CN206533138U - A kind of device of limitation 10kV distribution system capacitive earth currents - Google Patents

A kind of device of limitation 10kV distribution system capacitive earth currents Download PDF

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Publication number
CN206533138U
CN206533138U CN201720231705.3U CN201720231705U CN206533138U CN 206533138 U CN206533138 U CN 206533138U CN 201720231705 U CN201720231705 U CN 201720231705U CN 206533138 U CN206533138 U CN 206533138U
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China
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inductance
bus
phases
limitation
current
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CN201720231705.3U
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吴梅
吴桂林
田斌斌
刘自强
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Hubei Sanning Chemical Co Ltd
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Hubei Sanning Chemical Co Ltd
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Abstract

A kind of device of limitation 10kV distribution system capacitive earth currents, including ground connection become and arc suppression coil, the first inductance and the series connection of the 4th inductance, the second inductance and the series connection of the 5th inductance, the 3rd inductance and the series connection of the 6th inductance;One end, one end of the 5th inductance, one end of the 6th inductance of 4th inductance are connected in same point, are then connected with the 7th inductance in arc suppression coil;One end of first inductance is connected in bus A phases, and one end of the second inductance is connected in bus B phases, and one end of the 3rd inductance is connected in bus C phases;Main transformer 10kV bus bar side of the utility model in 110kV transformer stations, ground connection is installed additional to become and arc suppression coil, using the capacitance current of Microcomputer Automatic Testing System, track capacitance current change compensation inductive current in time, make earth fault current limit in setting range, the time and line selection device for low current for compensating inductive current cooperate, and substantially increase security.

Description

A kind of device of limitation 10kV distribution system capacitive earth currents
Technical field
The utility model is related to technical field of electricity, especially a kind of dress of limitation 10kV distribution system capacitive earth currents Put.
Background technology
10kV distribution systems are isolated neutral system, and system configuration has fuse wire type arc extinction cabinet, when system generation is single-phase During arc grounding, arc grounding is converted to metallic ground, distribution system still normal power supply by arc extinction cabinet action, but is sent out with continuous Exhibition, the extensive application of 10kV equipment, cable outlet is on the increase, and the unbalanced earth fault capacitance current of system also constantly increases, 60-80A or so is reached, earth current is much larger than the maximum blowout current of fuse, and fuse wire type arc extinction cabinet can not meet needs, When occurring singlephase earth fault, the fuse of arc extinction cabinet will be fused, and not have the effect of extinguishing arc, and singlephase earth fault is easily sent out Transform into phase fault accident.
The content of the invention
The purpose of this utility model is to provide a kind of device of limitation 10kV distribution system capacitive earth currents, tracking electricity Capacitance current change compensates inductive current in time, safe, to solve the problems mentioned in the above background technology.
To achieve the above object, the utility model provides following technical scheme:One kind limitation kV distribution system direct-to-ground capacitance The device of electric current, including ground connection become and arc suppression coil, and the ground connection, which becomes, includes the first inductance, the second inductance, the 3rd inductance, the 4th Inductance, the 5th inductance and the 6th inductance, the first inductance and the series connection of the 4th inductance, the second inductance and the series connection of the 5th inductance, the 3rd electricity Sense and the series connection of the 6th inductance;One end, one end of the 5th inductance, one end of the 6th inductance of 4th inductance are connected in same point On, then connected with the 7th inductance in arc suppression coil;One end of first inductance is connected in bus A phases, the second inductance One end be connected in bus B phases, one end of the 3rd inductance is connected in bus C phases.
It is used as further program of the utility model:One end ground connection of 7th inductance.
It is used as further program of the utility model:The bus A phases, bus B phases, bus C phase composition main transformers 10kV are female Line.
It is used as further program of the utility model:First switch is provided between first inductance and bus A phases, the Second switch is provided between two inductance and bus B phases, the 3rd switch is provided between the 3rd inductance and bus C phases.
Compared with prior art, the utility model beneficial effect:The utility model one kind limitation 10kV distribution systems are over the ground The device of capacitance current, by the main transformer 10kV bus bar sides in 110kV transformer stations, installs ground connection additional and becomes and arc suppression coil, using micro- The capacitance current of machine automatic checkout system, tracking capacitance current change compensates inductive current in time, limits earth fault electric current System is in setting range, and the time and line selection device for low current for compensating inductive current cooperate, and can adjust as needed With setting tuning-off degree and residual flow, security is substantially increased.
Brief description of the drawings
Fig. 1 is overall structure connection diagram of the present utility model.
In figure:1- ground connection becomes;2- arc suppression coils;The inductance of 3- first;The inductance of 4- second;The inductance of 5- the 3rd;The inductance of 6- the 4th; The inductance of 7- the 5th;The inductance of 8- the 6th;The inductance of 9- the 7th;10- bus A phases;11- bus B phases;12- bus C phases;13- first is opened Close;14- second switches;15- the 3rd is switched.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment obtained, belongs to the scope of the utility model protection.
Referring to Fig. 1, in the utility model embodiment, a kind of device of limitation 10kV distribution system capacitive earth currents, Become 1 and arc suppression coil 2 including ground connection, ground connection, which becomes 1, includes the first inductance 3, the second inductance 4, the 3rd inductance 5, the 4th inductance 6, the Five inductance 7 and the 6th inductance 8, the first inductance 3 and the 4th inductance 6 are connected, and the second inductance 4 and the 5th inductance 7 are connected, the 3rd inductance 5 and the 6th inductance 8 connect;One end, one end of the 5th inductance 7, one end of the 6th inductance 8 of 4th inductance 6 are connected in same point, Then connected with the 7th inductance 9 in arc suppression coil 2;One end of first inductance 3 is connected in bus A phases 10, the second inductance 4 One end is connected in bus B phases 11, and one end of the 3rd inductance 5 is connected in bus C phases 12.
A kind of device of limitation 10kV distribution system capacitive earth currents of the utility model, one end ground connection of the 7th inductance 9; A kind of device of limitation 10kV distribution system capacitive earth currents of the utility model, bus A phases 10, bus B phases 11, bus C phases 12 composition main transformer 10kV buses;A kind of device of limitation 10kV distribution system capacitive earth currents of the utility model, the first inductance 3 First switch 13 is provided between bus A phases 10, second switch 14, the 3rd are provided between the second inductance 4 and bus B phases 11 The 3rd switch 15 is provided between inductance 5 and bus C phases 12.
In summary:A kind of device of limitation 10kV distribution system capacitive earth currents of the utility model, it is single based on limitation Phase earthing capacitance current, it is ensured that power grid security, reliable principle, in the main transformer 10kV bus bar sides of 110kV transformer stations, installs ground connection additional Become 1 and arc suppression coil 2, using the capacitance current of Microcomputer Automatic Testing System, the change of tracking capacitance current compensates inductance electricity in time Stream, makes earth fault current limit in setting range, compensates time and the line selection device for low current phase interworking of inductive current Close, and can adjust and set as needed tuning-off degree and residual flow;The neutral point namely artificially manufactured, connects for connecting Ground resistance, when earth fault occurs in system, is in high impedance to positive sequence negative-sequence current, is in Low ESR to zero-sequence current, makes ground connection Protect action message;Being grounded the characteristics of becoming 1 maximum is:Only when breaking down, overload is only, when system is normally run When, all it is Light Condition;Ground connection becomes 1 in addition to can be with arc suppression coil 2, also can be with secondary load;When single-phase earthing event occurs for system During barrier, produce inductive current, compensation system capacitance current, inductive current and capacitance current it is in opposite direction, earth current is mended Repay into less numerical value or close to zero, to prevent electric arc from causing insulation breakdown to cause the accident, greatly improve security.

Claims (4)

1. a kind of device of limitation 10kV distribution system capacitive earth currents, including ground connection become(1)And arc suppression coil(2), it is special Levy and be:The ground connection becomes(1)Including the first inductance(3), the second inductance(4), the 3rd inductance(5), the 4th inductance(6), the 5th Inductance(7)With the 6th inductance(8), the first inductance(3)With the 4th inductance(6)Series connection, the second inductance(4)With the 5th inductance(7)String Connection, the 3rd inductance(5)With the 6th inductance(8)Series connection;4th inductance(6)One end, the 5th inductance(7)One end, the 6th Inductance(8)One end be connected in same point, then with arc suppression coil(2)In the 7th inductance(9)Series connection;First inductance (3)One end be connected to bus A phases(10)On, the second inductance(4)One end be connected to bus B phases(11)On, the 3rd inductance(5) One end be connected to bus C phases(12)On.
2. a kind of device of limitation 10kV distribution system capacitive earth currents according to claim 1, it is characterised in that:Institute State the 7th inductance(9)One end ground connection.
3. a kind of device of limitation 10kV distribution system capacitive earth currents according to claim 1 or 2, its feature exists In:The bus A phases(10), bus B phases(11), bus C phases(12)Constitute main transformer 10KV buses.
4. a kind of device of limitation 10kV distribution system capacitive earth currents according to claim 1 or 2, its feature exists In:First inductance(3)With bus A phases(10)Between be provided with first switch(13), the second inductance(4)With bus B phases (11)Between be provided with second switch(14), the 3rd inductance(5)With bus C phases(12)Between be provided with the 3rd switch(15).
CN201720231705.3U 2017-03-10 2017-03-10 A kind of device of limitation 10kV distribution system capacitive earth currents Active CN206533138U (en)

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CN201720231705.3U CN206533138U (en) 2017-03-10 2017-03-10 A kind of device of limitation 10kV distribution system capacitive earth currents

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Application Number Priority Date Filing Date Title
CN201720231705.3U CN206533138U (en) 2017-03-10 2017-03-10 A kind of device of limitation 10kV distribution system capacitive earth currents

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110412418A (en) * 2019-07-22 2019-11-05 国网湖北省电力有限公司电力科学研究院 Insulating tube type busbar insulation diagnosis and localization method based on earth current measurement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110412418A (en) * 2019-07-22 2019-11-05 国网湖北省电力有限公司电力科学研究院 Insulating tube type busbar insulation diagnosis and localization method based on earth current measurement

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