CN202712836U - Grounded-neutral system - Google Patents
Grounded-neutral system Download PDFInfo
- Publication number
- CN202712836U CN202712836U CN 201220271009 CN201220271009U CN202712836U CN 202712836 U CN202712836 U CN 202712836U CN 201220271009 CN201220271009 CN 201220271009 CN 201220271009 U CN201220271009 U CN 201220271009U CN 202712836 U CN202712836 U CN 202712836U
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- Prior art keywords
- nonlinear resistance
- current transformer
- relay
- neutral
- fuse
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Abstract
Disclosed is a grounded-neutral system, comprising a relay, a first non-linear resistor, a second non-linear resistor, a fuse, and a current transformer, wherein the series branch of the first non-linear resistor and the fuse is parallelly connected with the second non-linear resistor to form a parallel branch; one end of the parallel branch is connected with a neutral point via the normally closed contact of the relay while the other end of the parallel branch is grounded via the current transformer; and the coil of the relay is connected with the current transformer and is grounding. The grounded-neutral system of the utility model features simple structure and low overvoltage level and is capable of solving single-phase arc light grounding and other faults.
Description
Technical field
The utility model relates to a kind of earth neutral system.
Background technology
The neutral grounding mode of electric power system has many forms, but basically can be divided into two large classes: every circuit breaker that needs interdicts the single phase ground fault person, belongs to large current earthing mode; Every single-phase earthing electric arc can moment extinguisher voluntarily, belong to the small current neutral grounding mode.In large current earthing mode, mainly contain: neutral-point solid ground mode, resistance and low resistance grounding mode etc. in the neutral point warp.In the small current neutral grounding mode, mainly contain: neutral point resonance (through arc suppression coil) earthing mode, the isolated neutral mode, neutral point is through High Resistance Grounding Mode etc.These modes have deficiency separately, for example: direct ground connection and all relatively poor through power supply reliability and the fail safe of low resistance earthing, can not blow-out when single-phase arc grounding occurs; When single-phase earthing occured, overvoltage was very high through high resistance grounding, and the system that earthing capacitance current is larger is inadaptable; Large through the tuning difficulty of the precision of grounding through arc, the route selection accuracy rate is low, and cost is high.
Summary of the invention
The purpose of this utility model is to overcome the defective of prior art and a kind of earth neutral system is provided, and it is simple in structure, and overvoltage level is low, and can eliminate the faults such as single-phase arc grounding.
The technical scheme that realizes above-mentioned purpose is:
A kind of earth neutral system comprises relay, the first nonlinear resistance, the second nonlinear resistance, fuse summation current transformer, wherein:
The series arm of described the first nonlinear resistance and fuse formation one in parallel branch road in parallel with described the second nonlinear resistance, an end of this parallel branch connects neutral point by the normally-closed contact of described relay, and the other end is by described current transformer ground connection;
The coil of described relay connects described current transformer and ground connection.
Above-mentioned earth neutral system, wherein, the conducting voltage of described the second nonlinear resistance is greater than the conducting voltage of described the first nonlinear resistance.
The beneficial effects of the utility model are: the utility model is simple in structure, and overvoltage level is low, and can eliminate the faults such as single-phase arc grounding, has guaranteed the safety of power consumption equipment, thereby has improved reliability and the fail safe of electric power system.
Description of drawings
Fig. 1 is the structural representation of earth neutral system of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
See also Fig. 1, earth neutral system of the present utility model comprises relay, the first nonlinear resistance 2, the second nonlinear resistance 3, fuse 1 summation current transformer 4, wherein:
The series arm of the first nonlinear resistance 2 and fuse 1 and the second nonlinear resistance 3 formation one branch roads in parallel in parallel, an end of this parallel branch connects neutral point N by the normally-closed contact 6 of relay, and the other end is by current transformer 4 ground connection;
The coil 5 of relay connects current transformer 4 and ground connection;
The conducting voltage of the second nonlinear resistance 3 is greater than the conducting voltage of the first nonlinear resistance 2.
When normal operation, neutral point N voltage is very low, and the first nonlinear resistance 2 high-impedance states are equivalent to open circuit, and system is earth-free; When breaking down, when namely causing overvoltage, 2 conductings of the first nonlinear resistance, with limiting voltage in setting range; When the first nonlinear resistance 2 under extreme conditions, fuse 1 quick fuse so that the first nonlinear resistance 2 states out of service, this moment, the second nonlinear resistance 3 was used for replacing the first nonlinear resistance 2 protection systems and equipment; Current transformer 4 and relay energy real-time detecting system conduction status, and when the current signal of current transformer 4 collections reaches set point, the actuating of relay, the normally-closed contact 6 of relay is opened, and cuts off circuit.
Above embodiment is only for illustration of the utility model, but not to restriction of the present utility model, person skilled in the relevant technique, in the situation that do not break away from spirit and scope of the present utility model, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.
Claims (2)
1. an earth neutral system is characterized in that, comprises relay, the first nonlinear resistance, the second nonlinear resistance, fuse summation current transformer, wherein:
The series arm of described the first nonlinear resistance and fuse formation one in parallel branch road in parallel with described the second nonlinear resistance, an end of this parallel branch connects neutral point by the normally-closed contact of described relay, and the other end is by described current transformer ground connection;
The coil of described relay connects described current transformer and ground connection.
2. earth neutral system according to claim 1 is characterized in that, the conducting voltage of described the second nonlinear resistance is greater than the conducting voltage of described the first nonlinear resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220271009 CN202712836U (en) | 2012-06-08 | 2012-06-08 | Grounded-neutral system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220271009 CN202712836U (en) | 2012-06-08 | 2012-06-08 | Grounded-neutral system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202712836U true CN202712836U (en) | 2013-01-30 |
Family
ID=47593101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220271009 Expired - Lifetime CN202712836U (en) | 2012-06-08 | 2012-06-08 | Grounded-neutral system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202712836U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410058A (en) * | 2014-11-21 | 2015-03-11 | 国家电网公司 | 10000 volt power grid neutral point grounding device |
| CN104716624A (en) * | 2015-04-06 | 2015-06-17 | 铁岭市世纪电力设备有限公司 | Neutral-point grounding protection incorporate device |
| CN105048437A (en) * | 2015-09-03 | 2015-11-11 | 芜湖科越电气有限公司 | Combined neutral point grounding integrated control device |
-
2012
- 2012-06-08 CN CN 201220271009 patent/CN202712836U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104410058A (en) * | 2014-11-21 | 2015-03-11 | 国家电网公司 | 10000 volt power grid neutral point grounding device |
| CN104716624A (en) * | 2015-04-06 | 2015-06-17 | 铁岭市世纪电力设备有限公司 | Neutral-point grounding protection incorporate device |
| CN105048437A (en) * | 2015-09-03 | 2015-11-11 | 芜湖科越电气有限公司 | Combined neutral point grounding integrated control device |
| CN105048437B (en) * | 2015-09-03 | 2018-08-24 | 芜湖科越电气有限公司 | A kind of combined type neutral ground composite control apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130130 |