CN203119459U - Power transformer iron core grounding protection device - Google Patents
Power transformer iron core grounding protection device Download PDFInfo
- Publication number
- CN203119459U CN203119459U CN 201220731889 CN201220731889U CN203119459U CN 203119459 U CN203119459 U CN 203119459U CN 201220731889 CN201220731889 CN 201220731889 CN 201220731889 U CN201220731889 U CN 201220731889U CN 203119459 U CN203119459 U CN 203119459U
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- magnetic latching
- resistance
- resistor network
- current
- resistors
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Abstract
The utility model relates to a power transformer iron core grounding protection device. The power transformer iron core grounding protection device comprises a micro current converter, a central processor, a current limit resistor network set and magnetic latching relays, wherein a number of the magnetic latching relays is equal to a number of resistors in a current limit resistor network, all the resistors in the current limit resistor network are connected in series, two ends of each resistor of the (N-1) resistors are respectively connected with normally-closed contacts of one magnetic latching relay, and normally-closed contacts of another magnetic latching relay are connected with two ends of the current limit resistor network. According to the power transformer iron core grounding protection device, all the resistors are changed to be in series connection instead of in parallel connection, great effects are exerted. After series connection of the resistors, each resistor is controlled under the correspond magnetic latching relay and can stand power generated by corresponding fault current through different accumulation resistance values, power requirements during resistor selection can be greatly reduced, and service life of the resistors is further prolonged, and thereby manufacturing cost of products is reduced.
Description
Technical field
The utility model relates to a kind of electrical transformer cores earth protective device.
Background technology
For avoiding transformer to be subjected to multiple factor affecting, 2 or multipoint earthing phenomenon can appear in iron core or other hardwares, consequent earth current causes that the transformer part is overheated, oil decomposition and decreasing insulating, when serious, also can cause ground strip fusing or burn out hardware, the iron core equipotential is suspended and produce discharge, thereby make transformer can not continue operation, even cause the problem of damaging the transformer major accident, have the multiple technologies solution in the prior art.One of them is to insert a protective device at the transformer core earth connection, and this protective device comprises miniature power pack, central processing unit, one group of current-limiting resistor network and many magnetic latching relays.During work, central processing unit judges according to the current signal size, utilizes the resistance of resistance in the current-limiting resistor network, makes within the scope that the earth current of hardware such as iron core is limited in stipulating all the time, thereby realize monitoring and current limliting purpose in real time, guarantee the safe operation of power transformer.
But there are the following problems in actual applications for said apparatus: many resistance in the current-limiting resistor network and iron core adopt parallel-connection structure, fault current is more big, current-limiting resistance also must increase thereupon, need on the contrary to reduce incorporating resistance in circuit quantity into, each resistance bears the power that fault current produces separately, makes each resistance that higher rated power need be arranged, therefore, cost of goods manufactured height not only, but also influence useful life.
Summary of the invention
For solving the problems of the technologies described above; the utility model aims to provide a kind of electrical transformer cores earth protective device with new structure; this device is being realized on monitoring in real time and the current limliting purpose basis; have that the requirement of selected resistance rated power is low, the advantage of long service life and stable work in work, be conducive to reduce the manufacturing cost of product.
For solving the problems of the technologies described above, the utility model has adopted following technical proposals, the structure of this electrical transformer cores earth protective device, comprise miniature power pack, central processing unit, one group of current-limiting resistor network and magnetic latching relay, the quantity of described magnetic latching relay equates with resistance quantity in the described current-limiting resistor network, it is characterized in that: all resistance in the described current-limiting resistor network are and are connected in series, and wherein the two ends of every resistance are connected with the normally-closed contact of a magnetic latching relay respectively in N-1 resistance; The normally-closed contact of another magnetic latching relay is connected the two ends of this current-limiting resistor network.
During as preferred concrete enforcement, described current-limiting resistor network is made of R1, R2, R3, R4 and five resistance of R5 and KM1, KM2, KM3, KM4 and five magnetic latching relays of KM5, wherein, R2, R3, R4 and R5 are in parallel with KM2, KM3, KM4 and KM5 respectively successively, and the normally-closed contact of magnetic latching relay KM1 is connected the two ends of this current-limiting resistor network series resistance.
During as preferred concrete enforcement, the resistance of described R1, R2, R3, R4 and five resistance of R5 is followed successively by 100 Ω, 100 Ω, 200 Ω, 400 Ω and 800 Ω.
Beneficial effect: compared with prior art, the utility model has been obtained good effect after only changing all resistance in the current-limiting resistor network into series connection by parallel connection.After the resistance series connection, every resistance is under corresponding magnetic latching relay control, can remove to bear the power that corresponding fault current is produced with different stack resistances, thereby when selecting resistance, not only its power requirement can reduce greatly, but also prolonged useful life of resistance, and then reduced the manufacturing cost of product.
Description of drawings
Fig. 1 is the electrical block diagram of an embodiment of the utility model
Among the figure: transformer 1, transformer core 2, binding post 3, miniature power pack 4, central processing unit 5, coil 6.
Embodiment
This protective device contains folder by transformer core 2(); binding post 3, miniature power pack 4, central processing unit 5(PIC16F887A); one group of current-limiting resistor network and magnetic latching relay, the quantity of described magnetic latching relay equates with resistance quantity in the described current-limiting resistor network.All resistance in the described current-limiting resistor network are and are connected in series, and wherein the two ends of every resistance are connected with the normally-closed contact of a magnetic latching relay respectively in N-1 resistance; The normally-closed contact of another magnetic latching relay is connected the two ends of this current-limiting resistor network.
Referring to Fig. 1.During concrete enforcement, described current-limiting resistor network is made of R1, R2, R3, R4 and five resistance of R5 and KM1, KM2, KM3, KM4 and five magnetic latching relays of KM5, wherein, R2, R3, R4 and R5 are in parallel with KM2, KM3, KM4 and KM5 respectively successively, and the normally-closed contact of magnetic latching relay KM1 is connected the two ends of this current-limiting resistor network series resistance.Five resistance can adopt high-power aluminum hull noninductive resistance, and the resistance of R1, R2, R3, R4 and five resistance of R5 is followed successively by 100 Ω, 100 Ω, 200 Ω, 400 Ω and 800 Ω.Certainly, resistance quantity and resistance thereof can be selected as required.
Operation principle is as follows: when central processing unit 5 obtains the electric current of miniature power pack 4 outputs greater than 0.1A(transformer grounding electric current peak) time, KM1 must conduct, with R1(100 Ω) put into operation.After R1 put into operation, during as earth fault current or greater than 0.1A, then central processing unit 5 must conduct KM2; KM2 opens, with R2(100 Ω) also put into operation, and the like; until protective device fault current is limited in below the 0.1A, to guarantee the normal operation of power transformer.
Present embodiment only is explanation technology contents of the present utility model, and should not limit protection range of the present utility model, and any simple deformation design of making according to present embodiment all should be included protection range of the present utility model in.
Claims (3)
1. electrical transformer cores earth protective device, comprise miniature power pack (4), central processing unit (5), one group of current-limiting resistor network and magnetic latching relay, the quantity of described magnetic latching relay equates with resistance quantity in the described current-limiting resistor network, it is characterized in that: all resistance in the described current-limiting resistor network are and are connected in series, and wherein the two ends of every resistance are connected with the normally-closed contact of a magnetic latching relay respectively in N-1 resistance; The normally-closed contact of another magnetic latching relay is connected the two ends of this current-limiting resistor network.
2. protective device as claimed in claim 1; it is characterized in that: described current-limiting resistor network is made of R1, R2, R3, R4 and five resistance of R5 and KM1, KM2, KM3, KM4 and five magnetic latching relays of KM5; wherein; R2, R3, R4 and R5 are in parallel with KM2, KM3, KM4 and KM5 respectively successively, and the normally-closed contact of magnetic latching relay KM1 is connected the two ends of this current-limiting resistor network series resistance.
3. protective device as claimed in claim 2, it is characterized in that: the resistance of described R1, R2, R3, R4 and five resistance of R5 is followed successively by 100 Ω, 100 Ω, 200 Ω, 400 Ω and 800 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220731889 CN203119459U (en) | 2012-12-27 | 2012-12-27 | Power transformer iron core grounding protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220731889 CN203119459U (en) | 2012-12-27 | 2012-12-27 | Power transformer iron core grounding protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203119459U true CN203119459U (en) | 2013-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220731889 Expired - Fee Related CN203119459U (en) | 2012-12-27 | 2012-12-27 | Power transformer iron core grounding protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203119459U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207173A (en) * | 2014-05-29 | 2015-12-30 | 国网山西省电力公司电力科学研究院 | Device and method for monitoring, controlling and eliminating multipoint grounding of high-capacity transformer |
-
2012
- 2012-12-27 CN CN 201220731889 patent/CN203119459U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207173A (en) * | 2014-05-29 | 2015-12-30 | 国网山西省电力公司电力科学研究院 | Device and method for monitoring, controlling and eliminating multipoint grounding of high-capacity transformer |
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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 |
Granted publication date: 20130807 Termination date: 20151227 |
|
| EXPY | Termination of patent right or utility model |