CN115832920B - Totally-enclosed insulating transformer substation - Google Patents
Totally-enclosed insulating transformer substation Download PDFInfo
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- CN115832920B CN115832920B CN202310023447.XA CN202310023447A CN115832920B CN 115832920 B CN115832920 B CN 115832920B CN 202310023447 A CN202310023447 A CN 202310023447A CN 115832920 B CN115832920 B CN 115832920B
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Abstract
The invention relates to the technical field of transformer substations, in particular to a totally-enclosed insulating transformer substation, which comprises GIS switch equipment, a power transformer, a neutral point complete device and a GIL power transmission line, wherein a metal cylinder is arranged on the outer side of the power transformer, an oil-gas isolation device is arranged at an interface of the power transformer, an insulating medium is arranged in the metal cylinder, and a management and control assembly is arranged on one side of the metal cylinder; the control assembly comprises an air pump, an air storage tank and a recovery treatment tank, an air inlet pipe is arranged between the air pump and the metal cylinder, an exhaust pipe is arranged between the recovery treatment tank and the metal cylinder, a control valve is arranged on the exhaust pipe, and a filter is arranged on one side of the air storage tank. According to the invention, the sulfur hexafluoride gas is recovered and treated by the management and control component, impurities in the gas are filtered and recovered, so that the gas is ensured to have a sufficient insulating effect, and the influence on the insulating protection work of the transformer after the sulfur hexafluoride is decomposed is avoided.
Description
Technical Field
The invention relates to the technical field of transformer substations, in particular to a fully-closed insulating transformer substation.
Background
The conventional transformer substation design outgoing line mode is basically that high voltage is connected with an overhead incoming line, a neutral point is directly grounded or connected with a neutral point complete device, and low voltage is connected with a copper bus. This approach requires a large insulation distance, resulting in a large overall dimension of the substation. Meanwhile, the conductors and the connectors are exposed to the air, so that the conductors and the connectors are greatly influenced by the natural environment. The interfaces of the conventional transformer and other equipment are all in the form of oil-gas sleeves, the sleeves are frequently required to be hoisted on a construction site, the process is also easily affected by natural environment, and the requirements on environmental humidity are high.
The transformer and the components thereof are connected in the metal enclosed space and are not exposed in the air, and sulfur hexafluoride gas is filled in the metal enclosed space to serve as an insulating medium, but the danger of suffocating people occurs due to the excessive concentration of the sulfur hexafluoride gas (SF 6), and the situation is considered when designing the indoor ventilation device of the transformer substation. SF6 gas can be mixed with air by convection but at a slow rate. Once mixed, the gases form a mixed gas of SF6 and air, which is not separated again. The problem is serious that the decomposition products of SF6 such as SF4, S2F2, SF2, SOF2, SO2F2, SOF4 and HF, etc. under the action of electric arc are all strongly corrosive and toxic.
In the prior art, if the transformer substation equipment lacks a device for supplementing and recycling sulfur hexafluoride gas, if gaps appear in a metal closed space, sulfur hexafluoride gas is leaked, or toxic and harmful gas decomposed from the sulfur hexafluoride gas is increased, operators cannot find and maintain in time, accidents are easily caused, the transformer substation equipment is damaged, and power transmission is affected.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a fully-closed insulating transformer substation.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a totally closed insulation substation, includes GIS switchgear, power transformer, neutral point integrated equipment, GIL transmission line, the power transformer outside is equipped with the metal cylinder, power transformer interface department is equipped with oil gas isolating device, be equipped with insulating medium in the metal cylinder, metal cylinder one side is equipped with the management and control subassembly, the management and control subassembly is used for detecting insulating medium flow and composition to in time retrieve or supply insulating medium;
the control assembly comprises an air pump, an air storage tank and a recovery processing tank, an air inlet pipe is arranged between the air pump and the metal cylinder, an exhaust pipe is arranged between the recovery processing tank and the metal cylinder, a control valve is arranged on the exhaust pipe, a filter is arranged on one side of the air storage tank, and a circulation valve is arranged between the recovery processing tank and the air storage tank;
the gas storage tank is used for storing and precipitating insulating media, and the recovery processing tank is used for recovering and processing the insulating media in the metal cylinder.
Preferably, the recovery processing box is provided with a humidity sensor, an infrared gas sensor and an exhaust gas discharge valve, and the humidity sensor, the infrared gas sensor and the exhaust gas discharge valve are electrically connected with an industrial computer.
Preferably, a gas flow sensor is arranged on the gas inlet pipe, a gas pressure sensor is arranged on the gas outlet pipe, and a temperature sensor is arranged on the side wall of the metal cylinder.
Preferably, the filter is communicated with the air pump, and a supplementing pipe is arranged on one side of the air storage tank.
Preferably, the GIS switch equipment comprises a breaker, a disconnecting switch, a grounding switch, a transformer, a lightning arrester, a bus, a connecting piece and an outgoing terminal, and is connected with the oil-gas isolating device.
Preferably, the power transformer is provided with a high-voltage outlet terminal, a neutral point outlet terminal and a low-voltage outlet terminal, the oil-gas isolation devices are provided with a plurality of groups, and the plurality of groups of oil-gas isolation devices are respectively arranged corresponding to the high-voltage outlet terminal, the neutral point outlet terminal and the low-voltage outlet terminal.
Preferably, the neutral point complete device is connected with a neutral point outlet terminal through an oil-gas isolation device, the neutral point complete device is connected with a transformer, an isolating switch and a lightning arrester, and a discharge gap is arranged on the lightning arrester.
Preferably, a high-voltage inlet is arranged on one side of the GIS switch equipment, the GIS switch equipment is connected with a high-voltage outlet end through an oil-gas isolation device, and the GIL power transmission line is connected with a low-voltage outlet end through the oil-gas isolation device.
Preferably, the working steps of the transformer substation are as follows:
step 1: the GIS switch equipment is connected with the high-voltage outlet end, the GIL power transmission line is connected with the low-voltage outlet end, and the GIS switch equipment and the GIL power transmission line are subjected to voltage transformation through a power transformer;
step 2: the power transformer, the isolating switch, the lightning arrester and the discharge gap are all positioned in the metal cylinder, and the insulating medium wraps the high-voltage outlet end, the neutral point outlet end and the low-voltage outlet end, so that the high-voltage outlet end, the neutral point outlet end and the low-voltage outlet end are prevented from being exposed in the air;
step 3: the air pump sends insulating medium into the metal cylinder through the air inlet pipe, so that the concentration of the insulating medium in the metal cylinder is ensured, and the insulating effect is ensured;
step 4: the control valve is opened, the insulating medium in the metal cylinder body enters the recovery treatment box, the treating agent in the recovery treatment box reacts with the insulating medium, and the decomposed gas and the waste gas are removed through reaction;
step 5: the humidity sensor and the infrared gas sensor detect the components of the processed insulating medium, when the insulating medium can be determined to be recycled, the circulating valve is opened, the processed insulating medium flows into the gas storage tank for being fed into the metal cylinder next time, and the insulating effect is ensured by filling;
step 6: the gas pressure sensor detects the pressure of an insulating medium in the metal cylinder, and when the pressure is reduced, the air pump works to supplement the insulating medium;
step 7: when the humidity sensor and the infrared gas sensor judge that the insulating medium cannot be used, the waste gas is recovered through the waste gas exhaust valve, concentrated treatment is carried out, and a new insulating medium is supplemented to the gas storage tank.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, sulfur hexafluoride gas is filled around the transformer as an insulating medium, so that the insulating effect is improved, the insulating distance is effectively reduced, the outline size of the transformer substation is further reduced, the occupied area is effectively reduced, and the influence of the natural environment on the working of the transformer substation is reduced;
2. the invention adopts full-closed insulation, and simultaneously uses the oil-gas isolation device to replace the conventional oil-sulfur hexafluoride sleeve as an equipment interface, thereby further reducing the external dimension of equipment and being applicable to the construction of underground substations and urban substations;
3. according to the invention, the sulfur hexafluoride gas is recovered and treated by the management and control component, the sulfur hexafluoride content in the gas is detected by the sensor, and impurities in the gas are filtered and recovered by the recovery treatment box, so that the gas is ensured to have a sufficient insulating effect, and the situation that operators cannot find the sulfur hexafluoride in time after the sulfur hexafluoride is decomposed, and the insulating protection work of the transformer is influenced is avoided.
Drawings
Fig. 1 is a schematic diagram of an overall assembly top view structure of a fully enclosed insulated substation according to the present invention;
fig. 2 is a schematic diagram of the structure at a in fig. 1.
In the figure: 1. GIS switch equipment; 2. a power transformer; 3. a neutral point kit; 4. a GIL transmission line; 5. a metal cylinder; 6. a management and control assembly; 60. a gas flow sensor; 61. an air inlet pipe; 62. an air pump; 63. a filter; 64. a gas storage tank; 65. a recovery treatment box; 651. an exhaust gas discharge valve; 66. a control valve; 67. a gas pressure sensor; 68. an exhaust pipe; 69. a replenishment pipe; 7. high-voltage incoming lines; 8. an oil-gas isolating device.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
Referring to fig. 1-2, a totally-enclosed insulation substation comprises a GIS switch device 1 (gas-insulated totally-enclosed combined electrical apparatus), a power transformer 2, a neutral point complete device 3 and a GIL power transmission line 4, wherein the GIS switch device 1 comprises a circuit breaker, a disconnecting switch, a grounding switch, a transformer, a lightning arrester, a bus, a connecting piece and an outgoing terminal, a high-voltage outgoing terminal, a neutral point outgoing terminal and a low-voltage outgoing terminal are arranged on the power transformer 2, the GIL power transmission line 4 comprises a grounding shell and a built-in conductor, an insulation medium is arranged between the grounding shell and the built-in conductor, and the GIL power transmission line 4 is used for transmitting high-voltage and high-current power;
the outside of the power transformer 2 is provided with a metal cylinder 5, the metal cylinder 5 is grounded, an oil-gas isolation device 8 is arranged at an interface of the power transformer 2, a plurality of groups of oil-gas isolation devices 8 are arranged, the groups of oil-gas isolation devices 8 are respectively and correspondingly arranged with a high-voltage outlet terminal, a neutral point outlet terminal and a low-voltage outlet terminal, GIS switch equipment 1 is connected with the oil-gas isolation device 8, the neutral point complete equipment 3 is connected with the neutral point outlet terminal through the oil-gas isolation device 8, the neutral point complete equipment 3 is connected with a transformer, an isolation switch and a lightning arrester, a discharge gap is arranged on the lightning arrester, one side of the GIS switch equipment 1 is provided with a high-voltage inlet 7, the GIS switch equipment 1 is connected with the high-voltage outlet terminal through the oil-gas isolation device 8, and the GIL power transmission line 4 is connected with the low-voltage outlet terminal through the oil-gas isolation device 8;
an insulating medium is arranged in the metal cylinder 5, the insulating medium is sulfur hexafluoride gas, one side of the metal cylinder 5 is provided with a management and control component 6, and the management and control component 6 is used for detecting the flow and the components of the insulating medium and timely recovering or supplementing the insulating medium;
the control assembly 6 comprises an air pump 62, an air storage tank 64 and a recovery treatment tank 65, an air inlet pipe 61 is arranged between the air pump 62 and the metal cylinder 5, an air outlet pipe 68 is arranged between the recovery treatment tank 65 and the metal cylinder 5, a control valve 66 is arranged on the air outlet pipe 68, when the impurity content in an insulating medium is more, the recovery treatment tank 65 is used for exhausting air to carry out recovery centralized treatment when the impurity content in the insulating medium is lost, a filter 63 is arranged on one side of the air storage tank 64, and a circulation valve is arranged between the recovery treatment tank 65 and the air storage tank 64;
the gas storage tank 64 is used for storing and precipitating insulating media, impurities are contained in the insulating media, the impurities in the insulating media are promoted to be layered through precipitation, the purity of the conveyed insulating media is convenient to improve, the recovery processing tank 65 is used for recovering and processing the insulating media in the metal cylinder 5, sulfur hexafluoride gas, namely SF6, the density of the gas is about five times that of air, an inert gas is generally not reacted with other materials, and the decomposition products of the SF6 such as SF4, S2F2, SF2, SOF2, SO2F2, SOF4, HF and the like under the action of electric arcs have strong corrosiveness and toxicity, after the insulating media are used for a period of time, part of the components in the insulating media are decomposed to generate impurities, and the recovery processing tank 65 is used for recovering and processing toxic and harmful gases in the recovery processing tank;
the recovery processing box 65 is provided with a humidity sensor, an infrared gas sensor and an exhaust gas discharge valve 651, the humidity sensor, the infrared gas sensor and the exhaust gas discharge valve 651 are electrically connected with an industrial computer, the infrared gas sensor adopts a BSA/QT-HWSF6 series infrared gas sensor, and uses gas to measure the concentration of the absorption characteristic of a specific infrared spectrum, so that sulfur hexafluoride SF6, carbon monoxide CO, carbon dioxide CO2, methane CH4, hydrocarbon HC and the like can be measured, the humidity sensor is used for detecting the water content in sulfur hexafluoride gas, and if the water content is suddenly increased, the leakage of a metal cylinder 5 or a pipeline is indicated, the entry of external air is indicated, an operator is reminded of maintenance, the leakage of sulfur hexafluoride and decomposed gas thereof is avoided, the insulation effect is influenced, and even environmental pollution is caused;
the recovery treatment tank 65 is internally provided with a solid treatment agent filling layer, the solid treatment agent filling layer contains alkali metal and alkaline earth metal oxides or hydroxides, SF6 and decomposed gas thereof pass through the solid treatment agent filling layer and then undergo a neutralization reaction, and then the gas is adsorbed by activated alumina or a molecular sieve, so that the insulating medium is filtered, the purity of SF6 is improved, and the insulating reliability is ensured;
the air inlet pipe 61 is provided with the air flow sensor 60, the air outlet pipe 68 is provided with the air pressure sensor 67, the air flow sensor 60 detects the insulation medium amount supplied by the air pump 62 into the metal cylinder 5, the air pressure sensor 67 is used for detecting the air pressure in the metal cylinder 5, the metal cylinder 5 must be filled with SF6 insulation medium with certain pressure to ensure reliable operation, if the air pressure is reduced, the insulation effect of sulfur hexafluoride gas cannot be effectively ensured, the side wall of the metal cylinder 5 is provided with the temperature sensor, and the air flow sensor 60 adopts a float flowmeter.
The filter 63 is communicated with the air pump 62, the filter 63 is used for filtering impurities and moisture in the insulating medium, the impurities and moisture are prevented from being recycled into the metal cylinder 5, and a supplementing pipe 69 is arranged on one side of the air storage tank 64 and used for timely supplementing sulfur hexafluoride gas.
The working steps are as follows:
the GIS switch device 1 is connected with a high-voltage outlet end, the GIL power transmission line 4 is connected with a low-voltage outlet end, and the GIS switch device 1 and the GIL power transmission line 4 realize transformation through the power transformer 2;
the power transformer 2, the transformer, the isolating switch, the lightning arrester and the discharge gap are all positioned in the metal cylinder 5, and the insulating medium wraps the high-voltage outlet end, the neutral point outlet end and the low-voltage outlet end, so that the high-voltage outlet end, the neutral point outlet end and the low-voltage outlet end are prevented from being exposed in the air;
the air pump 62 sends insulating medium into the metal cylinder 5 through the air inlet pipe 61, so that the concentration of the insulating medium in the metal cylinder 5 is ensured, and the insulating effect is ensured;
after the working time, the insulating medium is consumed, after being decomposed, the control valve 66 is opened, the insulating medium in the metal cylinder 5 enters the recovery processing box 65, the treating agent in the recovery processing box 65 reacts with the insulating medium, the decomposed gas and the waste gas are removed by reaction, and the residual sulfur hexafluoride gas is convenient to be put into use again;
the moisture-sensitive sensor and the infrared gas sensor detect the components of the treated insulating medium, when the components can be recycled, the circulating valve is opened, the treated insulating medium flows into the gas storage tank 64 for being sent into the metal cylinder 5 next time, so that the consumption of sulfur hexafluoride gas is reduced, and meanwhile, the insulating effect is ensured by filling;
the gas pressure sensor 67 detects the pressure of the insulating medium in the metal cylinder 5, when the pressure is reduced, the gap exists in the metal cylinder 5, the insulating medium leaks, the air pump 62 works, the insulating medium is timely supplemented, and the influence on the insulating effect caused by the too low pressure in the metal cylinder 5 is avoided;
when the moisture sensor and the infrared gas sensor determine that the impurity content and the water content of the insulating medium are too high to use, the waste gas is recovered through the waste gas discharge valve 651, concentrated treatment is performed, the recovery treatment tank 65 is replaced, and a new insulating medium is supplied to the gas storage tank 64.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (1)
1. The utility model provides a totally closed insulation substation, includes GIS switchgear (1), power transformer (2), neutral point integrated equipment (3), GIL transmission line (4), its characterized in that, the power transformer (2) outside is equipped with metal barrel (5), power transformer (2) interface department is equipped with oil gas isolating device (8), be equipped with insulating medium in metal barrel (5), metal barrel (5) one side is equipped with management and control subassembly (6), management and control subassembly (6) are used for detecting insulating medium flow and composition to in time retrieve or supply insulating medium;
the control assembly (6) comprises an air pump (62), an air storage tank (64) and a recovery treatment tank (65), an air inlet pipe (61) is arranged between the air pump (62) and the metal cylinder (5), an exhaust pipe (68) is arranged between the recovery treatment tank (65) and the metal cylinder (5), a control valve (66) is arranged on the exhaust pipe (68), a filter (63) is arranged on one side of the air storage tank (64), and a circulation valve is arranged between the recovery treatment tank (65) and the air storage tank (64);
the gas storage tank (64) is used for storing and precipitating insulating media, and the recovery processing tank (65) is used for recovering and processing the insulating media in the metal cylinder (5);
the recovery processing box (65) is provided with a humidity sensor, an infrared gas sensor and an exhaust gas discharge valve (651), and the humidity sensor, the infrared gas sensor and the exhaust gas discharge valve (651) are electrically connected with an industrial computer;
the gas inlet pipe (61) is provided with a gas flow sensor (60), the gas outlet pipe (68) is provided with a gas pressure sensor (67), and the side wall of the metal cylinder (5) is provided with a temperature sensor;
the filter (63) is communicated with the air pump (62), and a supplementing pipe (69) is arranged at one side of the air storage tank (64);
the GIS switch equipment (1) comprises a breaker, an isolating switch, a grounding switch, a mutual inductor, a lightning arrester, a bus, a connecting piece and an outgoing terminal, wherein the GIS switch equipment (1) is connected with an oil-gas isolating device (8);
the power transformer (2) is provided with a high-voltage outlet wire end, a neutral point outlet wire end and a low-voltage outlet wire end, the oil-gas isolating devices (8) are provided with a plurality of groups, and the oil-gas isolating devices (8) are respectively arranged corresponding to the high-voltage outlet wire end, the neutral point outlet wire end and the low-voltage outlet wire end;
the neutral point complete device (3) is connected with a neutral point outlet end through an oil-gas isolation device (8), the neutral point complete device (3) is connected with a transformer, an isolating switch and a lightning arrester, and a discharge gap is arranged on the lightning arrester;
a high-voltage wire inlet (7) is arranged on one side of the GIS switch equipment (1), the GIS switch equipment (1) is connected with a high-voltage wire outlet end through an oil-gas isolation device (8), and the GIL power transmission line (4) is connected with a low-voltage wire outlet end through the oil-gas isolation device (8);
the working steps of the transformer substation are as follows:
step 1: the GIS switch device (1) is connected with a high-voltage outlet end, the GIL power transmission line (4) is connected with a low-voltage outlet end, and the GIS switch device (1) and the GIL power transmission line (4) are subjected to voltage transformation through the power transformer (2);
step 2: the power transformer (2), the transformer, the isolating switch, the lightning arrester and the discharge gap are all positioned in the metal cylinder (5), and the insulating medium wraps the high-voltage outlet wire end, the neutral point outlet wire end and the low-voltage outlet wire end, so that the high-voltage outlet wire end, the neutral point outlet wire end and the low-voltage outlet wire end are prevented from being exposed in the air;
step 3: the air pump (62) sends insulating medium into the metal cylinder (5) through the air inlet pipe (61), so that the concentration of the insulating medium in the metal cylinder (5) is ensured, and the insulating effect is ensured;
step 4: the control valve (66) is opened, the insulating medium in the metal cylinder (5) enters the recovery treatment box (65), the treating agent in the recovery treatment box (65) reacts with the insulating medium, and the decomposed gas and the waste gas are removed through reaction;
step 5: the humidity-sensitive sensor and the infrared gas sensor detect the components of the processed insulating medium, when the insulating medium can be determined to be recycled, a circulating valve is opened, the processed insulating medium flows into a gas storage tank (64) for being fed into a metal cylinder (5) next time, and the insulating effect is ensured by filling;
step 6: the gas pressure sensor (67) detects the pressure of the insulating medium in the metal cylinder (5), and when the pressure is reduced, the air pump (62) works to supplement the insulating medium;
step 7: when the humidity sensor and the infrared gas sensor judge that the insulating medium cannot be used, the exhaust gas is recovered through the exhaust gas discharge valve (651), concentrated treatment is carried out, and a new insulating medium is supplemented to the gas storage tank (64).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310023447.XA CN115832920B (en) | 2023-01-09 | 2023-01-09 | Totally-enclosed insulating transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310023447.XA CN115832920B (en) | 2023-01-09 | 2023-01-09 | Totally-enclosed insulating transformer substation |
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| CN115832920B true CN115832920B (en) | 2023-06-09 |
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| CN105140903A (en) * | 2015-09-21 | 2015-12-09 | 中电新源智能电网科技有限公司 | Transformer neutral point gas insulated substation |
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| FR2938985A1 (en) * | 2008-11-27 | 2010-05-28 | Areva T & D Sa | HIGH VOLTAGE ELECTRICAL DISTRIBUTION UNDER METAL ENVELOPE |
| CN201699337U (en) * | 2010-06-29 | 2011-01-05 | 姬云东 | Railway intelligent box-type substation |
| KR101339883B1 (en) * | 2012-04-20 | 2013-12-10 | 동우전기 주식회사 | SF6 Reduced Eco-Friendly 245kV Voltage Transformer For Gas Insulation Switchgear |
| CN205693236U (en) * | 2016-06-22 | 2016-11-16 | 杭州宏迅电力科技有限公司 | A kind of sulfur hexafluoride gas insulation switch cabinet |
| CN106501447A (en) * | 2016-10-14 | 2017-03-15 | 国网江西省电力公司电力科学研究院 | A kind of method that sulfur hexafluoride gas humidity is accurately measured online in GIS transformer stations |
| CN106532534A (en) * | 2016-12-21 | 2017-03-22 | 江苏其厚智能电气设备有限公司 | Miniaturized preassembled substation for towns |
| CN109243909A (en) * | 2018-09-28 | 2019-01-18 | 厦门闽光电气实业有限公司 | A kind of gas-insulated vacuum load switch |
| CN212543182U (en) * | 2020-06-30 | 2021-02-12 | 杭州璐欣电器制造有限公司 | Compact transformer substation |
| CN113852030A (en) * | 2021-11-09 | 2021-12-28 | 广东电网有限责任公司电力科学研究院 | GIL insulating gas self-circulation filter device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102460870A (en) * | 2009-06-17 | 2012-05-16 | 株式会社东芝 | Gas insulation apparatus |
| CN105140903A (en) * | 2015-09-21 | 2015-12-09 | 中电新源智能电网科技有限公司 | Transformer neutral point gas insulated substation |
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