CN103280784A - Neutral line breakage protection method and neutral line breakage protector - Google Patents
Neutral line breakage protection method and neutral line breakage protector Download PDFInfo
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- CN103280784A CN103280784A CN2013102075811A CN201310207581A CN103280784A CN 103280784 A CN103280784 A CN 103280784A CN 2013102075811 A CN2013102075811 A CN 2013102075811A CN 201310207581 A CN201310207581 A CN 201310207581A CN 103280784 A CN103280784 A CN 103280784A
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Abstract
The invention relates to the technical field of power supply and consumption technical protection of low-voltage distribution transformers, and discloses a neutral line breakage protection method and a neutral line breakage protector. The neutral line breakage protector comprises a voltage sampling circuit, a radio transmitter, a radio receiving controller and a residual current protector, wherein the voltage sampling circuit is connected with the radio receiving controller through the radio transmitter in a wireless mode, and the radio receiving controller is connected to a phase line A, a phase line B and a phase line C of three phases of the initial end of a 400V distribution line through the residual current protector. The neutral line breakage protection method and the neutral line breakage protector can avoid various accidents caused by line breakage of a neutral line, improves protection measures of line breakage of the neutral line, improves the technological level of a distribution network of an electric system, and completely eradicates or reduces economic loss caused by line breakage of the neutral line to our country, people and electric power enterprises. Voltage quality of power supply is improved, and high-quality service resources of the electric power enterprises are developed.
Description
Technical field
The present invention relates to low voltage distribution transformer electricity supply and use technology guard technology field; be applicable in the distribution transformer neutral earthing system a kind of broken neutral line guard method and the neutral conductor interrupted protective equipment of overvoltage protection when the broken neutral line distribution circuit electric voltage is uneven.
Background technology
In order to prevent broken neutral line neutral point shift voltage drift imbalance of three-phase voltage, at the neutral line iterative earthing is installed, there are several thousand low-voltage networks in a power supply enterprise at county level, need up to ten thousand earth electrodes, expense is very big, and the iterative earthing effect is also not obvious.The total earth leakage protective device of voltage-type progressively withdrawed from low-voltage network in the last few years.Promote residual current operated protective device.Only always protecting the CT zero sequence current mutual inductor in distribution neutral point and current mode is connected one point earth with the earth, can not iterative earthing.This increases the risk that the household electrical appliance overvoltage burns out again concerning the neutral point broken string.
Mainly adopt various precautionary measures at present.Reinforcement goes out the ray examination maintenance to the walkaround inspection of circuit to distribution transforming, can only play prevention effect, can not guarantee that the neutral line is continuous, improper when safeguarding, strong wind, when freezing extreme weather human factor causes the neutral line to break down, cause the displacement of distribution transforming neutral point, indivedual phase voltages raise, burn out the household electrical appliance accident and happen occasionally, a county will have several every year according to statistics, meeting initiation fire and personal injury when serious, cause than the large economy loss for national wealth and people's interests, cause harmful effect and economic loss to power supply department.
Summary of the invention
Burn out even cause fire hazard in order to solve the household electrical appliance that low voltage distribution transformer broken neutral line neutral point shift voltage drift imbalance of three-phase voltage causes, the invention provides a kind of broken neutral line guard method and neutral conductor interrupted protective equipment.
In order to realize that the present invention of foregoing invention purpose adopts following technical scheme:
A kind of neutral conductor interrupted protective equipment, comprise: voltage sample circuit, transmitting set, radio reception controller, residual current operated protective device, described voltage sample circuit is by transmitting set and the wireless connections of radio reception controller, and the radio reception controller is connected on phase line A, phase line B, the phase line C line of 400V distribution line top three-phase by residual current operated protective device; Described voltage sample circuit is by three road signal acquisition circuits, and the input of three road signal acquisition circuits is connected with phase line A, phase line B, the phase line C line of three-phase respectively; The output parallel connection of three road signal acquisition circuits links to each other with the transmitting set input.
A kind of broken neutral line guard method, its step is as follows:
A. at the end point detection neutral line O of 400V distribution line and the phase line A of triple line, or on the line voltage between phase line B or the phase line C signal picker is installed, signal picker is by three road signal acquisition circuits, and the input of three road signal acquisition circuits is connected with phase line A, phase line B, the phase line C line of three-phase respectively;
B. behind 400 volts of distribution transformer broken neutral lines, neutral point displacement imbalance of three-phase voltage, the big phase line drop of loading is low, the one phase line voltage of loading little raises, a too high phase line voltage, by one road signal acquisition circuit of signal picker correspondence, the signal that phase line voltage is raise transfers to transmitting set by optocoupler;
C. transmitting set is by the wireless signal of telecommunication that phase line voltage raises that sends of encoding;
D. be positioned at the radio reception controller of 400V distribution line source end; the signal of telecommunication that the phase line voltage that receives is raise; show by amplification, decoding, audible and visual alarm; and the residual current operated protective device would trip is carried out in instruction; make 400V distribution line interlock protection tripping operation; the power supply of the unusual circuit of off voltage, protection household electrical appliance and power consumption equipment.
Because adopt above-mentioned means, the present invention has following superiority:
A kind of broken neutral line guard method and neutral conductor interrupted protective equipment; have short action of time and have the demonstration of multichannel broken string light soon; be convenient to the distribution transforming administrative staff and show judgement power failure reason to on-the-spot according to light; when raising suddenly or reduce, voltage can not cause damage to Household Appliance equipment; can effectively stop to cause fire because the rising of broken neutral line voltage burns out Household Appliance equipment, making electric power enterprise that the another measure of qualified voltage quality is provided is the extension of good service activity.
The present invention can detect any phase voltage behind broken neutral line; in the several seconds, utilize radiotechnics to carry out distant place control residual current operated protective device when floating to set point and carry out would trip; thereby all kinds of accidents of avoiding broken neutral line to cause; improve the safeguard measure of broken neutral line and improve the technical merit of system for distribution network of power network, stop or reduce the economic loss of causing for country and appointment and electric power enterprise because of broken neutral line.Improve quality of voltage, exploitation electric power enterprise good service resource.Innovation is combated a natural disaster, the mitigation means, and this difficult problem that is difficult to for a long time thoroughly solve is broken through.
Description of drawings
Fig. 1 is the neutral conductor interrupted protective equipment block diagram;
Fig. 2 is broken neutral line protection transmitting set circuit diagram;
Fig. 3 is broken neutral line protection radio reception controller circuitry figure;
Specific implementation method
As shown in Figure 1, 2, 3, a kind of neutral conductor interrupted protective equipment, comprise: voltage sample circuit, transmitting set, radio reception controller, residual current operated protective device, described voltage sample circuit is by transmitting set and the wireless connections of radio reception controller, and the radio reception controller is connected on phase line A, phase line B, the phase line C line of 400V distribution line top three-phase by residual current operated protective device; Described voltage sample circuit is by three road signal acquisition circuits, and the input of three road signal acquisition circuits is connected with phase line A, phase line B, the phase line C line of three-phase respectively; The output parallel connection of three road signal acquisition circuits links to each other with the transmitting set input.
A kind of broken neutral line guard method, its step is as follows:
A. at the end point detection neutral line O of 400V distribution line and the phase line A of triple line, or on the line voltage between phase line B or the phase line C signal picker is installed, signal picker is by three road signal acquisition circuits, and the input of three road signal acquisition circuits is connected with phase line A, phase line B, the phase line C line of three-phase respectively;
B. behind 400 volts of distribution transformer broken neutral lines, neutral point displacement imbalance of three-phase voltage, the big phase line drop of loading is low, the one phase line voltage of loading little raises, a too high phase line voltage, by one road signal acquisition circuit of signal picker correspondence, the signal that phase line voltage is raise transfers to transmitting set by optocoupler;
C. transmitting set is by the wireless signal of telecommunication that phase line voltage raises that sends of encoding;
D. be positioned at the radio reception controller of 400V distribution line source end; the signal of telecommunication that the phase line voltage that receives is raise; show by amplification, decoding, audible and visual alarm; and the residual current operated protective device would trip is carried out in instruction; make 400V distribution line interlock protection tripping operation; the power supply of the unusual circuit of off voltage, protection household electrical appliance and power consumption equipment.
The present invention be according to distribution transformer supply district, go out number of lines, on the terminal line bar of every outlet or in the distribution box with A, B, three phase lines of C and neutral line O(or zero line) insert power source voltage sample circuit module respectively; At the end point detection neutral line O of 400V distribution line and the phase line A of three-phase, or line overtension between phase line B or the phase line C, give transmitting set by voltage sample circuit module by signal collector, send the overvoltage signal that has coding through transmitting set.In the power distribution cabinet at 400V distribution line top or on the screen wireless receiving antenna being installed receives, through the radio reception controller, demodulate the pulse signal that the has coding pairing of decoding, and send actuating signal to residual current operated protective device and carry out tripping operation, the ac contactor coil voltage that residual current operated protective device disconnects outlet makes the tripping operation of A.C. contactor loss of excitation, makes the tripping operation of 400V distribution line protection; Thereby cut off because of the unusual circuit of the three-phase voltage that causes behind the broken neutral line, stop the fire incident that burns out household electrical appliance, power consumption equipment and cause that overtension causes.400V distribution line top.
Claims (2)
1. neutral conductor interrupted protective equipment, it is characterized in that: comprising: voltage sample circuit, transmitting set, radio reception controller, residual current operated protective device, described voltage sample circuit is by transmitting set and the wireless connections of radio reception controller, and the radio reception controller is connected on phase line A, phase line B, the phase line C line of 400V distribution line top three-phase by residual current operated protective device; Described voltage sample circuit is by three road signal acquisition circuits, and the input of three road signal acquisition circuits is connected with phase line A, phase line B, the phase line C line of three-phase respectively; The output parallel connection of three road signal acquisition circuits links to each other with the transmitting set input.
2. broken neutral line guard method, it is characterized in that: its step is as follows:
A. at the end point detection neutral line O of 400V distribution line and the phase line A of triple line, or on the line voltage between phase line B or the phase line C signal picker is installed, signal picker is by three road signal acquisition circuits, and the input of three road signal acquisition circuits is connected with phase line A, phase line B, the phase line C line of three-phase respectively;
B. behind 400 volts of distribution transformer broken neutral lines, neutral point displacement imbalance of three-phase voltage, the big phase line drop of loading is low, the one phase line voltage of loading little raises, a too high phase line voltage, by one road signal acquisition circuit of signal picker correspondence, the signal that phase line voltage is raise transfers to transmitting set by optocoupler;
C. transmitting set is by the wireless signal of telecommunication that phase line voltage raises that sends of encoding;
D. be positioned at the radio reception controller of 400V distribution line source end; the signal of telecommunication that the phase line voltage that receives is raise; show by amplification, decoding, audible and visual alarm; and the residual current operated protective device would trip is carried out in instruction; make 400V distribution line interlock protection tripping operation; the power supply of the unusual circuit of off voltage, protection household electrical appliance and power consumption equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013102075811A CN103280784A (en) | 2013-05-30 | 2013-05-30 | Neutral line breakage protection method and neutral line breakage protector |
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| CN2013102075811A CN103280784A (en) | 2013-05-30 | 2013-05-30 | Neutral line breakage protection method and neutral line breakage protector |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158149A (en) * | 2014-07-10 | 2014-11-19 | 国家电网公司 | Intelligent leakage protector provided with broken null line protection function and broken null line protection method |
| CN105226634A (en) * | 2014-05-27 | 2016-01-06 | 首瑞（北京）投资管理集团有限公司 | A kind of (TT) distribution system |
| CN113466742A (en) * | 2021-08-02 | 2021-10-01 | 江苏大学 | 110kV line self-adaptive disconnection protection method based on transformer low-voltage lateral line voltage |
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| JP2003199245A (en) * | 2001-12-25 | 2003-07-11 | Mitsubishi Electric Corp | Ground relay system in multiple direct earth system |
| CN202840471U (en) * | 2012-10-19 | 2013-03-27 | 山东电力集团公司日照供电公司 | Low-voltage neutral line brake protection system based on PMU (power management unit) synchronous phasor measurement |
| CN103066695A (en) * | 2011-10-24 | 2013-04-24 | 徐多荣 | Intelligent power grid remote control protection alarming system |
| CN203352152U (en) * | 2013-05-30 | 2013-12-18 | 国家电网公司 | Neutral wire disconnection protector |
-
2013
- 2013-05-30 CN CN2013102075811A patent/CN103280784A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003199245A (en) * | 2001-12-25 | 2003-07-11 | Mitsubishi Electric Corp | Ground relay system in multiple direct earth system |
| CN103066695A (en) * | 2011-10-24 | 2013-04-24 | 徐多荣 | Intelligent power grid remote control protection alarming system |
| CN202840471U (en) * | 2012-10-19 | 2013-03-27 | 山东电力集团公司日照供电公司 | Low-voltage neutral line brake protection system based on PMU (power management unit) synchronous phasor measurement |
| CN203352152U (en) * | 2013-05-30 | 2013-12-18 | 国家电网公司 | Neutral wire disconnection protector |
Non-Patent Citations (1)
| Title |
|---|
| 王勇等: "实现三相四线制供电系统中性线断线保护智能装置的研究", 《低压电器》, no. 5, 15 March 2011 (2011-03-15) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226634A (en) * | 2014-05-27 | 2016-01-06 | 首瑞（北京）投资管理集团有限公司 | A kind of (TT) distribution system |
| CN104158149A (en) * | 2014-07-10 | 2014-11-19 | 国家电网公司 | Intelligent leakage protector provided with broken null line protection function and broken null line protection method |
| CN113466742A (en) * | 2021-08-02 | 2021-10-01 | 江苏大学 | 110kV line self-adaptive disconnection protection method based on transformer low-voltage lateral line voltage |
| CN113466742B (en) * | 2021-08-02 | 2022-09-13 | 江苏大学 | 110kV line self-adaptive disconnection protection method based on transformer low-voltage lateral line voltage |
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Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: ELECTRIC POWER CO., LTD., MENGJIN COUNTRY Effective date: 20130929 Owner name: ELECTRIC POWER CO., LTD., MENGJIN COUNTRY Effective date: 20130929 |
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Free format text: CORRECT: ADDRESS; FROM: 471100 LUOYANG, HENAN PROVINCE TO: 100031 XICHENG, BEIJING |
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Effective date of registration: 20130929 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: Mengjin County Electric Power Company Address before: The Yellow River Road, Chengguan town in Mengjin County of Henan city of Luoyang province 471100 Applicant before: Mengjin County Electric Power Company |
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Application publication date: 20130904 |