CN2679899Y - Selectivity leakage protector of mine low voltage electrical network - Google Patents
Selectivity leakage protector of mine low voltage electrical network Download PDFInfo
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- CN2679899Y CN2679899Y CN 200320128049 CN200320128049U CN2679899Y CN 2679899 Y CN2679899 Y CN 2679899Y CN 200320128049 CN200320128049 CN 200320128049 CN 200320128049 U CN200320128049 U CN 200320128049U CN 2679899 Y CN2679899 Y CN 2679899Y
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Abstract
The utility model relates to a selectivity leakage protector of mine low voltage electrical network, which has four functions: selectivity leakage protection, leakage atresia, leakage backup protection and artificial leakage test. The utility model is a great improvement for the leakage protector in the KXL-I type which has passed the ministerial level identification. The utility model reserves the original function and considers the installation and maintenance needs, and the utility model assembles the components which are easy to be changed and affects the search of the line fault reason in a plug box. If the device has faults, the whole can be taken off entirely and a new component replaces the device which has faults; if the line has faults, the plug can be taken off and the insulation is shaken and measured. The selectivity leakage protector of mine low voltage electrical network can be installed in the explosion proof case of branched feed switch, the original power transformation chamber is not needed to be altered, external cable connection is not needed to be increased, the equipment investment is little, the installation is easy, and the maintenance and the repair are convenient.
Description
The present invention relates to a kind of mining low voltage electric network property selected earth leakage protective device, be particularly useful for the low-voltage power supply system selective leakage protection device that colliery low pressure underground electric network is an isolated neutral system.
Power supply grid low pressure under the coal mine (1140V, 660V, 380V) is isolated neutral system, and during single-phase electric leakage, leakage current is very little, as direct ground connection, leakage current is no more than 400mA, but electric leakage easily causes the accident of human electric shock when long, or forms phase fault and cause more major break down.Past is adopted the leak detection relay of additional dc power supply principle always, the electric leakage of electrical network one place, and the leak detection relay action causes whole grid power blackout.Beginning in 1988 is promoted at colliery system and has been passed through the KXL-I selective leakage protection device that ministerial level is identified for this reason; it has adopted detection and control circuits such as zero-sequence current direction type; can distinguish fault branch and non-fault branch; and possess have prevent to the fault point force send the electricity the earth leakage search/lockout function; and open failure branch road only; and do not influence the normal operation of other branch road; thereby reduce the grid power blackout scope; can be installed in branch's feeding switch explosion-proof shell; need not change former power transformation chamber, therefore obtain the consistent favorable comment of user in actual use.But this device also has some deficiency, many as device, two transformers are arranged, two plug-in units, volume is big, and is heavier, device such as two transformers and signal plate zero sequence current mutual inductor and circuit need be placed on the switch fuse behind, easy care not when being out of order, fault of device own and line fault are not easily distinguishable, and can not survey insulation etc. during line fault.
The purpose of this invention is to provide a kind of mining low voltage electric network property selected earth leakage protective device; on the basis of KXL-I type device and take into full account this Unit Installation and use and safeguard under the condition that needs; by its part mechanical structure, electronic circuit are improved; can not only keep the original device all functions to reach; and integral body is taken off and is more renewed part rapidly when device has fault; there is fault to shake as circuit and surveys insulation; and the energy extension fixture life-span; make work more reliable; for the user saves installation and maintenance time and expense, reduce labour intensity.
The purpose of this utility model realizes by following scheme; the mining low voltage electric network property selected earth leakage protective device is connected with the branch road feeding switch; this device comprises power transformer (T1); zero sequence current mutual inductor (CT); tripping coil (TQ); experiment resistance (R); inductance coil (L); the sampling residual voltage is installed; direct voltage; the signal circuit board (XHB) of earth leakage search/lockout and switch switching signal circuit; be integrated with the wiring board (XLB) of selective earth leakage protection and earth leakage search/lockout signal processing and contact switching relay circuit; and with power transformer (T1); experiment resistance (R); inductance coil (L) and signal circuit board (XHB) and wiring board (XLB) are assembled in the card cage (5); this card cage (5) is fixed on the card cage mounting panel (6), and card cage mounting panel (6) is installed in the side of feeding switch fuse (3) by circuit breaker set bolt (7).Need not change switch when this sampling device has fault, just integral body is taken off and is more renewed part rapidly, can significantly save installation and maintenance time and expense, reduces labour intensity.
For reducing the volume of plug-in unit, and can work in coal gas, humidity, the serious adverse circumstances of dust, with zero sequence current mutual inductor (CT), the signal circuit board (XHB) of sampling residual voltage, direct voltage, earth leakage search/lockout and switch switching signal circuit is installed, adopts the resin embedding to become an integral body respectively.Thereby make circuit obtain sealing, volume is little, and the life-span is long, and fault is few, and can directly be packed in the fuse side of feeding switch, is convenient to maintenance and replacing.
For making this device have selective earth leakage protection and earth leakage search/lockout function simultaneously; tripping coil in the feeding switch (TQ) is directly by main circuit power supply; between tripping coil (TQ) and main circuit power supply, seal in an inductance coil (L), the 42V winding in transformer in the original device (T1) coil is removed.When action was leaked in choosing like this, because tripping coil does not seal in inductance coil, coil turn was few, and operating current is big, and electromagnetic actuation is fast; Tripping coil seals in inductance coil during block action, and operating current is little, and the electromagnet responsiveness is slow, charged adhesive in the time of can growing, and the inductance coil that seals in can prevent to switch on when tripping coil is long and burn out.When the feeding switch branch was had no progeny if any leak current fault, tripping coil was in attracting state, caused the mechanical mechanism of switch handgrip can not hang up hook, and realized the earth leakage search/lockout function, and method is simple for this.Directly power to former tripping coil (TQ) owing to adopt by 660V/380V, reduced the load capacity and the volume that insert the wiring board supply transformer (T1) of Switching Power Supply side, make (T1) transformer capacity become 8W by 53W, volume reduces greatly.
Switch closes a floodgate and send signal of telecommunication sample circuit to comprise diode (D8), resistance (R17), field effect transistor (Q2), field effect transistor (Q2) gate pole is connected on the output (5) of signal circuit board (XHB), and link to each other with ground by resistance (R17), its (Q2) source electrode links to each other with ground, (Q2) coil one end of drain electrode and the negative electrode of diode (D8) and relay (3ZJ), (4ZJ) mutually and connect, (3ZJ), (4ZJ) coil is directly powered cancellation original device switch load side transformer (T2) and regulator rectifier circuit by mains side transformer (T1).Thereby saved transformer (T2) and regulator rectifier circuit, changed by diode, resistance sampling and switch and send the signal of telecommunication, promotion field effect transistor conducting (3ZJ), (4ZJ) have electronic work; Field effect transistor does not have electricity by (3ZJ), (4ZJ), realizes the node conversion.
Card cage (5) adopts standard L6.2 (12) core connector (4) to link to each other with external circuit.The 660V/380V power supply is directly communicated by the internal circuit that connector (4) enters card cage (5), and device cost is low, and it is more reliable to peg graft.Dial L6.2 (12) the core connector of standard down, the insulation that can measure outside line.
The device zero sequence current mutual inductor adopts internal diameter 57mm, external diameter 66mm, 1J85 iron core, finished product internal diameter 47mm.It is more convenient to wear cable, and can strengthen the cable core cross section, has increased the fail safe of switch when big load.
Zero sequence current mutual inductor (CT) is added in inlet wire side, outlet side or its back.
Test resistance changes a plurality of resistance into by a resistance and is in parallel or connects, thereby the all-in resistance volume reduces.
The utlity model has following advantage:
1, this device directly is installed on the side of branch's feeding switch fuse (3), therefore can not reduce under the former defencive function situation, realizes not taking apart the pass fuse and just can install and change.Like this when device has fault rapidly integral body take off and more renew part, have the desirable standard connector (4) down of fault to shake as circuit and survey insulation, can save maintenance time and expense for the user, reduce Coal Production downtime, reduce labour intensity.
2, this device directly is installed on branch feeding switch inside, so need not the quick-fried equipment of setting up defences in addition, need not to increase the external cable wiring, need not change former power transformation ketone chamber, is convenient to standardized management.
3; owing to removed (T2) transformer and the regulator rectifier circuit of switch load side; reduced the volume of T1 transformer and test resistance; thereby can be with all parts (the signal plate XHB except that zero sequence current mutual inductor; the T1 transformer; experiment resistance; inductance coil; wiring board XLB) is combined in the box; and preserved former protective device and selected leakage and earth leakage search/lockout function; make device safeguard that power circuit is more convenient; and can under the situation of not dismantling the switch fuse, directly install this protective device additional; and can link to each other with external circuit by a L6.2 standard connector; so both reduced production cost, it is more reliable to work, and dials down the insulation situation that L6.2 standard connector can be measured outside line when grid side insulation or device damage.
4, have selective earth leakage protection, earth leakage search/lockout function, can prevent has increased Supply Security to the mandatory electricity that send in fault point.It is more convenient to wear cable, and can strengthen the cable core cross section, has increased the fail safe of switch when big load.
Description of drawings of the present utility model is as follows:
Fig. 1 is the scheme of installation of the utility model in feeding switch fuse side.
Fig. 2 is the front view of card cage mounting panel;
Fig. 3 is the vertical view of card cage mounting panel;
Fig. 4 is former T1 transformer 42V winding and tripping coil (TQ) connecting circuit
Fig. 5 is the tripping coil (TQ) and major loop connecting circuit of the utility model
Fig. 6 is former T2 transformer and regulator rectifier circuit
The switch of Fig. 7 the utility model closes a floodgate and send signal of telecommunication circuit
Below in conjunction with accompanying drawing detailed structure of the present utility model is described.
Be connected with the branch road feeding switch at the mining low voltage electric network property selected earth leakage protective device shown in Figure 1; this device comprises power transformer (T1); zero sequence current mutual inductor (CT); tripping coil (TQ); experiment resistance (R); inductance coil (L); the sampling residual voltage is installed; direct voltage; the signal circuit board (XHB) of earth leakage search/lockout and switch switching signal circuit; be integrated with the wiring board (XLB) of selective earth leakage protection and earth leakage search/lockout signal processing and contact switching relay circuit; and with power transformer (T1); experiment resistance (R); inductance coil (L) and signal circuit board (XHB) and wiring board (XLB) are assembled in the card cage (5); this card cage (5) is fixed on the card cage mounting panel (6), and card cage mounting panel (6) is installed in the side of feeding switch fuse (3) by circuit breaker set bolt (7).This mounting means makes card cage be easy to change or maintenance.
Fig. 2 is the front view of card cage mounting panel (6), and Fig. 3 is its vertical view.Card cage mounting panel (6) links together through circuit breaker set bolt (7) by installing hole on it (8) and feeding switch fuse (3).
Above-mentioned zero sequence current mutual inductor (CT) is equipped with the signal circuit board (XHB) of sampling residual voltage, direct voltage, earth leakage search/lockout and switch switching signal circuit, uses the resin embedding respectively.Thereby make circuit obtain sealing, volume reduces, and the life-span prolongs, and fault reduces, and can work in humidity, the serious adverse circumstances of dust.
In Fig. 4, circuit shown in Figure 5, the 42V winding of former (T1) transformer shown in Figure 4 is removed, tripping coil in the feeding switch (TQ) is directly by main circuit power supply, between tripping coil (TQ) and main circuit power supply, seal in an inductance coil (L), when action was leaked in choosing like this, because tripping coil (TQ) does not seal in inductance coil (L), coil turn was few, operating current is big, and electromagnetic actuation is fast; Tripping coil during block action (TQ) seals in an inductance coil (L), and operating current is little, and the electromagnet responsiveness is slow, charged adhesive in the time of can growing, and the inductance coil that seals in can prevent to switch on when tripping coil is long and burn out.When the feeding switch branch was had no progeny if any leak current fault, tripping coil was in attracting state, caused the mechanical mechanism of switch handgrip can not hang up hook, and realized the earth leakage search/lockout function, and method is simple for this.Because employing directly to former TQ coil power supply, has reduced the load capacity that inserts the wiring board supply transformer T1 of Switching Power Supply side by 660V/380V, makes the T1 transformer capacity become 8W by 53W, volume reduces greatly.
Fig. 6 is former T2 transformer and regulator rectifier circuit, and in the utility model, this circuit is removed.Circuit is more reduced the number of, and wiring board is littler, and has reduced cost.
Send signal of telecommunication sample circuit to comprise diode (D8), resistance (R17), field effect transistor (Q2) at switch combined floodgate shown in Figure 7, field effect transistor (Q2) gate pole is connected on the output (5) of signal circuit board (XHB), and link to each other with ground by resistance (R17), its (Q2) source electrode links to each other with ground, (Q2) coil one end of drain electrode and the negative electrode of diode (D8) and relay (3ZJ), (4ZJ) mutually and connect, (3ZJ), (4ZJ) coil is directly powered cancellation original device switch load side transformer (T2) and regulator rectifier circuit by mains side transformer (T1).Thereby saved transformer (T2) and regulator rectifier circuit, changed by diode, resistance sampling and switch and send the signal of telecommunication, promotion field effect transistor conducting (3ZJ), (4ZJ) have electronic work; Field effect transistor does not have electricity by (3ZJ), (4ZJ), realizes the node conversion.
Card cage (5) adopts standard L6.2 (12) core connector (4) to link to each other with external circuit, and the 660V/380V power supply is directly communicated by the internal circuit that connector (4) enters card cage (5), and device cost is low, and it is more reliable to peg graft.L6.2 standard connector (4) can be measured the insulation situation of outside line under dialling.
The utility model zero sequence current mutual inductor, it has adopted internal diameter 57mm, external diameter 66mm, 1J85 iron core, finished product internal diameter 47mm.It is more convenient to wear cable, and can strengthen the cable core cross section, has increased the fail safe of switch when big load.Zero sequence current mutual inductor (CT) is added in inlet wire side, outlet side or its back.
Test resistance R changes a plurality of resistance into by a resistance and is in parallel or connects, thereby the all-in resistance volume reduces.
Because the utility model is to select the improvement carried out on the basis of property earth leakage protective device at the mining low voltage electric network of KXL-I, therefore the part that does not make improvements for primary circuit and structure is not described in detail in this.
Claims (7)
1; a kind of mining low voltage electric network property selected earth leakage protective device; be connected with the branch road feeding switch; comprise power transformer (T1); zero sequence current mutual inductor (CT); tripping coil (TQ); experiment resistance (R); inductance coil (L); the sampling residual voltage is installed; direct voltage; the signal circuit board (XHB) of earth leakage search/lockout and switch switching signal circuit; be integrated with the wiring board (XLB) of selective earth leakage protection and earth leakage search/lockout signal processing and contact switching relay circuit; it is characterized in that; this device is with power transformer (T1); experiment resistance (R); inductance coil (L) and signal circuit board (XHB) and wiring board (XLB) are assembled in the card cage (5); this card cage (5) is fixed on the card cage mounting panel (6), and card cage mounting panel (6) is installed in the side of feeding switch fuse (3) by circuit breaker set bolt (7).
2, selective low-voltage leakage protector as claimed in claim 1; it is characterized in that; zero sequence current mutual inductor (CT) is equipped with the signal circuit board (XHB) of sampling residual voltage, direct voltage, earth leakage search/lockout and switch switching signal circuit, uses the resin embedding respectively.
3, selective low-voltage leakage protector as claimed in claim 2; it is characterized in that; tripping coil in the said feeding switch (TQ) is directly by main circuit power supply; between tripping coil (TQ) and main circuit power supply, seal in an inductance coil (L), the 42V winding in transformer in the original device (T1) coil is removed.
4; selective low-voltage leakage protector as claimed in claim 2; it is characterized in that; switch closes a floodgate and send signal of telecommunication sample circuit to comprise diode (D8); resistance (R17); field effect transistor (Q2); field effect transistor (Q2) gate pole is connected on the output (5) of signal circuit board (XHB); and link to each other with ground by resistance (R17); its (Q2) source electrode links to each other with ground; (Q2) negative electrode and the relay (3ZJ) of drain electrode and diode (D8); coil one end phase (4ZJ) also connects; (3ZJ); (4ZJ) coil is directly powered by mains side transformer (T1), cancellation original device switch load side transformer (T2) and regulator rectifier circuit.
5, selective low-voltage leakage protector as claimed in claim 1 is characterized in that, card cage (5) adopts standard L6.2 (12) core connector (4).
6, selective low-voltage leakage protector as claimed in claim 1 is characterized in that, the device zero sequence current mutual inductor adopts internal diameter 57mm, external diameter 66mm, 1J85 iron core, finished product internal diameter 47mm.
7, selective low-voltage leakage protector as claimed in claim 1 is characterized in that, zero sequence current mutual inductor (CT) is added in inlet wire side or outlet side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320128049 CN2679899Y (en) | 2003-12-18 | 2003-12-18 | Selectivity leakage protector of mine low voltage electrical network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320128049 CN2679899Y (en) | 2003-12-18 | 2003-12-18 | Selectivity leakage protector of mine low voltage electrical network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2679899Y true CN2679899Y (en) | 2005-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320128049 Expired - Fee Related CN2679899Y (en) | 2003-12-18 | 2003-12-18 | Selectivity leakage protector of mine low voltage electrical network |
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| Country | Link |
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| CN (1) | CN2679899Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807758A (en) * | 2010-04-13 | 2010-08-18 | 河北工业大学 | Test electric connector of low voltage breaker |
-
2003
- 2003-12-18 CN CN 200320128049 patent/CN2679899Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807758A (en) * | 2010-04-13 | 2010-08-18 | 河北工业大学 | Test electric connector of low voltage breaker |
| CN101807758B (en) * | 2010-04-13 | 2012-11-14 | 河北工业大学 | Test electric connector of low voltage breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |