A bushing type electronic mutual inductor for ring network cabinet and its auxiliary installation equipment

Abstract

The present invention discloses an auxiliary installation device for a bushing-type electronic transformer for a ring network cabinet, wherein a main box is installed on one side of the transformer body, a sliding plug is symmetrically and slidably installed inside the main box, a pull rod is installed in the middle of the side end face of the sliding plug, and the pull rod is slidably connected to the main box, a frame rod is slidably installed on the end of the pull rod, one end of the frame rod is rotatably installed with a limited seat, and the other end of the frame rod is rotatably installed with a base. The present invention improves the stability of various orientation bolts installed on the transformer body, improves the balance of load force provided by each bolt, effectively solves the warping and misalignment phenomena, indirectly improves the stability of the transformer body in later use, and can make the torsional force borne by the bolts during installation more compatible and matched with the compressive performance of the ring network cabinet and the transformer body, effectively avoids the thread slippage phenomenon, and improves the flexibility, efficiency, convenience, reliability and efficiency of the bolt assembly work.

Description

Technical Field

[0001] The invention relates to the technical field of electronic transformer installation equipment, in particular to a bushing-type electronic transformer for a ring network cabinet and auxiliary installation equipment thereof. Background Art

[0002] Unlike traditional large-scale power stations that are directly connected to the main grid, new energy power stations need to be connected through the distribution network due to their large number and wide distribution. As an important access equipment, the power ring main cabinet still uses the traditional solution based on electromagnetic transformers;

[0003] However, the electronic transformer auxiliary installation equipment currently on the market is not only unable to effectively limit the fitting pressure, resulting in the transformer body being installed unreliably, but also easily damaging the internal components due to improper tightening during the installation process. Due to the asynchronous tightening force of each bolt and the uncoordinated feed of each bolt, warping and misalignment are also prone to occur, causing the transformer body to be easily damaged due to local force imbalance during installation and subsequent use, and easily shaking or even falling off due to the different locking force of each bolt, which can easily affect the stability of use and effective service life of the transformer. Summary of the invention

[0004] The present invention provides a bushing-type electronic transformer for a ring network cabinet and an auxiliary installation device thereof, which can effectively solve the problem that the auxiliary installation device of the electronic transformer currently on the market proposed in the above background technology is not only unable to effectively limit the fitting pressure, resulting in the transformer body being installed unreliably, but also easily damaging the internal components due to improper tightening during the installation process. Since the tightening force of each bolt is not synchronized and the feed of each bolt is not coordinated, it is also easy to cause warping and misalignment, resulting in the transformer body being easily damaged due to local force imbalance during installation and subsequent use, and easily shaking or even falling off due to the different locking forces of each bolt, which easily affects the use stability and effective service life of the transformer.

[0005] To achieve the above object, the present invention provides the following technical solutions: an auxiliary installation device for a bushing-type electronic transformer for a ring main unit, comprising a main box, a dynamic protection mechanism is installed on the outside of the main box, and the dynamic protection mechanism performs adaptive auxiliary installation on the transformer body;

[0006] The dynamic protection mechanism includes a main box, a sliding plug, a pull rod, a frame rod, a limit seat, a machine base, a mounting seat, a motor, a rotating drum, a synchronous wheel, a transmission belt, a threaded ring, a screw rod, a bolt clamp, a piston ring, a spacer ring, a screw rod, a sliding rod, a switch, an air pump, an air pipe, a sub-box, a blocking block, an exhaust groove, a connection box and a connection pipe;

[0007] A main box is installed on one side of the transformer body, and a sliding plug is symmetrically and slidably installed inside the main box. A pull rod is installed in the middle of the side end face of the sliding plug, and the pull rod is slidably connected to the main box. A frame rod is slidably installed on the end of the pull rod, one end of the frame rod is rotatably installed with a limited seat, and the other end of the frame rod is rotatably installed with a machine base. A mounting seat is installed in the middle of the side end face of the machine base, and a motor is embedded and installed on the top of the side end face of the mounting seat. A number of rotating drums are rotatably installed at the edge of the side end face of the mounting seat at equal angles along the circumferential direction. Synchronous wheels are installed on the ends of the motor output shaft and the ends of the rotating drum, and the synchronous wheels are rotatably connected with the mounting seat, and a transmission belt is sleeved on the outer side of the synchronous wheel;

[0008] A threaded ring is slidably installed inside the drum, a screw is installed on the side end face of the threaded ring through a thread, and the screw is rotatably connected to the end of the drum, a bolt clamp is installed on the end of the screw, a connecting pipe is installed on the bottom of the side end face of the mounting seat, a screw is embedded and rotatably installed on the top of the side end face of the machine base, a piston ring is slidably installed in the inner cavity of the machine base, and the screw is connected to the piston ring through a thread, an isolation ring is slidably installed in the inner cavity of the mounting seat, a sliding rod is installed on the top of the side end face of the isolation ring, and the sliding rod is slidably connected to the mounting seat, and a switch is installed at the position of the side end face of the machine base corresponding to the sliding rod;

[0009] An air pump is installed in the middle of the top of the main box, air pipes are symmetrically installed on both sides of the top of the main box, an auxiliary box is installed in the middle of the bottom of the main box, blocks are symmetrically slidably installed inside the auxiliary box, exhaust grooves are symmetrically opened at the bottom of the auxiliary box, and connection boxes are installed at both ends of the auxiliary box.

[0010] Preferably, the pull rod includes a long rod and a short rod, the long rod is located on one side of the limit seat, and the short rod is located on one side of the machine base. The length of the long rod is greater than the length of the transformer body, the difference between the length of the long rod and the length of the main box is less than the length of the transformer body, and the length of the short rod is less than the length of the transformer body.

[0011] Preferably, a central clamping rod is installed in the middle of the side end surface of the limit seat, and an extended clamping ring is installed at the bottom of the side end surface of the limit seat. The limit seat, the central clamping rod and the extended clamping ring are all matched with the transformer body.

[0012] Preferably, the air outlet of the air pump is connected to the inner cavity of the main box through an air supply pipe, a filter box is installed at the air inlet of the air pump, a valve is embedded and installed in the middle of the side end surface of the auxiliary box between two blocks, the interior of the auxiliary box between the two blocks is filled with air, the width of the block is larger than the width of the exhaust groove, the inner cavity of the auxiliary box is connected to the inner cavity of the main box through a connecting box, and the input end of the air pump is electrically connected to the output end of an external power supply.

[0013] Preferably, a pressure gauge is embedded in the top edge of the base, the inner cavity of the base is connected to the inner cavity of the mounting seat through a connecting pipe, the connecting pipe and the inner cavity of the mounting seat are filled with air at a position between the piston ring and the isolation ring, the synchronous wheel is a hollow wheel, the inner cavity of the mounting seat is connected to the inner cavity of the rotating drum through the synchronous wheel, the inner cavity of the mounting seat is filled with hydraulic fluid at a position between the isolation ring and the threaded ring, a magnetic attraction ring is embedded in the side end face edge of the bolt clamp, the switch is an external power sleep switch, and the motor and switch input ends are electrically connected to the external power output end.

[0014] Preferably, a card point auxiliary mechanism is installed outside the dynamic protection mechanism, and the card point auxiliary mechanism includes a support, a guide rod, a threaded rod, a bottom plate, a universal wheel, an electromagnet, a ball, a collar, a connecting block, a connector, a movable rod, a bar box, a limit block, a driven gear, a driving gear and a toothed chain;

[0015] A support is clamped on the outside of the main box, a bottom plate is installed at the bottom of the support, a threaded rod is rotatably installed on one side of the top of the bottom plate, and the threaded rod is connected to the support through a thread, a guide rod is installed on the other side of the top of the bottom plate, and the guide rod is slidably connected to the support, a universal wheel is installed at the corner of the bottom end of the bottom plate, an electromagnet is embedded and installed on the edge of the side end surface of the bottom plate, and a plurality of balls are evenly embedded and rolled at an equidistant position on the side end surface of the bottom plate located at the inner side of the electromagnet, and the radius of the ball is greater than the thickness of the electromagnet;

[0016] The outer curved surface of the machine base is rotatably sleeved with a collar, the middle part of the side end face of the limit seat is rotatably installed with a connecting block, the other end of the frame rod is installed with a connecting head, the side end face of the connecting head is embedded with a movable rod rotatably installed, a strip box is installed at the position of the movable rod on one side of the main box, a limiting block is slidably installed inside the strip box, and the limiting block is fixedly connected to the movable rod, a driven gear is installed on the limiting seat and the middle part of the side end face of the machine base, a driving gear is installed on the end of the movable rod, a tooth chain is sleeved on the outside of the driving gear, and the driving gear is connected to the driven gear through the tooth chain.

[0017] A bushing-type electronic transformer for a ring main unit comprises a transformer body, one end of which is provided with a conical epoxy resin body, a plurality of secondary signal nuts are evenly embedded and installed at positions of an outer curved surface of the transformer body close to one side of the conical epoxy resin body, and a circuit board is fixedly installed at the end of the secondary signal nut by screws;

[0018] A current conductor is inserted into the transformer body, a phase current coil is sleeved at a position outside the current conductor inside the transformer body, a zero-sequence current coil is sleeved at a position outside the current conductor at one side of the phase current coil, a through-type high-voltage capacitor is sleeved at a position outside the current conductor at one side of the zero-sequence current coil, a secondary capacitor is welded on one side of the circuit board, a number of error adjustment capacitors are uniformly welded at an equal distance in the middle of the circuit board, a secondary signal line is embedded and installed at the bottom of the end surface of the transformer body, and one end of the secondary signal line is electrically connected to the circuit board;

[0019] A voltage-equalizing network is sleeved on the outside of the through-type high-voltage capacitor, a fixing nut is installed at the position of the bolt clamp corresponding to the end face of the transformer body, and the fixing nut is welded to the voltage-equalizing network, a sealing ring is embedded and installed at the position outside the fixing nut on the end face of the transformer body, and a temperature sensor module is embedded and installed at the end of the conical epoxy resin body.

[0020] Preferably, the current wire is a copper wire, the current wire is sealed in the center of the transformer body, the two ends of the current wire are processed with screw holes, the phase current coil and the zero-sequence current coil are composed of an iron core and an enameled wire wound on the iron core, and the ends of the phase current coil and the zero-sequence current coil are connected to the secondary signal nut

[0021] Preferably, the inner electrode of the through-type high-voltage capacitor is electrically connected to the current conductor, the outer electrode of the through-type high-voltage capacitor is connected to an electrode of the secondary capacitor, the other electrode of the secondary capacitor is grounded, the connecting ends of the through-type high-voltage capacitor and the secondary capacitor are both connected to the secondary signal nut, and the secondary capacitor is connected in parallel with the error adjustment capacitor.

[0022] Preferably, the temperature sensing module has a coil that can sense the current flowing through the current conductor, the temperature sensing module is tightly fitted to the current conductor, and the temperature sensing module works on the equipotential high voltage side.

[0023] Compared with the prior art, the invention has the following beneficial effects: the invention has a scientific and reasonable structure and is safe and convenient to use;

[0024] 1. A dynamic protection mechanism is provided. The driving force can be converted by the cooperation of the machine base, the mounting base, the isolation ring, the rotating drum, the threaded ring, the screw rod and the bolt clamp. With the transmission effect of the synchronous wheel and the transmission belt, the driving force provided by the motor can be used to realize the synchronous tightening of the bolts at the end of the transformer body, which not only greatly improves the convenience of installing each bolt, so that each bolt can fix and lock the transformer body more quickly and efficiently, but also greatly improves the stability of the bolts in various directions installed on the transformer body, improves the balance and consistency of the load force provided by each bolt, makes the transformer body more uniform in force, effectively solves the warping and dislocation phenomena, avoids the bolts from being stuck due to asynchronous installation, and indirectly improves the stability of the transformer body in later use;

[0025] On the other hand, it can cooperate with the piston ring and the screw rod. During the bolt assembly process, the torsional force borne by the bolt can be adjusted and limited according to the actual situation, which greatly improves the force stability during the bolt assembly process, and makes the torsional force borne by the bolt during the installation process more compatible with the compressive performance of the ring network cabinet and the transformer body. It can be suitable for the installation of transformer bodies of different strengths. The torsional force of the bolt can be accurately adjusted according to actual needs, which makes the locking and installation work of the bolt more stable, gives full play to the compressive performance of the ring network cabinet and the transformer body, and effectively avoids the thread slippage phenomenon, which greatly improves the flexibility, efficiency, convenience, reliability and efficiency of the bolt assembly work.

[0026] 2. The air pump and the air pipe can provide a stable driving force. With the conversion function of the main box, the sliding plug, the pull rod, the frame rod and the limit seat, the air flow pressure can be converted and transmitted. During the installation of the transformer body, the elastic support force and the elastic feed pressure can be given to it, which greatly improves the stability and reliability of the installation of the transformer body, improves the pressure balance of the transformer body, and ensures the full stability of the pressing force;

[0027] With the flow-limiting and guiding function of the auxiliary box, blocking block, exhaust groove, connecting box and connecting pipe, the pressure threshold is limited in real time, which greatly improves the softness and controllability of the clamping force. While improving the stability of the transformer body and avoiding the misalignment and falling off of the transformer body during installation, it effectively improves the safety of various components inside the transformer body during installation, and greatly reduces the pressure loss caused by incompatible clamping force during installation. With the limiting function of the slide rod and switch, the bolt can obtain sufficient and stable screw-in pressure, realize dual regulation of the locking pressure, and make the installation process of the transformer body safer and more reliable.

[0028] 3. A card point auxiliary mechanism is provided. Through the cooperation of the bottom plate, universal wheel, electromagnet and ball, the magnetic suction force can be used to borrow the wall of the ring main unit to straighten the axis direction of the transformer body during the installation process, which effectively simplifies the axis correction process of the transformer body, making the axis correction work of the transformer body more convenient and efficient, and effectively avoids the transformer body from being blocked and damaged due to tilting during the installation process, thereby improving the installation reliability;

[0029] Through the cooperation of the support, guide rod and threaded rod, the installation height of the transformer body can be quickly adjusted. With the sliding adjustment function of the movable rod, strip box, limit block and frame rod, the position of the transformer body can be doubly regulated, which greatly improves the convenience and effectiveness of the alignment installation work. Through the cooperation of the collar, connecting block, connector, movable rod, strip box and limit block, the compatibility of the alignment work and the bolt assembly work can be greatly improved. It can also be equipped with the transmission function of the driven gear, driving gear and tooth chain to assist in the alignment of the bolts, which can make the installation work smoother and more stable, and improve the installation efficiency.

[0030] 4. A transformer body is provided. The conical epoxy resin body can effectively improve the compatibility with the cable plug. With the connection and conduction function of the current conductor, the basic structure of the insulating bushing can be formed. The bushing-type electronic transformer is integrated with the insulating bushing and is still installed at the original position of the insulating bushing. The voltage measurement is realized without adding components. The phase current coil and the zero-sequence current coil are matched to form a current transformer. The through-type high-voltage capacitor and the secondary capacitor are matched to form a voltage transformer. With the regulation function of the error adjustment capacitor, the voltage division ratio can be accurately corrected, which not only effectively improves the measurement accuracy and reliability, but also integrates the voltage transformer and the current transformer into one component, so that the separately installed current transformer is integrated into one component, which also makes the integrity better and the appearance beautiful.

[0031] The coordination of the secondary signal nut, circuit board and secondary signal line can effectively improve the stability and smoothness of signal transmission, and effectively improve the accuracy and effectiveness of measurement work. The coordination of the voltage-equalizing network, fixing nut and sealing ring can improve the fit between the transformer body and the ring main unit during the use of the transformer body, improve the stability of the transformer body, greatly improve the sealing insulation between the transformer body and the ring main unit box, and make the electric field between the high-voltage device inside the transformer and the gas box wall of the ring main unit more uniform.

[0032] When equipped with a temperature sensor module, equipotential and self-power supply are achieved, and the collected current conductor temperature is transmitted to the measurement or protection device through short-distance wireless transmission. Compared with an independent temperature acquisition system in which the temperature acquisition function is only one of the integrated functions, the solution is not only highly integrated, simple and reliable, but also lower in cost.

[0033] In summary, the bushing-type electronic transformer and its auxiliary installation equipment for the ring network cabinet effectively improve the convenience and stability of installation. During the installation process, the bolt assembly process can be accurately limited, and the fitting pressing force of the transformer body and the torsional force of the bolt can be double-limited and regulated, which effectively improves the force balance of various parts of the transformer body, making the locking and fixing work of the transformer more stable and reliable, more efficient and smooth. At the same time, without adding components, the electronic transformer integrates the bushing-type electronic transformer with the insulating bushing, integrates the voltage transformer, current transformer and temperature acquisition system, has the characteristics of low power consumption, wide measurement range and good linearity, and can improve and enhance the range and accuracy of voltage measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0035] In the attached picture:

[0036] Figure 1 It is a schematic diagram of the structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the base plate installation structure of the present invention;

[0038] Figure 3 It is a structural schematic diagram of the dynamic protection mechanism of the present invention;

[0039] Figure 4 It is a schematic diagram of the auxiliary box installation structure of the present invention;

[0040] Figure 5 It is a schematic diagram of the installation structure of the isolation ring of the present invention;

[0041] Figure 6 It is a schematic diagram of the bolt clamp installation structure of the present invention;

[0042] Figure 7 It is a schematic diagram of the structure of the card point auxiliary mechanism of the present invention;

[0043] Figure 8 It is a schematic diagram of the structure of the transformer body of the present invention;

[0044] Numbers in the figure: 100, transformer body; 1, current conductor; 2, phase current coil; 3, zero-sequence current coil; 4, secondary signal nut; 5, through-type high-voltage capacitor; 6, secondary capacitor; 7, error adjustment capacitor; 8, circuit board; 9, secondary signal line; 10, voltage-equalizing network; 11, fixing nut; 12, sealing ring; 13, temperature sensor module; 14, conical epoxy resin body;

[0045] 200, dynamic protection mechanism; 201, main box; 202, slide plug; 203, pull rod; 204, frame rod; 205, limit seat; 206, machine base; 207, mounting seat; 208, motor; 209, rotating drum; 210, synchronous wheel; 211, transmission belt; 212, threaded ring; 213, screw rod; 214, bolt clamp; 215, piston ring; 216, isolation ring; 217, screw rod; 218, slide rod; 219, switch; 220, air pump; 221, air pipe; 222, auxiliary box; 223, block; 224, exhaust groove; 225, connection box; 226, connection pipe;

[0046] 2031, long rod; 2032, short rod; 2051, center clamp rod; 2052, extension clamp ring; 2061, pressure gauge; 2141, magnetic ring; 2201, filter box; 2221, valve;

[0047] 300, card point auxiliary mechanism; 301, support; 302, guide rod; 303, threaded rod; 304, bottom plate; 305, universal wheel; 306, electromagnet; 307, ball bearing; 308, collar; 309, connecting block; 310, connector; 311, movable rod; 312, strip box; 313, limit block; 314, driven gear; 315, driving gear; 316, tooth chain. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0049] Example: Figure 1-7 As shown, the present invention provides a technical solution, an auxiliary installation device for a bushing-type electronic transformer for a ring main unit, comprising a main box 201, a dynamic protection mechanism 200 is installed outside the main box 201, and the dynamic protection mechanism 200 performs adaptive auxiliary installation on the transformer body 100;

[0050] The dynamic protection mechanism 200 includes a main box 201, a sliding plug 202, a pull rod 203, a frame rod 204, a limit seat 205, a machine base 206, a mounting seat 207, a motor 208, a rotating drum 209, a synchronous wheel 210, a transmission belt 211, a threaded ring 212, a screw rod 213, a bolt clamp 214, a piston ring 215, an isolation ring 216, a screw rod 217, a sliding rod 218, a switch 219, an air pump 220, an air pipe 221, a sub-box 222, a block 223, an exhaust groove 224, a connection box 225 and a connection pipe 226;

[0051] A main box 201 is installed on one side of the transformer body 100, and a sliding plug 202 is symmetrically slidably installed inside the main box 201. A pull rod 203 is installed in the middle of the side end surface of the sliding plug 202, and the pull rod 203 is slidably connected to the main box 201. A frame rod 204 is slidably installed at the end of the pull rod 203. A limit seat 205 is rotatably installed at one end of the frame rod 204. A center clamping rod 2051 is installed in the middle of the side end surface of the limit seat 205, and an extension clamping ring 2052 is installed at the bottom of the side end surface of the limit seat 205. The limit seat 205, the center clamping rod 2051 and the extension clamping ring 2052 are all matched with the transformer body 100, so as to provide stable support for the transformer and improve the convenience of installation;

[0052] The end of another rack rod 204 is rotatably mounted with a base 206. The pull rod 203 includes a long rod 2031 and a short rod 2032. The long rod 2031 is located at one side of the limit seat 205, and the short rod 2032 is located at one side of the base 206. The length of the long rod 2031 is greater than the length of the transformer body 100. The difference between the length of the long rod 2031 and the length of the main box 201 is less than the length of the transformer body 100. The length of the short rod 2032 is less than the length of the transformer body 100, so as to perform auxiliary alignment adjustment on the transformer.

[0053] A mounting seat 207 is installed in the middle of the side end surface of the base 206, a motor 208 is embedded and installed on the top of the side end surface of the mounting seat 207, and a plurality of rotating drums 209 are installed on the edge of the side end surface of the mounting seat 207 to rotate at equal angles along the circumferential direction, and synchronous wheels 210 are installed at the ends of the output shafts of the motor 208 and the ends of the rotating drums 209, and the synchronous wheels 210 are rotatably connected to the mounting seat 207, and a transmission belt 211 is sleeved on the outer side of the synchronous wheels 210;

[0054] A threaded ring 212 is slidably installed inside the rotating drum 209, a screw rod 213 is installed on the side end surface of the threaded ring 212 through a thread, and the screw rod 213 is rotatably connected to the end of the rotating drum 209, a bolt clamp 214 is installed on the end of the screw rod 213, a connecting pipe 226 is installed on the bottom of the side end surface of the mounting seat 207, a screw rod 217 is embedded and rotatably installed on the top of the side end surface of the machine base 206, a piston ring 215 is slidably installed in the inner cavity of the machine base 206, and the screw rod 217 is connected to the piston ring 215 through a thread;

[0055] An isolating ring 216 is slidably installed in the inner cavity of the mounting seat 207, a pressure gauge 2061 is embedded in the top edge of the machine base 206, the inner cavity of the machine base 206 is connected to the inner cavity of the mounting seat 207 through a connecting pipe 226, the connecting pipe 226 and the inner cavity of the mounting seat 207 are located between the piston ring 215 and the isolating ring 216 and are filled with air, the synchronous wheel 210 is a hollow wheel, the inner cavity of the mounting seat 207 is connected to the inner cavity of the drum 209 through the synchronous wheel 210, and the inner cavity of the mounting seat 207 is located between the isolating ring 216. The position between the thread ring 212 is filled with hydraulic fluid, a magnetic ring 2141 is embedded and installed on the edge of the side end face of the bolt clamp 214, the switch 219 is an external power sleep switch, the motor 208 and the input end of the switch 219 are electrically connected to the output end of the external power supply, so as to flexibly limit the torsional force, a slide bar 218 is installed on the top of the side end face of the isolation ring 216, and the slide bar 218 is slidably connected with the mounting seat 207, and a switch 219 is installed at the position of the slide bar 218 on the side end face of the machine base 206;

[0056] An air pump 220 is installed in the middle of the top of the main box 201, and air pipes 221 are symmetrically installed on both sides of the top of the main box 201. A sub-box 222 is installed in the middle of the bottom of the main box 201. Blocks 223 are symmetrically slidably installed inside the sub-box 222. Exhaust grooves 224 are symmetrically opened at the bottom of the sub-box 222. The air outlet of the air pump 220 is connected to the inner cavity of the main box 201 through the air pipe 221. A filter box 2201 is installed at the air inlet end of the air pump 220. A valve 2221 is embedded in the middle of the surface between the two blocks 223, and the interior of the auxiliary box 222 between the two blocks 223 is filled with air. The width of the block 223 is greater than the width of the exhaust groove 224. The inner cavity of the auxiliary box 222 is connected to the inner cavity of the main box 201 through the connecting box 225. The input end of the air pump 220 is electrically connected to the output end of the external power supply to improve the reliability of the clamping force. Connecting boxes 225 are installed at both ends of the auxiliary box 222.

[0057] A card point auxiliary mechanism 300 is installed outside the dynamic protection mechanism 200, and the card point auxiliary mechanism 300 includes a support 301, a guide rod 302, a threaded rod 303, a bottom plate 304, a universal wheel 305, an electromagnet 306, a ball 307, a collar 308, a connecting block 309, a connector 310, a movable rod 311, a strip box 312, a limit block 313, a driven gear 314, a driving gear 315 and a toothed chain 316;

[0058] A support 301 is clamped on the outside of the main box 201, a bottom plate 304 is installed at the bottom of the support 301, a threaded rod 303 is rotatably installed on one side of the top of the bottom plate 304, and the threaded rod 303 is connected to the support 301 through a thread, a guide rod 302 is installed on the other side of the top of the bottom plate 304, and the guide rod 302 is slidably connected to the support 301, a universal wheel 305 is installed at the bottom corner of the bottom plate 304, an electromagnet 306 is embedded and installed on the edge of the side end surface of the bottom plate 304, and a plurality of balls 307 are evenly embedded and rolled at the side end surface of the bottom plate 304 located at the inner side of the electromagnet 306, and the radius of the ball 307 is greater than the thickness of the electromagnet 306;

[0059] A collar 308 is rotatably sleeved on the outer curved surface of the base 206, a connecting block 309 is rotatably installed on the middle part of the side end surface of the limit seat 205, a connector 310 is installed on the other end of the frame rod 204, and a movable rod 311 is embedded and rotatably installed on the side end surface of the connector 310, a strip box 312 is installed on one side of the main box 201 at the position corresponding to the movable rod 311, a limit block 313 is slidably installed inside the strip box 312, and the limit block 313 is fixedly connected to the movable rod 311, a driven gear 314 is installed on the middle part of the side end surface of the limit seat 205 and the base 206, a driving gear 315 is installed on the end of the movable rod 311, a tooth chain 316 is sleeved on the outside of the driving gear 315, and the driving gear 315 is connected to the driven gear 314 through the tooth chain 316.

[0060] like Figure 8 As shown, a bushing-type electronic transformer for a ring main unit includes a transformer body 100, one end of which is provided with a conical epoxy resin body 14, a plurality of secondary signal nuts 4 are evenly embedded and installed at positions of the outer curved surface of the transformer body 100 close to one side of the conical epoxy resin body 14, and a circuit board 8 is fixedly installed at the end of the secondary signal nut 4 by screws.

[0061] A current conductor 1 is inserted into the transformer body 100, a phase current coil 2 is sleeved at the outer position of the current conductor 1 inside the transformer body 100, and a zero-sequence current coil 3 is sleeved at the outer position of the current conductor 1 on one side of the phase current coil 2. The current conductor 1 is a copper conductor, and the current conductor 1 is sealed in the center of the transformer body 100. Screw holes are processed at both ends of the current conductor 1. The phase current coil 2 and the zero-sequence current coil 3 are both composed of an iron core and an enameled wire wound on the iron core. The ends of the phase current coil 2 and the zero-sequence current coil 3 are connected to the secondary signal nut 4 to detect the current and improve the convenience of signal transmission.

[0062] A through-type high-voltage capacitor 5 is sleeved on the outer side of the current conductor 1 at a position on one side of the zero-sequence current coil 3, a secondary capacitor 6 is welded on one side of the circuit board 8, and a number of error adjustment capacitors 7 are evenly welded at equal intervals in the middle of the circuit board 8. The inner electrode of the through-type high-voltage capacitor 5 is electrically connected to the current conductor 1, and the outer electrode of the through-type high-voltage capacitor 5 is connected to one electrode of the secondary capacitor 6, and the other electrode of the secondary capacitor 6 is grounded. The connecting ends of the through-type high-voltage capacitor 5 and the secondary capacitor 6 are both connected to the secondary signal nut 4, and the secondary capacitor 6 is connected in parallel with the error adjustment capacitor 7, so as to detect the voltage and accurately repair the voltage division ratio. A secondary signal line 9 is embedded and installed at the bottom of the end face of the transformer body 100, and one end of the secondary signal line 9 is electrically connected to the circuit board 8;

[0063] A voltage-equalizing network 10 is sleeved on the outside of the through-type high-voltage capacitor 5, a fixing nut 11 is installed at the position of the bolt clamp 214 on the end face of the transformer body 100, and the fixing nut 11 is welded to the voltage-equalizing network 10, and a sealing ring 12 is embedded and installed at the end face of the transformer body 100 located outside the fixing nut 11, and a temperature sensing module 13 is embedded and installed at the end of the conical epoxy resin body 14. The temperature sensing module 13 has a coil that can sense the current flowing through the current conductor 1, and the temperature sensing module 13 is tightly fitted to the current conductor 1. The temperature sensing module 13 works on the equipotential high-voltage side to detect the working temperature and improve energy saving.

[0064] Working principle and use process of the present invention: When the bushing-type electronic transformer for ring main unit and its auxiliary installation equipment are actually used, firstly, the limit seat 205 is dragged to open the distance between the limit seats 205 and the limit seats 205, so that the distance is greater than the length of the transformer body 100, and then the transformer body 100 to be installed is pushed into the extension clamp ring 2052 from one side of the extension clamp ring 2052, so that the central clamp rod 2051 is clamped into the end opening of the current conductor 1, and the transformer body 100 to be installed is fixed on the limit seat 205;

[0065] Then, the screw 217 is rotated to drive the piston ring 215 to slide and displace in the inner cavity of the base 206, and then, according to actual needs, the air inside the base 206 is pressed into the mounting seat 207 through the connecting pipe 226, or the air inside the mounting seat 207 is pumped into the base 206 through the connecting pipe 226. According to the reading of the barometer 2061, the air pressure inside the mounting seat 207 is adjusted, and the air pressure borne by the isolation ring 216 is adjusted. During the installation process of the transformer body 100, the torsional pressure borne by the external bolts is limited. Then, through the valve 2221, using external conveying equipment, a proper amount of air is injected into the auxiliary box 222 to adjust the air pressure borne by the block 223, so as to limit the pressure borne by the transformer body 100 as a whole during the installation process of the transformer body 100;

[0066] Then, the external bolt is clamped on the end of the bolt clamp 214, and the external bolt is fixed on the end of the bolt clamp 214 by the magnetic attraction of the magnetic ring 2141, and then the support 301 is moved so that the mounting seat 207 and the limit seat 205 are respectively located on both sides of the box wall of the ring network cabinet, and the box wall is the box wall of the transformer body 100 to be installed, and then the support 301 is further moved, and the magnetic attraction of the electromagnet 306 is used to make the ball 307 fit with another box wall of the ring network cabinet, and the box wall is adjacent to and perpendicular to the box wall of the transformer body 100 to be installed;

[0067] Then push the strip box 312, under the linkage action of the movable rod 311, the two rack rods 204 will drive the limit seat 205, the base 206 and the mounting seat 207 to move synchronously through the collar 308 and the connecting block 309, thereby forcing the transformer body 100 to move synchronously, and adjust the inward horizontal position of the transformer body 100, and then rotate the threaded rod 303, with the limit guide effect of the guide rod 302, to limit and adjust the horizontal height of the transformer body 100, and then perform a two-way comprehensive regulation on the relative position of the transformer body 100 and the ring network cabinet wall, so that the conical epoxy resin body 14 is aligned with the preset sleeve hole on the ring network cabinet wall, and then move the support 301 again to insert the conical epoxy resin body 14 into the preset sleeve hole on the ring network cabinet wall;

[0068] Then, the bar box 312 is rotated. Under the limiting action of the limiting block 313, the movable rod 311 will drive the driving gear 315 to rotate synchronously. With the transmission action of the toothed chain 316, the two driven gears 314 will also rotate synchronously, thereby causing the limiting seat 205, the base 206 and the mounting seat 207 to rotate synchronously. In this process, the relative position of the external bolt and the fixing nut 11 will always remain unchanged. The angle of the transformer body 100 can be adjusted according to actual needs, and the external bolts can be aligned with the preset bolt holes on the wall of the ring network cabinet.

[0069] Then the motor 208 and the air pump 220 can be started to install and fix the transformer body 100. The air pump 220 will draw external air. After being filtered by the internal medium of the filter box 2201, the external air enters the main box 201 through the air pipe 221, presses the two sliding plugs 202, and forces the two sliding plugs 202 to move toward each other. Then, under the linkage action of the pull rod 203, the frame rod 204 will drive the limit seat 205 and the machine base 206 to move toward each other, shortening the distance between the transformer body 100 and the external bolts.

[0070] Then, the external bolts and the end faces of the transformer body 100 will fit with the wall of the ring network cabinet in sequence. The order of fitting the external bolts, the end faces of the transformer body 100 and the wall of the ring network cabinet depends on the relative position of the bottom plate 304. According to the fluidity of the airflow, in this process, after one of the end of the external bolt and the end face of the transformer body 100 fits with the wall of the ring network cabinet first, the sliding plug 202 on the other side is easier to be pushed, and finally the conical epoxy resin body 14 will be completely inserted into the wall of the ring network cabinet, the sealing ring 12 will fit with the wall of the ring network cabinet, and the end of the external bolt will also abut against the fixing nut 11;

[0071] After the end of the external bolt contacts the fixing nut 11, under the driving action of the motor 208 and the transmission action of the transmission belt 211, each synchronous wheel 210 will rotate synchronously, and then with the limiting action of the threaded ring 212, under the pressure of the isolation ring 216, the hydraulic fluid inside the rotating drum 209 will press the threaded ring 212, forcing the threaded ring 212 to be unable to slide relative to the rotating drum 209 due to insufficient pressure at this time, and then the threaded ring 212 will temporarily lock the screw rod 213, so that the screw rod 213 drives the bolt clamp 214 to rotate together with the rotating drum 209, and then with the air flow pressure provided by the air pump 220, the bolt clamp 214 will drive the external bolt to be gradually screwed into the fixing nut 11, and gradually lock the transformer body 100 on the wall of the ring network cabinet;

[0072] In this process, after the external bolts are completely screwed into the fixing nuts 11, the distance between the transformer body 100 and the external bolts cannot be further shortened, that is, the sliding plug 202 can no longer slide relative to each other, and the air pressure inside the main box 201 will increase sharply. Under the conduction effect of the connecting box 225, the air flow inside the main box 201 will enter the auxiliary box 222 through the connecting box 225, forcing the blocking block 223 to withstand the same air pressure. When the air pressure is greater than the air pressure inside the auxiliary box 222, the blocking block 223 will move toward each other under the action of the air pressure inside the main box 201, and then the exhaust groove 224 will be connected, and the air flow inside the main box 201 will be discharged through the exhaust groove 224, so as to ensure that the transformer body 100 is subjected to sufficient pressing force while avoiding damage to the transformer body 100.

[0073] At the same time, after the external bolt is completely screwed into the fixing nut 11, since the external bolt can no longer rotate, and then under the limiting effect of the external bolt, the screw rod 213 can no longer rotate. At this time, under the drive of the motor 208, the rotating drum 209 will rotate relative to the screw rod 213, and then the driving force given to the threaded ring 212 by the screw rod 213 will increase, and finally the threaded ring 212 will be sufficient to overcome the pressure of the hydraulic fluid and slide relative to the rotating drum 209. Then, under the transmission effect of the hydraulic fluid, the isolation ring 216 will also overcome the internal air pressure of the mounting seat 207, driving the sliding rod 218 to slide, causing the sliding rod 218 to press the switch 219, and the switch 219 will control the external power supply to sleep, limit the maximum torsional force borne by the external bolt, avoid thread slippage, and flexibly control the torsional force to ensure the connection stability between the external bolt and the fixing nut 11;

[0074] Then, the limiting seat 205 is dragged again to open the distance between the limiting seat 205 and the limiting seat 205, so that the bolt clamp 214 is separated from the external bolt, so that the limiting seat 205 slides relative to the transformer body 100, so that the extension clamp ring 2052 is separated from the transformer body 100, and the strip box 312 is dragged to separate the limiting seat 205, the base 206 and the mounting seat 207 from the ring main unit, so that the ball 307 is separated from the ring main unit box wall, and the installation work of the current transformer body 100 is completed. Then, according to actual needs, the above steps can be repeated to install the next transformer body 100;

[0075] After the installation of each transformer body 100 is completed, the transformer body 100 can be put into use. According to actual needs, the end of the current wire 1 located on one side of the conical epoxy resin body 14 can be fixedly connected to the external elbow cable plug, and the other end of the current wire 1 can be fixedly connected to other wires in the ring network cabinet, which can form the basic structure of a complete insulating sleeve and be used as an insulating sleeve to achieve integration of the transformer and the insulating sleeve;

[0076] At this time, the phase current coil 2 and the zero-sequence current coil 3 sleeved on the outside of the current conductor 1 will sense the current on the current conductor 1 in real time and output a current signal. The secondary signal nut 4 connected to the phase current coil 2 and the zero-sequence current coil 3 serves as a current signal output terminal to form a current transformer.

[0077] By short-circuiting the jumper switch connected in series with the error adjustment capacitor 7 and cooperating with the secondary capacitor 6, the overall capacitance of the capacitor used for secondary voltage division can be fine-tuned to obtain an accurate voltage division ratio. In cooperation with the through-type high-voltage capacitor 5 sleeved on the outside of the current conductor 1, the capacitor voltage division principle can be used to form a voltage transformer to measure the voltage. The secondary signal nut 4 connected to the connecting end of the through-type high-voltage capacitor 5 and the secondary capacitor 6 is used as a voltage signal output terminal, and is further equipped with a current signal output terminal to connect the voltage signal and the current signal to the circuit board 8, and the signal is transmitted to an external measurement or protection device using the secondary signal line 9 to output the signal of the transformer;

[0078] During the normal operation of the transformer body 100, the temperature sensing module 13 located at the end of the conical epoxy resin body 14 will sense the operating temperature of the current conductor 1 in real time, and transmit the temperature data to an external measurement or protection device wirelessly at a short distance. The coil of the temperature sensing module 13 that can sense the current flowing through the current conductor 1 will provide electrical energy to the temperature sensing module 13 itself through electromagnetic conversion in real time. The function of the voltage equalizing network 10 is to make the electric field between the high-voltage device inside the transformer and the air box wall uniform, and cooperate with the sealing ring 12 to achieve sealing.

[0079] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An auxiliary installation device for a bushing-type electronic transformer for a ring main unit, comprising a main box (201), characterized in that: A dynamic protection mechanism (200) is installed outside the main box (201), and the dynamic protection mechanism (200) performs adaptive auxiliary installation on the transformer body (100); The dynamic protection mechanism (200) comprises a main box (201), a sliding plug (202), a pulling rod (203), a frame rod (204), a limiting seat (205), a machine base (206), a mounting seat (207), a motor (208), a rotating drum (209), a synchronous wheel (210), a transmission belt (211), a threaded ring (212), a screw rod (213), a bolt clamp (214), a piston ring (215), an isolation ring (216), a screw rod (217), a sliding rod (218), a switch (219), an air pump (220), an air pipe (221), an auxiliary box (222), a blocking block (223), an exhaust groove (224), a connecting box (225) and a connecting pipe (226); A main box (201) is installed on one side of the transformer body (100), a sliding plug (202) is symmetrically slidably installed inside the main box (201), a pull rod (203) is installed in the middle of the side end surface of the sliding plug (202), and the pull rod (203) is slidably connected to the main box (201), a frame rod (204) is slidably installed on the end of the pull rod (203), a limit seat (205) is rotatably installed on one end of the frame rod (204), and a base (206) is rotatably installed on the other end of the frame rod (204), A mounting seat (207) is installed in the middle of the side end surface of the machine base (206), a motor (208) is embedded and installed in the top of the side end surface of the mounting seat (207), a plurality of rotating drums (209) are installed on the edge of the side end surface of the mounting seat (207) to rotate at equal angles along the circumferential direction, a synchronous wheel (210) is installed at the end of the output shaft of the motor (208) and the end of the rotating drum (209), and the synchronous wheel (210) is rotationally connected to the mounting seat (207), and a transmission belt (211) is sleeved on the outer side of the synchronous wheel (210); A threaded ring (212) is slidably mounted inside the rotating drum (209), a screw rod (213) is threadedly mounted on the side end surface of the threaded ring (212), and the screw rod (213) is rotatably connected to the end of the rotating drum (209), a bolt clamp (214) is mounted on the end of the screw rod (213), a connecting pipe (226) is mounted on the bottom of the side end surface of the mounting seat (207), and a screw rod (217) is rotatably mounted on the top of the side end surface of the machine base (206). A piston ring (215) is slidably mounted in the inner cavity of the machine base (206), and the screw rod (217) is connected to the piston ring (215) via a thread; an isolating ring (216) is slidably mounted in the inner cavity of the mounting seat (207); a sliding rod (218) is mounted on the top of the side end surface of the isolating ring (216), and the sliding rod (218) is slidably connected to the mounting seat (207); a switch (219) is mounted at a position of the side end surface of the machine base (206) corresponding to the sliding rod (218); An air pump (220) is installed in the middle of the top of the main box (201), air pipes (221) are symmetrically installed on both sides of the top of the main box (201), a sub-box (222) is installed in the middle of the bottom of the main box (201), a block (223) is symmetrically slidably installed inside the sub-box (222), exhaust grooves (224) are symmetrically opened at the bottom of the sub-box (222), and connection boxes (225) are installed at both ends of the sub-box (222); The air outlet of the air pump (220) is connected to the inner cavity of the main box (201) via an air delivery pipe (221); a filter box (2201) is installed at the air inlet of the air pump (220); a valve (2221) is embedded and installed at a position between two blocking blocks (223) in the middle of the side end surface of the auxiliary box (222); the interior of the auxiliary box (222) is filled with air at a position between the two blocking blocks (223); the width of the blocking blocks (223) is greater than the width of the exhaust grooves (224); the inner cavity of the auxiliary box (222) is connected to the inner cavity of the main box (201) via a connecting box (225); and the input end of the air pump (220) is electrically connected to the output end of an external power supply.

2. The auxiliary installation device of bushing type electronic mutual inductor for ring main unit according to claim 1, characterized in that: The pull rod (203) comprises a long rod (2031) and a short rod (2032); the long rod (2031) is located on one side of the limit seat (205), and the short rod (2032) is located on one side of the machine base (206); the length of the long rod (2031) is greater than the length of the transformer body (100); the difference between the length of the long rod (2031) and the length of the main box (201) is less than the length of the transformer body (100); and the length of the short rod (2032) is less than the length of the transformer body (100).

3. The auxiliary installation device of bushing type electronic mutual inductor for ring main unit according to claim 1, characterized in that: A central clamping rod (2051) is installed in the middle of the side end surface of the limiting seat (205), and an extended clamping ring (2052) is installed at the bottom of the side end surface of the limiting seat (205); the limiting seat (205), the central clamping rod (2051) and the extended clamping ring (2052) are all matched with the transformer body (100).

4. The auxiliary installation device of bushing type electronic mutual inductor for ring main unit according to claim 1, characterized in that: A pressure gauge (2061) is embedded and installed at the top edge of the machine base (206); the inner cavity of the machine base (206) is connected to the inner cavity of the mounting seat (207) through a connecting pipe (226); the inner cavities of the connecting pipe (226) and the mounting seat (207) are filled with air at a position between the piston ring (215) and the isolation ring (216); the synchronous wheel (210) is a hollow wheel; the inner cavity of the mounting seat (207) is connected to the inner cavity of the rotating drum (209) through the synchronous wheel (210); the inner cavity of the mounting seat (207) is filled with hydraulic fluid at a position between the isolation ring (216) and the threaded ring (212); a magnetic attraction ring (2141) is embedded and installed at the side end surface edge of the bolt clamp (214); the switch (219) is an external power sleep switch; the input ends of the motor (208) and the switch (219) are both electrically connected to the output end of the external power supply.

5. The auxiliary installation device of bushing type electronic mutual inductor for ring main unit according to claim 1, characterized in that: A card point auxiliary mechanism (300) is installed outside the dynamic protection mechanism (200), and the card point auxiliary mechanism (300) comprises a support (301), a guide rod (302), a threaded rod (303), a bottom plate (304), a universal wheel (305), an electromagnet (306), a ball (307), a collar (308), a connecting block (309), a connector (310), a movable rod (311), a strip box (312), a limit block (313), a driven gear (314), a driving gear (315), and a toothed chain (316); A support (301) is clamped on the outside of the main box (201), a bottom plate (304) is installed at the bottom of the support (301), a threaded rod (303) is rotatably installed on one side of the top of the bottom plate (304), and the threaded rod (303) is connected to the support (301) through a thread, a guide rod (302) is installed on the other side of the top of the bottom plate (304), and the guide rod (302) is slidably connected to the support (301), a universal wheel (305) is installed at the corner of the bottom end of the bottom plate (304), an electromagnet (306) is embedded and installed at the edge of the side end surface of the bottom plate (304), and a plurality of balls (307) are evenly and equidistantly embedded and rollingly installed at the side end surface of the bottom plate (304) located at the inner side of the electromagnet (306), and the radius of the balls (307) is greater than the thickness of the electromagnet (306); The outer curved surface of the machine base (206) is rotatably sleeved with a collar (308); a connecting block (309) is rotatably mounted on the middle of the side end surface of the limit seat (205); a connector (310) is mounted on the other end of the frame rod (204); a movable rod (311) is rotatably mounted on the side end surface of the connector (310); a strip box (312) is mounted on one side of the main box (201) at a position corresponding to the movable rod (311); and the strip box (312) has an inner portion. A limit block (313) is slidably installed, and the limit block (313) is fixedly connected to the movable rod (311); a driven gear (314) is installed at the middle of the side end surfaces of the limit seat (205) and the machine base (206); a driving gear (315) is installed at the end of the movable rod (311); a toothed chain (316) is sleeved on the outer side of the driving gear (315), and the driving gear (315) is connected to the driven gear (314) via the toothed chain (316).

6. A bushing-type electronic transformer for a ring main unit, comprising a transformer body (100), characterized in that: The auxiliary installation device for a bushing-type electronic transformer for a ring main unit according to any one of claims 1 to 5 is used for auxiliary installation, wherein a conical epoxy resin body (14) is provided at one end of the transformer body (100), and a plurality of secondary signal nuts (4) are evenly embedded and installed at positions on the outer curved surface of the transformer body (100) close to one side of the conical epoxy resin body (14), and a circuit board (8) is fixedly installed at the end of the secondary signal nut (4) by means of screws. A current conductor (1) is inserted into the transformer body (100), a phase current coil (2) is sleeved at a position outside the current conductor (1) inside the transformer body (100), a zero-sequence current coil (3) is sleeved at a position outside the current conductor (1) on one side of the phase current coil (2), a through-type high-voltage capacitor (5) is sleeved at a position outside the current conductor (1) on one side of the zero-sequence current coil (3), a secondary capacitor (6) is welded to one side of the circuit board (8), a plurality of error adjustment capacitors (7) are welded to the middle of the circuit board (8) at equal intervals, and a secondary signal line (9) is embedded and installed at the bottom of the end surface of the transformer body (100), and one end of the secondary signal line (9) is electrically connected to the circuit board (8); A voltage balancing net (10) is sleeved on the outside of the through-type high-voltage capacitor (5); a fixing nut (11) is installed at a position corresponding to the bolt clamp (214) on the end surface of the transformer body (100), and the fixing nut (11) is welded to the voltage balancing net (10); a sealing ring (12) is embedded and installed at a position outside the fixing nut (11) on the end surface of the transformer body (100); and a temperature sensor module (13) is embedded and installed at the end of the conical epoxy resin body (14).

7. The bushing-type electronic mutual inductor for a ring main unit according to claim 6, characterized in that: The current conductor (1) is a copper conductor. The current conductor (1) is sealed in the center of the transformer body (100). Screw holes are processed at both ends of the current conductor (1). The phase current coil (2) and the zero-sequence current coil (3) are both composed of an iron core and an enameled wire wound on the iron core. The ends of the phase current coil (2) and the zero-sequence current coil (3) are both connected to a secondary signal nut (4).

8. The bushing-type electronic transformer for a ring main unit according to claim 6, characterized in that: The inner electrode of the through-type high-voltage capacitor (5) is electrically connected to the current conductor (1), the outer electrode of the through-type high-voltage capacitor (5) is connected to an electrode of the secondary capacitor (6), the other electrode of the secondary capacitor (6) is grounded, the connection ends of the through-type high-voltage capacitor (5) and the secondary capacitor (6) are both connected to the secondary signal nut (4), and the secondary capacitor (6) is connected in parallel with the error adjustment capacitor (7).

9. The bushing-type electronic mutual inductor for a ring main unit according to claim 6, characterized in that: The temperature sensing module (13) has a coil capable of sensing the current flowing through the current conductor (1); the temperature sensing module (13) is tightly fitted to the current conductor (1); and the temperature sensing module (13) operates on the equipotential high voltage side.

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