CN112233931B - Load switch device with PT and installation construction method - Google Patents
Load switch device with PT and installation construction method Download PDFInfo
- Publication number
- CN112233931B CN112233931B CN202011009653.8A CN202011009653A CN112233931B CN 112233931 B CN112233931 B CN 112233931B CN 202011009653 A CN202011009653 A CN 202011009653A CN 112233931 B CN112233931 B CN 112233931B
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- load switch
- switch
- lead
- load
- spring type
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/02—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/64—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid wherein the break is in gas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/6606—Terminal arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
Abstract
The invention belongs to the technical field of live working, in particular to a load switch device with a voltage transformer of a distribution line and an installation construction method, and relates to a load switch device with PT, which comprises a metal shell, an insulated cable outgoing line, an insulated cable incoming line, a spring type spring operating mechanism, an operating handle, an alternating current contactor KM1, an alternating current contactor KM2, a first insulated shaft, a second insulated shaft and an arc-extinguishing vacuum tube capable of being frequently opened and closed, and is characterized in that: the ac contactor KM1 and the ac contactor KM2 form an electrical interlock connection PT. The PT lead inside the switch adopts electric interlocking, so that the PT lead is ensured to be in an off position before the load switch is switched on or off a main loop during fault maintenance, and explosion accidents caused by connecting the load switch with the voltage transformer are avoided.
Description
Technical Field
The invention belongs to the technical field of live working, and particularly relates to a load switch device of a distribution line with a voltage transformer (Potential transformer: PT) and an installation construction method.
Background
The safety rule requires that the transformer can not be connected with a drainage wire, so that high requirements are put on the installation of the load switch with the PT. In recent years, accidents of switch explosion caused by a load switch with PT continuously occur.
At present, the current and latest load switch with PT at home and abroad adopts a typical design scheme, and the typical design scheme independently leads PT leads into a group of drop fuses, and when the load switch is connected or disconnected, the drop fuses are checked to be in the disconnected position, so that the connection of the neutral potential transformer to the switch leads is ensured. However, the three layers of cross arms are arranged up and down in the typical design scheme of the electric power system, the construction is complex, the double-rod construction is easy, the operation position is limited during the single-rod construction, the operation complexity is improved, and the safety risk is correspondingly increased. This is a disadvantage of the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a load switch device with PT and an installation and construction method, so as to solve the problems of explosion of a switch and complex typical design and construction caused by switching on and off the switch with PT.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a load switch device with PT comprises a metal shell, an insulated cable outgoing line, an insulated cable incoming line, a spring type spring operating mechanism, an operating handle, an alternating current contactor KM1 and an alternating current contactor KM2, a first insulated shaft, a second insulated shaft and an arc extinguishing vacuum tube capable of being opened and closed frequently, and is characterized in that: the ac contactor KM1 and the ac contactor KM2 form an electrical interlock connection PT.
Preferably, the load switch device with PT further comprises a double-break switch, wherein an isolating knife is arranged in the double-break switch, and the double-break switch fully ensures the opening and closing safety.
Preferably, the operating handle is provided with a "manual" and an "automatic" position; when the operation handle is in an automatic position, the operation handle controls the first insulation shaft and the second insulation shaft through the spring type spring operation mechanism, the first insulation shaft rotates to correspond to the closing of the double-break switch, and the second insulation shaft rotates to enable the load switch to be pulled to be closed; when the operation handle is in a manual position, the operation handle controls the first insulation shaft and the second insulation shaft through the spring type elastic operation mechanism, the first insulation shaft rotates to correspond to the opening of the double-break switch, and the second insulation shaft rotates to enable the load switch to be disconnected.
Preferably, the first insulating shaft drives a double-break switch; the second insulating shaft drives the arc-extinguishing vacuum tube which can be frequently opened and closed; the combination of the double-fracture switch and the combination of the arc-extinguishing vacuum tube which can be frequently opened and closed enable the load switch to form a main loop; the arc-extinguishing vacuum tube capable of being frequently opened and closed has large opening and closing capacity and long service life, is suitable for frequent operation, can be opened and closed for many times, and does not generate high-pressure gas and harmful gas.
Preferably, the load switch device with PT is filled with the equal-atmosphere SF 6 The metal shell is of a full-sealing structure, and the metal shell is internally provided with SF with equal atmospheric pressure 6 Gas, said equal atmospheric pressure SF 6 The gas has arc extinguishing property and can be used as an insulating medium, thereby achieving the function of protecting the PT load switch device.
Preferably, the insulated cable lead-in wire and the insulated cable lead-out wire are arranged on the left side of the device, the insulated cable lead-out wire is arranged on the right side of the device, and the insulated cable is light in weight and strong in load capacity.
Preferably, the load switch device with PT further comprises a zero sequence current transformer and a line current transformer, wherein the zero sequence current transformer is arranged on the upper side of the part of the insulated cable outgoing line in the metal shell, and the line current transformer is arranged on the lower side of the part of the insulated cable outgoing line in the metal shell; when electric shock or leakage fault occurs in the circuit, the secondary side of the transformer outputs zero sequence current, so that equipment on the connected secondary line is protected; the current transformer converts a large current in the alternating current circuit into a small current with a certain proportion.
The invention also provides a mounting construction method of the load switch with PT, which comprises the following steps:
s1, a load switch is newly connected into a lead wire installation step;
s2, a load switch is operated normally;
s3, the load switch exits the operation;
s4, a step of overhauling the load switch.
Preferably, the S1 specifically comprises the following steps that when a load switch is newly connected to a lead wire for installation, an operation handle is converted to a manual position, an electric interlock KM1/KM2 is put into operation, the KM1 is kept at an off position, and when a spring type spring operation mechanism is operated to pull on or off the load switch, the KM2 forces the KM1 to be always at the off position; at the moment, the load switch lead is electrified; the operation handle is converted to an automatic position, the electric interlocking KM1/KM2 is withdrawn from operation, and when the spring type spring operation mechanism is operated to draw the load switch, the KM1 is in a conducting state, and the PT starts to work normally.
Preferably, the step S2 specifically includes the following steps: under the normal operation construction state of the load switch, when normal pulling-in and pulling-out operations are executed at the moment, the operation handle is always in an automatic position, the electric interlocking KM1/KM2 is withdrawn from operation, the KM1 is kept in a conducting state, and the PT works normally.
Preferably, the step S3 specifically comprises the following steps that an operation handle is switched to a manual position, electric interlocking KM1/KM2 is put into operation, when a spring type spring operation mechanism is operated to disconnect a load switch, the action of KM1 enables a PT connection lead wire to be in a disconnection position, and PT is withdrawn from operation; at this time, the load switch lead is electrically disconnected.
Preferably, the step S4 specifically comprises the following steps that an operation handle is switched to a manual position, an electric interlock KM1/KM2 is put into operation, when a spring type spring operation mechanism is operated to disconnect a load switch, a PT connection lead is in a disconnection position, PT is withdrawn from operation, and at the moment, the load switch lead is disconnected in an electrified manner; performing a switch maintenance step, and after the switch maintenance is finished, connecting a load switch lead in an electrified manner; the operation handle is switched to an automatic position, the electric interlocking KM1/KM2 is withdrawn from operation, and when the spring type spring operation mechanism pulls on the load switch, KM1 is in a conducting state, and PT starts to work normally.
The invention has the beneficial effects that the PT lead inside the switch adopts electrical interlocking, so that the PT lead is ensured to be in the disconnection position before the main loop is switched on or switched off during fault maintenance; meanwhile, the single-layer cross arm installation construction process is adopted, so that the construction difficulty is greatly reduced, and the operation safety is improved. In addition, the invention has reliable design principle, simple structure and very wide application prospect.
It can be seen that the present invention has outstanding substantial features and significant advances over the prior art, as well as its practical advantages.
Drawings
Fig. 1 is a schematic diagram of a load switch with PT.
Wherein, 1-a metal shell; 2-a spring operating mechanism; 3-equal atmospheric pressure SF 6 A gas; 4-double-break switch; 5-insulated cable lead-in; 6-a voltage transformer; 7-an arc-extinguishing vacuum tube which can be frequently opened and closed; 8-a built-in line current transformer; 9-insulating cable outgoing lines; 10-a built-in zero sequence current transformer; 11-a first insulating shaft; 12-a second insulating shaft; 13-ac contactor KM1; 14-ac contactor KM2.
Detailed Description
The present invention will be described in detail below by way of specific examples with reference to the accompanying drawings, the following examples being illustrative of the present invention and the present invention is not limited to the following embodiments.
As shown in fig. 1, a load switching device with PT includes: metal casing (1), insulated cable lead-out wire (9), insulated cable lead-in wire (5), spring bullet operating mechanism (2), operating handle, ac contactor KM1 (13), ac contactor KM2 (14), first insulating axle (11) and second insulating axle (12), but frequently open and shut arc extinguishing vacuum tube (7), its characterized in that: the alternating-current contactor KM1 (13) and the alternating-current contactor KM2 (14) form an electric interlocking connection PT (6).
Preferably, the load switch device with the PT further comprises a double-break switch (4), wherein an isolating knife is arranged in the double-break switch (4), and the double-break switch (4) fully ensures the opening and closing safety.
The operating handle is provided with a manual position and an automatic position; when the operation handle is in an automatic position, the operation handle controls a first insulation shaft (11) and a second insulation shaft (12) through a spring type elastic operation mechanism (2), the first insulation shaft (11) rotates to correspond to the closing of the double-fracture switch (4), and the second insulation shaft (12) rotates to enable the load switch to be pulled to be closed; when the operation handle is in a manual position, the operation handle controls the first insulation shaft (11) and the second insulation shaft (12) through the spring type elastic operation mechanism (2), the first insulation shaft (11) rotates to correspond to the opening of the double-fracture switch (4), and the second insulation shaft (12) rotates to enable the load switch to be disconnected.
The first insulating shaft (11) drives the double-break switch (4); the second insulating shaft (12) drives the arc-extinguishing vacuum tube (7) which can be frequently opened and closed. The closing of the double-break switch (4) and the closing of the arc-extinguishing vacuum tube (7) which can be frequently opened and closed enable the load switch to form a main loop; the arc-extinguishing vacuum tube (7) capable of being frequently opened and closed has large opening and closing capacity and long service life, is suitable for frequent operation, can be opened and closed for many times, and does not generate high-pressure gas and harmful gas.
Equal-atmosphere SF (sulfur hexafluoride) filled in load switch device with PT (potential transformer) 6 The gas (3), the metal shell (1) is of a full-sealing structure, and the metal shell (1) is internally provided with an equal atmospheric pressure SF 6 Gas (3), said equal atmospheric pressure SF 6 The gas (3) has arc extinguishing property and can be used as an insulating medium, thereby achieving the function of protecting the PT load switch device.
The device is characterized by comprising an insulated cable lead-in wire (5) and an insulated cable lead-out wire (9), wherein the insulated cable lead-in wire (5) is arranged on the left side of the device, the insulated cable lead-out wire (9) is arranged on the right side of the device, and the insulated cable is light in weight and strong in load capacity.
The load switch device with PT further comprises a zero sequence current transformer (10) and a line current transformer (8), wherein the zero sequence current transformer (10) is arranged on the upper side of a part of the insulated cable outgoing line (9) in the metal shell (1), and the line current transformer (8) is arranged on the lower side of the insulated cable outgoing line; when electric shock or leakage fault occurs in the circuit, the secondary side of the transformer outputs zero sequence current, so that equipment on the connected secondary line is protected; the current transformer converts a large current in the alternating current circuit into a small current with a certain proportion.
The invention also provides a mounting construction method of the load switch with PT, which comprises the following steps:
s1, a load switch is newly connected into a lead wire installation step;
s2, a load switch is operated normally;
s3, the load switch exits the operation;
s4, a step of overhauling the load switch.
When the load switch is newly connected into a lead for installation, the operating handle is converted to a manual position, the electric interlocking KM1/KM2 is put into operation, the KM1 is kept at an off position, and when the spring type spring operating mechanism is operated to pull on or off the load switch, the KM2 forces the KM1 to be always at the off position; at the moment, the load switch lead is electrified; the operation handle is converted to an automatic position, the electric interlocking KM1/KM2 is withdrawn from operation, and when the spring type spring operation mechanism is operated to draw the load switch, the KM1 is in a conducting state, and the PT starts to work normally.
The step S2 specifically comprises the following steps: under the normal operation construction state of the load switch, when normal pulling-in and pulling-out operations are executed at the moment, the operation handle is always in an automatic position, the electric interlocking KM1/KM2 is withdrawn from operation, the KM1 is kept in a conducting state, and the PT works normally.
The S3 specifically comprises the following steps that an operation handle is switched to a manual position, electric interlocking KM1/KM2 is put into operation, when a spring type spring operation mechanism is operated to disconnect a load switch, the action of KM1 enables a PT connection lead wire to be in a disconnection position, and PT is withdrawn from operation; at this time, the load switch lead is electrically disconnected.
The S4 specifically comprises the following steps that an operation handle is switched to a manual position, electric interlocking KM1/KM2 is put into operation, when a spring type spring operation mechanism is operated to disconnect a load switch, a PT connection lead is in a disconnection position by KM1 action, PT is withdrawn from operation, and at the moment, the load switch lead is disconnected in an electrified manner; performing a switch maintenance step, and after the switch maintenance is finished, connecting a load switch lead in an electrified manner; the operation handle is switched to an automatic position, the electric interlocking KM1/KM2 is withdrawn from operation, and when the spring type spring operation mechanism pulls on the load switch, KM1 is in a conducting state, and PT starts to work normally.
The foregoing disclosure is merely illustrative of the preferred embodiments of the invention and the invention is not limited thereto, since modifications and variations may be made by those skilled in the art without departing from the principles of the invention.
Claims (4)
1. A load switch device with PT comprises a metal shell, an insulated cable outgoing line, an insulated cable incoming line, a spring type spring operating mechanism, an operating handle, an alternating current contactor KM1 and an alternating current contactor KM2, a first insulated shaft, a second insulated shaft and an arc extinguishing vacuum tube capable of being opened and closed frequently, and is characterized in that: the alternating-current contactor KM1 and the alternating-current contactor KM2 form an electric interlocking connection PT;
the mounting construction method of the load switch device with PT comprises the following steps:
s1, a load switch is newly connected into a lead wire installation step;
s2, a load switch is operated normally;
s3, the load switch exits the operation;
s4, a load switch overhauling step;
when the load switch is newly connected into a lead for installation, the operating handle is converted to a manual position, the electric interlocking KM1/KM2 is put into operation, the KM1 is kept at an off position, and when the spring type spring operating mechanism is operated to pull on or off the load switch, the KM2 forces the KM1 to be always at the off position; at the moment, the load switch lead is electrified; the operation handle is converted to an automatic position, the electrical interlock KM1/KM2 is withdrawn from operation, and when the spring type spring operation mechanism is operated to draw the load switch, the KM1 is in a conducting state, and the PT starts to work normally;
the load switch device with PT also comprises a double-break switch, wherein an isolating knife is arranged in the double-break switch; the first insulating shaft drives the double-break switch; the second insulating shaft drives the arc-extinguishing vacuum tube which can be frequently opened and closed;
the step S2 specifically comprises the following steps: in the normal operation construction state of the load switch, when normal pulling-in and pulling-out operations are executed at the moment, the operation handle is always at an automatic position, the electrical interlock KM1/KM2 is withdrawn from operation, the KM1 is kept in a conducting state, and the PT works normally;
the S3 specifically comprises the following steps that an operation handle is switched to a manual position, electric interlocking KM1/KM2 is put into operation, when a spring type spring operation mechanism is operated to disconnect a load switch, the action of KM1 enables a PT connection lead wire to be in a disconnection position, and PT is withdrawn from operation; at this time, the load switch lead is disconnected in a live manner;
the S4 specifically comprises the following steps that an operation handle is switched to a manual position, electric interlocking KM1/KM2 is put into operation, when a spring type spring operation mechanism is operated to disconnect a load switch, a PT connection lead is in a disconnection position by KM1 action, PT is withdrawn from operation, and at the moment, the load switch lead is disconnected in an electrified manner; performing a switch maintenance step, and after the switch maintenance is finished, connecting a load switch lead in an electrified manner; the operation handle is switched to an automatic position, the electric interlocking KM1/KM2 is withdrawn from operation, and when the spring type spring operation mechanism pulls on the load switch, KM1 is in a conducting state, and PT starts to work normally.
2. The load switching device with PT according to claim 1, wherein: the operating handle is provided with a manual position and an automatic position; when the operation handle is in an automatic position, the operation handle controls the first insulation shaft and the second insulation shaft through the spring type spring operation mechanism, the first insulation shaft rotates to correspond to the closing of the double-break switch, and the second insulation shaft rotates to enable the load switch to be pulled to be closed; when the operation handle is in a manual position, the operation handle controls the first insulation shaft and the second insulation shaft through the spring type elastic operation mechanism, the first insulation shaft rotates to correspond to the opening of the double-break switch, and the second insulation shaft rotates to enable the load switch to be disconnected.
3. A load switching device with PT according to claim 2, wherein: the metal shell is of a full-sealing structureThe metal shell is filled with SF with equal atmospheric pressure 6 And (3) gas.
4. A load switching device with PT according to claim 3, wherein: the load switch device with PT further comprises a zero sequence current transformer and a line current transformer, wherein the zero sequence current transformer is arranged on the upper side of the part of the insulated cable outgoing line in the metal shell, and the line current transformer is arranged on the lower side of the insulated cable outgoing line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011009653.8A CN112233931B (en) | 2020-09-23 | 2020-09-23 | Load switch device with PT and installation construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011009653.8A CN112233931B (en) | 2020-09-23 | 2020-09-23 | Load switch device with PT and installation construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112233931A CN112233931A (en) | 2021-01-15 |
| CN112233931B true CN112233931B (en) | 2023-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011009653.8A Active CN112233931B (en) | 2020-09-23 | 2020-09-23 | Load switch device with PT and installation construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112233931B (en) |
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| CN207097707U (en) * | 2017-08-09 | 2018-03-13 | 华电北瑞电气(北京)有限公司 | A kind of regulator cubicle electrical verification anti-misoperation system |
| CN210984601U (en) * | 2019-12-24 | 2020-07-10 | 北京科锐配电自动化股份有限公司 | High-voltage AC load switch with spring operating mechanism |
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2020
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| EP0201695A2 (en) * | 1985-04-16 | 1986-11-20 | BROWN,BOVERI & CIE Aktiengesellschaft | Load-break switch and switching circuit using this load-break switch |
| CN2626111Y (en) * | 2003-05-27 | 2004-07-14 | 贺晓红 | Outdoor high-voltage wattles automatic compensating equipment |
| KR100848123B1 (en) * | 2007-12-27 | 2008-07-24 | 홍정애 | A compact multi-function switchgear |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112233931A (en) | 2021-01-15 |
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