CN1767294A - Earthing compensation process for mine low-voltage electricity grid selective leakage protection system - Google Patents
Earthing compensation process for mine low-voltage electricity grid selective leakage protection system Download PDFInfo
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- CN1767294A CN1767294A CN 200510044820 CN200510044820A CN1767294A CN 1767294 A CN1767294 A CN 1767294A CN 200510044820 CN200510044820 CN 200510044820 CN 200510044820 A CN200510044820 A CN 200510044820A CN 1767294 A CN1767294 A CN 1767294A
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- leakage protection
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Abstract
The invention relates to an earth compensation method of a mine low temperature electrified wire netting leakage protecting system, which is characterized in that each adjacent branch switch of the mine low temperature electrified wire netting leakage protecting system fixes a choosing leakage protector, a zero-sequence reactance LK and a three-phase reactance SK, wherein it uses each branch zero-sequence reactance LK to generate electric inductance current IL to compensate the local wire earth capacity current Ic. It adopts the out branch scattering compensation mode to displace the traditional power bus concentrating compensation mode.
Description
One, technical field:
The invention belongs to selecting property of mine low-voltage electricity grid selective leakage protection system.
Two, technical background:
The China's coal-mine underground low-tension network is generally isolated neutral system.When this system's generation single-phase earthing leaks electricity, can produce tens of extremely capacitive character arc currents of hundreds of milliamperes, cause the personal electric shock injures and deaths or the gas explosion of igniting at earth point.For this reason, the neutral point by three-phase reactor SK in this system meets a zero-sequence reactor LK again through capacitor C ground connection, just can produce inductive current I
LIn order to compensation network capacitive earth current I
CThereby, the deduction and exemption unsafe factor.
But; it all is to adopt zero sequence power direction principle or phase-sensitive protection principle that protective device (putting etc. as the neglected loading of selecting of using in wider KXL-1, BJJ type and the various comprehensive protector) is leaked in the existing low pressure choosing of China; thereby can only be applicable to that all down-hole low pressure do not have the electrical network of zero-sequence reactor compensate function; otherwise can enter " dead band " because of the ground connection overcompensation may appear in system, lose choosing and leak protective effect.Therefore; in order to guarantee to select " the laterally selectivity " of Lou protection; existing down-hole low pressure selective leakage protection system all is " system of no ground compensation "; it is the function that this selective leakage protection system does not possess compensation low voltage electric network capacitive earth current; all unique zero-sequence reactor in the total leak detection relay of low voltage electric network is abolished and (perhaps directly replaced with resistance; perhaps at the other equivalent capacitance in parallel of zero-sequence reactor); this way has obviously increased the danger of personal electric shock; also increased the possibility of earth fault current actuation gas; this is obviously unfavorable in safety of coal mines, does not also meet the 4.2.4 bar of JB6314-92 and 5.14 explicit stipulation.
Three, Fa Ming content:
The application's purpose is must abolish the zero-sequence reactor compensate function at the existing mine low pressure selective leakage protection system of China can guarantee this defective of choosing leakage accuracy, invents a kind of earthing compensation process of mine low-voltage electricity grid selective leakage protection system.
The application's technical scheme is in existing mine low pressure selective leakage protection system, increases the function of compensation network capacitive earth current, and adopts the dispersion compensation mode to replace traditional centralized compensation mode.Promptly in being connected in each adjacent each branch switch of low-voltage bus bar, not only to installing choosing and leak protector, and must install zero-sequence reactor LK and three-phase reactor SK, produce inductive current I by LK
L, compensate this line mutual-ground capacitor electric current I
CAnd in the electric power incoming line master switch, only need the leak detection protector and the insulation monitoring device (as K Ω table) of installing additional dc power supply.
In this low pressure selective leakage protection system with ground compensation function, protector is leaked in each choosing along separate routes must can be adapted to various compensating coefficients such as undercompensation, compensation entirely, overcompensation.Publication number is that the patent of invention " mine low-voltage electricity grid sequential discriminating leakage selecting method and protector " of CN1657960A just can satisfy above-mentioned requirements fully.If system is in the undercompensation operation usually, protective device is leaked in choosing along separate routes also can adopt phase sensitivity principle or zero sequence power direction principle.
Good effect of the present invention is to guarantee the horizontal selectivity of selective leakage protection system and vertically optionally on the basis, increase is to the compensation equipment (zero-sequence reactor) of power-to-ground capacitance electric current, and employing respectively feeds out (dispersion) on the spot compensation way along separate routes, replace traditional power source bus place centralized compensation mode of (as by zero-sequence reactor among the JY-82), thereby obtain the effect of similar automatic tracking and compensating; This just makes mine low pressure selective leakage protection system guarantee that horizontal selectivity is with vertically optionally under the condition; the low voltage electric network capacitive earth current can be compensated to the numerical value of JB6314-92 defined again; and the not transition significantly that causes the earth fault leakage current because of the input or the excision of branched line, thereby can reduce personal electric shock injures and deaths and take precautions against the ground arc gas explosion of igniting.
Four, description of drawings
Fig. 1 is the system schematic of prior art scheme, and Fig. 2 is the system schematic of the embodiment of the invention.
Five, embodiment
As shown in Figure 2: mining transformer SB becomes low pressure (660V or 1140V) with the 6KV high-tension electricity, inserts total feeding switch, in total feeding switch, and through the neutral point connecting to neutral preface reactor LK of three-phase reactor SK, and through capacitor C
2Ground connection, LK is used for producing inductive current I
LTo compensate the capacitive earth current I of this shunt
CJDLX is patent of invention " mine low-voltage electricity grid sequential discriminating leakage selecting method and protector " (publication number is 1657960A).Among Fig. 2, JDLX obtains zero sequence current signal I by zero sequence current mutual inductor LH
0, again between SK neutral point and the earth through R
1, C
1, R
2Dividing potential drop obtains residual voltage U
0, the tripping operation of JDLX protector output signal SC control branch switch.
In the above-described embodiment, concrete compensation scheme has dual mode:
The one, the zero-sequence reactor LK in each branch switch adopts the undercompensation mode usually, and makes each I of along separate routes itself
L/ I
C=70%～80%.
The 2nd, the zero-sequence reactor LK in each branch switch adopts the overcompensation mode usually, and makes each I along separate routes
L/ I
C=120%～130%.
In the above-described embodiment, " leakage protection system selectively " its " selectivity " comprises horizontal selectivity and vertical two aspects of selectivity.As shown in Figure 2, " laterally selectivity " is to install the low pressure choosing respectively in each branch switch adjacent on same bus to leak protective device JDLX, undertakes the earth leakage protective of this circuit separately; " vertically selectivity " is the total leak detection of installing protective device in the electric power incoming line switch; and on operation time limit, select a Lou period of guard delay Δ t=200～300ms along separate routes than each; guarantee the temporal running order of the upper and lower level of longitudinal circuit with this, make total leak detection protection become each and select the backup protection of leaking protection along separate routes.Be located at choosing in each branch switch and leak protective device JDLX and only when this circuit generation single-phase earthing leak current fault, move, and be located at the leak detection protective device in higher level's master switch just starting when as long as the full electric network insulation level drops to Minimum Acceptable Value.
Claims (2)
1, a kind of earthing compensation process of mine low-voltage electricity grid selective leakage protection system; it is characterized in that in each adjacent branch switch of mine low pressure selective leakage protection system; protector, zero-sequence reactor LK and three-phase reactor SK are leaked in the installing choosing, produce inductive current I by each shunt zero-sequence reactor LK
L, compensate this line mutual-ground capacitor electric current I
C
2, the earthing compensation process of mine low-voltage electricity grid selective leakage protection system as claimed in claim 1 is characterized in that it is that protector is leaked in the choosing of JDLX type that protector is leaked in the choosing of installing in each branch switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100448201A CN100389527C (en) | 2005-09-27 | 2005-09-27 | Earthing compensation process for mine low-voltage electricity grid selective leakage protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100448201A CN100389527C (en) | 2005-09-27 | 2005-09-27 | Earthing compensation process for mine low-voltage electricity grid selective leakage protection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1767294A true CN1767294A (en) | 2006-05-03 |
| CN100389527C CN100389527C (en) | 2008-05-21 |
Family
ID=36742967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100448201A Expired - Fee Related CN100389527C (en) | 2005-09-27 | 2005-09-27 | Earthing compensation process for mine low-voltage electricity grid selective leakage protection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100389527C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789581A (en) * | 2010-03-31 | 2010-07-28 | 傅桂兴 | Four-stage selective leakage rapid protection system of IT grouping power grid |
| CN101593969B (en) * | 2009-07-03 | 2012-06-20 | 江苏金智科技股份有限公司 | Method for realizing station-to-station error prevention by using residual voltage of breaker port |
| CN102938303A (en) * | 2012-11-19 | 2013-02-20 | 北京天诚同创电气有限公司 | Three-phase reactor applied to three-phase four-wire system grid-connected converter |
| CN104682345A (en) * | 2013-11-28 | 2015-06-03 | 国家电网公司 | Leakage protecting circuit and leakage protecting method for circuit |
| CN113162013A (en) * | 2021-05-11 | 2021-07-23 | 龙跃潮 | Ground distribution capacitance current precompensation method and device of low-voltage IT power supply system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2077532A (en) * | 1980-06-04 | 1981-12-16 | Gen Electric Co Ltd | Earth leakage protection arrangement |
| CN86201119U (en) * | 1986-03-05 | 1988-12-28 | 山西矿业学院 | Selectable electric leakage protector for mine low voltage net |
| CN2073183U (en) * | 1990-08-20 | 1991-03-13 | 北京煤炭管理干部学院非标准机电设备厂 | Low voltage electrified wire netting selective electricity leakage protector used in mine |
| CN100412556C (en) * | 2005-01-31 | 2008-08-20 | 傅桂兴 | Low-voltage electric network sequential discriminating leakage selecting method and protector for mine |
-
2005
- 2005-09-27 CN CNB2005100448201A patent/CN100389527C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101593969B (en) * | 2009-07-03 | 2012-06-20 | 江苏金智科技股份有限公司 | Method for realizing station-to-station error prevention by using residual voltage of breaker port |
| CN101789581A (en) * | 2010-03-31 | 2010-07-28 | 傅桂兴 | Four-stage selective leakage rapid protection system of IT grouping power grid |
| CN101789581B (en) * | 2010-03-31 | 2013-03-13 | 傅桂兴 | Four-stage selective leakage rapid protection system of IT grouping power grid |
| CN102938303A (en) * | 2012-11-19 | 2013-02-20 | 北京天诚同创电气有限公司 | Three-phase reactor applied to three-phase four-wire system grid-connected converter |
| CN102938303B (en) * | 2012-11-19 | 2015-08-19 | 北京天诚同创电气有限公司 | Three-phase reactor applied to three-phase four-wire system grid-connected converter |
| CN104682345A (en) * | 2013-11-28 | 2015-06-03 | 国家电网公司 | Leakage protecting circuit and leakage protecting method for circuit |
| CN113162013A (en) * | 2021-05-11 | 2021-07-23 | 龙跃潮 | Ground distribution capacitance current precompensation method and device of low-voltage IT power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100389527C (en) | 2008-05-21 |
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Granted publication date: 20080521 Termination date: 20160927 |