CN208386124U - A neutral point drift protection device - Google Patents

A neutral point drift protection device Download PDF

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Publication number
CN208386124U
CN208386124U CN201821073152.4U CN201821073152U CN208386124U CN 208386124 U CN208386124 U CN 208386124U CN 201821073152 U CN201821073152 U CN 201821073152U CN 208386124 U CN208386124 U CN 208386124U
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China
Prior art keywords
neutral point
protection device
point drift
drift protection
contactors
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CN201821073152.4U
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Chinese (zh)
Inventor
滕志豪
向魁
张孟涛
蔡文宇
乐雪清
邱南帆
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Wenzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Wenzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Priority to CN201821073152.4U priority Critical patent/CN208386124U/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems

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  • Emergency Protection Circuit Devices (AREA)

Abstract

本实用新型涉及电网保护装置，尤其涉及一种中性点漂移保护装置，属于电网领域。本实用新型提供的一种中性点漂移保护装置，旨在解决现有技术中的中性点漂移保护装置稳定性差的技术问题。本实用新型提供的一种中性点漂移保护装置，三个欠过压保护器弥补了TT供电系统零线断线或者接触不良的时候，中性点会发生偏移的缺陷。当电压超过规定值迫使总保跳闸切断电源。该方案能降低用户电压超范围引起投诉，能避免供电电压过高或过低损坏用户用电设备。提高了电网运行过程的稳定性。

The utility model relates to a power grid protection device, in particular to a neutral point drift protection device, which belongs to the field of power grids. The utility model provides a neutral point drift protection device, which aims to solve the technical problem of poor stability of the neutral point drift protection device in the prior art. The utility model provides a neutral point drift protection device. The three under-overvoltage protectors make up for the defect that the neutral point will shift when the zero line of the TT power supply system is disconnected or in poor contact. When the voltage exceeds the specified value, the general protection trip is forced to cut off the power supply. This solution can reduce the complaints caused by the user's voltage exceeding the range, and can avoid damage to the user's electrical equipment due to the high or low power supply voltage. The stability of the power grid operation process is improved.

Description

A kind of neutral point drifting protective device
Technical field
The utility model relates to electric network protection device more particularly to a kind of neutral point drifting protective devices, belong to power grid neck Domain.
Background technique
After three-phase and four-line power supply system zero curve disconnects, due to the imbalance of threephase load, lead to neutral point drifting.Zero curve is disconnected After opening, former 220V electrical appliance only constitutes circuit by other phase lines without zero curve, and any two-phase phase voltage is 380V, thus It generates serious overvoltage and causes various failures.
At present there are three types of national grid electric power neutral grounding modes: isolated neutral system, neutral point pass through extinguishing arc Coil earthed system and solidly earthed neutral system.The power supply reliability of isolated neutral system is higher.In this system When middle generation single-phase earthing and line electrical leakage failure, earth-return circuit is not constituted, so low-voltage circuit does not use this ground connection system System.Solidly earthed neutral system is the electric system that neutral point is directly connect with ground wire (the earth), this system neutral Point is fixed as ground point, when one-phase circuit since insulation against ground damage damages, just forms single-phase short circuit circuit.At this time Under relay protection effect, faulty line is removed.
It is provided according to GB9082.2 and DL/T499-2001, low-voltage distribution Grounding Types are divided into TN-C, TT, IT these three types. Cities and towns electric system is generally required using TN-C system, and whole system is combined by neutral conductor N and protective wire PE, is called protection The neutral conductor.The protection neutral conductor is all made of repetition and is uniformly grounded, preferably in each household service conductor, draw the place of connecing ground connection.Distribution transformer low pressure Side should install short-circuit overload protection.Residual current operated protective device should be installed at user.
Rural area low-voltage distribution network is generally required using TT power supply system.The system is that mains neutral point is directly grounded, in system All electric device exposed conductive parts are connected on separate earth electrode, separate ground electrode with protective wire PE.Residual current operated protective device is installed in system And protector for circuit cut-off overload, ground connection or short circuit occur at power supply line or user can effective disengagement failure point.The system is removed With outside net side neutral-point solid ground, neutral point must not multiple grounding.And keep the equal insulation of phase line, that is, power supply line Insulation.Neutral point must not install fuse or independent switch.
It is applied to the neutral point drifting protective device unreasonable structure of low-voltage platform area in the prior art, causes neutral point drifting It protects stability poor, and then be easy to cause electric network fault.
Summary of the invention
A kind of neutral point drifting protective device provided by the utility model, it is intended to solve neutral point drifting in the prior art The technical problem of protective device stability difference.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution:
A kind of neutral point drifting protective device, including three-phase circuit, zero curve, the first breaker, the second breaker, three points Branch breaker, three under-voltage/over-voltage protection devices, three A.C. contactors, three grounding resistors, grounding rod, alarm and loudspeaker, Second breaker concatenates and controls the three-phase circuit on-off into three-phase circuit, and three-phase circuit is distinguished after the second breaker It is connected to the upper pile crown of the upper pile crown of three under-voltage/over-voltage protection devices, the normally-closed contact of three A.C. contactors, three deficient over-voltages are protected The lower pile crown point of shield device is connected to one end of the coil of three A.C. contactors, and the other end of the coil of three A.C. contactors connects It is connected to the lower pile crown of first breaker, the zero curve is connected to the upper pile crown of first breaker, three ac contactors The lower pile crown of device normally-closed contact is respectively connected to the upper pile crown of three branch circuit breakers, the lower pile crown difference of three branch circuit breakers It is connected to the upper pile crown of three grounding resistors, the grounded stick ground connection of the lower pile crown of three grounding resistors, three ac contactors Be connected to alarm after the normally opened contact series connection of device, the alarm is connect with the loudspeaker, three A.C. contactors it is normally opened Contact is closed the equal set of alarm device, loudspeaker.
A kind of neutral point drifting protective device provided by the utility model, three under-voltage/over-voltage protection devices compensate for TT power supply system It unites neutral line break or when poor contact, the defect that neutral point can shift.When voltage is more than that specified value forces total security Tripping is cut off the power.The program can reduce user's voltage over range and cause to complain, and be avoided that the too high or too low damage of supply voltage User power utilization equipment.Improve the stability of operation of power networks process.
A kind of optional scheme, is integrated with SIM communicator in the alarm, the SIM communicator with by technical staff The smart machine communication held.
Warning message is sent to specific technology personnel with can be convenient by the setting of SIM communicator, shortens power grid repairing Time.
A kind of optional scheme is smart phone or tablet computer by the smart machine that technical staff holds.
Smart phone or tablet computer have the function of more, optimize the performance of smart machine.
A kind of optional scheme, the neutral point drifting protective device further include the cabinet and the closure appearance with accommodating chamber Receive the chamber door of chamber, the chamber door is rotatably connected on the cabinet by hinge, is provided on the chamber door by the chamber door The lockset being locked together on the cabinet.
Cabinet primarily serves water-proof function, can prevent liquid entry into cabinet and electrical component is caused to damage, and improves The stability of property point drift protective device.
A kind of optional scheme, the insulation board of installation electrical component is fixed in the accommodating chamber, and the insulation board passes through Screw is fixed on the side wall of the accommodating chamber.
The installation of insulation board being provided with conducive to electronic component, also, insulation board is isolated by electronic component with cabinet, is avoided Cabinet electrification, optimizes the performance of neutral point drifting protective device.
A kind of optional scheme is provided with the mounting bracket of installation electrical component, the installation branch on the insulation board Frame is fixed by screws on the insulation board.
The setting of mounting bracket optimizes neutral point drifting protective device so that electrical component is easy for installation and fixation Performance.
A kind of optional scheme, is provided with waterproof washer between the cabinet and the chamber door, and the waterproof washer is viscous It connects on the cabinet.
The setting of water proof ring improves the sealing performance of cabinet, efficiently avoids liquid and enters in cabinet.
A kind of optional scheme, is further fixed on waterproof cover on the cabinet, and the shape of the waterproof cover is in ridge-shaped, institute Extend 30 millimeters to 80 millimeters of the cabinet in the lower end for stating waterproof cover.
The setting of waterproof cover can be effectively prevented rainwater and enter in cabinet, optimize the performance of cabinet.
Compared with prior art, a kind of neutral point drifting protective device provided by the utility model, has the advantages that
1, when the setting of three under-voltage/over-voltage protection devices compensates for TT power supply system neutral line break or poor contact, in The defect that property point can shift.
2, when voltage forces total security tripping to be cut off the power more than regulation duration and it is on duty to power supply station to issue alarm signal Room improves power grid first-aid repair efficiency.
3, the program can effectively improve the power supply quality of power grid, reduce and complain caused by user's voltage over range, energy Avoid the too high or too low damage user power utilization equipment of supply voltage.Reduce the operating cost of power grid.
4, the setting of alarm can know that at the first time voltage over range failure, section occur for which platform area and which range Power grid emergency repair time is saved.
5, operation of power networks is avoided to cause accident due to quality of voltage.
Detailed description of the invention
Attached drawing 1 is the circuit diagram of the utility model.
Attached drawing 2 is the schematic diagram of cabinet in the utility model.
Specific embodiment
With reference to the accompanying drawing, a kind of neutral point drifting protective device of the utility model is described further.Following reality It applies example to be only used for helping skilled in the art to understand the utility model, is not limitations of the present invention.
Embodiment one
Such as Fig. 1, a kind of neutral point drifting protective device, including three-phase circuit 1, zero curve 2, first the 3, second open circuit of breaker Device 4, three A.C. contactors of under-voltage/over-voltage protection device 6, three of branch circuit breaker 5, three, 7, three grounding resistors 8, grounding rod, Alarm 9 and loudspeaker 10, the concatenation of the second breaker 4 control 1 on-off of three-phase circuit, three-phase electricity into three-phase circuit 1 Road 1 is respectively connected to the normally closed touching of the upper pile crown of three under-voltage/over-voltage protection devices 6, three A.C. contactors 7 after the second breaker 4 The upper pile crown of point 11, the lower pile crown of three under-voltage/over-voltage protection devices 6 point are connected to one end of the coil of three A.C. contactors 7, and three The other end of the coil of a A.C. contactor 7 is connected to the lower pile crown of first breaker 3, and the zero curve 2 is connected to described The lower pile crown of the upper pile crown of first breaker 3, three 7 normally-closed contacts 11 of A.C. contactor is respectively connected to three branch circuit breakers 5 upper pile crown, the lower pile crown of three branch circuit breakers 5 are respectively connected to the upper pile crown of three grounding resistors 8, three ground connection electricity The grounded stick ground connection of lower pile crown of device 8 is hindered, the normally opened contact 12 of three A.C. contactors 7 is connected to alarm 9 after connecting, described Alarm 9 is connect with the loudspeaker 10, and the normally opened contact 12 of three A.C. contactors 7 is closed alarm device 9, loudspeaker 10 are set Position.
Above-mentioned electrical component is connected by conducting wire to be formed into a loop.
SIM communicator, the SIM communicator and the smart machine held by technical staff are integrated in the alarm 9 Communication.
It is smart phone or tablet computer by the smart machine that technical staff holds.
Embodiment two
Such as Fig. 2, which further includes the cabinet 13 and the closure accommodating chamber with accommodating chamber Chamber door 14, the chamber door 14 are rotatably connected on the cabinet 13 by hinge, are provided on the chamber door 14 by the case Door 14 is locked together in the lockset 15 on the cabinet 13.Hinge can be riveted on cabinet 13 and chamber door 14, and lockset 15 is existing skill Conventional structure in art, the not reinflated narration of specific structure.The key of lockset 15 should be held by professional, to avoid unrelated Personnel open 14 maloperation of chamber door.
Waterproof washer 18 is provided between the cabinet 13 and the chamber door 14, the waterproof washer 18 is bonded in described On cabinet 13, waterproof washer 18 primarily serves water-proof function, enters in cabinet 13 to avoid liquid.It is also solid on the cabinet 13 Surely there is waterproof cover 19, the shape of the waterproof cover 19 is in ridge-shaped, and the cabinet 1330 is extended in the lower end of the waterproof cover 19 Millimeter is to 80 millimeters.Waterproof cover 19 can be welded on the cabinet 13.
The insulation board 16 of installation electrical component is fixed in the accommodating chamber, the insulation board 16 is fixed by screws in institute It states on the side wall of accommodating chamber.The mounting bracket 17 of installation electrical component, the mounting bracket are provided on the insulation board 16 17 are fixed by screws on the insulation board 16.
It is described in detail above in conjunction with section Example of the attached drawing to the utility model.Those skilled in the art read After this specification, it is based on the technical solution of the utility model, can be modified to above-described embodiment, these modifications still fall within this The protection scope of utility model.

Claims (8)

1.一种中性点漂移保护装置，其特征在于：包括三相电路(1)、零线(2)、第一断路器(3)、第二断路器(4)，三个分支断路器(5)、三个欠过压保护器(6)、三个交流接触器(7)、三个接地电阻器(8)、接地棒、报警器(9)和喇叭(10)，所述第二断路器(4)串接至三相电路(1)中控制所述三相电路(1)通断，三相电路(1)经第二断路器(4)后分别连接至三个欠过压保护器(6)的上桩头、三个交流接触器(7)的常闭触点(11)的上桩头，三个欠过压保护器(6)的下桩头分连接至三个交流接触器(7)的线圈的一端，三个交流接触器(7)的线圈的另一端连接至所述第一断路器(3)的下桩头，所述零线(2)连接至所述第一断路器(3)的上桩头，三个交流接触器(7)常闭触点(11)的下桩头分别连接至三个分支断路器(5)的上桩头，三个分支断路器(5)的下桩头分别连接至三个接地电阻器(8)的上桩头，三个接地电阻器(8)的下桩头经接地棒接地，三个交流接触器(7)的常开触点(12)串联后连接至报警器(9)，所述报警器(9)与所述喇叭(10)连接，三个交流接触器(7)的常开触点(12)均闭合时报警器(9)、喇叭(10)均置位。1. A neutral point drift protection device, characterized in that it comprises a three-phase circuit (1), a neutral line (2), a first circuit breaker (3), a second circuit breaker (4), and three branch circuit breakers. (5), three under-overvoltage protectors (6), three AC contactors (7), three grounding resistors (8), grounding rods, an alarm (9) and a horn (10), the third Two circuit breakers (4) are connected in series to the three-phase circuit (1) to control the on-off of the three-phase circuit (1). The upper pile heads of the voltage protector (6), the upper pile heads of the normally closed contacts (11) of the three AC contactors (7), and the lower pile heads of the three under-overvoltage protectors (6) are respectively connected to the three terminals. One end of the coils of the three AC contactors (7), the other ends of the coils of the three AC contactors (7) are connected to the lower pile head of the first circuit breaker (3), and the neutral line (2) is connected to The upper pile heads of the first circuit breaker (3), the lower pile heads of the normally closed contacts (11) of the three AC contactors (7) are respectively connected to the upper pile heads of the three branch circuit breakers (5), and the three The lower pile heads of the branch circuit breakers (5) are respectively connected to the upper pile heads of the three grounding resistors (8), the lower pile heads of the three grounding resistors (8) are grounded through the ground rod, and the three AC contactors ( 7) The normally open contacts (12) are connected in series to the alarm (9), the alarm (9) is connected to the horn (10), and the normally open contacts ( 12) When both are closed, the alarm (9) and the horn (10) are both set. 2.根据权利要求1所述的一种中性点漂移保护装置，其特征在于：所述报警器(9)内集成有SIM通讯器，所述SIM通讯器与由技术人员持有的智能设备通讯。2. a kind of neutral point drift protection device according to claim 1, is characterized in that: described alarm device (9) is integrated with SIM communicator, described SIM communicator and the intelligent equipment held by technician communication. 3.根据权利要求2所述的一种中性点漂移保护装置，其特征在于：由技术人员持有的智能设备为智能手机或平板电脑。3 . The neutral point drift protection device according to claim 2 , wherein the smart device held by the technician is a smart phone or a tablet computer. 4 . 4.根据权利要求1所述的一种中性点漂移保护装置，其特征在于：该中性点漂移保护装置还包括具有容纳腔的箱体(13)和闭合所述容纳腔的箱门(14)，所述箱门(14)通过合页转动连接在所述箱体(13)上，在所述箱门(14)上设置有将所述箱门(14)锁合在所述箱体(13)上的锁具(15)。4. A neutral point drift protection device according to claim 1, characterized in that: the neutral point drift protection device further comprises a box body (13) having an accommodating cavity and a box door (13) closing the accommodating cavity. 14), the box door (14) is rotatably connected to the box body (13) through a hinge, and the box door (14) is provided with a device to lock the box door (14) to the box. The lock (15) on the body (13). 5.根据权利要求4所述的一种中性点漂移保护装置，其特征在于：所述容纳腔内固定有安装电气元件的绝缘板(16)，所述绝缘板(16)通过螺钉固定在所述容纳腔的侧壁上。5 . The neutral point drift protection device according to claim 4 , wherein an insulating plate ( 16 ) for mounting electrical components is fixed in the accommodating cavity, and the insulating plate ( 16 ) is fixed on the on the side wall of the accommodating cavity. 6.根据权利要求5所述的一种中性点漂移保护装置，其特征在于：在所述绝缘板(16)上设置有安装电气元件的安装支架(17)，所述安装支架(17)通过螺钉固定在所述绝缘板(16)上。6. A neutral point drift protection device according to claim 5, characterized in that: a mounting bracket (17) for mounting electrical components is provided on the insulating plate (16), and the mounting bracket (17) It is fixed on the insulating plate (16) by screws. 7.根据权利要求4或5或6所述的一种中性点漂移保护装置，其特征在于：在所述箱体(13)与所述箱门(14)之间设置有防水垫圈(18)，所述防水垫圈(18)粘接在所述箱体(13)上。7. A neutral point drift protection device according to claim 4, 5 or 6, characterized in that: a waterproof gasket (18) is provided between the box body (13) and the box door (14). ), the waterproof gasket (18) is bonded on the box body (13). 8.根据权利要求4所述的一种中性点漂移保护装置，其特征在于：在所述箱体(13)上还固定有防水罩(19)，所述防水罩(19)的形状呈屋脊形，所述防水罩(19)的下端延伸出所述箱体(13)30毫米至80毫米。8. A neutral point drift protection device according to claim 4, characterized in that: a waterproof cover (19) is also fixed on the box body (13), and the waterproof cover (19) has a shape of In the shape of a ridge, the lower end of the waterproof cover (19) extends out of the box body (13) by 30 mm to 80 mm.
CN201821073152.4U 2018-07-05 2018-07-05 A neutral point drift protection device Active CN208386124U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109038480A (en) * 2018-07-05 2018-12-18 国网浙江省电力有限公司温州市洞头区供电公司 A kind of neutral point drifting protective device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109038480A (en) * 2018-07-05 2018-12-18 国网浙江省电力有限公司温州市洞头区供电公司 A kind of neutral point drifting protective device

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