CN207039184U - Automatic switchover earthing mode complexes - Google Patents
Automatic switchover earthing mode complexes Download PDFInfo
- Publication number
- CN207039184U CN207039184U CN201720680972.9U CN201720680972U CN207039184U CN 207039184 U CN207039184 U CN 207039184U CN 201720680972 U CN201720680972 U CN 201720680972U CN 207039184 U CN207039184 U CN 207039184U
- Authority
- CN
- China
- Prior art keywords
- arc
- automatic switchover
- earthing mode
- controller
- disconnecting switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Gas-Insulated Switchgears (AREA)
Abstract
It the utility model is related to a kind of automatic switchover earthing mode complexes.It solves the problems such as existing neutral node earthing mode is single.Including controller, parallel connection is connected to resistance-grounded system structure, gap ground structure, is directly grounded structure and grounding through arc structure controller respectively, resistance-grounded system structure includes the controllable small resistor being in series by small resistor and vacuum contactor, being directly grounded structure includes being used for the disconnecting switch for controlling neutral point of electric network to be directly grounded, and disconnecting switch is connected with motor-operating mechanism.Advantage is：Employ grounding through arc, a kind of earthing mode that low resistance grounding is unified with earth-free mode, select to use according to grid operating conditions for user, it is in parallel with arc suppression coil, disconnecting switch, gap primary side using small resistor, the division of the transferring the files of arc suppression coil, the switching of small resistor and disconnecting switch is controlled by controller to realize the selection of several earthing modes.
Description
Technical field
The utility model belongs to power supply unit technical field, more particularly, to a kind of automatic switchover earthing mode into suit
Put.
Background technology
Most of current Chinese 6kV~35kV power distribution networks use small current neutral grounding mode and isolated neutral mode, i.e.,
Neutral non-effective grounding mode and isolated neutral mode.With the quickening of urban construction paces, city framework is continuous
Widen, city medium voltage network scale also increases therewith, along with a large amount of uses of power cable line in recent years, medium voltage network system
The capacitance current level of system sharply increases, and this brings some problems to the operation of power network.Single-phase earthing causes medium voltage network
Failure and exception, there is multiple, shielding, popularity, Unpredictability and diversity, should give great attention,
Find out reason and work out measures and solve.The neutral grounding mode of middle voltage distribution networks mainly have it is several, using low resistance grounding,
It is grounding through arc, earth-free.The advantages of several earthing modes have itself and shortcoming, for example, grounding through arc is present
Adjust constant, intelligent low problem.
In order to solve the problems, such as that prior art is present, people have carried out long-term exploration, it is proposed that miscellaneous solution
Scheme.For example, Chinese patent literature discloses a kind of arc suppression coil device and its arc extinguishing method [application number：
201510732831.2], wherein arc suppression coil device includes arc suppression coil, one end ground connection of arc suppression coil, and the other end is opened with one
One end electrical connection of module is closed, the other end of switch module is output end；Also include simultaneously connecting resistance, and connect one end ground connection of electricity,
The other end with and connect input switch one end be connected, and connect input switch the other end be connected with output end.The utility model is thrown
Enter in use, the neutral point of output end and power network is connected together.When single-phase earthing occurs for power network, switch module is in power network electric capacity
During the increase of electric current, quickly arc suppression coil and neutral point are linked together, quickly go to weaken the asymmetrical voltage of power network.
After arc suppression coil access a period of time, when residual voltage is not zero in power network, and input switch closure is connect by simultaneously connecting resistance
Connected together with neutral point, go to eliminate residual voltage.
Such scheme solves the problems, such as that existing neutral grounding mode regulation is inconvenient to a certain extent, but the program
Still there is：Earthing mode is single, the problem of can not being selected according to grid operating conditions using a variety of earthing modes.
The content of the invention
The purpose of this utility model is in view of the above-mentioned problems, providing a kind of simple and reasonable, a variety of earthing mode combinations
Automatic switchover earthing mode complexes.
To reach above-mentioned purpose, the utility model employs following technical proposal：This automatic switchover earthing mode is into suit
Put, including controller, it is characterised in that described controller respectively parallel connection be connected to resistance-grounded system structure, gap ground structure,
Structure and grounding through arc structure are directly grounded, described resistance-grounded system structure is included by small resistor and vacuum contactor
The controllable small resistor being in series, it is described be directly grounded that structure includes being used for controlling neutral point of electric network to be directly grounded keep apart
Close, described disconnecting switch is connected with the motor-operating mechanism for the on/off switch for being connected with controller and being used to realize disconnecting switch.
In above-mentioned automatic switchover earthing mode complexes, described grounding through arc structure disappears including turn-adjusting
Arc coil, some taps are respectively equipped with described turn-adjusting arc-extinguishing winding, and each tap corresponds to the different numbers of turn,
And it is equipped with each tap and can realizes to have and carry switching gear so as to which change inductive current has load motor switch.
In above-mentioned automatic switchover earthing mode complexes, described small resistor is made up of stainless steel alloy, and institute
The small resistor stated is connected with controller.
In above-mentioned automatic switchover earthing mode complexes, described gap ground structure includes in parallel with controller
The discharging gap connect, at least one vacuum contactor, and described control are in series with the gap loop of described discharging gap
Device is connected with vacuum contactor, and described vacuum contactor is connected with arrester.
In above-mentioned automatic switchover earthing mode complexes, if being connected with turn on described turn-adjusting arc-extinguishing winding
Dry parallel resistance, and described parallel resistance is connected with silicon controlled component.
In above-mentioned automatic switchover earthing mode complexes, described turn-adjusting arc-extinguishing winding and voltage transformer phase
Even, described voltage transformer is connected by disconnecting switch with the once row of connection, and described once connection row and ground connection transformation
Device is connected.
In above-mentioned automatic switchover earthing mode complexes, described discharging gap passes through resistor and Current Mutual Inductance
Device is connected.
In above-mentioned automatic switchover earthing mode complexes, the number of the tap on described turn-adjusting arc-extinguishing winding
Measure as 5-25.
Compared with prior art, it is the advantages of this automatic switchover earthing mode complexes：It is simple in construction, employ
A kind of earthing mode that grounding through arc, low resistance grounding are unified with earth-free mode, for user according to grid operating conditions
Selection uses.It is in parallel with arc suppression coil, disconnecting switch, gap primary side using small resistor, arc suppression coil is controlled by controller
Transfer the files, the selection of several earthing modes is realized in the division of the switching of small resistor and disconnecting switch.
Brief description of the drawings
Fig. 1 is structural representation provided by the utility model.
Fig. 2 is the structural representation at another visual angle provided by the utility model.
Fig. 3 is theory diagram provided by the utility model.
In figure, controller 1, resistance-grounded system structure 2, small resistor 21, vacuum contactor 22, gap ground structure 3, electric discharge
Gap 31, arrester 32, it is directly grounded structure 4, disconnecting switch 41, motor-operating mechanism 42, grounding through arc structure 5, tune
Circle formula arc suppression coil 51, tap 52, have and carry motor switch 53, parallel resistance 6, silicon controlled component 7, voltage transformer 8, once
Connection row 81, resistor 9, current transformer 91.
Embodiment
The utility model is described in more detail with reference to the accompanying drawings and detailed description.
As Figure 1-3, this automatic switchover earthing mode complexes, including controller 1, controller 1 respectively and couple
There are resistance-grounded system structure 2, gap ground structure 3, be directly grounded structure 4 and grounding through arc structure 5, resistance-grounded system
Structure 2 includes the controllable small resistor being in series by small resistor 21 and vacuum contactor 22, and being directly grounded structure 4 includes being used to control
The disconnecting switch 41 that neutral point of electric network processed is directly grounded, disconnecting switch 41, which is connected with, to be connected with controller 1 and isolates for realizing
The motor-operating mechanism 42 of the on/off switch of switch 41, the design mainly employ grounding through arc, low resistance grounding with not connecing
A kind of earthing mode that ground mode is unified, select to use according to grid operating conditions for user.Using small resistor and arc suppression coil,
Disconnecting switch, gap primary side are in parallel, and the transferring the files of arc suppression coil, the switching of small resistor and disconnecting switch are controlled by controller
The selection of several earthing modes is realized in division.
Wherein, grounding through arc structure 5 here includes turn-adjusting arc-extinguishing winding 51, divides on turn-adjusting arc-extinguishing winding 51
Not She You some taps 52, and the corresponding different number of turn of each tap 52, and energy is equipped with each tap 52
Realizing has load switching gear carries motor switch 53 so as to change having for inductive current, and grounding through arc is exactly by systems
Property point access arc suppression coil, inductance current is provided when single-phase earthing occurs for system, compensating because system has electric capacity
In capacitive earth current caused by trouble point, the fault ground electric current of system is set to reach minimum.System single-phase earth fault may be used also
With operation 2 hours, so power supply reliability of the transformer neutral point through grounding through arc mode is higher, it is not easy to have a power failure.Also
Line selection device for low current can be configured, can tripping faulty line in a short time when singlephase earth fault occurs.
Wherein, resistance eutral grounding here is exactly to access resistor by property point in systems, when single-phase earthing occurs, failure
Circuit can produce a larger fault current, and configuration zero-sequencedirectional protection has good sensitivity, can rapidly cut off and connect
Ground circuit, but faulty grids must must be cut off in 10s, should not can burn-out resistance device.When single-phase fault occurs for single system, nothing
By being permanent or instantaneity, tripping operation is acted on, therefore line tripping number is more, has a strong impact on the normal power supply of user,
The reliability decrease for making it power, it is preferable that small resistor 21 here is made up of stainless steel alloy, and small resistor 21 and controller
1 is connected.
Preferably, gap ground structure 3 here includes and controller 1 and the discharging gap 31 that couples, discharging gap 31
Gap loop on be in series with least one vacuum contactor 22, and controller 1 is connected with vacuum contactor 22, vacuum contactor
22 are connected with arrester 32, are connected with some parallel resistances 6, and parallel resistance on turn-adjusting arc-extinguishing winding 51 here in turn
6 are connected with silicon controlled component 7, and turn-adjusting arc-extinguishing winding 51 is connected with voltage transformer 8, and voltage transformer 8 passes through disconnecting switch
41 are connected with the once row of connection 81, and once connection row 81 is connected with grounding transformer 82, and discharging gap 31 passes through resistor 9
Summation current transformer 91 is connected.
Further, grounding transformer here：For 10kV power distribution networks, because Transformer Winding is △, it is necessary to use ground connection
Transformer manufacturing neutral point.To reduce zero sequence impedance, grounding transformer uses Z-shaped wiring, should as needed can be with appropriate two
Secondary capacity is become with replacement station.Arc suppression coil is actually a kind of single-phase iron-core reactor, by the coil turn for changing winding
Number changes inductance, inductance value and the number of turn it is square directly proportional.Therefore, the quantity of the tap 52 on turn-adjusting arc-extinguishing winding 51
For 5-25, the corresponding different number of turn, motor switch is carried to adjust tap with having, can be achieved to carry switching gear, so as to change
Become inductive current.The size of loaded switch regulation arc suppression coil compensation capacitance current is driven by control flow output control signal.
In parallel gap, one vacuum contactor of circuit in series in gap, by controller come the switching of control contactor come between realizing
The use in gap loop.
This automatic switchover earthing method, including：A, arc suppression coil and small resistor unification earthing mode：When power distribution network connects
During earth fault, electric network capacitance and current value is detected into set of device by the way that grounding through arc structure 5 and resistance-grounded system structure are 2-in-1
To calculate the inductive current for needing to compensate, control arc suppression coil output compensation electric current；General instantaneity earth fault is by inductance
After current compensation, arc extinction, earth fault eliminates automatically, then complexes automatically exit from compensating coefficient, and system recovers normal
Operation, occur in low resistance grounding mode a faulty tripping operation at once so as to avoid and cause the high situation of line tripping rate.It is right
Line-to-ground fault is still had after arc suppression coil compensation 10s, then the system is believed that there occurs permanent earth fault,
Complexes can close vacuum contactor input small resistor automatically, and now fault current is larger, can be moved by zero-sequence current protection
Make, inlet wire is cut off by switch trip.After putting into small resistor, control Controllable Arc-Suppression Coil System exits compensation, after faulty line excision, is
System recovers normal operation, and the automatic closed high switch of earthing device exits small resistor, and the input of resistance realizes accurately soon
Fast isolated fault, avoids failure propagation.Integrated treatment of this earthing device for one-phase earthing failure in electric distribution network
Mode, exported and compensated by Controllable Arc-Suppression Coil System for instantaneity line-to-ground fault so that ground arc can quickly extinguish, solution
The shortcomings that trip-out rate in low resistance grounding of having determined is high, is the significant improvement to current low resistance grounding mode.
B, with gap ground and it is directly grounded unification earthing mode：Gap ground structure 3 and it is directly grounded structure 4 and belongs to
Heavy current grounding system, by neutral-point solid ground, when singlephase earth fault occurs, earth short circuit current is very big, makes open circuit
Device tripping operation excision failure, when using gap ground and be directly grounded device, by controller output signal controlling switch switching.
Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement to described specific embodiment or using similar
Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.
Although more used herein controller 1, resistance-grounded system structure 2, small resistor 21, vacuum contactor 22,
Gap ground structure 3, discharging gap 31, arrester 32, it is directly grounded structure 4, disconnecting switch 41, motor-operating mechanism 42, extinguishing arc
Coil ground structure 5, turn-adjusting arc-extinguishing winding 51, tap 52, have carry motor switch 53, parallel resistance 6, silicon controlled component 7,
Voltage transformer 8, the once term such as connection row 81, resistor 9, current transformer 91, but be not precluded from using other terms
Possibility.It is used for the purpose of more easily describing and explaining essence of the present utility model using these terms；It is construed as
The additional limitation of any one is all disagreed with the utility model spirit.
Claims (8)
1. a kind of automatic switchover earthing mode complexes, including controller (1), it is characterised in that described controller (1) point
Parallel connection is not connected to resistance-grounded system structure (2), gap ground structure (3), is directly grounded structure (4) and grounding through arc knot
Structure (5), described resistance-grounded system structure (2) are controllable small including being in series by small resistor (21) and vacuum contactor (22)
Resistance, the described structure (4) that is directly grounded includes being used for the disconnecting switch (41) for controlling neutral point of electric network to be directly grounded, described
Disconnecting switch (41) is connected with the motor-operating mechanism for the on/off switch for being connected with controller (1) and being used to realize disconnecting switch (41)
(42)。
2. automatic switchover earthing mode complexes according to claim 1, it is characterised in that described arc suppression coil connects
Ground structure (5) includes turn-adjusting arc-extinguishing winding (51), and described turn-adjusting arc-extinguishing winding is respectively equipped with some taps on (51)
(52) being equipped with, and the corresponding different number of turn of each tap (52), and on each tap (52) can realize have load to cut
There is load motor switch (53) gearshift position so as to change inductive current.
3. automatic switchover earthing mode complexes according to claim 2, it is characterised in that described small resistor (21)
It is made up of stainless steel alloy, and described small resistor (21) is connected with controller (1).
4. the automatic switchover earthing mode complexes according to Claims 2 or 3, it is characterised in that described gap connects
Ground structure (3) include with controller (1) and the discharging gap (31) that couples, go here and there on the gap loop of described discharging gap (31)
At least one vacuum contactor (22) is associated with, and described controller (1) is connected with vacuum contactor (22), described vacuum connects
Tentaculum (22) is connected with arrester (32).
5. automatic switchover earthing mode complexes according to claim 2, it is characterised in that described turn-adjusting extinguishing arc
It is connected with some parallel resistances (6) on coil (51) in turn, and described parallel resistance (6) is connected with silicon controlled component (7).
6. automatic switchover earthing mode complexes according to claim 2, it is characterised in that described turn-adjusting extinguishing arc
Coil (51) is connected with voltage transformer (8), and described voltage transformer (8) passes through disconnecting switch (41) and the once row of connection
(81) it is connected, and described once connection row (81) is connected with grounding transformer (82).
7. automatic switchover earthing mode complexes according to claim 4, it is characterised in that described discharging gap
(31) it is connected by resistor (9) summation current transformer (91).
8. automatic switchover earthing mode complexes according to claim 2, it is characterised in that described turn-adjusting extinguishing arc
The quantity of tap (52) on coil (51) is 5-25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720680972.9U CN207039184U (en) | 2017-06-13 | 2017-06-13 | Automatic switchover earthing mode complexes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720680972.9U CN207039184U (en) | 2017-06-13 | 2017-06-13 | Automatic switchover earthing mode complexes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207039184U true CN207039184U (en) | 2018-02-23 |
Family
ID=61471268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720680972.9U Expired - Fee Related CN207039184U (en) | 2017-06-13 | 2017-06-13 | Automatic switchover earthing mode complexes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207039184U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107154619A (en) * | 2017-06-13 | 2017-09-12 | 浙江日新电气有限公司 | Automatic switchover earthing mode complexes and its automatic switchover earthing method |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
-
2017
- 2017-06-13 CN CN201720680972.9U patent/CN207039184U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107154619A (en) * | 2017-06-13 | 2017-09-12 | 浙江日新电气有限公司 | Automatic switchover earthing mode complexes and its automatic switchover earthing method |
| CN110535116A (en) * | 2019-09-10 | 2019-12-03 | 北京华电瑞通电力工程技术有限公司 | A kind of arc extinction cabinet and small current neutral grounding system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107154619A (en) | Automatic switchover earthing mode complexes and its automatic switchover earthing method | |
| CN102611123B (en) | Intelligent reactive compensation device based on single three-pole synchronous switch | |
| CN103337867A (en) | Low voltage load online phase modulation device and phase modulation method thereof | |
| CN102623984A (en) | System for grounding neutral point in power grid through controllable reactor and resistor in combined manner | |
| CN207039184U (en) | Automatic switchover earthing mode complexes | |
| CN106329509B (en) | The small current earthing wire-selecting of neutral point of electric network isolated neutral system protects system | |
| CN109782116A (en) | A kind of full compensation device of earth current and method | |
| CN104065056A (en) | Process control method of 10 kV power grid ground fault | |
| CN113156251B (en) | Ground fault simulation experiment table for non-effective grounding system | |
| CN104967036B (en) | Integrated intelligent combination transformer station | |
| CN2796210Y (en) | Zero frequency short circuit high resistance earthed transformer type arc extinguishing coil | |
| CN104009485A (en) | Capacitance reactive additional regulating method and device of power transformer | |
| CN201504101U (en) | Integral grounding transformator and arc extinction coil device | |
| CN201054500Y (en) | Direction ground arc-elimination and cable selection suite device | |
| CN109100611A (en) | A kind of system and method for phase-control type arc suppression coil measurement 35KV distribution network capacitance current test | |
| CN202535062U (en) | System for grounding combination of neutral point and resistor via controllable reactance in electric power grid | |
| CN205724924U (en) | Electric load balance self-checking device | |
| CN209184242U (en) | It is a kind of to dispatch controllable power network neutral point earthing or grounding means | |
| CN208062789U (en) | A kind of transformer neutral point earthing resistance cabinet complexes | |
| CN109245068A (en) | A kind of neutral grounding mode conversion equipment | |
| CN114301046A (en) | Distribution network ground fault arc extinction method and device based on electrodeless voltage regulation | |
| CN1136638C (en) | Total-state compensating arc-extinguishing coil automatic tuning device | |
| CN203826784U (en) | Low-voltage power distribution device | |
| CN208923822U (en) | A kind of neutral grounding mode conversion equipment | |
| CN211744020U (en) | Arc tube management intelligent line selection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180223 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |