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
The invention relates to an on-line monitoring protection method and an on-line monitoring protection device for distributed zero line breakage, which are mainly applied in the power industry. A small signal generating device and a small signal induction device are used for distributed zero line breakage detection by a power supply loop signal remote injection method. The small signal generating device is arranged at a door switch, a generated zero line breakage monitoring signal is injected to a distribution system from a remote node, and the signal returns to the signal injection part from an internal winding of a power supply transformer and a zero line to form a whole detection loop. Meanwhile, the small signal induction device is arranged on a load switch zero line of a power supply side, judges whether the power supply loop has zero line breakage fault by detecting the zero line breakage monitoring signal, automatically and quickly cuts off the load switch once the zero line breakage happens to protect equipment and lines of a user side, and uploads the related parameters of the zero line breakage to a master station management platform. The method and the device realize network-based management and diagnosis, and have high reliability, information-based management and technical leading property.
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)
1. a distributed neutral line break on-line monitoring protective device, is characterized in that: small-signal generating means (1), three-phase equilibrium reactance (3), small-signal induction installation (4), consist of; Described small-signal generating means (1) is connected with three-phase equilibrium reactance (3), and a kind of small-signal occurs, neutral line break monitor signal (2); Three phase lines of described three-phase equilibrium reactance (3) and distribution system (A, B, C) are connected; Described small-signal induction installation (4) is connected with the zero line (N) of the on-load switch of system power supply side.
2. a kind of distributed neutral line break on-line monitoring protective device as claimed in claim 1, is characterized in that described small-signal generating means (1) injects distribution system according to magnetic balance principle by described neutral line break monitor signal (2); When distribution system circuit threephase load balance, three-phase equilibrium reactance (3) neutral point P will be in fictitious zero potential state, described small-signal generating means (1) is injected into described 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 neutral line break monitor signal (2); When the threephase load of distribution system circuit is during in non-equilibrium state, described small-signal generating means (1) provides alternating current path, make three-phase equilibrium reactance (3) neutral point P in fictitious zero potential state, to complete the injection of neutral line break monitor signal (2).
3. a kind of distributed neutral line break on-line monitoring protective device as claimed in claim 2, is characterized in that the bridge structure formula inductive pick-up that described small-signal induction installation (4) utilizes giant magnetoresistance to build; According to principle of giant magnetic effect, utilize giant magnetoresistance to measure alternating current-direct current signal to the sensitiveness in magnetic field, i.e. described neutral line break monitor signal (2); Small-signal induction installation (4) adopts non-core-theaded type access distribution system.
4. a distributed neutral line break on-line monitoring guard method, is characterized in that described method is with a kind of distributed neutral line break on-line monitoring protective device as claimed in claim 1, to realize monitoring, protection and the network management diagnosis of distributed neutral line break in distribution system.
5. a kind of distributed neutral line break on-line monitoring as claimed in claim 4 guard method, it is characterized in that current supply circuit signal Remote create method, at the end of the circuit that needs protection, small-signal generating means of the present invention (1) is installed, by the small-signal producing, be that described neutral line break monitor signal (2) injects 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 monitoring circuit, described small-signal induction installation (4) is installed simultaneously on the on-load switch zero line of supply side, for monitoring neutral line break monitor signal (2) described in the current supply circuit of Remote create, whether exist, once monitor, described neutral line break monitor signal (2) disappears and on-load switch place occurs that phase voltage is just judged to be zero line broken string has occurred, and automatically quick disjunction on-load switch, equipment and circuit with protection user side.
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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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| 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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| CN102638024B (en) * | 2012-04-16 | 2015-08-26 | 北京航天发射技术研究所 | Interruption line protector |
| 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 |
| 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 |
| CN110907860A (en) * | 2019-12-06 | 2020-03-24 | 国网河南省电力公司南阳供电公司 | Transformer substation secondary circuit disconnection detector and use method thereof |
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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 |
| WO2008061321A1 (en) * | 2006-11-24 | 2008-05-29 | Alinta Asset Management Pty Ltd | Power supply monitoring system |
| CN201038715Y (en) * | 2007-01-11 | 2008-03-19 | 华北电力大学 | Neutral conductor breakage detecting and 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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