CN202794417U - Sensing and transforming integrated device for transformer iron core grounding monitoring - Google Patents
Sensing and transforming integrated device for transformer iron core grounding monitoring Download PDFInfo
- Publication number
- CN202794417U CN202794417U CN 201220406143 CN201220406143U CN202794417U CN 202794417 U CN202794417 U CN 202794417U CN 201220406143 CN201220406143 CN 201220406143 CN 201220406143 U CN201220406143 U CN 201220406143U CN 202794417 U CN202794417 U CN 202794417U
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- sensing coil
- iron core
- modulate circuit
- conditioning circuit
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Abstract
The present utility model discloses a sensing and transforming integrated device for transformer iron core grounding monitoring, and the device can be used for preventing external electromagnetic interferences and ensuring reliable monitoring data. The device is provided with a shielding shell body, a current transformer iron core is arranged inside the shielding shell body, a sensing coil of the current transformer iron core is connected with a conditioning circuit, the conditioning circuit is arranged below the sensing coil inside the shielding shell body, a shielding layer is arranged between the sensing coil and the conditioning circuit, a coaxial joint is arranged on the shielding layer, the sensing coil is connected with the conditioning circuit through the coaxial joint; insulation resin layer are arranged on upper and lower surfaces of the conditioning circuit, a waterproof aviation joint is arranged on the shielding shell body below the insulation shielding layers, and an output of the conditioning circuit is connected with the waterproof aviation joint.
Description
Technical field
The utility model relates to a kind of transformer core grounding monitoring device, and the transformer core grounding monitoring that especially a kind ofly prevent external electromagnetic interference, guarantee that Monitoring Data is reliable, improves monitoring accuracy becomes with sensing send integrated device.
Background technology
Power transformer can produce electric field around the winding when normal operation, the hardwares such as iron core, folder are in the electric field, in order to prevent electric discharge phenomena, guarantee that insulation is reliable that iron core must have some reliable grounds.If another earth point occurs at iron core, will form the closed-loop path, wherein the magnetic flux of interlinkage will induce circulation in the loop, namely the lead-in wire normal ground connection produces circulation, cause the iron core local overheating, to such an extent as to the iron core scaling loss occurs and produce discharging fault (multipoint earthing of iron core of transformer fault), therefore, accurately whether the ground connection of monitoring transformer core is reliable.At present, one of method of monitoring transformer core grounding is that the power current mutual inductor is set, sensing coil on the power current mutual inductor ground current in the transformer core grounding line can be taken out and transfer to be converted to behind the modulate circuit corresponding standard current signal (4 ~ 20mA), be transferred to again CPU and process.Concrete structure is to be provided with shield shell, and the shield shell center section is feedthrough hole and is made of two parts up and down, is provided with strong magnetic magnet in two-part junction up and down, to guarantee to have good effectiveness.Be provided with current transformer core in shield shell, the sensing coil on the current transformer core joins by being arranged on shield shell outer concentric cable and modulate circuit, and output and the CPU of modulate circuit join.Although, existing monitoring device is simple in structure, but the milliampere level current signal that the transformer core of monitoring leaks need to could pass through modulate circuit through long-distance transmissions and carry out secondary treating, the intermediate conveyor link not only can cause dropout, extraneous electromagnetic interference (EMI) also can cause signal fluctuation, affect the accuracy of image data, its net result has reduced the monitoring accuracy of system.Simultaneously, need the scene to carry out sensing and change and send etc. and to be connected debugging, waste time and energy, work efficiency is low.
Summary of the invention
The utility model is in order to solve the existing above-mentioned technical matters of prior art, to provide a kind of and prevent external electromagnetic interference, guarantee that Monitoring Data is reliable, the transformer core grounding monitoring of raising monitoring accuracy is sent integrated device with the sensing change.
Technical solution of the present utility model is: a kind of transformer core grounding monitoring becomes with sensing send integrated device, shield shell is arranged, in shield shell, be provided with current transformer core, sensing coil and modulate circuit on the current transformer core join, described modulate circuit places in the shield shell and is positioned at the below of sensing coil, be provided with screen layer between sensing coil and modulate circuit, screen layer is provided with coaxial fitting, and sensing coil joins by coaxial fitting and modulate circuit; Described modulate circuit top and bottom are equipped with insulating resin layer, and the shield shell below being positioned at insulating resin layer is provided with the waterproof Aviation Connector, and the output of modulate circuit and waterproof Aviation Connector are joined.
Also be provided with insulating resin layer between described shield shell and the current transformer core.
The utility model is that sensing, change are sent and all placed in the housing, screen layer between the two and the setting of insulating resin layer, so that mutually shielding and insulation, can in housing, detect transformer iron core grounding current and be converted to the current signal of standard through modulate circuit, need not external lead wire enters the processing of circuit center and carries out secondary treating, signal disturbs in dropout and the transmission course of cutting down the number of intermediate links, and guarantees that Monitoring Data is reliable, can improve the work efficiency of monitoring accuracy and site installation test.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model.As shown in Figure 1: shield shell same as the prior art 1 is arranged, in shield shell 1, be provided with current transformer core 2, sensing coil 3 on the current transformer core 2 joins with modulate circuit 4, with the prior art difference be: described modulate circuit 4 places in the shield shell 1 and is positioned at the below of sensing coil 3, between sensing coil 3 and modulate circuit 4, be provided with screen layer 5, screen layer 5 can with shield shell 1 integrative-structure, be provided with coaxial fitting 6 at screen layer 5, sensing coil 3 joins by coaxial fitting 6 and modulate circuit 4; Described modulate circuit 4 top and bottom are equipped with insulating resin layer 7, and the shield shell 1 below being positioned at insulating resin layer 7 is provided with waterproof Aviation Connector 8, and the output of modulate circuit 4 and waterproof Aviation Connector 8 are joined.In order further to improve dielectric strength, between shield shell 1 inwall and current transformer core 2, also be provided with insulating resin layer 7.
Claims (2)
1. a transformer core grounding monitoring is sent integrated device with the sensing change, shield shell (1) is arranged, in shield shell (1), be provided with current transformer core (2), sensing coil (3) on the current transformer core (2) joins with modulate circuit (4), it is characterized in that: described modulate circuit (4) places in the shield shell (1) and is positioned at the below of sensing coil (3), between sensing coil (3) and modulate circuit (4), be provided with screen layer (5), screen layer (5) is provided with coaxial fitting (6), and sensing coil (3) joins by coaxial fitting (6) and modulate circuit (4); Described modulate circuit (4) top and bottom are equipped with insulating resin layer (7), and the shield shell (1) below being positioned at insulating resin layer (7) is provided with waterproof Aviation Connector (8), and the output of modulate circuit (4) and waterproof Aviation Connector (8) are joined.
2. transformer core grounding monitoring according to claim 1 is sent integrated device with the sensing change, it is characterized in that: also be provided with insulating resin layer (7) between described shield shell (1) and the current transformer core (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220406143 CN202794417U (en) | 2012-08-16 | 2012-08-16 | Sensing and transforming integrated device for transformer iron core grounding monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220406143 CN202794417U (en) | 2012-08-16 | 2012-08-16 | Sensing and transforming integrated device for transformer iron core grounding monitoring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202794417U true CN202794417U (en) | 2013-03-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220406143 Expired - Lifetime CN202794417U (en) | 2012-08-16 | 2012-08-16 | Sensing and transforming integrated device for transformer iron core grounding monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202794417U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798796A (en) * | 2012-08-16 | 2012-11-28 | 大连世有电力科技有限公司 | Sensing and transmitting integrated device for monitoring grounding of transformer iron core |
| CN104569771A (en) * | 2015-01-29 | 2015-04-29 | 西安交通大学 | Primary-side insulation discharge pulse detector for oil-immersed current transformer |
| CN105277842A (en) * | 2015-11-27 | 2016-01-27 | 国网山东省电力公司济南供电公司 | Leakage electric current sensor for electrical device and leakage electric current signal extracting method |
-
2012
- 2012-08-16 CN CN 201220406143 patent/CN202794417U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798796A (en) * | 2012-08-16 | 2012-11-28 | 大连世有电力科技有限公司 | Sensing and transmitting integrated device for monitoring grounding of transformer iron core |
| CN104569771A (en) * | 2015-01-29 | 2015-04-29 | 西安交通大学 | Primary-side insulation discharge pulse detector for oil-immersed current transformer |
| CN105277842A (en) * | 2015-11-27 | 2016-01-27 | 国网山东省电力公司济南供电公司 | Leakage electric current sensor for electrical device and leakage electric current signal extracting method |
| CN105277842B (en) * | 2015-11-27 | 2018-06-12 | 国网山东省电力公司济南供电公司 | A kind of power equipment leakage current sensor and leakage current signal extracting method |
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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: 20130313 |