Oil state multi-parameter online monitoring device of oil charging equipment and oil charging equipment thereof

Abstract

The invention provides an oil charging equipment oil state multi-parameter online monitoring device and oil charging equipment thereof, and relates to the technical field of oil online monitoring devices. A sensor probe is characterized in that an inner cavity for accommodating a chip assembly and a sensor shell are formed in a sensor connector, and a circuit board assembly is fixedly mounted in the shell; the flexible connector is arranged between the sensor probe and the sensor shell and flexibly connects the sensor probe and the sensor shell, so that the sensor probe is bent in all directions relative to the sensor shell; wherein the chip assembly integrates a palladium membrane sensor, a pressure sensor, a temperature sensor and a micro-water sensor, safe and accurate online monitoring of oil state parameters of the oil-filled equipment is achieved in multiple dimensions, and more accurate parameters can be obtained; according to the invention, the sensor probe and the sensor shell are connected by adopting the omni-directional bending flexible connection, so that the installation process of the device is more flexible, and the requirement on the overall installation precision of the device is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of oil online monitoring devices, in particular to an oil filling equipment oil state multi-parameter online monitoring device and the oil filling equipment. Background Art

[0002] Power transformers are important equipment in the power grid. Aging, high load levels and network faults can cause transformer damage, increasing the risk of unexpected failures and power outages. Hydrogen content and its rate of change can reflect the severity of the fault state, and moisture can have a direct impact on the life of the transformer. In addition, moisture in the oil has an important impact on the condition of transformer cellulose and the insulating ability of the oil. Continuous monitoring of hydrogen and water content using probes installed in situ locations such as oil taps is a preventive maintenance measure to extend the life of the transformer.

[0003] In order to solve the above problems, online monitoring devices for dissolved gas in oil of oil-filled equipment have appeared on the market. Such devices only have a single hydrogen content detection function. Although hydrogen content is the main basis for judging internal faults of oil-filled equipment, a single indicator is far from enough for operators to judge the type and degree of equipment faults. It is necessary to select other state quantities to comprehensively characterize the internal state of oil-filled equipment.

[0004] To this end, a moisture, hydrogen content and temperature transmitter suitable for online monitoring of transformer status is disclosed in the prior art with publication number "CN105318915B", including an electrical box, a long detection tube sealed and connected to the electrical box, an installation adapter joint sleeved on the long detection tube, and a sensor core insulation packaging unit arranged in the detection part of the long detection tube; the sensor core insulation packaging unit includes an upper insulation card, a lower insulation card, a flexible circuit board, a hydrogen sensitive core and a temperature and humidity sensor, and an insulation sealing step; the moisture, hydrogen content and temperature transmitter also includes a flexible circuit guide tape, which improves the measurement accuracy of the moisture, hydrogen content and temperature transmitter, and the adjustable installation adapter joint enables the installation depth of the detection part to adapt to various transformer valve bodies. The temperature and humidity sensor can extend out of the oil hole area if special requirements are met, and the hydrogen sensitive core is located in the oil hole area. This design can quickly and reliably detect water content fluctuations while avoiding interference with the temperature control of the hydrogen sensitive core.

[0005] However, the above-mentioned device still has obvious defects during use: the detection probe of the device adopts a straight tube setting, which makes it have high requirements on installation accuracy and the adjustment process is not flexible enough. At the same time, the detection parameters of the above-mentioned device are limited, which makes it not conducive to making a more accurate judgment on the state of the oil, and thus leads to distortion of the final detection judgment. Summary of the invention

[0006] The purpose of the present invention is to provide an oil filling equipment oil state multi-parameter online monitoring device and oil filling equipment thereof, so as to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An oil state multi-parameter online monitoring device for oil-filled equipment, comprising:

[0009] The sensor probe is composed of a sensor connector, a chip assembly, a wiring terminal and a probe rod. The sensor connector is provided with an inner cavity for accommodating the chip assembly. The chip assembly is electrically plugged into the wiring terminal. The probe rod is arranged on a side of the sensor connector away from the chip assembly.

[0010] A sensor housing, the sensor housing comprising a housing, a circuit board assembly and an electrical connector, the circuit board assembly being fixedly mounted in the housing, the circuit board assembly being electrically connected to a terminal block in a sensor probe, the electrical connector being fixedly mounted on the housing, one end of the electrical connector being electrically connected to the circuit board assembly, and the other end of the electrical connector being connected to a communication cable for supplying power to the sensor probe and electrical components installed in the sensor housing, and outputting signals to the outside;

[0011] A flexible connection is provided between the sensor probe and the sensor housing and flexibly connects the two so that the sensor probe can be omnidirectionally bent relative to the sensor housing; wherein,

[0012] The chip assembly integrates a palladium film sensor, a pressure sensor, a temperature sensor and a micro-water sensor.

[0013] Preferably, the flexible connection includes a bellows connector, a metal bellows, a transition connection cable and a shell connector, wherein the bellows connector is plug-in-fitted with the probe rod, the shell connector is plug-in-fitted with the outer shell, and the terminal block is electrically connected to the circuit board assembly through the transition connection cable.

[0014] Preferably, the sensor connector is provided with threads and a sealing gasket, the sensor connector is sealed and connected to the oil outlet via an adapter, the sensor connector is immersed in oil, and the oil contacts the chip assembly to complete multi-parameter online monitoring.

[0015] Preferably, the housing is also provided with a rain cover at the plug-in position of the electrical connector.

[0016] Preferably, magnetic seats are fixedly mounted at the four corners of the bottom of the housing, and the sensor housing is adsorbed onto the oil-filling device through the magnetic seats.

[0017] Preferably, the circuit board assembly consists of an acquisition circuit, an AD amplification power unit, a data conversion power unit and an MCU operation unit.

[0018] An oil filling device, the oil filling device also includes the above-mentioned multi-parameter online monitoring device for oil status of the oil filling device.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention solves the singleness of oil filling equipment monitoring, integrates four state parameters of trace water, oil temperature, oil pressure, and dissolved hydrogen content in oil, and realizes safe and accurate online monitoring of oil state parameters of oil filling equipment in multiple dimensions. Compared with a single detection method, more accurate parameters can be obtained and the risk of oil leakage from the adapter is greatly reduced. The present invention adopts an omnidirectionally curved soft connection to connect the sensor probe and the sensor housing, thereby making the installation process of the device more flexible and greatly reducing the overall installation accuracy requirements of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0022] Figure 2 It is a schematic top view of the overall structure of the present invention;

[0023] Figure 3 This is a hardware architecture diagram of the monitoring component of the present invention.

[0024] In the figure: 101 sensor connector, 102 chip assembly, 103 terminal block, 104 probe rod, 105 housing, 106 circuit board assembly, 107 electrical connector, 108 communication cable, 109 bellows connector, 110 metal bellows, 111 transition connection cable, 112 housing connector, 113 rain cover, 114 magnetic seat. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-3 , the present invention provides a technical solution:

[0027] Embodiment 1:

[0028] An oil state multi-parameter online monitoring device for oil-filled equipment, comprising:

[0029] The sensor probe is composed of a sensor connector 101, a chip assembly 102, a wiring terminal 103 and a probe rod 104. The sensor connector 101 is provided with an inner cavity for accommodating the chip assembly 102. The chip assembly 102 is electrically plugged with the wiring terminal 103. The probe rod 104 is arranged on the side of the sensor connector 101 away from the chip assembly 102.

[0030] The sensor housing includes a housing 105, a circuit board assembly 106 and an electrical connector 107. The circuit board assembly 106 is fixedly installed in the housing 105. The circuit board assembly 106 is electrically connected to the wiring terminal 103 in the sensor probe. The electrical connector 107 is fixedly installed on the housing 105, one end of which is electrically connected to the circuit board assembly 106, and the other end of which is connected to the communication cable 108 to supply power to the sensor probe and the electrical components installed in the sensor housing, and output signals to the outside;

[0031] A flexible connection is provided between the sensor probe and the sensor housing and flexibly connects the two so that the sensor probe can be omnidirectionally bent relative to the sensor housing; wherein,

[0032] The chip assembly 102 integrates a palladium film sensor, a pressure sensor, a temperature sensor and a micro-water sensor.

[0033] In this embodiment, the sensor probe and the sensor housing are connected by a flexible connection, which allows the sensor probe to be adjusted more flexibly. The flexible connection includes a bellows connector 109, a metal bellows 110, a transition connection cable 111 and a housing connector 112, wherein the bellows connector 109 is plug-in matched with the probe rod 104, the housing connector 112 is plug-in matched with the housing 105, and the terminal 103 is electrically connected to the circuit board assembly 106 through the transition connection cable 111, the metal bellows 110 can be bent 360° at will, and the internal transition connection cable 111 can be electromagnetically protected and waterproof. Protection, to ensure flexible installation on site, the above devices are mostly connected by detachable plug-in connection, because the device is installed at the oil inlet of the oil filling equipment, which is relatively narrow and has certain requirements for the load capacity and the volume of the detection device, so a split structure design is adopted to greatly reduce the weight and volume of the sensor probe, and avoid the risk of oil inlet breakage or oil leakage caused by excessive load during operation of the oil filling equipment. The chip component 102 integrates a palladium film sensor, a pressure sensor, a temperature sensor and a micro-water sensor. Among them, the prior art mostly adopts multi-component online monitoring technology, through oil flow circulation, oil and gas separation technology to achieve online monitoring of dissolved gas in the oil of the oil filling equipment. The oil and gas separation time of this technology is relatively long, and the hydrogen content in the oil cannot be monitored in real time; second, electrochemical, catalytic combustion and other sensors are used to achieve online monitoring of dissolved hydrogen in the oil.The sensor of this technology is easily interfered by other gases, which affects the test accuracy of the sensor. In addition, the sensor is in contact with oil, resulting in an extremely short lifespan. In order to solve this problem, a palladium film sensor is used as a detection mechanism for the hydrogen content in the oil in this embodiment. The specific catalytic effect of metal palladium on H2 is used to decompose H2 molecules into H atoms, which dissolve and diffuse into the metal palladium film lattice, thereby causing a change in the resistivity of the palladium metal film to achieve the detection of hydrogen concentration. This sensor has simple process, low cost, high sensitivity, and short response time. The sensor can be directly inserted into the oil for measurement without oil and gas separation. In this embodiment, Haizhuo Sys Technology is selected The MODEL3000 series palladium alloy thin film hydrogen sensor produced by the company is a palladium film sensor. The sensor is water-resistant and oil-resistant, and can work in an environment without oxygen. Its accuracy is ±1%. Although the hydrogen content is used as the main basis for determining the internal fault of the oil filling equipment, a single indicator is far from enough for the operation and inspection personnel to determine the type and degree of equipment failure. It is necessary to select other state quantities to comprehensively characterize the internal state of the oil filling equipment. For this reason, the chip component 102 in this embodiment integrates a palladium film sensor, a pressure sensor, a temperature sensor and a micro-water sensor. The pressure sensor and the temperature sensor are Sensors are more common in real life and can be flexibly selected according to the design size of the device. The specific models will not be described here. In addition, the micro-water sensor uses the EE360 series oil trace moisture sensor produced by EE Yijiayi. This sensor can quickly and accurately detect the moisture content in the oil. From a large number of equipment failure reports, it can be known that when the core, winding or insulation paper fails, the internal pressure mutation caused by gas production is relatively prominent, and the pressure sensor has a higher sensitivity than the single hydrogen sensor. Therefore, it can provide equipment abnormality alarms to the operating personnel in the first time. The temperature index can also determine whether the pressure change is Due to thermal expansion and contraction, the micro-water index can determine the insulation state of the equipment, promptly discover problems with the insulating medium, and predict the occurrence of oil-filled equipment failures. In summary, the combination of the above-mentioned multiple sensors not only makes the detection index values ​​richer, but also can make a comprehensive assessment of the device failure through the degree of correlation between the data indicators, thereby overcoming the misjudgment caused by a single parameter in the prior art. In addition, the circuit board assembly 106 is composed of an acquisition circuit, an AD amplification power unit, a data conversion power unit and an MCU operation unit. Through the above-mentioned modules, the collected models can be integrated and transmitted externally.

[0034] Embodiment 2:

[0035] The sensor connector 101 is provided with threads and a sealing gasket. The sensor connector 101 is sealed and connected to the oil outlet through an adapter. The sensor connector 101 is immersed in oil, and the oil contacts the chip assembly 102 to complete multi-parameter online monitoring.

[0036] This embodiment further discloses a connection method at the joint of the sensor connector 101 , and the threaded sealing connection can further ensure the sealing performance, thereby preventing oil leakage.

[0037] Embodiment three:

[0038] The housing 105 is also provided with a rain cover 113 at the insertion position of the electrical connector 107 .

[0039] Magnetic seats 114 are also fixedly installed at the four corners of the bottom of the housing 105, and the sensor housing is adsorbed on the oil-filled device through the magnetic seats 114.

[0040] In this embodiment, an auxiliary structure connected to the housing 105 is further disclosed. By providing a rain cover 113 and a magnetic seat 114, the electrical connector 107 can be protected and the device can be quickly fixed by magnetic attraction, thereby improving installation efficiency.

[0041] An oil filling device, the oil filling device also includes the above-mentioned multi-parameter online monitoring device for oil status of the oil filling device.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-parameter online monitoring device for oil status of oil-filled equipment, characterized in that: include: The sensor probe is composed of a sensor connector, a chip assembly, a wiring terminal and a probe rod. The sensor connector is provided with an inner cavity for accommodating the chip assembly. The chip assembly is electrically plugged into the wiring terminal. The probe rod is arranged on a side of the sensor connector away from the chip assembly. A sensor housing, the sensor housing comprising a housing, a circuit board assembly and an electrical connector, the circuit board assembly being fixedly mounted in the housing, the circuit board assembly being electrically connected to a terminal block in a sensor probe, the electrical connector being fixedly mounted on the housing, one end of the electrical connector being electrically connected to the circuit board assembly, and the other end of the electrical connector being connected to a communication cable for supplying power to the sensor probe and electrical components installed in the sensor housing, and outputting signals to the outside; A flexible connection is provided between the sensor probe and the sensor housing and flexibly connects the two so that the sensor probe can be omnidirectionally bent relative to the sensor housing; wherein, The chip assembly integrates a palladium film sensor, a pressure sensor, a temperature sensor and a micro-water sensor.

2. The multi-parameter online monitoring device for oil status of oil-filled equipment according to claim 1, characterized in that: The flexible connection includes a bellows connector, a metal bellows, a transition connection cable and a shell connector, wherein the bellows connector is plug-in-matched with the probe rod, the shell connector is plug-in-matched with the shell, and the terminal block is electrically connected to the circuit board assembly through the transition connection cable.

3. A multi-parameter online monitoring device for oil status of oil-filled equipment according to claim 1 or 2, characterized in that: The sensor connector is provided with threads and a sealing gasket, and the sensor connector is sealed and connected to the oil outlet through an adapter. The sensor connector is immersed in oil, and the oil contacts the chip assembly to complete multi-parameter online monitoring.

4. The multi-parameter online monitoring device for oil status of oil-filled equipment according to claim 3, characterized in that: The shell is also equipped with a rain cover at the plugging position of the electrical connector.

5. The multi-parameter online monitoring device for oil status of oil-filled equipment according to claim 4, characterized in that: Magnetic seats are also fixedly installed at the four corners of the bottom of the shell, and the sensor housing is adsorbed on the oil-filled device through the magnetic seats.

6. The multi-parameter online monitoring device for oil status of oil-filled equipment according to claim 5, characterized in that: The circuit board assembly consists of an acquisition circuit, an AD amplification power unit, a data conversion power unit and an MCU operation unit.

7. An oil filling device, characterized in that: The oil filling equipment also includes the multi-parameter online monitoring device for oil status of the oil filling equipment as described in any one of claims 1-6.

Images