High-voltage combined electrical apparatus Technical field

The present invention relates to a high-voltage combined electrical apparatus, in particular a combined electrical apparatus having a high-voltage switch and a transformer.

Background art

In electric power systems, especially high-voltage transformer substations, high-voltage switches and transformers connected by overhead lines are often used. This design requires a large amount of space, and there is the possibility of an accidental short circuit occurring between an overhead line and the ground, for example a short circuit caused by lightning. In this process, a high-voltage switch will be unable to protect a transformer, so that the transformer suffers damage. Moreover, once installed, high-voltage switches (e.g. ceramic column circuit breakers) and transformers occupy a large area of ground. With land resources becoming ever scarcer and more expensive, and requirements on the reliability of electric power systems becoming ever more exacting, this design needs to be improved.

Content of the invention

The object of the invention is to provide a high-voltage combined electrical apparatus. This high-voltage combined electrical apparatus comprises a transformer, at least one circuit breaker, at least one oil/gas separation module and at least one operating mechanism, wherein the circuit breaker comprises a ceramic insulator, an upper outgoing line seat, a lower outgoing line seat, and a disconnecting mechanism connected between the upper outgoing line seat and the lower outgoing line seat. The oil/gas separation module has a first end electrically connected to a transformer coil of the transformer, and a second end electrically connected to the lower outgoing line seat. The operating mechanism is connected to and controls the disconnecting mechanism. The high-voltage combined electrical apparatus of the present invention integrates a ceramic column circuit breaker and a transformer, omitting the conventional transformer oil/gas sleeve and overhead line, so that the overall structure thereof is simpler, the cost is lower, the area of ground occupied by the equipment is reduced, and the occurrence of short circuits associated with overhead lines is avoided.

According to one aspect of the present invention, the circuit breaker is disposed at the top of the transformer, while the first end of the oil/gas separation module is electrically connected to the transformer coil by means of a lead wire. Having the circuit breaker positioned at the top of the transformer helps to further reduce the area of ground occupied by the high-voltage combined electrical apparatus.

According to another aspect of the present invention, the high- voltage combined electrical apparatus has three said circuit breakers, three said oil/gas separation modules and one said operating mechanism. The use of one operating mechanism to simultaneously operate three circuit breakers helps to ensure synchrony of operation among the three circuit breakers.

According to another aspect of the present invention, the high- voltage combined electrical apparatus also comprises a connecting rod compartment fixed to a transformer housing, the lower outgoing line seats of the three circuit breakers are connected individually to the top of the connecting rod compartment, while the second ends of the three oil/gas separation modules are connected individually to the bottom of the connecting rod compartment. The connecting rod compartment can achieve synchronous operation of the three circuit breakers .

According to another aspect of the present invention, the circuit breaker is disposed at a side of the transformer. Having the circuit breaker positioned at a side of the transformer helps to reduce the height of the transformer.

According to another aspect of the present invention, the high- voltage combined electrical apparatus comprises three said circuit breakers and three said oil/gas separation modules. The first end of each of the oil/gas separation modules is connected mechanically to a housing of the transformer, and the second end thereof is connected mechanically to the lower outgoing line seat; the oil/gas separation module also comprises a third end, and a pull rod passes through the second end, the third end and the lower outgoing line seat, and connects the disconnecting mechanism and the operating mechanism. The oil/gas separation modules can ensure the separation of insulating oil in the transformer from insulating gas in the circuit breaker, while allowing the mechanical operation of the circuit breaker by the operating mechanism.

According to another aspect of the present invention, the high- voltage combined electrical apparatus comprises a support platform fixed to a side of the transformer housing, and the third end of each of the oil/gas separation modules is fixed mechanically to the support platform. The support platform helps to increase the strength of that part of the high-voltage combined electrical apparatus which supports the circuit breaker .

According to another aspect of the present invention, the high- voltage combined electrical apparatus comprises three said operating mechanisms, each pull rod individually connecting one said disconnecting mechanism and one said operating mechanism. By using three operating mechanisms to operate the circuit breakers individually, a connecting rod mechanism between circuit breakers can be omitted, so that the structure is simpler .

According to another aspect of the present invention, the high- voltage combined electrical apparatus has just one operating mechanism, and also comprises a connecting rod mechanism connected to the single operating mechanism. The use of one operating mechanism to simultaneously operate three circuit breakers helps to ensure synchrony of operation among the three circuit breakers, and also saves costs.

According to another aspect of the present invention, the oil/gas separation module comprises an oil/gas separation module housing and an insulating support base. The lower outgoing line seat passes through a second end of the oil/gas separation module and is connected to the transformer via an insulator. An upper part of a pull rod passes through the lower outgoing line seat and is connected to the disconnecting mechanism, while a lower part of the pull rod passes through the insulating support base and is connected to the operating mechanism, and maintains gas-tightness by means of a seal. The oil/gas separation module can achieve separation of oil and gas very well .

The explanation above is merely an overview of the technical solution of the present invention. To enable the technical means of the present invention to be understood more clearly and be implemented in accordance with the content of the description, and to make the abovementioned and other objects, features and advantages of the present invention more obvious and easier to understand, a detailed explanation is given below by means of preferred embodiments, in conjunction with the accompanying drawings .

Description of the accompanying drawings Preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings, to give those skilled in the art a clearer understanding of the abovementioned and other features and advantages of the present invention. Drawings:

Fig. 1 shows a schematic diagram of a high-voltage combined electrical apparatus according to an embodiment of the present invention ;

Fig. 2 shows schematically a perspective drawing of a high- voltage combined electrical apparatus according to another embodiment of the present invention;

Fig. 3 shows schematically a local sectional view of the high- voltage combined electrical apparatus in Fig. 2 ;

Fig. 4 shows schematically a magnified drawing of part A in Fig. 3.

The labels used in the drawings are as follows:

Particular embodiments The present invention is explained in further detail below by way of embodiments, to clarify the object, technical solution and advantages thereof.

Fig. 1 shows schematically a high-voltage combined electrical apparatus according to an embodiment of the present invention. This high-voltage combined electrical apparatus has a transformer 3, three circuit breakers 1, three oil/gas separation modules 2 and one operating mechanism 6. Those skilled in the art will understand that since the number of circuit breakers, oil/gas separation modules and operating mechanisms may be selected according to actual requirements, the high-voltage combined electrical apparatus comprises at least one circuit breaker, at least one oil/gas separation module and at least one operating mechanism. Each circuit breaker 1 may, as shown in Fig. 2, comprise a ceramic insulator 11, an upper outgoing line seat 111, a lower outgoing line seat 112, and a disconnecting mechanism (not shown) connected between the upper outgoing line seat 111 and the lower outgoing line seat 112. Each oil/gas separation module 2 has a first end electrically connected to a transformer coil 4 of the transformer 3, and a second end electrically connected to the lower outgoing line seat 112. The operating mechanism 6 is connected to and controls the disconnecting mechanism. Each circuit breaker 1 is disposed at the top of the transformer 3, while the first end of each oil/gas separation module 2 is electrically connected to the transformer coil 4 by means of a lead wire 7. The high-voltage combined electrical apparatus of the present invention integrates a ceramic column circuit breaker and a transformer, omitting the conventional transformer oil/gas sleeve and overhead line, so that the overall structure thereof is simpler, the cost is lower, the area of ground occupied by the equipment is reduced, and the occurrence of short circuits associated with overhead lines is avoided . The high-voltage combined electrical apparatus also comprises a connecting rod compartment 8 fixed to a transformer housing 31. The lower outgoing line seats 112 of the three circuit breakers 1 are connected individually to the top of the connecting rod compartment 8, while the second ends of the three oil/gas separation modules 2 are connected individually to the bottom of the connecting rod compartment 8. Those skilled in the art will understand that the connecting rod compartment 8 is by no means necessary, but can achieve synchronous operation of the three circuit breakers. In another embodiment of the present invention which is not shown, the high-voltage combined electrical apparatus in Fig. 1 may also comprise three circuit breakers, three oil/gas separation modules and three operating mechanisms. In this case, each operating mechanism independently controls one circuit breaker. Having the circuit breakers positioned at the top of the transformer helps to further reduce the area of ground occupied by the high-voltage combined electrical apparatus, while the use of one operating mechanism to simultaneously operate three circuit breakers helps to ensure synchrony of operation among the three circuit breakers .

Figs. 2, 3 and 4 show schematically perspective drawings of a high-voltage combined electrical apparatus according to another embodiment of the present invention, wherein circuit breakers 1 are disposed at a side of a transformer 3. The high-voltage combined electrical apparatus comprises three circuit breakers 1 and three oil/gas separation modules 2. Each oil/gas separation module 2 has a first end connected mechanically to a housing 31 of the transformer 3, and a second end connected mechanically to a lower outgoing line seat 112. The oil/gas separation module 2 also comprises a third end, wherein a pull rod 61 passes through the second end, third end and lower outgoing line seat 112, and connects a disconnecting mechanism and an operating mechanism 6. In the case where the strength of the connection between the transformer housing and the oil/gas separation module is inadequate, the high-voltage combined electrical apparatus may also comprise a support platform 32. The support platform 32 is fixed (preferably by welding) to a side of the transformer housing 31, and the third end of each oil/gas separation module 2 is fixed mechanically to the support platform 32. The oil/gas separation modules can ensure the separation of insulating oil in the transformer from insulating gas in the circuit breaker, while allowing the mechanical operation of the circuit breaker by the operating mechanism. The high-voltage combined electrical apparatus shown in Fig. 2 comprises three operating mechanisms 6, each pull rod 61 individually connecting one disconnecting mechanism and one operating mechanism 6. By using three operating mechanisms to operate the circuit breakers individually, a connecting rod mechanism between circuit breakers can be omitted, so that the structure is simpler. Those skilled in the art will understand that the high-voltage combined electrical apparatus may also have just one operating mechanism 6, and also comprise a connecting rod mechanism connected to the operating mechanism 6. It will then be possible to control multiple circuit breakers simultaneously using one operating mechanism. The use of one operating mechanism to simultaneously operate three circuit breakers helps to ensure synchrony of operation among the three circuit breakers, and also saves costs.

Fig. 4 shows schematically a magnified drawing of part A in Fig. 3. The oil/gas separation module 2 comprises an oil/gas separation module housing 21 and an insulating support base 22. The lower outgoing line seat 112 passes through the second end of the oil/gas separation module 2 and is connected to the transformer 3 via an insulator 23. An upper part of a pull rod 61 passes through the lower outgoing line seat 112 and is connected to the disconnecting mechanism, while a lower part of the pull rod 61 passes through the insulating support base 22 and is connected to the operating mechanism 6, and maintains gas-tightness by means of a seal 24. The oil/gas separation module housing 21 of the oil/gas separation module 2 is made of metal, while the lower outgoing line seat 112 installed therein is made of an electrically conductive material. The upper part of the pull rod 61 is made of an insulating material, passes through the lower outgoing line seat 112 and is connected to the disconnecting mechanism. The lower outgoing line seat 112 passes through the second end of the oil/gas separation module 2, and the pull rod 61 maintains the gas-tightness of the oil/gas separation module 2 by means of the seal 24. The lower outgoing line seat 112 is connected to the transformer 3 by means of insulator 23. Insulator 23 is at the same time used to achieve separation of oil and gas, and maintains the gas- tightness of the oil/gas separation module 2.

The internal structure of the transformer of the present invention is the same as that of a conventional transformer. Changing the installation position of the original outlet sleeve enables it to be adapted to the installation of post terminals of a ceramic column circuit breaker, and enhances mechanical strength. The principle of the circuit breaker of the present invention is the same as that of a conventional ceramic column circuit breaker. Connection to an arc- extinguishing chamber is achieved by moving the original operating lever to the outside, and by designing, inside the ceramic insulator, a conductor connected to the oil/gas separation module. Since it is necessary to move the operating lever to the outside, the direction-changing part of the transmission chain must be designed to be between two ceramic insulators. Therefore the part between the two ceramic insulators requires a sealing housing.

The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit it. Any amendments, equivalent substitutions or improvements etc. made within the spirit and principles of the present invention shall be included in the scope of protection thereof.