CN104779576A - Selective leakage protection method and system by composite signal method - Google Patents
Selective leakage protection method and system by composite signal method Download PDFInfo
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- CN104779576A CN104779576A CN201510188901.2A CN201510188901A CN104779576A CN 104779576 A CN104779576 A CN 104779576A CN 201510188901 A CN201510188901 A CN 201510188901A CN 104779576 A CN104779576 A CN 104779576A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002131 composite material Substances 0.000 title claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 238000009413 insulation Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 230000001012 protector Effects 0.000 abstract 4
- 230000007257 malfunction Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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Abstract
The invention discloses a selective leakage protection method and a system by a composite signal method, wherein the method comprises the steps of injecting an additional detection direct current signal while a main line is powered on with alternating current, and a low-voltage protector of a main switch always detects the insulation condition of the whole power supply line through the additional detection direct current signal; when the low-voltage protector of the main switch detects that insulation is reduced to be lower than a threshold value, the low-voltage protector of the main switch injects additional alternating current generated by an alternating current generator into a power supply line from a main line through a signal injection control component, wherein the phase current direction of the additional alternating current is different from the phase voltage of the power supply alternating current; when the power direction type leakage protector in the branch switch of one branch line detects the zero sequence current of the additional alternating current, the fact that the current leakage exists in the branch line is judged, and the branch line is immediately cut off. The invention can ensure that the branch switch correctly selects the grounding leakage circuit to achieve the aim of selective leakage protection.
Description
Technical field
The invention belongs to power supply technique field, colliery, particularly relate to a kind of selective earth leakage protection method and system.
Background technology
In underground coal mine low-voltage explosion-proof feeding switch; requirement must install selective earth leakage protection; object is when electric leakage appears in a branch road; the selective leakage of the feeding switch (hereinafter referred to as switch-dividing) of this branch road starts; this branch road of tripping; and make electric power system recover normal, guarantee the safety of electric power system.But, often because the selective earth leakage protection of switch-dividing does not have selectivity, there is feeding switch tripping or malfunction, be arranged on the situations such as feeding switch (hereinafter referred to as the master switch) malfunction of wire inlet loop, had a strong impact on the normal production in colliery.
The earth leakage protective of current down-hole low voltage feeder system is achieved in that
Additional direct current signal in master switch; the insulation against ground resistance that additional direct current signal produces in systems in which measured by master switch always, when this resistance is less than a certain resistance value, and the earth leakage protective start-up study tripping operation of master switch; wait for that switch-dividing cuts off the duplexure of ground connection, make insulation recovery.If branch switch can not selected not excise the duplexure occurring electric leakage in master switch delay time, total switch-dividing is tripping operation just, cuts off the power supply of whole low-pressure system.
The selective earth leakage protection of switch-dividing adopts zero sequence power direction earth leakage protective.Its principle is, when electric leakage appears in system, will produce residual voltage and zero-sequence current; in principle, bus is pointed in the zero-sequence current direction of loop of electric leakage, and non-loop of electric leakage power direction points to circuit; judge that whether oneself is loop of electric leakage, reaches the object of selective earth leakage protection with this.In fact, underground coal mine low-pressure system is isolated neutral system, and the leakage current of low-pressure system is exactly all cables and equipment capacitance current over the ground.Because low-pressure system cable is thinner, cable length is shorter, the direct-to-ground capacitance of whole low-pressure system is very little, particularly when single phase to ground via resistance (reduction of also namely insulating), capacity current is less, and switch-dividing has no idea correctly to quantitatively judge out the direction of zero-sequence current, thus, often there is malfunction or tripping, also result in the malfunction of master switch.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of composite signal method selective earth leakage protection method, and the method can make switch-dividing correctly select earth leakage circuit, reaches the object of selective earth leakage protection, to overcome the defect that prior art exists.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of composite signal method selective earth leakage protection method, in the supply line in application colliery, the multiple points of circuits that described supply line comprises main line and is connected with main line, main line is provided with on master switch, point circuit and is provided with switch-dividing, in master switch, there is low voltage protection device for electrophonic, there is in switch-dividing power direction type earth leakage protective device, it is characterized in that: while main line leads to supply and AC electricity, inject additional detected direct current signal, the low voltage protection device for electrophonic of master switch detects the insulation status of whole supply line always by this additional detected direct current signal; When the low voltage protection device for electrophonic of described master switch detects that insulation is reduced to lower than threshold value, the additional alternating current that ac generator is produced by control signal injection device by the low voltage protection device for electrophonic of described master switch injects supply line from main line, and each phase current direction of described additional alternating current is different from each phase voltage of described supply and AC electricity; When power direction type earth leakage protective device in the switch-dividing of a point of circuit wherein detects the zero-sequence current of described additional alternating current, then judge that well-behaved circuit exists electric leakage, cut off well-behaved circuit immediately.
Described additional alternating current is industrial frequency AC electric current.
Described industrial frequency AC electric current only injects two nonisulated reduction phases of supply line.
Two phase voltage 90 ° of two nonisulated reduction phases of the advanced supply line of described industrial-frequency alternating current stream difference.
In addition, the present invention also provides a kind of composite signal method selective earth leakage protection system, comprise the master switch being located at main line and the switch-dividing being located at point circuit, in described master switch, there is low voltage protection device for electrophonic, there is in described switch-dividing power direction type earth leakage protective device, it is characterized in that: in described master switch, be also provided with additional straight leakage resistance detection part, signal injection control assembly, AC signal generator, described additional straight leakage resistance detection part to be arranged on main line and to be connected with low voltage protection device for electrophonic, low voltage protection device for electrophonic is connected to signal injection control assembly, AC signal generator one end ground connection, the other end is also connected to described signal injection control assembly, described signal injection control assembly is connected to main line.
Adopt technique scheme; the present invention adds on the basis of direct current at master switch; add an additional AC signal; assist switch-dividing correctly can select ground path with this; reach the object of selective earth leakage protection, overcome the switch-dividing malfunction of prior art existence or the defect of tripping and master switch malfunction.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail:
Fig. 1 is the structural representation of supply line;
Fig. 2 is the structural representation of master switch.
Embodiment
As shown in Figure 1, in the supply line in colliery, comprise main line and many point circuits be connected with main line, main line is provided with on master switch 100, point circuit and is provided with switch-dividing 200.There is in switch-dividing 200 power direction type earth leakage protective device.
As shown in Figure 2, master switch 100 comprises additional straight leakage resistance detection part 101, low voltage protection device for electrophonic 102, signal injection control assembly 103, AC signal generator 104.Wherein, additional straight leakage resistance detection part 101 to be arranged on main line and to be connected with low voltage protection device for electrophonic 101, and low voltage protection device for electrophonic 102 is connected to signal injection control assembly 103.AC signal generator 104 ground connection, its three-phase exports the AC signal input being wired to signal injection control assembly 103, and the three-phase of AC signal generator 104 exports electric wire and is connected respectively on the three-phase wire of main line again.
The working method of this composite signal method selective earth leakage protection system is:
While main line leads to supply and AC electricity, inject additional detected direct current signal, the low voltage protection device for electrophonic of master switch detects the insulation status of whole supply line always by this additional detected direct current signal; When the low voltage protection device for electrophonic of master switch detects that insulation is reduced to lower than threshold value; (upper seamount source company produces the low voltage protection device for electrophonic control signal injection device of master switch; model is SY3606) the additional alternating current of ac generator generation is injected two nonisulated reductions of supply line mutually from main line, additional alternating current is industrial frequency AC electric current.Each phase current direction of additional alternating current is different from each phase voltage of described supply and AC electricity, two phase voltage 90 ° of two nonisulated reduction phases of the advanced supply line of this industrial-frequency alternating current stream difference.When power direction type earth leakage protective device in the switch-dividing of a point of circuit wherein detects that the zero-sequence current of this additional alternating current exceedes threshold value, then judge that well-behaved circuit exists leak current fault, cut off well-behaved circuit immediately.
After pending fault elimination, insulation recovery, master switch is cancelled AC signal and is injected.
The present invention adds on the basis of direct current at master switch; add an additional AC signal; assist switch-dividing correctly can select ground path with this, reach the object of selective earth leakage protection, overcome the switch-dividing malfunction of prior art existence or the defect of tripping and master switch malfunction.
The above; it is only preferred embodiment of the present invention; not any pro forma restriction is done to the present invention; have in any art and usually know the knowledgeable; if in the protection range not departing from claim proposed by the invention; utilize the Equivalent embodiments that the local done by disclosed technology contents is changed or modified, and do not depart from technical characteristic content of the present invention, all still belong in the scope of the technology of the present invention feature.
Claims (5)
1. a composite signal method selective earth leakage protection method, in the supply line in application colliery, the multiple points of circuits that described supply line comprises main line and is connected with main line, main line is provided with on master switch, point circuit and is provided with switch-dividing, in master switch, there is low voltage protection device for electrophonic, there is in switch-dividing power direction type earth leakage protective device, it is characterized in that: while main line leads to supply and AC electricity, inject additional detected direct current signal, the low voltage protection device for electrophonic of master switch detects the insulation status of whole supply line always by this additional detected direct current signal; When the low voltage protection device for electrophonic of described master switch detects that insulation is reduced to lower than threshold value, the additional alternating current that ac generator produces by the low voltage protection device for electrophonic control signal injection control assembly of described master switch injects supply line from main line, and each phase current direction of described additional alternating current is different from each phase voltage of described supply and AC electricity; When power direction type earth leakage protective device in the switch-dividing of a point of circuit wherein detects the zero-sequence current of described additional alternating current, then judge that well-behaved circuit exists electric leakage, cut off well-behaved circuit immediately.
2. composite signal method selective earth leakage protection method according to claim 1, is characterized in that: described additional alternating current is industrial frequency AC electric current.
3. composite signal method selective earth leakage protection method according to claim 2, is characterized in that: described industrial frequency AC electric current only injects two nonisulated reduction phases of supply line.
4. composite signal method selective earth leakage protection method according to claim 3, is characterized in that: two phase voltage 90 ° of two nonisulated reduction phases of the advanced supply line of described industrial-frequency alternating current stream difference.
5. a composite signal method selective earth leakage protection system, comprise the master switch being located at main line and the switch-dividing being located at point circuit, in described master switch, there is low voltage protection device for electrophonic, there is in described switch-dividing power direction type earth leakage protective device, it is characterized in that: in described master switch, be also provided with additional straight leakage resistance detection part, signal injection control assembly, AC signal generator, described additional straight leakage resistance detection part to be arranged on main line and to be connected with low voltage protection device for electrophonic, low voltage protection device for electrophonic is connected to signal injection control assembly, AC signal generator one end ground connection, the other end is also connected to described signal injection control assembly, described signal injection control assembly is connected to main line.
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| CN201510188901.2A CN104779576B (en) | 2015-04-20 | 2015-04-20 | Selective leakage protection method and system by composite signal method |
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Cited By (4)
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| CN109524942A (en) * | 2017-09-18 | 2019-03-26 | 空中客车运营简化股份公司 | Electric link including electrical protection systems |
| CN112653075A (en) * | 2020-12-15 | 2021-04-13 | 刘景福 | Shunt leakage detection system and implementation method thereof |
| CN112840518A (en) * | 2018-11-19 | 2021-05-25 | Ls电气株式会社 | Residual current circuit breaker and control method thereof |
| CN115951114A (en) * | 2023-01-17 | 2023-04-11 | 上海山源电子科技股份有限公司 | Current signal identification method in power supply monitoring system |
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| CN112653075A (en) * | 2020-12-15 | 2021-04-13 | 刘景福 | Shunt leakage detection system and implementation method thereof |
| CN115951114A (en) * | 2023-01-17 | 2023-04-11 | 上海山源电子科技股份有限公司 | Current signal identification method in power supply monitoring system |
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| CN104779576B (en) | 2017-12-22 |
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Address after: Room 209, 2nd Floor, Building 3, No. 588 Caolong Road, Songjiang District, Shanghai, 2016 Patentee after: Shanghai Sany Electronic Technology Co.,Ltd. Country or region after: China Address before: 201612 room 505, building 23, No. 518, Xinzhuan Road, Songjiang high tech park, Caohejing Development Zone, Songjiang District, Shanghai Patentee before: Shanghai Sany Electronic Technology Co.,Ltd. Country or region before: China |
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