CN208508511U - Underground electrical equipment earth leakage protective device - Google Patents
Underground electrical equipment earth leakage protective device Download PDFInfo
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- CN208508511U CN208508511U CN201820917139.6U CN201820917139U CN208508511U CN 208508511 U CN208508511 U CN 208508511U CN 201820917139 U CN201820917139 U CN 201820917139U CN 208508511 U CN208508511 U CN 208508511U
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- electrical equipment
- current
- earth leakage
- leakage protective
- underground
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Abstract
The utility model relates to a kind of underground electrical equipment earth leakage protective devices, it includes zero sequence current mutual inductor, current probe, normally opened contact and relay, the zero sequence current mutual inductor is set to the three phase mains of the power device of underground electrical equipment, the zero sequence current mutual inductor is electrically connected the current probe, the current probe electric signal connects normally opened contact, the normally opened contact, wherein two-phase forming circuit in the three phase mains of relay series connection access underground electrical equipment, the relay electric signal is connected at the breaker of the three phase mains of underground electrical equipment.The utility model uses zero-sequenceprotection principle, leakage current is detected by current probe, and then pass through relay controller breaker actuation and alarm, to achieve the purpose that earth leakage protective and alarm；The current probe leakage current adjustable range used is big, efficiently avoids malfunctioning, keeps earth leakage protective safe and reliable.
Description
Technical field
The utility model relates to a kind of earth leakage protective device more particularly to a kind of underground electrical equipment earth leakage protective devices.
Background technique
Currently, it is usually present safety accident caused by the electric leakage of underground electrical equipment, and such as: caused by underground scraper is because of electric leakage
The person and equipment fault, seriously affect safety in production.Existing solution technical solution is to utilize leakage circuit breakers detection electric leakage electricity
Stream, due to leakage circuit breakers action current very little, and adjustable range is limited, malfunctions frequent occurrence, influences normally to produce order
Sequence.
Utility model content
In view of the deficiencies of the prior art, the utility model provides that a kind of leakage current adjustable range is big, prevents malfunction from sending out
Raw can reliably carry out earth leakage protective underground electrical equipment earth leakage protective device.
The technical scheme adopted by the utility model to solve the technical problem is as follows: the underground electrical equipment earth leakage protective dress
It sets including zero sequence current mutual inductor, current probe, normally opened contact and relay, the zero sequence current mutual inductor is set to underground electricity
The three phase mains of the power device of gas equipment, the zero sequence current mutual inductor are electrically connected the current probe, and the electric current is visited
It surveys device electric signal and connects normally opened contact, the normally opened contact, relay series connection access in the three phase mains of underground electrical equipment
Wherein two-phase is formed into a loop, and the relay electric signal is connected at the breaker of the three phase mains of underground electrical equipment.
It further include report in a kind of preferred embodiment of electrical equipment earth leakage protective device in underground provided by the utility model
Alarm device, the warning device are connected in parallel with relay.
In a kind of preferred embodiment of electrical equipment earth leakage protective device in underground provided by the utility model, the alarm
Device uses acoustic-optic alarm.
In a kind of preferred embodiment of electrical equipment earth leakage protective device in underground provided by the utility model, the electric current
Detector uses residual current type detector for electric fire protection.
In a kind of preferred embodiment of electrical equipment earth leakage protective device in underground provided by the utility model, the electric current
The current value setting range of detector is 0~9999mA.
Compared with prior art, the beneficial effect of electrical equipment earth leakage protective device in underground provided by the utility model is:
The utility model uses zero-sequenceprotection principle, detects leakage current by current probe, and then pass through relay controller
Breaker actuation is simultaneously alarmed, to achieve the purpose that earth leakage protective and alarm；The current probe leakage current tune used
Adjusting range is big, efficiently avoids malfunctioning, and keeps earth leakage protective safe and reliable.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the utility model
Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings
Obtain other attached drawings, in which:
Fig. 1 is the structural representation of a preferred embodiment of electrical equipment earth leakage protective device in underground provided by the utility model
Figure.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
All other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, the underground electrical equipment earth leakage protective device 1 includes zero sequence current mutual inductor 11, gallon
Device 12, normally opened contact 13 and relay 14, the zero sequence current mutual inductor 11 are set to the three of the power device of underground electrical equipment
Phase power supply, the zero sequence current mutual inductor 11 are electrically connected the current probe 12,12 electric signal of the current probe connection
Normally opened contact 13, the normally opened contact 13, the series connection of relay 14 access the wherein two-phase in the three phase mains of underground electrical equipment
Forming circuit, 14 electric signal of relay are connected at the breaker ZK1 of the three phase mains of underground electrical equipment.
Further, the earth leakage protective device 1 further includes warning device 15, and the warning device 15 and relay 14 are simultaneously
Connection connection.
Preferably, the warning device 15 uses acoustic-optic alarm.
Preferably, the current probe 12 uses residual current type detector for electric fire protection.
Specifically, the current value setting range of the current probe 12 is 0~9999mA.
Leakage Protective Rule: being based on Kirchhoff's current law (KCL), flows into the algebraical sum of the telegram in reply stream of any node in circuit
Equal to zero.Under route and the normal situation of electrical equipment, the vector sum of each phase current is equal to zero, therefore, zero sequence current mutual inductance
The secondary side winding no signal of device 11 exports, and 12 no current of current probe, normally opened contact 13 is failure to actuate；When generation ground fault
When the vector sum of each phase current be not zero, fault current makes to generate magnetic flux in the annular core of zero sequence current mutual inductor 11, zero
The secondary side inductive output current signal of sequence current transformer 11, when current probe 12 detects that signal is more than setting electric current I,
Normally opened electric shock closure, relay 14 must be electric, and then opens a sluice gate breaker ZK1 and alarm, and reaches earth-fault protection and alarm
Purpose.
The beneficial effect of electrical equipment earth leakage protective device in underground provided by the utility model is: the utility model uses zero
Sequence protection philosophy detects leakage current by current probe, and then passes through relay controller breaker actuation and alarm,
To achieve the purpose that earth leakage protective and alarm；The current probe leakage current adjustable range used is big, effectively keeps away
Malfunction is exempted from, has kept earth leakage protective safe and reliable.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Using equivalent structure or equivalent flow shift made by the utility model description, it is applied directly or indirectly in other phases
The technical field of pass similarly includes within the scope of patent protection of the utility model.
Claims (5)
1. a kind of underground electrical equipment earth leakage protective device, it is characterised in that: including zero sequence current mutual inductor, current probe,
Normally opened contact and relay, the zero sequence current mutual inductor is set to the three phase mains of the power device of underground electrical equipment, described
Zero sequence current mutual inductor is electrically connected the current probe, and the current probe electric signal connects normally opened contact, described normally opened
The wherein two-phase forming circuit in the three phase mains of underground electrical equipment, the relay telecommunications are accessed in contact, relay series connection
Number it is connected at the breaker of the three phase mains of underground electrical equipment.
2. electrical equipment earth leakage protective device in underground according to claim 1, it is characterised in that: it further include warning device,
The warning device is connected in parallel with relay.
3. electrical equipment earth leakage protective device in underground according to claim 2, it is characterised in that: the warning device uses
Acoustic-optic alarm.
4. electrical equipment earth leakage protective device in underground according to claim 1, it is characterised in that: the current probe is adopted
Use residual current type detector for electric fire protection.
5. electrical equipment earth leakage protective device in underground according to claim 4, it is characterised in that: the current probe
Current value setting range is 0~9999mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820917139.6U CN208508511U (en) | 2018-06-12 | 2018-06-12 | Underground electrical equipment earth leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820917139.6U CN208508511U (en) | 2018-06-12 | 2018-06-12 | Underground electrical equipment earth leakage protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208508511U true CN208508511U (en) | 2019-02-15 |
Family
ID=65286430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820917139.6U Active CN208508511U (en) | 2018-06-12 | 2018-06-12 | Underground electrical equipment earth leakage protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208508511U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112736846A (en) * | 2019-10-28 | 2021-04-30 | 株洲中车机电科技有限公司 | Integrated mutual inductor with leakage protection and zero sequence protection functions and application method |
-
2018
- 2018-06-12 CN CN201820917139.6U patent/CN208508511U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112736846A (en) * | 2019-10-28 | 2021-04-30 | 株洲中车机电科技有限公司 | Integrated mutual inductor with leakage protection and zero sequence protection functions and application method |
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