CN115223774A - Dry-type transformer state monitoring device and control method thereof - Google Patents
Dry-type transformer state monitoring device and control method thereof Download PDFInfo
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- CN115223774A CN115223774A CN202210662305.3A CN202210662305A CN115223774A CN 115223774 A CN115223774 A CN 115223774A CN 202210662305 A CN202210662305 A CN 202210662305A CN 115223774 A CN115223774 A CN 115223774A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/085—Cooling by ambient air
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F27/402—Association of measuring or protective means
- H01F2027/406—Temperature sensor or protection
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Abstract
The invention discloses a dry-type transformer state monitoring device and a control method thereof, wherein the state monitoring device comprises a shell, a control device is arranged in the shell, and a display part, a button part, an interface part and a communication part which are respectively and electrically connected with the control device are arranged on the shell; the display part is used for displaying real-time data acquired by the state monitoring device and realizing fault alarm, the button part is used for adjusting working parameters of the state monitoring device, the interface part is used for acquiring the working temperature of the dry-type transformer and realizing the working control of the cooling fan and the dry-type transformer, and the communication part is used for transmitting the data acquired by the state monitoring device to external equipment; the utility model discloses dry-type transformer state monitoring device can transmit the data that state monitoring device acquireed and dry-type transformer's fault information to external equipment through communication portion, makes things convenient for the staff to know dry-type transformer's operating condition in real time, reduces staff's intensity of labour.
Description
Technical Field
The invention relates to the technical field of transformer state monitoring, in particular to a dry-type transformer state monitoring device and a control method thereof.
Background
At present, the dry type transformer has poor heat balance performance, and in order to prevent the winding temperature of the dry type transformer from being overhigh and damaging the transformer, a dry type transformer temperature controller is adopted to monitor the three-phase temperature of the dry type transformer, so that the stability and the safety degree of the dry type transformer during working can be improved, and accidents caused by overhigh temperature rise are avoided.
The traditional dry-type transformer temperature controller can detect and display the operating temperature of a transformer winding, can drive a fan to start and stop to realize forced air cooling, and can give an alarm on site according to the fault condition, but operation and maintenance personnel need to check the working data of the temperature controller regularly, so that the labor cost is high, and the labor intensity is high; further, when a failure occurs, a problem of a maintenance lag may occur.
Furthermore, the traditional dry-type transformer temperature controller only can control the start and stop of the cooling fan, the control method is simple, and the problem of energy waste exists.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide a dry-type transformer state monitoring device, which includes a communication unit, so that a worker can know the working condition of the dry-type transformer in real time, and the labor intensity of the worker is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dry-type transformer state monitoring device comprises a shell, wherein a control device is arranged in the shell, and a display part, a button part, an interface part and a communication part which are respectively and electrically connected with the control device are arranged on the shell; the display part is used for displaying real-time data acquired by the state monitoring device and realizing fault alarm, the button part is used for adjusting working parameters of the state monitoring device, the interface part is used for acquiring the working temperature of the dry-type transformer and realizing the working control of the cooling fan and the dry-type transformer, and the communication part is used for transmitting the data acquired by the state monitoring device to external equipment.
In the dry-type transformer state monitoring device, the display part comprises a display screen and a plurality of indicator lamps which are respectively electrically connected with the control device, the display screen is used for displaying real-time data acquired by the state monitoring device, and the indicator lamps are used for indicating the working state of the state monitoring device and realizing working alarm; the button part comprises a plurality of control buttons which are respectively and electrically connected with the control device, and the interface part comprises a plurality of wiring terminals which are respectively and electrically connected with the control device; the communication part comprises a 485 communication interface and an Ethernet interface which are respectively electrically connected with the control device.
In the dry-type transformer state monitoring device, the shell comprises a base and a panel fixedly arranged on the front side of the base, and the cross sectional area of the panel is larger than that of the base; the display part and the button part are respectively arranged on the panel, the interface part and the communication part are respectively arranged at the rear side of the base, radiating fins are respectively arranged at the left side and the right side of the base, one end of each radiating fin is abutted against the panel, and the other end of each radiating fin is detachably connected with the base.
In the state monitoring device of the dry-type transformer, one side of the radiating fin is provided with a plurality of radiating strips, the other side of the radiating fin is provided with a stud and one or more positioning blocks, and the base is provided with a connecting hole and one or more positioning grooves; the connecting hole is connected with the stud in a matched mode, and the positioning block is connected with the positioning groove in a matched mode.
The invention also correspondingly provides a control method of the dry-type transformer state monitoring device, which is used for realizing the working control of the dry-type transformer state monitoring device, wherein the state monitoring device is respectively connected with a plurality of temperature sensors and a plurality of cooling fans through interface parts, and the temperature sensors are used for detecting the winding temperature of the dry-type transformer; the control method comprises the following steps:
presetting the working temperature, the temperature rise amplitude, the over-temperature alarm temperature, the over-temperature tripping temperature and the fan stopping temperature of a fan in a control device in advance;
the control device acquires real-time temperature fed back by the temperature sensor;
when the real-time temperature is more than or equal to the preset working temperature of the fan, the control device controls part of the cooling fan to start working;
when the working temperature of the fan is less than the real-time temperature and less than the overtemperature alarm temperature, and the rising amplitude of the real-time temperature is greater than the preset temperature rising amplitude within a certain time, the control device controls and increases the running frequency of the started cooling fan;
when the real-time temperature is larger than or equal to the preset overtemperature alarm temperature, the control device controls the display part and the communication part to output overtemperature alarm signals and controls the remaining cooling fans to be started, and the control device controls all the fans to work at the preset maximum operation frequency;
when the real-time temperature is larger than or equal to the preset over-temperature tripping temperature, the control device controls the display part and the communication part to output a tripping signal and controls the dry-type transformer to trip.
In the control method, the control method further includes:
presetting the maximum detection temperature and the minimum detection temperature of a state monitoring device in a control device;
the control device acquires real-time temperature fed back by the temperature sensor;
when the real-time temperature is higher than the preset maximum detection temperature or lower than the preset minimum detection temperature, the control device controls the display part and the communication part to output a fault alarm signal.
In the control method, the control method further includes:
when the control device receives a control instruction of the simulation test and the real-time temperature is larger than or equal to the preset over-temperature tripping temperature, the control device controls the display part and the communication part to output a tripping signal, and the dry-type transformer does not execute a tripping action.
In the control method, the control device may obtain the three-phase current of the dry type transformer through an interface, and the control method further includes:
setting a maximum current value in the control device in advance;
the control device obtains three-phase currents, and when any one phase current is larger than or equal to a preset current maximum value, the control device controls the dry type transformer to delay for a certain time and then execute a tripping action, and controls the communication part and the display part to output a tripping signal.
In the control method, the control device may obtain the three-phase voltage through an interface portion, and the control method further includes:
when the three-phase voltage is greater than 80% of rated voltage and the voltage is kept stable for a certain time, the control device controls the display part and the communication part to output information that the dry-type transformer works normally.
In the control method, the control method further includes:
when any phase voltage is less than or equal to the preset low-voltage protection voltage value, the control device controls the dry type transformer to delay for a certain time and then execute tripping action, and controls the communication part and the display part to output tripping signals.
Has the advantages that:
the invention provides a dry-type transformer state monitoring device, which can transmit data acquired by the state monitoring device and fault information of the dry-type transformer to external equipment through a communication part, thereby facilitating workers to know the working state of the dry-type transformer in real time and reducing the labor intensity of the workers; and the working parameters of the state monitoring device can be adjusted through the button part, so that the state monitoring device can be matched with various dry-type transformers, and the use experience of users is improved.
In addition, the invention also correspondingly provides a control method of the dry-type transformer state monitoring device, which can adjust the working state of the cooling fan according to the temperature preset in the control device, ensure the effective cooling of the dry-type transformer, reduce the working energy consumption of the cooling fan and achieve the purpose of energy saving.
Drawings
Fig. 1 is a schematic view of a first structure of a dry-type transformer state monitoring device according to the present invention;
fig. 2 is a schematic view of a second structure of the dry-type transformer state monitoring device provided by the present invention;
FIG. 3 is a first logic flow diagram of a control method provided by the present invention;
FIG. 4 is a second logic flow diagram of the control method provided by the present invention;
FIG. 5 is a third logic flow diagram of a control method provided by the present invention;
fig. 6 is a fourth logic flow diagram of the control method provided by the present invention.
Description of the main element symbols: 11-panel, 12-base, 13-cover plate, 14-positioning groove, 15-connecting hole, 21-display screen, 22-indicator light, 3-control button, 4-wiring terminal, 51-485 communication interface, 52-Ethernet interface, 6-heat sink, 61-heat sink strip, 62-positioning block, 63-stud.
Detailed Description
The invention provides a dry-type transformer state monitoring device and a control method thereof, and in order to make the purpose, technical scheme and effect of the invention clearer and clearer, the invention is further described in detail by referring to the attached drawings and embodiments.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, and are not to be construed as limiting the present invention; in addition, the terms "mounted", "connected", etc. should be construed broadly, and those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.
Referring to fig. 1 and 2, the present invention provides a dry type transformer state monitoring device, including a housing, a control device disposed in the housing, and a display unit, a button unit, an interface unit and a communication unit disposed on the housing and electrically connected to the control device respectively; the display part is used for displaying real-time data acquired by the state monitoring device and realizing fault alarm, the button part is used for adjusting working parameters of the state monitoring device, the interface part is used for acquiring the working temperature of the dry-type transformer and realizing the working control of the cooling fan and the dry-type transformer, and the communication part is used for transmitting the data acquired by the state monitoring device to external equipment.
According to the state monitoring device for the dry-type transformer, when the dry-type transformer actually works, the working current, the working voltage and the winding temperature of the dry-type transformer are obtained through the interface part, and the interface part is connected with the cooling fan and the dry-type transformer, so that the working control of the cooling fan and the tripping action of the dry-type transformer are realized; the operation data of the dry-type transformer and the fault information of the dry-type transformer, which are acquired by the control device, can be displayed through the display part, or the data and the information are transmitted to external equipment through the communication part, wherein the external equipment can be central monitoring equipment of a transformer substation or mobile equipment of workers, so that the workers can know the working state of the dry-type transformer in real time conveniently, and the labor intensity of the workers is reduced; furthermore, the working parameters of the state monitoring device can be adjusted by the staff through the button part, so that the state monitoring device can be adapted to various dry-type transformers, and the use experience of users is improved.
Further, referring to fig. 1 and fig. 2, the display portion includes a display screen 21 and a plurality of indicator lights 22 electrically connected to the control device, respectively, and the display screen 21 is used for displaying real-time data acquired by the state monitoring device, such as temperature data, voltage data, current data, and the like; the indicator light 22 is used for indicating the working state of the state monitoring device and realizing working alarm; the button part comprises a plurality of control buttons 3 which are respectively and electrically connected with the control device, and the interface part comprises a plurality of wiring terminals 4 which are respectively and electrically connected with the control device; the communication part comprises a 485 communication interface 51 and an Ethernet interface 52 which are respectively electrically connected with the control device.
In one embodiment, the display part includes 4 indicator lamps 22, and 4 indicator lamps 22 are respectively used for indicating whether the state monitoring device is in a normal communication state, whether the dry-type transformer has a fault problem, whether the dry-type transformer performs a trip action, and whether the dry-type transformer is in a normal working state; the button part comprises 6 control buttons 3, the control buttons 3 are reset buttons, and the 6 control buttons 3 are respectively used for executing upward movement, downward movement, leftward movement, rightward movement, ending and confirming actions.
In one embodiment, a wireless communication chip is arranged in the control device, and the wireless communication chip can be a bluetooth chip or a WIFI chip to realize wireless transmission of data and information, so that the use flexibility of the state monitoring device is further improved.
Further, referring to fig. 1 and 2, the housing includes a base 12 and a panel 11 fixed on a front side of the base 12, and a cross-sectional area of the panel 11 is larger than a cross-sectional area of the base 12; the display part and the button part are respectively arranged on the panel 11, the interface part and the communication part are respectively arranged at the rear side of the base 12, the left side and the right side of the base 12 are respectively provided with a radiating fin 6, one end of the radiating fin 6 is abutted against the panel 11, and the other end of the radiating fin 6 is detachably connected with the base 12; the panel 11 with the large cross-sectional area and the radiating fins 6 are arranged, so that the radiating of the state monitoring device can be realized, and the stability and the safety of the state monitoring device during working are improved.
Further, referring to fig. 2, one side of the heat sink 6 is provided with a plurality of heat sink strips 61, the other side of the heat sink 6 is provided with a stud 63 and one or more positioning blocks 62, and the base 12 is provided with a connecting hole 15 and one or more positioning grooves 14; the connecting hole 15 is matched and connected with the stud 63 to realize the fixation of the heat sink 6; the positioning block 62 is matched and connected with the positioning groove 14, so that the radiating fin 6 is quickly positioned and installed, the radiating fin 6 can be prevented from shaking left and right in the working process of the state monitoring device, and the stability of the radiating fin 6 in the working process is improved; in one embodiment, the connection hole 15 is bolted to the stud 63; the heat dissipation strip 61, the stud 63 and the positioning block 62 are respectively integrated with the heat dissipation sheet 6, five heat dissipation strips 61 are arranged on one side of the heat dissipation sheet 6, 3 positioning blocks 62 are arranged on the other side of the heat dissipation sheet 6, and 3 positioning grooves 14 are correspondingly formed in the shell.
Further, still be provided with on the casing with controlling means electric connection's infrared receiver, infrared receiver is used for receiving the infrared signal of infrared remote control transmission, makes staff's accessible infrared remote control remote adjustment state monitoring device's working parameter, improves state monitoring device's use flexibility ratio.
Further, still be provided with in the casing with controlling means electric connection's audible alarm, audible alarm can be miniature audio amplifier or bee calling organ, and when trouble problem or dry-type transformer execution tripping operation action, the accessible audible alarm realizes audible alarm, makes the staff that is located the dry-type transformer periphery can carry out the maintenance to dry-type transformer fast.
Further, a cover plate 13 is disposed at the rear side of the base 12, the cover plate 13 is detachably connected to the base 12, such as by bolts, the interface portion and the communication portion are disposed on the cover plate 13, and the control device is disposed in the base 12; when a line fault problem or a wiring abnormal problem occurs, the operation and maintenance personnel can open the cover plate 13 so as to maintain the control device in the cover plate 13, and the operation and maintenance difficulty is reduced.
Referring to fig. 3 to fig. 6, the present invention further provides a control method of a dry-type transformer state monitoring apparatus, where the control method is used to implement operation control of the dry-type transformer state monitoring apparatus, the state monitoring apparatus is respectively connected to a plurality of temperature sensors and a plurality of cooling fans, and the temperature sensors are used to detect winding temperatures of the dry-type transformer; the control method comprises the following steps:
s100, presetting the working temperature, the temperature rise amplitude, the over-temperature alarm temperature, the over-temperature tripping temperature and the fan stopping temperature of a fan in a control device; in one embodiment, the fan operating temperature may be 100 ℃, the temperature rise temperature may be 3 ℃, the over-temperature alarm temperature may be 130 ℃, the over-temperature trip temperature may be 150 ℃, and the over-temperature trip temperature may be set by a worker according to performance parameters of the dry-type transformer and an operating environment.
S200, the control device acquires real-time temperature fed back by the temperature sensor;
s300, when the real-time temperature is larger than or equal to the preset working temperature of the fan, the control device controls a part of cooling fans to start working; specifically, when the real-time temperature is larger than or equal to the preset working temperature of the fan, if the cooling fans comprise N cooling fans, N is a multiple of 2, the control device firstly controls N/2 cooling fans to start working, and if N is not a multiple of 2, the control device firstly controls N/2+1 cooling fans to start working; for example, if the number of the cooling fans is 6, the control device can control 3 cooling fans to start working; when the cooling fan starts to work, the control device controls the cooling fan to run at a preset working frequency, and the preset working frequency is smaller than the maximum running frequency of the cooling fan.
S400, when the working temperature of the fan is smaller than the real-time temperature and smaller than the overtemperature alarm temperature, and the rising amplitude of the real-time temperature is larger than the preset temperature rise amplitude within a certain time, the control device controls and increases the running frequency of the started cooling fan so as to improve the cooling effect on the dry-type transformer, so that the temperature rise amplitude is reduced or the temperature of a winding of the dry-type transformer is reduced; in one embodiment, the certain time is 1 minute, and the certain time can be set by a worker according to the working environment and working parameters of the dry-type transformer.
S500, when the real-time temperature is larger than or equal to the preset overtemperature alarm temperature, the control device controls the display part and the communication part to output overtemperature alarm signals and controls the remaining cooling fans to be started, and the control device controls all the fans to work at the preset maximum operation frequency, so that the temperature of the winding of the dry-type transformer is quickly reduced; specifically, the control device controls the alarm indicator lamp 22 to be turned on, and outputs an alarm signal with overhigh temperature in a wired or wireless communication mode, so that the working personnel can know that the winding of the dry-type transformer has the overtemperature problem in time.
S600, when the real-time temperature is larger than or equal to a preset over-temperature tripping temperature, the control device controls the display part and the communication part to output a tripping signal and controls the dry-type transformer to trip; specifically, after the dry type transformer performs the trip action, the control device controls the trip indicator lamp 22 to be turned on, and outputs a trip signal in a wired or wireless communication manner, so that a worker can perform the restart action of the dry type transformer in time.
According to the control method disclosed by the application, the working state of the cooling fan can be adjusted according to the real-time winding temperature fed back by the temperature sensor, so that the dry-type transformer can effectively dissipate heat, meanwhile, the working energy consumption of the cooling fan is reduced, and the purpose of energy conservation is achieved.
Further, referring to fig. 4, the control method further includes the steps of:
s101, presetting the maximum detection temperature and the minimum detection temperature of a state monitoring device in a control device;
s200, the control device acquires real-time temperature fed back by the temperature sensor;
s700, when the real-time temperature is higher than a preset maximum detection temperature or lower than a preset minimum detection temperature, the control device controls the display part and the communication part to output a fault alarm signal; specifically, the control device controls the alarm indicator lamp 22 to be turned on, and outputs a signal of abnormal work of the temperature sensor to the staff in a wired or wireless communication mode; in one embodiment, the maximum detection temperature is 240 ℃ and the minimum detection temperature is-30 ℃, which can be set by a worker according to performance parameters of the temperature sensor.
Further, referring to fig. 3, the control method further includes the steps of:
s610, when the control device receives a control instruction of a simulation test and the real-time temperature is larger than or equal to the preset over-temperature tripping temperature, the control device controls the display part and the communication part to output a tripping signal, and the dry-type transformer does not execute a tripping action; specifically, the control device controls the trip indicator lamp 22 to be turned on, and outputs a trip signal to the operator through the communication part, indicating that the communication function is normal.
When the simulation test is carried out, in order to avoid causing the dry type transformer to be tripped by mistake, the simulation test does not support the tripping function, but the tripping indicating lamp 22 is normally lightened; in addition, the cooling fan and the warning indicator lamp 22 are normally operated when the simulation test is performed.
Before the state monitoring device is put into operation formally, the state monitoring device can zero the temperature of each phase of the transformer, is also used for receiving real-time data fed back by three second temperature sensors, and the three second temperature sensors are respectively used for acquiring three-phase temperature; specifically, the zeroing of the temperature of each phase comprises the following steps:
s1010, acquiring actual temperature of each phase of the dry-type transformer by a control device, and inputting the actual temperature into a state detection device through a button part after the actual temperature is detected by a worker on the spot;
s1020, the control device acquires the real-time temperature of the three phases fed back by the second temperature sensor;
s1030, comparing the actual temperature of the three phases with the real-time temperature of the three phases, if deviation exists, judging whether the deviation exceeds a preset compensation range, if the deviation exceeds the preset compensation range, lighting the alarm indicator lamp 22, and controlling the communication part to output the information of the abnormal work of the second temperature sensor by the control device; if the temperature does not exceed the preset compensation range, compensating the real-time temperature of the three phases; in one embodiment, the compensation range is-19.9 ℃ to +19.9 ℃.
Further, referring to fig. 5, the control device may obtain the three-phase current of the dry-type transformer through the interface, and the control method further includes the steps of:
s810, setting a current maximum value in the control device in advance;
s820, the control device obtains three-phase currents, when any one phase current is larger than or equal to a preset current maximum value, the control device controls the dry-type transformer to delay for a certain time and then execute a tripping action, and controls the communication part and the display part to output a tripping signal; specifically, the control device controls the tripping signal lamp to be lightened, and outputs a tripping signal to a worker in a wired or wireless communication mode; in one embodiment, the certain time may be 30 seconds; the maximum current value and the certain time can be set by workers according to working parameters and working environments of the dry-type transformer.
The control method disclosed by the application can also monitor the three-phase current of the dry-type transformer in real time, when the current is too large, the control device controls the dry-type transformer to delay for a certain time and then execute the tripping action, the relay protection effect is achieved, the overcurrent protection is realized, and the safety degree of the dry-type transformer during working is improved.
Further, referring to fig. 6, the control device may obtain the three-phase voltage of the dry type transformer through the interface part, and the control method further includes the steps of:
s910, when the three-phase voltages are all larger than 80% of rated voltage and the voltages are kept stable for a certain time, the control device controls the display part and the communication part to output information that the dry-type transformer works normally, specifically, the control device controls the work indicator lamp 22 to be lightened, and outputs the information that the dry-type transformer works normally to a worker in a wired or wireless communication mode; otherwise, when any one of the above conditions is not met, the control device controls the fault indicator lamp 22 to be turned on, and outputs unstable working information of the dry-type transformer to workers in a wired or wireless communication mode; in one embodiment, the certain time may be 2 seconds, and the certain time and the rated voltage may be preset in the control device by a worker according to the operating parameters and the operating environment of the dry-type transformer.
Further, referring to fig. 6, the control method further includes the steps of:
s920, when any phase voltage is less than or equal to a preset low-voltage protection voltage value, the control device controls the dry-type transformer to delay for a certain time and then execute a tripping action, and controls the communication part and the display part to output a tripping signal; specifically, the control device controls the tripping signal lamp to be lightened, and outputs a tripping signal to a worker in a wired or wireless communication mode; in one embodiment, the predetermined time may be 30 seconds, and the predetermined time and the low voltage protection value may be preset in the control device by a worker according to an operating parameter of the dry type transformer and an operating environment.
The control method disclosed by the application can also monitor the three-phase voltage of the dry-type transformer in real time, when the voltage is too low, the control device controls the dry-type transformer to delay for a certain time and then execute the tripping action, so that the relay protection effect is achieved, the low-voltage protection is realized, and the safety degree of the dry-type transformer during working is improved.
Further, referring to fig. 6, the control method further includes the steps of:
s930, when any one-phase voltage is larger than or equal to a preset voltage fixed value, the control device controls the dry-type transformer to delay for a certain time and then execute a tripping action, and controls the communication part and the display part to output a tripping signal; specifically, the control device controls the tripping signal lamp to be lightened, and outputs a tripping signal to a worker in a wired or wireless communication mode; in one embodiment, the certain time may be 30 seconds, and the voltage setting value and the certain time may be preset in the control device by a worker according to the working parameters and the working environment of the dry-type transformer.
The control method disclosed by the application can also monitor the three-phase voltage of the dry-type transformer in real time, when the voltage is overlarge, the control device controls the dry-type transformer to delay for a certain time and then execute the tripping action, so that the relay protection effect is achieved, the overvoltage protection is realized, and the safety degree of the dry-type transformer during working is improved.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the protective scope of the present invention.
Claims (10)
1. A dry-type transformer state monitoring device comprises a shell, and is characterized in that a control device is arranged in the shell, and a display part, a button part, an interface part and a communication part which are respectively and electrically connected with the control device are arranged on the shell; the display part is used for displaying real-time data acquired by the state monitoring device and realizing fault alarm, the button part is used for adjusting working parameters of the state monitoring device, the interface part is used for acquiring the working temperature of the dry-type transformer and realizing the working control of the cooling fan and the dry-type transformer, and the communication part is used for transmitting the data acquired by the state monitoring device to external equipment.
2. A dry-type transformer state monitoring device as claimed in claim 1, wherein the display part comprises a display screen and a plurality of indicator lights respectively electrically connected with the control device, the display screen is used for displaying the real-time data acquired by the state monitoring device, and the indicator lights are used for indicating the working state of the state monitoring device and realizing the working alarm; the button part comprises a plurality of control buttons which are respectively and electrically connected with the control device, and the interface part comprises a plurality of wiring terminals which are respectively and electrically connected with the control device; the communication part comprises a 485 communication interface and an Ethernet interface which are respectively electrically connected with the control device.
3. Dry-type transformer condition monitoring device according to claim 1, characterized in that the housing comprises a base and a panel fixed to the front side of the base, the panel having a cross-sectional area larger than the cross-sectional area of the base; the display part and the button part are respectively arranged on the panel, the interface part and the communication part are respectively arranged at the rear side of the base, radiating fins are respectively arranged at the left side and the right side of the base, one end of each radiating fin is abutted against the panel, and the other end of each radiating fin is detachably connected with the base.
4. The dry-type transformer state monitoring device as claimed in claim 3, wherein a plurality of heat dissipation strips are arranged on one side of the heat dissipation sheet, a stud and one or more positioning blocks are arranged on the other side of the heat dissipation sheet, and a connecting hole and one or more positioning grooves are formed in the base; the connecting hole is connected with the stud in a matched mode, and the positioning block is connected with the positioning groove in a matched mode.
5. A control method of a dry-type transformer state monitoring device, characterized in that the control method is used for realizing the operation control of the dry-type transformer state monitoring device according to any one of claims 1-4, the state monitoring device is respectively connected with a plurality of cooling fans and a temperature sensor through an interface part, and the temperature sensor is used for detecting the winding temperature of the dry-type transformer; the control method comprises the following steps:
presetting the working temperature, the temperature rise amplitude, the over-temperature alarm temperature, the over-temperature tripping temperature and the fan stopping temperature of a fan in a control device in advance;
the control device acquires real-time temperature fed back by the temperature sensor;
when the real-time temperature is more than or equal to the preset working temperature of the fan, the control device controls part of the cooling fan to start working;
when the working temperature of the fan is less than the real-time temperature and less than the overtemperature alarm temperature, and the rising amplitude of the real-time temperature is greater than the preset temperature rising amplitude within a certain time, the control device controls and increases the running frequency of the started cooling fan;
when the real-time temperature is larger than or equal to the preset overtemperature alarm temperature, the control device controls the display part and the communication part to output overtemperature alarm signals and controls the remaining cooling fans to be started, and the control device controls all the fans to work at the preset maximum operation frequency;
when the real-time temperature is larger than or equal to the preset over-temperature tripping temperature, the control device controls the display part and the communication part to output a tripping signal and controls the dry-type transformer to trip.
6. The control method according to claim 5, characterized by further comprising the steps of:
setting a maximum detection temperature and a minimum detection temperature of a state monitoring device in a control device in advance;
the control device acquires real-time temperature fed back by the temperature sensor;
when the real-time temperature is higher than the preset maximum detection temperature or lower than the preset minimum detection temperature, the control device controls the display part and the communication part to output a fault alarm signal.
7. The control method according to claim 5, characterized by further comprising the step of:
when the control device receives a control instruction of the simulation test and the real-time temperature is larger than or equal to the preset over-temperature tripping temperature, the control device controls the display part and the communication part to output a tripping signal, and the dry-type transformer does not execute tripping action.
8. The control method according to claim 5, wherein the control device is capable of obtaining three-phase currents of the dry-type transformer through an interface portion, and the control method further comprises the steps of:
setting a maximum current value in the control device in advance;
the control device obtains three-phase current, and when any phase current is larger than or equal to a preset current maximum value, the control device controls the dry type transformer to delay for a certain time and then execute tripping operation, and controls the communication part and the display part to output tripping signals.
9. The control method according to claim 5, wherein the control device is adapted to obtain a three-phase voltage via an interface portion, the control method further comprising the steps of:
when the three-phase voltage is greater than 80% of rated voltage and the voltage is kept stable for a certain time, the control device controls the display part and the communication part to output information that the dry-type transformer works normally.
10. The control method according to claim 9, characterized by further comprising the step of:
when any phase voltage is less than or equal to the preset low-voltage protection voltage value, the control device controls the dry type transformer to delay for a certain time and then execute tripping action, and controls the communication part and the display part to output tripping signals.
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