CN208386124U - A kind of neutral point drifting protective device - Google Patents
A kind of neutral point drifting protective device Download PDFInfo
- 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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- CN
- China
- Prior art keywords
- neutral point
- protective device
- cabinet
- pile crown
- voltage
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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
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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
- 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
Abstract
The utility model relates to electric network protection device more particularly to a kind of neutral point drifting protective devices, belong to electrical network field.A kind of neutral point drifting protective device provided by the utility model, it is intended to solve the technical problem of neutral point drifting protective device stability difference in the prior art.A kind of neutral point drifting protective device provided by the utility model, when three under-voltage/over-voltage protection devices compensate for TT power supply system neutral line break or poor contact, defect that neutral point can shift.When voltage is more than that specified value forces total security tripping to be 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 user power utilization equipment of supply voltage.Improve the stability of operation of power networks process.
Description
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. a kind of neutral point drifting protective device, it is characterised in that: including three-phase circuit (1), zero curve (2), the first breaker
(3), the second breaker (4), three branch circuit breakers (5), three under-voltage/over-voltage protection devices (6), three A.C. contactors (7), three
A grounding resistor (8), grounding rod, alarm (9) and loudspeaker (10), the second breaker (4) concatenation to three-phase circuit (1)
Middle control three-phase circuit (1) on-off, three-phase circuit (1) are respectively connected to three deficient over-voltages after the second breaker (4) and protect
Protect the upper pile crown of the upper pile crown of device (6), the normally-closed contact (11) of three A.C. contactors (7), three under-voltage/over-voltage protection devices (6)
Lower pile crown point is connected to one end of the coil of three A.C. contactors (7), and the other end of the coil of three A.C. contactors (7) connects
It is connected to the lower pile crown of first breaker (3), the zero curve (2) is connected to the upper pile crown of first breaker (3), and three
The lower pile crown of A.C. contactor (7) normally-closed contact (11) is respectively connected to the upper pile crown of three branch circuit breakers (5), three branches
The lower pile crown of breaker (5) is respectively connected to the upper pile crown of three grounding resistors (8), the lower stake of three grounding resistors (8)
Grounded stick ground connection is connected to alarm (9), the alarm after normally opened contact (12) series connection of three A.C. contactors (7)
Device (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) equal set.
2. a kind of neutral point drifting protective device according to claim 1, it is characterised in that: collection in the alarm (9)
At there is SIM communicator, the SIM communicator is communicated with the smart machine held by technical staff.
3. a kind of neutral point drifting protective device according to claim 2, it is characterised in that: the intelligence held by technical staff
Energy equipment is smart phone or tablet computer.
4. a kind of neutral point drifting protective device according to claim 1, it is characterised in that: neutral point drifting protection dress
Setting further includes the cabinet (13) with accommodating chamber and the chamber door (14) for being closed the accommodating chamber, and the chamber door (14) passes through hinge and turns
It is dynamic to be connected on the cabinet (13), it is provided on the chamber door (14) and the chamber door (14) is locked together in the cabinet (13)
On lockset (15).
5. a kind of neutral point drifting protective device according to claim 4, it is characterised in that: be fixed in the accommodating chamber
The insulation board (16) of electrical component is installed, the insulation board (16) is fixed by screws on the side wall of the accommodating chamber.
6. a kind of neutral point drifting protective device according to claim 5, it is characterised in that: on the insulation board (16)
It is provided with the mounting bracket (17) of installation electrical component, the mounting bracket (17) is fixed by screws in the insulation board (16)
On.
7. a kind of neutral point drifting protective device according to claim 4 or 5 or 6, it is characterised in that: in the cabinet
(13) it is provided between the chamber door (14) waterproof washer (18), the waterproof washer (18) is bonded in the cabinet (13)
On.
8. a kind of neutral point drifting protective device according to claim 4, it is characterised in that: on the cabinet (13) also
It is fixed with waterproof cover (19), the shape of the waterproof cover (19) is in ridge-shaped, and the lower end of the waterproof cover (19) is extended described
(13) 30 millimeters to 80 millimeters of cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821073152.4U CN208386124U (en) | 2018-07-05 | 2018-07-05 | A kind of neutral point drifting protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821073152.4U CN208386124U (en) | 2018-07-05 | 2018-07-05 | A kind of neutral point drifting protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208386124U true CN208386124U (en) | 2019-01-15 |
Family
ID=64962395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821073152.4U Active CN208386124U (en) | 2018-07-05 | 2018-07-05 | A kind of neutral point drifting protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208386124U (en) |
Cited By (1)
| 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 |
-
2018
- 2018-07-05 CN CN201821073152.4U patent/CN208386124U/en active Active
Cited By (1)
| 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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