Test sleeve connecting pipe with fracture for composite apparatus
By designing a test bushing connection pipe with a break for combined electrical appliances, the problem of high-voltage insulation testing affecting power station operation when connecting combined electrical appliances to transformers was solved, realizing safe and reliable testing without busbar power outage and meeting the needs of uninterrupted maintenance.
Patent Information
- Application Number
- CN202422819941.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-11-19
AI Technical Summary
In the current technology, when the combined electrical appliances are connected to the transformer, the high-voltage insulation test requires the use of the existing overhead line bushing, which leads to an expansion of the busbar power outage area, affects the normal operation of the power station, and may cause damage and safety hazards to the existing equipment.
Design a test bushing connection tube with a break for combined electrical appliances. The physical disconnection between the transformer and the combined electrical appliances is achieved through the inner conductor and conductor joint, allowing for independent high-voltage insulation testing, avoiding the need for previous equipment, and ensuring the safe and reliable operation of power station equipment.
It enables high-voltage insulation testing without busbar power outage, ensuring the safe and reliable operation of power station equipment, meeting the requirements for uninterrupted maintenance, avoiding equipment damage and safety hazards, and ensuring normal power supply to the power station.
Smart Images
Figure CN223501048U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrical testing, and more particularly to the field of combined electrical appliance testing technology, specifically referring to a test sleeve connection tube with a break for combined electrical appliances. Background Technology
[0002] When directly connecting the integrated electrical equipment (GIS) and the transformer, during the on-site handover test, because the test voltages of the GIS and the transformer are different, it is necessary to conduct high-voltage insulation tests on the GIS and the transformer separately. At this time, a break (usually a detachable conductor) needs to be set at the connection point between the GIS and the transformer to achieve physical disconnection between the two.
[0003] When the project is a new construction, the test voltage can be applied through the bushing of the overhead line bay; when the project is an expansion of the transformer bay, it is usually necessary to shut down the previous equipment and apply the test voltage to the bushing of the overhead line bay of the previous equipment.
[0004] After the GIS equipment with double busbar connection is put into normal operation, maintenance is carried out on the non-terminal bays (such as bus tie and section bays without overhead bushings). According to relevant national and industry standards, the equipment under maintenance needs to undergo high-voltage insulation testing. Usually, it is necessary to apply the test voltage using the bushings of other overhead line bays, which expands the power outage area and adversely affects the normal operation of the power station.
[0005] Currently, existing technologies have the following limitations:
[0006] 1. The GIS and transformer of the expansion project are directly connected. High-voltage insulation tests on site require the use of the bushings of the existing overhead line. The voltage is transmitted to the equipment of this expansion through the busbar, which requires the busbar to be de-energized, thus expanding the scope of power outages and hindering the normal operation of the power station.
[0007] 2. When a GIS bay without a terminal is inspected after commissioning, a high-voltage insulation test is required on-site. This requires the use of the bushings of the previously installed overhead line bays. The voltage is transmitted to the equipment under maintenance via the busbar, which necessitates a busbar outage, expanding the outage area and hindering the normal operation of the power station.
[0008] 3. On-site high-voltage insulation testing is a damaging test to the internal insulation components of GIS. Bringing in too much pre-existing equipment during the test will have a very adverse effect on the safety and reliability of the pre-existing equipment, and may even cause insulation breakdown during the test or after power supply and commissioning, resulting in significant economic losses.
[0009] 4. If the high-voltage insulation test is conducted on the equipment from the previous period, and the test voltage is 80% of the standard power frequency voltage, the assessment voltage value of the equipment in this period will be reduced, which may pose a hidden danger to the safe and reliable operation of the equipment after it is put into operation.
[0010] 5. When exporting GIS equipment to other countries and regions, the product structure must meet the local operation and maintenance requirements. It cannot be used in countries that explicitly require GIS equipment to be able to perform maintenance without power interruption. Utility Model Content
[0011] This utility model addresses the shortcomings of existing technologies by providing a test bushing connection pipe with a break for combined electrical appliances. It eliminates the need for existing overhead line bay bushings, avoids simultaneous busbar power outages, and does not involve existing equipment. This facilitates the safe and reliable operation of power station equipment, does not affect normal power consumption, and meets customer needs.
[0012] This utility model is achieved through the following technical solution: a test sleeve connection tube with a break for a combined electrical appliance, comprising a tube body with both ends connected to a wiring sleeve and a combined sleeve of the combined electrical appliance respectively, a conductor block located inside the tube body and connected to the combined conductor of the combined electrical appliance, and an inner conductor detachably connected to the conductor block. The other end of the inner conductor is detachably connected to the wiring conductor inside the wiring sleeve, and the conductor block is also connected to the test conductor of the test sleeve.
[0013] In use, when the combined electrical appliance is connected to the transformer, the bushing is the transformer bushing connected to the transformer, and the conductor is the transformer conductor inside the bushing. The transformer conductor and the combined conductor are connected through the inner conductor and the conductor joint, thus ensuring the normal operation of the electrical appliance. When testing the transformer, the conductor joint is connected to the transformer conductor; when testing the combined electrical appliance, the conductor joint is connected to the combined conductor. Then, the inner conductor is disassembled, thus physically disconnecting the transformer conductor and the combined conductor. Finally, the test conductor is connected to the conductor joint, thereby enabling independent testing of the transformer and the combined electrical appliance.
[0014] Similarly, when using double busbar combined electrical appliances, the connecting bushing is the second combined bushing connected to the second combined electrical appliance, and the connecting conductor is the second combined conductor inside the second combined bushing. When this device is installed on the bus tie bay, it is connected through the inner conductor during normal operation. When the bus tie bay is under maintenance, the conductor block is connected to the test conductor for high-voltage insulation testing. The inner conductor is removed, and the break formed inside the tube, the circuit breaker or disconnector of the bus tie bay, and the maintenance side and the other busbar are also broken. The setting of the double break does not affect the energized operation of other equipment in the power station.
[0015] By installing the connecting pipe, there is no need to rely on the existing overhead line bushing, the busbar does not need to be de-energized at the same time, and the existing equipment is not brought in. This is conducive to the safe and reliable operation of the power station equipment, does not affect the normal power supply of users, and meets customer needs.
[0016] Preferably, the tube body has a housing interface that can be detachably connected to the test sleeve, and the test conductor passes through the housing interface and is connected to the first conductor.
[0017] This preferred design facilitates the connection between the test sleeve and the tube body through the design of the shell interface.
[0018] Preferably, one end of the pipe body is also connected to a telescopic pipe, which is connected to a transformer bushing or a combined bushing.
[0019] This preferred solution, through the setting of the telescopic tube, facilitates the adjustment of the connection length error of the tube body, and also facilitates the installation and disassembly of the tube body.
[0020] Preferably, the tube body includes a first through pipe and a second through pipe connected in sequence, and the first through pipe has the shell interface.
[0021] This preferred embodiment has been statistically analyzed for the configuration of the first and second through pipes, which facilitates the replacement of the first through pipe with housing interfaces of different sizes.
[0022] Preferably, the tube body has two hand holes arranged opposite each other, forming a channel in which the connection between the first conductor and the second conductor is located. This preferred embodiment facilitates the connection and disconnection of the first and second conductors through the hand holes; the two hand holes further facilitate this connection and disconnection; and the specific position of the hand holes further facilitates the connection and disconnection of the first and second conductors.
[0023] Preferably, the inner conductor includes a first conductor and a second conductor bolted together, the first conductor being connected to the conductor junction box and the second conductor being connected to the wiring conductor.
[0024] This preferred embodiment facilitates the disassembly of the inner conductor within the tube by using the first and second conductors.
[0025] Preferably, the two ends of the tube are provided with insulators that connect to the conductor joint and the inner conductor. This preferred arrangement facilitates the connection of the conductor joint and the inner conductor with the connecting conductor and the combined conductor.
[0026] The beneficial effects of this utility model are as follows: When the combined electrical appliance is connected to the transformer, the bushing is the transformer bushing connected to the transformer, and the conductor is the transformer conductor inside the bushing. The transformer conductor and the combined conductor are connected through the inner conductor and the conductor joint, thereby ensuring the normal operation of the electrical appliance. When testing the transformer, the conductor joint is connected to the transformer conductor; when testing the combined electrical appliance, the conductor joint is connected to the combined conductor. Then, the inner conductor is disassembled, thereby physically disconnecting the transformer conductor and the combined conductor. Then, the test conductor is connected to the conductor joint, thus enabling independent testing of the transformer and the combined electrical appliance.
[0027] Similarly, when using double busbar combined electrical appliances, the connecting bushing is the second combined bushing connected to the second combined electrical appliance, and the connecting conductor is the second combined conductor inside the second combined bushing. When this device is installed on the bus tie bay, it is connected through the inner conductor during normal operation. When the bus tie bay is under maintenance, the conductor block is connected to the test conductor for high-voltage insulation testing. The inner conductor is removed, and the break formed inside the tube, the circuit breaker or disconnector of the bus tie bay, and the maintenance side and the other busbar are also broken. The setting of the double break does not affect the energized operation of other equipment in the power station.
[0028] By installing the connecting pipe, there is no need to rely on the existing overhead line bushing, the busbar does not need to be de-energized at the same time, and the existing equipment is not brought in. This is conducive to the safe and reliable operation of the power station equipment, does not affect the normal power supply of users, and meets customer needs. Attached Figure Description
[0029] Figure 1 This is a schematic diagram of the structure of this utility model;
[0030] Figure 2 This is a schematic diagram of the structure of Example 1;
[0031] Figure 3 This is a schematic diagram of the combined electrical appliance during the test in Example 1;
[0032] Figure 4 This is a schematic diagram of the transformer structure during the test in Example 1;
[0033] Figure 5 This is a schematic diagram of the structure of Example 2;
[0034] Figure 6 This is a schematic diagram of the structure of the II busbar combination electrical appliance during the test in Example 2;
[0035] Figure 7 This is a schematic diagram of the structure of the I-type combined electrical appliance during the test in Example 2;
[0036] As shown in the figure:
[0037] 1. First conductor, 2. Second conductor, 3. Tube body, 4. Conductor junction block, 5. Shell interface, 6. First insulator, 7. Expansion tube, 8. Hand hole, 9. Test bushing, 10. Transformer bushing, 11. Combined bushing, 12. II busbar combined electrical appliance, 13. I busbar combined electrical appliance, 14. First disconnecting switch, 15. Second disconnecting switch, 16. Circuit breaker, 31. First conduit, 32. Second conduit. Detailed Implementation
[0038] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.
[0039] This utility model discloses a test sleeve connection tube with a break for a combined electrical appliance. The connection tube is located between the combined sleeve 11 and the wiring sleeve. The combined sleeve 11 is connected to the combined electrical appliance, and the wiring sleeve is connected to the combined electrical appliance or transformer. The wiring sleeve is provided with a wiring conductor, and the combined sleeve 11 is provided with a combined conductor.
[0040] The connecting pipe includes a first through pipe 31, a second through pipe 32, and a telescopic pipe 7 connected in sequence. The first through pipe 31 is connected to the combined sleeve 11, and the telescopic pipe 7 is connected to the wiring sleeve. The first through pipe 31 and the second through pipe 32 form the pipe body 3.
[0041] The first conduit 31 is provided with a first conductor 1 extending into the second conduit 32. The telescopic tube 7 is provided with a second conductor 2 extending into the second conduit 32 and bolted to the first conductor 1. The connecting plate of the first conductor 1 is provided with a threaded through hole. The second conductor 2 is provided with a threaded countersunk hole corresponding to the threaded through hole. The bolt threaded in the threaded through hole is threaded in the threaded countersunk hole, thereby enabling the connection of the first conductor 1 and the second conductor 2. The first conductor 1 and the second conductor 2 form an inner conductor located in the tube body 3.
[0042] The first conduit 31 is also provided with a conductor block 4, which has two stud contacts. One stud contact is connected to the first conductor 1. The first insulator 6 is provided at the port of the first conduit 31 away from the second conduit 32. The first insulator 6 is connected to the conductor block 4. The second insulator is provided at the port of the telescopic tube 7 away from the second conduit 32. The second insulator is connected to the second conductor 2 through a contact seat.
[0043] The conductor junction 4 is connected to the combined conductor through the first insulator 6, and the second conductor 2 is connected to the wiring conductor through the second insulator.
[0044] The first conduit 31 is provided with a housing interface 5 located directly above the conductor junction block 4 and detachably connected to the test sleeve. The test conductor of the test sleeve 9 passes through the housing interface 5 and is connected to another quincunx contact of the conductor junction block 4.
[0045] The second conduit 32 has two hand holes 8, which are arranged opposite each other to form a channel. The connection between the first conductor 1 and the second conductor 2 is located in the channel.
[0046] Example 1:
[0047] See attached document Figure 1-4 In this embodiment, the connecting pipe is used for direct connection between the combined electrical appliances and the transformer.
[0048] Therefore, the bushing is the transformer bushing 10 connected to the transformer, and the conductor is the transformer conductor inside the transformer bushing 10.
[0049] In this embodiment, the transformer conductor and the combined conductor are connected by the first conductor 1, the second conductor 2, and the conductor connector 4 to ensure the normal operation of the electrical appliance. When testing the transformer, the conductor connector 4 is connected to the transformer conductor. When testing the combined electrical appliance, the conductor connector 4 is connected to the combined conductor. Then the inner conductor is disassembled to physically disconnect the transformer conductor and the combined conductor. Then the test conductor is connected to the conductor connector 4, thereby enabling independent testing of the transformer and the combined electrical appliance.
[0050] Example 2:
[0051] See attached document Figure 1 , 5 -7. The difference between this embodiment and the previous embodiment is that the connecting pipe is used for maintenance of the double busbar combined electrical appliance without a terminal interval after commissioning.
[0052] The other end of the telescopic tube 7 is connected to the I bus combination appliance 13 through the first disconnecting switch 14, and the other end of the first through tube 31 is connected to the II bus combination appliance 12 through the circuit breaker 16 and the second disconnecting switch 15. The contact seat is connected to the I bus conductor in the first disconnecting switch 14, and the conductor block 4 is connected to the II bus conductor.
[0053] That is, the combined conductor is the II bus conductor, the wiring conductor is the I bus conductor, the wiring bushing is the first disconnecting switch 14, and the combined bushing 11 is the bushing connected to the II bus combined electrical appliance.
[0054] When using double busbar combined electrical appliances, this device is installed on the bus tie interval. During normal operation, it is connected through the inner conductor. During the maintenance of the bus tie interval, the conductor block 4 is connected to the test conductor to conduct a high-voltage insulation test.
[0055] During the test state on the I bus side, conductor block 4, first conductor 1, and second conductor 2 are normally connected. The II bus side forms a double break with the first disconnecting switch 14 through circuit breaker 16. The II bus combined electrical appliance is normally energized and operated. After maintenance on the I bus side, an insulation withstand voltage test is performed.
[0056] During the test on the II bus side, the first conductor 1 and the second conductor 2 are removed, forming a break in the tube 3. The isolating switch on the I bus side also forms a break, thus forming a double break. The I bus combined electrical appliance operates normally with power. After the II bus side is inspected, an insulation withstand voltage test is performed.
[0057] When the combined electrical appliances and transformers of the expansion project are directly connected, the high-voltage insulation test of the expansion equipment can be carried out directly through the shell interface 5 without the need for the existing overhead line bushings, and without the need for the busbar to be de-energized at the same time. The existing equipment can be operated normally with power on, which is conducive to the safe and reliable operation of the power station equipment and does not affect the normal power supply of users.
[0058] If maintenance is required after the double busbar combined electrical equipment has no terminal bay, high-voltage insulation testing can be carried out directly through the test bushing connected by this scheme after maintenance. This eliminates the need for the existing overhead line bay bushing and the need for simultaneous busbar de-energization. The equipment can operate normally with the power supply on the ground, which is conducive to the safe and reliable operation of the power station equipment and does not affect the normal power supply of users.
[0059] The on-site high-voltage insulation test can be conducted independently without involving the previous equipment, which has no adverse impact on the safety and reliability of the previous equipment. Furthermore, the current equipment can be tested and evaluated according to the standard power frequency voltage, effectively ensuring the safety and reliability of the current equipment.
[0060] This solution effectively meets the operation and maintenance requirements of combined electrical equipment exported to other countries: it ensures that the combined electrical equipment can be maintained without power interruption, and that maintenance of any compartment does not affect the normal operation of other compartments.
[0061] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.
Claims
1. A test sleeve connector with a break for combined electrical appliances, characterized in that: It includes a tube body (3) that is connected at both ends to a wiring sleeve and a combination sleeve (11) of a combination appliance, a conductor block (4) located inside the tube body (3) and connected to the combination conductor of the combination appliance, and an inner conductor that is detachably connected to the conductor block (4). The other end of the inner conductor is detachably connected to the wiring conductor inside the wiring sleeve. The conductor block (4) is also connected to the test conductor of the test sleeve (9).
2. The test sleeve connector with a break for combined electrical appliances according to claim 1, characterized in that: The tube body (3) is provided with a shell interface (5) that can be detachably connected to the test sleeve, and the test conductor passes through the shell interface (5) and is connected to the inner conductor.
3. The test sleeve connection pipe with a break for combined electrical appliances according to claim 1, characterized in that: One end of the tube body (3) is also connected to a telescopic tube (7), and the telescopic tube (7) is connected to a transformer sleeve (10) or a combined sleeve (11).
4. The test sleeve connector with a break for combined electrical appliances according to claim 2, characterized in that: The tube body (3) includes a first through pipe (31) and a second through pipe (32) connected in sequence, and the first through pipe (31) is provided with the shell interface (5).
5. The test sleeve connection pipe with a break for combined electrical appliances according to claim 1, characterized in that: The inner conductor includes a first conductor (1) and a second conductor (2) connected by bolts. The first conductor (1) is connected to the conductor block (4), and the second conductor (2) is connected to the wiring conductor.
6. The test sleeve connector with a break as described in claim 5 for combined electrical appliances, characterized in that: The tube body (3) is provided with a hand hole (8). There are two hand holes (8), which are arranged opposite to each other. The two hand holes (8) form a channel, and the connection between the first conductor (1) and the second conductor (2) is located in the channel.
7. The test sleeve connector with a break for combined electrical appliances according to claim 6, characterized in that: The two ports of the tube body (3) are provided with insulators that connect to the conductor junction block (4) and the inner conductor.