CN2073183U - Low voltage electrified wire netting selective electricity leakage protector used in mine - Google Patents
Low voltage electrified wire netting selective electricity leakage protector used in mine Download PDFInfo
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- CN2073183U CN2073183U CN 90217995 CN90217995U CN2073183U CN 2073183 U CN2073183 U CN 2073183U CN 90217995 CN90217995 CN 90217995 CN 90217995 U CN90217995 U CN 90217995U CN 2073183 U CN2073183 U CN 2073183U
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- earth leakage
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Abstract
The utility model discloses a low voltage electric network electricity leakage protector used in mine which is used to discriminate, and cut off the fault branch circuit of a low voltage electric network in coal mine. Each of electric elements is assembled into components according to function, and is arranged on a bottom board according to a certain position, forming a component; the bottom board is directly arranged in the explosion-proof casing of branch feeding switch of electric network. The low voltage electric network electricity leakage protector used in mine achieves the purpose of integration of a switch, and selective leakage protection, as well as the function of electricity leakage closing. The explosion-proof device, and external cable connecting line are not needed, without changing the layout of equipment of an original electric chamber, and the area of the original electric chamber. The utility model has the advantages of convenient management, less investment, and convenient installation and operation.
Description
A kind of low voltage electric network property selected earth leakage protective device; link to each other with the branch road feeding switch; and form by several parts such as transformer, zero sequence current mutual inductor, sample of signal plate, signal processing circuit plate and contact switching relay plates, be applicable to that the colliery underground low-tension network is an isolated neutral system.
At present; the low voltage electric network that uses under the coal mine property selected earth leakage protective device all adopts the basic principle of zero-sequence current direction type; the method that the phase place of electrical network residual voltage and each branch road zero-sequence current compares when promptly adopting electric leakage; to distinguish fault branch and normal branch road; and open failure branch road only; and do not influence the normal operation of other branch road, the production and the safety in colliery has been played important function.The product of existing several models is broadly divided into two classes.One class is centralized, and product has BJJ
1Type, BJJ
2Type, this series products concentrates on the backup protection of selectivity branch protection and deferred action in the explosion-proof chamber, make an antiknock device, zero sequence current mutual inductor is then made single being enclosed within each branch road outlet, thus this select neglected loading put with instrument transformer between, select neglected loading put with the branch feeding switch between need be connected with cable; Another kind of is monomer-type, and product has BJJ
3Type, this series products are protection to be leaked in the choosing of each branch make an explosion isolation device, and promptly each branch switch need be joined one and selected neglected loading to put, has increased the quantity of antiknock device, and has needed to increase the area of power transformation chamber.Though the said goods all is the device with two-stage defencive function that branch branch switch selective earth leakage protection instantaneous operation, total feeding switch match with the backup protection of deferred action; but all exist a common defective equally, promptly all be provided with a new explosion isolation device in addition.A series of problems have been brought therefrom: increased heavy explosion-proof device, and needed external cable, and wanted the layout of the former power transformation chamber of corresponding change or increase its area, be unfavorable for the standardized management of power transformation chamber; The equipment manufacturing cost height, investment is big, and this product of two types does not possess again for realizing and prevents to force the earth leakage search/lockout function of sending electricity to the fault point simultaneously.
The purpose of this utility model is to provide a kind of defective of avoiding above-mentioned prior art, and what possess simultaneously the earth leakage search/lockout function again directly is installed on selective leakage protection device in branch's feeding switch.
The purpose of this utility model realizes by following measure:
Because the space in the feeding switch is limited; in order to realize the purpose of " switch " and " protection " the two unification; the utility model is assembled into parts with each electric component by its function, as: obtain the sampled signal plate (XHB) of residual voltage and direct voltage and earth leakage search/lockout signal, zero sequence current mutual inductor (CT), selective earth leakage protection and the earth leakage search/lockout signal of obtaining zero sequence current signal is in wiring board (XLB), contact switching relay plate (JQB) and power transformer (T
1) and to the relay board power transformer (T of relay board power supply
2) wait parts.Each parts is loaded on the base plate by certain position, forms an assembly, again this base plate is installed in feeding switch fuse bakelite base plate back by on the position of top.
For the ease of the miniaturization of assembly, and electric clearance is satisfied the criteria, adopt the method for resin embedding, envelope is irritated and has been made up signal plate (XHB) and the zero sequence current mutual inductor (CT) that is formed by connecting by tens elements, thereby makes its volume very little.In addition, the installation site of assembly considers that also the life-span is long, and fault parts few, that must not keep in repair are loaded on the switch fuse behind, short parts of life-span as: wiring board (XLB) and relay board (JQB) then are loaded on switch handgrip one side, are convenient to maintenance and replacing.
In order to make this device have the function of selective earth leakage protection and earth leakage search/lockout simultaneously, adopted to change the line bag in the former feeding switch with tapped tripping coil winding.Be with tapped winding 0-1-2, (1 is centre tap); The 0-1 winding, the number of turn is few, and operating current is big, and electromagnetic actuation is fast, is used for choosing and leaks action; The 0-2 umber of turn is many, operating current is little, the electromagnet responsiveness is slow, but charged adhesive in the time of can growing, 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 realize the earth leakage search/lockout function, method is simple for this.This tripping coil adopts low voltage power supply in addition, so safe and reliable.
The utlity model has following advantage:
1, because this protective device is directly to be installed on branch feeding switch inside, thereby does not need to establish in addition heavy antiknock device and increase the external cable wiring, need not change the apparatus arrangement and the chamber area of former power transformation chamber, be convenient to standardized management;
2, equipment investment is few, installs and uses all flexible;
3, when having had the selective earth leakage protection function, also have the earth leakage search/lockout function, can prevent has increased Supply Security to the mandatory electricity that send in fault point.
Description of drawings of the present utility model is as follows:
Fig. 1 is the mutual alignment graph of a relation of each component-assembled on base plate in the utility model;
Fig. 2 is the upward view of Fig. 1;
Fig. 3 is the scheme of installation of the utility model at the feeding switch fuse back side.
Below in conjunction with accompanying drawing detailed structure of the present utility model is described:
Referring to Fig. 1,2, power transformer (T
1) 1 be arranged at the upper right corner place of base plate 5; Relay board power transformer (T
2) 2 be in the lower right corner of base plate 5; Residual voltage, direct voltage and earth leakage search/lockout sample of signal plate (XHB) 3 adopt the resin embedding to become small-sized black box with zero sequence current mutual inductor (CT) 4 respectively, sample of signal plate (XHB) 3 is arranged in the upper left side of base plate 5, and 4 of zero sequence current mutual inductors (CT) place and parallel with the top edge of base plate 5 and with the adjacent and horizontal arrangement of sample of signal plate (XHB) 3; Selective earth leakage protection and earth leakage search/lockout signal processing circuit plate (XLB) 6 then are to be contained on the base plate 5 left end socket supports 8 with contact switching relay plate (JQB) 7.This arrangement makes consumable accessory 6 and 7 be arranged on switch handgrip one side, is easy to change or maintenance.
By the utility model protective device that above-mentioned arrangement is assembled into one, integrally be installed in the back side of fuse in the branch road feeding switch, see Fig. 3, its connected mode is with stay bolt 9 base plate 5 to be connected on the position of two installing holes on the switch contact support.
In order to make this device possess the function of selective earth leakage protective and earth leakage search/lockout simultaneously, adopted to change the line bag in the former feeding switch with tapped tripping coil winding.Be with tapped winding 0-1-2, (1 is centre tap); The 0-1 winding, the number of turn is few, and operating current is big, and electromagnetic actuation is fast, is used for choosing and leaks action; The 0-2 umber of turn is many, operating current is little, the electromagnet responsiveness is slow, but charged adhesive in the time of can growing, 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 realize the earth leakage search/lockout function, method is simple for this.This tripping coil adopts low voltage power supply in addition, so safe and reliable.
The artificial leak(age) test of this device is to adopt direct current relay node closure, the path on call through test resistance and ground, this relay winding one termination power, OK post in the one termination feedback electric switch explosion-proof chamber, as long as wire connection cavity OK post and the external explosion-proof button in ground are pushed this button and can be carried out artificial leak(age) test.
Claims (5)
1, a kind of mining low voltage electric network property selected earth leakage protective device; be connected with the branch road feeding switch; and form by power transformer, zero sequence current mutual inductor, the signal plate of obtaining residual voltage and direct voltage and earth leakage search/lockout signal, selective earth leakage protection and earth leakage search/lockout signal processing circuit plate, contact switching relay plate and to several parts of transformer of relay board power supply; it is characterized in that; on a base plate, this base plate then directly is packed in the fuse behind of feeding switch to this device with each component-assembled.
2, selective low-voltage leakage protector as claimed in claim 1 is characterized in that, residual voltage and direct voltage and earth leakage search/lockout sample of signal signal plate, zero sequence current mutual inductor adopt the resin embedding to become an integral body.
3, selective low-voltage leakage protector as claimed in claim 1 is characterized in that, the tripping coil in the said feeding switch, and for being provided with tapped 0-1-2 winding, 1 is centre tap.
4, selective low-voltage leakage protector as claimed in claim 1 is characterized in that, the distributing position of each parts on described base plate is: power transformer is in the upper right corner of described base plate; The relay board power transformer is in the lower right corner of described base plate; Residual voltage, direct voltage and earth leakage search/lockout sample of signal plate are arranged at the upper left side of described base plate; Zero sequence current mutual inductor is positioned at the top of described base plate and near the right side of above-mentioned sample of signal plate, selective earth leakage protection and earth leakage search/lockout signal processing circuit plate and contact switching relay plate then are contained on the base plate left end socket support.
5, selective low-voltage leakage protector as claimed in claim 1; it is characterized in that; a direct current relay is adopted in artificial leak(age) test; said relay winding one termination power; OK post in the one termination feeding switch explosion-proof chamber; by connecing an explosion-proof button between wire connection cavity OK post and the ground, this button links to each other with the earth polar simultaneously again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90217995 CN2073183U (en) | 1990-08-20 | 1990-08-20 | Low voltage electrified wire netting selective electricity leakage protector used in mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90217995 CN2073183U (en) | 1990-08-20 | 1990-08-20 | Low voltage electrified wire netting selective electricity leakage protector used in mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2073183U true CN2073183U (en) | 1991-03-13 |
Family
ID=4896887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90217995 Pending CN2073183U (en) | 1990-08-20 | 1990-08-20 | Low voltage electrified wire netting selective electricity leakage protector used in mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2073183U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389527C (en) * | 2005-09-27 | 2008-05-21 | 傅桂兴 | Earthing compensation process for mine low-voltage electricity grid selective leakage protection system |
-
1990
- 1990-08-20 CN CN 90217995 patent/CN2073183U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389527C (en) * | 2005-09-27 | 2008-05-21 | 傅桂兴 | Earthing compensation process for mine low-voltage electricity grid selective leakage protection system |
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