CN203205825U - Flameproof long-distance short circuit protector - Google Patents
Flameproof long-distance short circuit protector Download PDFInfo
- Publication number
- CN203205825U CN203205825U CN 201320177008 CN201320177008U CN203205825U CN 203205825 U CN203205825 U CN 203205825U CN 201320177008 CN201320177008 CN 201320177008 CN 201320177008 U CN201320177008 U CN 201320177008U CN 203205825 U CN203205825 U CN 203205825U
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- China
- Prior art keywords
- protector
- power supply
- relay
- triode
- signal processing
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The flameproof long-distance short circuit protector belongs to the technical field of coal mine electric appliances and comprises a power supply unit and a signal processing unit. The protector is characterized in that three transformers are arranged at one side of a three-phase 127 V power supply in the power supply unit, a terminal of the protector is powered through a delta connection, secondary windings of the transformers provide a direct-current power supply after treatment of rectification and wave filtration, in the signal processing unit, an output end of a comparator is connected with a base of a triode, a collector of the triode is connected with a coil of a relay, one end of a normally closed contact of the relay is connected with the ground, the other end of the normally closed contact of the relay is connected with a three-phase power grid through resistances, a normally open contact is connected with an electrolytic capacitor with high capacity, and capacitance is connected with the power grid by resistors. The detection mode of the protector is that short circuit signals are converted into ground insulation resistance value signals which are then transmitted back to an initial end. The detection mode of the protector has nothing to do with the thickness of a cable. The protector has a maximum protection distance of 2000 m.
Description
Technical field
The utility model belongs to the colliery technical field of electric appliances, and relating to a kind of is the device that the long-distance illumination line short is protected under the coal mine.
Background technology
At present, under coal mine, often occur because the light conduits circuit is longer, and when cable end piece was short-circuited, lightning comprehensive protector can't detect the cable end piece short circuit, cause accident to occur.Therefore flame-proof type length is absolutely necessary apart from short-circuit protector.
Be that short-circuit signal is converted to electric leakage signal and the realization of like product is in the past all adopted, send into again top, can't differentiate leak current fault or short trouble like this.
Summary of the invention
The purpose of this utility model provide a kind of for flame-proof type length under the coal mine apart from short-circuit protector.
The utility model is achieved like this: flame-proof type length is apart from short-circuit protector, comprise power supply unit and signal processing unit, it is characterized in that power supply unit is at three-phase 127V mains side three transformers to be installed, be protector terminal power supply by delta connection, transformer secondary output provides DC power supply after rectification, filtering; Signal processing unit connects the triode ground level by comparator output terminal, the collector connecting relay coil of triode, relay normally closed contact one termination the earth, an end accesses three phase network by resistance, the relay normally open point connects big capacity electrolyte capacitor, and electric capacity is by resistance access electricity.
The utility model has the advantages that: the detection mode of short-circuit protection is that short-circuit signal is converted into insulation against ground resistance value signal, then passes top back.When terminal was short-circuited fault, the cable insulation against ground increased, and the illumination integrated protection that connects of accessory collects the variation of insulation against ground resistance with it, judges that cable end piece is short-circuited, and cut off the electricity supply and showed short trouble.
Protector of the present utility model is mainly used in the end of 127V illuminating line under the coal mine.
Description of drawings
Fig. 1 is the circuit connection diagram of the utility model embodiment protector.
Among the figure, transformer T1, T2, T3; Current rectifying and wave filtering circuit; Resistance: R1-R9; Capacitor C 1; Diode D1`-D5; Comparator U1; Triode Q1, relay J.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in detail.
Embodiment: the present embodiment flame-proof type length comprises power supply unit and signal processing unit apart from short-circuit protector as shown in Figure 1.Power supply unit is at three-phase 127V mains side three transformer T1 to be installed, T2, and T3 is the power supply of protector terminal by delta connection; Circuit Fault on Secondary Transformer output connects current rectifying and wave filtering circuit, and out-put supply VCC is as the protective circuit power supply.U1 is comparator, and U1 output connects transistor base.The coil of the collector connecting relay J of triode.The normally closed contact one termination the earth of relay J, the normally closed some other end passes through resistance R 7, R8, R9 accesses electrical network; The normal battle meets electrochemical capacitor C, and resistance R 4, R5, R6, diode etc.
The specific works principle of embodiment is as follows: under normal circumstances, comparator U1 output LOW voltage, electrical network connects the earth by resistance R 7-R9 behind the normally closed point of relay J.When cable was short-circuited fault, comparator U1 exported high level, drove triode Q1 conducting, and relay J gets electronic work.Normal opened contact is closed, and electric capacity discharges by relay tip, signal is provided for lightning comprehensive protector top, after top detects terminal signaling, cuts off the electricity supply immediately, shows simultaneously short trouble, has effectively protected illuminating line.
Protector detection mode of the present utility model is that short-circuit signal is converted into insulation against ground resistance value signal, then passes top back, and therefore irrelevant with the thickness of cable, maximum protecting distance can reach 2000 meters.
Claims (1)
1. a flame-proof type length is apart from short-circuit protector, comprise power supply unit and signal processing unit, it is characterized in that power supply unit is at three-phase 127V mains side three transformers to be installed, is the power supply of protector terminal by delta connection, and transformer secondary output provides DC power supply after rectification, filtering; Signal processing unit connects the triode ground level by comparator output terminal, the collector connecting relay coil of triode, relay normally closed contact one termination the earth, an end accesses three phase network by resistance, the relay normally open point connects big capacity electrolyte capacitor, and electric capacity accesses electrical network by resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320177008 CN203205825U (en) | 2013-04-10 | 2013-04-10 | Flameproof long-distance short circuit protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320177008 CN203205825U (en) | 2013-04-10 | 2013-04-10 | Flameproof long-distance short circuit protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203205825U true CN203205825U (en) | 2013-09-18 |
Family
ID=49149893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320177008 Expired - Fee Related CN203205825U (en) | 2013-04-10 | 2013-04-10 | Flameproof long-distance short circuit protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203205825U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199485A (en) * | 2013-04-10 | 2013-07-10 | 南京双京电器集团有限公司 | Explosion-proof type long distance short circuit protector |
-
2013
- 2013-04-10 CN CN 201320177008 patent/CN203205825U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199485A (en) * | 2013-04-10 | 2013-07-10 | 南京双京电器集团有限公司 | Explosion-proof type long distance short circuit protector |
| CN103199485B (en) * | 2013-04-10 | 2016-03-02 | 南京双京电器集团有限公司 | A kind of flame-proof type long distance short-circuit protector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20140410 |