CN102798796A - Sensing and transmitting integrated device for monitoring grounding of transformer iron core - Google Patents

Sensing and transmitting integrated device for monitoring grounding of transformer iron core Download PDF

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Publication number
CN102798796A
CN102798796A CN2012102916653A CN201210291665A CN102798796A CN 102798796 A CN102798796 A CN 102798796A CN 2012102916653 A CN2012102916653 A CN 2012102916653A CN 201210291665 A CN201210291665 A CN 201210291665A CN 102798796 A CN102798796 A CN 102798796A
Authority
CN
China
Prior art keywords
sensing
iron core
modulate circuit
sensing coil
shield shell
Prior art date
Application number
CN2012102916653A
Other languages
Chinese (zh)
Inventor
王世有
Original Assignee
大连世有电力科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 大连世有电力科技有限公司 filed Critical 大连世有电力科技有限公司
Priority to CN2012102916653A priority Critical patent/CN102798796A/en
Publication of CN102798796A publication Critical patent/CN102798796A/en

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Abstract

The invention discloses a sensing and transmitting integrated device for monitoring grounding of a transformer iron core. The sensing and transmitting integrated device can prevent external electromagnetic interference, guarantee reliability of monitoring data and improve monitoring precision. The sensing and transmitting integrated device comprises a shielding casing, wherein a current transformer iron core is arranged in the shielding casing; a sensing coil on the current transformer iron core is connected with a conditioning circuit; the conditioning circuit is placed in the shielding casing and is positioned below the sensing coil; 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; insulating resin layers are arranged on the upper surface and the lower surface of the conditioning circuit; a waterproof aviation joint is arranged on the shielding casing positioned below the insulating resin layer; and the output of the conditioning circuit is connected with the waterproof aviation joint.

Description

The transformer core grounding monitor send integrated device with the sensing change
Technical field
The present invention relates to a kind of transformer core grounding monitoring device, the transformer core grounding monitor that especially a kind ofly prevent external electromagnetic interference, guarantee that Monitoring Data is reliable, improves monitoring accuracy becomes with sensing and send integrated device.
Background technology
Power transformer can produce electric field around the winding when normal operation, hardwares such as iron core, folder are in the electric field, in order to prevent to produce electric discharge phenomena, guarantee that insulation is reliable that iron core must have some reliable grounds.If another earth point on iron core, occurs; Will form the closed-loop path, wherein the magnetic flux of interlinkage will induce circulation in the loop, promptly on the lead-in wire of normal ground connection, produce circulation; Cause the iron core local overheating; To such an extent as to the iron core scaling loss occurs and produce discharge property 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 ground connection is that the power current mutual inductor is set; Sensing coil on the power current mutual inductor can with the ground current in the transformer core ground wire take out and transfer to convert into behind the modulate circuit corresponding normalized current signal (4 ~ 20mA), be transferred to CPU again and handle.Concrete structure is to be provided with shield shell, and the shield shell center section is feedthrough hole and is made up of two parts up and down, is provided with strong magnetic magnet in two-part junction up and down, to guarantee to have advantages of favorable electromagnetic shielding effect.In shield shell, be provided with the current transformer iron core, the sensing coil on the current transformer iron core joins through being arranged on shield shell outer concentric cable and modulate circuit, and the output and the CPU of modulate circuit join.Though; Existing monitoring device is simple in structure; But the milliampere level current signal that the transformer core of being monitored leaks need pass through long-distance transmissions and could pass through modulate circuit and carry out secondary treating, and the intermediate conveyor link not only can cause dropout, and the electromagnetic interference (EMI) in the external world also can cause signal fluctuation; Influence 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 present invention is in order to solve the above-mentioned technical matters of existing in prior technology, to provide a kind of and prevent external electromagnetic interference, guarantee that Monitoring Data is reliable, the transformer core grounding monitor of raising monitoring accuracy send integrated device with the sensing change.
Technical solution of the present invention is: a kind of transformer core grounding monitor send integrated device with the sensing change; Shield shell is arranged, in shield shell, be provided with the current transformer iron core, sensing coil and modulate circuit on the current transformer iron core join; Said modulate circuit places in the shield shell and is positioned at the below of sensing coil; Between sensing coil and modulate circuit, be provided with screen layer, screen layer is provided with coaxial fitting, and sensing coil joins through coaxial fitting and modulate circuit; Said modulate circuit top and bottom are equipped with insulating resin layer, are provided with the waterproof Aviation Connector on the shield shell below being positioned at insulating resin layer, and the output of modulate circuit and waterproof Aviation Connector are joined.
Also be provided with insulating resin layer between said shield shell and the current transformer iron core.
The present invention send sensing, change all to place in the housing; The screen layer between the two and the setting of insulating resin layer make shielding each other and insulation, can in housing, detect transformer iron core grounding current and convert the current signal of standard through modulate circuit into; Need not external lead wire entering processing of circuit center and carry 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 on-the-spot Installation and Debugging.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.
Embodiment
Below with accompanying drawings embodiment of the present invention.As shown in Figure 1: that the shield shell identical with prior art 1 arranged; In shield shell 1, be provided with current transformer unshakable in one's determination 2; Sensing coil 3 on the current transformer unshakable in one's determination 2 joins with modulate circuit 4; Different is with prior art: said 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, is provided with screen layer 5, screen layer 5 can with shield shell 1 integrative-structure; On screen layer 5, be provided with coaxial fitting 6, sensing coil 3 joins through coaxial fitting 6 and modulate circuit 4; Said modulate circuit 4 top and bottom are equipped with insulating resin layer 7, are provided with waterproof Aviation Connector 8 on the shield shell 1 below being positioned at insulating resin layer 7, 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 unshakable in one's determination 2, also be provided with insulating resin layer 7.

Claims (2)

1. a transformer core grounding monitor send integrated device with the sensing change; Shield shell (1) is arranged; In shield shell (1), be provided with current transformer iron core (2); Sensing coil (3) on the current transformer (2) unshakable in one's determination joins with modulate circuit (4), it is characterized in that: said 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), is provided with screen layer (5); Screen layer (5) is provided with coaxial fitting (6), and sensing coil (3) joins through coaxial fitting (6) and modulate circuit (4); Said modulate circuit (4) top and bottom are equipped with insulating resin layer (7), are provided with waterproof Aviation Connector (8) on the shield shell (1) below being positioned at insulating resin layer (7), and the output of modulate circuit (4) and waterproof Aviation Connector (8) are joined.
2. transformer core grounding monitor according to claim 1 send integrated device with the sensing change, it is characterized in that: said shield shell (1) and current transformer also are provided with insulating resin layer (7) between (2) unshakable in one's determination.
CN2012102916653A 2012-08-16 2012-08-16 Sensing and transmitting integrated device for monitoring grounding of transformer iron core CN102798796A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012102916653A CN102798796A (en) 2012-08-16 2012-08-16 Sensing and transmitting integrated device for monitoring grounding of transformer iron core

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012102916653A CN102798796A (en) 2012-08-16 2012-08-16 Sensing and transmitting integrated device for monitoring grounding of transformer iron core

Publications (1)

Publication Number Publication Date
CN102798796A true CN102798796A (en) 2012-11-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012102916653A CN102798796A (en) 2012-08-16 2012-08-16 Sensing and transmitting integrated device for monitoring grounding of transformer iron core

Country Status (1)

Country Link
CN (1) CN102798796A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08262063A (en) * 1995-03-24 1996-10-11 Kandenko Co Ltd Direct current sensor
CN201616342U (en) * 2009-12-08 2010-10-27 平高集团有限公司 Electronic type high-voltage current transformer
CN201654160U (en) * 2010-04-07 2010-11-24 北京光耀电力自动化有限公司 Transformer core grounding AC-DC on-line monitoring device
CN201966059U (en) * 2010-12-17 2011-09-07 福建阳谷智能技术有限公司 Current transformer with electronic tag, temperature acquisition and wireless communication functions
CN202794417U (en) * 2012-08-16 2013-03-13 大连世有电力科技有限公司 Sensing and transforming integrated device for transformer iron core grounding monitoring

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08262063A (en) * 1995-03-24 1996-10-11 Kandenko Co Ltd Direct current sensor
CN201616342U (en) * 2009-12-08 2010-10-27 平高集团有限公司 Electronic type high-voltage current transformer
CN201654160U (en) * 2010-04-07 2010-11-24 北京光耀电力自动化有限公司 Transformer core grounding AC-DC on-line monitoring device
CN201966059U (en) * 2010-12-17 2011-09-07 福建阳谷智能技术有限公司 Current transformer with electronic tag, temperature acquisition and wireless communication functions
CN202794417U (en) * 2012-08-16 2013-03-13 大连世有电力科技有限公司 Sensing and transforming integrated device for transformer iron core grounding monitoring

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Application publication date: 20121128

C02 Deemed withdrawal of patent application after publication (patent law 2001)