CN114141567A - Terminal box - Google Patents
Terminal box Download PDFInfo
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- CN114141567A CN114141567A CN202111489229.2A CN202111489229A CN114141567A CN 114141567 A CN114141567 A CN 114141567A CN 202111489229 A CN202111489229 A CN 202111489229A CN 114141567 A CN114141567 A CN 114141567A
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- Prior art keywords
- current
- blade
- voltage
- switch
- junction box
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
- H01H21/02—Details
- H01H21/12—Bases; Stationary contacts mounted thereon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
- H01H21/54—Lever switches with blade-type contact co-operating with one or two spring-clip contacts, e.g. knife switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/08—Distribution boxes; Connection or junction boxes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Keying Circuit Devices (AREA)
Abstract
The invention belongs to the technical field of electric power metering equipment, and discloses a junction box. The first current switch comprises a first current knife switch blade and a first current static contact, and the first current knife switch blade is provided with a first current open position and a first current closed position. The second current switch comprises a second current knife switch blade and a second current static contact, and the second current knife switch blade is provided with a second current open position and a second current closed position. When the first current knife switch blade is located at the first current off position and the second current knife switch blade is located at the second current on position, the ammeter is normally connected to the power line, and the first limiting part can lock the relative position between the first current knife switch blade and the second current knife switch blade. When the first current blade is in the first current closed position, the ammeter is disconnected from the power line when the second current blade is in the second current open position.
Description
Technical Field
The invention relates to the technical field of electric power metering equipment, in particular to a junction box.
Background
In the daily operation of an electric power line, a voltage transformer and a current transformer are generally used to measure the voltage or current of the electric power line. Under the requirement of power production operation and maintenance, a voltmeter or an ammeter needs to be replaced under the condition of no power failure.
The ammeter needs to be short-circuited before replacement, the open circuit condition cannot occur, otherwise, high voltage can occur at two ends of the secondary side of the current transformer, and insulation breakdown is caused. Therefore, before replacing the ammeter, the ammeter needs to be short-circuited and then replaced. The two steps are usually controlled by using separate switches, and the two switches are not allowed to be operated mistakenly when the ammeter is not replaced. However, in the operation and maintenance process of the power line, an operator often operates one of the switches by mistake, which results in damage to the current transformer or reduced accuracy.
Therefore, a need exists for a junction box that solves the above problems.
Disclosure of Invention
According to one aspect of the present invention, there is provided a switch capable of restricting relative displacement between two current blades and preventing erroneous operation of one of the switches.
In order to achieve the purpose, the invention adopts the following technical scheme:
a junction box, comprising:
a junction box body;
the first current switch comprises a first current disconnecting link and a first current static contact fixedly connected to the junction box body, the first current disconnecting link is provided with a first current opening position and a first current closing position, and when the first current disconnecting link is located at the first current closing position, the first current disconnecting link is in contact with the first current static contact and is used for enabling an ammeter of a current transformer to be short-circuited; when the first current blade is located at a first current off position, the first current blade is separated from the first current fixed contact;
a second current switch, including a second current blade and a second current stationary contact fixedly connected to the junction box body, wherein the second current blade has a second current open position and a second current closed position, and when the second current blade is located at the second current closed position, the second current blade contacts the second current stationary contact to connect the ammeter to a power line; when the second current disconnecting link is located at a second current disconnecting position, the second current disconnecting link is separated from the second current static contact and is used for disconnecting the ammeter from the power line;
and the first limiting part can lock the relative position between the first current disconnecting link and the second current disconnecting link when the first current disconnecting link is located at a first current disconnecting position and the second current disconnecting link is located at a second current closing position.
As a preferred scheme of the junction box, the junction box further comprises a voltage switch, the voltage switch comprises a voltage static contact and a voltage blade which are fixedly connected to the junction box body, the voltage blade has a voltage open position and a voltage close position, and when the voltage blade is located at the voltage close position, the voltage blade is in contact with the voltage static contact, so that a voltmeter of the voltage transformer is connected to the power line; when the voltage disconnecting link is located at a voltage disconnecting position, the voltage disconnecting link is separated from the voltage static contact and is used for disconnecting the voltmeter from the power line.
As a preferred configuration of the terminal block, the first stopper may lock relative positions of the first current blade, the second current blade, and the voltage blade when the first current blade is located at a first current off position, the second current blade is located at a second current on position, and the voltage blade is located at a voltage on position.
As a preferable embodiment of the terminal box, the terminal box further includes a second limiting member, and when the first current blade is located at a first current closing position and the second current blade is located at a second current opening position, the second limiting member can lock a relative position between the first current blade and the second current blade.
As a preferred configuration of the terminal block, the second limiting member is capable of locking a relative position between the first current blade, the second current blade, and the voltage blade when the first current blade is located at a first current-on position, the second current blade is located at a second current-off position, and the voltage blade is located at a voltage-off position.
As a preferable configuration of the terminal box, the terminal box further includes a first current blade handle connected to the first current blade, the terminal box further includes a second current blade handle connected to the second current blade, and the terminal box further includes a voltage blade handle connected to the voltage blade; the first limiting member is a first pin, and when the first current blade is located at a first current off position, the second current blade is located at a second current on position, and the voltage blade is located at a voltage on position, the first pin can sequentially pass through the voltage knife handle, the first current knife handle and the second current knife handle.
In a preferred embodiment of the terminal box, the second limiting member is a second pin, and when the first current blade is located at a first current-on position, the second current blade is located at a second current-off position, and the voltage blade is located at a voltage-off position, the second pin can sequentially pass through the voltage knife handle, the first current knife handle, and the second current knife handle.
Preferably, the first pin and the second pin are different in size.
Preferably, the voltage switch handle, the first current switch handle and the second current switch handle are provided with identifiers, respectively.
In a preferred embodiment of the junction box, the first current switch is located between the voltage switch and the second current switch.
The invention has the beneficial effects that:
when the first current knife switch blade is located at the first current disconnection position and the second current knife switch blade is located at the second current closing position, the first current knife switch blade is separated from the first current fixed contact, the second current knife switch blade is separated from the second current fixed contact, the ammeter is disconnected from the power line, and the ammeter normally operates and is used for measuring the current of the power line. When the first current blade is located at the first current closing position and the second current blade is located at the second current opening position, the first current blade is in contact with the first current fixed contact and used for enabling the ammeter to be in short circuit, the second current blade is separated from the second current fixed contact and used for enabling the ammeter to be disconnected with the power line, and at the moment, a maintainer can replace the ammeter under the condition that the power line normally runs. The relative position between the first current knife switch blade and the second current knife switch blade is locked through the first limiting part, so that the damage or the accuracy reduction of an ammeter caused by the fact that maintenance personnel operate one of the switches independently due to mistaken touch can be prevented.
Drawings
FIG. 1 is a schematic structural diagram of a junction box according to a first embodiment of the invention;
FIG. 2 is a schematic front view of a junction box according to a first embodiment of the present invention;
FIG. 3 is a schematic side view of a junction box according to one embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of the junction box connected to the power line in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a first current stationary contact, a second current stationary contact, or a voltage stationary contact according to a first embodiment of the present invention;
fig. 6 is a schematic front view of a first current stationary contact, a second current stationary contact, or a voltage stationary contact according to a first embodiment of the present invention.
In the figure:
1. a junction box body;
2. a voltage switch; 21. a voltage static contact; 22. a voltage blade; 23. a voltage knife switch handle;
3. a first current switch; 31. a first current stationary contact; 32. a first current blade; 33. a first current knife switch handle;
4. a second current switch; 41. a second current stationary contact; 42. a second current blade; 43. a second current knife switch handle;
5. a first pin; 51. a first pin connection hole; 52. a second pin connection hole;
6. a slot; 61. a side wall; 62. a guide portion.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
Before the ammeter is replaced, the ammeter needs to be short-circuited, and the open circuit cannot occur. Therefore, before replacing the ammeter, the ammeter needs to be short-circuited and then replaced. The two steps are usually controlled by using separate switches, and the two switches are not allowed to be operated mistakenly when the ammeter is not replaced. However, in the operation and maintenance process of the power line, an operator often operates one of the switches by mistake, which results in damage to the current transformer or reduced accuracy.
In order to solve the above problems, the present embodiment provides a junction box, which can limit the relative displacement between two current knife blades, prevent one of the switches from being operated by mistake, and simultaneously can realize the replacement of an ammeter in the normal operation state of a power line, and can be used in the technical field of power metering equipment.
FIG. 1 is a schematic view of a junction box according to an embodiment of the present invention; FIG. 2 shows a schematic front view of a junction box in an embodiment of the invention; figure 3 shows a schematic side view of a junction box in an embodiment of the invention. Referring to fig. 1 to 3, the junction box includes a junction box body 1, a first current switch 3, a second current switch 4, and a first limiting member. The first current switch 3 includes a first current blade 32 and a first current stationary contact 31 fixedly connected to the junction box body 1, and the first current blade 32 may be connected to the junction box body 1 or connected to other devices, which is not limited herein. The second current switch 4 includes a second current blade 42 and a second current stationary contact 41 fixedly connected to the junction box body 1, and similarly, the second current blade 42 may be connected to the junction box body 1, or may be connected to other devices, which is not limited thereto.
Fig. 4 shows a schematic circuit diagram of the connection of the junction box to the power line in the embodiment of the invention. Referring to fig. 1-4, the first current blade 32 has a first current open position and a first current closed position, and the second current blade 42 has a second current open position and a second current closed position. The first current knife-switch blade 32 and the first current fixed contact 31 are respectively connected to two ends of an ammeter of a current transformer, and the second current knife-switch blade 42 and the second current fixed contact 41 are connected to a circuit where the ammeter is located, that is, the first current knife-switch blade 32 and the first current fixed contact 31 are connected in parallel with the ammeter, and the second current knife-switch blade 42 and the second current fixed contact 41 are connected in series with the ammeter. When the first current blade 32 is located at the first current off position, the first current blade 32 is separated from the first current stationary contact 31; when the second current blade 42 is located at the second current closing position, the second current blade 42 contacts the second current stationary contact 41, so that the ammeter is connected to the power line, and the ammeter operates normally, and can detect the current of the power line.
With continued reference to fig. 1-4, since the ammeter does not allow an open circuit situation, when the first current blade 32 is in the first current closed position, the first current blade 32 is in contact with the first current stationary contact 31 for short-circuiting the ammeter; when the second current blade 42 is located at the second current disconnecting position, the second current blade 42 is separated from the second current stationary contact 41, for disconnecting the ammeter from the power line. At the moment, the power line normally runs, and meanwhile, maintenance personnel can replace the ammeter.
Referring to FIG. 4, an ammeter IAAnd the control process of the switch is described by taking the circuit as an example. In an ammeter IAIn normal operation, the first current blade 32 is in a first current off position, i.e. in connection with the ammeter IAThe parallel first current blade 32 is separated from the first current stationary contact 31, while the second current blade 42 is in the second current closed position, i.e. in connection with the ammeter IAThe second current knife-blade 42 connected in series contacts with the second current stationary contact 41, so that the ammeter IAAnd the device is connected to a power line and is not short-circuited, so that the device can normally operate. When the ammeter I needs to be replacedAIn the meantime, the first current knife switch 32 is first adjusted to the first current closed position to make the ammeter IAShort-circuited, and then connected in seriesIn an ammeter IAThe second current blade 42 is adjusted to the second current off position, at this time, the normal operation of the power line is not affected, and the current transformer is not damaged, and meanwhile, the maintenance personnel can replace the ammeter IA。
With continued reference to fig. 1-3, the terminal box further includes a first limiting member capable of locking a relative position between the first current blade 32 and the second current blade 42 when the first current blade 32 is in the first current open position and the second current blade 42 is in the second current closed position. Therefore, under the condition that the ammeter works normally, the relative displacement between the first current knife-switch blade 32 and the second current knife-switch blade 42 is limited, and damage or accuracy reduction of the ammeter caused by singly operating one of the switches due to mistaken touch of maintenance personnel is prevented.
With continued reference to fig. 1-3, the terminal box further includes a second limiting member capable of locking a relative position between the first current blade 32 and the second current blade 42 when the first current blade 32 is in the first current closed position and the second current blade 42 is in the second current open position. When the ammeter is replaced, the relative displacement between the first current knife switch blade 32 and the second current knife switch blade 42 can be limited, and the damage of the current transformer caused by disconnecting a line or connecting the ammeter to a power line when the replacement and debugging of the ammeter are not completed is prevented.
With continued reference to fig. 1-3, the junction box further includes a voltage switch 2, the voltage switch 2 includes a voltage stationary contact 21 and a voltage blade 22 fixedly connected to the junction box body 1, and the voltage blade 22 may be connected to the junction box body 1 or to other devices, which is not limited thereto. The voltage disconnecting link 22 and the voltage static contact 21 are connected in series with a voltmeter, the voltage disconnecting link 22 has a voltage open position and a voltage close position, when the voltage disconnecting link 22 is located at the voltage close position, the voltage disconnecting link 22 is in contact with the voltage static contact 21 and is used for connecting the voltmeter of the voltage transformer to a power line, and at the moment, the voltage transformer normally operates; when the voltage disconnecting link 22 is located at the voltage disconnecting position, the voltage disconnecting link 22 is separated from the voltage static contact 21, and the voltmeter is disconnected from the power line, that is, the voltmeter is disconnected, at this time, the power line normally operates, and meanwhile, a maintainer can directly replace the voltmeter.
Continuing to refer to FIG. 4, with voltmeter UAAnd the control process of the switch is described by taking the circuit as an example. Due to the voltmeter UAIn the course of replacement, short-circuit is not allowed, so that the voltage knife blade 22 and the voltage fixed contact 21 and the voltmeter U are not allowed to occurASeries, voltmeter UAAre connected to the live line and the neutral line of the power line, respectively. The voltmeter U is set when the voltage blade 22 is in the voltage-closed position, i.e. the voltage blade 22 is in contact with the voltage-fixed contact 21ANormal operation is carried out; when the voltage blade 22 is in the voltage off position, i.e. the voltage blade 22 is separated from the voltage fixed contact 21, the voltmeter UAOpen circuit, at the moment, maintenance personnel can directly replace the voltmeter UA。
With continued reference to fig. 1-4, in the present embodiment, a three-phase four-wire transformer is used to measure the voltage and current of the power line, and therefore, three ammeters are provided, IA、IB、ICThe three ammeters are respectively connected to the three transformers, the three transformers are respectively arranged in A, B, C live wires in a power line, the first current switch 3 and the second current switch 4 are respectively provided with three ammeters, and the first current switch 3, the second current switch 4 and the ammeter IBAnd ammeter ICConnection and control mode of (1) and ammeter IASimilarly, no further description is given. On the basis, the three first current disconnecting link blades 32 are respectively and rotatably connected to the junction box body 1 and are respectively and rotatably connected with the first current disconnecting link handle 33, and the three second current disconnecting link blades 42 are respectively and rotatably connected to the junction box body 1 and are respectively and rotatably connected with the second current disconnecting link handle 43.
With continued reference to fig. 1-4, in this embodiment, three voltage meters are also provided, each UA、UB、UCAnd one ends of the three voltmeters are respectively connected with A, B, C live wires in the power line, and the other ends of the three voltmeters are respectively connected with a zero wire N in the power line. Four voltage switches 2 are provided, whichThe three voltage switches 2 are respectively connected with three voltmeters, wherein the three voltmeters UBVoltmeter UCConnection and control mode of connected voltage switch 2 and voltmeter UASimilarly, no further description is given. In addition, a further voltage switch 2 is provided on the line connected to the neutral line N. On the basis, the four voltage knife switch blades 22 are respectively and rotatably connected to the junction box body 1 and are respectively and rotatably connected with the voltage knife switch handle 23.
With continued reference to fig. 1-3, the junction box further includes a first current blade handle 33 connected to the first current blade 32, the junction box further includes a second current blade handle 43 connected to the second current blade 42, and the junction box further includes a voltage blade handle 23 connected to the voltage blade 22. Optionally, the first current knife handle 33, the second current knife handle 43 and the voltage knife handle 23 are made of insulating materials, such as plastic, rubber, etc., so as to prevent the risk of electric shock to the operator.
With continued reference to fig. 1-3, when the first current blade 32 is in the first current open position, the second current blade 42 is in the second current closed position, and the voltage blade 22 is in the voltage closed position, the ammeter and the voltmeter both operate normally, and the first limiting member can lock the relative positions of the first current blade 32, the second current blade 42, and the voltage blade 22. Make ampere meter and voltmeter under normal operating condition, operating personnel can't the arbitrary knife switch piece of independent operation, prevent because of the damage or the measurement inaccuracy of the ampere meter or the voltmeter that the mistake touched the lead to.
Specifically, the first limiting member is a first pin 5, and when the first current blade 32 is located at the first current open position, the second current blade 42 is located at the second current closed position, and the voltage blade 22 is located at the voltage closed position, the first pin 5 can sequentially pass through the voltage blade handle 23, the first current blade handle 33, and the second current blade handle 43. The voltage knife handle 23, the first current knife handle 33 and the second current knife handle 43 each have a first pin connection hole 51 for mating with the first pin 5.
With continued reference to fig. 1-3, when the first current blade 32 is in the first current closed position, the second current blade 42 is in the second current open position, and the voltage blade 22 is in the voltage open position, the ammeter and the voltmeter are disconnected from the power line and are in a detachable and replaceable state, and the second limiting member can lock the relative positions of the first current blade 32, the second current blade 42, and the voltage blade 22. The knife switch blade can not be independently operated by an operator when the replacement operation is not finished, and the condition that the corresponding switch is closed or opened when the replacement of the ammeter or the voltmeter is not finished, and the damage of the ammeter or the voltmeter is further caused is prevented.
Specifically, the second limiting member is a second pin, and when the first current blade 32 is located at the first current-on position, the second current blade 42 is located at the second current-off position, and the voltage blade 22 is located at the voltage-off position, the second pin can sequentially pass through the voltage knife handle 23, the first current knife handle 33, and the second current knife handle 43. The voltage switch handle 23, the first current switch handle 33 and the second current switch handle 43 each have a second pin connection hole 52 for mating with a second pin.
With continued reference to fig. 1-3, the first pin 5 is of a different size than the second pin, such that the first pin connection hole 51 for mating with the first pin 5 and the second pin connection hole 52 for mating with the second pin are of a different size, which can prevent an operator from misinsertion of different connection holes when using the first pin 5 and the second pin.
With continued reference to fig. 1-3, identifiers are respectively disposed on the voltage knife switch handle 23, the first current knife switch handle 33, and the second current knife switch handle 43 for identification, so as to remind an operator of corresponding functions of different switches and reduce the occurrence of erroneous operation.
With continued reference to fig. 1-3, during the replacement of the electric meter, the replacement of the voltmeter is relatively independent from the replacement of the ammeter, and optionally, in this embodiment, the first current switch 3 is disposed between the voltage switch 2 and the second current switch 4, and an operator may sequentially operate the voltage switch 2, the first current switch 3, and the second current switch 4, so as to sequentially replace the voltmeter and the ammeter.
Fig. 5 is a schematic structural diagram illustrating a first current stationary contact, a second current stationary contact, or a voltage stationary contact according to an embodiment of the present invention; fig. 6 is a schematic front view illustrating a first current stationary contact, a second current stationary contact, or a voltage stationary contact according to an embodiment of the present invention. Referring to fig. 1, 5 and 6, the voltage fixed contact 21 has a slot 6, and when the voltage disconnecting link 22 is located at the closed position, it can be inserted into the slot 6 of the voltage fixed contact 21 and abut against the sidewall 61 of the slot 6. Preferably, the slot 6 has two side walls 61, the two side walls 61 are parallel and spaced apart, and the width of the voltage blade 22 along the normal direction of the side walls 61 is equal to the spacing between the two side walls 61. Further preferably, the slot 6 further has two guiding portions 62, the two guiding portions 62 are respectively connected to the two side walls 61, and the distance between the two guiding portions 62 and the opening of the slot 6 is greater than the distance between the two guiding portions 62 and the bottom wall of the slot 6, so as to guide the voltage disconnecting link 22 into the slot 6. Optionally, the first current stationary contact 31 and the second current stationary contact 41 also adopt similar structures, and are not described herein again.
The following describes in detail the method for replacing the voltmeter and ammeter when the junction box of the present embodiment is used with reference to fig. 1 to 6.
When both the voltmeter and the ammeter are operating normally, the voltage blade 22 is in the voltage on position, the first current blade 32 is in the first current off position, and the second current blade 42 is in the second current on position, while the first pin 5 passes through the voltage knife handle 23, the first current knife handle 33, and the second current knife handle 43 in sequence.
When the maintenance personnel need to replace the voltmeter, the first pin 5 is pulled out from the voltage knife handle 23, and the first pin 5 still passes through the first current knife handle 33 and the second current knife handle 43. At this time, the operator can control the voltage knife switch handle 23 and the voltage knife switch 22 independently, and adjust the voltage knife switch 22 to a voltage off position to break the voltmeter, and then replace the voltmeter. If the maintenance personnel need to replace the ammeter at the same time, the first pin 5 is continuously pulled out from the first current knife switch handle 33, or the first pin 5 is completely pulled out, the limitation on the relative displacement between the first current knife switch 32 and the second current knife switch 42 is removed, and the operation personnel only need to adjust the first current knife switch 32 to the first current closing position, then adjust the second current knife switch 42 to the second current opening position in sequence, and replace the ammeter.
At this time, the voltage blade 22 is in the voltage off position, the first current blade 32 is in the first current on position, and the second current blade 42 is in the second current off position, and in order to prevent an erroneous operation, a second pin is inserted through the voltage knife handle 23, the first current knife handle 33, and the second current knife handle 43 in this order.
After the replacement of the voltmeter and the ammeter is completed, the second pin is firstly pulled out from the second current knife switch handle 43, the second current knife switch 42 is adjusted to the second current closed position, so that the ammeter is connected to the power line, then the second pin is pulled out or completely pulled out from the first current knife switch handle 33, the first current knife switch 32 is operated and positioned at the first current open position, and then the voltage knife switch 22 is operated and positioned at the voltage closed position, so that the voltmeter is connected to the power line, and the installation of the voltmeter and the ammeter is completed. Finally, the first pin 5 passes through the voltage knife switch handle 23, the first current knife switch handle 33 and the second current knife switch handle 43 in sequence, so that the relative positions are kept fixed. Therefore, the disassembly, assembly and replacement of the voltmeter and the ammeter can be completed under the condition of no power failure, and the later maintenance is facilitated.
Example two
This embodiment provides a junction box, which is substantially the same as the junction box of the first embodiment except that: the relative positions of the voltage switch 2, the first current switch 3 and the second current switch 4 are different.
With continued reference to fig. 4, in this embodiment, the second current switch 4 is located between the voltage switch 2 and the first current switch 3. Since the assembly and disassembly of the voltmeter are relatively independent from the ammeter, and the first current blade 32 must be adjusted before the second current blade 42 must be adjusted when the ammeter is replaced, the operation sequence is not allowed to be wrong. When the second current switch 4 is provided between the voltage switch 2 and the first current switch 3, the first pin 5 is first pulled out from the first current blade 33 and then the first current blade 32 is operated when the replacement operation of the ammeter and the voltmeter is performed. At this time, the first pin 5 still penetrates through the second current blade 42 and the voltage blade 22, so that the relative displacement between the second current blade 42 and the voltage blade 22 can be limited, and the second current blade 42 is prevented from being touched by an operator by mistake before the operation of the first current blade 32 is completed, so that the operation sequence is wrong, and the ammeter or the mutual inductor is damaged.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A junction box, comprising:
a junction box body (1);
the first current switch (3) comprises a first current disconnecting link (32) and a first current static contact (31) fixedly connected to the junction box body (1), the first current disconnecting link (32) is provided with a first current opening position and a first current closing position, and when the first current disconnecting link (32) is located at the first current closing position, the first current disconnecting link (32) is in contact with the first current static contact (31) and used for enabling an ammeter of a current transformer to be short-circuited; when the first current blade (32) is in a first current off position, the first current blade (32) is separated from the first current stationary contact (31);
the second current switch (4) comprises a second current disconnecting link (42) and a second current static contact (41) fixedly connected to the junction box body (1), the second current disconnecting link (42) has a second current open position and a second current closed position, and when the second current disconnecting link (42) is located at the second current closed position, the second current disconnecting link (42) is in contact with the second current static contact (41) and used for connecting the ammeter to a power line; when the second current blade (42) is located at a second current disconnection position, the second current blade (42) is separated from the second current static contact (41) and is used for disconnecting the ammeter from the power line;
a first limiting member capable of locking a relative position between the first current blade (32) and the second current blade (42) when the first current blade (32) is in a first current open position and the second current blade (42) is in a second current closed position.
2. The junction box according to claim 1, further comprising a voltage switch (2), wherein the voltage switch (2) comprises a voltage stationary contact (21) and a voltage blade (22) fixedly connected to the junction box body (1), the voltage blade (22) having a voltage open position and a voltage closed position, when the voltage blade (22) is in the voltage closed position, the voltage blade (22) is in contact with the voltage stationary contact (21) for connecting a voltmeter of a voltage transformer to the power line; when the voltage disconnecting link (22) is located at a voltage disconnection position, the voltage disconnecting link (22) is separated from the voltage static contact (21) and used for disconnecting the voltmeter from the power line.
3. The junction box according to claim 2, wherein the first stop is capable of locking the relative position between the first current blade (32), the second current blade (42) and the voltage blade (22) when the first current blade (32) is in a first current open position, the second current blade (42) is in a second current closed position and the voltage blade (22) is in a voltage closed position.
4. The junction box according to claim 2, further comprising a second stop capable of locking the relative position between the first current blade (32) and the second current blade (42) when the first current blade (32) is in the first current closed position and the second current blade (42) is in the second current open position.
5. The junction box according to claim 4, characterized in that the second limit member is capable of locking the relative position between the first current blade (32), the second current blade (42) and the voltage blade (22) when the first current blade (32) is in a first current closed position, the second current blade (42) is in a second current open position and the voltage blade (22) is in a voltage open position.
6. The junction box according to claim 4 or 5, further comprising a first current blade handle (33) connected to the first current blade (32), a second current blade handle (43) connected to the second current blade (42), a voltage blade handle (23) connected to the voltage blade (22); the first limiting part is a first pin (5), when the first current knife switch piece (32) is located at a first current off position, the second current knife switch piece (42) is located at a second current on position, and when the voltage knife switch piece (22) is located at a voltage on position, the first pin (5) can sequentially pass through the voltage knife switch handle (23), the first current knife switch handle (33) and the second current knife switch handle (43).
7. The junction box according to claim 6, wherein the second limiting member is a second pin that is capable of passing through the voltage blade handle (23), the first current blade handle (33) and the second current blade handle (43) in sequence when the first current blade (32) is in the first current closed position, the second current blade (42) is in the second current open position, and the voltage blade (22) is in the voltage open position.
8. The junction box according to claim 7, characterized in that said first pin (5) is of a different size than said second pin.
9. The junction box according to claim 6, characterized in that identifiers are provided on the voltage knife handle (23), the first current knife handle (33) and the second current knife handle (43), respectively.
10. Junction box according to claim 2, characterized in that the first current switch (3) is located between the voltage switch (2) and the second current switch (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111489229.2A CN114141567B (en) | 2021-12-08 | 2021-12-08 | Junction box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111489229.2A CN114141567B (en) | 2021-12-08 | 2021-12-08 | Junction box |
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| CN114141567B CN114141567B (en) | 2023-06-23 |
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| CN202616126U (en) * | 2012-05-31 | 2012-12-19 | 西安博隆电气有限责任公司 | Novel outdoor AC high-voltage isolation switch |
| CA2899978A1 (en) * | 2014-03-14 | 2014-10-02 | General Equipment And Manufacturing Company, Inc., D/B/A Topworx, Inc. | Quick disconnect connector assembly |
| US20150021298A1 (en) * | 2013-07-19 | 2015-01-22 | Hitachi, Ltd. | Switchgear |
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| CN111863498A (en) * | 2020-08-27 | 2020-10-30 | 国网浙江省电力有限公司检修分公司 | Fast switching operation mechanism |
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2021
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| CN202616126U (en) * | 2012-05-31 | 2012-12-19 | 西安博隆电气有限责任公司 | Novel outdoor AC high-voltage isolation switch |
| US20150021298A1 (en) * | 2013-07-19 | 2015-01-22 | Hitachi, Ltd. | Switchgear |
| CA2899978A1 (en) * | 2014-03-14 | 2014-10-02 | General Equipment And Manufacturing Company, Inc., D/B/A Topworx, Inc. | Quick disconnect connector assembly |
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| CN114141567B (en) | 2023-06-23 |
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