CN110836994A - All-insulation type capacitor voltage transformer - Google Patents
All-insulation type capacitor voltage transformer Download PDFInfo
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- CN110836994A CN110836994A CN201810928702.4A CN201810928702A CN110836994A CN 110836994 A CN110836994 A CN 110836994A CN 201810928702 A CN201810928702 A CN 201810928702A CN 110836994 A CN110836994 A CN 110836994A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
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- Transformers For Measuring Instruments (AREA)
Abstract
The invention relates to the field of voltage transformers, in particular to a full-insulation type capacitor voltage transformer, wherein an A-phase capacitor voltage divider and a B-phase capacitor voltage divider are symmetrically arranged at the upper side of an oil tank, an A-phase high-voltage capacitor C1 and a middle-voltage capacitor C2 are arranged in the A-phase capacitor voltage divider, a B-phase high-voltage capacitor C1' is arranged in the B-phase capacitor voltage divider, an A-phase first wiring sleeve and an A-phase second wiring sleeve are arranged at the bottom end of the A-phase capacitor voltage divider, a B-phase wiring sleeve is arranged at the bottom end of the B-phase capacitor voltage divider, an A-phase high-voltage capacitor C1 is connected with the A-phase first wiring sleeve, the A-phase first wiring sleeve is connected with a middle transformer T through a first line, the middle-voltage capacitor C2 is connected with the A-phase second wiring sleeve, and the B-phase high, and the B-phase wiring sleeve is connected with the A-phase second wiring sleeve through a second line, and the A-phase second wiring sleeve is connected with the intermediate transformer T through a third line. The invention is used for measuring the line voltage between the phase and the middle phase of the three-phase transmission line, and has high impact insulation strength and good stability.
Description
Technical Field
The invention relates to the field of voltage transformers, in particular to a full-insulation type capacitor voltage transformer.
Background
A Capacitor Voltage Transformer (CVT) is a voltage transformer composed of a capacitive voltage divider and an electromagnetic unit, and when the voltage transformer works under normal use conditions, the secondary voltage of the electromagnetic unit is substantially proportional to the primary voltage applied to the capacitive voltage divider, and the phase difference is close to zero, and has the function of a ground voltage transformer, as shown in fig. 8, in general, the capacitive voltage divider of the capacitor voltage transformer is composed of a main capacitor C1 and a voltage dividing capacitor C2 connected in series, an intermediate voltage is obtained by using the voltage dividing capacitor C2, and then measurement is performed on the secondary side through the intermediate transformer in the electromagnetic unit and a relay protection circuit is connected on the auxiliary secondary side. However, the conventional capacitive voltage transformers are grounded capacitive voltage transformers, and can only test the voltage of a three-phase power system relative to the ground, but cannot measure the line voltage between phases in a three-phase power transmission line.
Disclosure of Invention
The invention aims to provide a full-insulation type capacitor voltage transformer which is used for measuring line voltage between phases in a three-phase power transmission line and has high impact insulation strength and good stability.
The purpose of the invention is realized by the following technical scheme:
a full-insulation type capacitor voltage transformer comprises an A-phase capacitor voltage divider, a B-phase capacitor voltage divider, an oil tank and an electromagnetic unit, wherein the electromagnetic unit is arranged in the oil tank, the A-phase capacitor voltage divider and the B-phase capacitor voltage divider are symmetrically arranged on the upper side of the oil tank, an A-phase high-voltage capacitor C1 and a medium-voltage capacitor C2 are arranged in the A-phase capacitor voltage divider, a B-phase high-voltage capacitor C1' is arranged in the B-phase capacitor voltage divider, an A-phase first wiring sleeve and an A-phase second wiring sleeve are arranged at the bottom end of the A-phase capacitor voltage divider, a B-phase wiring sleeve is arranged at the bottom end of the B-phase capacitor voltage divider, an A-phase high-voltage capacitor C1 is connected with the A-phase first wiring sleeve, the A-phase first wiring sleeve is connected with a medium transformer T in the electromagnetic unit through a first line, a medium-voltage capacitor C2 is connected with the A-phase second wiring sleeve, and a B-phase high-voltage capacitor C, and the B-phase wiring sleeve is connected with the A-phase second wiring sleeve through a second line, and the A-phase second wiring sleeve is connected with the intermediate transformer T in the electromagnetic unit through a third line.
The oil tank upper end both sides all are equipped with the inclined plane, A looks capacitance voltage divider and B looks capacitance voltage divider symmetry set up and install respectively on the different inclined planes of oil tank upper end both sides all are equipped with supporting component in each inclined plane bottom.
The supporting assembly comprises a supporting plate, a push rod and a top plate, the supporting plate is fixedly arranged on an oil tank, the push rod penetrates through the supporting plate in an inclined mode, the push rod is in threaded connection with the supporting plate, the top plate is hinged to the upper end of the push rod, and a screw cap is arranged at the lower end of the push rod.
Three threaded holes are uniformly distributed in the bearing plate along the circumferential direction, the axis of each threaded hole forms an α included angle with the central axis of the bearing plate, and two ejector rods respectively penetrate through the first threaded holes in the two sides of the bearing plate during supporting, or one ejector rod penetrates through the second threaded hole in the middle of the bearing plate.
A looks electric capacity voltage divider includes A looks casing and A looks expander A looks casing top is equipped with A looks terminal be equipped with A looks expander in the A looks casing top, A looks high-voltage capacitor C1 and medium voltage capacitor C2 set up in the A looks casing, and set gradually in A looks expander downside A looks expander, A looks high-voltage capacitor C1, medium voltage capacitor C2 with all fill up insulating oil between the A looks casing.
The B-phase capacitor voltage divider comprises a B-phase shell and a B-phase expander, a B-phase terminal is arranged at the top end of the B-phase shell, the B-phase expander is arranged in the top of the B-phase shell, a B-phase high-voltage capacitor C1 'is arranged in the B-phase shell and arranged at the lower side of the B-phase expander, and insulating oil is filled among the B-phase expander, the B-phase high-voltage capacitor C1' and the B-phase shell.
The invention has the advantages and positive effects that:
1. the invention changes the function recognition of the traditional capacitance voltage transformer, can realize Vv wiring mode net hanging and is used for measuring the line voltage between phases in a three-phase power transmission line.
2. Compared with the traditional full-insulation electromagnetic voltage transformer, the high-voltage transformer has higher impact insulation strength, the high voltage of the traditional electromagnetic voltage transformer is borne by the high-voltage coil, and the high-voltage transformer is easily damaged when a power transmission line has fault overvoltage (such as lightning stroke), and the primary overvoltage of the high-voltage transformer is mainly borne by the capacitive voltage divider, so that the steepness of the overvoltage wave head of a power transmission system can be reduced (namely the intensity of the overvoltage can be weakened), and the high-voltage transformer has higher impact insulation strength and better stability, and has a certain protection effect on electric equipment of a power substation.
3. The support assembly is arranged to facilitate installation of the capacitive voltage divider body, the upper end of the capacitive voltage divider body is hung through the ceiling during installation, the lower end of the capacitive voltage divider body is placed on the inclined plane of the oil tank, and then the bottom end position of the capacitive voltage divider body is adjusted through movement of the ejector rod, so that the threaded hole in the bottom end of the capacitive voltage divider body is aligned with the threaded hole in the oil tank and then fixedly connected through the bolt. In addition, a plurality of axially inclined threaded holes are formed in the bearing plate in the support assembly, so that the auxiliary support can be mounted by utilizing two ejector rods for a large-size transformer body, and can also be mounted by utilizing only one ejector rod for a small-size transformer body, and the use is flexible and convenient.
Drawings
Figure 1 is a schematic structural view of the present invention,
figure 2 is a wiring schematic of the invention of figure 1,
figure 3 is a schematic view of the support assembly of figure 1,
figure 4 is a top view of the support plate of figure 3,
figure 5 is an axial angle schematic view of the threaded hole in the support plate of figure 3,
figure 6 is a schematic view of a support arrangement of the support assembly of figure 3,
figure 7 is a schematic view of another support of the support assembly of figure 3,
fig. 8 is a wiring schematic diagram of a conventional capacitive voltage transformer.
The electromagnetic expansion device comprises a phase A terminal 1, a phase A expander 2, insulating oil 3, a phase A shell 4, a phase A first wiring sleeve 5, a phase A second wiring sleeve 6, an electromagnetic unit 7, an oil tank 8, a phase B wiring sleeve 9, a phase B shell 10, a phase B expander 11, a phase B terminal 12, a supporting component 13, a top plate 131, a top rod 132, a supporting plate 133, a hinge shaft 134, a first threaded hole 135 and a second threaded hole 136, wherein the phase A terminal is arranged in the phase A, the phase A expander is arranged in the phase A shell, the phase B wiring sleeve is arranged in the phase A, the phase B wiring sleeve is arranged in the phase B.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-2, the present invention includes an a-phase capacitance voltage divider, a B-phase capacitance voltage divider, an oil tank 8 and an electromagnetic unit 7, wherein the electromagnetic unit 7 is disposed in the oil tank 8, the a-phase capacitance voltage divider and the B-phase capacitance voltage divider are symmetrically disposed on the upper side of the oil tank 8, the a-phase capacitance voltage divider is provided with an a-phase high voltage capacitor C1 and a medium voltage capacitor C2, the B-phase capacitance voltage divider is provided with a B-phase high voltage capacitor C1', the bottom end of the a-phase capacitance voltage divider is provided with an a-phase first connection sleeve 5 and an a-phase second connection sleeve 6, the bottom end of the B-phase capacitance voltage divider is provided with a B-phase connection sleeve 9, the a-phase high voltage capacitor C1 is connected to the a-phase first connection sleeve 5, the a-phase first connection sleeve 5 is connected to a middle transformer T in the electromagnetic unit 7 through a first line, the medium voltage capacitor C2 is connected to the a-phase second connection sleeve 6, and the B-phase high voltage capacitor C1, and the phase B wiring sleeve 9 is connected with the phase A second wiring sleeve 6 through a second line, and meanwhile, the phase A second wiring sleeve 6 is connected with an intermediate transformer T in the electromagnetic unit 7 through a third line. As shown in fig. 2, the a-phase high-voltage capacitor C1 and the B-phase high-voltage capacitor C1 'are connected in parallel, and the medium-voltage capacitor C2 is disposed between the a-phase high-voltage capacitor C1 and the B-phase high-voltage capacitor C1'. Splice trays are well known in the art.
As shown in fig. 1, the a-phase capacitance voltage divider includes an a-phase housing 4 and an a-phase expander 2, the top end of the a-phase housing 4 is provided with an a-phase terminal 1, the top of the a-phase housing 4 is provided with the a-phase expander 2, the a-phase high-voltage capacitor C1 and the medium-voltage capacitor C2 are disposed in the a-phase housing 4 and are sequentially disposed at the lower side of the a-phase expander 2, and the a-phase high-voltage capacitor C1, the medium-voltage capacitor C2 and the a-phase housing 4 are all filled with insulating oil 3.
As shown in fig. 1, the B-phase capacitive voltage divider includes a B-phase housing 10 and a B-phase expander 11, a B-phase terminal 12 is disposed at a top end of the B-phase housing 10, the B-phase expander 11 is disposed in a top portion of the B-phase housing 10, the B-phase high-voltage capacitor C1 'is disposed in the B-phase housing 10 and below the B-phase expander 11, and an insulating oil 3 is filled between the B-phase high-voltage capacitor C1' and the B-phase housing 10.
As shown in fig. 1, the cross section of the upper end of the oil tank 8 is triangular, two sides of the upper end are provided with inclined planes, the phase a capacitor voltage divider and the phase B capacitor voltage divider are symmetrically arranged and respectively mounted on different inclined planes of the upper end of the oil tank 8, and two sides of the upper end of the oil tank 8 are provided with support components 13 at the bottom ends of the inclined planes for auxiliary supporting and mounting of the phase a capacitor voltage divider and the phase B capacitor voltage divider.
As shown in fig. 3, the support assembly 13 includes a support plate 133, a top rod 132 and a top plate 131, one end of the support plate 133 is fixedly mounted on the oil tank 8 by a bolt, the top rod 132 obliquely penetrates through the support plate 133, and the top rod 132 is in threaded connection with the support plate 133, as shown in fig. 5, an oblique threaded hole for the top rod 132 to penetrate through is formed in the support plate 133, the top plate 131 is arranged at the upper end of the top rod 132, the top plate 131 is hinged to the top rod 132 by a hinge shaft 134, a nut is arranged at the lower end of the top rod 132, the top rod 132 can be lifted up and lifted or lowered to separate from a corresponding capacitive voltage divider by screwing the nut, and the top plate 131 is hinged to the top rod 132, so that the top plate 131 can be conveniently adjusted.
As shown in fig. 4 to 7, the supporting plate 133 is semicircular, three threaded holes are uniformly distributed on the supporting plate 133 along a circumferential direction, and as shown in fig. 5, an axis of each threaded hole forms an included angle of α with a central axis of the supporting plate 133, in this embodiment, the included angle of α is 30 °, the supporting assembly 13 can support a corresponding capacitive voltage divider in two ways, one way is as shown in fig. 4 and 6, two push rods 133 respectively penetrate through first threaded holes 135 on two sides of the supporting plate 133 and obliquely push against a capacitive voltage divider body from two sides, this case is mainly suitable for a capacitive voltage divider with a larger volume, another way is as shown in fig. 4 and 7, one push rod 133 penetrates through a second threaded hole 136 in the middle of the supporting plate 133 and pushes against the capacitive voltage divider body, this case is mainly suitable for a capacitive voltage divider with a relatively smaller volume, in which the push rod 133 can be screwed to adjust a height, and the top plate 131 can be rotated to a suitable position to push against the capacitive voltage divider body, and in order to ensure that the supporting is firm, the top plate 131 can be designed into an arc shape.
As shown in fig. 2, the electromagnetic unit 7 includes an intermediate transformer T, a compensation reactor L, a lightning arrester F, a damper Z, and main secondary winding terminals a and b. The electromagnetic unit 7 is well known in the art.
In this embodiment, the a-phase high-voltage capacitor C1, the medium-voltage capacitor C2, and the B-phase high-voltage capacitor C1' all adopt a conventional film-paper composite dielectric structure, which is a technique known in the art.
The working principle of the invention is as follows:
as shown in fig. 8, the conventional capacitive voltage transformer is only provided with one a-phase capacitive voltage divider, and an internal a-phase high-voltage capacitor C1 and a medium-voltage capacitor C2 are connected in series, and the conventional capacitive voltage transformer is a grounded capacitive voltage transformer, and can only test the voltage of a three-phase power system relative to the ground, and cannot measure the line voltage between the phases in the three-phase power transmission line.
As shown in fig. 2, the present embodiment is a 35kV full-insulation type capacitor voltage transformer, and includes an a-phase high-voltage capacitor C1 and a B-phase high-voltage capacitor C1 ', where the a-phase high-voltage capacitor C1 and the B-phase high-voltage capacitor C1 ' are arranged in parallel, and the medium-voltage capacitor C2 is arranged between the a-phase high-voltage capacitor C1 and the B-phase high-voltage capacitor C1 '. When the invention operates, the primary system line voltage is respectively connected to the phase A terminal 1 and the phase B terminal 12, an intermediate voltage is extracted by the medium-voltage capacitor C2, and the intermediate voltage is connected to the intermediate transformer T of the electromagnetic unit 7, so that the function of the full-insulation type voltage transformer is realized. The invention is mainly used for testing the line voltage between phase and phase, and is not used for testing the voltage between phase and phase like the traditional capacitor voltage transformer, in addition, the invention can adopt a Vv wiring mode to hang a net, two (the traditional capacitor voltage transformer needs three) devices can be used for connecting and measuring the line voltage between phase and phase of three phases, and the traditional capacitor voltage transformer can not realize the Vv wiring mode to hang the net due to the limitation of structure and the like. The Vv wiring mode is a well-known technology in the art and is commonly used in a neutral ungrounded system of 35kV and below.
As shown in fig. 1 and fig. 3, since the phase a capacitive voltage divider and the phase B capacitive voltage divider are both obliquely arranged, in the installation process, the threaded holes at the bottom end of the capacitive voltage divider and the threaded holes on the oil tank 8 are often difficult to align, and the installation is very inconvenient. In order to facilitate installation, the bottom ends of the inclined planes at the two sides of the upper end of the oil tank 8 are respectively provided with a support assembly 13 for assisting in supporting a corresponding capacitive voltage divider, a top rod 132 in the support assembly 13 can be screwed to adjust the height, the upper end of the capacitive voltage divider body is hung by a top crane during installation, the lower end of the capacitive voltage divider body is placed on the inclined plane of the oil tank 8, then the top rod 132 in the support assembly 13 is screwed to enable the top rod 132 to abut against the lower end of the capacitive voltage divider body, the bottom end position of the capacitive voltage divider body can be adjusted by moving the top rod 132, a threaded hole at the bottom end of the capacitive voltage divider body is aligned with a threaded hole in the oil tank 8, then the capacitive voltage divider body is fixedly connected with the oil tank 8 through a bolt, the top crane hook at.
Claims (6)
1. The utility model provides a full insulation type capacitance voltage transformer which characterized in that: the transformer comprises an A-phase capacitance voltage divider, a B-phase capacitance voltage divider, an oil tank (8) and an electromagnetic unit (7), wherein the electromagnetic unit (7) is arranged in the oil tank (8), the A-phase capacitance voltage divider and the B-phase capacitance voltage divider are symmetrically arranged on the upper side of the oil tank (8), an A-phase high-voltage capacitor C1 and a medium-voltage capacitor C2 are arranged in the A-phase capacitance voltage divider, a B-phase high-voltage capacitor C1' is arranged in the B-phase capacitance voltage divider, an A-phase first wiring sleeve (5) and an A-phase second wiring sleeve (6) are arranged at the bottom end of the A-phase capacitance voltage divider, a B-phase wiring sleeve (9) is arranged at the bottom end of the B-phase capacitance voltage divider, the A-phase high-voltage capacitor C1 is connected with the A-phase first wiring sleeve (5), the A-phase first wiring sleeve (5) is connected with a middle transformer T in the electromagnetic unit (7) through a first line, and the medium-voltage capacitor C2 is connected with the, and the phase B high-voltage capacitor C1' is connected with the phase B wiring sleeve, the phase B wiring sleeve (9) is connected with the phase A second wiring sleeve (6) through a second line, and the phase A second wiring sleeve (6) is connected with the intermediate transformer T in the electromagnetic unit (7) through a third line.
2. The all-insulated type capacitor voltage transformer according to claim 1, wherein: oil tank (8) upper end both sides all are equipped with the inclined plane, A looks electric capacity voltage divider and B looks electric capacity voltage divider symmetry set up and install respectively on the different inclined planes in oil tank (8) upper end both sides all are equipped with supporting component (13) in each inclined plane bottom.
3. The all-insulated type capacitor voltage transformer according to claim 2, wherein: the supporting assembly (13) comprises a supporting plate (133), a push rod (132) and a top plate (131), the supporting plate (133) is fixedly arranged on the oil tank (8), the push rod (132) obliquely penetrates through the supporting plate (133), the push rod (132) is in threaded connection with the supporting plate (133), the top plate (131) is hinged to the upper end of the push rod (132), and a nut is arranged at the lower end of the push rod (132).
4. The all-insulated capacitor voltage transformer according to claim 3, characterized in that three threaded holes are uniformly distributed on the support plate (133) along the circumferential direction, the axis of each threaded hole forms an α angle with the central axis of the support plate (133), two push rods (133) respectively pass through the first threaded holes (135) on two sides of the support plate (133) during supporting, or one push rod (133) passes through the second threaded hole (136) in the middle of the support plate (133).
5. The all-insulated type capacitor voltage transformer according to claim 1, wherein: a looks electric capacity voltage divider includes A looks casing (4) and A looks expander (2) A looks casing (4) top is equipped with A looks terminal (1) A looks casing (4) top is equipped with A looks expander (2) in A looks casing (4) top, A looks high-voltage capacitor C1 and medium voltage capacitor C2 set up in A looks casing (4), and set gradually in A looks expander (2) downside A looks expander (2), A looks high-voltage capacitor C1, medium voltage capacitor C2 with all be full of insulating oil (3) between A looks casing (4).
6. The all-insulated type capacitor voltage transformer according to claim 1, wherein: the B-phase capacitance voltage divider comprises a B-phase shell (10) and a B-phase expander (11), a B-phase terminal (12) is arranged at the top end of the B-phase shell (10), the B-phase expander (11) is arranged in the top of the B-phase shell (10), a B-phase high-voltage capacitor C1 'is arranged in the B-phase shell (10) and is arranged on the lower side of the B-phase expander (11), and insulating oil (3) is filled between the B-phase expander (11), the B-phase high-voltage capacitor C1' and the B-phase shell (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810928702.4A CN110836994A (en) | 2018-08-15 | 2018-08-15 | All-insulation type capacitor voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810928702.4A CN110836994A (en) | 2018-08-15 | 2018-08-15 | All-insulation type capacitor voltage transformer |
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| Publication Number | Publication Date |
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| CN110836994A true CN110836994A (en) | 2020-02-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810928702.4A Withdrawn CN110836994A (en) | 2018-08-15 | 2018-08-15 | All-insulation type capacitor voltage transformer |
Country Status (1)
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| CN (1) | CN110836994A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2458710Y (en) * | 2000-12-29 | 2001-11-07 | 张京华 | Capacitance voltage transformer for neutral-point non-productive earthing system |
| CN2562328Y (en) * | 2002-06-21 | 2003-07-23 | 桂林电力电容器总厂 | Dry insulating capacitance voltage mutual inductor |
| CN2569308Y (en) * | 2002-09-02 | 2003-08-27 | 倪学锋 | Gas insulation electronic type capacitive voltage mutual inductor |
| CN101593619A (en) * | 2008-06-01 | 2009-12-02 | 江苏思源赫兹互感器有限公司 | A kind of vertical current transformer |
| CN201489990U (en) * | 2009-09-01 | 2010-05-26 | 大连泰克电气有限公司 | JDZ12-10RW outdoor voltage transformer |
| CN102709044A (en) * | 2012-05-28 | 2012-10-03 | 武汉国测恒通智能仪器有限公司 | Integrated electronic mutual inductor device |
| CN104034977A (en) * | 2014-05-29 | 2014-09-10 | 国家电网公司 | Capacitive voltage transformer electrified detector |
| CN204991425U (en) * | 2015-09-30 | 2016-01-20 | 大连北方互感器集团有限公司 | Take outdoor voltage transformer of secondary circuit fuse |
| CN205361789U (en) * | 2016-02-04 | 2016-07-06 | 陕西润诚环保科技有限公司 | Industrialization A -frame |
-
2018
- 2018-08-15 CN CN201810928702.4A patent/CN110836994A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2458710Y (en) * | 2000-12-29 | 2001-11-07 | 张京华 | Capacitance voltage transformer for neutral-point non-productive earthing system |
| CN2562328Y (en) * | 2002-06-21 | 2003-07-23 | 桂林电力电容器总厂 | Dry insulating capacitance voltage mutual inductor |
| CN2569308Y (en) * | 2002-09-02 | 2003-08-27 | 倪学锋 | Gas insulation electronic type capacitive voltage mutual inductor |
| CN101593619A (en) * | 2008-06-01 | 2009-12-02 | 江苏思源赫兹互感器有限公司 | A kind of vertical current transformer |
| CN201489990U (en) * | 2009-09-01 | 2010-05-26 | 大连泰克电气有限公司 | JDZ12-10RW outdoor voltage transformer |
| CN102709044A (en) * | 2012-05-28 | 2012-10-03 | 武汉国测恒通智能仪器有限公司 | Integrated electronic mutual inductor device |
| CN104034977A (en) * | 2014-05-29 | 2014-09-10 | 国家电网公司 | Capacitive voltage transformer electrified detector |
| CN204991425U (en) * | 2015-09-30 | 2016-01-20 | 大连北方互感器集团有限公司 | Take outdoor voltage transformer of secondary circuit fuse |
| CN205361789U (en) * | 2016-02-04 | 2016-07-06 | 陕西润诚环保科技有限公司 | Industrialization A -frame |
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Application publication date: 20200225 |
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