Transformer monitoring system

Abstract

The utility model provides a transformer monitoring system, and relates to the technical field of transformer monitoring. The transformer monitoring system comprises at least one monitoring terminal, each monitoring terminal is connected with at least one transformer, and each monitoring terminal is connected with a display screen. The transformer comprises at least one of the following monitoring sensors: a temperature monitoring sensor arranged on a coil and an iron core of the transformer; the arc light monitoring sensor is arranged at an electrical connection point of the transformer; the temperature and humidity monitoring sensor is arranged on the surface of the shell of the transformer; the monitoring terminal comprises a communication management machine which is connected with the display screen and the temperature and humidity monitoring sensor; the temperature monitoring transmitter is connected with the communication management machine and the temperature monitoring sensor; and the arc light monitoring transmitter is connected with the communication management machine and the arc light monitoring sensor. According to the scheme of the utility model, the problem of real-time monitoring of the operation state and the environment state of the transformer is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformer monitoring, in particular to a transformer monitoring system. Background Art

[0002] In urban rail transit power supply systems, rectifiers and power substations supply power to various electrical equipment in stations, including traction locomotives, environmental control equipment, communications equipment, integrated monitoring, water supply and drainage systems, escalators, etc. Their reliability is crucial to the safety and normal operation of the stations. Therefore, to ensure the safe and reliable operation of rectifiers and power substations, it is necessary to monitor the operating status and environmental conditions of the transformers in these rectifiers and power substations in real time. Utility Model Content

[0003] The purpose of the technical solution of the utility model is to provide a transformer monitoring system to solve the problem of real-time monitoring of the operating status and environmental status of transformers in rectifiers and power substations in the prior art.

[0004] In order to achieve the above object, the utility model is achieved as follows:

[0005] The embodiment of the utility model provides a transformer monitoring system, comprising: at least one monitoring terminal, each of the monitoring terminals being connected to at least one transformer, and each of the monitoring terminals being connected to a display screen;

[0006] The transformer includes at least one of the following monitoring sensors:

[0007] Temperature monitoring sensors are provided on the coil and the core of the transformer;

[0008] an arc monitoring sensor, arranged at an electrical connection point of the transformer;

[0009] A temperature and humidity monitoring sensor is provided on the shell surface of the transformer;

[0010] The monitoring terminal includes:

[0011] A communication management machine, connected to the display screen and the temperature and humidity monitoring sensor respectively;

[0012] A temperature monitoring transmitter is connected to the communication management machine and the temperature monitoring sensor respectively;

[0013] The arc light monitoring transmitter is connected to the communication management machine and the arc light monitoring sensor respectively.

[0014] Optionally, in the transformer monitoring system, the monitoring terminal is embedded in the casing of the transformer.

[0015] Optionally, in the transformer monitoring system, the monitoring terminal is installed on a wall, and the wall is within a preset range from the transformer.

[0016] Optionally, in the transformer monitoring system, the temperature monitoring sensor is a fluorescent fiber temperature monitoring sensor;

[0017] The temperature monitoring transmitter is connected to the temperature monitoring sensor via an optical fiber signal line.

[0018] Optionally, in the transformer monitoring system, the arc light monitoring sensor is arranged at an electrical connection point of the transformer coil.

[0019] Optionally, in the transformer monitoring system, the transformer further includes at least one of the following:

[0020] A partial discharge monitoring sensor is arranged inside the transformer;

[0021] a smoke monitoring sensor, disposed inside the transformer;

[0022] A vibration monitoring sensor is provided on the shell surface of the transformer;

[0023] A noise monitoring sensor is arranged on the shell surface of the transformer;

[0024] The monitoring terminal further includes at least one of the following:

[0025] A partial discharge monitoring collector is connected to the communication management machine and the partial discharge monitoring sensor respectively;

[0026] The smoke monitoring collector is connected to the communication management machine and the smoke monitoring sensor respectively.

[0027] Optionally, in the transformer monitoring system, the partial discharge monitoring sensor is a UHF sensor.

[0028] Optionally, in the transformer monitoring system, the vibration monitoring sensor includes at least one of a velocity sensor, an acceleration sensor, and a displacement sensor.

[0029] Optionally, in the transformer monitoring system, the communication management machine includes at least one of an Ethernet fiber optic interface, an RS485 interface, a relay interface, a switch interface, and an analog interface.

[0030] The beneficial effects of the utility model are:

[0031] In the above technical solution, the transformer monitoring system includes at least one monitoring terminal, each of which is connected to at least one transformer, and each of which is connected to a display screen; wherein the transformer includes at least one of the following monitoring sensors: a temperature monitoring sensor, arranged on the coil and core of the transformer; an arc monitoring sensor, arranged at the electrical connection point of the transformer; a temperature and humidity monitoring sensor, arranged on the shell surface of the transformer; the monitoring terminal includes: a communication management machine, connected to the display screen and the temperature and humidity monitoring sensor respectively; a temperature monitoring transmitter, connected to the communication management machine and the temperature monitoring sensor respectively; an arc monitoring transmitter, connected to the communication management machine and the arc monitoring sensor respectively. In this way, real-time monitoring of the transformer operating status and environmental status is achieved, which facilitates monitoring personnel to understand and grasp the current operating status and historical operating status of the transformer. It has good application prospects, provides a basis for transformer diagnosis analysis, risk assessment and fault warning, and greatly improves the reliability, safety and effectiveness of transformer operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 One of the structural diagrams of the transformer monitoring system according to an embodiment of the present utility model is shown;

[0033] Figure 2 A second structural diagram showing a transformer monitoring system according to an embodiment of the present invention;

[0034] Figure 3 FIG3 is a third structural diagram of a transformer monitoring system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] The utility model aims to solve the problem of real-time monitoring of the operating state and environmental state of transformers in rectifier and power substations in the prior art and provides a transformer monitoring system.

[0037] like Figure 1 As shown, an embodiment of the present utility model provides a transformer monitoring system, comprising: at least one monitoring terminal, each of the monitoring terminals being connected to at least one transformer, and each of the monitoring terminals being connected to a display screen;

[0038] The transformer includes at least one of the following monitoring sensors:

[0039] Temperature monitoring sensors are provided on the coil and the core of the transformer;

[0040] an arc monitoring sensor, arranged at an electrical connection point of the transformer;

[0041] A temperature and humidity monitoring sensor is provided on the shell surface of the transformer;

[0042] The monitoring terminal includes:

[0043] A communication management machine, connected to the display screen and the temperature and humidity monitoring sensor respectively;

[0044] A temperature monitoring transmitter is connected to the communication management machine and the temperature monitoring sensor respectively;

[0045] The arc light monitoring transmitter is connected to the communication management machine and the arc light monitoring sensor respectively.

[0046] It should be noted that the transformer monitoring system described in the embodiments of the present invention has high operational safety performance and strong anti-interference capabilities, and is suitable for integrated systems such as urban rail transit power supply systems. In the embodiments of the present invention, the transformer monitoring system may include one monitoring terminal, which can be connected to one transformer; or the transformer monitoring system may include one monitoring terminal, which can be connected to multiple transformers; or the transformer monitoring system may include multiple monitoring terminals, each of which can be connected to one transformer; or the transformer monitoring system may include multiple monitoring terminals, each of which can be connected to multiple transformers.

[0047] The transformer includes a temperature monitoring sensor for monitoring the temperature of the three-phase coil and iron core of the transformer, and an arc light monitoring sensor for monitoring the instantaneous discharge arc light at the electrical connection point of the transformer; correspondingly, the monitoring terminal includes a temperature monitoring transmitter for collecting temperature information from the temperature monitoring sensor, and an arc light monitoring transmitter for collecting instantaneous arc light information from the arc light monitoring sensor, thereby realizing real-time monitoring of the operating status of the transformer.

[0048] The transformer includes a temperature and humidity monitoring sensor for collecting temperature and humidity information of the transformer's environment to achieve real-time monitoring of the transformer's environmental status.

[0049] The transformer monitoring system described in the embodiment of the present utility model adopts PHM (Prognostics Health Management) technology to collect the temperature information and instantaneous discharge arc information of the transformer in real time, as well as the temperature information and humidity information of the environment in which the transformer is located. The above information can be displayed on a display screen to realize real-time monitoring of the transformer's operating status and environmental status, thereby providing a basis for monitoring personnel to determine the type and location of transformer faults.

[0050] It should be noted that the communication management machine can be a computer, which reads various monitoring sensor information, stores it, and forwards it to the display screen through optical fiber for display, providing a data basis for subsequent information processing and sound and light warnings in case of abnormalities. It can further be used for transformer status evaluation and risk assessment to achieve life warning.

[0051] The display screen can display the collected information of each monitoring sensor and set the warning value. The display screen can also be connected to equipment such as a heater, a fan or an alarm.

[0052] In addition, the communication management machine can be connected to the Internet to achieve real-time monitoring or remote management of the transformer and promptly respond to various situations during the operation of the transformer.

[0053] As an optional embodiment, the monitoring terminal is embedded in the housing of the transformer.

[0054] In an embodiment of the present invention, each monitoring terminal in the transformer monitoring system is connected to a transformer, and each monitoring terminal is embedded in a housing of the transformer.

[0055] As an optional embodiment, the monitoring terminal is installed on a wall, and the wall is within a preset range from the transformer.

[0056] In an embodiment of the present invention, the monitoring terminal is wall-mounted on a wall within a preset range from the transformer, and the preset range is generally 0 to 5 meters.

[0057] As an optional embodiment, the temperature monitoring sensor is a fluorescent fiber temperature monitoring sensor;

[0058] The temperature monitoring transmitter is connected to the temperature monitoring sensor via an optical fiber signal line.

[0059] In an embodiment of the present invention, a fluorescent fiber optic temperature monitoring sensor is used to monitor the three-phase coil and core temperatures of a transformer. Specifically, the temperature probe of the fluorescent fiber optic temperature monitoring sensor measures the temperatures of the high- and low-voltage coils and the hot spots of the core of phases A, B, and C. The fluorescent fiber optic temperature monitoring sensor then converts the temperature information measured by the temperature probe into an optical signal and transmits it to a temperature monitoring transmitter via an optical fiber signal line. The temperature probe of the fluorescent fiber optic temperature monitoring sensor is extremely small and is pre-embedded and installed in the temperature measurement position reserved for each phase coil of the transformer. The pigtail is made of a soft, durable, specially made optical fiber with advantages such as high transmission bandwidth, stable signal, anti-electromagnetic interference, anti-flexing, high impact strength, and quick connection. The pigtail sheath is made of polytetrafluoroethylene, which has high temperature resistance, aging resistance, corrosion resistance, high insulation, and non-adhesion properties, making it suitable for harsh operating environments such as high voltage, high temperature, and strong electromagnetic fields.

[0060] As an optional embodiment, the arc light monitoring sensor is arranged at an electrical connection point of the transformer coil.

[0061] In an embodiment of the present invention, the arc light monitoring sensor is specifically arranged at a coil cable connector of a transformer.

[0062] It should be noted that when a short circuit occurs in the medium and low voltage busbars of a transformer, destructive arc light will be generated. The arc short circuit in the area covered by the arc light monitoring sensor can be quickly located, so that the protection system can act quickly, cut off the fault current, and minimize the damage to the transformer and personal injury caused by the arc light.

[0063] It should also be noted that in order to improve the reliability of the arc monitoring sensor, the arc protection adopts dual criteria of arc light and current, and when the transformer fails, a protection lockout and alarm event are generated.

[0064] As an optional embodiment, Figure 2 As shown, the transformer further includes at least one of the following:

[0065] A partial discharge monitoring sensor is arranged inside the transformer;

[0066] a smoke monitoring sensor, disposed inside the transformer;

[0067] A vibration monitoring sensor is provided on the shell surface of the transformer;

[0068] A noise monitoring sensor is arranged on the shell surface of the transformer;

[0069] The monitoring terminal further includes at least one of the following:

[0070] A partial discharge monitoring collector is connected to the communication management machine and the partial discharge monitoring sensor respectively;

[0071] The smoke monitoring collector is connected to the communication management machine and the smoke monitoring sensor respectively.

[0072] In an embodiment of the present invention, the aforementioned monitoring sensors can monitor the transformer's operational health, including partial discharge signal monitoring, smoke monitoring, and operational vibration monitoring. Furthermore, the transformer's environmental status, including ambient noise monitoring, can be monitored. The transformer also includes a vibration monitoring sensor located on the ground near the transformer, which is connected to a communication management unit for real-time monitoring of ground vibration.

[0073] Correspondingly, a partial discharge monitoring collector and a smoke monitoring collector are set in the monitoring terminal to collect partial discharge signals and smoke signals.

[0074] It should be noted that the transformer may also include other monitoring sensors, such as a fan status monitoring sensor (for monitoring whether the fan is faulty) and a casing door travel switch monitoring sensor (for monitoring the status of the transformer casing door).

[0075] As an optional embodiment, the partial discharge monitoring sensor is a UHF (Ultra High Frequency) sensor.

[0076] In an embodiment of the present invention, the partial discharge monitoring sensor is a UHF sensor, that is, a UHF detection method is used to monitor the partial discharge signal inside the transformer. The partial discharge signal of the transformer is collected by utilizing the generation and transmission attenuation of the UHF signal inside the transformer, which is used to locate the partial discharge source inside the transformer, reflect the insulation status of the transformer and its development trend, and avoid insulation accidents.

[0077] It should be noted that, compared to pulse current detection, gas chromatography, and optical detection, the aforementioned UHF detection method can avoid the frequency band of interfering signals, carry a wider range of partial discharge information, and demonstrate strong anti-interference performance. The UHF sensor described in the present embodiment is composed of a broadband antenna optimized for the frequency range of partial discharge radiation, and its installation position is adapted to the transformer.

[0078] The monitoring terminal collects the partial discharge signal of the partial discharge monitoring sensor and displays the maximum partial discharge value of the transformer and the real-time value of the partial discharge in real time on the display screen, thereby providing a basis for monitoring personnel to determine the type and location of the fault, such as retrieving historical data, trend charts of the maximum partial discharge value, and alarming when exceeding the warning value.

[0079] Of course, mutual inductors can also be integrated inside the transformer to monitor the three-phase current and voltage values ​​of the transformer. In addition, other detection equipment can be integrated to monitor the three-phase active power, three-phase reactive power, power factor, daily average load, weekly average load, monthly average load, seasonal average load and annual average load of the transformer, so that the operating status of the transformer can be effectively monitored in real time, and faults such as transformer short circuit can be discovered at any time, helping monitoring personnel to deal with them at any time.

[0080] As an optional embodiment, the vibration monitoring sensor includes at least one of a velocity sensor, an acceleration sensor, and a displacement sensor.

[0081] It should be noted that the transformer described in the embodiment of the present invention may be a dry-type transformer, and the vibration signal on its surface is an electrical mechanical vibration signal. Therefore, the vibration monitoring sensor that can be used includes at least one of the above-mentioned acceleration sensor, velocity sensor, and displacement sensor. The monitoring terminal collects the vibration signal from the vibration monitoring sensor and displays the vibration amplitude, velocity, acceleration, etc. in real time on a display screen, thereby providing a basis for monitoring personnel to determine the type and location of the fault, such as retrieving historical data, trend graphs of vibration acceleration, and alarming when exceeding warning values.

[0082] Next, combine Figure 3 The structure of the transformer monitoring system described in the embodiment of the present utility model is described.

[0083] The monitoring terminal may further include a protocol conversion module, which may be an IEC61850 protocol conversion module. The communication management machine receives various monitoring information transmitted by each monitoring sensor, and converts the various monitoring information into optical signals through the protocol conversion module, which are then transmitted to the display screen via optical fiber for display.

[0084] As an optional embodiment, the communication management machine includes at least one of an Ethernet fiber optic interface, an RS485 interface, a relay interface, a switch interface, and an analog interface.

[0085] It is understood that the communication management machine includes multiple interfaces, including redundant interfaces, and the interface type can be at least one of the above. Specifically, the communication management machine can connect to the corresponding monitoring transmitter, monitoring collector, or monitoring sensor via the RS485 interface in accordance with the MODBUS communication protocol to read various monitoring sensor information.

[0086] In summary, the transformer monitoring system described in the embodiment of the present utility model integrates multiple monitoring sensors in the transformer. Accordingly, the monitoring terminal integrates a communication management machine, a monitoring transmitter, and a monitoring collector. It adopts a modular and combined structure, has the characteristics of flexible configuration and easy installation, and can monitor and warn of various short-circuit faults, abnormal insulation conditions, and discharge faults of the transformer in real time, greatly improving the reliability, safety and effectiveness of the transformer operation, and can be applied to the field of urban rail transit power supply.

[0087] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications are also within the scope of protection of the present invention.

Claims

1. A transformer monitoring system, characterized in that: The invention is applied to an urban rail transit power supply system, comprising: at least one monitoring terminal, each of which is connected to at least one transformer. When each of the monitoring terminals is connected to one of the transformers, the monitoring terminal is embedded in the housing of the transformer, or, when each of the monitoring terminals is connected to at least one of the transformers, the monitoring terminal is mounted on a wall, the wall is within a preset range from the transformer, and each of the monitoring terminals is connected to a display screen; The transformer includes at least one of the following monitoring sensors: Temperature monitoring sensors are provided on the coil and the core of the transformer; an arc monitoring sensor, arranged at an electrical connection point of the transformer; A temperature and humidity monitoring sensor is provided on the shell surface of the transformer; An environmental status monitoring sensor, used for monitoring the environmental status of the transformer; A fan status monitoring sensor, used to monitor whether the fan of the transformer is faulty; An outer shell door travel switch monitoring sensor is used to monitor the state of the outer shell door of the transformer; A mutual inductor, used to monitor the three-phase current and voltage values ​​of the transformer; The monitoring terminal includes: A communication management machine, connected to the display screen and the temperature and humidity monitoring sensor respectively; A temperature monitoring transmitter is connected to the communication management machine and the temperature monitoring sensor respectively; an arc light monitoring transmitter, connected to the communication management machine and the arc light monitoring sensor respectively; A protocol conversion module is connected to the communication management machine and the display screen respectively; Among them, the transformer monitoring system adopts fault prediction and health management PHM technology, and the temperature information of the transformer is collected in real time through the temperature monitoring sensor, the arc light monitoring sensor collects the instantaneous discharge arc light information of the transformer in real time, and the temperature and humidity monitoring sensor collects the temperature information and humidity information of the environment in which the transformer is located in real time and displays them on the display screen.

2. The transformer monitoring system according to claim 1, characterized in that: The temperature monitoring sensor is a fluorescent optical fiber temperature monitoring sensor; The temperature monitoring transmitter is connected to the temperature monitoring sensor via an optical fiber signal line.

3. The transformer monitoring system according to claim 1, characterized in that: The arc light monitoring sensor is arranged at the electrical connection point of the transformer coil.

4. The transformer monitoring system according to claim 1, characterized in that: The transformer further includes at least one of the following: A partial discharge monitoring sensor is arranged inside the transformer; a smoke monitoring sensor, disposed inside the transformer; A vibration monitoring sensor is provided on the shell surface of the transformer; A noise monitoring sensor is arranged on the shell surface of the transformer; The monitoring terminal further includes at least one of the following: A partial discharge monitoring collector is connected to the communication management machine and the partial discharge monitoring sensor respectively; The smoke monitoring collector is connected to the communication management machine and the smoke monitoring sensor respectively.

5. The transformer monitoring system according to claim 4, characterized in that: The partial discharge monitoring sensor is a UHF sensor.

6. The transformer monitoring system according to claim 4, characterized in that: The vibration monitoring sensor includes at least one of a velocity sensor, an acceleration sensor, and a displacement sensor.

7. The transformer monitoring system according to claim 1, characterized in that: The communication management machine includes at least one of an Ethernet optical fiber interface, an RS485 interface, a relay interface, a switch quantity interface and an analog quantity interface.

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