CN108051032A - The on-line monitoring system of the few oily equipment of substation - Google Patents

Abstract

The invention discloses an online monitoring system for oil-less equipment in substations, which can monitor the oil pressure, temperature and hydrogen content of oil-less equipment such as voltage transformers, oil-less circuit breakers, and (insulation) bushings in real time, and detect defects immediately , the monitoring effect is reliable and comprehensive, and the structure of the original equipment body does not need to be damaged; at the same time, it also has a very convenient oil sample collection structure. The invention comprises a tee installed on the oil discharge port; an inlet of the tee is connected with the oil discharge port, and monitoring sensors and down-conducting sampling pipes are respectively installed on the two outlets of the tee; the monitoring sensor The center of the bottom cover is provided with a threaded mounting head for assembling on an outlet of the tee; the inside of the housing is sequentially provided with a pressure transmitter mounting block for fixing on the bottom cover and a mounting block for A hydrogen sensor fixed on the pressure transmitter installation block, the pressure transmitter installation block is installed with a pressure transmitter.

Description

On-Line Monitoring System of Substation Oil-Less Equipment

technical field

The invention relates to a monitoring technology for oil-less equipment in a substation, and is specifically used for monitoring the oil state of the oil-less equipment in a substation.

Background technique

Substation oil-less equipment such as transformers and reactors is one of the main equipment in the power system and plays a pivotal role in the power system. With the popularization of oil-less equipment technology, voltage transformers, oil-less circuit breakers, (insulation) bushings and other oil-less equipment are one of the important accessories of transformers and reactors, and their reliability directly affects the safe operation of transformers and reactors. In 2017, three abnormal incidents of 750 kV high-voltage bushing failures occurred in Xinjiang Power Grid. Due to timely discovery, no major power grid accidents were caused, otherwise the consequences would be disastrous. Therefore, it is imminent to carry out online monitoring of oil-less equipment. Due to the particularity of the structure of oil-less equipment, there are almost no effective live detection or online monitoring methods for oil-less equipment at present. The current detection and monitoring are limited to regularly discharging oil samples at the sampling valve position of the oil outlet of the oil-less equipment. Detection; if a simple and effective online monitoring method can be adopted to detect defects in time before casing failures and take effective measures, major accidents will be avoided. Oil-impregnated paper insulating bushings will decompose the oil and paper to generate gas when there is a discharge or thermal failure inside the bushing. When the gas exceeds the solubility of the oil, the fault gas will accumulate at the oil conservator at the bushing head, causing the The pressure inside the tube increases;

After our analysis, the important parameters of the state operation of the current oil-less equipment include oil temperature, oil pressure and dissolved hydrogen; generally, there are too few monitoring technologies for dissolved hydrogen, so the theoretical idea is to find a way to collect oil temperature and oil pressure , the change of oil temperature and oil pressure will bring about the change of the final operating parameters, which can immediately detect potential safety hazards.

Contents of the invention

The technical problem to be solved by the present invention is to provide an online monitoring system for substation oil-reducing equipment, which can monitor voltage transformers, oil-reducing circuit breakers, (insulating) bushings, etc. The oil pressure, temperature and hydrogen content of the equipment can detect defects immediately, the monitoring effect is reliable and comprehensive, and the structure of the original equipment body does not need to be damaged; at the same time, it also has a very convenient oil sample collection structure.

In order to achieve the above object, the present invention adopts the following technical solutions to achieve:

An online monitoring system for substation oil-reducing equipment, the oil-reducing equipment includes an oil drain, including a tee installed on the oil drain; one inlet of the tee is connected to the oil drain, and two of the tee A monitoring sensor and a down-conducting sampling tube are respectively installed on the outlet; the down-conducting sampling tube extends downward, and a sampling valve is installed at the end of the down-conducting sampling tube; switch valve;

The monitoring sensor comprises a shell of cylindrical structure, the bottom of the shell is equipped with a bottom cover, the top of the shell is equipped with a top cover, and the center of the bottom cover is provided with a threaded mounting head for assembling on an outlet of the tee; the shell Inside from bottom to top, the pressure transmitter mounting block for fixing on the bottom cover and the hydrogen sensor for fixing on the pressure transmitter mounting block are arranged sequentially, and the pressure transmitter mounting block is installed with a pressure sensor Transmitter; the pressure transmitter includes a pressure sensor and a temperature sensor; an L-shaped bracket is installed inside the housing close to the top cover, and a circuit board is installed on one side of the L-shaped bracket, and a circuit board is installed on the other side for Dry batteries for powering circuit boards, pressure transmitters and hydrogen sensors;

The threaded installation head introduces the oil into the pressure transmitter installation block through the communication hole opened in the center. The pressure transmitter installation block is provided with a three-way pipeline, and the entrance of the three-way pipeline is the communication hole. The two outlets of the three-way pipeline are respectively the first liquid outlet hole and the second liquid outlet hole;

The side of the pressure transmitter mounting block is provided with a pressure transmitter assembly hole for assembling the pressure transmitter, and the bottom center of the pressure transmitter assembly hole is the first liquid outlet hole; the pressure transmitter The top surface of the pressure transmitter mounting block is connected to the hydrogen sensor, and the second liquid outlet is opened on the top surface of the pressure transmitter mounting block and communicated with the hydrogen sensor detection inlet;

The circuit board includes a CPU and a wireless module;

The wireless module communicates wirelessly with the on-site display outside the monitoring sensor; the on-site display communicates wirelessly with the remote background computer through the wireless communication module.

As a preferred embodiment of the present invention: the on-site display instrument includes a controller, a display, an alarm and a wireless communication module for communicating with a background computer; the controller communicates with the display, the alarm and a wireless communication module connection; the on-site display instrument also includes a power supply module, an ambient temperature sensor and an ambient humidity sensor connected to the controller; the wireless communication module is a 433MHz wireless communication module.

As a preferred embodiment of the present invention: the controller of the on-site display instrument includes an amplifier circuit module, an ARM processor, a digital-to-analog converter, a voltage-to-current converter, and a current constant current device; the controller transmits the monitoring sensor to The signals of the pressure sensor, temperature sensor, and hydrogen sensor are amplified by the built-in amplifier circuit module, and the amplified signal is calculated by the ARM processor; the calculated signal data is converted into a voltage signal by a digital-to-analog converter, Then, the voltage-to-current converter is converted into a current signal, and the current signal is transmitted through the wireless communication module of the local display instrument after being passed through the current constant current device and displayed on the display.

As a preferred embodiment of the present invention: the circuit board of the monitoring sensor is provided with wiring terminals, and the circuit includes a CPU, a wireless communication module and a signal processing module; the CPU is msp430g2433, and the wireless chip is si4432; Inside the casing, a semicircular assembly frame is provided above the hydrogen sensor, and a battery compartment for embedding a single dry battery is provided in the assembly frame, and bracket fixing holes for fixing the L-shaped bracket are provided on both sides of the top surface of the assembly frame , the dry battery is located in the battery compartment between the L-shaped bracket and the assembly frame.

As a preferred embodiment of the present invention: the system collection includes oil pressure, temperature, battery power and dissolved hydrogen content; after the system is started, the system is set first, and after the setting, the power supply of the dry battery, the wireless module and the cpu are turned off Enter the dormant state, when there is a wireless wake-up signal from the outside, the wireless module wakes up the CPU, and the CPU sets the wireless module to the wake-up state, turns on the power supply of the dry battery, collects various parameters, and sends them to the local display. After completion, the system Hibernate again.

As a preferred embodiment of the present invention: the sides of the housing near the bottom and top are provided with side fixing holes for fixing the bottom cover and the top cover; The surface is provided with an internal threaded hole matching the position of the side fixing block; the bottom cover is provided with a threaded hole for fixing the pressure transmitter mounting block, and the threaded hole is a bottom fixing hole; the bottom fixing There are four holes evenly distributed; correspondingly, the bottom surface of the pressure transmitter mounting block is also provided with fastening holes matching the fixing holes on the bottom surface.

As a preferred embodiment of the present invention: the housing of the hydrogen sensor, the housing of the pressure transmitter and the housing are made of copper material; the switching valve is a manual valve, and the valve handle of the manual valve is A rotation mark is provided; the pressure sensor adopts an absolute pressure sensor with a range of 0-0.5 MPa, an accuracy of 0.1, and a temperature of -40-80 degrees; the temperature sensor adopts a grade A Pt100 platinum resistance, with an accuracy of 0.1 degrees; The hydrogen sensor adopts an industrial-grade fuel cell gas sensor with an operating temperature of -40-80°C, a detection range of 0-2000 microliters/liter, and a detection accuracy of ±10% or ±20 microliters/liter.

As a preferred embodiment of the present invention: the oil-less equipment is an oil-less equipment with an oil drain at the bottom and a liquid level gauge at the top; a casing for installing a monitoring sensor is provided on the side of the liquid level gauge tube; the casing is connected with the oil at the top of the oil-less equipment, and the liquid level gauge includes a floating ball structure; one end of the floating ball is placed in the oil, and the other end of the floating ball is rotated by the lifting of the floating ball, and the rotating The process drives the rotation of the magnetically connected level gauge pointer.

As a preferred embodiment of the present invention: the pressure transmitter includes a housing, a cable connector sealedly connected to the upper port of the housing, a temperature sensor and a pressure sensor fixed in the housing, the temperature sensor, The signal output end of the pressure sensor is electrically connected to the cable joint; the temperature sensor is composed of a dead leg and a temperature sensing element fixed in the dead leg, and the nozzle of the dead leg is sealed by a pipe plug and fixed to the housing connected, the signal output line of the temperature sensing element is sealed and electrically connected to the cable joint through the pipe plug, and the blind end of the blind pipe extends from the lower port of the housing outside the housing to contact the first outlet. The oil in the liquid port; the pressure sensing surface of the pressure sensor is in contact with the oil in the first liquid outlet through the lower port of the housing; the longitudinal section of the pressure sensor is an inverted U-shaped structure.

As a preferred embodiment of the present invention: the hydrogen sensor includes a hydrogen sensor housing, a gas detection unit is installed in the hydrogen sensor housing, and the gas detection unit includes an electrolyte layer and a Working electrode, counter electrode and reference electrode; A gas diffusion membrane is installed on the side facing the working electrode in the hydrogen sensor housing, and a gas diffusion membrane is sealed between the gas diffusion membrane and the working electrode for hydrogen The working electrode reaction gas chamber that reacts on the working electrode, the gas diffusion membrane is a gas diffusion membrane with a non-porous structure, and the electrolyte layer is a solid electrolyte layer or a semi-solid electrolyte layer; the hydrogen sensor housing contains a The main body of the opening and the cover that is arranged at the opening of the main body, the side wall of the cover is provided with a sealing ring, and the inner wall of the opening of the hydrogen sensor housing is formed with a seal that matches the sealing ring. Notch; the working electrode is on one side of the electrolyte layer, the counter electrode and reference electrode are on the other side of the electrolyte layer and the counter electrode and reference electrode are on the other side of the electrolyte layer set side by side.

The beneficial effects of the present invention are:

The monitoring sensor of the substation oil-less equipment disclosed by the present invention collects pressure signals, temperature signals and hydrogen signals, and then transmits the collected signals to the on-site display device; the on-site display device performs on-site display and transmits to the background computer; the background computer is located in the substation Therefore, the whole monitoring is real-time online monitoring, which is very practical and convenient, so that the defects of the oil parameters of the oil-less equipment can be found in an early stage; the setting of the down-conducting sampling pipe and sampling valve makes the oil collection position at a lower position , making oil collection more convenient. The monitoring sensor of the present invention integrates a pressure sensor, a temperature sensor and a hydrogen sensor, so the collected parameters are comprehensive;

The monitoring sensor of the present invention comprises a shell of cylindrical structure, a bottom cover is installed on the bottom of the shell, a top cover is installed on the top of the shell, and the center of the bottom cover is provided with a threaded mounting head for assembling on an outlet of the tee; the whole monitoring The sensor is installed in the form of a threaded head, so it can be reliably assembled and sealed; the assembly process is also very convenient; the inside of the housing of the present invention is sequentially provided with mounting blocks for pressure transmitters fixedly installed on the bottom cover from bottom to top and a hydrogen sensor for fixing on the pressure transmitter installation block, the pressure transmitter installation block is equipped with a pressure transmitter; the pressure transmitter includes a pressure sensor and a temperature sensor; the inside of the housing is close to The position of the top cover is installed with an L-shaped bracket. The circuit board is installed on one side of the L-shaped bracket, and the dry battery for powering the circuit board, pressure transmitter and hydrogen sensor is installed on the other side; the pressure transmitter mounting block is used as a support The installation and three-way structure provide the installation position of the pressure transmitter and the hydrogen sensor, and at the same time provide the pressure transmitter and the hydrogen sensor with the oil contact through the first liquid outlet and the second liquid outlet to reliably collect the oil The environment of liquid parameters.

In summary, the present invention can monitor the pressure, temperature and hydrogen in the insulating bushing in real time, and can find defects through pressure changes at the first time, avoiding further harm; Located above 4 meters above the ground, the sampling valve can achieve the position consistent with the height of the operator on the ground through the down-leading sampling pipe) to carry out oil sample collection; positive value.

Description of drawings

Fig. 1 is the overall structure schematic diagram of a kind of embodiment of the present invention;

Figure 2 is a partial enlarged view of A in Figure 1;

Fig. 3 is the exterior view of a kind of embodiment of monitoring sensor of the present invention;

Fig. 4 is an exploded view of a specific embodiment of the monitoring sensor of the present invention;

Fig. 5 is a structural schematic diagram of a specific embodiment of the housing of the monitoring sensor of the present invention;

Fig. 6 is a structural schematic diagram of a specific embodiment of the pressure transmitter mounting block of the monitoring sensor of the present invention;

Fig. 7 is an effect diagram of another angle of the mounting block of the pressure transmitter described in Fig. 6;

Fig. 8 is a schematic diagram of an exploded structure of a pressure transmitter mounting block and a hydrogen sensor of the present invention;

Fig. 9 is a structural schematic diagram of another angle of Fig. 8;

Fig. 10 is a circuit structure block diagram of a specific embodiment of the local display instrument of the present invention;

Fig. 11 is a circuit structure block diagram of a specific embodiment of the monitoring sensor of the present invention;

Figure 12 is a schematic structural view of a preferred embodiment of the present invention;

Fig. 13 is a schematic structural view of a preferred embodiment of the hydrogen sensor of the present invention;

Fig. 14 is a schematic structural view of a preferred embodiment of the pressure transmitter of the present invention.

Explanation of reference signs:

1-insulating sleeve, 2-oil drain, 3-monitoring sensor, 4-tee, 5-down-conducting sampling pipe, 6-sampling valve, 7-local display instrument, 8-wireless communication module, 9-backstage Computer, 10-switching valve, 11-top equalizing cover, 12-liquid level gauge, 13-monitoring sensor;

81-shell, 82-cable connector, 83-pressure sensor, 84-blind pipe, 85-temperature sensing element, 86-pipe plug, 87-blind end, 88-pressure sampling circuit module;

101-shell, 102-thread mounting head, 103-communication hole, 104-fixing hole on the bottom surface, 105-fixing hole on the side, 106-circuit board, 107-bracket, 108-dry battery, 109-hydrogen sensor, 110-wiring socket, 111-pressure transmitter mounting block, 112-bottom cover, 113-top cover, 114-battery compartment, 115-bracket fixing hole, 116-assembly frame, 117-baffle, 118-pressure transmitter, 119-bottom Fixing hole, 120-internal threaded hole;

304-temperature sensor, 305-pressure sensor, 307-wireless module, 308-terminal, 309-dry battery, 310-CPU, 311-hydrogen sensor, 312-signal processing module;

711-alarm, 712-controller, 713-display, 714-wireless communication module, 715-environmental humidity sensor, 716-environmental temperature sensor;

901-hydrogen sensor shell, 902-gas detection unit, 903-gas diffusion membrane, 904-seal, 905-working electrode reaction gas chamber, 906-oxygen storage space, 911-main body, 912-cover, 913-sealing ring , 914-notch, 915-first pin, 916-second pin, 917-third pin, 921-electrolyte layer, 922-working electrode, 923-counter electrode, 924-reference electrode, 925- Working electrode lead wire, 926-counter electrode lead wire, 927-reference electrode lead wire;

1111-main liquid inlet hole, 1112-fastening hole, 1113-pressure transmitter assembly hole, 1114-first liquid outlet hole, 1115-second liquid outlet hole, 1116-hydrogen sensor detection inlet.

Detailed ways

Describe the specific embodiment of the present invention below in conjunction with accompanying drawing and embodiment:

As shown in Figures 1 to 14, which show the specific implementation of the present invention, as shown in the figure, the present invention discloses an online monitoring system for substation oil-less equipment, the oil-less equipment includes an oil outlet, and includes A tee 4 on the oil drain; an inlet of the tee is connected with the oil drain (by a flange), and a monitoring sensor 3 and a down sampling pipe 5 are respectively installed on two outlets of the tee; The lower sampling pipe extends downward, and a sampling valve 6 is installed at the end of the lower sampling pipe; a switching valve 10 for switching the inlet and the two outlets is installed on the tee;

The monitoring sensor comprises a shell 101 of cylindrical structure, a bottom cover 112 is installed on the bottom of the shell, a top cover 113 is installed on the top of the shell, and the center of the bottom cover is provided with a threaded mounting head 102 for assembling on an outlet of the tee ; The inside of the housing is sequentially provided with a pressure transmitter mounting block 111 fixed on the bottom cover and a hydrogen sensor 109 fixed on the pressure transmitter mounting block from bottom to top. A pressure transmitter 118 is installed on the mounting block; the pressure transmitter includes a pressure sensor and a temperature sensor; an L-shaped bracket 107 is installed inside the housing close to the top cover, and a circuit board is installed on one side of the L-shaped bracket 106, the other side is equipped with a dry battery 108 for powering the circuit board, pressure transmitter and hydrogen sensor;

The threaded installation head introduces the oil into the pressure transmitter installation block 111 through the communication hole 103 opened in the center, and the pressure transmitter installation block 111 is provided with a three-way pipeline, and the entrance of the three-way pipeline is the Communication holes, the two outlets of the three-way pipeline are the first liquid outlet hole 1114 and the second liquid outlet hole 1115;

The side of the pressure transmitter mounting block is provided with a pressure transmitter assembly hole 1113 for assembling the pressure transmitter, and the center of the bottom of the pressure transmitter assembly hole is the first liquid outlet; the pressure transmitter The top surface of the transmitter mounting block is connected to the hydrogen sensor, and the second liquid outlet is opened on the top surface of the pressure transmitter mounting block and communicates with the hydrogen sensor detection inlet 1116;

The circuit board includes a CPU 310 and a wireless module 307;

The wireless module communicates wirelessly with the on-site display outside the monitoring sensor; the on-site display communicates wirelessly with the remote background computer 9 through a wireless communication module (8, 714).

Preferably, as shown in Figure 10: the on-site display instrument comprises a controller 712, a display 713, an alarm 711 and a wireless communication module (8, 714) for communicating with a background computer; The display, the alarm and the wireless communication module are connected; the on-site display instrument also includes a power supply module, an ambient temperature sensor 716 and an ambient humidity sensor 715 connected to the controller; the wireless communication module is a 433MHz wireless communication module. The on-the-spot indicator is a cabinet-type on-the-spot indicator with a heater at the bottom to facilitate temperature rise in Xinjiang's extremely cold weather; the heating module of the heater is connected to the controller.

Preferably, as shown in Figure 10: the controller of the on-site display instrument includes an amplifier circuit module, an ARM processor, a digital-to-analog converter, a voltage-to-current converter, and a current constant current device; The signals of the pressure sensor, temperature sensor, and hydrogen sensor are amplified through the built-in amplifying circuit module, and the amplified signal is calculated by the ARM processor; the calculated signal data is converted into a voltage signal by a digital-to-analog converter, and then The voltage-to-current converter is converted into a current signal, and the current signal is transmitted through the wireless communication module of the local display instrument after passing through the current constant current device and displayed on the display. The on-site display can be connected to a maximum of 128 sampling modules (monitoring sensors), and can even be expanded to 256. It is enough to install one on-site display (repeater) in each substation. The pressure, temperature and dissolved hydrogen data of each monitoring sensor can be displayed cyclically, and the data will be processed and integrated and sent wirelessly to the background (computer) server.

Preferably, as shown in Figure 11: the circuit board of the monitoring sensor is provided with a connection terminal 308, and the line includes a CPU, a wireless communication module and a signal processing module 312; the CPU is msp430g2433, and the wireless chip is si4432; Inside the casing, a semi-circular assembly frame 116 is arranged above the hydrogen sensor, and a battery compartment 114 for embedding a single dry battery is arranged in the assembly frame, and the two sides of the top surface of the assembly frame are provided with brackets for fixing the L-shaped bracket. The bracket fixing hole 115, the dry battery is located in the battery compartment between the L-shaped bracket and the assembly frame. In this embodiment, both the CPU and the wireless chip are low-power components, which are conducive to the long-term use of the device, do not need external power, and are suitable for the production environment of the substation. Especially when it is located at a high place, it is very difficult to connect an external power supply; therefore, the monitoring sensor uses low-power wireless transmission; the on-site display uses wireless transmission, and its power supply can also use a battery to avoid the inconvenience of external power supply. The structure of the assembly frame reliably fixes the dry battery and the L-shaped bracket; the L-shaped bracket allows the circuit board and the battery to be reliably assembled and separated; the bottom of the assembly frame is separated by a baffle, which can be separated from the sensor at the bottom; this manual describes The orientations such as up, down, left, and right are described according to the position shown in the figure or the vertical installation position when the monitoring sensor is installed; it is not a specific limitation on the structure, as long as the relative position is inconvenient, the technical solution and technical effect of the present invention can be realized.

Preferably, as shown in the figure: the system collection includes oil pressure, temperature, battery power and dissolved hydrogen content; after the system is started, the system is set first, and after the setting is completed, the power supply of the dry battery is turned off, and the wireless module and the cpu enter dormancy state, when there is a wireless wake-up signal from the outside, the wireless module wakes up the CPU, and then the CPU sets the wireless module to the wake-up state, turns on the power supply of the dry battery, collects various parameters, and sends them to the local display device, and the system sleeps again after completion . The control method of this embodiment makes the energy consumption of the monitoring sensor part low, and can achieve a reliable power supply time of more than three years.

Preferably, as shown in Figures 3-9: the sides of the housing near the bottom and top are provided with side fixing holes 105 for fixing the bottom cover and the top cover; correspondingly, the bottom cover and the top cover are embedded in the inside of the housing The outer surface of the outer surface is provided with an internal threaded hole 120 matching the position of the side fixing block; the bottom cover is provided with a threaded hole for fixing the pressure transmitter mounting block, and the threaded hole is a bottom fixing hole (104 , 119); the bottom surface fixing holes are uniformly distributed four; correspondingly, the bottom surface of the pressure transmitter mounting block is also provided with fastening holes 1112 that match the bottom surface fixing holes. The side fixing of the side fixing holes can save frontal space, and at the same time, the evenly distributed fixing holes can be fixed reliably.

Preferably, as shown in Figures 3-9: the casing of the hydrogen sensor, the casing of the pressure transmitter and the casing are made of copper; the copper material provides reliable shielding performance. The switching valve 10 is a manual valve, and the valve handle of the manual valve is provided with a rotation mark; the pressure sensor adopts an absolute pressure sensor with a range of 0-0.5 MPa, an accuracy of 0.1, and a temperature of -40-80 degrees ; The temperature sensor uses a grade A Pt100 platinum resistor with an accuracy of 0.1 degrees; the hydrogen sensor uses an industrial-grade fuel cell gas sensor with an operating temperature of -40-80C°, a detection range of 0-2000 microliters/liter, and a detection accuracy of : ±10% or ±20 μl/l.

Preferably, as shown in Figure 12: the oil-less equipment is an oil-less equipment with an oil drain at the bottom and a liquid level gauge 12 at the top; a sleeve for installing a monitoring sensor is provided on the side of the liquid level gauge tube; the casing is connected with the oil at the top of the oil-less equipment, and the liquid level gauge includes a floating ball structure; one end of the floating ball is placed in the oil, and the other end of the floating ball is rotated by the lifting of the floating ball, and the rotating The process drives the rotation of the magnetically connected level gauge pointer. In this way, the simultaneous monitoring of pressure, temperature and hydrogen can provide reliable data, and detect defects scientifically and accurately in real time to avoid losses. The structure of the liquid level gauge disclosed in this embodiment is based on a mechanical principle, and no wiring is required, and the monitoring sensor also does not need wiring, so there is no need to take power from a high place to prevent potential safety hazards, making the solution disclosed in this embodiment more practical and reliable. The oil-less equipment at the lower oil outlet of the upper liquid level gauge can refer to the high-voltage insulating bushing; the oil-less equipment refers to a type of equipment filled with insulating oil. Due to the lack of oil, this type of equipment currently lacks effective detection methods. Oil samples are taken out from the sampling valve at the oil discharge port for regular manual testing.

Preferably, as shown in FIG. 14 : the pressure transmitter includes a housing 81, a cable joint 82 sealingly connected to the upper port of the housing, a temperature sensor and a pressure sensor 83 fixed in the housing, and the temperature The signal output ends of the sensor and the pressure sensor are electrically connected to the cable joint; the temperature sensor is composed of a dead leg and a temperature sensing element 85 fixed in the dead leg, and the mouth of the dead leg is sealed by a pipe plug and connected to the The housing is fixedly connected, and the signal output line of the temperature sensing element 85 is sealed and passed through the pipe plug 86 to be electrically connected to the cable joint. The blind end of the blind pipe extends from the lower port of the housing to contact outside the housing. The oil in the first liquid outlet; the pressure sensing surface of the pressure sensor is in contact with the oil in the first liquid outlet through the lower port of the housing; the longitudinal section of the pressure sensor is an inverted U-shaped structure. In the structure of the pressure transmitter disclosed in this embodiment, the temperature sensor and the pressure sensor are collectively installed in the housing, and the end of the dead leg with the built-in temperature sensing element is extended out of the housing from the lower port of the housing In addition, the pressure sensing surface of the pressure sensor is communicated with the environment through the lower port of the shell; therefore, under the premise of ensuring temperature and pressure measurement and control, the structure is more compact, the installation space is greatly reduced, and the installation and maintenance work is facilitated.

Preferably, as shown in Figure 13: the hydrogen sensor includes a hydrogen sensor housing 901, a gas detection unit 902 is installed in the hydrogen sensor housing, the gas detection unit includes an electrolyte layer 921 and is combined with the electrolyte layer An integral working electrode 922, a counter electrode 923 and a reference electrode 924; a gas diffusion membrane 903 is installed on the side facing the working electrode in the hydrogen sensor housing, and the gas diffusion membrane and the working electrode are sealed Part 904 is sealed to form a working electrode reaction gas chamber 905 for hydrogen to react on the working electrode, the gas diffusion membrane is a gas diffusion membrane with a non-porous structure, and the electrolyte layer is a solid electrolyte layer or a semi-solid electrolyte layer The hydrogen sensor housing includes a main body 911 with an opening and a cover 912 covering the opening of the main body, the side wall of the cover is provided with a sealing ring 913, the opening of the hydrogen sensor housing The inner wall is formed with a notch 914 matching the sealing ring; the working electrode is located on one side of the electrolyte layer, the counter electrode and reference electrode are located on the other side of the electrolyte layer, and the counter electrode and the reference electrode are arranged side by side on the other side of the electrolyte layer. The hydrogen sensor disclosed in this embodiment can more effectively detect low-concentration hydrogen, has a fast response, and can cope with hydrogen detection in harsh environments.

The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and can also be made within the scope of knowledge of those of ordinary skill in the art without departing from the gist of the present invention. These changes involve related technologies well known to those skilled in the art, and these all fall within the protection scope of the patent of the present invention.

Many other changes and modifications can be made without departing from the spirit and scope of the present invention. It should be understood that the invention is not limited to the particular embodiments, but that the scope of the invention is defined by the appended claims.

Claims (10)

1. the on-line monitoring system of the few oily equipment of substation, few oily equipment includes fuel outlet, it is characterised in that：Include installation A threeway on the fuel outlet；One entrance of threeway is connected with the fuel outlet, in two outlets of threeway respectively Monitoring sensor is installed and draws down-sampling pipe；Draw down-sampling pipe to extend downwardly, and draw the end installation sampling valve of down-sampling pipe Door；It is equipped with to switch entrance in the threeway and two exports the switch valve being respectively turned on；

The monitoring sensor includes the shell of cylinder type, the bottom installation bottom cover of shell, and head cover is installed at the top of shell, The centrally disposed screw thread mounting head for being useful for being assembled in the one outlet of the threeway of bottom cover；The enclosure is from bottom to top Set gradually the pressure transmitter mounting blocks being fixedly mounted on bottom cover and for being fixed on pressure transmitter mounting blocks Hydrogen gas sensor, pressure transmitter is installed on the pressure transmitter mounting blocks；The pressure transmitter is passed comprising pressure Sensor and temperature sensor；The enclosure is equipped with the stent of L-type, the stent one side installation of L-type close to the position of head cover Circuit board, opposite side are equipped with the dry cell for powering for circuit board, pressure transmitter and hydrogen gas sensor；

The screw thread mounting head is introduced fluid inside pressure transmitter mounting blocks by the intercommunicating pore that center opens up, the pressure Triplate line is set in transmitter mounting blocks, and the entrance of triplate line is the intercommunicating pore, and two outlets of triplate line are distinguished For the first fluid hole and the second fluid hole；

The side of the pressure transmitter mounting blocks offers the pressure transmitter assembly hole for stacking pressure transmitter, pressure The bottom centre of transmitter assembly hole is first fluid hole；The top surface of the pressure transmitter mounting blocks and the hydrogen Sensor connects, and second fluid hole is opened in the top surface of the pressure transmitter mounting blocks and is detected with hydrogen gas sensor Entrance connects；

The circuit board includes CPU and wireless module；

The display instrument wireless telecommunications on the spot of the wireless module and monitoring sensor external；After the display instrument on the spot and distal end Platform computer passes through wireless communication module wireless telecommunications.

2. the on-line monitoring system of the few oily equipment of substation as described in claim 1, it is characterised in that：The display instrument on the spot Include controller, display, alarm and wireless communication module for being communicated with background computer；The controller with it is described Display, alarm are connected with wireless communication module；The display instrument on the spot also includes power module, is connected with controller Environment temperature sensor and ambient humidity sensor；The wireless communication module is 433MHz wireless communication modules.

3. the on-line monitoring system of the few oily equipment of substation as claimed in claim 2, it is characterised in that：The display instrument on the spot Controller include amplification circuit module, arm processor, digital analog converter, voltage current adapter and electric current galvanostat； Controller by monitor sensor passes come pressure sensor, temperature sensor, hydrogen gas sensor signal pass through it is built-in Amplification circuit module carries out signal amplification, and amplified signal is calculated by the arm processor；The signal being calculated Data are converted into voltage signal by digital analog converter, and then changing into electric current by the voltage current adapter believes Number, current signal by the wireless communication module transmission of display instrument on the spot after electric current galvanostat and by display by showing Show.

4. the on-line monitoring system of the few oily equipment of substation as described in claim 1, it is characterised in that：The monitoring sensor Circuit board on be provided with wire connection terminal, CPU, wireless communication module and signal processing module are included on circuit；The CPU be for Msp430g2433, wireless chip si4432；The enclosure is provided with semicircular group above hydrogen gas sensor It shelves, assembles and be provided with to be embedded in the battery compartment of single dry cell in frame, the both sides for assembling the top surface of frame are provided with for solid The stent mounting hole of the fixed L-type support, the dry cell are located in the battery compartment between L-type support and assembling frame.

5. the on-line monitoring system of the few oily equipment of substation as claimed in claim 4, it is characterised in that：The system acquisition amount Include oil pressure, temperature, battery capacity and dissolving hydrogen content；After system starts, system is first configured, and is closed after setting up dry The power supply of battery, wireless module and cpu enter dormant state, and when there is wireless wake-up signal in outside, wireless module is waken up by cpu Come, wireless module is arranged to wake state by cpu again, opens the power supply of dry cell, is gathered each parameter, and is sent to and shows on the spot Show instrument, after finishing system dormancy again.

6. the on-line monitoring system of the few oily equipment of substation as described in claim 1, it is characterised in that：The shell is the bottom of close to The side at portion and top is provided with the side mounting hole for fixed bottom cover and head cover；It is corresponding, the bottom cover and head cover insertion The outer surface of the part of enclosure offers the internal thread hole with the side fixed block location matches；It is opened up on the bottom cover It is useful for fixing the threaded hole of the pressure transmitter mounting blocks, the threaded hole is bottom surface mounting hole；The bottom surface mounting hole For uniformly distributed four；Corresponding, the bottom surface of the pressure transmitter mounting blocks is also provided with positioned at matched tight with bottom surface mounting hole Solid hole.

7. the on-line monitoring system of the few oily equipment of substation as described in claim 1, it is characterised in that：The hydrogen gas sensor Housing, the housing of pressure transmitter and the shell are copper material；The switch valve is hand-operated valve, the hand-operated valve Rotating mark is provided on valve handle；The pressure sensor uses range as 0~0.5MPa, and precision is 0.1 grade, and temperature is -40 ~80 degree of absolute pressure transducer；The temperature sensor uses A grades of Pt100 platinum resistance, and precision is 0.1 degree；The hydrogen Sensor uses technical grade fuel cell gas sensor, operating temperature：- 40-80 DEG C, 0-2000 microlitres/liter of detection range, inspection Survey precision：± 10% or ± 20 microlitres/liter.

8. the on-line monitoring system of the few oily equipment of substation as described in claim 1, it is characterised in that：Few oily equipment is Few oily equipment that bottom includes fuel outlet and top includes liquid level gauge；The housing side of the liquid level gauge offers to install Monitor the casing of sensor；Described sleeve pipe is connected with the fluid of few oily equipment inner top, and the liquid level gauge includes floating ball structure；It is floating One end of ball is placed in fluid, and the floating ball other end is rotated by the lifting of floating ball, and rotation process drives the liquid level of magnetic connection Count indicators turn.

9. the on-line monitoring system of the few oily equipment of substation as described in claim 1, it is characterised in that：The pressure transmitter Comprising housing, the cable connector of the housing upper port is sealedly attached to, the in vivo temperature sensor of shell is fixed on and pressure passes Sensor, the temperature sensor, the signal output part of pressure sensor are electrically connected with the cable connector；The temperature sensor It is made of blind pipe and the temperature-sensing element being fixed in the blind pipe, the nozzle of blind pipe, which is sealed by pipe plug and fixed with housing, to be connected It connects, pipe plug described in the output line hermetically passing of the temperature-sensing element is electrically connected with cable connector, the cecum portion of blind pipe Extend the fluid of the first liquid outlet described in the outer contacting of housing from the lower port of housing；The pressure sensitive of the pressure sensor Face is contacted by the lower port of housing with the fluid of the first liquid outlet；The longitudinal section of the pressure sensor is inverted U-shaped.

10. the on-line monitoring system of the few oily equipment of substation as described in claim 1, it is characterised in that：The hydrogen sensing Device includes hydrogen gas sensor shell, and gas detection cell is equipped in the hydrogen gas sensor shell, and the gas detection is single Member includes electrolyte layer and the working electrode being combined into one with the electrolyte layer, to electrode and reference electrode；The hydrogen Gas diffusion membrane, the gas diffusion membrane and the work are installed towards the one side of the working electrode in gas sensor shell The working electrode to be formed and reacted for hydrogen on the working electrode is sealed between electrode by sealing element and reacts gas chamber, The gas diffusion membrane is the gas diffusion membrane of non-porous structure, and the electrolyte layer is solid-state electrolyte layer or semisolid electrolyte Layer；The hydrogen gas sensor shell is located at the cover of the opening of the main body, the lid comprising the main body with opening and lid Sealing ring is provided on the side wall of body, the inner wall of the opening of the hydrogen gas sensor shell is formed with and the sealing ring phase The recess matched somebody with somebody；The working electrode is located at the one side of the electrolyte layer, described to be located at the electrolysis to electrode and reference electrode The opposite side of matter layer and described electrode and reference electrode are set up in parallel in the opposite side of the electrolyte layer.