CN112986730A - Distribution transformer handover test movable detection device suitable for extremely cold environment - Google Patents
Distribution transformer handover test movable detection device suitable for extremely cold environment Download PDFInfo
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Abstract
The invention relates to a movable detection device for a distribution transformer handover test in an extremely cold environment. The movable detection device for the distribution transformer handover test can integrate instruments and meters required by the distribution transformer handover test in the insulation heat-preservation test chamber, keep the room temperature state under the extremely cold condition, provide a proper operating environment and space for the handover test of the distribution transformer, perform the handover test of the distribution transformer under the condition, ensure the smooth performance of the test and provide a basis for the cold start of the transformer under the extremely cold condition.
Description
Technical Field
The invention relates to the field of electricity, in particular to a mobile detection device for a distribution transformer handover test in an extremely cold environment.
Background
Transformers are the most central electrical equipment in electrical power systems, and oil paper insulation is the main insulation form of large transformers. The safe operation of the transformer is directly related to the safety and stability of the power grid. Before the transformer is put into operation, a handover test is required to test the quality condition of the transformer after installation, so that the safe operation of the power transformer is ensured.
The transformer in cold regions such as northeast and northwest of China faces a special problem of low temperature in actual operation, and in the Jilin general areas, the temperature reaches-47 ℃ a few years ago, so that the transformer oil in the transformer gas relay is waxed, and light gas acts; the main transformer in the double-positive area is solidified by the gas relay and the transformer oil in the connecting pipe due to the over-low temperature, so that the transformer is subjected to misoperation of heavy gas relay protection and the like. It can be seen that in the low temperature period in winter, too low temperature may pose a great threat to the safe operation of the transformer.
In summary, in a low temperature environment, when a standby transformer is switched, a new transformer is put into operation, or an old transformer is put into operation again after overhaul, the transformer oil is subjected to a low temperature condition. At present, no related researches are carried out to show whether insulation is caused when the transformer is put into operation at low temperature, so that the cold start technical research of the transformer under the extremely cold condition is deeply developed, and the cold start technical research has important significance on the design, manufacture, operation and maintenance of the power transformer applied to the extremely cold region.
Disclosure of Invention
The invention aims to provide a mobile detection device for a distribution transformer handover test, which can keep the room temperature state of equipment under an extremely cold condition, provides a proper operating environment and space for the handover test of outdoor distribution equipment such as a distribution transformer and the like under the extremely cold condition, and ensures that the cold start of the distribution transformer under the extremely cold condition is smoothly carried out.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a distribution transformer handing-over test movable type detection device suitable for under extremely cold environment, the device is including insulating heat preservation laboratory, hot-blast and new trend feed system, power supply system, workstation, instrument cabinet and low frequency heating device, with the required instrument integration of distribution transformer handing-over test in insulating heat preservation laboratory, keeps the room temperature state under extremely cold condition, for distribution transformer's handing-over test carry out provide suitable operating environment and space to carry out distribution transformer's handing-over test under this condition, the guarantee is experimental to go on smoothly.
The main body of the insulation heat-preservation test chamber is made of thickened square tubes, 1.5mm steel plates of external enclosing plates are bent into reinforcing ribs and welded and assembled to form the insulation heat-preservation test chamber, a 100mm heat-preservation layer is designed, and heat-preservation materials are filled with high-performance aluminum silicate blocky silk floss. The interior of the laboratory is made of insulating flame-retardant materials, so that safety accidents caused by high-voltage leakage are prevented. The door of the test room adopts an internal and external double-opening structure design, and the heat-insulating curtain is designed on the inner side of the test room to prevent cold air from invading and ensure that the internal temperature of the test room changes rapidly.
The switch is turned on when the hot air and fresh air supply system is needed, the fresh air system automatically works, and the switch is turned off after the fresh air supply system is completed. Hot-blast feed system adopts wall-hanging heated air circulation, guarantee that inside temperature is in the room temperature state, new trend system pipe way design is in inside intermediate layer, do not occupy inner space and outside size, the business turn over wind gap all designs in the laboratory bottom, the filter plate is crossed in the air intake design, can prevent effectively that PM2.5 air pollution laboratory air, and the air inlet of new trend system is absolutely designed with the outside with the air-out and is linked to each other, guarantee that the laboratory is in not airtight state under any circumstance, prevent because sealed safe dangerous's that leads to emergence.
The workstation is including can overturning leaning on wall workstation and folded cascade test table chair, guarantees to overturn when not using and hugs closely the wall, does not occupy the space in the laboratory, and 1 drawer cubicle is placed to the lower part, conveniently places the file and uses, designs the socket in test table chair top, satisfies basic official working or other usage uses (220V power supply), disposes 1 chair, supplies the experimenter work and uses.
The power supply system comprises a main box, the voltage grade is 380V, the frequency is 50HZ, and the capacity is 10 KW; the power supply device mainly supplies power for a hot air supply system, circuit lighting, a socket and other small laboratory test instruments; the lighting switch is designed on the left side of the entrance door, so that the lighting lamp can be turned on after the laboratory enters the laboratory conveniently. The lead hole is filled with a high-low temperature resistant silica gel plug, the electric wire passes through the center, and the silica gel plug and the electric wire are tightly wrapped to ensure that the sealing is not performed or cold air enters a laboratory.
The instrument cabinet comprises a direct current resistance tester, a transformation ratio tester, an insulation resistance tester, a direct current high voltage generator and a dielectric loss measuring instrument, and can be used for performing handover tests including direct current resistance tests of a distribution transformer, voltage ratio tests of all tapped windings, winding leakage current tests, dielectric loss angle tests and the like.
The input voltage of the low-frequency heating device is 380/10kV, the heating power is 1200kW, and the oil temperature of the distribution transformer can be heated, so that the oil temperature is kept above 30 ℃.
By utilizing the mobile detection device for the distribution transformer handover test in the extremely cold environment, the control method of the device comprises the following steps:
(1) presetting the temperature and humidity to be reached in an insulation heat-preservation test room, and opening a hot air and fresh air supply system;
(2) after the temperature and the humidity in the box body reach required values, turning on a lighting switch and a turnable wall-leaning workbench, and placing the tested transformer in the detection device;
(3) connecting a low-frequency heating device with the tested transformer, and heating the transformer oil to 30 ℃ by adopting the low-frequency heating device;
(4) determining a handover test item of the tested transformer according to national standard requirements, taking out corresponding required instrument equipment from the instrument cabinet, and carrying out wiring according to a handover test scheme and principle;
(5) recording the indoor temperature during measurement, measuring parameter values required by a handover test by using a measuring instrument, and comparing the parameter values with factory data of the tested transformer;
(6) the instrument was returned to the home position and all power supplies in the laboratory were disconnected.
Compared with the prior art, the movable detection device for the distribution transformer handover test in the extremely cold environment, provided by the invention, has the advantages that handover test instruments required by the distribution transformer are integrated in the insulation heat-preservation test room, the temperature of the transformer can be raised through the heat-preservation test room and the low-frequency heating device, the handover test can be carried out on the transformer under a relatively proper temperature and environment, and the support is provided for the cold start technology of the transformer in the extremely cold environment.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the embodiments are a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of the overall structure of the present invention, the mobile detection device includes an insulation and heat preservation laboratory 7, a hot air and fresh air supply system 3, a power supply system 4, a workbench 2, an instrument cabinet 8 and a low frequency heating device 9, the device can integrate instruments and meters required by a distribution transformer handover test in the insulation and heat preservation laboratory 7, keep a room temperature state under an extremely cold condition, provide a suitable operating environment and space for the handover test of the distribution transformer, and perform the handover test of the distribution transformer under the condition, thereby ensuring the smooth performance of the test.
By utilizing the mobile detection device for the distribution transformer handover test in the extremely cold environment, the control method of the device comprises the following steps:
(1) presetting the temperature and humidity to be reached in an insulation heat-preservation test room, and opening a hot air and fresh air supply system;
(2) after the temperature and the humidity in the box body reach required values, turning on a lighting switch and a turnable wall-leaning workbench, and placing the tested transformer in the detection device;
(3) connecting a low-frequency heating device with the tested transformer, and heating the transformer oil to 30 ℃ by adopting the low-frequency heating device;
(4) determining a handover test item of the tested transformer according to national standard requirements, taking out corresponding required instrument equipment from the instrument cabinet, and carrying out wiring according to a handover test scheme and principle;
(5) recording the indoor temperature during measurement, measuring parameter values required by a handover test by using a measuring instrument, and comparing the parameter values with factory data of the tested transformer;
the instrument was returned to the home position and all power supplies in the laboratory were disconnected.
Example (b):
the utility model provides a distribution transformer handing-over test movable type detection device suitable for under extremely cold environment, movable type detection device is including insulating heat preservation laboratory 7, hot-blast and new trend feed system 3, power supply system 4, workstation 2, instrument cabinet 8 and low frequency heating device 9, the device can be integrated in insulating heat preservation laboratory 7 with distribution transformer handing-over test required instrument and meter, keep the room temperature state under extremely cold condition, for distribution transformer's handing-over test carry on provide suitable operating environment and space, and carry out distribution transformer's handing-over test under this condition, the guarantee is experimental to be gone on smoothly
The control method of the device comprises the following steps:
step (1), presetting the temperature and humidity to be reached in an insulation heat-preservation laboratory, opening a hot air and fresh air supply system, after the temperature and humidity in a box body reach required values, opening a lighting switch and a turnable wall-leaning workbench, and placing a tested transformer in a detection device;
step (2), connecting a low-frequency heating device with the tested transformer, and heating the transformer oil to 30 ℃ by using the low-frequency heating device;
step (3), taking out the direct current resistance tester from the instrument cabinet, adopting the direct current resistance tester to measure each tap of the high-voltage winding and the direct current resistance at the low-voltage side respectively, and for the direct current resistance with a neutral point, preferably measuring the single-phase direct current resistance, and recording the environmental temperature during measurement so as to convert and compare the measured environmental temperature with a factory value;
step (4), converting the measured value to the same temperature by adopting a formula R2-R1 (T + T2)/(T + T1) (wherein R1 and R2 respectively represent resistance values at temperatures T1 and T2, T1 represents the temperature of a transformer winding during a handover test, T represents a resistance temperature constant, 235 is taken as a copper wire, and 225 is taken as an aluminum wire); the difference between windings of each phase of the three-phase transformer of 1600kVA or below is not more than 4%, and the difference between windings among lines of the three-phase transformer without the neutral point outgoing line winding is not more than 2%. In the transformer with the voltage of more than 1600kVA, the difference between the windings of all phases is not more than 2 percent, and the difference between the windings among lines is not more than 1 percent without the winding of a neutral point outgoing line.
And (5) returning the instrument to the original position, and disconnecting all power supplies in the laboratory.
Those not described in detail in this specification are within the knowledge of those skilled in the art.
Claims (8)
1. The utility model provides a distribution transformer handing-over test movable type detection device suitable for under extremely cold environment, a serial communication port, the device is including insulating heat preservation laboratory, hot-blast and new trend feed system, power supply system, workstation, instrument cabinet and low frequency heating device, with distribution transformer handing-over test required instrument and meter integration in the insulating heat preservation laboratory, make keep the room temperature state under the extremely cold condition in the insulating heat preservation laboratory, for distribution transformer's handing-over test carry on provide suitable operating environment and space to carry out distribution transformer's handing-over test under this condition, the guarantee is experimental goes on smoothly.
2. The mobile detection device for the distribution transformer handover test in the extremely cold environment of claim 1, wherein: the insulation heat preservation laboratory main part is by the preparation of thickening side pipe, and outside bounding wall is bent into strengthening rib welding equipment by 1.5mm steel sheet and is formed, outside bounding wall sets up 100mm heat preservation, and insulation material adopts the cubic silk floss of high performance aluminium silicate to fill. The interior of the laboratory is made of insulating flame-retardant materials, so that safety accidents caused by high-voltage leakage are prevented. The door of the test room adopts an internal and external double-opening structure design, and the heat-insulating curtain is designed on the inner side of the test room to prevent cold air from invading and ensure that the internal temperature of the test room changes rapidly.
3. The mobile detection device for the distribution transformer handover test in the extremely cold environment of claim 1, wherein: the switch is opened to hot-blast and new trend feed system when needs, new trend system automatic work, wait to accomplish the back, close the switch can, hot-blast feed system adopts wall-hanging heated air circulation, guarantees that inside temperature is in the room temperature state, new trend system pipeline sets up in inside intermediate layer, does not occupy inner space and external dimension, and the business turn over wind gap all designs in the laboratory bottom, and the air intake sets up filter plate, prevents PM2.5 air pollution laboratory air, and the air inlet and the air outlet setting of new trend system link to each other with the outside, guarantee under any circumstance that the laboratory is in not airtight state, prevent because sealed safe dangerous's that leads to emergence.
4. The mobile detection device for the distribution transformer handover test in the extremely cold environment of claim 1, wherein: the workstation is including can overturning leaning on wall workstation and folded cascade test table chair, the workstation can overturn when not using and hug closely the wall, does not occupy the space in the laboratory, 1 drawer cubicle is placed to the workstation lower part, conveniently places the file and uses test table chair top design socket satisfies basic official working or other usage and uses, 1 chair of test table chair configuration supplies the experimenter to work and uses.
5. The mobile detection device for the distribution transformer handover test in the extremely cold environment of claim 1, wherein: the power supply system comprises a main box, the voltage grade is 380V, the frequency is 50HZ, and the capacity is 10 KW; the power supply system supplies power for a hot air supply system, circuit lighting, a socket and other laboratory small-sized test instruments; the lighting switch is designed on the left side of the gate of the laboratory, so that the lighting lamp can be turned on after the lighting switch enters the laboratory conveniently. The lead hole is filled with a high-temperature and low-temperature resistant silica gel plug, the electric wire penetrates through the center, and the silica gel plug and the electric wire are tightly wrapped to guarantee sealing and prevent cold air from entering a laboratory.
6. The mobile detection device for the distribution transformer handover test in the extremely cold environment of claim 1, wherein: the instrument cabinet comprises a direct current resistance tester, a transformation ratio tester, an insulation resistance tester, a direct current high-voltage generator and a dielectric loss measuring instrument, and the instrument cabinet is used for performing handover tests including direct current resistance tests of a distribution transformer, voltage ratio tests of all tapping of windings, winding leakage current tests and dielectric loss angle tests.
7. The mobile detection device for the distribution transformer handover test in the extremely cold environment of claim 1, wherein: the low-frequency heating device is used for heating the oil temperature of the distribution transformer, wherein the input voltage of the low-frequency heating device is 380/10kV, the heating power is 1200kW, and the oil temperature is kept above 30 ℃.
8. The mobile detection device for the distribution transformer handover test in the extremely cold environment is used in any one of claims 1 to 7, and the control method of the device comprises the following steps:
(1) presetting the temperature and humidity to be reached in an insulation heat-preservation laboratory, and opening a hot air and fresh air supply system;
(2) after the temperature and the humidity in the box body reach required values, turning on a lighting switch and a turnable wall-leaning workbench, and placing the transformer to be tested in the detection device;
(3) connecting a low-frequency heating device with a transformer to be tested, and heating transformer oil to 30 ℃ by adopting the low-frequency heating device;
(4) determining a handover test item of the transformer to be tested according to national standard requirements, taking out corresponding required instrument equipment from the instrument cabinet, and carrying out wiring according to a scheme and a principle of the handover test;
(5) recording the indoor temperature during measurement, measuring parameter values required by a handover test by using a measuring instrument, and comparing the parameter values with factory data of the transformer to be tested;
(6) the instrument is returned to the original position, and all power supplies in the laboratory are disconnected.
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