CN105811368B - Adaptivity zero line break protection device and system - Google Patents
Adaptivity zero line break protection device and system Download PDFInfo
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- CN105811368B CN105811368B CN201610239799.9A CN201610239799A CN105811368B CN 105811368 B CN105811368 B CN 105811368B CN 201610239799 A CN201610239799 A CN 201610239799A CN 105811368 B CN105811368 B CN 105811368B
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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
-
- 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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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of adaptivity zero line break protection device, including three-phase phase line lead-in wire terminal, three-phase phase line outlet terminal, zero curve lead-in wire terminal, zero curve outlet terminal, power pack, three voltage changers, data processing unit, switching value output circuit and breaker；Power pack is concatenated between zero curve lead-in wire terminal and zero curve outlet terminal；It is connected between three-phase phase line lead-in wire terminal and three-phase phase line outlet terminal by breaker, each phase line lead-in wire terminal forms one group of terminal group with zero curve lead-in wire terminal and accesses the input terminal of a voltage changer；Output terminal and power pack the access data processing unit of three voltage changers, data processing unit are connected by switching value output circuit with breaker.The invention also discloses a kind of adaptivity neutral line break to protect system.Using the present invention, it can realize detection function off zero by measuring threephase load voltage and neutral line current, effectively reduce the loss caused by neutral line break is run.
Description
Technical field
The present invention relates to low voltage electrical apparatus technology field, more particularly to a kind of adaptivity zero line break protection device and one kind
Adaptivity neutral line break protects system.
Background technology
The low voltage equipment overwhelming majority uses three phase supply.During low-voltage distribution system neutral line break, user terminal neutral point
Voltage can shift, and cause large area to burn consumer electronics, and very big economic loss is brought to user, or even cause the person to touch
Electrification.Therefore, accurately detect the neutral line break of low-pressure system and take Reasonable Protection measure, property and people to protecting user
Body is of great significance safely.
At present, the breaker that low-pressure system uses is without neutral line break detection function, and the zero curve proposed at present breaks
Line protection philosophy may produce malfunction when threephase load degree of asymmetry is very big.
The content of the invention
The technical problems to be solved by the invention are, there is provided a kind of adaptivity zero curve simple in structure, accuracy is high
Broken wire protecting equipment and system are, it can be achieved that detection function off zero.
In order to solve the above technical problem, the present invention provides a kind of adaptivity zero line break protection device, including electricity
Circuit component, the circuit element include three-phase phase line lead-in wire terminal, three-phase phase line outlet terminal, zero curve lead-in wire terminal, zero curve and go out
Line terminals, power pack, three voltage changers, data processing unit, switching value output circuit and breaker；The zero curve
The power pack is concatenated between lead-in wire terminal and zero curve outlet terminal, the power pack gathers the electric current on zero curve
I0；It is connected between three-phase phase line lead-in wire terminal and three-phase phase line outlet terminal by the breaker, each phase line enters line
Terminal forms one group of terminal group with zero curve lead-in wire terminal and accesses the input terminal of a voltage changer, each voltage changer point
Load voltage U between phase line lead-in wire terminal and zero curve lead-in wire terminal that Cai Ji not accessedAN、UBN、UCN；Three voltage
Output terminal and power pack the access data processing unit of converter, the data processing unit pass through switching value output circuit
It is connected with breaker, the electricity for load voltage and the power pack collection that the data processing unit is gathered according to voltage changer
Stream judges zero curve situation and to switching value output circuit output control signal.
As the improvement of such scheme, load voltage and electric current that the data processing unit is gathered according to voltage changer
The electric current of converter collection judges that the method for zero curve situation includes：Contrast the load voltage, if any two load voltage it
The absolute value of difference is no more than adaptive voltage, then it represents that and zero curve is normal, otherwise neutral line break, wherein, the adaptive voltage
For (k+p) Un, k is fixed constant coefficient, and p is adaptive regulation coefficient, UnFor rated voltage.
As the improvement of such scheme, the adaptive regulation coefficientIts
In, m=I0/max{UAN,UBN,UCN}。
As the improvement of such scheme, the fixed constant coefficient k is 0.15~0.2.
As the improvement of such scheme, the adaptivity zero line break protection device is further included for sending event to terminal
Hinder the communication module of signal, the communication module is connected with switching value output circuit.
As the improvement of such scheme, the communication module is GPRS wireless communication modules.
As the improvement of such scheme, the adaptivity zero line break protection device further includes patch panel, the electricity
Circuit component is fixed in patch panel.
As the improvement of such scheme, the patch panel is installed on the housing both sides of the breaker.
Correspondingly, the embodiment of the present invention additionally provides a kind of adaptivity neutral line break protection system, including distribution transformer
Device, low-voltage distribution cabinet and adaptivity zero line break protection device；The distribution transformer is electrically connected with low-voltage distribution cabinet, described
One end of adaptivity zero line break protection device is connected by transmission line of electricity with low-voltage distribution cabinet, other end accessing user end.
Implement the present invention, have the advantages that：
In adaptivity zero line break protection device of the present invention, electricity is concatenated between zero curve lead-in wire terminal and zero curve outlet terminal
Current converter, gathers the electric current I on zero curve in real time0；Each phase line lead-in wire terminal forms one group of terminal group with zero curve lead-in wire terminal
And the input terminal of a voltage changer is accessed, each voltage changer gathers accessed phase line lead-in wire terminal and zero curve respectively
Load voltage between lead-in wire terminal；Correspondingly, the output terminal of three voltage changers and power pack access data processing
Unit.During work, data processing unit calculates adaptive regulation coefficient, so as to change by threephase load voltage and neutral line current
Become adaptive voltage, when being more than adaptive voltage there are the absolute value of the difference of any two-phase load voltage, be detected as zero curve and break
Line, at this time by switching value output circuit control breaker tripping, realize system normal operation threephase load degree of asymmetry compared with
Good braking action is played when big, adaptivity is strong, improves reliability during normal operation, moreover it is possible to effectively prevents three-phase from bearing
Breaker malfunction, improves the sensitivity protected during disconnection fault caused by load degree of unbalancedness is larger.
Meanwhile all circuit elements in adaptivity zero line break protection device of the present invention are installed by patch panel
In on the breaker, all electrical quantity signals are taken from circuit breaker position, without additional equipment investment, save space,
Also allow for managing, repair at the same time.
In addition, the present invention carries out the transmission of signal by communication module so that fault message can inform work in time
Personnel, investigation failure more rapid flexible.
Brief description of the drawings
Fig. 1 is the example structure schematic diagram of adaptivity neutral line break protection system of the present invention；
Fig. 2 is the first embodiment structure diagram of adaptivity zero line break protection device in Fig. 1；
Fig. 3 is the second embodiment structure diagram of adaptivity zero line break protection device in Fig. 1.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
It is described in detail on step ground.Only this is stated, appearance in the text of the invention or the side such as the up, down, left, right, before and after that will appear from, inside and outside
Position word, only on the basis of the attached drawing of the present invention, it is not that the specific of the present invention is limited.
Referring to Fig. 1, Fig. 1 shows the embodiment of adaptivity neutral line break protection system of the present invention, low applied to 400V
Electricity system is pressed, the electrical equipment for protecting user terminal 104 is without prejudice.
Adaptivity neutral line break of the present invention protects system, including distribution transformer 100, low-voltage distribution cabinet 101 and from
Adaptability zero line break protection device 102.Distribution transformer 100 is electrically connected with low-voltage distribution cabinet 101, adaptivity neutral line break
One end of protective device 102 is connected by transmission line of electricity 103 with low-voltage distribution cabinet 101, other end accessing user end 104.
Off zero be accident common in 400V low power used systems, and the electrical equipment of user terminal 104 can be caused to burn.Mesh
Before, the breaker that 400V low power used systems use is without neutral line break detection function, existing neutral line break protection philosophy
Malfunction may be produced when threephase load degree of asymmetry is very big.The present invention passes through adaptivity zero line break protection device
102, the disconnection fault of the zero curve before breaker can be detected in time, ensure 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 circuit elements
Part, circuit element include three-phase phase line lead-in wire terminal 1, three-phase phase line outlet terminal 2, zero curve lead-in wire terminal 3, zero curve outlet terminal
4th, 5, three voltage changers (6A, 6B, 6C) of power pack, data processing unit 7, switching value output circuit 8 and breaker
9。
Wherein：
Power pack 5 is concatenated between zero curve lead-in wire terminal 3 and zero curve outlet terminal 4, power pack 5 is used to adopt in real time
Collect the electric current I on zero curve0, and the electric current I that will be measured0It is sent into data processing unit 7.
It is connected between three-phase phase line lead-in wire terminal 1 and three-phase phase line outlet terminal 2 by breaker 9, each phase line enters line
Terminal forms one group of terminal group with zero curve lead-in wire terminal and accesses the input terminal of a voltage changer, each voltage changer point
Load voltage U between phase line lead-in wire terminal and zero curve lead-in wire terminal that Cai Ji not accessedAN、UBN、UCN.A phase in the present invention
Phase line lead-in wire terminal 1 correspond to a phase phase line outlet terminal 2, meanwhile, three-phase phase line lead-in wire terminal 1 respectively with zero curve lead-in wire terminal 3
Forming three groups of terminal groups, every group of terminal group is independently accessed a voltage changer (6A, 6B, 6C), voltage changer (6A, 6B,
The load voltage between corresponding phase line lead-in wire terminal 1 and zero curve lead-in wire terminal 3 6C) is measured, and the load voltage measured is sent
Enter data processing unit 7.For example, voltage changer 6A is used to measure bearing between the sub- 1A of phase line lead-in wire terminal and zero curve lead-in wire terminal 3
Carry voltage UAN, voltage changer 6B is for measuring the load voltage U between the sub- 1B of phase line lead-in wire terminal and zero curve lead-in wire terminal 3BN, electricity
Buckling parallel operation 6C is used to measure the load voltage U between the sub- 1C of phase line lead-in wire terminal and zero curve lead-in wire terminal 3CN。
The output terminal and power pack 5 of three voltage changers (6A, 6B, 6C) access data processing unit 7, at data
Reason unit 7 is connected by switching value output circuit 8 with breaker 9.Therefore, surveyed by three voltage changers (6A, 6B, 6C)
The threephase load voltage and the electric current by being measured described in power pack 5 of amount are admitted to data processing unit 7 and are handled,
Meanwhile the electricity that the load voltage that is gathered according to voltage changer (6A, 6B, 6C) of data processing unit 7 and power pack 5 gather
Stream judges zero curve situation, generates control signal, and control signal is exported to switching value output circuit 8 to control breaker 9.
Specifically, the load voltage and current transformation that data processing unit 7 is gathered according to voltage changer (6A, 6B, 6C)
The electric current that device 5 gathers judges that the method for zero curve situation is as follows：The load voltage of voltage changer (6A, 6B, 6C) collection is carried out
Packet compares two-by-two, if the absolute value of the difference of any two load voltage is no more than adaptive voltage, then it represents that and zero curve is normal,
Otherwise neutral line break.That is, it is more than adaptive voltage simply by the presence of the absolute value of the difference of any two load voltage, then it represents that zero curve
Broken string, at this time, data processing unit 7 generate control signal, and drive breaker 9 to trip by switching value output circuit 8.
Specifically, adaptive voltage is (k+p) Un, k is fixed constant coefficient, and p is adaptive regulation coefficient, UnTo be specified
Voltage.Correspondingly, it is preferably 0.15~0.2 to fix constant coefficient k in the present invention.Adaptive regulation coefficientWherein, m=I0/max{UAN,UBN,UCN}。
It should be noted that adaptive regulation coefficient p is used to reflect neutral line current I0It is big with each phase load voltage magnitude
It is small, wherein, m values are bigger, illustrate that threephase load degree of unbalancedness is bigger.When system normal operation and threephase load degree of asymmetry is larger
When, neutral line current I0Larger, adaptive regulation coefficient p increases and increases with degree of unbalancedness, plays good braking action；When going out
During existing neutral line break failure, adaptive regulation coefficient p=0, so as to effectively identify neutral line break.
For example, in Fig. 2, power pack 5 gathers the electric current I on zero curve in real time0, voltage changer 6A measures phase line in real time
Load voltage U between the sub- 1A of lead-in wire terminal and zero curve lead-in wire terminal 3AN, voltage changer 6B measure in real time the sub- 1B of phase line lead-in wire terminal and
Load voltage U between zero curve lead-in wire terminal 3BN, voltage changer 6C measures the sub- 1C of phase line lead-in wire terminal and zero curve lead-in wire terminal 3 in real time
Between load voltage UCN.7 load voltage U of data processing unitAN、UBN、UCNIt is pairwise grouping, calculates two load electricity respectively
The absolute value of the difference of pressure | 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, at this time, data processing unit 7 generate control signal, and by opening
Pass amount output circuit 8 drives 9 tripping of breaker.
Therefore, the implementation method of the neutral line break detection in the present invention has adaptivity, can be born by measuring three-phase
Voltage and neutral line current are carried, calculates adaptive regulation coefficient p, changes adaptive voltage, when the modulus value difference of two-phase load voltage is big
When adaptive voltage, neutral line break is detected as, 9 tripping of breaker is controlled by switching value output circuit 8, so as to fulfill being
System normal operation threephase load degree of asymmetry plays good braking action when larger, improves reliability during normal operation,
Also can effectively prevent threephase load degree of unbalancedness it is larger caused by breaker malfunction, improve the spirit protected during disconnection fault
Sensitivity.
Further, adaptivity zero line break protection device of the invention further includes patch panel 10, and circuit element is fixed
In in patch panel 10.Meanwhile patch panel 10 is installed on 11 both sides of housing of breaker 9, without additional equipment investment, section
Space has been saved, while also allowed for managing, repair.
Therefore, the present invention is directed to the neutral line break failure of 400V low power used systems, is sentenced by data processing unit 7
It is disconnected, trip protection mode is taken, can effectively be reduced due to loss caused by neutral line break, the protection user person and property
Safety.
Referring to Fig. 3, Fig. 3 shows the second embodiment of adaptivity zero line break protection device 102, shown in Fig. 2
Unlike first embodiment, the communication module 12 for sending fault-signal to terminal is further included in the present embodiment, communicates mould
Block 12 is connected with switching value output circuit 8.
Preferably, communication module 12 is GPRS wireless communication modules, and the transmission of signal is carried out by GPRS wireless telecommunications, is made
Staff can be informed in time by obtaining fault message, investigate failure more rapid flexible, but be not limited system.
Further, adaptivity zero line break protection device 102 of the present invention further includes neutral line break signal lamp 13, and zero
Line disconnection signal indicator light 13 is arranged between switching value output circuit 8 and breaker 9.
When data processing unit 7 judges neutral line break failure, data processing unit 7 passes through switching value output circuit 8
Control neutral line break signal lamp 13 bright, and drive 9 tripping of breaker, and signal is sent to terminal by communication module 9, lead to
Know operations staff's abort situation.
From the foregoing, it will be observed that all circuit elements in the present invention are installed on the breaker 9 by patch panel 10, nothing
The equipment investment that need to be added, saves space, also allows for managing, repairs.Meanwhile detection function off zero is realized, take tripping
Protected mode, can effectively reduce the safety of loss caused by being run due to neutral line break, the protection user person and property.Separately
Outside, signal is sent to terminal by communication module 9, notifies operations staff's abort situation, improve the rapidity of malfunction elimination.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (8)
1. a kind of adaptivity zero line break protection device, it is characterised in that including circuit element, the circuit element includes three
Phase phase line lead-in wire terminal, three-phase phase line outlet terminal, zero curve lead-in wire terminal, zero curve outlet terminal, power pack, three voltages
Converter, data processing unit, switching value output circuit and breaker；
The power pack, the power pack collection zero are concatenated between zero curve lead-in wire terminal and zero curve outlet terminal
Electric current I on line0；
It is connected between three-phase phase line lead-in wire terminal and three-phase phase line outlet terminal by the breaker, each phase line enters line
Terminal forms one group of terminal group with zero curve lead-in wire terminal and accesses the input terminal of a voltage changer, each voltage changer point
Load voltage U between phase line lead-in wire terminal and zero curve lead-in wire terminal that Cai Ji not accessedAN、UBN、UCN；
Output terminal and power pack the access data processing unit of three voltage changers, the data processing unit lead to
Cross switching value output circuit with breaker to be connected, the load voltage and electricity that the data processing unit is gathered according to voltage changer
The electric current of current converter collection judges zero curve situation and to switching value output circuit output control signal；
The electric current for load voltage and the power pack collection that the data processing unit is gathered according to voltage changer judges zero
The method of wire condition includes：The load voltage is contrasted, if the absolute value of the difference of any two load voltage is no more than adaptive
Answer voltage, then it represents that zero curve is normal, otherwise neutral line break, wherein, the adaptive voltage is (k+p) Un, k is fixed definite value system
Number, p are adaptive regulation coefficient, UnFor rated voltage.
2. adaptivity zero line break protection device as claimed in claim 1, it is characterised in that the adaptive regulation coefficientWherein, m=I0/max{UAN,UBN,UCN}。
3. adaptivity zero line break protection device as claimed in claim 1, it is characterised in that the fixed constant coefficient k
For 0.15~0.2.
4. adaptivity zero line break protection device as claimed in claim 1, it is characterised in that further include for being sent out to terminal
The communication module of fault-signal is sent, the communication module is connected with switching value output circuit.
5. adaptivity zero line break protection device as claimed in claim 4, it is characterised in that the communication module is GPRS
Wireless communication module.
6. adaptivity zero line break protection device as claimed in claim 1, it is characterised in that further include patch panel, institute
Circuit element is stated to be fixed in patch panel.
7. adaptivity zero line break protection device as claimed in claim 6, it is characterised in that the patch panel is installed on
The housing both sides of the breaker.
8. a kind of adaptivity neutral line break protects system, it is characterised in that including：
Distribution transformer；
Low-voltage distribution cabinet；
Such as claim 1~7 any one of them adaptivity zero line break protection device；
The distribution transformer is electrically connected with low-voltage distribution cabinet, and one end of the adaptivity zero line break protection device passes through defeated
Electric line is connected with low-voltage distribution cabinet, other end accessing user end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610239799.9A CN105811368B (en) | 2016-04-18 | 2016-04-18 | Adaptivity zero line break protection device and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610239799.9A CN105811368B (en) | 2016-04-18 | 2016-04-18 | Adaptivity zero line break protection device and system |
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| CN105811368A CN105811368A (en) | 2016-07-27 |
| CN105811368B true CN105811368B (en) | 2018-04-17 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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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