CN2336497Y - Four-branch combined overvoltage protector - Google Patents
Four-branch combined overvoltage protector Download PDFInfo
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- CN2336497Y CN2336497Y CN 98226098 CN98226098U CN2336497Y CN 2336497 Y CN2336497 Y CN 2336497Y CN 98226098 CN98226098 CN 98226098 CN 98226098 U CN98226098 U CN 98226098U CN 2336497 Y CN2336497 Y CN 2336497Y
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Abstract
The utility model relates to a four-branch combined overvoltage protector. An installation middle point O is radically connected with four protective branches, and the other end of each of the protective branches is respectively connected with phase wires A, B, C of protected equipment and an earth wire. The utility model is characterized in that protective devices arranged in each protective branch can be zinc-oxide nonlinear resistors, or part of the branches are connected in series with discharge gaps, or each branch is respectively connected in series with discharge gaps respectively connected with the resistors in parallel. The utility model can effectively reduce or eliminate the influence of stray capacity on the voltage distribution of a loop, so the protective overvoltage operating value trends to be stable.
Description
The utility model relates to over-pressure safety device.More particularly, be a kind of over-pressure safety device that is used for high-voltage electrical equipment.
Because the high voltage electric equipment, as transformer, switch and motor etc., not only insulation relatively has certain limit, and a little less than phase insulation also is highly brittle.Equate in order to make alternate protection overvoltage multiple cross electric multiple with protection relatively; avoid atmospheric over-voltage and switching overvoltage to cause the puncture of phase insulation and damage equipment; in the prior art; the simple Modular Three-Phase Overvoltage Protector of general employing; this protector becomes to penetrate shape and connects and respectively protect branch road from mid point O is set; the other end of protection branch road connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively, and each bar protection branch road of this protector all is to be made of discharging gap and the znr institute that is connected in series.But, in actual the use because under power-frequency voltage and surge voltage effect, electric current is very little before the discharge, again since the capacitance of discharging gap much smaller than the capacitance of znr; Therefore, voltage mainly is distributed on the discharging gap according to each discharging gap capacitance relative size between alternate or phase ground, and surrounding environment, all can greatly change the relative size of discharging gap capacitance such as the earth or aerial condutor, thereby the voltage in the change loop distributes, and then changes the size of overvoltage operating value.As seen, though this protection has solved the problem of equipment phase insulation to a certain extent,, as easy as rolling off a log generation malfunction or tripping cause bigger harm for whole using electricity system owing to protect the instability of overvoltage operating value.
The purpose of this utility model is to avoid above-mentioned weak point of the prior art, and a kind of four branch combinations formula overvoltage protectors with stable overvoltage operating value are provided, to guarantee the safe handling of power consumption equipment.
The purpose of this utility model is achieved through the following technical solutions:
The utility model becomes to penetrate four protection branch roads of shape connection from mid point O is set, and the other end of described four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively.Design feature of the present utility model is arranged on describedly respectively protects protection device in the branch road only for znr.
The purpose of this utility model also can be achieved through the following technical solutions:
The utility model becomes to penetrate four protection branch roads of shape connection from mid point O is set, and the other end of described four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively.Design feature of the present utility model be described four with the protection branch road of znr as protection device in, the part branch road discharging gap that is connected in series is arranged.
The purpose of this utility model can also be achieved through the following technical solutions:
The utility model becomes to penetrate four protection branch roads of shape connection from mid point O is set, and the other end of described four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively.Design feature of the present utility model be described four with the protection branch road of znr as protection device in, each branch road discharging gap that is connected in series respectively, and on described discharging gap parallel resistance respectively.
The utility model reduces the influence that stray capacitance distributes to loop voltage by the discharging gap in all or part of cancellation protection branch road.The utility model also can need the discharging gap of tandem compound discharge install parallel resistance additional by giving, and makes voltage in the loop by the resistance value size distribution, eliminates the influence that stray capacitance distributes to voltage.Thereby make protection overvoltage operating value tend towards stability.
Compared with the prior art, the utlity model has following advantage:
1, the utility model is effectively eliminated or is reduced stray capacitance to the influence that loop voltage distributes, and can choose and protect the overvoltage operating value accurately, and its dispersiveness on average can be controlled at below 2%; Therefore; needs according to system and protected equipment; can accurately design protection overvoltage operating value of the present utility model, avoiding temporary overvoltage and the lower switching overvoltage of part peak value that equipment can bear, and only under the higher switching overvoltage of atmospheric over-voltage and peak value, move.Eliminate malfunction and tripping phenomenon.Both protected equipment, the safety of self-operating is protected.
2, because no matter the superiority of zinc oxide nonlinear performance is to install parallel resistance additional, still cancel discharging gap, the utility model has all kept all advantages that former Modular Three-Phase Overvoltage Protector had.
Fig. 1 is the utility model embodiment 1 structural representation.
Fig. 2 is the utility model embodiment 2 structural representations.
Fig. 3 is the utility model embodiment 3 structural representations.
By the following examples, in conjunction with the accompanying drawings, the utility model is further described.
Embodiment 1:
Referring to accompanying drawing 1, present embodiment becomes to penetrate four protection branch roads of shape connection from mid point O is set, and the other end of four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively.In the present embodiment, be arranged on the protection device of respectively protecting in the branch road and only be znr FR1, FR2, FR3 and FR4.
Embodiment 2:
Referring to accompanying drawing 2, present embodiment is same to become to penetrate four protection branch roads of shape connection from mid point O is set, and the other end of four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively.With embodiment 1 different is present embodiment is four with znr FR1, FR2, FR3 and FR4 protection branch road as protection device in, the part branch road discharging gap that is connected in series is arranged.Shown in Figure 2, with the znr FR4 discharging gap g4 that is connected in series.
Embodiment 3:
Referring to accompanying drawing 3, present embodiment also is to become to penetrate four protection branch roads of shape connection from mid point O is set, and the other end of four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively.All different with the foregoing description 1, embodiment 2 is; present embodiment be described four with znr FR1, FR2, FR3 and FR4 protection branch road as protection device in; each branch road be connected in series respectively discharging gap g1, g2, g3 and g4, and on described discharging gap parallel resistance R1, R2, R3 and R4 respectively.
Parallel resistance R1 in the present embodiment, R2, R3 and R4 can be linear resistances, also can be nonlinear resistances.In concrete the enforcement, its nonlinear characteristic should be inferior to the znr of forming branch road.
Claims (5)
1, a kind of four branch combinations formula overvoltage protectors; from being set, mid point O becomes to penetrate four protection branch roads of shape connection; the other end of described four protection branch roads connects A phase line, B phase line, C phase line and the ground wire G of protected equipment respectively, it is characterized in that being arranged on describedly respectively protecting the protection device in the branch road only to be znr FR1, FR2, FR3 and FR4.
2, four branch combinations formula overvoltage protectors according to claim 1 is characterized in that be in the protection branch road of protection device at described four with znr FR1, FR2, FR3 and FR4, and the part branch road discharging gap that is connected in series is arranged.
3, four branch combinations formula overvoltage protectors according to claim 1; it is characterized in that be in the protection branch road of protection device at described four with znr FR1, FR2, FR3 and FR4; each branch road be connected in series respectively discharging gap g1, g2, g3 and g4, parallel resistance R1, R2, R3 and R4 respectively on described each discharging gap.
4, four branch combinations formula overvoltage protectors according to claim 3 is characterized in that the described resistance that is connected in parallel on the discharging gap is linear resistance.
5, four branch combinations formula overvoltage protectors according to claim 3 is characterized in that the described resistance that is connected in parallel on the discharging gap is nonlinear resistance, and its non-linear behaviour is inferior to the znr of forming branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98226098 CN2336497Y (en) | 1998-03-03 | 1998-03-03 | Four-branch combined overvoltage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98226098 CN2336497Y (en) | 1998-03-03 | 1998-03-03 | Four-branch combined overvoltage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2336497Y true CN2336497Y (en) | 1999-09-01 |
Family
ID=33976668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98226098 Expired - Fee Related CN2336497Y (en) | 1998-03-03 | 1998-03-03 | Four-branch combined overvoltage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2336497Y (en) |
-
1998
- 1998-03-03 CN CN 98226098 patent/CN2336497Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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 |