Mobile substation

Abstract

A mobile substation, which includes a transformer, a transformer bushing, a cable terminal, an isolating switch, a driving device, and a low-voltage control device; the input end of the transformer is electrically connected to one end of the isolating switch through the transformer bushing, and the other end of the isolating switch is matched with one end of the cable terminal; the driving device is drivingly connected to the isolating switch to drive the isolating switch to be closed / open with the cable terminal; the transformer bushing includes a conductor, a first insulating core, a voltage transformer and a current transformer arranged on the first insulating core, a circuit breaker, and a first insulating pull rod; the first insulating core includes a main insulating capacitor embedded therein, and the main insulating capacitor includes a first capacitor and a second capacitor located at both ends of the first insulating core; the first insulating core further includes a third capacitor embedded therein, and the third capacitor is located outside the main insulating capacitor and is connected in series with it, integrating a variety of electrical components into the transformer bushing, simplifying the installation of the substation.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and particularly relates to a mobile substation. Background Art

[0002] A substation refers to a device or a place in a power system that transforms voltage and current, receives and distributes electric energy. Among them, as an important type, a mobile substation usually includes a transformer, an operating mechanism, a low-voltage controller, an isolating switch, a cable terminal, a potential transformer PT, a current transformer CT, and a lightning arrester. Existing mobile substations mostly have problems such as more components, high assembly load, low degree of integration, and the monitoring signals are easily interfered by the outside world. Summary of the Invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a mobile substation with a simple structure and convenient assembly.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A mobile substation, which includes a transformer T, a transformer bushing 1, a cable terminal 2, an isolating switch 3, a driving device 4 and a low-voltage control device CRL; the input end of the transformer T is electrically connected to one end of the isolating switch 3 through the transformer bushing 1, the other end of the isolating switch 3 is matched with one end of the cable terminal 2, and the other end of the cable terminal 2 is connected to an external circuit through a cable 6; the driving device 4 is drivingly connected to the isolating switch 3 to drive the isolating switch 3 to be closed / open with the cable terminal 2; the transformer bushing 1 includes a conductor 10a, a first insulating core 11a, a potential transformer PT and a current transformer CT arranged on the first insulating core 11a, a circuit breaker 12a and a first insulating pull rod 120a; the circuit breaker 12a includes a moving contact and a static contact used in cooperation, the static contact is electrically connected to the input end of the transformer T through the conductor 10a, the driving device 4 is drivingly connected to the moving contact through the first insulating pull rod 120a to drive the moving contact to be closed / open with the static contact, and the moving contact is also electrically connected to the cable terminal 2 through the isolating switch 3; the first insulating core 11a wraps the conductor 10a and the circuit breaker 12a, and the first insulating core 11a includes a main insulating capacitor embedded therein, the main insulating capacitor includes a first capacitor C1 and a second capacitor C2 located at both ends of the first insulating core 11a, and both the first capacitor C1 and the second capacitor C2 are composed of a plurality of coaxial capacitor screens with gradually increasing diameters and arranged alternately with insulating layers; the first insulating core 11a further includes a third capacitor embedded therein, the third capacitor is located outside the main insulating capacitor and is connected in series with it, the third capacitor is composed of a plurality of capacitor screens with gradually increasing diameters and arranged alternately with insulating layers, or the third capacitor is a capacitor tap of the main insulating capacitor; one end of the third capacitor connected to the main insulating capacitor is the current signal output end, and the other end is grounded, and the third capacitor and the main insulating capacitor form the current transformer CT.

[0006] Preferably, the transformer bushing 1 further includes a lightning arrester disc group 14a, the lightning arrester disc group 14a is sleeved outside the first insulating pull rod 120a, and the lightning arrester disc group 14a and the first insulating core 11a are respectively located at both ends of the transformer bushing 1, one end of the lightning arrester disc group 14a adjacent to the first insulating core 11a is electrically connected to the moving contact, and the other end is grounded.

[0007] Preferably, the driving device 4 includes a permanent magnet mechanism 16a, the permanent magnet mechanism 16a is drivingly connected to the moving contact through the first insulating pull rod 120a to drive the moving contact to be closed / open with the static contact; the driving device 4 further includes a second insulating pull rod 41 and an operating mechanism 44, the operating mechanism 44 is drivingly connected to the isolating switch 3 through the second insulating pull rod 41 to drive the isolating switch 3 to swing, so that the isolating switch 3 is closed / open with the cable terminal 2; the permanent magnet mechanism 16a and the operating mechanism 44 are respectively electrically connected to the low-voltage control device CRL.

[0008] Preferably, the transformer bushing 1 further includes a terminal 121a, which is arranged between the arrester disc group 14a and the first insulating core 11a. The terminal 121a is electrically connected to the moving contact through a flexible current-carrying connection 122a, and the terminal 121a is also electrically connected to the arrester disc group 14a and the isolating switch 3 respectively.

[0009] Preferably, the driving device 4 includes a tripping lever 40, a second insulating pull rod 41, a stopper 42 and a linkage shaft 43. The middle of the tripping lever 40 is rotatably arranged. One end is connected to the first insulating pull rod 120a, and the other end is hinged to one end of the second insulating pull rod 41. The other end of the second insulating pull rod 41 is drivingly connected to the linkage shaft 43. The middle of the second insulating pull rod 41 is also drivingly connected to the isolating switch 3. The linkage shaft 43 is arranged on the transformer T. The low-voltage control device CRL controls the action of the linkage shaft 43. The linkage shaft 43 drives the tripping lever 40 and the isolating switch 3 to swing through the second insulating pull rod 41, so that the isolating switch 3 is closed / open with the cable terminal 2. At the same time, the tripping lever 40 drives the circuit breaker 12a to close / open through the first insulating pull rod 120a.

[0010] Preferably, when the isolating switch 3 is closed with the cable terminal 2 and the circuit breaker 12a is closed, the tripping lever 40 is parallel to the isolating switch 3.

[0011] Preferably, it further includes an arrester disc group 14a sleeved outside the insulating pull rod 41. One end of the arrester disc group 14a is electrically connected to the isolating switch 3, and the other end is grounded.

[0012] Preferably, the potential transformer PT is a coreless coil or a core coil, and is sleeved outside the middle of the first insulating core 11a and located outside the second capacitor C2.

[0013] Preferably, it further includes a substation installation box H, which includes an installation box bottom plate H0. A plurality of lifting rings H01 are arranged on the installation box bottom plate H0. The transformer T, the transformer bushing 1, the cable terminal 2, the isolating switch 3, the driving device 4 and the low-voltage control device CRL are all arranged in the substation installation box H.

[0014] Preferably, the transformer T and the low-voltage control device CRL are both arranged on the installation box bottom plate H0. The substation conversion installation box H further includes an installation box side wall H1, an installation box top wall H2 and a partition wall H3. The lower end of the partition wall H3 is arranged on the transformer T between the input end and the output end of the transformer T. The upper end of the partition wall H3 cooperates with the installation box top wall H2. The input end of the transformer T, the transformer bushing 1, the cable terminal 2, the isolating switch 3, the driving device 4 and the arrester disc group 14a are all located on one side of the partition wall H3, and the output end of the transformer T and the low-voltage control device CRL are located on the other side of the partition wall H3.

[0015] For the mobile substation of the present invention, its transformer bushing includes a potential transformer PT, a current transformer CT, and a circuit breaker. Integrating multiple electrical components into the transformer bushing greatly simplifies the number of components and the installation operation of the mobile substation of the present invention. Moreover, the transformer bushing includes a first insulating core body, and a main insulating capacitor and a third capacitor are embedded in the first insulating core body. The main insulating capacitor and the third capacitor form the current transformer CT. Compared with the traditional coupled current transformer CT, the current signal output from its current signal output terminal is more accurate and is not or rarely affected by external interference.

[0016] In addition, for the mobile substation of the present invention, all its components are arranged inside the substation installation box, which avoids damage to the substation caused by the natural environment. Moreover, the mobile substation of the present invention can be lifted by a lifting ring to adjust the position of the mobile substation, or the mobile substation can be moved onto a movable device (such as a heavy truck) and transported to a designated position. Therefore, the mobility of the mobile substation of the present invention is realized. Brief Description of the Drawings

[0017] Figure 1A is a schematic structural diagram of the first embodiment of the mobile substation of the present invention;

[0018] Figure 1B is a schematic structural diagram of the transformer bushing of the mobile substation of the present invention;

[0019] Figure 2A is a schematic structural diagram of the second embodiment of the mobile substation of the present invention, where the isolating switch is closed with the cable terminal and the circuit breaker is closed;

[0020] Figure 2B is a schematic structural diagram of the second embodiment of the mobile substation of the present invention, where the isolating switch is disconnected from the cable terminal and the circuit breaker is disconnected;

[0021] Figure 2C is a schematic assembly structural diagram of the transformer bushing and the transformer of the present invention. Detailed Embodiments

[0022] The following further describes the specific embodiments of the mobile substation of the present invention in conjunction with the Figures 1A - 2C embodiments given. The mobile substation of the present invention is not limited to the descriptions of the following embodiments.

[0023] The mobile substation of the present invention includes a transformer T, a transformer bushing 1, a cable terminal 2, an isolating switch 3, a driving device 4, and a low-voltage control device CRL; the input end of the transformer T is electrically connected to one end of the isolating switch 3 through the transformer bushing 1, the other end of the isolating switch 3 is matched with one end of the cable terminal 2, and the other end of the cable terminal 2 is connected to an external circuit through a cable 6; the driving device 4 is drivingly connected to the isolating switch 3 to drive the isolating switch 3 to be closed / open with the cable terminal 2.

[0024] The transformer bushing 1 includes a conductor 10a, a first insulating core 11a, a potential transformer PT and a current transformer CT arranged on the first insulating core 11a, a circuit breaker 12a, and a first insulating pull rod 120a; the circuit breaker 12a includes a moving contact and a static contact used in cooperation, the static contact is electrically connected to the input end of the transformer T through the conductor 10a, the driving device 4 is drivingly connected to the moving contact through the first insulating pull rod 120a to drive the moving contact to be closed / open with the static contact, and the moving contact is also electrically connected to the cable terminal 2 through the isolating switch 3; the first insulating core 11a wraps the conductor 10a and the circuit breaker 12, and the first insulating core 11a includes a main insulation capacitor embedded therein, the main insulation capacitor includes a first capacitor C1 and a second capacitor C2 located at both ends of the first insulating core 11a, and both the first capacitor C1 and the second capacitor C2 are composed of a plurality of coaxial capacitor screens with gradually increasing diameters and arranged alternately with insulating layers; the first insulating core (11a) further includes a third capacitor embedded therein, the third capacitor is located outside the main insulation capacitor and is connected in series with it, the third capacitor is composed of a plurality of capacitor screens with gradually increasing diameters and arranged alternately with insulating layers, or the third capacitor is a capacitor tap of the main insulation capacitor; one end of the third capacitor connected to the main insulation capacitor is the current signal output end, and the other end is grounded, and the third capacitor and the main insulation capacitor form the current transformer CT.

[0025] In the mobile substation of the present invention, the transformer bushing 1 includes a potential transformer PT, a current transformer CT, and a circuit breaker 12a, integrating multiple electrical components into the transformer bushing 1 significantly reduces the number of components of the mobile substation of the present invention and simplifies the installation operation; moreover, the transformer bushing 1 includes a first insulating core 11a, and a main insulation capacitor and a third capacitor are embedded in the first insulating core 11a. The main insulation capacitor and the third capacitor form the current transformer CT. Compared with the traditional coupled current transformer CT, the current signal output by the current signal output end is more accurate and is not or rarely affected by external interference.

[0026] Preferably, as Figure 1B shown, the potential transformer PT is a coreless coil or a core coil, and it is sleeved outside the middle of the first insulating core 11a.

[0027] Preferably, as Figure 1A and2A As shown in Fig. -2C, the mobile substation of the present invention further includes a substation installation box H. The substation installation box H includes an installation box bottom plate H0, and a plurality of lifting rings H01 are provided on the installation box bottom plate H0. The transformer T, the transformer bushing 1, the cable terminal 2, the isolating switch 3, the operating mechanism 4, and the low-voltage control device CRL are all arranged inside the substation installation box H. For the mobile substation of the present invention, all its components are arranged inside the substation installation box H, which avoids damage to the substation caused by the natural environment. Moreover, the mobile substation of the present invention can be lifted through the lifting rings H01 to adjust the position of the mobile substation, or the mobile substation can be moved onto a movable device (such as a heavy truck) and transported to a designated position. Therefore, the mobility of the mobile substation of the present invention is realized.

[0028] Preferably, as Figure 1B shown, the transformer bushing 1 further includes a lightning arrester valve plate group 14a. The lightning arrester valve plate group 14a is sleeved outside the first insulating pull rod 120a, and the lightning arrester valve plate group 14a and the first insulating core 11a are respectively located at both ends of the transformer bushing 1. One end of the lightning arrester valve plate group 14a adjacent to the first insulating core 11a is electrically connected to the moving contact, and the other end is grounded. The transformer bushing of the present invention integrates a potential transformer PT, a current transformer CT, a circuit breaker 12a, and a lightning arrester valve plate group 14a, so that the mobile substation of the present invention does not need to additionally set up a high-voltage switch cabinet, thereby simplifying the structure of the mobile substation, reducing the installation space occupied by the mobile substation, and simplifying the assembly operation of the mobile substation. Further, as Figure 1A and 1B shown, the driving device 4 includes a permanent magnet mechanism 16a. The permanent magnet mechanism 16a is drivingly connected to the moving contact through the first insulating pull rod 120a to drive the moving contact to be closed / opened with the static contact; the driving device 4 further includes a second insulating pull rod 41 and an operating mechanism 44. The operating mechanism 44 is drivingly connected to the isolating switch 3 through the second insulating pull rod 41 to drive the isolating switch 3 to swing, so that the isolating switch 3 is closed / opened with the cable terminal 2; the permanent magnet mechanism 16a and the operating mechanism 44 are respectively electrically connected to the low-voltage control device CRL.

[0029] Preferably, as Figure 2A and 2BAs shown, the driving device 4 includes a tripping lever 40, a second insulating pull rod 41, a stopper 42, and a linkage main shaft 43. The middle of the tripping lever 40 is rotatably arranged. One end is connected to the first insulating pull rod 120a, and the other end is hinged to one end of the second insulating pull rod 41. The other end of the second insulating pull rod 41 is drivingly connected to the linkage main shaft 43. The middle of the second insulating pull rod 41 is also drivingly connected to the isolating switch 3. The linkage main shaft 43 is arranged on the transformer T. The low-voltage control device CRL controls the action of the linkage main shaft 43. The linkage main shaft 43 drives the tripping lever 40 and the isolating switch 3 to swing through the second insulating pull rod 41, so that the isolating switch 3 is closed / open with the cable terminal 2. At the same time, the tripping lever 40 drives the circuit breaker 12a to be closed / open through the first insulating pull rod 120a. Further, the mobile substation of the present invention further includes a lightning arrester disc group 14a sleeved outside the insulating pull rod 41. One end of the lightning arrester disc group 14a is electrically connected to the isolating switch 3, and the other end is grounded.

[0030] As Figure 1A and 2A shown, it is the first embodiment of the mobile substation of the present invention.

[0031] As Figure 1A shown, the mobile substation of the present invention includes a transformer T, a transformer bushing 1, a cable terminal 2, an isolating switch 3, a driving device 4, and a low-voltage control device CRL. The input end of the transformer T is connected to one end of the isolating switch 3 through the transformer bushing 1. The other end of the isolating switch 3 cooperates with one end of the cable terminal 2. The other end of the cable terminal 2 is connected to an external circuit through a cable 6. The driving device 4 is drivingly connected to the isolating switch 3 to drive the isolating switch 3 to be closed / open with the cable terminal 2. The transformer bushing 1 includes a conductor 10a, a first insulating core 11a, a potential transformer PT and a current transformer CT arranged on the first insulating core 11a, a circuit breaker 12a, a first insulating pull rod 120a, and a lightning arrester disc group 14a. The circuit breaker 12a includes a moving contact and a static contact that are used in cooperation. The static contact is electrically connected to the input end of the transformer T through the conductor 10a. The driving device 4 is drivingly connected to the moving contact through the first insulating pull rod 120a to drive the moving contact to be closed / open with the static contact. The moving contact is also electrically connected to the cable terminal 2 through the isolating switch 3. The first insulating core 11a wraps outside the conductor 10a and the circuit breaker 12a. The lightning arrester bushing 14a is sleeved outside the first insulating pull rod 120a, and the lightning arrester disc group 14a and the first insulating core 11a are respectively located at both ends of the transformer bushing 1. One end of the lightning arrester disc group 14a connected to the first insulating core 11a is electrically connected to the moving contact, and the other end is grounded.

[0032] Preferably, as Figure 1BAs shown, the driving device 4 includes a permanent magnet mechanism 16a. The permanent magnet mechanism 16a is drivingly connected to the moving contact through a first insulating pull rod 120a to drive the moving contact to close / open with the static contact; As Figure 1A shown, the driving device 4 further includes a second insulating pull rod 41 and an operating mechanism 44. The operating mechanism 44 is drivingly connected to the isolating switch 3 through the second insulating pull rod 41 to drive the isolating switch 3 to swing, so that the isolating switch 3 closes / opens with the cable terminal 2; The permanent magnet mechanism 16 and the operating mechanism 44 are respectively electrically connected to the low-voltage control device CRL. Further, as Figure 1B shown, the permanent magnet mechanism 16a is connected to the first insulating pull rod 120a through an elastic buffer structure to avoid hard contact between the moving contact and the static contact, and provides sufficient pressure for the moving contact, so that the moving contact and the static contact cooperate reliably.

[0033] Preferably, as Figure 1B shown, the transformer bushing 1 further includes a terminal 121a. The terminal 121a is arranged between the arrester disc group 14a and the first insulating core 11a. The terminal 121a is electrically connected to the moving contact through a flexible current-carrying connection 122a. The terminal 121a is also respectively electrically connected to the arrester disc group 14a and the isolating switch 3.

[0034] Preferably, as Figure 1B shown, the transformer bushing 1 further includes a first insulating outer sheath 130a sleeved on the first insulating core 11a and a second insulating outer sheath 131a sleeved outside the arrester disc group 14. Further, as Figure 1B shown, a second insulating core is sleeved outside the arrester disc group 14a. The second insulating core is located between the arrester disc group 14a and the second insulating outer sheath 131a.

[0035] Preferably, as Figure 1B shown, the transformer bushing 1 further includes a first flange 15a. The first flange 15a is sleeved on the lower end of the transformer bushing 1 and is located outside the second capacitor C2. The transformer bushing 1 is fixedly connected to the transformer T through the first flange 15a; The lower end of the second insulating core is connected to the upper end of the first insulating core 11a through a second flange group; The upper end of the second insulating core is connected to the lower end of the elastic buffer structure through a third flange group, and the upper end of the elastic buffer structure is connected to the permanent magnet mechanism 16a through a fourth flange group.

[0036] Specifically, as Figure 1AIn the shown direction, the lower end of the transformer bushing 1 is connected to the input end of the transformer T. The right end of the isolating switch 3 is connected to the terminal 121a in the middle of the transformer bushing 1. The left end of the isolating switch 3 is cooperated with the upper end of the cable terminal 2. The lower end of the cable terminal 2 is connected to the external circuit through the cable 6. The output end of the transformer T is connected through the low-voltage control device CRL. The upper end of the second insulating pull rod 41 of the driving device 44 is hinged to the middle of the isolating switch 3. The lower end of the second insulating pull rod 41 is connected to the operating mechanism 44 of the driving device 4. The operating mechanism 44 is fixed on the side wall H1 of the substation installation box H; As Figure 1B In the shown direction, in the transformer bushing 1, the permanent magnet mechanism 16, the first insulating pull rod 120a, the circuit breaker 12a, and the conductor 10a are arranged in sequence from top to bottom and are connected in sequence. The lower end of the conductor 10a is connected to the input end of the transformer T. The terminal 121a is arranged between the first insulating core 11a and the arrester valve plate group 14a and is electrically connected to the moving contact of the circuit breaker 12a through the diversion flexible connection 122a. The first mounting flange 15a is sleeved outside the lower end of the first insulating core 11a.

[0037] Preferably, as Figure 1B shown, the first insulating core 11a includes a main insulation capacitor embedded therein. The main insulation capacitor includes a first capacitor C1 and a second capacitor C2 located at both ends of the first insulating core 11a. Both the first capacitor C1 and the second capacitor C2 are composed of a plurality of coaxial capacitor screens with gradually increasing diameters and are alternately arranged with the insulating layer. Preferably, the first capacitor C1 and the second capacitor C2 share the outermost capacitor screen; The first insulating core 11a further includes a third capacitor embedded therein. The third capacitor is located outside the main insulation capacitor and is connected in series with it. The third capacitor is composed of a plurality of capacitor screens with gradually increasing diameters and is alternately arranged with the insulating layer, or the third capacitor is a capacitor tap of the main insulation capacitor; One end of the third capacitor connected to the main insulation capacitor is the current signal output end, and the other end is grounded. The third capacitor and the main insulation capacitor form a current transformer CT; The capacitor C2 is preferably a capacitor tap of the main insulation capacitor, which is beneficial to simplifying the structure and manufacturing cost of the first insulating core 11a and improving the production efficiency of the first insulating core 11a. Further, as Figure 1B shown, for the multiple capacitor screens of the first capacitor C1, from the innermost capacitor screen to the outermost capacitor screen, they are offset from the terminal 121a in sequence towards the direction where the circuit breaker 12a is located; For the multiple capacitor screens of the second capacitor C2, from the innermost capacitor screen to the outermost capacitor screen, they are offset from the end where the conductor 10a is connected to the transformer T in sequence towards the direction where the circuit breaker 12 is located.

[0038] Preferably, as Figure 1B shown, the third capacitor is composed of a plurality of capacitor screens connected in parallel, that is, among the multiple capacitor screens of the third capacitor, the grounded capacitor screens and the capacitor screens connected to the current signal output end are alternately arranged in sequence.

[0039] It should be noted that when the third capacitor is the capacitive tap of the main insulation capacitor, the third capacitor is the capacitive tap taken from the second-to-last capacitor screen (or the nth-to-last capacitor screen, where n > 2 and n is an integer) of the main insulation capacitor, and the third capacitor is the capacitor formed by the last two capacitor screens (or n capacitor screens) of the main insulation capacitor.

[0040] A preferred solution is that the first insulating core 11a uses glass fiber impregnated with epoxy resin as the insulating layer, and a semi-conductive tape or a metal tape as the capacitor screen, and the first insulating core 11a is formed by alternately winding the insulating layer and the capacitor screen. Of course, the first insulating core 11a can also be formed by sequentially stacking and pouring a group of cylindrical capacitor screens.

[0041] Preferably, as Figure 1A shown, the low-voltage control device CRL is a low-voltage switchgear cabinet, and the low-voltage switchgear cabinet includes a main circuit breaker CB1 and a branch circuit breaker CB2 connected in series with the output terminal of the transformer T in sequence.

[0042] Preferably, as Figure 1A shown, the mobile substation of the present invention further includes a substation installation box H, and the substation installation box H includes an installation box bottom plate H0. A plurality of lifting rings H01 are provided on the installation box bottom plate H0. The transformer T, the transformer bushing 1, the cable terminal 2, the disconnecting switch 3, the driving device 4, and the low-voltage control device CRL are all arranged in the substation installation box H. Further, as Figure 1A shown, the transformer and the low-voltage control device CRL are both arranged on the installation box bottom plate HO; the substation installation box H further includes an installation box side wall H1, an installation box top wall H2, and a partition wall H3. The lower end of the partition wall H3 is arranged on the transformer T between the input end and the output end of the transformer T, and the upper end of the partition wall H3 cooperates with the installation box top wall H2. The input end of the transformer T, the transformer bushing 1, the cable terminal 2, the disconnecting switch 3, the driving device 4, and the arrester disc group 14a are all located on one side of the partition wall H3, and the output end of the transformer T and the low-voltage control device CRL are located on the other side of the partition wall H3. The partition wall 3 separates the high-voltage part and the low-voltage part of the mobile substation, which is beneficial to improving the safety of electricity use and is also beneficial to increasing the insulation distance between the high-voltage side and the low-voltage side.

[0043] As Figures 2A - 2C shown, it is the second embodiment of the mobile substation of the present invention.

[0044] The difference between the mobile substation of this embodiment and the first embodiment lies in that: the driving device 4 includes a tripping lever 40, a second insulating pull rod 41, a stopper 42 and a linkage large shaft 43. The middle of the tripping lever 40 is rotatably arranged. One end is connected to the first insulating pull rod 120a, and the other end is hinged to one end of the second insulating pull rod 41. The other end of the second insulating pull rod 41 is drivingly connected to the linkage large shaft 43. The middle of the second insulating pull rod 41 is also connected to the isolating switch 3. The linkage large shaft 43 is arranged on the transformer T. The low-voltage control device CRL controls the action of the linkage large shaft 43. The linkage large shaft 43 drives the tripping lever 40 and the isolating switch 3 to swing through the second insulating pull rod 41, so that the isolating switch 3 is closed / open with the cable terminal 2. At the same time, the tripping lever 40 drives the circuit breaker 12a to be closed / open through the first insulating pull rod 120a. The transformer bushing 1 does not include an arrester disc group 14a. The arrester disc group 14a is sleeved outside the second insulating pull rod 41 of the driving device 4. One end of the arrester disc group 14a is connected to the isolating switch 3, and the other end is grounded. Further, a third insulating outer sheath 132a is also arranged outside the arrester disc group 14a. Further, as Figure 2A shown, when the isolating switch 3 is closed with the cable terminal 2 and the circuit breaker 12a is closed, the tripping lever 40 is parallel to the isolating switch 3.

[0045] Preferably, the low-voltage control device CRL is a low-voltage controller, which provides a low-voltage power supply for the low-voltage switch cabinet and is the prior art and will not be elaborated herein.

[0046] Specifically, as Figure 2A shown in the direction, the mating end 20 at the upper end of the isolating switch 3 is closed with the cable terminal 2, the circuit breaker 12a is closed, the tripping lever 40 is in a horizontal state, its left end is connected to the first insulating pull rod 120a, the middle is rotatably arranged, the right end is hinged to the upper end of the second insulating pull rod 41, and the included angle between the tripping lever 40 and the second insulating pull rod 41 is <90°. The middle of the second insulating pull rod 41 is hinged to the isolating switch 3, and the lower end is connected to the linkage large shaft 43. The low-voltage control device CRL controls the action of the linkage large shaft 43. The linkage large shaft 43 drives the second insulating pull rod 41 to move obliquely downward (right downward). The second insulating pull rod 41 drives the left end of the tripping lever 40 and the left end of the isolating switch 3 to swing downward, so that the isolating switch 3 is disconnected from the cable terminal 2 and the circuit breaker 12a is disconnected, and the driving device 4 enters the state shown in Figure 2.

[0047] When the mobile substation of the present invention is in use, its cable terminal 2 can be connected to the GIS fully enclosed electrical apparatus through the cable 6, so that the high-voltage power supply is input into the mobile substation.

[0048] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A mobile substation, which comprises a transformer (T), transformer bushings (1), cable terminals (2), isolating switches (3), a driving device (4) and a low-voltage control device (CRL); characterized in that: The input end of the transformer (T) is electrically connected to one end of the isolating switch (3) through the transformer bushing (1). The other end of the isolating switch (3) is mated with one end of the cable terminal (2). The other end of the cable terminal (2) is connected to the external circuit through the cable (6). The driving device (4) is drivingly connected to the isolating switch (3) to drive the isolating switch (3) to be closed / open with the cable terminal (2). The transformer bushing (1) includes a conductor (10a), a first insulating core (11a), a potential transformer PT and a current transformer CT arranged on the first insulating core (11a), a circuit breaker (12a), and a first insulating pull rod (120a). The circuit breaker (12a) includes a moving contact and a static contact used in cooperation. The static contact is electrically connected to the input end of the transformer (T) through the conductor (10a). The driving device (4) is drivingly connected to the moving contact through the first insulating pull rod (120a) to drive the moving contact to be closed / open with the static contact. The moving contact is also electrically connected to the cable terminal (2) through the isolating switch (3). The first insulating core (11a) wraps the conductor (10a) and the circuit breaker (12a). The first insulating core (11a) includes a main insulation capacitor embedded therein. The main insulation capacitor includes a first capacitor C1 and a second capacitor C2 located at both ends of the first insulating core (11a). Both the first capacitor C1 and the second capacitor C2 are composed of a plurality of coaxial capacitor screens with gradually increasing diameters and arranged alternately with insulating layers. The first insulating core (11a) further includes a third capacitor embedded therein. The third capacitor is located outside the main insulation capacitor and is connected in series with it. The third capacitor is composed of a plurality of capacitor screens with gradually increasing diameters and arranged alternately with insulating layers, or the third capacitor is a capacitor tap of the main insulation capacitor. One end of the third capacitor connected to the main insulation capacitor is the current signal output end, and the other end is grounded. The third capacitor and the main insulation capacitor form the current transformer CT.

2. The mobile substation according to claim 1, characterized in that: The transformer bushing (1) further includes a lightning arrester disc group (14a). The lightning arrester disc group (14a) is sleeved outside the first insulating pull rod (120a), and the lightning arrester disc group (14a) and the first insulating core (11a) are respectively located at both ends of the transformer bushing (1). One end of the lightning arrester disc group (14a) adjacent to the first insulating core (11a) is electrically connected to the moving contact, and the other end is grounded.

3. The mobile substation according to claim 2, wherein: The driving device (4) includes a permanent magnet mechanism (16a). The permanent magnet mechanism (16a) is drivingly connected to the moving contact through the first insulating pull rod (120a) to drive the moving contact to be closed / open with the static contact. The driving device (4) further includes a second insulating pull rod (41) and an operating mechanism (44). The operating mechanism (44) is drivingly connected to the isolating switch (3) through the second insulating pull rod (41) to drive the isolating switch (3) to swing, so that the isolating switch (3) is closed / open with the cable terminal (2). The permanent magnet mechanism (16a) and the operating mechanism (44) are respectively electrically connected to the low-voltage control device (CRL).

4. The mobile substation according to claim 2, characterized in that: The transformer bushing (1) further includes a terminal (121a), which is arranged between the arrester valve disc group (14a) and the first insulating core body (11a). The terminal (121a) is electrically connected to the moving contact through a flexible current-carrying connection (122a), and is also electrically connected to the arrester valve disc group (14a) and the isolating switch (3) respectively.

5. The mobile substation according to claim 1, characterized in that: The driving device (4) includes a tripping lever (40), a second insulating pull rod (41), a stopper (42) and a linkage main shaft (43). The middle part of the tripping lever (40) is rotatably arranged. One end is connected to the first insulating pull rod (120a), and the other end is hinged to one end of the second insulating pull rod (41). The other end of the second insulating pull rod (41) is drivingly connected to the linkage main shaft (43), and the middle part of the second insulating pull rod (41) is also drivingly connected to the isolating switch (3). The linkage main shaft (43) is arranged on the transformer (T). The low-voltage control device (CRL) controls the action of the linkage main shaft (43). The linkage main shaft (43) drives the tripping lever (40) and the isolating switch (3) to swing through the second insulating pull rod (41), so that the isolating switch (3) is closed / open with the cable terminal (2), and at the same time, the tripping lever (40) drives the circuit breaker (12a) to be closed / open through the first insulating pull rod (120a).

6. The mobile substation according to claim 5, wherein: When the isolating switch (3) is closed with the cable terminal (2) and the circuit breaker (12a) is closed, the tripping lever (40) is parallel to the isolating switch (3).

7. The mobile substation according to claim 5, characterized in that: It further includes an arrester valve disc group (14a) sleeved outside the insulating pull rod (41). One end of the arrester valve disc group (14a) is electrically connected to the isolating switch (3), and the other end is grounded.

8. The mobile substation according to claim 1, characterized in that: The potential transformer PT is a coreless coil or a core coil, and is sleeved outside the middle part of the first insulating core body (11a) and located outside the second capacitor C2.

9. The mobile substation according to claim 2 or 7, characterized in that : It further includes a substation installation box (H), which includes an installation box bottom plate (H0). A plurality of lifting rings (H01) are provided on the installation box bottom plate (H0). The transformer (T), the transformer bushing (1), the cable terminal (2), the isolating switch (3), the driving device (4) and the low-voltage control device (CRL) are all arranged in the substation installation box (H).

10. The mobile substation according to claim 9, wherein: The transformer (T) and the low-voltage control device (CRL) are both arranged on the installation box bottom plate (H0). The substation installation box (H) further includes an installation box side wall (H1), an installation box top wall (H2) and a partition wall (H3). The lower end of the partition wall (H3) is arranged on the transformer (T) between the input end and the output end of the transformer (T). The upper end of the partition wall (H3) cooperates with the installation box top wall (H2). The input end of the transformer (T), the transformer bushing (1), the cable terminal (2), the isolating switch (3), the driving device (4) and the arrester valve disc group (14a) are all located on one side of the partition wall (H3), and the output end low-voltage control device (CRL) of the transformer (T) is located on the other side of the partition wall (H3).

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