CN111596250A - Portable zero sequence current transformer live-line testing device - Google Patents
Portable zero sequence current transformer live-line testing device Download PDFInfo
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- CN111596250A CN111596250A CN202010601552.3A CN202010601552A CN111596250A CN 111596250 A CN111596250 A CN 111596250A CN 202010601552 A CN202010601552 A CN 202010601552A CN 111596250 A CN111596250 A CN 111596250A
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- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 239000002184 metal Substances 0.000 claims abstract description 56
- 238000001514 detection method Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
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- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
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- 230000001939 inductive effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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Abstract
In order to solve the problem of potential safety hazard in the process of testing the mutual inductor, the invention provides a portable zero-sequence current mutual inductor live-line testing device which comprises an insulating shell, a fixed rod, a handle fixedly connected to the rear end of the fixed rod, a movable rod, a 20866a type frame, a 20866a signal display circuit and a polarity testing circuit, wherein the signal display circuit is arranged between the type frame and the fixed rod and consists of a first metal sheet, a first power supply, an indicator lamp and a second metal sheet which are sequentially connected in series through a first lead, the polarity testing circuit consists of a third metal sheet, a stroke switch, a second power supply and a fourth metal sheet which are sequentially connected in series through a second lead, the stroke switch is fixedly connected to the front part inside the fixed rod, the fixed rod slides forwards, the front end of the fixed rod is connected with the 2086666a first metal sheet and a second metal sheet, the third metal sheet is connected with the fourth metal sheet, and the stroke switch is normally open, when the moving rod moves forwards, the front end of the moving rod touches the travel switch button, and the travel switch is closed.
Description
Technical Field
The invention relates to the technical field of current transformers, in particular to a portable zero-sequence current transformer live-line testing device.
Background
At present, a medium-voltage distribution network mostly adopts an operation mode that a neutral point is not grounded or is grounded through an arc suppression coil, a zero sequence current transformer is arranged on an outgoing cable of a 10kV bus, when a ground fault occurs, zero sequence current can occur in a 10kV distribution system, and the zero sequence current transformer is used for inducing the zero sequence current, so that a grounding line selection device can accurately detect and identify a fault line.
In the installation process of the zero sequence current transformer, a phenomenon of wrong polarity installation may occur, which may cause a wrong direction of the zero sequence current collected by the grounding line selection device, and a grounding fault line cannot be accurately selected.
The current methods for testing the polarity of the zero-sequence current transformer are power failure tests, and the method for detecting the polarity of the zero-sequence current transformer by powering off an operating line is obviously unrealistic due to the requirement of power supply reliability of a power system.
Disclosure of Invention
In order to solve the above problems, the invention provides a portable zero sequence current transformer live-line testing device, which adopts the following technical scheme:
a portable zero-sequence current transformer live-line testing device is characterized by mainly comprising an insulating shell, a fixed rod, a handle, a moving rod, a 20866a frame, a signal display circuit and a polarity test circuit, wherein the fixed rod is connected inside the insulating shell in a sliding mode along the length direction of the insulating shell, the handle is fixedly connected to the rear end of the fixed rod, the moving rod is coaxially distributed with the fixed rod and slides along the length direction of the fixed rod, the 20866is fixedly connected to the front of the insulating shell, the signal display circuit is composed of a first metal sheet, a first power supply, an indicator lamp and a second metal sheet which are sequentially connected in series through a first lead, the first metal sheet is fixedly connected to the front end face of the fixed rod, the second metal sheet is fixedly connected to the 20866, the position of the second metal sheet is correspondingly distributed on the frame, one end of the first lead is fixedly connected with the first metal sheet and is sequentially connected with the first power supply and the, the other end is fixedly connected with a second metal sheet; the polarity detection circuit is composed of a third metal sheet, a travel switch, a second power supply and a fourth metal sheet which are sequentially connected in series through a second lead, the travel switch is fixedly connected to the front part inside the fixed rod, the third metal sheet is fixedly connected to the front end face of the fixed rod, and the fourth metal sheet is fixedly connected to a 20866a jig and is distributed in a position corresponding to the third metal sheet; the fixing rod slides forwards and the front end of the fixing rod is connected with 20866;, the first metal sheet is connected with the second metal sheet, the third metal sheet is connected with the fourth metal sheet, the travel switch is normally open, and when the moving rod moves forwards, the front end of the moving rod touches the travel switch button and the travel switch is closed.
Preferably, the first lead is distributed along the inner part of the fixing rod and the inner part of the 20866;, and the first power supply and the indicator lamp are both fixedly connected to the 20866; (20866;).
Preferably, the second lead is distributed in the fixing rod and the 20866;, and the second power supply is fixedly connected to the insulating shell.
Preferably, the rear end of the insulating shell is further provided with a sliding seat located below the handle, the sliding seat is fixedly connected below the rear end of the insulating shell and internally provided with a sliding groove, and the lower end of the handle is connected with the sliding groove in a front-back sliding manner.
Preferably, a first spring is arranged between the front end of the handle and the sliding seat, and the axis of the first spring is distributed along the front-back direction.
Preferably, the rear end of the sliding groove on the sliding seat is provided with a limiting block with adjustable height position.
Preferably, the front end of the limiting block is connected with the upper surface of the sliding groove through a compression spring, the rear end of the limiting block is hinged with the upper surface of the sliding groove, and the front end of the upper end surface of the limiting block is positioned above the lower end surface of the handle in a conventional state.
Preferably, the rear end of the movable rod is connected with a push rod for pushing the movable rod to slide forwards.
Preferably, the handle is the rectangular frame structure, and the carriage release lever rear end passes and lies in inside the handle and articulated with the push rod behind the handle front end, the push rod comprises the second body of rod of first body of rod fixed connection at first body of rod rear, and the first body of rod distributes along the slope downwards backward from the back, and first body of rod front end is articulated with the handle and can follow the slope of handle inner wall and upwards rotate, the second body of rod upwards distributes of inclining backward from the back, and the second body of rod is certain contained angle distribution with the first body of rod to articulated linking to each other between carriage release lever and the first body of rod and the second body of rod tie point.
Preferably, a return spring is arranged between the first rod body and the handle.
The invention has the beneficial effects that: the device integrates the signal indicating circuit and the polarity detection circuit, can realize the polarity test of the zero sequence current transformer under the electrified condition, ensures that testers and electrified equipment can guarantee enough safe distance, does not need to power off the circuit, and has the effects of safety, reliability, convenience, rapidness, time saving and labor saving.
Drawings
FIG. 1 is a schematic view of the structure of the present invention
FIG. 2 is a partial schematic view of the front half of FIG. 1
FIG. 3 is a schematic view of the rear half of the mechanism of FIG. 1 (return spring not shown)
FIG. 4 is a schematic view of a connection structure of a limiting block and a sliding seat
FIG. 5 is a schematic view of the detection state
FIG. 6 is a schematic diagram of a signal display circuit
FIG. 7 is a schematic diagram of a polarity detection circuit
The device comprises a base, a handle, a fixing rod, a moving rod, a push rod, a first rod body, a second rod body, a handle, a fixing rod, a moving rod, a push rod, a first rod body, a second rod body, a return spring, a limiting block, a sliding seat, a sliding groove, a compression spring, a first spring, a travel switch, a first battery, a second battery, a light, a first metal connecting piece, a second metal connecting piece, a third metal connecting piece, a fourth metal connecting piece, a 19-Jiong type frame, a first lead wire, a second lead wire, a resistor and a resistor, wherein the insulating shell is 1-insulating shell, the handle is 2-3-fixing rod, the moving rod is 4-moving rod, the push rod is 5-push rod.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to fig. 1-7. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on actual use, are used for convenience of description of the invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the invention.
The portable zero-sequence current transformer live-line testing device shown in fig. 1-7 mainly comprises an insulating shell 1, a fixed rod 3, a movable rod 3, a handle 2, a sliding seat 7, a limiting block 6, a 20866a jig 19, a signal display circuit and a polarity detection circuit, wherein the insulating shell 1 is a cylindrical shell which is hollow inside and has no covers at the front end and the rear end, in the actual use process, the axis of the insulating shell 1 is distributed along the front-rear direction, the fixed rod 3 is a cylindrical shell which is hollow inside and has no cover at the rear end, the fixed rod 3 is coaxially and slidably connected with the inside of the insulating shell 1 front and rear, the handle 2 is fixedly connected with the rear end of the fixed rod 3, the handle 2 is in a rectangular frame structure, the length is distributed along the front-rear direction, the rear end of the fixed rod 3 is fixedly connected with the upper part of the front end of the handle 2, the rear end of, the bottom plate of the sliding seat 7 is provided with sliding grooves 8 distributed in the front-back direction, the handle 2 is matched with the sliding grooves 8, the handle 2 can slide in the front-back direction of the sliding grooves 8, a first spring 10 is connected between the front end of the handle 2 and the inner wall of the front end of the sliding seat 7, the axis of the first spring 10 is distributed in the front-back direction and is mainly used for placing the handle 2 to be pulled out of the sliding grooves 8, in addition, a limit block 6 is further arranged at the rear end in the sliding grooves 8, the rear end of the limit block 6 is hinged with the sliding seat, the front end is fixedly connected with the sliding grooves 8 through compression springs 9 distributed in the vertical direction of the axis, the compression springs 8 jack the limit block 6 to a certain height without being influenced by external force, the front end of the upper end face of the limit block 6 is higher than the lower end face of the handle 2, when the limit block 6 is subjected to vertical downward force, the upper end, make things convenient for handle 2 roll-off backward, compression spring 8 set up main aim at after handle 2 pushes forward, can not slide backward, guarantee that the position of 3 front ends of dead lever is unchangeable, can drive dead lever 3 through handle 2 and slide around insulating housing 1 is inside, sliding tray 8 plays the guide effect to the slip direction, and stopper 6 and first spring 10 are used for restricting the position of handle 2.
The moving rod 3 is coaxially distributed inside the fixed rod 3, and the rear end of the moving rod 3 is connected with the push rod 5 after passing through the front end of the handle 2, the structure of the push rod 5 is shown in fig. 1 and fig. 3, the push rod 5 is composed of a first rod 501 and a second rod 502 fixedly connected with the rear end of the first rod 501, the axis of the first rod 501 is inclined from back to front and distributed downwards, namely the front end is positioned below the rear end, the front end of the first rod 501 is hinged with the front end of the inner wall of the handle 2, the first rod 501 can rotate forwards along the handle 2, the axis of the second rod 502 is inclined from back to front and distributed upwards by a certain angle, namely the front end is positioned above the rear end, a return spring 503 is fixedly connected between the second rod 502 and the upper end of the inner wall of the handle 2, and the rear end of the moving rod 3 is hinged with the connection point between the first rod 501 and the second rod 502, the first rod 501 can be, meanwhile, the band-pass moving rod 3 moves forward, and after the second rod body 502 is released, the push rod 5 and the moving rod 3 are driven to reset under the action of the reset spring 503.
20866and a jig 19 are fixedly connected to the upper side of the front end of the insulating housing 1, the 20866and jig 19 are rectangular frame structures with openings at the lower ends, the length direction of the frames is distributed along the axial direction of the shaft 1 of the insulating housing, the right end of the fixing rod 3 is fixedly connected with a first metal sheet 15 and a second metal sheet 17 which are distributed up and down, 20866is fixedly connected to the lower end of the inner wall of the right side of the jig 19 and a groove which is matched and connected with the right end of the fixing rod 3 is arranged in the groove, a second metal sheet 16 and a fourth metal sheet 18 which are distributed up and down are arranged in the groove, one end of a first lead 20 is connected with the first metal sheet 15, the first lead 20 is distributed leftwards in the fixing rod 3 and then passes through the insulating housing 1 upwards to enter 20866, the inside the jig 19 is connected with an indicator lamp 14 and a first power supply 12 in series in turn and then is connected with the second metal sheet 16, the first metal sheet 15, the indicator lamp 14, the first power supply 12, the second metal, the indicating lamp 14 and the first power source 12 are fixedly connected to the 20866;, the first power source 12 adopts dry batteries, when the handle 2 drives the fixing rod 3 to slide forwards, and when the right end of the fixing rod 3 contacts with the 20866;, the position of the handle 2 and the fixing rod 3 is fixed by the limiting block 6, the first metal sheet 15 contacts with the second metal sheet 16, the circuit shown in fig. 6 is conducted, and the indicating lamp 14 is lighted; a travel switch 11 located at the front end of the movable rod 4 is fixedly connected inside the fixed rod 3, the travel switch 11 is of a normally open structure, a switch button is located right in front of the movable rod 4, a second power supply 13 is fixedly connected above the front portion of the insulating shell 1, the third metal sheet 17, the travel switch 11, the second power supply 13 and the fourth metal sheet 18 are sequentially connected in series through a second lead 21 to form a polarity detection circuit shown in fig. 7, the second lead 21 is located inside the corresponding structure when the fixed rod 3, 20866and the jig 19 are located, and when the second rod body 502 is pulled upwards, the movable rod 4 slides forwards and contacts with the switch button of the travel switch 11, so that the circuit shown in fig. 7 is conducted.
The operation steps of the device are as follows:
(1) firstly, a milliampere ammeter is connected in series to the output end L, N of the zero sequence current transformer (the output end L, N of the zero sequence current transformer leads a lead to a terminal block of a secondary equipment area respectively, and the ammeter is connected in series at the position, so that a sufficient safety distance can be kept between the ammeter and an operating cable, and no danger exists).
(2) The positive edge-shaped lantern ring at the top of the device is embedded into the zero sequence current transformer.
(3) The handle 2 and the fixed rod 3 are pushed to the working position and are clamped at the position of the limit block 6, at the moment, the right end of the fixed rod 3 is 20866, the groove is arranged on the inner wall of the right end of the fixture 19, and the indicator light 14 is lightened.
(4) The push rod 5 is lifted upwards and then released, the front end of the moving rod 4 touches the travel switch 11, namely, the normally open contact of the travel switch is closed instantly, and at the moment, the polarity test circuit is suddenly conducted to generate sudden change current.
(5) Observing the deflection direction of a pointer of the milliampere meter, and if the pointer is positively deflected, indicating that the polarity of the zero sequence current transformer is correct; otherwise, the polarity of the zero sequence current transformer is incorrect.
(6) And (3) moving the handle 2 and the fixing rod 3 leftwards, resetting each component, and then taking the positive edge-shaped lantern ring at the top of the device out of the zero sequence current transformer, thereby completing the polarity live-line test of the zero sequence current transformer once, and repeating the steps (4) and (5) for 2-3 times to strengthen and verify the test conclusion in order to ensure the accuracy of the polarity test.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.
Claims (10)
1. A portable zero-sequence current transformer live-line testing device is characterized by mainly comprising an insulating shell, a fixed rod, a handle, a moving rod, a 20866a frame, a signal display circuit and a polarity test circuit, wherein the fixed rod is connected inside the insulating shell in a sliding mode along the length direction of the insulating shell, the handle is fixedly connected to the rear end of the fixed rod, the moving rod is coaxially distributed with the fixed rod and slides along the length direction of the fixed rod, the 20866is fixedly connected to the front of the insulating shell, the signal display circuit is composed of a first metal sheet, a first power supply, an indicator lamp and a second metal sheet which are sequentially connected in series through a first lead, the first metal sheet is fixedly connected to the front end face of the fixed rod, the second metal sheet is fixedly connected to the 20866, the position of the second metal sheet is correspondingly distributed on the frame, one end of the first lead is fixedly connected with the first metal sheet and is sequentially connected with the first power supply and the, the other end is fixedly connected with a second metal sheet; the polarity detection circuit is composed of a third metal sheet, a travel switch, a second power supply and a fourth metal sheet which are sequentially connected in series through a second lead, the travel switch is fixedly connected to the front part inside the fixed rod, the third metal sheet is fixedly connected to the front end face of the fixed rod, and the fourth metal sheet is fixedly connected to a 20866a jig and is distributed in a position corresponding to the third metal sheet; the fixing rod slides forwards and the front end of the fixing rod is connected with 20866;, the first metal sheet is connected with the second metal sheet, the third metal sheet is connected with the fourth metal sheet, the travel switch is normally open, and when the moving rod moves forwards, the front end of the moving rod touches the travel switch button and the travel switch is closed.
2. The live-line testing device of the portable zero-sequence current transformer according to claim 1, wherein the first conducting wire is distributed along the inside of the fixing rod and the inside of a 20866;, and the first power source and the indicator lamp are both fixedly connected to the 20866;.
3. The live-line testing device of the portable zero-sequence current transformer according to claim 1, wherein the second conducting wire is distributed in the fixing rod and the 20866;, and the second power supply is fixedly connected to the insulating shell.
4. The live-line testing device of the portable zero-sequence current transformer according to claim 1, wherein a sliding seat is further disposed at the rear end of the insulating housing and below the handle, the sliding seat is fixedly connected below the rear end of the insulating housing and internally provided with a sliding groove, and the lower end of the handle is connected with the sliding groove in a front-back sliding manner.
5. The live-line testing device of the portable zero-sequence current transformer according to claim 4, wherein a first spring with an axis distributed along a front-back direction is arranged between the front end of the handle and the sliding seat.
6. The live-line testing device of the portable zero-sequence current transformer according to claim 4 or 5, wherein a limiting block with an adjustable height position is arranged at the rear end in the sliding groove on the sliding seat.
7. The live-line testing device of the portable zero-sequence current transformer according to claim 6, wherein the front end of the limiting block is connected with the upper surface of the sliding groove through a compression spring, the rear end of the limiting block is hinged with the upper surface of the sliding groove, and the front end of the upper end surface of the limiting block is positioned above the lower end surface of the handle in a normal state.
8. The live-line testing device of the portable zero-sequence current transformer according to claim 1, wherein a push rod for pushing the moving rod to slide forward is connected to the rear end of the moving rod.
9. The live-line testing device of claim 8, wherein the handle is of a rectangular frame structure, the rear end of the moving rod passes through the front end of the handle and is located inside the handle, and the moving rod is hinged to the push rod, the push rod is composed of a first rod fixedly connected to a second rod behind the first rod, the first rod is inclined downward from back to front, the front end of the first rod is hinged to the handle and can rotate upward from the inner wall of the handle, the second rod is inclined upward from back to front, the second rod is arranged at an included angle with the first rod, and the moving rod is hinged to a connection point between the first rod and the second rod.
10. The live-line testing device of the portable zero-sequence current transformer according to claim 9, wherein a return spring is disposed between the first rod and the handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010601552.3A CN111596250A (en) | 2020-06-29 | 2020-06-29 | Portable zero sequence current transformer live-line testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010601552.3A CN111596250A (en) | 2020-06-29 | 2020-06-29 | Portable zero sequence current transformer live-line testing device |
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| Publication Number | Publication Date |
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| CN111596250A true CN111596250A (en) | 2020-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010601552.3A Pending CN111596250A (en) | 2020-06-29 | 2020-06-29 | Portable zero sequence current transformer live-line testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285488A (en) * | 2020-10-26 | 2021-01-29 | 中国人民解放军火箭军工程大学 | Distribution line fault diagnosis device and diagnosis method |
-
2020
- 2020-06-29 CN CN202010601552.3A patent/CN111596250A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285488A (en) * | 2020-10-26 | 2021-01-29 | 中国人民解放军火箭军工程大学 | Distribution line fault diagnosis device and diagnosis method |
| CN112285488B (en) * | 2020-10-26 | 2023-12-26 | 中国人民解放军火箭军工程大学 | Distribution line fault diagnosis device and diagnosis method |
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