CN113687120A

CN113687120A - Lossless meter changing device and meter changing method

Info

Publication number: CN113687120A
Application number: CN202110857963.3A
Authority: CN
Inventors: 张家利; 过福兴; 盛继光
Original assignee: Hangzhou Join Electric Technology Co ltd
Current assignee: Hangzhou Join Electric Technology Co ltd
Priority date: 2021-07-28
Filing date: 2021-07-28
Publication date: 2021-11-23
Anticipated expiration: 2041-07-28
Also published as: CN113687120B

Abstract

The invention provides a lossless table changing device, which comprises: the base is provided with two rows of meter inserting columns side by side, two groups of inserting sleeves are respectively arranged in the two rows of meter inserting columns, the inserting sleeves in the two groups of inserting sleeves, which correspond to each other, are connected with each other through a conductive connecting piece, and the base is also provided with a wiring part for connecting a secondary circuit; the first plug and the second plug respectively comprise a plug shell and an inserting core arranged in the plug shell, a group of inserting pins corresponding to the inserting sleeve are arranged on the inserting core, and a wire inlet part used for connecting a meter is arranged on the plug shell; the base is also provided with an interlocking mechanism which limits the plug to be pulled out when only the first plug or the second plug is plugged on the base and releases the limitation when the first plug and the second plug are plugged on the base simultaneously. The invention also provides a lossless replacing method using the lossless table replacing device.

Description

Lossless meter changing device and meter changing method

Technical Field

The invention relates to the technical field of power equipment, in particular to a lossless meter changing device and a meter changing method.

Background

The multifunctional electric energy meter is an electric energy meter which has more than two functions of time sharing, demand measurement and the like besides active (reactive) measurement, and can display, store and output data. For the replacement of the multifunctional electric energy meter, the conventional replacement mode is to short-circuit the secondary circuit of the current transformer by operating the joint junction box, disconnect the secondary circuit of the voltage transformer, remove the old running meter, replace the new meter and then perform field test. Throughout the replacement process, skilled workers may take approximately 30 minutes, while unskilled workers may take longer. In the replacement process, the electric energy meter cannot measure due to the short circuit of the secondary circuit of the current transformer and the disconnection of the secondary circuit of the voltage transformer at the electric energy meter, and the network loss and the line loss are increased and distorted when a measuring point is checked, so that the checking and analysis of the line loss are influenced, and the considerable loss can be caused to a power supply enterprise when the electric quantity of the measuring point is settled.

Therefore, Chinese patent No. CN110542772A discloses a device and a method for replacing a nondestructive electric energy meter, which solves the problem of power supply enterprise loss caused by incapability of measuring the electric quantity during replacement of the existing multifunctional electric energy meter. According to the replacing method, secondary current is shunted in an operating electric energy meter loop, a first electric energy meter mounting plug-in and a second electric energy meter mounting plug-in are installed in the secondary current loop in parallel, the two electric energy meter mounting plug-ins are respectively used for installing an electric energy meter to be replaced and a replaced electric energy meter, in the process of replacing the electric energy meters, the electric energy meter to be replaced and the replaced electric energy meter are alternately installed through the two electric energy meter mounting plug-ins, a secondary current operating loop of one electric energy meter is disconnected, a secondary operating loop of the other electric energy meter is connected with the operating electric energy meter loop, uninterrupted metering is achieved, and therefore lossless replacement is achieved.

However, the device for lossless replacement of the electric energy meter is only an external device, and during meter replacement operation, a first meter position of a new meter on the device needs to be installed firstly, then a lead of the device is connected to an original combined junction box, then an old meter is removed and inserted into a second meter position, then the new meter is removed from the device and installed in a power distribution cabinet, then the old meter is removed from the device, and finally a lead of the device is removed from the original combined junction box. In the operation process, the lead connecting and disconnecting is electrified, and screws need to be electrified, so that certain danger exists. In addition, in the actual operation, the problems of inconvenient operation, time waste and labor waste still exist.

Disclosure of Invention

The invention aims to provide a lossless meter changing device to overcome the defects that the conventional combined junction box or lossless meter changing device is inconvenient to operate and cannot prevent misoperation.

A lossless meter change apparatus, comprising:

the base is provided with two rows of meter inserting columns side by side, two groups of inserting sleeves are respectively arranged in the two rows of meter inserting columns, the inserting sleeves in the two groups of inserting sleeves, which correspond to each other, are connected with each other through a conductive connecting piece, and the base is also provided with a wiring part for connecting a secondary circuit;

the first plug and the second plug respectively comprise a plug shell and an inserting core arranged in the plug shell, a group of inserting pins corresponding to the inserting sleeve are arranged on the inserting core, and a wire inlet part used for connecting a meter is arranged on the plug shell;

the base is also provided with an interlocking mechanism which limits the plug to be pulled out when only the first plug or the second plug is plugged on the base and releases the limitation when the first plug and the second plug are plugged on the base simultaneously.

Furthermore, a third row of terminal plug-in posts which are parallel to the two rows of meter plug-in posts are arranged on the base, a third group of plug bushes which correspond to the positions of the plug bushes in the meter plug-in posts are arranged in the terminal plug-in posts, and at least part of the plug bushes in the third group of plug bushes are in short circuit through short-circuit elastic sheets; the third plug comprises a plug shell and a terminal insertion core arranged in the plug shell, a group of contact pins corresponding to the third group of insertion sleeves are arranged on the terminal insertion core, and an insulating partition plate used for separating the short-circuit elastic sheet from the insertion sleeves in an insertion state is further arranged; and the plug shell is provided with a wire inlet part for connecting the intelligent terminal.

Further, the base includes base casing and end cover board, and each row of spliced pole sets up in the front of base casing side by side, the base casing back is equipped with the installation department that corresponds the spliced pole, the plug bush is installed in the spliced pole to by the screw fixation in installation department.

Furthermore, the wiring portion is arranged on the side portion of the base and comprises a plurality of wiring holes and wiring terminals, the wiring holes are formed in the side face of the base and correspond to the insertion columns, the wiring terminals are arranged in the wiring holes, a plurality of grooves are formed in the base corresponding to the wiring holes, and screws used for fixing the wiring terminals are arranged in the grooves.

Further, the back of the base shell is also provided with a wiring groove communicated with the installation part and the wiring part, and the wiring groove is internally provided with a plug bush connected with the corresponding position and a conductive connecting piece connected with a connector lug.

Furthermore, insulating fillers are filled in the wiring grooves and the back of the whole base shell, and the bottom cover plate covers the insulating fillers and is fixedly connected with the base shell through screws.

Furthermore, the plug bushes corresponding to the positions in the meter plug-in post and the terminal plug-in post are respectively connected through a conductive connecting part to form at least a plurality of groups of current-voltage loops and a group of grounding loops, wherein each plug bush in the voltage loop and the connector lug of the corresponding connector lug are connected through the same conductive connecting part, the connector lug in the current flowing loop is directly connected with two plug bushes in the meter plug-in post through the conductive connecting part, the short-circuit elastic piece in the current flowing loop is in short circuit with two adjacent plug bushes in the terminal plug-in post, and the two short-circuit plug bushes are respectively connected with two plug bushes in the meter plug-in post and the corresponding connector lug through the conductive connecting parts.

Furthermore, a first annular enclosure surrounding the two rows of meter inserting columns and a second annular enclosure surrounding the terminal inserting column are arranged on the front face of the base shell, at least part of the first annular enclosure is matched with the shapes of the plug shells of the first plug and the second plug, and at least part of the second annular enclosure is matched with the shape of the third plug.

Furthermore, the first annular enclosure is provided with at least one outer convex part, and the plug shells of the first plug and the second plug are provided with convex parts matched with the outer convex parts in position and shape.

Furthermore, the interlocking mechanism is arranged between the first plug and the second plug and comprises at least one group of elastic clamping mechanisms; the elastic clamping mechanism comprises a first clamping piece and a second clamping piece which are movably arranged on the base and respectively provided with an elastic element, and clamping parts are respectively arranged on the plug shells of the first plug and the second plug; when only the first plug/the second plug is plugged, the first clamping piece/the second clamping piece is clamped with the clamping part on the first plug/the second plug under the action of the elastic element, and when the second plug/the first plug is plugged, the plug shell pushes the first clamping piece/the second clamping piece to overcome the elastic force of the elastic element to generate displacement, so that the first clamping piece/the second clamping piece is separated from the clamping part on the first plug/the second plug.

Furthermore, the clamping part is a clamping groove arranged on the plug shell of the first plug and the second plug, one end of the first clamping piece and one end of the second clamping piece are provided with clamping heads matched with the clamping groove, and the other end of the first clamping piece and the second clamping piece are provided with inclined stress surfaces; when the first plug or the second plug is inserted, the plug shell is in contact with the stress surface and pushes the second clamping piece or the first clamping piece to displace.

Furthermore, a pair of communication plug connectors are arranged on the base, and the communication plug connectors at corresponding positions in the pair of communication plug connectors are connected with each other.

The shell is covered on the base and used for covering the first plug, the second plug and/or the third plug; the shell body is fixedly connected with the base through screws at the connecting parts, and lead seal anti-dismounting structures are arranged on the connecting parts.

Furthermore, the top of the plug shell of the first plug, the second plug and/or the third plug is provided with a plane ridge part which longitudinally penetrates through the whole shell, and a convex beam corresponding to the plane ridge part is arranged inside the outer shell.

The invention also provides a lossless table changing method, which uses the lossless table changing device and specifically comprises the following steps:

during initial installation, the base is connected into the secondary circuit through the wiring part, and meanwhile, the first plug or the second plug is connected with the current usage meter and is inserted into the base;

and (4) when the meter is replaced and timed, connecting the new meter with the second plug or the first plug, inserting the new meter into the base, and then pulling out the originally inserted first plug or second plug to complete replacement.

The invention has the following beneficial effects:

the lossless meter changing device can be respectively connected with the secondary circuit and the meters to be changed and replaced by arranging the independent base and the independent plug, so that the problem of loss of a power supply enterprise caused by incapability of metering the electric quantity when the multifunctional electric energy meter is changed can be solved, the operation convenience is greatly improved, and the replacement operation is convenient for operators. Furthermore, the intelligent terminal can be conveniently connected to measure current and voltage parameters in the secondary loop. Meanwhile, the anti-misplug and anti-disassembly device has the functions of preventing misplug and disassembly, and effectively improves safety.

Drawings

FIG. 1 is an assembly diagram of a non-destructive re-tabulation device of an embodiment of the present invention.

FIG. 2 is a schematic diagram of the front side of the base of the lossless table-changing apparatus according to the embodiment of the present invention.

FIG. 3 is a schematic side view of a base of an embodiment of the non-destructive watch changing apparatus of the present invention.

FIG. 4 is a schematic view of the back of the base of the non-destructive watch-changing apparatus according to the embodiment of the present invention.

FIG. 5 is a schematic diagram of the embodiment of the device for lossless table change of the invention, after the bottom cover is removed from the back of the base.

FIG. 6 is a schematic diagram of an oblique side view of the embodiment shown in FIG. 5.

FIG. 7 is a schematic diagram of the connections of the circuitry within the base of an embodiment of the non-destructive re-metering device of the present invention.

FIG. 8 is a schematic diagram of a first plug structure of an embodiment of a lossless table-changing apparatus according to the invention.

FIG. 9 is a schematic diagram of a third plug structure of the lossless table-changing apparatus according to the embodiment of the present invention.

FIG. 10 is a schematic cross-sectional view of the base of an embodiment of the non-destructive meter changing apparatus of the present invention at the interlocking mechanism.

FIG. 11 is a schematic cross-sectional view of a base with a plug installed at an interlock mechanism of an embodiment of a non-destructive meter changing apparatus of the present invention.

FIG. 12 is a schematic exterior view of the non-destructive meter changer of the present invention with an outer case installed.

Detailed Description

For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.

Referring to the accompanying

drawings

1 and 2, the embodiment of the invention provides a lossless meter changing device, which at least comprises a base 1, wherein a first meter inserting column 11 and a second meter inserting column 12 are arranged on the base 1 side by side, two groups of inserting sleeves are respectively arranged in the two rows of meter inserting columns, and the inserting sleeves corresponding to the positions in the two groups of inserting sleeves are mutually connected in a conductive manner. The plug also at least comprises a first plug 2 and a second plug 3 which are matched with the base 1, wherein the two plugs are respectively provided with a plug core, and the plug core is provided with a group of contact pins which correspond to plug bushes in the plug columns on the base. Meanwhile, the side of the base 1 is provided with a wiring portion 14 for connecting a secondary circuit, and the first plug 2 and the second plug 3 are each provided with a

wiring portion

21, 31 for connecting a meter.

In addition, the base 1 is provided with interlocking means 16a, 16b for restricting the plug from being pulled out when only the first plug or the second plug is plugged in the base, and for releasing the restriction when the first plug and the second plug are plugged in the base at the same time.

In a preferred illustrated embodiment, referring to fig. 4, the base 1 comprises a base housing and a bottom cover plate 5, the bottom cover plate 5 being fixedly mounted to the back of the base housing by screws. Referring to fig. 5-7, the back of the base housing is provided with mounting portions 101 corresponding to meter pegs, through which respective sleeves 102 are mounted in the meter pegs and secured at the mounting portions by screws.

Referring to fig. 1-3 and 6-7, the wiring portion 14 is disposed on a side portion of the base 1, and includes a plurality of wiring holes 141 disposed on a side surface of the base 1, each of which is located at a position corresponding to a position of the meter insertion post and in which a wiring terminal 143 is mounted. Meanwhile, a groove 142 is formed in the base corresponding to each wiring hole 141, and a screw for fixing a wire end is arranged in each groove. By adopting the structure, the screw of the contact connector lug is hidden in the groove, so that the situation of accidental electric shock or short circuit can be avoided as much as possible.

Referring to fig. 5-7, the back of the base housing is provided with a wiring slot 103 for communicating the mounting portion and the wiring portion corresponding to the mounting position, and a conductive connecting member 104 for connecting the plug bush and the connector lug corresponding to the connecting position is installed in the wiring slot 103. The part of the conductive connecting piece 104 connected with the plug bush is designed into a circular ring shape matched with the bottom of the plug bush, and is fixed at the mounting part on the back of the base by a screw and the plug bush in an integrated manner.

When only two rows of plug posts are disposed on the base 1, the corresponding plug bushes in the two rows of plug posts are connected in a one-to-one correspondence manner through the conductive connecting pieces and connected to the corresponding connector lug 143 at the position of the wiring portion 14.

As a further preferred embodiment, in this embodiment, the insulating filler is filled in each wiring groove on the back surface of the base housing and the back surface of the whole base housing, and the bottom cover plate 5 covers the insulating filler after being installed, so as to achieve better insulating and sealing effects, avoid the short circuit caused by the influence of the erosion of each charged component by the environment, and reduce the risk of accidental electric shock.

In a preferred illustrative embodiment, and with reference to fig. 8, the first plug 2 includes a plug housing 22 and a ferrule 23 disposed within the plug housing, the ferrule 23 having a plurality of pins 24 corresponding to the sockets of the surface-counting posts on the base. The ferrule 23 fits snugly within the plug housing 22, and the edge of the plug housing 22 forms a mating groove around the ferrule 23 that mates with the meter posts on the base. There is a wiring space between the back of the ferrule 23 and the plug housing 22, and when the first plug 2 is connected to the meter, the wiring enters the plug housing 22 through the wiring portion 21 and is connected to each pin on the ferrule 23. The ferrule 23 has a plurality of glue stealing holes 231 for manufacturing reasons.

In the present embodiment, the structure of the second header 3 is similar to that of the first header 2, and will not be described in detail.

Referring to fig. 2 and 3, as a further preferred embodiment, in this embodiment, a first annular enclosure 17 surrounding two rows of meter plug-in posts is disposed on the front surface of the base housing, and the overall shape of the first annular enclosure 17 is matched with the shapes of the plug housings of the first plug 2 and the second plug 3, so that when the first plug 2 and the second plug 3 are inserted, the first annular enclosure 17 wraps around the plug housings, which is convenient for alignment when the plugs are inserted, and can also achieve a better shielding and shielding effect.

In a preferred illustrated embodiment, referring to FIG. 2, the interlocking

mechanisms

16a, 16b are located between two rows of meter posts. Specifically, referring to fig. 10, the interlocking mechanism 16a includes a first engaging member 161 and a second engaging member 163 movably mounted in the limiting groove of the base 1, and the two engaging members have the same shape and are mounted at opposite positions. Wherein, one end of the first clamping member 161 is provided with a clamping head 164, and the other end is provided with an inclined stress surface 165. The second clamping piece is similar to the first clamping piece in structure. The bottom of two joint spare is equipped with the erection column respectively, and the cover is equipped with spring 162 on the erection column, and the spring on two joint spare is used for providing opposite direction's elastic force respectively. The structure of the other set of interlocking mechanisms 16b is similar to the structure of interlocking mechanisms 16a and will not be described in detail herein.

Referring to fig. 8, a locking groove 221 is formed in the plug housing 22 of the first plug 2, and when the first plug 2 is inserted into the base, the locking groove 221 is matched with the locking head 164 of the first locking member 161. Similarly, the plug shell on the second plug is also provided with a similar clamping groove.

Referring to fig. 10 (for clarity, the plug is only shown in the housing part), when only the first plug or the second plug is plugged, the first clamping member or the second clamping member is clamped with the clamping groove on the first plug or the second plug under the action of the spring, and at this time, the first plug or the second plug cannot be pulled out alone. And when another plug is also inserted, the plug shell acts on the stress surface inclined at one end of the clamping piece, so that the clamping piece is pushed to overcome the elastic force of the elastic element to generate displacement, and the clamping head at the other end is separated from the clamping groove on the plug shell. At this time, either one of the two plugs can be freely pulled out. And when one of the plugs is pulled out, the clamping piece pushed by the plug returns to the original position again under the action of the elastic force of the spring, so that the clamping head is clamped in the clamping groove on the plug shell again, and the unplugged plug can not be freely pulled out any more.

By adopting the structure, only one plug on the base can not be freely pulled out, and any plug can be freely pulled out when the two plugs are inserted, so that the open circuit of the current secondary loop caused by the fact that all the plugs are pulled out is effectively prevented.

As a further preferred embodiment, referring to fig. 1-3, in this embodiment, the base 1 is further provided with a third row of terminal plugging columns 13 arranged side by side with the two rows of meter plugging columns, and the terminal plugging columns are provided with a third set of plug bushes corresponding to the plug bushes in the meter plugging columns. In addition, at least some of the sockets of the third group of sockets, see fig. 2 and 7, are shorted by a shorting structure 131. Specifically, the short circuit structure 131 includes a self-shorting elastic sheet 132 and a supporting protection structure thereof.

Referring to fig. 5-7, the plug bushes corresponding to the plug-in posts on the base 1 and the plug-in posts of the terminal are respectively connected by conductive connection parts to form a plurality of current-voltage loops and a plurality of grounding loops. Referring to fig. 7, each plug bush in one group of voltage loops 191 and the connector lug of the corresponding connection portion are connected through the same conductive connecting piece, the connector lug in the current flowing loop 192 is directly connected with two plug bushes in the meter plug-in post through the conductive connecting piece, the short-circuited elastic piece 132 in the current flowing

loops

193 and 194 short-circuits two adjacent plug bushes in the terminal plug-in post, and the two short-circuited plug bushes are respectively connected with two plug bushes in the meter plug-in post and the corresponding connector lug through the conductive connecting pieces. The ground circuit 195 is similar to the voltage circuit 191 in that each plug bush and the connector lug of the corresponding connector portion are connected by the same conductive connector.

Referring to fig. 9, the third plug 4 corresponding to the third row of terminal pins 13 also includes a plug housing 42 and a terminal ferrule 43 disposed in the plug housing 42, wherein the terminal ferrule 43 is provided with a plurality of pins 44 corresponding to the terminal pin sleeves of the terminal pins on the base. The terminal ferrule 43 fits snuggly within the plug housing 42, and the edge of the plug housing 42 forms a mating groove around the terminal ferrule 43 that mates with the terminal posts on the base. There is a wiring space between the back of the terminal insertion core 43 and the plug housing 42, when the third plug 4 is connected to the intelligent terminal, the connection wires enter the plug housing 42 through the wiring portion 41 and are connected to the pins on the terminal insertion core 43 respectively. In addition, the terminal insertion core 43 is further provided with an insulating partition plate 45 for separating the short-circuit elastic sheet and the insertion sleeve which are contacted with each other between the terminal insertion columns in the insertion state. When the third plug 4 is not inserted, two contact pins of the short-circuit elastic sheet 132 are contacted with the plug bushes on two sides so as to short-circuit two adjacent plug bushes in the terminal plug-in column; when the third plug 4 is inserted, the insulating partition 45 is inserted between the two contact pins of the short-circuit elastic piece 132 and the plug bush in contact with the contact pins, so as to isolate the contact between the two contact pins and the plug bush, and eliminate the short-circuit state of the adjacent plug bushes. When the third plug is pulled out again, the short-circuit elastic piece 132 automatically restores the short-circuit state.

As a further preferred embodiment, and with reference to fig. 1-3, the base 1 is further provided with a second annular enclosure 18 surrounding the terminal stud 13, the second annular enclosure 18 being shaped to match the outer shape of the plug housing 42 of the third plug 4. Therefore, when the third plug 4 is inserted into the base, the second annular enclosure 18 wraps around the third plug shell, so that alignment is facilitated when the plug is inserted, and a good shielding and shielding effect can be achieved.

As a further preferred embodiment, in order to prevent the first plug 2 or the second plug 3 from being erroneously inserted into the terminal post due to the proximity of the three plugs in shape and size, referring to fig. 2 and 3, an outer protrusion 171 is provided on both sides of the first annular rail 17 at positions corresponding to both ends of the plugs, and correspondingly, protrusions 223 are provided on the plug housings of the first plug 2 and the second plug 3 at positions and shapes matching with the outer protrusions 171. The second annular skirt 18 is not of a similar design, so that the first plug 2 or the second plug 3 cannot be inserted because of the blocking of the projection 223. On the other hand, because the insulating partition 45 is arranged on the plug core of the third plug 4, and the connecting blocking pieces 112 are arranged between the adjacent plug posts in the two rows of meter plug posts 11 and 12, the third plug 4 cannot be inserted onto the two rows of meter plug posts by mistake, thereby avoiding the risk of incorrect insertion to the maximum extent.

The following describes in detail the operation and working principle of the lossless table-changing device of the present invention:

when the nondestructive meter changing device is used, the base is fixedly arranged in a meter box or an electrical cabinet and is connected into a secondary circuit through a wiring part on the base. Specifically, taking three-phase power as an example, the wiring mode is that three groups of lines are respectively connected with one-phase circuit, each group of lines comprises one path of voltage, one path of current inflow and one path of current outflow, and in addition, one path of voltage grounding is also included. Meanwhile, the first plug (or the second plug) is connected with the meter which is currently used (to be replaced) and is plugged on the base. Specifically, the first plug (or the second plug) is connected with the meter through the wiring part, and the wiring sequence of the internal contact pins is consistent with the wiring sequence of each wiring head of the wiring part on the base. Thus, the meter currently in use (to be replaced) can be connected in the secondary circuit via the plug-base, achieving the normal metering function.

When the meter timing needs to be replaced, a new meter (replacing meter) is connected with a second plug (or a first plug) (the wiring sequence is consistent with the wiring sequence of each wiring head of the wiring part on the base), and then the second plug (or the first plug) is inserted on the base. At the moment, the plug bushes at the corresponding positions in the plug columns of the two rows of meters are connected with each other, so that the new meter and the old meter which are connected with the base through the plug are in parallel connection, at the moment, the new meter and the old meter simultaneously measure the secondary circuit, and the measurement results of the new meter and the old meter are added to obtain the measurement data of the whole secondary circuit.

After other procedures are finished, the first plug (or the second plug) connected with the meter currently used (to be replaced) is pulled down, so that the secondary circuit can be independently and normally metered by the new meter (the replaced meter), and the meter replacing operation is finished.

The lossless meter changing device can realize uninterrupted lossless metering, avoids the loss of power supply enterprises caused by metering incapability or inaccurate metering in the meter changing process, has simple, convenient and quick working procedures in the whole operating process, can greatly improve the meter changing efficiency, reduces the operation difficulty of workers, and avoids the accidental risk in the meter changing process.

In some cases, it is also necessary to measure the current-voltage parameter in the secondary loop by means of a smart terminal. At this time, the intelligent terminal is connected with a third plug of the lossless meter-changing device (the wiring sequence is consistent with the wiring sequence of each connector lug of the wiring part on the base), and then the third plug is inserted into the base. At the moment, the insulating partition plate on the third plug insertion core is inserted between the two contact pins of the short-circuit elastic sheet and the insertion sleeve contacted with the contact pins, so that the contact between the two contact pins and the insertion sleeve is isolated, the current flowing out of the loop enters the intelligent terminal through the third plug (the voltage is accessed through the voltage loop), and the measurement of the current and voltage parameters in the loop is realized. When the measurement is finished or the measurement is not needed, the third plug is pulled out, the short-circuit elastic sheet can automatically short-circuit the current flowing out of the two plug bushes in the loop, and the whole current loop is kept not to be disconnected.

By adopting the scheme, the measurement of the current and voltage parameters in the secondary circuit can be conveniently realized, additional wiring is not needed, the operation is convenient, and the open circuit of the secondary circuit caused by misoperation can be effectively avoided.

As a further preferred embodiment, referring to fig. 1-3, the base 1 is further provided with a pair of communication plugs 15, the pair of communication plugs comprises two communication plugs 151, 152, and the communication plugs at corresponding positions in the two communication plugs 151, 152 are connected with each other.

When the base is installed, a communication line in the meter box or the electric appliance cabinet can be connected with one of the communication plug connectors, and when the communication line needs to be connected, the communication plug is directly connected with the other communication plug, so that the connection can be conveniently realized.

As a further preferred embodiment, referring to fig. 12, the non-destructive meter changing device in this embodiment further includes an outer casing 5 covering the entire base and covering the plug-in post on the base, the plug on the base and the communication connector. Further, the outer shell is fixedly connected with the base through screws at the connecting part 51, and a lead sealing anti-dismounting structure is arranged on the connecting part.

By adopting the structure, after the base is installed at the beginning and the current meter is connected through the first plug (the second plug), the outer shell 5 is covered and the lead seal anti-dismounting structure is arranged, so that irrelevant personnel can be prevented from carrying out dismounting operation. When the meter timing needs to be replaced, the lead seal anti-disassembly structure is removed, the outer shell is disassembled, and then the meter replacement or related measurement operation can be carried out. After the operation is completed, the outer shell 5 is covered again and a lead seal anti-dismounting structure is arranged.

As a further preferred embodiment, referring to fig. 1, the top of the plug housing of the first, second and third plugs is provided with a planar ridge extending across the entire housing, and the inside of the corresponding outer housing 5 is provided with a protruding beam corresponding to the planar ridge, so that the plug can be pressed against being released after the outer housing 5 is mounted on the base. Additionally, referring to fig. 8 and 9, a planar ridge on the plug housing extends to the plug tip and protrudes to form a catch 222 to facilitate plugging and unplugging of the plug.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A lossless table change apparatus, comprising:

2. The device of claim 1, wherein the base is further provided with a third row of terminal plug-in posts which are arranged side by side with the two rows of meter plug-in posts, a third group of plug-in sleeves corresponding to the positions of the plug-in sleeves of the meter plug-in posts are arranged in the terminal plug-in posts, and at least part of the plug-in sleeves of the third group of plug-in sleeves are in short circuit through short-circuit elastic pieces; the third plug comprises a plug shell and a terminal insertion core arranged in the plug shell, a group of contact pins corresponding to the third group of insertion sleeves are arranged on the terminal insertion core, and an insulating partition plate used for separating the short-circuit elastic sheet from the insertion sleeves in an insertion state is further arranged; and the plug shell is provided with a wire inlet part for connecting the intelligent terminal.

3. A non-destructive watch changing device as claimed in claim 1 or 2, wherein said base comprises a base housing and a bottom cover plate, wherein each row of said plug posts are arranged side by side on a front surface of said base housing, a mounting portion corresponding to said plug posts is arranged on a back surface of said base housing, and said plug sleeves are mounted in said plug posts and fixed to said mounting portion by screws.

4. A lossless timepiece changing apparatus as claimed in claim 3, wherein the wiring portion is provided on a side portion of the base, and includes a plurality of wiring holes provided on a side surface of the base and corresponding to the insertion posts, and a plurality of terminals provided in the wiring holes, the base being provided with a plurality of grooves corresponding to the wiring holes, the grooves being provided with screws for fixing the terminals.

5. The device of claim 4, wherein a wiring groove is further formed on the back of the base housing to connect the mounting portion and the wiring portion, and a conductive connecting member is provided in the wiring groove to connect the plug bush and the connector lug at corresponding positions.

6. The device of claim 5, wherein the wiring grooves and the back surface of the whole base shell are filled with insulating fillers, and the bottom cover plate covers the insulating fillers and is fixedly connected with the base shell through screws.

7. A lossless meter changing device as claimed in claim 2 or 5, wherein the corresponding plug bushes in the meter plug-in post and the terminal plug-in post are connected by conductive connecting parts respectively to form a plurality of sets of current-voltage loops and a set of grounding loop, wherein each plug bush in the voltage loop and the corresponding connector lug of the connector lug are connected by a same conductive connecting part, the connector lug in the current inflow loop is directly connected to two plug bushes in the meter plug-in post by a conductive connecting part, the short-circuit spring plate in the current outflow loop short-circuits two adjacent plug bushes in the terminal plug-in post, and the two short-connected plug bushes are connected to two plug bushes in the meter plug-in post and the corresponding connector lug by a conductive connecting part respectively.

8. A non-destructive meter changing device as recited in claim 2, wherein said front face of said base housing is provided with a first annular enclosure surrounding said two rows of meter posts and a second annular enclosure surrounding said terminal post, at least a portion of said first annular enclosure being configured to conform to the outer shape of said plug housings of said first plug and said second plug, and at least a portion of said second annular enclosure being configured to conform to the outer shape of said third plug.

9. The device of claim 8, wherein said first annular enclosure has at least one protrusion thereon, and said first and second plugs have protrusions on the plug housings that match the shape and position of said protrusion.

10. The device of claim 1, wherein the interlocking mechanism is disposed between the first plug and the second plug and comprises at least one set of resilient snap-fit mechanisms; the elastic clamping mechanism comprises a first clamping piece and a second clamping piece which are movably arranged on the base and respectively provided with an elastic element, and clamping parts are respectively arranged on the plug shells of the first plug and the second plug; when only the first plug/the second plug is plugged, the first clamping piece/the second clamping piece is clamped with the clamping part on the first plug/the second plug under the action of the elastic element, and when the second plug/the first plug is plugged, the plug shell pushes the first clamping piece/the second clamping piece to overcome the elastic force of the elastic element to generate displacement, so that the first clamping piece/the second clamping piece is separated from the clamping part on the first plug/the second plug.

11. The device for lossless table change according to claim 10, wherein the clamping portions are clamping grooves formed in the plug housings of the first plug and the second plug, one ends of the first clamping member and the second clamping member are provided with clamping heads matched with the clamping grooves, and the other ends of the first clamping member and the second clamping member are provided with inclined stress surfaces; when the first plug or the second plug is inserted, the plug shell is in contact with the stress surface and pushes the second clamping piece or the first clamping piece to displace.

12. A lossless meter changing apparatus as claimed in claim 1 or 2, wherein a pair of communication plugs are further provided on the base, and the communication plugs at corresponding positions in the pair of communication plugs are connected to each other.

13. A non-destructive meter changing device according to claim 1, 2 or 12, further comprising an outer case covering said base for covering said first plug, said second plug and/or said third plug; the shell body is fixedly connected with the base through screws at the connecting parts, and lead seal anti-dismounting structures are arranged on the connecting parts.

14. A lossless electricity meter changing device as claimed in claim 13, wherein the top of the plug case of said first plug, second plug and/or third plug is provided with a flat ridge extending throughout the entire case, and the inside of said outer case is provided with a convex beam corresponding to said flat ridge.

15. A lossless table change method using the lossless table change apparatus according to any one of claims 1 to 14, specifically comprising: