A general-purpose current loop short-circuiting tool for a substation

Abstract

The present invention discloses a general current loop short-circuiting tool for a substation, which relates to the technical field of substation auxiliary tools and includes: a housing, on which an upper cover is provided; wiring holes are provided on the side of the housing, and a through-hole groove and a fixing hole are provided on the upper cover; a switching operation mechanism, including a base, on which a first moving contact assembly, a second moving contact assembly and a static contact assembly are provided; the first moving contact assembly and the second moving contact assembly are respectively arranged on both sides of the base and connected to the base, and the static contact assembly passes through the base and is arranged at intervals from the first moving contact assembly and the second moving contact assembly; a conductive sheet, which is arranged at the bottom of the housing and fixed to the fixing column inside the housing by screws; a quick plug-in connector, including a mounting seat, a wiring part and a plug-in part. The present invention sets a switching operation mechanism inside the housing, which can short-circuit and cross-connect the secondary current loop, is convenient to operate, and has the advantages of portability, flexibility, time-saving and reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of substation equipment maintenance, and specifically relates to a general-purpose current loop short-circuiting tool for substations, which is specifically used to short-circuit the secondary current loop of current transformers during the operation of primary equipment and the maintenance of secondary equipment in substations, so as to prevent relay protection accidents or equipment damage caused by the open circuit of the secondary current loop of operating current transformers. Background Art

[0002] Article 13.13 of the "Regulations on Electric Power Safety Work (Substation Part)" stipulates: a) It is prohibited to open the secondary side of a current transformer. When working on an operating current loop, the secondary current loop needs to be short-circuited with a special tool, and it is strictly prohibited to short-circuit the current loop by winding wires to prevent the secondary side of the operating current transformer from opening.

[0003] Common tools for short-circuiting the secondary side of current transformers on-site include: terminal shorting links, four-way plugs, wire crimping, and test leads and other short-circuiting tools. Terminal shorting links and four-way plug tools can reliably short-circuit the secondary side of current transformers. However, their disadvantage is that they cannot short-circuit non-continuous arranged current loops. Wire crimping is flexible in on-site operation and can short-circuit current loops of various layout types, but the on-site production of short-circuiting tools does not meet the requirements of flexibility, reliability, and time-saving. At the same time, on-site operators need to have very high practical skills. The flexibility of test leads is similar to that of wire crimping, but there is a risk that the plug-in is unreliable and easy to fall off.

[0004] Currently, there are 26 750 kV AC substations, 1 ±800 kV converter station, and 1 ±1100 kV converter station in Xinjiang Autonomous Region. According to Article 3.8 of the "Regulations on the Operation and Management of Microcomputer Relay Protection Devices DL / T 587-2007": The service life of microcomputer relay protection devices is generally not less than 12 years. For microcomputer relay protection devices with unstable operation and harsh working environments, the service life can be appropriately shortened according to the operation situation. Equipment operation and maintenance units gradually conduct periodic protection replacement for the put-into-operation equipment according to the service life of microcomputer relay protection devices. Coupled with the defect elimination work of public devices such as measurement and control, PMU, and stability control, it is inevitable to involve the work of short-circuiting operating current loops. Without a reliable and efficient current loop short-circuiting tool, first, it is easy to cause the open circuit of the operating current loop, generating a very high voltage on the secondary side of the current transformer, seriously threatening the safety of personnel and equipment; second, the on-site operators making short-circuiting tools to seal the current take up a lot of manpower and consume a lot of time, seriously hindering the progress of the protection replacement work and resulting in a long operation time for a single set of microcomputer relay protection devices. Third, the temporary short-circuiting tool has no obvious warning sign, which is easy to cause personnel to mistakenly restore the current short-circuiting tool, resulting in the open circuit of the current loop and mis-tripping of the operating equipment, seriously affecting the long-term stable operation of power equipment.

[0005] Therefore, there is an urgent need to develop a general-purpose current loop short-circuiting tool for substations. Summary of the Invention

[0006] To address the deficiencies of the above-mentioned existing technologies, the present invention provides a general-purpose current loop shorting tool for a substation, which solves the limitations of traditional current loop shorting tools used in the current power system and does not meet the requirements of portability, flexibility, time-saving, and reliability for current loop shorting.

[0007] The technical solution proposed by the present invention is as follows:

[0008] A general-purpose current loop shorting tool for a substation, comprising:

[0009] A housing, on which an upper cover is provided, and the housing is snap-fitted with the upper cover;

[0010] A wiring hole is provided on the side of the housing, and a through-hole slot and a fixing hole are provided on the upper cover;

[0011] A switching operation mechanism, including a base, on which a first moving contact assembly, a second moving contact assembly, and a static contact assembly are provided; the first moving contact assembly and the second moving contact assembly are respectively disposed on both sides of the base and connected to the base, the static contact assembly passes through the base and is spaced from the first moving contact assembly and the second moving contact assembly; a sliding block, a shorting fixing groove, and a bridging fixing groove are provided on the base; the sliding block passes through the through-hole slot and extends to the outside of the upper cover;

[0012] A conductive sheet is disposed at the bottom of the housing and fixed to the fixing column inside the housing by screws;

[0013] A quick plug-in connector, including a mounting base, a wiring portion, and a plugging portion, the wiring portion is connected to the conductive sheet, and the plugging portion is used for connecting to a wiring terminal row.

[0014] As a further technical solution of the present invention, an internal threaded column is provided on the fixing hole, the sliding block is aligned with the shorting fixing groove and the bridging fixing groove respectively when it is at both ends of the through-hole slot, and a locking bolt is provided on the fixing hole.

[0015] As a further technical solution of the present invention, the first moving contact assembly includes a current guiding substrate and a moving contact provided on the side of the current guiding substrate; the current guiding substrate and the moving contact are of an integral structure; the structures of the first moving contact assembly and the second moving contact assembly are the same.

[0016] As a further technical solution of the present invention, the static contact assembly includes a static contact current guiding plate, a first side static contact, and a second side static contact, and both ends of the static contact current guiding plate are respectively connected to the first side static contact and the second side static contact; the static contact current guiding plate passes through the side of the switching operation mechanism so that the first side static contact and the second side static contact are respectively disposed on both sides of the switching operation mechanism.

[0017] As a further technical solution of the present invention, the base is made of insulating rubber material.

[0018] As a further technical solution of the present invention, the number of moving contacts of the first moving contact assembly is the same as that of the second moving contact assembly, and the sum of the number of moving contacts of the first moving contact assembly and the second moving contact assembly is the same as the number of static contact assemblies.

[0019] As a further technical solution of the present invention, the number of moving contacts of the first moving contact assembly and the second moving contact assembly is more than 2 respectively.

[0020] Preferably, the first moving contact assembly is provided with 4 moving contacts, the second moving contact assembly is provided with 8 moving contacts, and the static contact assembly is provided with 4 groups of static contacts. Each group of static contacts has two static contacts respectively arranged on both sides of the base and in a conducting state.

[0021] As a further technical solution of the present invention, the plug-in part includes a screw, a spring and a lantern-shaped plug. A spring is arranged outside the screw, and one end of the spring is connected to the lantern-shaped plug. The wire of the wiring part extends into the mounting seat and is connected to the plug-in part.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. In the embodiment of the present invention, the outer shell plays a role of protection and support. A switching operation mechanism is arranged inside the outer shell, which can short-circuit and cross-connect the secondary current circuit. The wire connected to the conductive sheet is connected to the terminal block through a quick plug-in connector, which is convenient for operation and has the characteristics of portability, flexibility, time-saving and reliability.

[0024] 2. The first static contact assembly, the second static contact assembly and the moving contact assembly are used to connect the secondary current circuit; the first static contact assembly and the second static contact assembly are respectively arranged on the left and right of the switching operation mechanism. The moving contact assembly can move in the long axis direction of the switching operation mechanism to realize the switching between different static and moving contacts. When the switching operation mechanism switches to the left, the static contacts arranged on the left and right of the switching operation mechanism are connected to realize the cross-connection of the current circuit. When the switching operation mechanism switches to the right, the four static contacts arranged on both sides of the switching operation mechanism are connected to each other to realize the short-circuit of the current circuit.

[0025] 3. The base is made of insulating rubber material. The base is used to fix the first moving contact assembly, the second moving contact assembly and the static contact assembly, and at the same time ensure the insulation between the first moving contact assembly, the second moving contact assembly and the static contact assembly.

[0026] 4. The switching operation mechanism is provided with a sliding block for convenient function switching.

[0027] 5. The conductor part of the quick connector plug uses a pure copper lantern-shaped banana plug, which can be tightly combined with the current terminal jack, and the connection is firm and reliable.

[0028] 6. The mounting base for the hand-held position of plugging and unplugging uses a rubber insulating material to ensure personal safety; the conductive sheet and the quick connector are connected by a 4mm insulated multi-strand soft copper wire to ensure a good path for the current loop. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The structure diagram of a general current loop short-circuiting tool proposed by the present invention;

[0030] Figure 2 The schematic structural diagram of the switching operation mechanism proposed by the present invention;

[0031] Figure 3 The schematic diagram of the conductive sheet proposed by the present invention;

[0032] Figure 4 The structure diagram of the static contact assembly proposed by the present invention;

[0033] Figure 5 The structure diagram of the first moving contact assembly proposed by the present invention;

[0034] As shown in the figure:

[0035] 10 - housing, 20 - switching operation mechanism, 30 - conductive sheet, 40 - quick connector;

[0036] 101 - upper cover, 102 - wiring hole, 103 through-hole groove, 104 - fixing hole, 105 - locking bolt;

[0037] 201 - base, 202 - first moving contact assembly, 203 - second moving contact assembly, 204 - static contact assembly;

[0038] 211 - sliding block, 212 - short-circuit fixing groove, 213 - bridging fixing groove;

[0039] 221 - current-carrying substrate, 222 - moving contact;

[0040] 241 - static contact current-carrying plate, 242 - first-side static contact, 243 - second-side static contact,

[0041] 401 - mounting base, 402 - wiring part, 403 - plugging part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The concept, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present invention.

[0043] As Figures 1 to 5 shown, it shows a specific implementation manner of the present invention.

[0044] A general-purpose current loop short-circuiting tool for a substation, comprising: a housing 10, on which an upper cover 101 is provided, and the housing 10 is buckled with the upper cover 101 and connected by screws; a wiring hole 102 is provided on the side of the housing 10, and a through-hole groove 103 and a fixing hole 104 are provided on the upper cover 101; a switching operation mechanism 20, comprising a base 201, on which a first moving contact assembly 202, a second moving contact assembly 203 and a static contact assembly 204 are provided; the first moving contact assembly 202 and the second moving contact assembly 203 are respectively arranged on both sides of the base 201 and connected to the base 201, and the static contact assembly 204 passes through the base 201 and is arranged at intervals with the first moving contact assembly 202 and the second moving contact assembly 203; a sliding block 211, a short-circuit fixing groove 212 and a cross-connection fixing groove 213 are provided on the base 201; the sliding 211 passes through the through-hole groove 103 and extends to the outside of the upper cover 101; a conductive sheet 30, which is arranged at the bottom of the housing 10 and fixed to the fixing column inside the housing 10 by screws; the conductive sheet is made of a copper sheet, and mounting holes are provided on the copper sheet and fixed to the fixing column inside the housing by screws; a quick plug-in member 40, comprising a mounting seat 401, a wiring portion 402 and a plugging portion 403, the wiring portion 402 is connected to the conductive sheet 30, and the plugging portion 403 is used for connecting to a wiring terminal row.

[0045] In the embodiment of the present invention, the housing plays a role of protection and support. A switching operation mechanism is arranged inside the housing, which can short-circuit and cross-connect the secondary current loop. When the static contacts and moving contacts of the first moving contact assembly, the second moving contact assembly and the static contact assembly are in the same plane and move left and right on the base, they respectively contact the conductive sheet. The base is fixed to the housing through the locking bolts on the base and the base is pressed downward to the bottom of the housing to ensure good contact between the moving contact, the static contact and the conductive sheet. Second fixing holes can also be provided on the housing, and second short-circuit fixing grooves and second cross-connection fixing grooves can be provided on the base, so that the base is evenly stressed and fixed through the locking bolts, enhancing the contact between the moving contact, the static contact on the base and the conductive sheet and preventing virtual connection. The wire connected to the conductive sheet is connected to the wiring terminal row through the quick plug-in member, which is convenient for operation.

[0046] In an embodiment of the present invention, an internal threaded post is provided on the fixing hole 104. When the sliding block 211 is at both ends of the through-hole groove 103, it is aligned with the short-circuit fixing groove 212 and the cross-connection fixing groove 213 respectively, and a locking bolt 105 is provided on the fixing hole 104.

[0047] In an embodiment of the present invention, the first moving contact assembly 202 includes a current guiding substrate 221 and a moving contact 222 provided on the side of the current guiding substrate 221; the current guiding substrate 221 and the moving contact 222 are of an integral structure; the structures of the first moving contact assembly 202 and the second moving contact assembly 203 are the same.

[0048] In an embodiment of the present invention, the static contact assembly 204 includes a static contact current guiding plate 241, a first side static contact 242 and a second side static contact 243. The two ends of the static contact current guiding plate 241 are respectively connected to the first side static contact 242 and the second side static contact 243; the static contact current guiding plate 241 passes through the side of the switching operation mechanism 20 so that the first side static contact 242 and the second side static contact 243 are respectively located on both sides of the switching operation mechanism 30.

[0049] In an embodiment of the present invention, the first static contact assembly, the second static contact assembly and the moving contact assembly are used to connect the secondary current circuit; the first static contact assembly and the second static contact assembly are respectively arranged on the left and right of the switching operating mechanism, and the moving contact assembly can move in the long axis direction of the switching operating mechanism to realize the switching between different static and moving contacts. When the switching operating mechanism switches to the left, the static contacts arranged on the left and right of the switching operating mechanism are connected to realize the cross-connection of the current circuit. When the switching operating mechanism switches to the right, the four static contacts arranged on both sides of the switching operating mechanism are connected to each other to realize the short-circuit of the current circuit.

[0050] In an embodiment of the present invention, the base 201 is made of insulating rubber material. The base is used to fix the first moving contact assembly and the second moving contact assembly, and at the same time ensure the insulation between the first moving contact assembly, the second moving contact assembly and the static contact assembly.

[0051] In an embodiment of the present invention, the number of moving contacts of the first moving contact assembly 202 and the number of moving contacts of the second moving contact assembly 203 are both more than 2. Since the short-circuit and cross-connection functions need to be realized, at least two groups of moving contacts and two groups of static contacts are provided.

[0052] The number of moving contacts and static contacts can be set as needed. The number of moving contacts of the first moving contact assembly 202 is the same as the number of moving contacts of the second moving contact assembly 203, and the sum of the number of moving contacts of the first moving contact assembly 202 and the second moving contact assembly 203 is the same as the number of the static contact assembly 204.

[0053] In the embodiment of the present invention, the switching operating mechanism is provided with a sliding block for convenient function switching. A handle is arranged on the sliding block for convenient movement; on the base of the switching operating mechanism, a locking screw hole of the operating mechanism is arranged on one side of the sliding block. After the switching in the upward or downward direction is in place, the screw hole on the base of the switching operating mechanism corresponds to the base, and a bolt is used to limit its position to prevent the operating mechanism from sliding during use.

[0054] Further, the plugging part 403 includes a screw, a spring and a lantern-shaped plug. A spring is arranged on the outer side of the screw, and one end of the spring is connected to the lantern-shaped plug. The wire of the wiring part extends into the mounting seat and is connected to the plugging part.

[0055] In the embodiment of the present invention, the conductor part of the quick plug-in connector adopts a pure copper lantern-shaped banana plug, which can be tightly combined with the current terminal jack. At the same time, the combined screw fixing structure will not have any looseness, and the connection is firm and reliable; the cylindrical part connected to the conductor part of the plug.

[0056] The mounting seat as the holding position for plugging and unplugging adopts a rubber insulating material to ensure personal safety; the cable connected to the cylinder is a 4mm2 cable, and the conductive sheet and the quick plug-in connector are connected by a 4mm insulated multi-strand soft copper wire to ensure a good current path in the current loop.

[0057] Further, the first moving contact assembly 202 is provided with 4 moving contacts, the second moving contact assembly 203 is provided with 8 moving contacts, and the static contact assembly 204 is provided with 4 groups of static contacts. Each group of static contacts is two static contacts respectively arranged on both sides of the base and in a conducting state.

[0058] The present invention preferably uses eight quick plug-in connectors as a group to be connected to the current switching component through a cable, and can simultaneously realize the short-circuiting of two groups (A / B / C / N) of currents and the cross-connection of one group of currents.

[0059] A current loop short-circuiting tool general for a substation provided by the present invention can completely replace the short-circuiting tools such as short-circuiting pieces and wires commonly used in the current system. At the same time, it solves the problems of difficult operation, inflexibility, high risk, etc. It is applicable to current terminal loops with various arrangements, is convenient to use and reliable, and has strong versatility. It is convenient for secondary maintenance personnel to seal the operating current loop, achieving the purposes of safety and convenience.

[0060] The above has introduced the present invention in detail, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can also be made without departing from the gist of the present invention. Many other changes and modifications can be made without departing from the concept and scope of the present invention. It should be understood that the present invention is not limited to a specific embodiment, and the scope of the present invention is defined by the appended claims.

Claims

1. A general current loop short - circuit tool for a substation, characterized in that, Comprising: A housing, on which a top cover is provided, and the housing is snap-fitted with the top cover; A wiring hole is provided on the side of the housing, and a through-hole groove and a fixing hole are provided on the top cover; A switching operating mechanism, including a base, on which a first moving contact assembly and a second moving contact assembly are provided; the first moving contact assembly and the second moving contact assembly are respectively arranged on both sides of the base and connected to the base, and a static contact assembly is arranged at an interval from the first moving contact assembly and the second moving contact assembly; a sliding block, a short-circuit fixing groove and a jumper fixing groove are provided on the base; the sliding block passes through the through-hole groove and extends to the outside of the top cover; the first static contact assembly, the second static contact assembly and the moving contact assembly are used for connecting the secondary current circuit; the first static contact assembly and the second static contact assembly are respectively arranged on the left and right of the switching operating mechanism, and the moving contact assembly can move in the long-axis direction of the switching operating mechanism to realize the switching between different static and moving contacts; A conductive sheet is arranged at the bottom of the housing and fixed to the fixing post inside the housing by screws; A quick plug-in connector, including a mounting seat, a wiring part and a plugging part, the wiring part is connected to the conductive sheet, and the plugging part is used for connecting to a wiring terminal row.

2. The universal current loop short-circuiting tool for a substation according to claim 1, wherein An internal threaded post is provided on the fixing hole, the sliding block is aligned with the short-circuit fixing groove and the jumper fixing groove respectively when it is at both ends of the through-hole groove, and a locking bolt is provided on the fixing hole.

3. A general current loop short - circuit tool for a substation according to claim 1, characterized in that, The first moving contact assembly includes a current guiding substrate and a moving contact arranged on the side of the current guiding substrate; the current guiding substrate and the moving contact are of an integral structure; the first moving contact assembly and the second moving contact assembly have the same structure.

4. A general current loop short - circuit tool for a substation according to claim 1, characterized in that The static contact assembly includes a static contact current guiding plate, a first side static contact and a second side static contact, and both ends of the static contact current guiding plate are respectively connected to the first side static contact and the second side static contact; the static contact current guiding plate passes through the side of the switching operating mechanism so that the first side static contact and the second side static contact are respectively arranged on both sides of the switching operating mechanism.

5. A general current loop short - circuiting tool for a substation according to claim 1, characterized in that The base is made of insulating rubber material.

6. A general current loop short - circuit tool for a substation according to claim 1, characterized in that, The number of moving contacts of the first moving contact assembly is the same as that of the second moving contact assembly, and the sum of the number of moving contacts of the first moving contact assembly and the second moving contact assembly is the same as the number of the static contact assembly.

7. A general current loop short - circuit tool for a substation according to claim 1, characterized in that, The number of moving contacts of the first moving contact assembly and the second moving contact assembly is more than 2 respectively.

8. The universal current loop short - circuit tool for a substation according to claim 7, characterized in that, The first moving contact assembly is provided with 4 moving contacts, the second moving contact assembly is provided with 8 moving contacts, and the static contact assembly is provided with 4 groups of static contacts, and each group of static contacts has two static contacts respectively arranged on both sides of the base and in a conducting state.

9. The universal current loop short - circuit tool for a substation according to claim 1, wherein The plugging part includes a screw, a spring and a lantern-shaped plug, the spring is arranged on the outside of the screw, one end of the spring is connected to the lantern-shaped plug, and the wire of the wiring part extends into the mounting seat and is connected to the plugging part.

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