CN101964245A - Underground totally-sealed combined transformer with lighting protection, overvoltage protection and overcurrent protection - Google Patents
Underground totally-sealed combined transformer with lighting protection, overvoltage protection and overcurrent protection Download PDFInfo
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- CN101964245A CN101964245A CN2009100553920A CN200910055392A CN101964245A CN 101964245 A CN101964245 A CN 101964245A CN 2009100553920 A CN2009100553920 A CN 2009100553920A CN 200910055392 A CN200910055392 A CN 200910055392A CN 101964245 A CN101964245 A CN 101964245A
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Abstract
The invention relates to an underground totally-sealed combined transformer with lighting protection, overvoltage protection and overcurrent protection, which comprises an outer case, an iron core, a three-phase high-voltage winding, a three-phase four-wire low-voltage winding, a high-voltage plugging type cable connector and a low-voltage plugging type cable connector, wherein the output terminals of the three phases in the low-voltage winding are all connected with low-voltage lightning arresters and low-voltage circuit breakers, and high-voltage fusers are connected in series between the output terminals of the high-voltage winding and the high-voltage cable connector. The low-voltage lightning arresters, the low-voltage circuit breakers and the high-voltage fusers are all fixedly arranged on the outer case with sealed chambers. One high-voltage fuser is respectively arranged in each of the three independent sealed chambers, and the low-voltage circuit breakers are molded case air circuit breakers. The low-voltage lightning arresters and the low-voltage circuit breakers on the low voltage side and the high-voltage fusers on the high voltage side can be used for effectively inhibiting overvoltage and overcurrent of the totally-sealed combined transformer, so that the operational reliability is increased.
Description
Technical field:
The present invention relates to electricity field, relate in particular to the power transmission and distribution technology, particularly underground distribution transformer, concrete is the hermetically sealed combined transformer of underground type of a kind of lightning protection, anti-overvoltage, overcurrent.
Background technology:
Transformer is widely used in industry and life power supply.Take up an area of in order to save to install, the available technology adopting underground transformer, transformer has all-sealed structure, to realize waterproof requirement.The applicant once proposed the utility application that notification number is CN2711869, a kind of hermetically sealed underground transformer is disclosed, this transformer is made of shell and core body, core body is by iron core, coil, insulator constitutes, shell is made of metal shell sealing gasket and lid, lid is provided with pressure releaser made, high, the low-voltage cable connector, high-tension fuse, shunting switch, high, the low-voltage cable connector adopts hermetically sealed plug-in cable connector, high-voltage cable connector one end connects high-tension fuse, the fuse other end is connected with high-tension coil, the tap of high-tension coil is connected with shunting switch, is filled with transformer oil in the shell.Fuse can in time disconnect high voltage source and extinguish arcs when running into fault, guarantees the transformer safe operation.Transformer damages and is mainly caused by overvoltage and overcurrent; overvoltage can be by the switching manipulation overvoltage; lightning overvoltage; and fault overvoltage causes; transformer is as only adopting lightning protection in the high-pressure side; to just suppressing; the inverse transformation overvoltage all is useless; transformer overvoltage damage accident still can take place; simultaneously; when dry weather; soil resistivity is higher; earth resistance is bigger; overvoltage is higher, and underground transformer of the prior art is all less than in low-pressure side lightning arrester being set; low pressure broken circuit protecting equipment and high-tension fuse protective device, so transformer is struck by lightning easily; perhaps overvoltage; the perhaps damage of overcurrent.On the other hand, when overvoltage when ground connection or phase fault take place in low-pressure side, circuit, the short circuit current that generation is higher than 25 times of rated current, the high-pressure side produces the demagnetizing action that big electric current is offset the low-pressure side short circuit current, big electric current produces very big mechanical stress in winding, winding deformation is damaged, cause transformer fault.
Summary of the invention:
The hermetically sealed combined transformer of underground type that the purpose of this invention is to provide a kind of lightning protection, anti-overvoltage, overcurrent, the hermetically sealed combined transformer of underground type of described this lightning protection, anti-overvoltage, overcurrent will solve in the prior art underground distribution transformer when antecedent soil moisture, soil resistivity is higher, is subjected to the technical problem of the damage of overvoltage or overcurrent easily.
This lightning protection of the present invention, anti-overvoltage, the hermetically sealed combined transformer of the underground type of overcurrent is by shell, unshakable in one's determination, the three-phase high-voltage winding, three-phase and four-line low pressure winding, high-voltage cable connector and low-voltage cable connector constitute, described high-voltage cable connector and low-voltage cable connector are arranged on the shell, described three-phase high-voltage winding, three-phase and four-line low pressure winding and unshakable in one's determination the setting in the enclosure, three-phase high-voltage winding and three-phase and four-line low pressure winding are arranged on the iron core, outlet in the three-phase high-voltage winding all connects a high-voltage cable connector separately, outlet in the three-phase and four-line low pressure winding all connects a low-voltage cable connector separately, be filled with the transformer oil of insulating heat-conductive in the shell, wherein, all be connected in series with low-voltage circuit breaker between outlet in the described three-phase and four-line low pressure winding and the low-voltage cable connector, outlet in the three-phase and four-line low pressure winding is connected back ground connection respectively with a low voltage surge arrester, all be connected in series with high-tension fuse between outlet in the described three-phase high-voltage winding and the high-voltage cable connector.
Further, any one described low voltage surge arrester, low-voltage circuit breaker and high-tension fuse all are fixedly installed in the closed chamber on the shell.
Further, be provided with three closed chambers in the described shell, be provided with a described high-tension fuse in any one described closed chamber.
Further, be connected by the plug-in structure between described high-tension fuse and the closed chamber.
Further, described low-voltage circuit breaker is to mould the shell air circuit.
Further, described high-voltage connection terminal and low-voltage wiring terminal are the waterproof umbilical connector.
Operation principle of the present invention is: low voltage surge arrester provides lightning protection for the low-pressure side of transformer, and low-voltage circuit breaker provides overcurrent protection for the low-pressure side of transformer, and high-tension fuse provides overcurrent protection for the high-pressure side of transformer.
The present invention compared with prior art, its effect is actively and significantly.The present invention is provided with low voltage surge arrester and low-voltage circuit breaker in the low-pressure side of the hermetically sealed combined transformer of underground type; for the low-pressure side of transformer provides lightning protection, overvoltage and overcurrent protection; be provided with high-tension fuse in the high-pressure side, for the high-pressure side of transformer provides overcurrent protection.The present invention can effectively suppress the overvoltage and the overcurrent of the hermetically sealed combined transformer of underground type, has improved operational reliability, and can reach the degree of protection requirement of IP68.
Description of drawings
Fig. 1 is the structural representation of the hermetically sealed combined transformer of underground type of lightning protection of the present invention, anti-overvoltage, overcurrent.
Embodiment
As shown in Figure 1, lightning protection of the present invention, anti-overvoltage, the hermetically sealed combined transformer of the underground type of overcurrent is by shell 1, (not shown) unshakable in one's determination, three-phase high-voltage winding (not shown), three-phase and four-line low pressure winding (not shown), high pressure plug-in cable connector and low pressure plug-in cable connector 3 are combined into, described high-voltage cable connector 2 and low-voltage cable connector 3 are arranged on the shell 1, described three-phase high-voltage winding, three-phase and four-line low pressure winding and iron core are arranged in the shell 1, three-phase high-voltage winding and three-phase and four-line low pressure winding are arranged on the iron core, high-voltage cable connector 2 is connected with the three-phase high-voltage winding, low-voltage cable connector 3 is connected with three-phase and four-line low pressure winding, be filled with the transformer oil of insulating heat-conductive in the shell 1, wherein, the described three-phase and four-line low pressure winding outlet low-voltage circuit breaker (not shown) that all is connected in series, and, all be connected in series with the high-tension fuse (not shown) between outlet in the described three-phase high-voltage winding and the high-voltage cable connector through low voltage surge arrester (not shown) ground connection.
Further, any one described low voltage surge arrester, low-voltage circuit breaker and high-tension fuse all are fixedly installed in the closed chamber on the shell.
Further, be provided with three independently closed chambers in the described shell, be provided with a described high-tension fuse in any one described closed chamber.
Further, described high-tension fuse connects by the plug-in structure between closed chamber.
Further, described low-voltage circuit breaker is to mould the shell air circuit.
Further, described high-voltage cable connector 2 and low-voltage cable connector 3 are the waterproof umbilical connector.
Claims (6)
1. lightning protection, anti-overvoltage, the hermetically sealed combined transformer of the underground type of overcurrent, by shell, unshakable in one's determination, the three-phase high-voltage winding, three-phase and four-line low pressure winding, high pressure plug-in cable connector and low pressure plug-in cable connector, described high-voltage cable connector and low-voltage cable connector are arranged on the shell, described three-phase high-voltage winding, three-phase and four-line low pressure winding and unshakable in one's determination the setting in the enclosure, three-phase high-voltage winding and three-phase and four-line low pressure winding are arranged on the iron core, outlet in the three-phase high-voltage winding all connects a high-voltage cable connector separately, outlet in the three-phase and four-line low pressure winding all connects a low-voltage cable connector separately, be filled with the insulating heat-conductive transformer oil in the shell, it is characterized in that: all be connected in series with low-voltage circuit breaker between outlet in the described three-phase and four-line low pressure winding and the low-voltage cable connector, outlet in the three-phase and four-line low pressure winding is connected back ground connection respectively with a low voltage surge arrester, all be connected in series with high-tension fuse between outlet in the described three-phase high-voltage winding and the high-voltage cable connector.
2. the hermetically sealed combined transformer of underground type of lightning protection as claimed in claim 1, anti-overvoltage, overcurrent is characterized in that: any one described low voltage surge arrester, low-voltage circuit breaker and high-tension fuse all are fixedly installed in the closed chamber on the shell.
3. the hermetically sealed combined transformer of underground type of lightning protection as claimed in claim 1, anti-overvoltage, overcurrent, it is characterized in that: be provided with three independent sealed chambers in the described shell, be provided with a described high-tension fuse in any one described closed chamber.
4. the hermetically sealed combined transformer of underground type of lightning protection as claimed in claim 3, anti-overvoltage, overcurrent is characterized in that: be connected by the plug-in cable connector between described high-tension fuse and the closed chamber.
5. the hermetically sealed combined transformer of underground type of lightning protection as claimed in claim 1, anti-overvoltage, overcurrent is characterized in that: described low-voltage circuit breaker is to mould the shell air circuit.
6. the hermetically sealed combined transformer of underground type of lightning protection as claimed in claim 1, anti-overvoltage, overcurrent is characterized in that: described high-voltage cable connector and low-voltage cable connector are waterproof plug-in cable connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100553920A CN101964245A (en) | 2009-07-24 | 2009-07-24 | Underground totally-sealed combined transformer with lighting protection, overvoltage protection and overcurrent protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100553920A CN101964245A (en) | 2009-07-24 | 2009-07-24 | Underground totally-sealed combined transformer with lighting protection, overvoltage protection and overcurrent protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101964245A true CN101964245A (en) | 2011-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100553920A Pending CN101964245A (en) | 2009-07-24 | 2009-07-24 | Underground totally-sealed combined transformer with lighting protection, overvoltage protection and overcurrent protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101964245A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882132A (en) * | 2012-10-14 | 2013-01-16 | 江苏中压电气工程有限公司 | Integrated fully-sealed component of medium voltage electric cable connector and medium voltage fuser |
| CN103413656A (en) * | 2013-08-13 | 2013-11-27 | 上海瑞奇电气设备有限公司 | Underground transformer used in high altitude area |
| CN110082615A (en) * | 2018-01-26 | 2019-08-02 | 上海瑞奇电气设备股份有限公司 | Covered transformer temperature-raising experimental method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2591738Y (en) * | 2002-12-13 | 2003-12-10 | 上海置信电气股份有限公司 | Whole-self-protection three phase dry type distributing transformer |
| CN2711869Y (en) * | 2004-05-08 | 2005-07-20 | 上海瑞奇电气设备有限公司 | All closed buried type transformer |
| CN2852483Y (en) * | 2005-08-25 | 2006-12-27 | 宋益平 | Distribution transformer and lightning protection apparatus of low-voltage power station |
| CN201075367Y (en) * | 2007-08-30 | 2008-06-18 | 谭迪 | High voltage fuse for ground-embedded type voltage transformer |
| CN201465762U (en) * | 2009-07-24 | 2010-05-12 | 上海瑞奇电气设备有限公司 | Lightning, over-voltage and over-current prevention underground omni-sealed combined transformer |
-
2009
- 2009-07-24 CN CN2009100553920A patent/CN101964245A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2591738Y (en) * | 2002-12-13 | 2003-12-10 | 上海置信电气股份有限公司 | Whole-self-protection three phase dry type distributing transformer |
| CN2711869Y (en) * | 2004-05-08 | 2005-07-20 | 上海瑞奇电气设备有限公司 | All closed buried type transformer |
| CN2852483Y (en) * | 2005-08-25 | 2006-12-27 | 宋益平 | Distribution transformer and lightning protection apparatus of low-voltage power station |
| CN201075367Y (en) * | 2007-08-30 | 2008-06-18 | 谭迪 | High voltage fuse for ground-embedded type voltage transformer |
| CN201465762U (en) * | 2009-07-24 | 2010-05-12 | 上海瑞奇电气设备有限公司 | Lightning, over-voltage and over-current prevention underground omni-sealed combined transformer |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102882132A (en) * | 2012-10-14 | 2013-01-16 | 江苏中压电气工程有限公司 | Integrated fully-sealed component of medium voltage electric cable connector and medium voltage fuser |
| CN102882132B (en) * | 2012-10-14 | 2015-03-25 | 江苏中压电气工程有限公司 | Integrated fully-sealed component of medium voltage electric cable connector and medium voltage fuser |
| CN103413656A (en) * | 2013-08-13 | 2013-11-27 | 上海瑞奇电气设备有限公司 | Underground transformer used in high altitude area |
| CN110082615A (en) * | 2018-01-26 | 2019-08-02 | 上海瑞奇电气设备股份有限公司 | Covered transformer temperature-raising experimental method |
| CN110082615B (en) * | 2018-01-26 | 2021-08-24 | 上海瑞奇电气设备股份有限公司 | Temperature rise test method for buried transformer |
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Application publication date: 20110202 |