CN201450133U - Low-voltage grounding protection device - Google Patents
Low-voltage grounding protection device Download PDFInfo
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- CN201450133U CN201450133U CN2009200443945U CN200920044394U CN201450133U CN 201450133 U CN201450133 U CN 201450133U CN 2009200443945 U CN2009200443945 U CN 2009200443945U CN 200920044394 U CN200920044394 U CN 200920044394U CN 201450133 U CN201450133 U CN 201450133U
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Abstract
The utility model discloses a low-voltage grounding protection device. The low-voltage grounding protection device comprises five rubber sleeve flexible wires with electric clamps on the head ends, wherein, one is a grounding wire, one is a testing wire, and the other three are three-phase connecting wires; the tail ends of the five rubber sleeve flexible wires are electrically connected; and a warning device is connected in series on the testing wire, and comprises an amplitude limiting detector, a voltage regulator, an astable multivibrator, a 555 intervalometer and an audible and visual alarm which are electrically connected in sequence. The low-voltage grounding protection device can replace a common wire to achieve the short circuit grounding of a supply lead head of a low-voltage electromotor, thereby avoiding the damage of an electric cable, reducing the overhauling time, and securing personnel safety; electric shock accidents of the personnel caused by misoperation in the overhauling of a voltage transformer and a voltage quadric return circuit are eliminated; and the flashing warning device can intuitively remind a maintainer whether equipment to be overhauled is electrified through the audible and visual alarm, so as to avoid the unnecessary loss caused by the maintainer connecting the grounding wire to an electrified circuit.
Description
Technical field
The utility model relates to a kind of low pressure earth protective device; be applicable to the low-voltage equipment maintenance; and because of suddenly incoming call, equipment or the residual charge of circuit or the person that charge inducing causes, the occasion of equipment breakdown; be particularly useful for low voltage electrical equipment, voltage transformer, and the maintenance of voltage secondary circuit.
Background technology
During the high voltage electric equipment maintenance, one of technical measures of assurance safety are to hang earth connection, and purpose is that the residual charge on the electric equipment is leaked into the earth, when occurring sending a telegram here suddenly, can impel the rapid tripping of mains switch simultaneously.And earth connection can limit the rising of equipment voltage to earth when taking place to send a telegram here suddenly.But in some maintenance, can't where applicable owing to lack suitable short circuit ground connection or conventional earth connection, will cause very big threat to maintainer's personal safety.
Low-tension motor maintenance, for guaranteeing personal safety, generally with lead with the power supply the end of a thread pulled down hinged (or winding) and ground connection.When recovering, often cause power supply the end of a thread to fracture and again peeling make, limited in the allowance of the occasion power supply line length of some compact conformations, the cabling again in case the end of a thread just fractures causes very big waste; And in maintenance process, if the improper meeting of method that power line twines causes loose contact, in case misoperation can produce too early (equipment) and burn, same entail dangers to personal safety by short circuit current the time.
Be provided with the high voltage power distribution chamber of sectionalized bus, certain section bus secondary voltage circuit maintenance, the technical safety measures that " electrical safe working order " requires is to take off the voltage transformer secondary side fuse, but because two sections bus secondary voltage circuits can switch, this just might switch to voltage on the loop of maintenance by mistake and cause the staff to get an electric shock; Simultaneously, owing to take off behind the voltage transformer secondary side fuse and not obvious, might be by people's fuse of misdelivering, in case the misdelivery fuse will cause very big security risk to the maintainer.
When voltage transformer overhauled, the safety measure on first kind of work ticket of the power transformation of handling usually was requirement to the primary side of voltage transformer close earthing isolator or installing earth connection.And in maintenance process; tend to and to remove earth connection, so just make the maintainer who on voltage transformer circuit, works lose the short circuit ground protection, when secondary circuit generation misoperation; the primary side of voltage transformer just has anti-up voltage, jeopardizes maintainer's personal safety.
And also do not have at present a kind of special equipment that can well solve above-mentioned problem with grounding.
Summary of the invention
The purpose of this utility model is: the main weak point of not having special-purpose earth protective device when overhauling at above existing low-voltage equipment; a kind of low pressure earth protective device is proposed; when low voltage electrical equipment maintenance, voltage transformer maintenance or the maintenance of high voltage power distribution secondary voltage circuit; the any position that may send a telegram here of secondary side is checked and discharge; realize short circuit ground protection purpose, provide together safety curtain reliably to the maintainer.
In order to reach the above object: a kind of low pressure earth protective device of the utility model; its improvements are to form the cabtyre flexible wire that includes five charged folders of head end; wherein; one is that earth connection, one are p-wire; its excess-three root is the three-phase connecting line; the tail end of described five cabtyre flexible wires is electrically connected, and is in series with warning device on the described p-wire.
In order further to reach above purpose; the utility model low pressure earth protective device, further improvements are: described warning device is formed and is comprised clip detector, pressurizer, multivibrator, 555 timers, the audible-visual annunciator that is electrically connected successively.
Using method of the present utility model and principle are as follows: the electricity with earth connection presss from both sides reliable ground earlier; electricity folder with the p-wire of being with warning device connects repair apparatus again; identification equipment is charged not; if warning device alarm; devices illustrated is charged; operate again after then waiting to stop to handle; if warning device is failure to actuate; then can not have by affirmation equipment; then the electricity folder of three-phase connecting line is clamped the three-phase power line (or U, V, W of maintenance secondary circuit) that inserts motor respectively, promptly finished the ground protection effect.
The beneficial effects of the utility model are as follows: use this low pressure earth protective device can replace the power supply the end of a thread short circuit ground connection of plain conductor with low-tension motor, avoided cable bad, reduced the repair time, ensured personal safety; When voltage transformer maintenance and the maintenance of voltage secondary circuit, by the reliable short circuit ground connection of miniature earth connection, stopped personnel's electric shock accidents of causing owing to misoperation to the secondary circuit that overhauls, remedied the imperfection part of " electrical safe working order "; Whether its flashing alarm device can utilize sound and light alarm to remind maintainer's Awaiting Overhaul equipment also charged intuitively, to avoid the maintainer earth connection is connected to alive circuit and causes unnecessary loss; And novel structure of the present invention, make simply, easy to use, be worthy of popularization.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further described.
Fig. 1 is the utility model example structure schematic diagram.
Fig. 2 is the utility model embodiment warning device structured flowchart.
Embodiment
The low pressure earth protective device of present embodiment; as shown in Figure 1; its composition includes the cabtyre flexible wire of five charged folders 5 of head end; wherein; 1 is that earth connection, 2 is p-wire; its excess-three root 3-A, 3-B, 3-C are the three-phase connecting line, and the tail end of five cabtyre flexible wires is electrically connected, and is in series with warning device 4 on the p-wire 2.For the ease of distinguishing three-phase connecting line 3-A, 3-B, 3-C, in the present embodiment, it is yellow, green, red that the color of three-phase connecting line 3-A, 3-B, 3-C is respectively.
Before low-tension motor or voltage transformer secondary side maintenance, for avoiding overhauling the safety that the unexpected incoming call in position jeopardizes the person and equipment, earlier with the electric clamping connection of the earth connection of this low pressure earth protective device on ground network or ground connection band iron, using the crocodile clip (electricity folder) of p-wire to be taken up in order of priority then is connected with repair apparatus A, B, C three, if warning device sends sound and light alarm, illustrate that then there is electricity in this loop, operate again after waiting to stop to handle; If warning device is failure to actuate, illustrate that then this repair apparatus does not have, respectively the Huang of three-phase connecting line, green, red trichromatism crocodile clip (electricity folder) are clamped the three-phase power line (or secondary circuit U, V, W of maintenance) that inserts motor respectively then, can carry out reliable short circuit ground connection to any position that may send a telegram here of low voltage electrical equipment, carry out with the safety that guarantees service work.When removing earth connection, its order is just in time opposite.
Wherein, in the system of isolated neutral, earlier with the earth connection reliable ground, p-wire is connected on the secondary circuit neutral point N during use, identifies no electricity after, other three looks crocodile clip (the electric folder) is connected to U, V, W three-phase respectively.
In solidly earthed neutral system, earlier with the earth connection reliable ground, p-wire connects U, V, W three-phase respectively during use, after the identification three-phase does not really have electricity, again other three looks crocodile clip (electricity folder) is connected to U, V, W three-phase respectively.
As shown in Figure 2, the warning device of present embodiment is formed and is comprised the clip detector that is electrically connected successively, pressurizer, multivibrator, 555 timers, audible-visual annunciator, wherein, the job initiation voltage of multivibrator is in this example of 24V., the warning device utilization drives buzzer by multivibrator and light-emitting diode sends sound and light alarm. the p-wire of this device is connected in the Awaiting Overhaul loop, the voltage that is higher than 24V is arranged when test lead, multivibrator is just started working, export the square-wave signal that a series of frequencies are 1.2KHZ at output, thereby send sound and light alarm. whether the utility model utilizes this warning device to identify the Awaiting Overhaul loop charged.
In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation form, all drop on the protection range of the utility model requirement.
Claims (5)
1. low pressure earth protective device; it is characterized in that forming the cabtyre flexible wire that includes five charged folders of head end; wherein; one is that earth connection, one are p-wire; its excess-three root is the three-phase connecting line; the tail end of described five cabtyre flexible wires is electrically connected, and is in series with warning device on the described p-wire.
2. low pressure earth protective device according to claim 1 is characterized in that: described warning device is formed and is comprised clip detector, pressurizer, multivibrator, 555 timers, the audible-visual annunciator that is electrically connected successively.
3. low pressure earth protective device according to claim 1 is characterized in that: the color of described three-phase connecting line is respectively yellow, green, red.
4. low pressure earth protective device according to claim 3 is characterized in that: described electricity folder is crocodile clip.
5. low pressure earth protective device according to claim 4 is characterized in that: the job initiation voltage of described multivibrator is 24V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200443945U CN201450133U (en) | 2009-06-05 | 2009-06-05 | Low-voltage grounding protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200443945U CN201450133U (en) | 2009-06-05 | 2009-06-05 | Low-voltage grounding protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201450133U true CN201450133U (en) | 2010-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200443945U Expired - Fee Related CN201450133U (en) | 2009-06-05 | 2009-06-05 | Low-voltage grounding protection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN201450133U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107492A (en) * | 2013-02-25 | 2013-05-15 | 枣庄矿业（集团）有限责任公司柴里煤矿 | Human body protector for conditions that power on accidentally happens during mine maintenance after power cut |
| CN103487614A (en) * | 2013-10-18 | 2014-01-01 | 国家电网公司 | Secondary testing device of current transformer and assembly thereof |
| CN104062623A (en) * | 2014-07-03 | 2014-09-24 | 国家电网公司 | Low-voltage-side short circuit device for high-voltage electric transformer |
| CN105785106A (en) * | 2016-02-26 | 2016-07-20 | 国网天津市电力公司 | Grounding transformer low-voltage side live display |
| CN106018932A (en) * | 2016-06-01 | 2016-10-12 | 国网辽宁省电力有限公司葫芦岛供电公司 | Low voltage power interruption inspection grounding wire having acousto-optic alarming function |
| US10020623B1 (en) | 2017-03-15 | 2018-07-10 | Hughie Meehan | Electrical circuit jumper cable assembly for testing |
| US10135212B2 (en) | 2016-10-19 | 2018-11-20 | Hughie Meehan | Electric circuit jumper with coupling |
-
2009
- 2009-06-05 CN CN2009200443945U patent/CN201450133U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107492A (en) * | 2013-02-25 | 2013-05-15 | 枣庄矿业（集团）有限责任公司柴里煤矿 | Human body protector for conditions that power on accidentally happens during mine maintenance after power cut |
| CN103487614A (en) * | 2013-10-18 | 2014-01-01 | 国家电网公司 | Secondary testing device of current transformer and assembly thereof |
| CN103487614B (en) * | 2013-10-18 | 2016-08-24 | 国网冀北电力有限公司秦皇岛供电公司 | A kind of safe Current Transformer Secondary test device combination |
| CN104062623A (en) * | 2014-07-03 | 2014-09-24 | 国家电网公司 | Low-voltage-side short circuit device for high-voltage electric transformer |
| CN105785106A (en) * | 2016-02-26 | 2016-07-20 | 国网天津市电力公司 | Grounding transformer low-voltage side live display |
| CN106018932A (en) * | 2016-06-01 | 2016-10-12 | 国网辽宁省电力有限公司葫芦岛供电公司 | Low voltage power interruption inspection grounding wire having acousto-optic alarming function |
| US10135212B2 (en) | 2016-10-19 | 2018-11-20 | Hughie Meehan | Electric circuit jumper with coupling |
| US10020623B1 (en) | 2017-03-15 | 2018-07-10 | Hughie Meehan | Electrical circuit jumper cable assembly for testing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100505 Termination date: 20180605 |