CN105811368A - Self-adaptive zero line broken protection device and system - Google Patents
Self-adaptive zero line broken protection device and system Download PDFInfo
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- CN105811368A CN105811368A CN201610239799.9A CN201610239799A CN105811368A CN 105811368 A CN105811368 A CN 105811368A CN 201610239799 A CN201610239799 A CN 201610239799A CN 105811368 A CN105811368 A CN 105811368A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
- H02H3/353—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system involving comparison of phase voltages
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
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Abstract
The invention discloses a self-adaptive zero line broken protection device. The self-adaptive zero line broken protection device comprises three phase line incoming terminals, three phase line outgoing terminals, a zero line incoming terminal, a zero line outgoing terminal, a current transformer, three voltage converters, a data processing unit, a switching quantity output circuit and a circuit breaker, wherein the current transformer is connected in serial between the zero line incoming terminal and the zero line outgoing terminal, the three-phase line incoming terminals and the three-phase line outgoing terminals are connected through the circuit breaker, each phase line incoming terminal and the zero line incoming terminal form a group of terminal to be connected in parallel to the input end of one of the voltage converters, the output ends of the three voltage converters and the current transformer are accessed to the data processing unit, and the data processing unit is connected with the circuit breaker by the switching quantity output circuit. The invention also discloses a self-adaptive zero line broken protection system. With the adoption of the device and the system, the zero-breaking detection function can be achieved by measuring three phase load voltages and zero line current, and the loss caused by zero line broken running is effectively reduced.
Description
Technical field
The present invention relates to low voltage electrical apparatus technology field, particularly relate to a kind of adaptivity zero line break protection device and a kind of adaptivity neutral line break protection system.
Background technology
The low voltage equipment overwhelming majority adopts three phase supply.During low-voltage distribution system neutral line break, user side neutral point voltage can offset, and causes that large area burns consumer electronics, brings very big economic loss to user, even causes accident of human electric shock.Therefore, accurately detecting the neutral line break of low-pressure system and take Reasonable Protection measure, property and personal safety to protection user are significant.
At present, the chopper that low-pressure system adopts all detects function without neutral line break, and neutral line break protection philosophy proposed at present may produce misoperation when threephase load degree of asymmetry is very big.
Summary of the invention
The technical problem to be solved is in that, it is provided that adaptivity zero line break protection device that a kind of simple in construction, accuracy are high and system, it may be achieved detection function off zero.
In order to solve above-mentioned technical problem; the invention provides a kind of adaptivity zero line break protection device; including component, described component includes three-phase phase line lead-in wire terminal, three-phase phase line outlet terminal, zero line lead-in wire terminal, zero line outlet terminal, power pack, three voltage changers, data processing unit, switching value output circuit and chopper；Concatenating described power pack between described zero line lead-in wire terminal and zero line outlet terminal, described power pack gathers the electric current I on zero line0；It is connected by described chopper between described three-phase phase line lead-in wire terminal and three-phase phase line outlet terminal, each phase line lead-in wire terminal constitutes one group of terminal group with zero line lead-in wire terminal and accesses the input of a voltage changer, and each voltage changer gathers the load voltage U between phase line lead-in wire terminal and zero line lead-in wire terminal accessed respectivelyAN、UBN、UCN；The outfan of described three voltage changers and power pack access data processing unit, described data processing unit is connected with chopper by switching value output circuit, and load voltage that described data processing unit gathers according to voltage changer and the electric current of power pack collection judge zero line situation and to switching value output circuit output control signal.
Improvement as such scheme, according to the load voltage of voltage changer collection and the electric current of power pack collection, described data processing unit judges that the method for zero line situation includes: contrast described load voltage, if the absolute value of the difference of any two load voltage is no more than adaptive voltage, then represent that zero line is normal, otherwise neutral line break, wherein, described adaptive voltage is (k+p) Un, k is fixing constant coefficient, and p is self-adaptative adjustment coefficient, UnFor rated voltage.
As the improvement of such scheme, described self-adaptative adjustment coefficientWherein, m=I0/max{UAN,UBN,UCN}。
As the improvement of such scheme, described fixing constant coefficient k is 0.15～0.2.
As the improvement of such scheme, described adaptivity zero line break protection device also includes the communication module for sending fault-signal to terminal, and described communication module is connected with switching value output circuit.
As the improvement of such scheme, described communication module is GPRS wireless communication module.
As the improvement of such scheme, described adaptivity zero line break protection device also includes patch panel, and described component is fixed in patch panel.
As the improvement of such scheme, described patch panel is installed on the housing both sides of described chopper.
Correspondingly, the embodiment of the present invention additionally provides a kind of adaptivity neutral line break protection system, including distribution transformer, low-voltage distribution cabinet and adaptivity zero line break protection device；Described distribution transformer electrically connects with low-voltage distribution cabinet, and one end of described adaptivity zero line break protection device is connected with low-voltage distribution cabinet by transmission line of electricity, and the other end accesses user side.
Implement the present invention, have the advantages that
In adaptivity zero line break protection device of the present invention, concatenation power pack, the electric current I on Real-time Collection zero line between zero line lead-in wire terminal and zero line outlet terminal0；Each phase line lead-in wire terminal constitutes one group of terminal group with zero line lead-in wire terminal and accesses the input of a voltage changer, and each voltage changer gathers the load voltage between phase line lead-in wire terminal and zero line lead-in wire terminal accessed respectively；Correspondingly, the outfan of three voltage changers and power pack access data processing unit.During work, data processing unit passes through threephase load voltage and neutral line current, calculate self-adaptative adjustment coefficient, thus changing adaptive voltage, when there is the absolute value of difference of any biphase load voltage more than adaptive voltage, detection is neutral line break, chopper tripping is controlled now by switching value output circuit, realize playing good braking action when system properly functioning threephase load degree of asymmetry is bigger, adaptivity is strong, reliability when improve properly functioning, the chopper misoperation that can also effectively prevent threephase load degree of unbalancedness relatively big and to cause, improve the sensitivity of protection during disconnection fault.
Simultaneously; all components in adaptivity zero line break protection device of the present invention are installed on described chopper each through patch panel, and all electric parameters signals are taken from circuit breaker position, it is not necessary to additional equipment investment; save space, also allow for management, maintenance simultaneously.
It addition, the present invention carries out the transmission of signal by communication module so that fault message can inform staff in time, investigate fault rapid flexible more.
Accompanying drawing explanation
Fig. 1 is the example structure schematic diagram of adaptivity neutral line break of the present invention protection system；
Fig. 2 is the first embodiment structural representation of adaptivity zero line break protection device in Fig. 1；
Fig. 3 is the second example structure schematic diagram of adaptivity zero line break protection device in Fig. 1.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.Only this statement, the present invention occurs or the up, down, left, right, before and after that namely will appear from, the orientation word such as inside and outside in the text, and only with the accompanying drawing of the present invention for benchmark, it is not the concrete restriction to the present invention.
Show the embodiment of adaptivity neutral line break of the present invention protection system referring to Fig. 1, Fig. 1, be applied to 400V low power used system, for protecting the electrical equipment of user side 104 to be without prejudice.
Adaptivity neutral line break of the present invention protection system, including distribution transformer 100, low-voltage distribution cabinet 101 and adaptivity zero line break protection device 102.Distribution transformer 100 electrically connects with low-voltage distribution cabinet 101, and one end of adaptivity zero line break protection device 102 is connected with low-voltage distribution cabinet 101 by transmission line of electricity 103, and the other end accesses user side 104.
Off zero is accident common in 400V low power used system, can cause the burning of electrical equipment of user side 104.At present, the chopper that 400V low power used system adopts all detects function without neutral line break, and existing neutral line break protection philosophy may produce misoperation when threephase load degree of asymmetry is very big.The present invention passes through adaptivity zero line break protection device 102, it is possible to the disconnection fault of the zero line before detection chopper in time, it is ensured that electrical equipment is without prejudice.
Referring to Fig. 2; Fig. 2 shows the first embodiment of adaptivity zero line break protection device 102; including component, component includes three-phase phase line lead-in wire terminal 1, three-phase phase line outlet terminal 2, zero line lead-in wire terminal 3, zero line outlet terminal 4,5, three voltage changers (6A, 6B, 6C) of power pack, data processing unit 7, switching value output circuit 8 and chopper 9.
Wherein:
Concatenation power pack 5, the power pack 5 electric current I on Real-time Collection zero line between zero line lead-in wire terminal 3 and zero line outlet terminal 40, and the electric current I that will measure0Send into data processing unit 7.
It is connected by chopper 9 between three-phase phase line lead-in wire terminal 1 and three-phase phase line outlet terminal 2, each phase line lead-in wire terminal constitutes one group of terminal group with zero line lead-in wire terminal and accesses the input of a voltage changer, and each voltage changer gathers the load voltage U between phase line lead-in wire terminal and zero line lead-in wire terminal accessed respectivelyAN、UBN、UCN.A phase phase line lead-in wire terminal 1 corresponding phase phase line outlet terminal 2 in the present invention, simultaneously, three-phase phase line lead-in wire terminal 1 constitutes three groups of terminal group with zero line lead-in wire terminal 3 respectively, often group terminal group is independently accessed a voltage changer (6A, 6B, 6C), the load voltage between corresponding phase line lead-in wire terminal 1 and zero line lead-in wire terminal 3 measured by voltage changer (6A, 6B, 6C), and the load voltage measured is sent into data processing unit 7.Such as, voltage changer 6A is for measuring the load voltage U between the sub-1A of phase line lead-in wire terminal and zero line lead-in wire terminal 3AN, voltage changer 6B is for measuring the load voltage U between the sub-1B of phase line lead-in wire terminal and zero line lead-in wire terminal 3BN, voltage changer 6C is for measuring the load voltage U between the sub-1C of phase line lead-in wire terminal and zero line lead-in wire terminal 3CN。
The outfan of three voltage changers (6A, 6B, 6C) and power pack 5 access data processing unit 7, and data processing unit 7 is connected with chopper 9 by switching value output circuit 8.Therefore, by the threephase load voltage measured by three voltage changers (6A, 6B, 6C) and be all admitted to data processing unit 7 by the electric current measured described in power pack 5 and process, simultaneously, load voltage that data processing unit 7 gathers according to voltage changer (6A, 6B, 6C) and the electric current that power pack 5 gathers judge zero line situation, generate control signal, and control signal is exported to switching value output circuit 8 to control chopper 9.
Specifically, load voltage that data processing unit 7 gathers according to voltage changer (6A, 6B, 6C) and the electric current that power pack 5 gathers judge that the method for zero line situation is as follows: the load voltage that voltage changer (6A, 6B, 6C) gathers is pairwise grouping comparison, if the absolute value of the difference of any two load voltage is no more than adaptive voltage, then represent that zero line is normal, otherwise neutral line break.That is, simply by the presence of the absolute value of the difference of any two load voltage more than adaptive voltage, then it represents that neutral line break, now, data processing unit 7 generates control signal, and drives chopper 9 to trip by switching value output circuit 8.
Specifically, adaptive voltage is (k+p) Un, k is fixing constant coefficient, and p is self-adaptative adjustment coefficient, UnFor rated voltage.Correspondingly, the present invention fixes constant coefficient k and be preferably 0.15～0.2.Self-adaptative adjustment coefficientWherein, m=I0/max{UAN,UBN,UCN}。
It should be noted that self-adaptative adjustment coefficient p is used for reflecting neutral line current I0With the size of each phase load voltage magnitude, wherein, m value is more big, illustrates that threephase load degree of unbalancedness is more big.When system is properly functioning and threephase load degree of asymmetry is bigger, neutral line current I0Relatively big, self-adaptative adjustment coefficient p increases with degree of unbalancedness and increases, and plays good braking action；When there is neutral line break fault, self-adaptative adjustment coefficient p=0, thus neutral line break can effectively be identified.
Electric current I such as, in Fig. 2, on power pack 5 Real-time Collection zero line0, voltage changer 6A measures the load voltage U between the sub-1A of phase line lead-in wire terminal and zero line lead-in wire terminal 3 in real timeAN, voltage changer 6B measures the load voltage U between the sub-1B of phase line lead-in wire terminal and zero line lead-in wire terminal 3 in real timeBN, voltage changer 6C measures the load voltage U between the sub-1C of phase line lead-in wire terminal and zero line lead-in wire terminal 3 in real timeCN.Data processing unit 7 load voltage UAN、UBN、UCNIt is pairwise grouping, calculates the absolute value of the difference of two load voltages respectively | UAN-UBN|、|UBN-UCN| and | UCN-UAN|, if occurring | UAN-UBN|>(k+p)UnOr | UBN-UCN|>(k+p)UnOr | UCN-UAN|>(k+p)Un, then it represents that neutral line break, now, data processing unit 7 generates control signal, and drives chopper 9 tripping by switching value output circuit 8.
Therefore, the method that realizes of the neutral line break detection in the present invention has adaptivity, can pass through to measure threephase load voltage and neutral line current, calculate self-adaptative adjustment coefficient p, change adaptive voltage, when the modulus value difference of biphase load voltage is more than adaptive voltage, detection is neutral line break, chopper 9 tripping is controlled by switching value output circuit 8, thus realizing playing good braking action when system properly functioning threephase load degree of asymmetry is bigger, reliability when improve properly functioning, the chopper misoperation that can also effectively prevent threephase load degree of unbalancedness relatively big and to cause, improve the sensitivity of protection during disconnection fault.
Further, the adaptivity zero line break protection device of the present invention also includes patch panel 10, and component is fixed in patch panel 10.Meanwhile, patch panel 10 is installed on housing 11 both sides of chopper 9, it is not necessary to additional equipment investment, saves space, also allows for management, maintenance simultaneously.
Therefore, the present invention is directed to the neutral line break fault of 400V low power used system, judged by data processing unit 7, take trip protection mode, it is possible to the effective loss reduced owing to neutral line break causes, the safety of protection user's person and property.
Referring to Fig. 3; Fig. 3 shows the second embodiment of adaptivity zero line break protection device 102; with the first embodiment shown in Fig. 2 the difference is that, the present embodiment also includes for terminal send fault-signal communication module 12, communication module 12 is connected with switching value output circuit 8.
Preferably, communication module 12 is GPRS wireless communication module, is carried out the transmission of signal by GPRS wireless telecommunications so that fault message can inform staff in time, investigates fault rapid flexible more, but is not limited system.
Further, adaptivity zero line break protection device 102 of the present invention also includes neutral line break signal lamp 13, and neutral line break signal lamp 13 is located between switching value output circuit 8 and chopper 9.
When data processing unit 7 judges neutral line break fault, it is bright that data processing unit 7 controls neutral line break signal lamp 13 by switching value output circuit 8, and drive chopper 9 tripping, and send signal by communication module 9 to terminal, notify operations staff's abort situation.
From the foregoing, it will be observed that all components in the present invention are installed on described chopper 9 each through patch panel 10, it is not necessary to additional equipment investment, save space, also allow for management, maintenance.Simultaneously, it is achieved that detection function off zero, trip protection mode is taked, it is possible to the effective loss reduced owing to neutral line break operation causes, the safety of protection user's person and property.It addition, send signal by communication module 9 to terminal, notify operations staff's abort situation, improve the rapidity of malfunction elimination.
The above is the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (9)
1. an adaptivity zero line break protection device; it is characterized in that; including component, described component includes three-phase phase line lead-in wire terminal, three-phase phase line outlet terminal, zero line lead-in wire terminal, zero line outlet terminal, power pack, three voltage changers, data processing unit, switching value output circuit and chopper；
Concatenating described power pack between described zero line lead-in wire terminal and zero line outlet terminal, described power pack gathers the electric current I on zero line0；
It is connected by described chopper between described three-phase phase line lead-in wire terminal and three-phase phase line outlet terminal, each phase line lead-in wire terminal constitutes one group of terminal group with zero line lead-in wire terminal and accesses the input of a voltage changer, and each voltage changer gathers the load voltage U between phase line lead-in wire terminal and zero line lead-in wire terminal accessed respectivelyAN、UBN、UCN；
The outfan of described three voltage changers and power pack access data processing unit, described data processing unit is connected with chopper by switching value output circuit, and load voltage that described data processing unit gathers according to voltage changer and the electric current of power pack collection judge zero line situation and to switching value output circuit output control signal.
2. adaptivity zero line break protection device as claimed in claim 1, it is characterised in that according to the load voltage of voltage changer collection and the electric current of power pack collection, described data processing unit judges that the method for zero line situation includes:
Contrast described load voltage, if the absolute value of the difference of any two load voltage is no more than adaptive voltage, then it represents that zero line is normal, and otherwise neutral line break, wherein, described adaptive voltage is (k+p) Un, k is fixing constant coefficient, and p is self-adaptative adjustment coefficient, UnFor rated voltage.
3. adaptivity zero line break protection device as claimed in claim 2, it is characterised in that described self-adaptative adjustment coefficientWherein, m=I0/max{UAN,UBN,UCN}。
4. adaptivity zero line break protection device as claimed in claim 2, it is characterised in that described fixing constant coefficient k is 0.15～0.2.
5. adaptivity zero line break protection device as claimed in claim 1, it is characterised in that also including the communication module for sending fault-signal to terminal, described communication module is connected with switching value output circuit.
6. adaptivity zero line break protection device as claimed in claim 5, it is characterised in that described communication module is GPRS wireless communication module.
7. adaptivity zero line break protection device as claimed in claim 1, it is characterised in that also including patch panel, described component is fixed in patch panel.
8. adaptivity zero line break protection device as claimed in claim 1, it is characterised in that described patch panel is installed on the housing both sides of described chopper.
9. an adaptivity neutral line break protection system, it is characterised in that including:
Distribution transformer；
Low-voltage distribution cabinet；
Adaptivity zero line break protection device as described in any one of claim 1～8；
Described distribution transformer electrically connects with low-voltage distribution cabinet, and one end of described adaptivity zero line break protection device is connected with low-voltage distribution cabinet by transmission line of electricity, and the other end accesses user side.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106908649A (en) * | 2017-03-14 | 2017-06-30 | 南京保合太和电力科技有限公司 | Generator power pick-up device voltage sample system and 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710709A (en) * | 2009-11-27 | 2010-05-19 | 重庆市电力公司永川供电局 | Reactive power compensation integrated box of low-voltage distribution transformer |
| CN105024341A (en) * | 2015-08-17 | 2015-11-04 | 佛山电力设计院有限公司 | Circuit breaker and circuit break system having zero-line disconnection and open-phase protection function |
| CN105186490A (en) * | 2015-08-17 | 2015-12-23 | 佛山电力设计院有限公司 | Circuit breaker with zero line and phase line breaking detection function and circuit breaker system with zero line and phase line breaking detection function |
| CN204992575U (en) * | 2015-08-17 | 2016-01-20 | 广东电网有限责任公司佛山供电局 | Take zero line and phase line broken string to detect circuit breaker of function and open circuit system |
| CN204992527U (en) * | 2015-08-17 | 2016-01-20 | 广东电网有限责任公司佛山供电局 | Circuit breaker and system that opens circuit with disconnected zero -sum open -phase protection |
-
2016
- 2016-04-18 CN CN201610239799.9A patent/CN105811368B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710709A (en) * | 2009-11-27 | 2010-05-19 | 重庆市电力公司永川供电局 | Reactive power compensation integrated box of low-voltage distribution transformer |
| CN105024341A (en) * | 2015-08-17 | 2015-11-04 | 佛山电力设计院有限公司 | Circuit breaker and circuit break system having zero-line disconnection and open-phase protection function |
| CN105186490A (en) * | 2015-08-17 | 2015-12-23 | 佛山电力设计院有限公司 | Circuit breaker with zero line and phase line breaking detection function and circuit breaker system with zero line and phase line breaking detection function |
| CN204992575U (en) * | 2015-08-17 | 2016-01-20 | 广东电网有限责任公司佛山供电局 | Take zero line and phase line broken string to detect circuit breaker of function and open circuit system |
| CN204992527U (en) * | 2015-08-17 | 2016-01-20 | 广东电网有限责任公司佛山供电局 | Circuit breaker and system that opens circuit with disconnected zero -sum open -phase protection |
Non-Patent Citations (2)
| Title |
|---|
| 柳春芳等: "带零线电流判据的零线断线检测新方法", 《华北电力大学学报》 * |
| 陈雅芳等: "低压配电网缺相与断零故障判据研究", 《陕西电力》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106908649A (en) * | 2017-03-14 | 2017-06-30 | 南京保合太和电力科技有限公司 | Generator power pick-up device voltage sample system and 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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