CN112283435A - Pressure and temperature integrated monitoring assembly and transformer oil tank pressure and temperature monitoring device - Google Patents
Pressure and temperature integrated monitoring assembly and transformer oil tank pressure and temperature monitoring device Download PDFInfo
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- CN112283435A CN112283435A CN201910678319.2A CN201910678319A CN112283435A CN 112283435 A CN112283435 A CN 112283435A CN 201910678319 A CN201910678319 A CN 201910678319A CN 112283435 A CN112283435 A CN 112283435A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/005—Electrical or magnetic means for measuring fluid parameters
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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
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The invention discloses a pressure and temperature integrated monitoring assembly and a pressure and temperature monitoring device of a transformer oil tank, wherein the pressure and temperature integrated monitoring assembly comprises: the pressure and temperature sensor integrated assembly is arranged on the inner side of the pressure release valve; the pressure and temperature sensor integrated assembly comprises a pressure sensor and a temperature sensor which are integrated into a whole; the controller is electrically connected with the pressure and temperature sensor integrated assembly and comprises an analog-to-digital converter and a display; the analog-to-digital converter is used for respectively performing analog-to-digital conversion on the pressure signal output by the pressure sensor and the temperature signal output by the temperature sensor; the display is used for receiving the pressure signal and the temperature signal after analog-to-digital conversion and displaying the numerical values of the pressure and the temperature. The pressure and temperature integrated monitoring assembly of the oil-immersed power equipment can monitor the temperature and the pressure of the oil tank in real time, is efficient in integration, convenient to install and maintain and low in cost.
Description
Technical Field
The invention relates to the technical field of power equipment detection, in particular to a pressure and temperature integrated monitoring assembly of oil-immersed power equipment and a pressure and temperature monitoring device of a transformer oil tank.
Background
The pressure relief valve of the transformer is used for protecting a pressure protection device of a large and medium oil-immersed transformer, and can prevent an oil tank from deforming and bursting when a fault occurs in the transformer and a large amount of gas is generated. The pressure protection device is internally provided with a signal switch, a normally open contact of the signal switch is closed when the pressure protection device opens oil injection, a pressure release signal is sent to the transformer non-electric quantity protection device, and switches on two sides of the transformer are tripped while an accident signal is sent. The opening pressure of the pressure protection device is 55Kpa (the pressure is 0.6-0.7 times of the safe pressure of the transformer oil tank), and the closing pressure is 34 Kpa. However, the conventional oil-immersed power transformer pressure relief valve generally does not have the capability of monitoring the pressure and temperature of the oil tank in real time.
The prior art proposes a pressure relief valve for a transformer, in which a lower plug cover is hermetically connected with a valve seat flange through an elastic telescopic tube, a sensitive resistor is arranged on the upper part of the upper plug cover and is contacted with a guide rod, the sensitive resistor, a power supply and an ammeter are connected in series to form a loop, the guide rod moves up and down along an axial direction under the action of the pressure in the transformer, and transmits a signal to a circuit part and is displayed by the sensitive ammeter. The scheme determines the relation between the pressure and the display value of the ammeter through the functional relation between the displacement generated by the guide rod and the pressure and the resistance value of the sensitive resistor, so that the measuring range after the pressure and the current value are converted can be marked out, and the pressure in the oil tank can be accurately displayed. However, according to the scheme, the pressure value is determined through the functional relation between the displacement size and the pressure generated by the guide rod and the resistance value of the sensitive resistor, errors are easily generated, so that the oil pressure monitoring is not accurate enough, the internal structure for realizing the pressure calculation of the pressure release valve of the transformer is complex, the cost is high, the effect is poor, and the scheme does not have the function of monitoring the temperature of the oil tank.
Therefore, it is necessary to design a temperature and pressure monitoring assembly and a transformer pressure relief valve which can monitor the pressure and temperature in the oil tank of the transformer in real time during operation and provide an alarm for abnormal pressure as soon as possible to ensure the safe operation of the transformer and have low cost.
Disclosure of Invention
The invention provides a pressure and temperature integrated monitoring assembly of oil-immersed power equipment, which can monitor the temperature and pressure of an oil tank in real time, is efficient in integration, convenient to install and maintain and low in cost. The technical scheme is as follows:
an integrated pressure and temperature monitoring assembly of an oil-immersed power device, comprising:
the pressure and temperature sensor integrated assembly is arranged on the inner side of the pressure release valve; the pressure and temperature sensor integrated assembly comprises a pressure sensor and a temperature sensor which are integrated into a whole;
the controller is electrically connected with the pressure and temperature sensor integrated assembly and comprises an analog-to-digital converter and a display;
the analog-to-digital converter is used for respectively performing analog-to-digital conversion on the pressure signal output by the pressure sensor and the temperature signal output by the temperature sensor;
the display is used for receiving the pressure signal and the temperature signal after analog-to-digital conversion and displaying the numerical values of the pressure and the temperature.
Preferably, pressure, temperature sensor integration component still include the installation department, the installation department can dismantle connect in pressure release valve inboard department, pressure sensor with temperature sensor set up in on the installation department.
Preferably, the range of the pressure sensor is 0-10 Mpa; the measuring range of the temperature sensor is-50 ℃ to 150 ℃.
Preferably, the pressure sensor is a silicon piezoresistive pressure sensor; the temperature sensor adopts a fluorophor optical fiber temperature sensor.
Preferably, the controller further comprises a pressure transmitter and a temperature transmitter; the pressure transmitter is electrically connected with the pressure sensor and is used for converting a pressure signal of 0-10Mpa into a standard current signal of 4-20 mA; the temperature transmitter is electrically connected with the temperature sensor and is used for converting the temperature signal of-50-150 ℃ into a 4-20mA standard current signal.
Preferably, the controller is also electrically connected with a remote control room and is used for uploading 4-20mA standard current signals output by the pressure transmitter and the temperature transmitter to the remote control room.
Preferably, the controller further comprises an RS485 interface, and the RS485 interface is electrically connected to the analog-to-digital converter and is used for uploading the pressure signal and the temperature signal subjected to analog-to-digital conversion to a remote control room.
Preferably, the controller further includes a relay, the relay is electrically connected to the analog-to-digital converter, and is configured to receive the pressure signal and the temperature signal that are subjected to analog-to-digital conversion, and output a corresponding switching value signal when a pressure value reaches a preset pressure threshold value or a temperature value reaches a preset temperature threshold value.
Preferably, the controller still includes pressure alarm and temperature alarm, the pressure alarm with the relay electricity is connected for according to the switching value signal of relay output carries out pressure alarm, the temperature alarm with the relay electricity is connected for according to the switching value signal of relay output carries out temperature alarm.
In order to achieve the purpose, the invention correspondingly provides a device for monitoring the pressure and the temperature of the oil tank of the transformer, which comprises a pressure release valve arranged on the oil tank of the transformer, wherein the inner side of the pressure release valve is provided with the pressure and temperature integrated monitoring assembly of the oil-immersed power equipment.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the integrated assembly of the pressure sensor and the temperature sensor is adopted, so that the key state parameters of the oil pressure and the temperature of the oil-immersed transformer can be accurately monitored in real time, the oil tank is prevented from being deformed or burst due to abnormal temperature and pressure of the oil tank, and the integrated assembly is only required to be installed at the position of a pressure release valve of the transformer, so that the integrated assembly is convenient to install and maintain and low in cost;
2. by adopting the silicon piezoresistive pressure sensor, the oil pressure directly acts on a diaphragm of the silicon piezoresistive pressure sensor, and the sensor can quickly and accurately acquire the pressure state of the oil tank by utilizing the piezoresistive effect; the fluorescent body optical fiber temperature sensor is adopted, and the fluorescent body optical fiber temperature sensor is convenient to be integrated with the pressure sensor into an integrated assembly by utilizing the characteristics of electromagnetic interference resistance, small size, strong insulativity, high precision and the like, and accurately measures the oil temperature state of the oil tank.
Drawings
Fig. 1 is an overall cross-sectional structural view of an oil-immersed power device according to an embodiment of the present invention, in which a pressure and temperature integrated monitoring module is installed at a pressure release location;
fig. 2 is a block diagram of a pressure and temperature integrated monitoring assembly of an oil-immersed power device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an integrated assembly of pressure and temperature sensors in an integrated pressure and temperature monitoring assembly of an oil-immersed power device according to an embodiment of the present invention;
fig. 4 is a schematic wiring diagram of an integrated assembly of pressure and temperature sensors and a controller in an integrated pressure and temperature monitoring assembly of an oil-immersed power device according to an embodiment of the present invention;
fig. 5 is a block diagram of an internal circuit of a silicon piezoresistive pressure sensor in a pressure and temperature integrated monitoring assembly of an oil-immersed power device according to an embodiment of the present invention;
fig. 6 is an application circuit diagram of a silicon piezoresistive pressure sensor in a pressure and temperature integrated monitoring assembly of an oil-immersed power device according to an embodiment of the present invention;
fig. 7 is a fluorescence characteristic graph of a phosphor optical fiber temperature sensor in the pressure and temperature integrated monitoring assembly of the oil-immersed power device according to the embodiment of the present invention;
fig. 8 is a graph showing the temperature of the phosphor optical fiber temperature sensor in the pressure and temperature integrated monitoring assembly of the oil-immersed power device according to the embodiment of the present invention as a function of the fluorescent afterglow.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Referring to fig. 1 to 8, fig. 1 is a structural diagram of an overall cross-section of an oil-immersed power device with a pressure and temperature integrated monitoring module installed at a pressure release location according to an embodiment of the present invention, and fig. 2 is a block diagram of the oil-immersed power device with the pressure and temperature integrated monitoring module according to an embodiment of the present invention. This oily formula power equipment's pressure temperature integrated monitoring subassembly includes: the pressure and temperature sensor integrated assembly 110 is disposed inside the pressure relief valve 200, and the controller 120 is electrically connected to the pressure and temperature sensor integrated assembly 110.
The integrated pressure and temperature sensor assembly 110 includes a pressure sensor 111 and a temperature sensor 112 integrated together.
The controller 120 includes a display 121 and an analog-to-digital converter 122.
The analog-to-digital converter 122 is configured to perform analog-to-digital conversion on the pressure signal output by the pressure sensor 111 and the temperature signal output by the temperature sensor 112 respectively;
the display 121 is configured to receive the pressure signal and the temperature signal after analog-to-digital conversion, and display numerical values of the pressure and the temperature.
In order to solve the problems that the conventional pressure relief valve of an oil-immersed power transformer does not usually have the capability of monitoring the temperature and the pressure of an oil tank in real time, or the provided pressure detection technology is too complex, the measurement accuracy is low, the cost is high, and the like, the embodiment provides a pressure and temperature integrated monitoring assembly of oil-immersed power equipment, which aims to accurately monitor the comprehensive oil temperature, the oil pressure state and the variation trend of the oil-immersed transformer of a transformer substation in real time, reduce the operation cost, improve the maintenance efficiency, and the like, based on the technical purposes, the embodiment integrates a pressure sensor and a temperature sensor in the same assembly, and integrates an analog-to-digital converter for respectively performing analog-to-digital conversion on a pressure signal output by the pressure sensor and a temperature signal output by the temperature sensor in a controller, so that a pressure and temperature integrated sensor and a digital signal output, and the pressure signal and the temperature signal of the oil tank after analog-to-digital conversion are acquired in real time through the display to be displayed in real time, so that a user can conveniently check the temperature and pressure information of the oil tank in real time. The oil pressure and temperature monitoring system has the technical advantages that the multi-parameter sensor is integrated, and the key state parameters of the oil pressure and temperature of the oil immersed transformer can be accurately monitored in real time only by installing the pressure relief valve of the transformer through an integrated design, and a real-time monitoring result is given, so that the aims of high-efficiency integration, convenience in installation and maintenance and cost reduction are fulfilled.
Specifically, in order to realize the on-site monitoring function of the oil temperature and the oil pressure of the transformer tank and prevent the controller from contacting the transformer oil, in this embodiment, the controller 120 and the pressure and temperature sensor integrated component 110 may be connected by a short line, and at least a portion of the pressure and temperature sensor integrated component 110 extends into the pressure release valve 200 from the outside to the inside, and the controller 120 is disposed outside the pressure release valve 200 and close to the pressure and temperature sensor integrated component 110.
Preferably, referring to fig. 3, fig. 3 is a schematic structural diagram of the integrated assembly 110 for pressure and temperature sensors, wherein the integrated assembly 110 for pressure and temperature sensors further includes a mounting portion 113, the mounting portion 113 is detachably connected to the inner side of the pressure release valve 200, and the pressure sensor 111 and the temperature sensor 112 are disposed on the mounting portion 113.
In a specific embodiment of the present embodiment, the mounting portion 113 is designed by a thread, and is screwed with the pressure relief valve 200, so that the pressure relief valve 200 is fixedly mounted on the pressure and temperature sensor integrated component 110, the mounting and dismounting processes are simple, and the maintenance is facilitated when the pressure and temperature sensor integrated component 110 fails.
Further, the pressure sensor 111 is relatively far away from the installation part 113, and the temperature sensor 112 is relatively close to the installation part 113, in other words, the temperature sensor 112 is located between the installation part 113 and the pressure sensor 111, and the pressure and temperature sensor integrated assembly 110 is directly immersed in oil at the inner side of the pressure release valve to measure the temperature and the pressure in real time and is directly applied, so that the measuring method is more convenient and more efficient.
Further, the pressure and temperature sensor integrated assembly 110 of the present embodiment does not use oil well pumps, hoses, batteries, valves, membranes or other easily worn parts that may fail or cause power interruption, and the integrated assembly can be directly immersed in oil products for online real-time measurement, wherein the maximum pressure tolerance of the integrated assembly can reach 20bar, and can withstand wide temperature changes, vibrations and harsh outdoor environments; furthermore, all the electrical connections of the embodiment are designed to be electrically isolated and can withstand short-time power failure, so that the pressure and temperature integrated monitoring assembly of the oil-immersed power equipment can continuously monitor the temperature and pressure state of the transformer oil tank.
Preferably, the range of the pressure sensor 111 is 0-10 Mpa; the range of the temperature sensor 112 is-50 deg.C-150 deg.C.
Referring to fig. 4, fig. 4 is a schematic wiring diagram of the integrated assembly 110 of pressure and temperature sensors and the controller 120, and preferably, the controller 120 further includes a pressure transmitter and a temperature transmitter 123; the pressure transmitter is electrically connected with the pressure sensor and is used for converting a pressure signal a of 0-10Mpa into a standard current signal of 4-20 mA; the temperature transmitter is electrically connected with the temperature sensor and is used for converting a temperature signal b of-50-150 ℃ into a 4-20mA standard current signal.
Specifically, the pressure transmitter and the temperature transmitter 123 can be integrated into the controller, wherein the pressure transmitter can convert a pressure signal of 0-10Mpa into a standard current signal of 4-20mA, and the temperature transmitter can convert a temperature signal of-50 ℃ -150 ℃ into a standard current signal of 4-20 mA.
Preferably, the controller 120 is also electrically connected to the remote control room 300 for uploading the 4-20mA standard current signals outputted from the pressure transmitter and the temperature transmitter 123 to the remote control room 300.
Preferably, the controller further comprises an RS485 interface 124, wherein the RS485 interface 124 is electrically connected to the analog-to-digital converter 122, and is used for uploading the analog-to-digital converted pressure signal and temperature signal (i.e. digital signal) to the remote control room 300.
In this embodiment, the pressure signal output by the pressure sensor 111 and the temperature signal output by the temperature sensor 112 are transmitted to the controller 120 on line and in real time, and the controller 120 installed on the local component cabinet or the back panel cabinet is connected to an AC220V power supply 125, and the pressure transmitter and the temperature transmitter 123 in the controller 120 convert the received pressure and temperature signals (i.e., primary electrical signals) into standard electrical signals of 4-20mA, which can be directly output to the remote control room 300, or converted into digital signals by the analog-to-digital converter 122, and then uploaded to the remote control room 300 in the form of RS485 signals by the RS485 interface 124 for remote monitoring and measurement.
The pressure and temperature integrated monitoring assembly of the present embodiment transmits the pressure and temperature information in the pressure relief valve 200 to the remote control room 300 through the RS485 communication interface 124 in the controller 120 and the signal output ports of the pressure transmitter and the temperature transmitter 123, and outputs the pressure and temperature information to the remote control room 300 through two different signals (analog signal and digital signal), so that the remote control room 300 manages and records the temperature information and the pressure information of the electrical equipment. The remote control room 300 serves as a background control center of the power equipment, and after receiving the pressure signal and the temperature signal, the remote control room displays and records the pressure signal and the temperature signal in real time, and a worker of the remote control room 300 can monitor the oil temperature field state and the historical state of the power equipment in real time so as to perform corresponding overall control operation.
Preferably, a relay 126 is disposed in the controller 120, and the relay 126 is electrically connected to the analog-to-digital converter 122, and is configured to receive the pressure signal and the temperature signal after analog-to-digital conversion, and output a corresponding switching value signal when a pressure value reaches a preset pressure threshold value or a temperature value reaches a preset temperature threshold value.
In this embodiment, the controller 120 may set the limit values of the pressure and the temperature according to the actual requirement of the transformer as the object to be monitored, and output (limit) the switching value signal through the built-in relay 123, thereby completing the logic processing of the non-electric quantity in the power transmission and transformation line. Specifically, the switching value signal is an open/close signal of the relay switch, wherein the relay switch can be closed and the switching value signal is output to the remote control room 300, the pressure alarm 127 and the temperature alarm 128 when the pressure value reaches a preset pressure threshold value or the temperature value reaches a preset temperature threshold value, wherein the preset temperature threshold value is set between 45 ℃ and 105 ℃ according to different transformer performances, the preset pressure threshold value is set between 55kpa and 70kpa according to different transformer performances, and when the corresponding temperature value or/and the pressure value of the transformer tank reaches the corresponding threshold value, the switch is closed and the switching value signal is output to the temperature alarm or the pressure alarm and the remote control room, so that the remote control room and the transformer simultaneously sound an alarm on site, and the operation safety of the transformer is ensured.
Preferably, the controller 120 further comprises a pressure alarm 127 and a temperature alarm 128, wherein the pressure alarm 127 is electrically connected with the relay 126 and is used for giving a pressure alarm according to the switching value signal output by the relay, and the temperature alarm 128 is electrically connected with the relay 126 and is used for giving a temperature alarm according to the switching value signal output by the relay.
In this embodiment, the controller can display the temperature and pressure information of the oil tank in real time, when the pressure of the transformer oil tank reaches a preset pressure threshold, the relay outputs a switching value signal to the pressure alarm to sound the pressure alarm, and when the temperature of the transformer oil tank reaches a preset temperature threshold, the relay outputs a switching value signal to the temperature alarm to sound the temperature alarm, so as to send out on-site alarm information, and the switching value signal can also be remotely transmitted to the remote control room, so as to send out an alarm in the remote control room. Furthermore, the remote control room can be provided with a pressure alarm and a temperature alarm, and after receiving the corresponding switching value signal output by the relay, the remote control room sends out an alarm signal in due time.
Preferably, the pressure sensor 111 is a silicon piezoresistive pressure sensor;
in this embodiment, the working principle of the pressure sensor is that pressure directly acts on a diaphragm of the silicon piezoresistive pressure sensor, the sensor is made of silicon single crystal material, and by virtue of the phenomenon that resistivity changes under the action of external force (piezoresistive effect principle), whether the sensor is under pressure or not can be detected, and the changed resistance value is in direct proportion corresponding relation with the received pressure, and the pressure transmitter in this embodiment is utilized to convert and output a standard current signal corresponding to the pressure, so that the problems that when a common pressure sensor is applied to a pressure release valve to measure the oil pressure of an oil tank, the body size is too large, the oil pressure is inaccurate to measure, integration is difficult to realize, and the like are at least solved, please refer to fig. 5-6, fig. 5 is a circuit diagram inside the silicon piezoresistive pressure sensor, and fig. 6 is an application circuit diagram of the silicon piezoresistive pressure sensor.
Particularly, can adopt 50 type pressure sensor, it is for adopting TO-5 nickel metal technology packaging structure's silicon piezoresistive pressure sensor, adopts and does not have the drawing pressure pipe design, and pressure direct action adopts absolute pressure type pressure sensor at the sensor top, and the range scope is from 0 ~ 5PSI TO 0 ~ 500PSI, adopts the structural design of pressure medium around the chip, can be applied TO transformer insulating liquid, makes its oil pressure information of real-time detection when acting on pressure release valve inboard more accurate, high-efficient.
Preferably, the temperature sensor 112 is a phosphor fiber temperature sensor.
The fluorophor optical fiber temperature sensor has the characteristics of electromagnetic interference resistance, stability, reliability, small size, high precision, long service life, good insulativity and the like, and is designed by utilizing the temperature characteristic of fluorescent radiation of phosphide: the micro rare earth phosphorus compound arranged at one end of the optical fiber is excited to fluoresce after being irradiated by ultraviolet pulse light, the time length of the fluorescent afterglow can change along with the temperature change and become a function of the temperature, and thus the measured temperature is calculated, the temperature measuring range of the temperature sensing device of the embodiment is-50 ℃ to +150 ℃, the precision can reach +/-0.5 +/-1.0 ℃, and the sampling frequency is 25 Hz. By utilizing the characteristics, the fluorophor optical fiber temperature sensor and the silicon piezoresistive pressure sensor can be combined to form an integrated temperature and pressure monitoring assembly, the monitoring assembly has small volume and strong applicability, and can achieve the technical purposes of accurately detecting the real-time temperature and pressure state of an oil tank, saving cost and improving operability, please refer to fig. 7-8, wherein fig. 7 is a fluorescence characteristic curve, and fig. 8 is a function corresponding curve between the integral of fluorescence afterglow in time (namely the service life of the fluorescence afterglow) and the temperature.
In the embodiment, the silicon piezoresistive pressure sensor and the fluorescent body optical fiber temperature sensor which are integrated into a whole are arranged on the inner side of the pressure release valve of the traditional transformer, an optimized structure is adopted, a pressure transmitter is utilized to convert a pressure signal of 0-10Mpa into an output current signal of 4-20mA, and converting the temperature signal of-50-150 ℃ into a 4-20mA standard current signal by using a temperature transmitter, by directly applying the silicon piezoresistive pressure and fluorescent body optical fiber temperature sensor integrated with the silicon piezoresistive pressure and fluorescent body optical fiber temperature sensor at the pressure release valve, the oil pressure and temperature numerical values at the pressure release valve can be directly displayed on a display of a controller in real time, and 4-20mA standard electric signals can be remotely transmitted to a remote control room, the pressure and temperature monitoring device is used for monitoring the pressure and temperature in the transformer oil tank in real time, and can also integrate the alarm function of overhigh oil pressure and oil temperature.
According to the pressure and temperature integrated monitoring assembly of the oil-immersed power equipment, the pressure sensor and the temperature sensor are integrated into a whole, the pressure sensor and the temperature sensor only need to be installed at the position of the pressure release valve of the transformer, the sensor integrated assembly can be directly immersed into an oil product to accurately monitor key state parameters of the oil pressure and the temperature of the oil-immersed power equipment in real time, and further, the purposes of high-efficiency integration, convenience in installation and maintenance and cost reduction are achieved through real-time display and control of the controller; the integrated sensor assembly adopts a silicon piezoresistive pressure sensor and a phosphor optical fiber temperature sensor, so that the oil pressure directly acts on a diaphragm of the silicon piezoresistive pressure sensor, and the pressure state of an oil tank can be quickly and accurately acquired by using the piezoresistive effect sensor; the fluorophor optical fiber temperature sensor is convenient to be integrated with the pressure sensor into an integrated assembly by utilizing the characteristics of electromagnetic interference resistance, small size, strong insulativity, high precision and the like, and accurately measures the oil temperature state of the oil tank.
Based on the pressure and temperature integrated monitoring assembly of the oil-immersed power equipment disclosed by the embodiment, please refer to fig. 1, this embodiment correspondingly discloses a pressure and temperature monitoring device of a transformer oil tank, the pressure and temperature monitoring device of the transformer oil tank comprises a pressure release valve arranged on the transformer oil tank, and the pressure and temperature integrated monitoring assembly of the oil-immersed power equipment is arranged on the inner side of the pressure release valve.
Preferably, as shown in fig. 1, the pressure relief valve 200 includes a valve body 210, a valve seat 240, a valve rod 250 and a valve cover 260, the valve seat 240 is disposed at the lower end of the valve body 210, a valve disc 270 is disposed at the upper end of the valve body, the valve disc 270 is connected to the lower end of the valve rod 250, an oil drain 220 is disposed on the valve body, a spring 280 is mounted outside the valve rod 250, the valve rod 250 extends upward from the position of the valve disc 270 to the top end of the valve cover 260, and an oil inlet 230 is disposed between the valve disc 270 and the valve seat 240.
The pressure relief valve of this embodiment is installed on the transformer upper cover, and through the combination and the connection of above-mentioned structure, its main theory of operation is as follows: the pressure in the oil tank drives the valve disc to drive the guide rod to move upwards, the lower plug cover also moves upwards simultaneously under the action of the elastic telescopic pipe, when the internal pressure of the transformer reaches a preset value, the elastic telescopic pipe does not extend any more, a gap appears between the valve disc and the valve seat, the oil inlet and the oil drainage opening are communicated to open pressure relief, optionally, a sealing ring can be arranged between the valve disc and the valve seat, and the pressure relief is opened when the gap appears between the valve disc and the sealing ring.
Preferably, a spring adjusting pressure plate 290 is further disposed at the lower side of the valve cap 260, and is connected to one end of the spring 280, and the valve rod 250 passes through the spring adjusting pressure plate 290.
Preferably, the upper end of the valve rod 250 is also provided with a stroke switch 2A 0.
The travel switch utilizes the collision of a mechanical motion part to make a contact of the mechanical motion part act to realize the connection or disconnection of a control circuit, thereby achieving a certain control purpose. In the embodiment, the position of mechanical movement of the valve rod is limited by arranging the travel switch at the upper end of the valve rod, so that the mechanical movement of the valve rod moves in a certain position and the like, thereby achieving the pressure release effect of the transformer release valve in a preset pressure range.
Preferably, the valve body 230 is externally provided with a valve cover 2B 0. In order to prevent the pressure relief valve from rusting, the present embodiment is provided with a valve cover outside the valve body.
Preferably, the valve housing 2B0 is provided with an outlet hole 2C0, and a junction box 2D0 is mounted in a preset range along the outlet hole 2C 0. In the embodiment, the wire outlet hole is formed in the valve cover, the electric wire in the pressure release valve is led into the junction box through the wire outlet hole, and the junction box is arranged on the valve cover and outwards extends to the preset range along the wire outlet hole, so that the pressure release valve is still in a closed state under the protection of the valve cover.
Preferably, the valve seat 240 is provided with a threaded aperture (not shown), and the integrated pressure and temperature monitoring assembly 100 of the oil-filled power device is installed inside the pressure relief valve 200 through the threaded aperture.
This embodiment can be with the installation department phase-match of pressure, the integrated subassembly of temperature sensor integration in the pressure temperature integrated monitoring subassembly of oily formula power equipment through this screw thread aperture on the disk seat, and the pressure temperature integrated monitoring subassembly of oily formula power equipment is installed fixedly or is dismantled the maintenance through this screw thread aperture, and its is easy and simple to handle, swift, practices thrift the cost simultaneously.
Preferably, the valve seat 240 is mounted on the upper cover 2E0 of the transformer tank by screws.
Preferably, the valve cover 260 comprises a valve cover top seat, the upper end of the valve rod penetrates through the valve cover top seat, and a rain cover 2F0 is arranged above the valve cover top seat. This embodiment is through setting up rain-proof cover in valve gap footstock top, effectively prevents damp to the pressure relief valve.
The difference that transformer tank pressure and temperature monitoring device that this embodiment provided exists with prior art at least lies in, and the pressure temperature integrated monitoring subassembly is installed to transformer pressure relief valve inboard, and this pressure temperature integrated monitoring subassembly can directly immerse in the oil, pressure and temperature information in the real-time supervision transformer tank, and show and control, can protect the transformer tank in real time to prevent the transformer because of insulating or other abnormal fault so the electric power accident that causes.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides an integrated monitoring subassembly of pressure temperature of oily formula power equipment which characterized in that includes:
the pressure and temperature sensor integrated assembly is arranged on the inner side of the pressure release valve; the pressure and temperature sensor integrated assembly comprises a pressure sensor and a temperature sensor which are integrated into a whole;
the controller is electrically connected with the pressure and temperature sensor integrated assembly and comprises an analog-to-digital converter and a display;
the analog-to-digital converter is used for respectively performing analog-to-digital conversion on the pressure signal output by the pressure sensor and the temperature signal output by the temperature sensor;
the display is used for receiving the pressure signal and the temperature signal after analog-to-digital conversion and displaying the numerical values of the pressure and the temperature.
2. The integrated pressure and temperature monitoring assembly of the oil-filled power equipment according to claim 1, wherein the integrated pressure and temperature sensor assembly further comprises an installation part, the installation part is detachably connected to the inner side of the pressure release valve, and the pressure sensor and the temperature sensor are arranged on the installation part.
3. The integrated pressure and temperature monitoring assembly of the oil filled power device of claim 1, wherein:
the measuring range of the pressure sensor is 0-10 Mpa;
the measuring range of the temperature sensor is-50 ℃ to 150 ℃.
4. The integrated pressure and temperature monitoring assembly of the oil filled power device according to claim 3, wherein:
the pressure sensor adopts a silicon piezoresistive pressure sensor;
the temperature sensor adopts a fluorophor optical fiber temperature sensor.
5. The integrated pressure and temperature monitoring assembly of the oil filled power device according to claim 3, wherein: the controller also comprises a pressure transmitter and a temperature transmitter;
the pressure transmitter is electrically connected with the pressure sensor and is used for converting a pressure signal of 0-10Mpa into a standard current signal of 4-20 mA;
the temperature transmitter is electrically connected with the temperature sensor and is used for converting the temperature signal of-50-150 ℃ into a 4-20mA standard current signal.
6. The integrated pressure and temperature monitoring assembly of oil-filled power equipment according to claim 5, wherein the controller is further electrically connected with a remote control room and is used for uploading a 4-20mA standard current signal output by the pressure transmitter and the temperature transmitter to the remote control room.
7. The integrated pressure and temperature monitoring assembly of the oil-filled power device according to claim 1, wherein the controller further comprises an RS485 interface, and the RS485 interface is electrically connected with the analog-to-digital converter and is used for uploading the analog-to-digital converted pressure signal and temperature signal to a remote control room.
8. The integrated pressure and temperature monitoring assembly of the oil-filled power device according to claim 1, wherein the controller further comprises a relay, the relay is electrically connected to the analog-to-digital converter, and is configured to receive the analog-to-digital converted pressure signal and temperature signal and output a corresponding switching value signal when a pressure value reaches a preset pressure threshold value or a temperature value reaches a preset temperature threshold value.
9. The integrated pressure and temperature monitoring assembly of oil-filled power equipment according to claim 8, wherein the controller further comprises a pressure alarm and a temperature alarm, the pressure alarm is electrically connected with the relay and used for giving a pressure alarm according to the switching value signal output by the relay, and the temperature alarm is electrically connected with the relay and used for giving a temperature alarm according to the switching value signal output by the relay.
10. A pressure and temperature monitoring device for a transformer oil tank comprises a pressure relief valve arranged on the transformer oil tank, and is characterized in that the pressure and temperature integrated monitoring assembly of the oil-immersed power equipment as claimed in any one of claims 1 to 9 is arranged on the inner side of the pressure relief valve.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115899339A (en) * | 2023-03-10 | 2023-04-04 | 成都凯天电子股份有限公司 | Reverse-arch type optical fiber rupture disk |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115899339A (en) * | 2023-03-10 | 2023-04-04 | 成都凯天电子股份有限公司 | Reverse-arch type optical fiber rupture disk |
| CN115899339B (en) * | 2023-03-10 | 2023-05-26 | 成都凯天电子股份有限公司 | Inverted arch type optical fiber rupture disk |
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