CN2569409Y - Combined overvoltage protector - Google Patents
Combined overvoltage protector Download PDFInfo
- Publication number
- CN2569409Y CN2569409Y CN 02238530 CN02238530U CN2569409Y CN 2569409 Y CN2569409 Y CN 2569409Y CN 02238530 CN02238530 CN 02238530 CN 02238530 U CN02238530 U CN 02238530U CN 2569409 Y CN2569409 Y CN 2569409Y
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- protection
- electrically connected
- overvoltage
- neutral point
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Abstract
The utility model relates to a combined overvoltage protector which is special for a parallel capacitor bank. The utility model is composed of five protection units A, B, C, D, and Z, one end of the five protection units is electrically connected to form a neutral point M, the other end of the protection units A, B, C is respectively electrically connected with inlet wires of a three phase power supply of the parallel capacitor bank, the other end of the protection unit D is electrically connected with an earthing wire, and the other end of the protection unit Z is electrically connected with a neutral point O of a Y type connection capacitor bank. Thereby, overall overvoltage protection of phase to earth, phase to phase, neutral point to earth, and interelectrode protection of single capacitor can be realized.
Description
Affiliated technical field
The utility model relates to a kind of combination overvoltage protector of Shunt Capacitor Unit special use in the electric power network, more particularly, is a kind of 3-35kV of being used for three-phase power electrical network carries out overvoltage protection to Shunt Capacitor Unit composite set.
Technical background
The shunt capacitor compensation arrangement is widely used as electric power system power factor compensation and voltage adjustment, and Shunt Capacitor Unit generally all adopts the Y mode of connection in the 3-35kV neutral point non-direct grounding system.Protection to this class Shunt Capacitor Unit all is to adopt the protection of arrester scheme at present; lightning arrester is connected between each phase power inleting terminal and ground of Shunt Capacitor Unit; in case generation systems is overvoltage relatively, overvoltage absorbs by lightning arrester releases, thereby prevents the breakdown damage of capacitor.In order to prevent neutral point voltage drift, the neutral point lightning arrester of between Shunt Capacitor Unit neutral point and ground, connecting.This protection scheme only can be protected Shunt Capacitor Unit each relatively overvoltage and neutral point overvoltage to earth.And for the alternate overvoltage of Shunt Capacitor Unit and the interpolar overvoltage of single capacitor, because the protection value is the protection value sum of two lightning arresters, accumulated value is higher than the insulation tolerance between alternate and single the capacitor pole of capacitor group far away.So this protection scheme can not be protected phase insulation and single capacitor electrode insulation of Shunt Capacitor Unit, in case alternate or interpolar puncture, other all protections are all meaningless.In addition, the energy capacity of lightning arrester is less than normal, can't guarantee the insulation safety of capacitor.
Summary of the invention
In order to solve the weak point of above-mentioned protection scheme, the utility model provides a kind of novel combination overvoltage protector.It not only can protect Shunt Capacitor Unit each relatively overvoltage and neutral point overvoltage to earth, the alternate overvoltage that also can the reliably protecting Shunt Capacitor Unit and the interpolar overvoltage of single capacitor.Comprehensive and the reliability of protection improves greatly.
The technical scheme that the utility model adopted is: one five unit-combination type overvoltage protection device is set, is made up of A, B, C, D, five protected locations of Z respectively, an end of five protected locations suspension neutral point that is electrically connected to form; The other end of A, B, three unit of C is the lead terminal of each corresponding phase of three phase mains, is electrically connected with each power inleting terminal of shunt capacitor respectively; The other end of D unit is the ground lead terminal, is electrically connected with earth connection; The other end of Z unit is the lead terminal of Shunt Capacitor Unit neutral point.According to this design, alternate overvoltage is by A, B, three unit of C combined protection in twos; Overvoltage is by ground unit D and corresponding A, B, the protection of C unit combination mutually mutually; The interpolar overvoltage is by unit Z and corresponding A, B, the protection of C unit combination mutually; The neutral point overvoltage to earth is by cells D and unit Z combined protection.By five parameter designing and couplings that protected location is different, can realize to Shunt Capacitor Unit relatively, neutral point over the ground, relatively mutually and the overvoltage protection between single capacitor pole, thereby realize the comprehensive overvoltage protection of capacitor.So design, the alternate overvoltage of Shunt Capacitor Unit can reduce by 50% than former protection scheme, and the interpolar overvoltage of single capacitor reduces by 66% than former protection scheme.
The beneficial effects of the utility model are; can realize general protection to the overvoltage relatively of Shunt Capacitor Unit and the interpolar overvoltage of alternate overvoltage and single capacitor; thereby realize the reliably protecting to capacitor insulation safety, the accident spoilage of making significantly reduces.The utility model is simple in structure, realizes easily.
Description of drawings
The utility model will be further described below in conjunction with accompanying drawing.
Fig. 1, be the circuit theory diagrams of the utility model embodiment one.
Fig. 2, be the circuit theory diagrams of the utility model embodiment two.
A, B, C, D, Z are respectively five protected locations of combination overvoltage protector among the figure, and C1, C2, C3 are capacitor, and the O point is the neutral point of Y connection Shunt Capacitor Unit, and U, V, W are three phase mains.
Embodiment
In the embodiment shown in fig. 1; the end of five protected location A, B, C, D, Z is electrically connected; form suspension neutral point M; the other end of protected location A, B, C is electrically connected with the Shunt Capacitor Unit three phase mains respectively, the other end of protected location D is electrically connected with earth connection, and the other end of protected location Z is electrically connected with the neutral point O of Shunt Capacitor Unit.
In another embodiment shown in Figure 2; the end of protected location A, B, C, D is electrically connected, and forms suspension neutral point M, and protected location Z is directly replaced by a metallic conductor; one end of metallic conductor is electrically connected with suspension neutral point M, and the other end is electrically connected with the neutral point O of Shunt Capacitor Unit.
The utility model is simple in structure, realizes easily.
Claims (2)
1. combination overvoltage protector; it is characterized in that: A, B, C, D, five protected locations of Z are set; one end of five protected locations is electrically connected; the other end of protected location A, B, C is electrically connected with the three phase mains inlet wire of Shunt Capacitor Unit; the other end of protected location D is electrically connected with earth connection, and the other end of protected location Z is electrically connected with the neutral point O of the capacitor group of wye connection.
2. a kind of combination overvoltage protector according to claim 1 is characterized in that: the parameter of protected location Z is different with other four protected locations, can be conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02238530 CN2569409Y (en) | 2002-06-06 | 2002-06-06 | Combined overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02238530 CN2569409Y (en) | 2002-06-06 | 2002-06-06 | Combined overvoltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2569409Y true CN2569409Y (en) | 2003-08-27 |
Family
ID=33712200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02238530 Expired - Fee Related CN2569409Y (en) | 2002-06-06 | 2002-06-06 | Combined overvoltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2569409Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110865223A (en) * | 2019-11-18 | 2020-03-06 | 珠海许继电气有限公司 | Voltage acquisition compensation circuit |
| CN115343565A (en) * | 2022-10-19 | 2022-11-15 | 广东电网有限责任公司佛山供电局 | Method and device for evaluating health state of parallel capacitor in real time |
-
2002
- 2002-06-06 CN CN 02238530 patent/CN2569409Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110865223A (en) * | 2019-11-18 | 2020-03-06 | 珠海许继电气有限公司 | Voltage acquisition compensation circuit |
| CN115343565A (en) * | 2022-10-19 | 2022-11-15 | 广东电网有限责任公司佛山供电局 | Method and device for evaluating health state of parallel capacitor in real time |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Chu Qingxi Document name: Notification of Termination of Patent Right |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |