CN101950943B - On-line monitoring protection method and device for distributed zero line breakage - Google Patents
On-line monitoring protection method and device for distributed zero line breakage Download PDFInfo
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- CN101950943B CN101950943B CN201010220891.3A CN201010220891A CN101950943B CN 101950943 B CN101950943 B CN 101950943B CN 201010220891 A CN201010220891 A CN 201010220891A CN 101950943 B CN101950943 B CN 101950943B
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Abstract
本发明涉及一种主要用于电力行业的一种分布式零线断线在线监测保护方法及装置，使用小信号发生装置和小信号感应装置以供电回路信号远程注入法进行分布式零线断线检测。在入户开关处安装所述小信号发生装置，将产生的零线断线监测信号由远程节点处注入配电系统，经过供电变压器内部绕组和零线回到信号注入处，构成了整个检测回路。同时在供电侧的负荷开关零线上安装所述小信号感应装置，通过检测零线断线监测信号来判定供电回路是否发生了零线断线故障，一旦发生零线断线，自动快速分断负荷开关，以保护用户侧的设备和线路，并且将发生零线断线的相关参数上传到主站管理平台，实现网络化管理诊断，可靠性高、信息化管理，具有技术前沿性。
The present invention relates to a distributed zero line disconnection online monitoring and protection method and device mainly used in the electric power industry, which uses a small signal generating device and a small signal sensing device to perform distributed zero line disconnection with a remote injection method of a power supply loop signal detection. The small signal generating device is installed at the entrance switch, and the generated neutral line disconnection monitoring signal is injected into the power distribution system from the remote node, and returned to the signal injection point through the internal winding and neutral line of the power supply transformer, forming the entire detection circuit . At the same time, the small-signal sensing device is installed on the zero line of the load switch on the power supply side to determine whether the zero line breakage fault has occurred in the power supply circuit by detecting the zero line breakage monitoring signal. Once the zero line breakage occurs, the load is automatically and quickly disconnected switch to protect the equipment and lines on the user side, and upload the relevant parameters of the neutral line disconnection to the main station management platform to realize network management and diagnosis, high reliability, information management, and technological frontier.
Description
Technical field
The present invention relates to a kind of guard method of a kind of distributed neutral line break on-line monitoring and device that is mainly used in power industry.
Background technology
In operation of power networks process, the accident such as burn because neutral line break causes system equipment, on fire occurs often, and power department supply transformer in the urgent need to address is to the neutral line break protection of the supply line between place of registering one's residence.Zero line-breaking protector in the market has two classes conventionally: a class is phase zero voltage-type, and another kind of is zero-ground voltage type.The basic functional principle of phase zero voltage-type protective device is: voltage between sampling phase line and zero line, when system is normal, between phase line and zero line, voltage is normal value, it is power supply phase voltage, now protective device is failure to actuate, when there is broken string in zero line, voltage between phase line and zero line (mutually a no-voltage) effective value will or be less than phase voltage (being called under voltage) over phase voltage (being called overvoltage), reach protective device setting value and make its action, disengagement failure circuit, thereby restriction PE line touch voltage and the mutually life period of overvoltage or under voltage between one zero, reach the protection to people and electrical equipment, the basic functional principle of zero-ground voltage type protective device 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, through certain time-delay actuator, make automatic air-break switch tripping operation, thereby reach the protection to people and electrical appliance.The zero line break protection device of existing this two type is deposited problem in the following areas: the construction of zero-ground voltage type protective device is complicated, cannot guarantee reliable ground; Phase zero voltage-type, zero-ground voltage type protective device need originally connect switch or the replacement of distribution master switch in case, and quantity is too many, invests too greatly, and construction volume is too large; To the neutral line break under load balancing, cannot judge, and the type protector is general all for the protection of the protection of household electricity or certain loads (as motor etc.), cannot accomplish the protection of the whole piece circuit after the neutral line break on low-voltage distributing line.
Summary of the invention
In order to overcome the above-mentioned defect of prior art; the invention provides the guard method of a kind of distributed neutral line break on-line monitoring and device; the method has proposed innovatively use current supply circuit signal Remote create method and has carried out distributed neutral line break detection; overcome conventional neutral line break and detected the limitation that can only detect the neutral line break before mounting points and can only protect equipment after mounting points, improved electric network security.
The technical solution adopted for the present invention to solve the technical problems is to use small-signal generating means and small-signal induction installation to carry out distributed neutral line break detection with power supply loop signal Remote create method.Described current supply circuit signal Remote create method; it is characterized in that, at the end of the circuit that needs protection, small-signal generating means of the present invention is installed; the small-signal producing is injected to distribution system by remote node place; through the inner winding of supply transformer and zero line, get back to signal injection place, so just formed whole detection loop.Described small-signal induction installation is installed simultaneously on the on-load switch zero line of supply side; whether this device exists for detection of the current supply circuit small-signal of Remote create; once blackout and on-load switch place be detected, occur that phase voltage just judges that broken string has occurred zero line; automatically quick disjunction on-load switch; equipment and the circuit of protection user side; and the relevant parameter that neutral line break occurs is uploaded to main website management platform, realize network management diagnosis.Described small-signal generating means is connected with three-phase equilibrium reactance and three phase lines, according to magnetic balance principle, when circuit threephase load balance, reactance neutral point P will be in fictitious zero potential state, small-signal generating means is injected into neutral line break monitor signal in three phase lines by three-phase equilibrium reactance, by the winding loop of supply transformer, get back to zero line N upper, completed the injection of signal; Even if threephase load, in non-equilibrium state, can provide alternating current path by small-signal generating means, make P point still for fictitious zero potential state, injection that equally can settling signal.Described small-signal induction installation, the homemade transducer of its positive magnetoresistance by bridge structure, it is characterized in that according to principle of giant magnetic effect, utilize giant magnetoresistance to measure alternating current-direct current signal to the sensitiveness in magnetic field, waveform to induction installation output carries out digital filtering and amplification, make its sensitivity and the precision induction and the measurement that meet neutral line break detection signal, and apparatus structure is designed to non-core-theaded type, convenient installation.
The invention has the beneficial effects as follows and proposed innovatively distributed neutral line break monitoring thinking: use current supply circuit signal Remote create method, design small-signal generating means and small-signal induction installation, carry out network management diagnosis.Method is easy, simple in structure, feasibility is high, reliability is strong, information system management, and forward position possesses skills.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of distributed neutral line break on-line monitoring provided by the invention guard method and device;
Fig. 2 is the schematic diagram of a kind of distributed neutral line break on-line monitoring provided by the invention guard method and device connecting system;
Fig. 3 is the equivalent electric circuit that a kind of distributed neutral line break on-line monitoring provided by the invention guard method and device detect principle.
Embodiment
As shown in Figure 1, a kind of distributed neutral line break on-line monitoring of the present invention guard method and device comprise small-signal generating means 1, neutral line break monitor signal 2, three-phase equilibrium reactance 3, small-signal induction installation 4.
As shown in Figure 2, a kind of distributed neutral line break on-line monitoring of the present invention guard method and installation site and the Monitoring Line of device in distribution system.Described method is, at the end of the circuit that needs protection, described small-signal generating means 1 is installed; the neutral line break monitor signal 2 producing is injected to distribution system by remote node place; through the inner winding of supply transformer and zero line, get back to signal injection place, so just formed whole detection loop.Described small-signal induction installation 4 is installed simultaneously on the on-load switch zero line of supply side; whether this device exists for detection of the current supply circuit neutral line break monitor signal 2 of Remote create; once blackout and on-load switch place be detected, occur that phase voltage just judges that broken string has occurred zero line; automatically quick disjunction on-load switch, to protect equipment and the circuit of user's side.
Described small-signal generating means 1 is connected with three-phase equilibrium reactance 3 and three phase lines, according to magnetic balance principle, when circuit threephase load balance, reactance neutral point P will be in fictitious zero potential state, small-signal generating means 1 is injected into neutral line break monitor signal 2 in three phase lines by three-phase equilibrium reactance 3, by the winding loop of supply transformer, get back to zero line N upper, completed the injection of signal; Even if threephase load, in non-equilibrium state, can provide alternating current path by small-signal generating means 1, make P point still for fictitious zero potential state, injection that equally can settling signal.
Described small-signal induction installation 4 makes by the positive magnetoresistance of bridge structure the transducer forming by oneself, it is characterized in that according to principle of giant magnetic effect, utilize giant magnetoresistance to measure alternating current-direct current signal to the sensitiveness in magnetic field, waveform to induction installation output carries out digital filtering and amplification, make its sensitivity and the precision induction and the measurement that meet neutral line break detection signal, and apparatus structure is designed to non-core-theaded type, convenient installation.
As shown in Figure 3; the guard method of described a kind of distributed neutral line break on-line monitoring and device detect the equivalent electric circuit of principle; in figure, Rr, Rt are respectively supply transformer winding and three-phase equilibrium X-bridge; numerical value very I is ignored; Ru is user load equivalent resistance; small-signal generating means FSQ injects neutral line break monitor signal to three-phase simultaneously, and small-signal induction installation GYQ judges by detecting neutral line break monitor signal whether current supply circuit neutral line break fault has occurred.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010220891.3A CN101950943B (en) | 2010-07-07 | 2010-07-07 | On-line monitoring protection method and device for distributed zero line breakage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010220891.3A CN101950943B (en) | 2010-07-07 | 2010-07-07 | On-line monitoring protection method and device for distributed zero line breakage |
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| CN101950943A CN101950943A (en) | 2011-01-19 |
| CN101950943B true CN101950943B (en) | 2014-03-26 |
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| CN201010220891.3A Expired - Fee Related CN101950943B (en) | 2010-07-07 | 2010-07-07 | On-line monitoring protection method and device for distributed zero line breakage |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638024B (en) * | 2012-04-16 | 2015-08-26 | 北京航天发射技术研究所 | Interruption line protector |
| CN107015118A (en) * | 2017-05-05 | 2017-08-04 | 广东正力通用电气有限公司 | A kind of supply lines break monitoring system and method |
| CN107064716A (en) * | 2017-05-05 | 2017-08-18 | 广东正力通用电气有限公司 | A kind of power transmission line break monitoring system and method |
| CN110907860A (en) * | 2019-12-06 | 2020-03-24 | 国网河南省电力公司南阳供电公司 | Detector for disconnection of secondary circuit in substation and method of using the same |
| CN113805098B (en) * | 2021-08-23 | 2024-07-30 | 浙江聚创智能科技有限公司 | Zero line breakage detection system and method for three-phase four-wire system power supply line |
| CN116774105B (en) * | 2022-03-11 | 2026-05-15 | 浙江正泰电器股份有限公司 | Zero-out detection method and equipment with zero-out detection function |
| CN115389853A (en) * | 2022-09-30 | 2022-11-25 | 深圳供电局有限公司 | A device and method for detecting potential safety hazards in protective grounding systems |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100357749C (en) * | 2005-10-08 | 2007-12-26 | 华北电力大学（北京） | Zero-line and breakage detector of three-phase and four-line system |
| JP2010510500A (en) * | 2006-11-24 | 2010-04-02 | ジェミナ アセット マネージメント （６） ピーティーワイ リミテッド | Power monitoring system |
| CN201038715Y (en) * | 2007-01-11 | 2008-03-19 | 华北电力大学 | Neutral line disconnection detection protection device |
| CN101179191B (en) * | 2007-11-07 | 2010-10-13 | 北京四方继保自动化股份有限公司 | Method for protector to detect disconnection of neutral line using third harmonic |
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