CN109036822A - A kind of assembly technology of outdoor open-close type current transformer - Google Patents

A kind of assembly technology of outdoor open-close type current transformer Download PDF

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Publication number
CN109036822A
CN109036822A CN201810775748.7A CN201810775748A CN109036822A CN 109036822 A CN109036822 A CN 109036822A CN 201810775748 A CN201810775748 A CN 201810775748A CN 109036822 A CN109036822 A CN 109036822A
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CN
China
Prior art keywords
sealing
core shell
seal
side cover
core
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN201810775748.7A
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Chinese (zh)
Inventor
徐振德
蒋大维
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangyin Spark Electronic Technology Co Ltd
Original Assignee
Jiangyin Spark Electronic Technology Co Ltd
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 Jiangyin Spark Electronic Technology Co Ltd filed Critical Jiangyin Spark Electronic Technology Co Ltd
Priority to CN201810775748.7A priority Critical patent/CN109036822A/en
Publication of CN109036822A publication Critical patent/CN109036822A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00Details of transformers or inductances, in general
    • H01F27/02Casings
    • H01F27/022Encapsulation
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20Instruments transformers
    • H01F38/22Instruments transformers for single phase ac
    • H01F38/28Current transformers
    • H01F38/30Constructions
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/005Impregnating or encapsulating

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

A kind of assembly technology of outdoor open-close type current transformer of the present invention, the technique includes following steps: Step 1: the upper half is assembled;Step 2: lower half is assembled;Step 3: the upper half is connected with lower half by snap component (501);At this time the bottom of upper core shell (102) install in constituted on lower seal (205) first sealing, sealing inserted sheet (206.3), which is inserted in sealing slot (105.1), constitutes second sealing, and upper seal (105), which is installed, constitutes three seals in the top of lower case (206).A kind of assembly technology of outdoor open-close type current transformer of the present invention, assembly efficiency is high and sealing effect is good.

Description

A kind of assembly technology of outdoor open-close type current transformer
Technical field
The present invention relates to a kind of assembly technologies, more particularly, to a kind of current transformer for outdoor retractable structure Assembly technology.
Background technique
Current transformer, for the current information of primary system to be accurately transfer to secondary side relevant device;It will be primary The high voltage of system, high current are transformed to the low-voltage (standard value) of secondary side, low current (standard value), make measurement, gauge The standardization of the devices such as table and relay, miniaturization, and reduce the insulating requirements to secondary device;By secondary side apparatus and two Subsystem is well isolated from primary system high-tension apparatus in electrical aspect, to ensure that the safety of secondary device and the person;
Such as " a kind of outdoor current transformer " that Chinese patent 201110161672.7 is declared, height is effectively realized The electrical isolation of voltage, but such equipment does not use folding form, needs to be pre-installed at route installation initial stage, or Route is transformed after power failure, undoubtedly affects its use;For this purpose, there is Chinese 201610006999.X to disclose " in one kind Press outdoor open-close type current transformer ", use retractable structure to be easily installed and use, but actual production and use process The mutual inductor assembly efficiency of middle discovery, this kind of structure is low, and sealing effect is bad after assembly, for a long time after outdoor use, holds Yi Yin infiltration leads to short circuit or poor contact into dirt, to influence its service life.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings and to provide the outdoor foldings that a kind of assembly efficiency is high and sealing effect is good The assembly technology of formula current transformer.
The object of the present invention is achieved like this:
A kind of assembly technology of outdoor open-close type current transformer, the technique includes following steps:
Step 1: the upper half is assembled:
Upper core is fit into upper core shell by step 1.1;
Coil is wrapped on upper core shell by step 1.2;
Upper seal is set on upper sealing baffle by step 1.3;
Upper core shell is installed in upper housing by step 1.4, by the upper seal of upper core shell along upper card in installation process Slot is embedded in upper housing;
Step 1.5 is connected after the lead-out wire of coil to be passed through to upper housing with connecting terminal;
Connecting terminal is installed on upper housing by step 1.6;
Upper side cover is placed on upper housing by step 1.7, and the sealing strip of the upper protrusion of upper side cover is inserted in upper housing In upper seal groove;
Seam crossing between step 1.8, upper housing and upper side cover is coated with sealant;
The intracavitary carry out sealant pouring and sealing of shell that step 1.9, upper housing and upper side cover are constituted;
Step 2: lower half is assembled:
Elastic component is placed in lower core shell by step 2.1;
Lower core is fit into lower core shell by step 2.2, and elastic component is located at bottom and the lower core shell of lower core Between;
Lower seal is set on lower sealing baffle by step 2.3;
Lower core shell is installed in lower case by step 2.4, by the lower seal of lower core shell along lower card in installation process Slot is embedded in lower case;
Lower side cover is placed in lower case by step 2.5, and the sealing strip of the upper protrusion of lower side cover is inserted in lower case In lower seal groove cavity;
Seam crossing between step 2.6, lower case and lower side cover is coated with sealant;
Step 3: the upper half is connected with lower half by snap component;The bottom of upper core shell installs close under at this time First of sealing is constituted in seal, sealing inserted sheet, which is inserted in sealing slot, constitutes second sealing, and upper seal installs under The top of shell constitutes three seals.
A kind of assembly technology of outdoor open-close type current transformer of the present invention, the mutual inductor includes to pass through snap component The upper half and lower half of connection;
The upper half includes to be installed on positioned at the intracorporal upper core of upper casing, and in the upper core of inverted " U " shape structure In upper core shell, the top of the upper core shell is arranged two coil baffles and constitutes bobbin, and coil is wound in two coil gears It between piece, is provided at two open ends of upper core shell on circle and seals baffle, be set with sealing on sealing baffle on this It encloses, is provided with sealing slot on the end face of the upper seal;Card slot, above-mentioned upper seal are provided on the inner wall of upper housing On this in card slot;
The lower half includes positioned at the intracorporal lower core of lower casing, and the lower core of "u"-shaped is installed on lower core In shell, it is provided with elastic component between the lower core and lower core shell, is provided at two open ends of the lower core shell Lower sealing baffle is set with lower seal on the lower sealing baffle, is provided with lower bayonet slot on the inner wall of the lower core shell, on Lower seal is stated in the lower bayonet slot, is provided with the close of a ring structure at the top of two open ends of the lower core shell Inserted sheet is sealed, and seals the circumferential periphery that inserted sheet is set to lower core;
Behind the upper half and lower half pairing, the bottom of above-mentioned upper core shell installs close in constituting first in lower seal Envelope, sealing inserted sheet, which is inserted in sealing slot, constitutes second sealing, and upper seal, which is installed, constitutes third in the top of lower case Road sealing.
A kind of assembly technology of outdoor open-close type current transformer of the present invention is arranged on the side joint face of the upper housing There is upper seal groove, and upside covers the sealing strip for being provided with and being inserted on this in seal groove;What the upper housing and upper side cover were constituted The intracavitary sealant pouring and sealing of shell;Lower seal groove cavity is provided on the side joint face of the lower case, downside covers to be provided with and be inserted under this The intracavitary sealant pouring and sealing of shell that sealing strip in seal groove, the lower case and lower side cover are constituted.
A kind of assembly technology of outdoor open-close type current transformer of the present invention, the elastic component are pagoda spring.
Compared with prior art, the beneficial effects of the present invention are:
The present invention is made up of the upper half and lower half, and in entire assembling process by the way of being clamped grafting, so that Assembly efficiency is high;And quickly clamping is realized by snap component between the upper half and lower half, it is extremely convenient to install and use;Together When, three seal structures are realized after the upper half and lower half clamping, to realize high sealing effect, are conducive to outdoor water-proof Dust-proof use greatly improves its service life.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of outdoor open-close type current transformer of the present invention.
Fig. 2 be a kind of outdoor open-close type current transformer of the present invention upper core and upper core shell and lower core and under Assembly effect diagram between iron core shell.
Fig. 3 be a kind of outdoor open-close type current transformer of the present invention upper core and upper core shell and lower core and under The effect diagram that iron core shell assembles.
Fig. 4 be a kind of outdoor open-close type current transformer of the present invention upper core and upper core shell and lower core and under Cross-sectional view after the assembly of iron core shell.
Fig. 5 be a kind of outdoor open-close type current transformer of the present invention upper core and upper core shell wound around coil after and Assembling schematic diagram between lower core and lower core shell.
Fig. 6 is a kind of upper seal of outdoor open-close type current transformer of the present invention, the signal of the assembly effect of lower seal Figure.
Fig. 7 is the effect after a kind of upper seal of outdoor open-close type current transformer of the present invention, the assembling of lower seal Fruit schematic diagram.
Fig. 8 is a kind of upper housing of outdoor open-close type current transformer of the present invention and the assembly effect diagram of lower case.
The upper housing and the effect signal after lower case assembly that Fig. 9 is a kind of outdoor open-close type current transformer of the present invention Figure.
Figure 10 is that a kind of connecting terminal of outdoor open-close type current transformer of the present invention assembles effect diagram.
Figure 11 is the effect diagram after a kind of connecting terminal assembly of outdoor open-close type current transformer of the present invention.
Figure 12 and Figure 13 is the effect signal after a kind of assembly snap component of outdoor open-close type current transformer of the present invention Figure.
Figure 14 is a kind of upper side cover of outdoor open-close type current transformer of the present invention and the effect diagram of lower side cover.
Wherein:
Upper core 101, upper core shell 102, coil baffle 103, upper sealing baffle 104, upper seal 105, upper housing 106, upper side cover 107;
Seal slot 105.1;
Upper seal groove 106.1, upper card slot 106.2;
Lower core 201, lower core shell 202, elastic component 203, lower sealing baffle 204, lower seal 205, lower case 206, Lower side cover 207;
Lower seal groove cavity 206.1, lower bayonet slot 206.2, sealing inserted sheet 206.3;
Coil 301;
Connecting terminal 401;
Snap component 501.
Specific embodiment
Referring to Fig. 1~14, a kind of assembly technology of outdoor open-close type current transformer of the present invention, the technique packet Contain following steps:
Step 1: the upper half is assembled:
Upper core 101 is fit into upper core shell 102 by step 1.1;
Coil 301 is wrapped on upper core shell 102 by step 1.2;
Upper seal 105 is set on upper sealing baffle 104 by step 1.3;
Upper core shell 102 is installed in upper housing 106 by step 1.4, by the upper close of upper core shell 102 in installation process Seal 105 is along upper card slot 106.2 insertion upper housing 106;
Step 1.5 is connected after the lead-out wire of coil 301 to be passed through to upper housing 106 with connecting terminal 401;
Connecting terminal 401 is installed on upper housing 106 by step 1.6;
Upper side cover 107 is placed on upper housing 106 by step 1.7, and the sealing strip of the upper protrusion of upper side cover 107 is planted In in the upper seal groove 106.1 of upper housing 106;
Seam crossing between step 1.8, upper housing 106 and upper side cover 107 is coated with sealant;
The intracavitary carry out sealant pouring and sealing of shell that step 1.9, upper housing 106 and upper side cover 107 are constituted;
Step 2: lower half is assembled:
Elastic component 203 is placed in lower core shell 202 by step 2.1;
Lower core 201 is fit into lower core shell 202 by step 2.2, and elastic component 203 is located at the bottom of lower core 201 Between portion and lower core shell 202;
Lower seal 205 is set on lower sealing baffle 204 by step 2.3;
Lower core shell 202 is installed in lower case 206 by step 2.4, will be close under lower core shell 202 in installation process Seal 205 is embedded in lower case 206 along lower bayonet slot 206.2;
Lower side cover 207 is placed in lower case 206 by step 2.5, and the sealing strip of the upper protrusion of lower side cover 207 is planted In in the lower seal groove cavity 206.1 of lower case 206;
Seam crossing between step 2.6, lower case 206 and lower side cover 207 is coated with sealant;
Step 3: the upper half is connected with lower half by snap component 501;The bottom of upper core shell 102 installs at this time In constituting first of sealing in lower seal 205, it is close that sealing inserted sheet 206.3 is inserted in composition second in sealing slot 105.1 Envelope, upper seal 105, which is installed, constitutes three seals in the top of lower case 206;
The present invention relates to a kind of outdoor open-close type current transformer, the mutual inductor includes to be connected by snap component 501 The upper half and lower half connect;
The upper half includes the upper core 101 in upper housing 106, and is in the upper core of inverted " U " shape structure 101 are installed in upper core shell 102, and the top of the upper core shell 102 is arranged two coil baffles 103 and constitutes bobbin, line Circle 301 is wound between two coil baffles 103, is provided on circle at two open ends of upper core shell 102 and is sealed baffle 104, it is set with upper seal 105 on sealing baffle 104 on this, is provided with sealing slot on the end face of the upper seal 105 105.1;Card slot 106.2 is provided on the inner wall of upper housing 106, above-mentioned upper seal 105 is embedded at card slot 106.2 on this It is interior;It is provided with seal groove 106.1 on the side joint face of the upper housing 106, and is provided with and is inserted on this on upper side cover 107 Sealing strip in seal groove 106.1;The intracavitary sealant pouring and sealing of shell that the upper housing 106 and upper side cover 107 are constituted;
The lower half includes the lower core 201 in lower case 206, and the lower core 201 of "u"-shaped is installed In in lower core shell 202, being provided with elastic component 203, the lower core shell 202 between the lower core 201 and lower core shell 202 Two open ends at be provided with lower sealing baffle 204, be set with lower seal 205 on the lower sealing baffle 204, it is described Lower bayonet slot 206.2 is provided on the inner wall of lower core shell 202, above-mentioned lower seal 205 is in the lower bayonet slot 206.2, institute The sealing inserted sheet 206.3 for being provided with a ring structure at the top of two open ends of lower core shell 202 is stated, and seals inserted sheet 206.3 are set to the circumferential periphery of lower core 201;Lower seal groove cavity is provided on the side joint face of the lower case 206 206.1, the sealing strip being inserted into the lower seal groove cavity 206.1, the lower case 206 and lower side cover 207 are provided on lower side cover 207 The intracavitary sealant pouring and sealing of the shell of interior composition;
Behind the upper half and lower half pairing, the bottom of above-mentioned upper core shell 102 is installed in constituting first in lower seal 205 Road sealing, sealing inserted sheet 206.3, which is inserted in sealing slot 105.1, constitutes second sealing, and upper seal 105 is installed in lower casing The top of body 206 constitutes three seals;
Further, the elastic component 203 is pagoda spring;
In addition: it should be noted that above-mentioned specific embodiment is only a prioritization scheme of this patent, the skill of this field Any change or improvement that art personnel are done according to above-mentioned design, within the protection domain of this patent..

Claims (4)

1. a kind of assembly technology of outdoor open-close type current transformer, it is characterised in that: the technique includes following steps:
Step 1: the upper half is assembled:
Upper core (101) is fit into upper core shell (102) by step 1.1;
Coil (301) is wrapped on upper core shell (102) by step 1.2;
Upper seal (105) is set on upper sealing baffle (104) by step 1.3;
Upper core shell (102) is installed in upper housing (106) by step 1.4, by the upper of upper core shell (102) in installation process Sealing ring (105) is along upper card slot (106.2) insertion upper housing (106);
The lead-out wire of coil (301) is connected with connecting terminal (401) by step 1.5 afterwards across upper housing (106);
Connecting terminal (401) is installed on upper housing (106) by step 1.6;
Upper side cover (107) is placed on upper housing (106) by step 1.7, and the sealing strip of the upper protrusion of upper side cover (107) is inserted It is placed in the upper seal groove (106.1) of upper housing (106);
Seam crossing between step 1.8, upper housing (106) and upper side cover (107) is coated with sealant;
The intracavitary carry out sealant pouring and sealing of shell that step 1.9, upper housing (106) and upper side cover (107) are constituted;
Step 2: lower half is assembled:
Elastic component (203) is placed in lower core shell (202) by step 2.1;
Lower core (201) is fit into lower core shell (202) by step 2.2, and elastic component (203) is located at lower core (201) Bottom and lower core shell (202) between;
Lower seal (205) is set on lower sealing baffle (204) by step 2.3;
Lower core shell (202) is installed in lower case (206) by step 2.4, will be under lower core shell (202) in installation process Sealing ring (205) is along lower bayonet slot (206.2) insertion lower case (206);
Lower side cover (207) is placed on lower case (206) by step 2.5, and the sealing strip of the upper protrusion of lower side cover (207) is inserted It is placed in the lower seal groove cavity (206.1) of lower case (206);
Seam crossing between step 2.6, lower case (206) and lower side cover (207) is coated with sealant;
Step 3: the upper half is connected with lower half by snap component (501);The bottom of upper core shell (102) installs at this time In constituting first of sealing on lower seal (205), sealing inserted sheet (206.3), which is inserted in sealing slot (105.1), constitutes the Two sealings, upper seal (105), which is installed, constitutes three seals in the top of lower case (206).
2. a kind of assembly technology of outdoor open-close type current transformer as described in claim 1, it is characterised in that: the mutual inductor It include the upper half and lower half connected by snap component (501);
The upper half includes the upper core (101) in upper housing (106), and is in the upper core of inverted " U " shape structure (101) it is installed in upper core shell (102), the top of the upper core shell (102) is arranged two coil baffles (103) and constitutes line Coil, coil (301) are wound between two coil baffles (103), are provided at two open ends of upper core shell (102) Baffle (104) are sealed on circle, are set with upper seal (105) in sealing baffle (104) on this, the upper seal (105) Sealing slot (105.1) is provided on end face;It is provided on the inner wall of upper housing (106) card slot (106.2), above-mentioned upper sealing (105) are enclosed in card slot (106.2) on this;
The lower half includes the lower core (201) in lower case (206), and the lower core (201) of "u"-shaped is pacified Loaded in lower core shell (202), it is provided with elastic component (203) between the lower core (201) and lower core shell (202), it is described It is provided with lower sealing baffle (204) at two open ends of lower core shell (202), is set on the lower sealing baffle (204) Have lower seal (205), is provided with lower bayonet slot (206.2), above-mentioned lower seal on the inner wall of the lower core shell (202) (205) in the lower bayonet slot (206.2), an annular is provided at the top of two open ends of the lower core shell (202) The sealing inserted sheet (206.3) of structure, and seal the circumferential periphery that inserted sheet (206.3) are set to lower core (201);
Behind the upper half and lower half pairing, the bottom of above-mentioned upper core shell (102) is installed in constituting first on lower seal (205) Road sealing, sealing inserted sheet (206.3), which is inserted in sealing slot (105.1), constitutes second sealing, and upper seal (105) installs Three seals are constituted in the top of lower case (206).
3. a kind of assembly technology of outdoor open-close type current transformer as claimed in claim 2, it is characterised in that: the upper housing (106) it is provided on side joint face seal groove (106.1), and is provided on upper side cover (107) and is inserted into seal groove on this (106.1) sealing strip in;The intracavitary sealant pouring and sealing of shell that the upper housing (106) and upper side cover (107) are constituted;The lower case (206) it is provided on side joint face lower seal groove cavity (206.1), is provided on lower side cover (207) and is inserted into the lower seal groove cavity (206.1) the intracavitary sealant pouring and sealing of shell constituted in the sealing strip in, the lower case (206) and lower side cover (207).
4. a kind of assembly technology of outdoor open-close type current transformer as claimed in claim 2, it is characterised in that: the elastic component It (203) is pagoda spring.
CN201810775748.7A 2018-07-16 2018-07-16 A kind of assembly technology of outdoor open-close type current transformer Pending CN109036822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810775748.7A CN109036822A (en) 2018-07-16 2018-07-16 A kind of assembly technology of outdoor open-close type current transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810775748.7A CN109036822A (en) 2018-07-16 2018-07-16 A kind of assembly technology of outdoor open-close type current transformer

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Publication Number Publication Date
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Application Number Title Priority Date Filing Date
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109500008A (en) * 2018-12-20 2019-03-22 吴志泉 Button type pig
CN109655642A (en) * 2019-01-23 2019-04-19 柏宜照明(上海)股份有限公司 Open-type residual current transformer
CN109675873A (en) * 2018-12-20 2019-04-26 吴志泉 Water process electronic descaling device
CN110610801A (en) * 2019-08-29 2019-12-24 江阴市星火电子科技有限公司 Puncture type outdoor current transformer

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CN106373714A (en) * 2016-10-17 2017-02-01 江阴市星火电子科技有限公司 Waterproof type mutual inductor and assembling process therefor
CN106847469A (en) * 2017-03-22 2017-06-13 济南铂晶电子科技有限公司 A kind of waterproof Open Type Electric Current Mutual Inductor and encapsulating method
WO2017146256A1 (en) * 2016-02-26 2017-08-31 大電株式会社 Current transformer
CN107644728A (en) * 2017-10-25 2018-01-30 济南铂晶电子科技有限公司 Transformer
CN108172386A (en) * 2018-03-06 2018-06-15 浙江天际互感器有限公司 A kind of Open Type Electric Current Mutual Inductor of outdoor desirable voltage signal
CN108281268A (en) * 2018-04-04 2018-07-13 宁波台龙电力科技有限公司 A kind of high-precision anti-open-close type mutual inductor of height

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205318967U (en) * 2016-01-22 2016-06-15 国家电网公司 Novel current transformer that can install with electricity fast
WO2017146256A1 (en) * 2016-02-26 2017-08-31 大電株式会社 Current transformer
CN106373714A (en) * 2016-10-17 2017-02-01 江阴市星火电子科技有限公司 Waterproof type mutual inductor and assembling process therefor
CN106847469A (en) * 2017-03-22 2017-06-13 济南铂晶电子科技有限公司 A kind of waterproof Open Type Electric Current Mutual Inductor and encapsulating method
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109500008A (en) * 2018-12-20 2019-03-22 吴志泉 Button type pig
CN109675873A (en) * 2018-12-20 2019-04-26 吴志泉 Water process electronic descaling device
CN109500008B (en) * 2018-12-20 2023-12-29 江苏沛德水处理设备有限公司 Butt-buckling type pipeline scaler
CN109675873B (en) * 2018-12-20 2024-07-02 吴志泉 Electronic scale remover for water treatment
CN109655642A (en) * 2019-01-23 2019-04-19 柏宜照明(上海)股份有限公司 Open-type residual current transformer
CN109655642B (en) * 2019-01-23 2023-12-01 柏宜照明(上海)股份有限公司 Open type residual current transformer
CN110610801A (en) * 2019-08-29 2019-12-24 江阴市星火电子科技有限公司 Puncture type outdoor current transformer

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Application publication date: 20181218

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