-voltage network zero line condition checkout gear according to any one of Claims 1-4, it is characterized in that: comprise the following steps successively:
A, neutral line current detector (1) and zero line Temperature Detector (2) be fixed on need monitoring zero line on, by in the power transformation box at fixing for ambient temperature sensor (3) zero line place or power transformation box, the data returned data processor (4) at regular intervals that neutral line current detector (1), zero line Temperature Detector (2) and ambient temperature sensor (3) are monitored;
B, the electric current in zero line, zero line temperature at that time, neutral line current to be assessed relative to the growth rate of previous moment, the growth rate of the relative previous moment of zero line temperature, when exceeding preset value for above-mentioned one, send warning information by alarm device (5), and pass this warning information back Surveillance center by communicator (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510889403.0A CN105375636B (en) | 2015-12-05 | 2015-12-05 | A kind of low-voltage network zero line condition checkout gear and method for early warning |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510889403.0A CN105375636B (en) | 2015-12-05 | 2015-12-05 | A kind of low-voltage network zero line condition checkout gear and method for early warning |
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| CN105375636A true CN105375636A (en) | 2016-03-02 |
| CN105375636B CN105375636B (en) | 2018-01-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108038727A (en) * | 2017-12-11 | 2018-05-15 | 囯网河北省电力有限公司电力科学研究院 | A kind of method, system and terminal device that differentiated service is provided |
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| CN103036197A (en) * | 2012-12-13 | 2013-04-10 | 宁波电业局 | Protective device of broken zero line for low-pressure power utilization system |
| CN104349223A (en) * | 2013-07-29 | 2015-02-11 | 雅瑟音响股份有限公司 | Sound box and manufacturing method thereof |
| CN205123421U (en) * | 2015-12-05 | 2016-03-30 | 国网浙江省电力公司丽水供电公司 | Low voltage network zero line state detection device |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101136546A (en) * | 2007-08-22 | 2008-03-05 | 董右云 | Intelligentized electric energy management system assembled device |
| US20120133429A1 (en) * | 2008-02-15 | 2012-05-31 | Shenzhen Jiayilai Industry Co., Ltd | Electronic Power-Saving Device |
| CN102104278A (en) * | 2009-12-18 | 2011-06-22 | 陈家斌 | Power supply intelligent system of cell |
| CN103036197A (en) * | 2012-12-13 | 2013-04-10 | 宁波电业局 | Protective device of broken zero line for low-pressure power utilization system |
| CN104349223A (en) * | 2013-07-29 | 2015-02-11 | 雅瑟音响股份有限公司 | Sound box and manufacturing method thereof |
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| CN108038727A (en) * | 2017-12-11 | 2018-05-15 | 囯网河北省电力有限公司电力科学研究院 | A kind of method, system and terminal device that differentiated service is provided |
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| CN105375636B (en) | 2018-01-19 |
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