Transformer loss on-line monitoring system

Abstract

The utility model discloses a transformer loss on-line monitoring system which comprises one end of a first voltage transformer and a first pin of a first current transformer which are respectively connected with a high-voltage line, a third pin of the first current transformer is connected with one end of a transformer, and the other end of the transformer is connected with a first pin of a second current transformer. A third pin of the second current transformer is respectively connected with a plurality of low-voltage lines and one end of the second voltage transformer; the first voltage transformer and the first current transformer in the device are located on the high side of power distribution, the second voltage transformer and the second current transformer are located on the low side of power distribution, the alternating current and the alternating voltage are detected while electrical quantity data are collected, and the collected information is transmitted to the on-line no-load loss measuring device. The on-line no-load loss measuring device transmits a monitoring result to the DCS cabinet, and then the DCS cabinet transmits detected information to the monitoring end, thereby realizing on-line monitoring of the voltage loss of the transformer.

Description

Technical Field

[0001] The utility model belongs to the technical field of voltage monitoring, and particularly relates to an on-line monitoring system for transformer losses. Background Art

[0002] With the development of the national economy, the requirements for the reliable operation of the power system are getting higher and higher. Power transformers are key equipment in the power grid. During operation, transformers are subject to various types of overvoltages. Detecting the overvoltages borne by transformers is a key measure for studying the insulation characteristics of transformers and protecting transformers against overvoltages.

[0003] During long-term operation, transformers are prone to failures and accidents. Since there are many reasons for transformer failures and accidents, it is more urgent and important to correctly diagnose and predict faults early. Therefore, it is necessary to detect transformers, and at the same time, it is necessary to transmit the detected data to operators, so as to facilitate the operators to monitor and maintain them. Furthermore, it is necessary for the operators to be able to monitor the transformer voltage in real time.

[0004] Therefore, how to complete the on-line monitoring of transformers is a problem to be solved at present. Summary of the Utility Model

[0005] Utility Model Objective: To provide an on-line monitoring system for transformer losses to solve the above problems existing in the prior art.

[0006] Technical Solution: An on-line monitoring system for transformer losses includes:

[0007] Transformer body T, first voltage transformer PT1, second voltage transformer PT2, first current transformer CT1, second current transformer CT2, on-line no-load loss measurement device, storage cloud module and monitoring end module;

[0008] Wherein, the high-voltage line is respectively connected to one end of the first voltage transformer PT1 and the first pin of the first current transformer CT1. The third pin of the first current transformer CT1 is connected to one end of the transformer. The other end of the transformer is connected to the first pin of the second current transformer CT2. The third pin of the second current transformer CT2 is respectively connected to a plurality of low-voltage lines and one end of the second voltage transformer PT2;

[0009] Wherein, the other end of the first voltage transformer PT1, the other end of the second voltage transformer PT2, the second pin of the first current transformer CT1 and the second pin of the second current transformer CT2 are respectively connected to the on-line no-load loss measurement device;

[0010] The storage cloud module is connected to the on-line no-load loss measurement device for receiving the information transmitted by the on-line no-load loss measurement device;

[0011] The monitoring end module is connected to the storage cloud module through an optical cable and receives the data transmitted by the storage cloud module;

[0012] During operation, a current transformer and a voltage transformer are used to measure the high-voltage end and the low-voltage end of the transformer respectively, thereby realizing the detection of the voltage loss of the transformer.

[0013] In a further embodiment, the on-line no-load loss measuring device includes a current-voltage monitor (INA226) respectively connected to a first voltage transformer, a second voltage transformer, a first current transformer and a second current transformer, a micro-control unit connected to the current-voltage monitor, and a DCS cabinet connected to the micro-control unit.

[0014] In a further embodiment, the on-line no-load loss measuring device further includes an on-line monitoring module;

[0015] The on-line monitoring module includes an independent power supply and a communication interface; the on-line monitoring module is a prior art.

[0016] In a further embodiment, the DCS cabinet includes a CPU module, a redundant switch, a Modbus communication module, a power supply module, an I / O module and a gateway respectively connected to the CPU module;

[0017] The communication interface is connected to the CPU module through a connecting wire.

[0018] In a further embodiment, an installation component is further included in the DCS cabinet;

[0019] The installation component includes a placement seat arranged in the DCS cabinet and three limiting parts arranged on the placement seat;

[0020] A placement cavity is formed on the placement seat, the power supply module is located in the placement cavity, and the limiting parts are in contact with the shell of the power supply module.

[0021] In a further embodiment, the limiting part includes a connecting shaft arranged on the placement seat, a limiting block movably connected to the connecting shaft, a connecting block movably connected to the limiting block, a connecting rod connected to the connecting block, and a driving handle connected to the connecting rod;

[0022] The connecting rod is screwed to the placement seat.

[0023] Beneficial effects: The present utility model relates to an on-line monitoring system for transformer losses. In order to realize the remote monitoring of the transformer voltage, the device is provided with a transformer body T, a first voltage transformer PT1, a second voltage transformer PT2, a first current transformer CT1, a second current transformer CT2, an on-line no-load loss measuring device, a storage cloud module and a monitoring terminal module. Further, through the first voltage transformer PT1, the second voltage transformer PT2, the first current transformer CT1 and the second current transformer CT2, wherein the first voltage transformer PT1 and the first current transformer CT1 are located on the high side of the distribution, and the second voltage transformer PT2 and the second current transformer CT2 are located on the low side of the distribution. Thus, it is possible to detect the induced current and induced voltage while collecting the electrical quantity data, and transmit the collected information to the on-line no-load loss measuring device. Then, with the cooperation of the current and voltage monitor and the micro-control unit, the detected information can be transmitted through the RS-485 communication protocol, the RTM protocol (i.e., the real-time communication protocol) and the Modbus (i.e., the serial communication protocol). Thus, the information can be transmitted to the DCS cabinet (i.e., the distributed control cabinet), and then through the gateway in the DCS cabinet, the data can be transmitted to the storage cloud. Then, the monitoring terminal monitors the uploaded data, and thus it is possible to realize the real-time monitoring of the transformer voltage, enabling the staff to timely discover the damage of the transformer and facilitating the maintenance and replacement of the damaged transformer by the staff. At the same time, through the independent power supply in the on-line monitoring, when the transformer is damaged, the independent power supply serves as the external power supply for the on-line monitoring module of the DCS cabinet, enabling the DCS cabinet to send a signal to the monitoring terminal, facilitating the staff to timely repair the transformer. Description of the Drawings

[0024] Figure 1 It is the system network topology diagram of the present utility model.

[0025] Figure 2 It is the measuring circuit diagram of the on-line no-load loss measuring device in the present utility model.

[0026] Figure 3 It is the schematic diagram of the on-line no-load loss measuring device in the present utility model.

[0027] Figure 4 It is the schematic diagram of the installation component in the present utility model.

[0028] Figure 5 It is the schematic diagram of the limiting part in the present utility model.

[0029] The reference numerals in the figures are as follows: placement base 1, placement cavity 2, limiting part 3, connecting shaft 31, limiting block 32, connecting block 33, connecting rod 34, driving handle 35, transformer body T, first voltage transformer PT1, second voltage transformer PT2, first current transformer CT1, second current transformer CT2. Detailed implementation manners

[0030] Through the applicant's research and analysis, the reason for this problem (how to complete the on-line monitoring of transformers) is that during long-term operation, transformers are prone to failures and accidents. Since there are many reasons for transformer failures and accidents, correct diagnosis and early prediction of faults are of greater urgency and importance. Therefore, it is necessary to detect transformers, and at the same time, the detected data needs to be transmitted to the operator, so as to facilitate the operator's monitoring and maintenance work. Furthermore, it is necessary for the operator to be able to monitor the transformer voltage in real time. In order to achieve the remote monitoring of the transformer voltage in this utility model, the transformer body T, first voltage transformer PT1, second voltage transformer PT2, first current transformer CT1, second current transformer CT2, on-line no-load loss measurement device, storage cloud module and monitoring end module are set in this device; furthermore, through the set first voltage transformer PT1, second voltage transformer PT2, first current transformer CT1 and second current transformer CT2, where the first voltage transformer PT1 and the first current transformer CT1 are located on the high side of the distribution, and the second voltage transformer PT2 and the second current transformer CT2 are located on the low side of the distribution. Furthermore, it is possible to detect the sympathetic current and sympathetic voltage while collecting electrical quantity data, and transmit the collected information to the on-line no-load loss measurement device. Then, with the cooperation of the current and voltage monitor and the micro-control unit, the detected information can be transmitted through the RS-485 communication protocol, RTM protocol (i.e., real-time communication protocol) and Modbus (i.e., serial communication protocol). Furthermore, the information can be transmitted to the DCS cabinet (i.e., distributed control cabinet), and then through the gateway in the DCS cabinet, the data can be transmitted to the storage cloud. Then, the uploaded data is monitored through the monitoring end, and thus the real-time monitoring of the transformer voltage can be achieved, enabling the staff to timely discover the damage of the transformer and facilitating the maintenance and replacement of the damaged transformer by the staff.

[0031] A transformer loss on-line monitoring system, comprising: placement base 1, placement cavity 2, limiting part 3, connecting shaft 31, limiting block 32, connecting block 33, connecting rod 34, driving handle 35, transformer body T, first voltage transformer PT1, second voltage transformer PT2, first current transformer CT1, second current transformer CT2.

[0032] The device includes a transformer body T, a first voltage transformer PT1, a second voltage transformer PT2, a first current transformer CT1, a second current transformer CT2, an on-line no-load loss measurement device, a storage cloud module and a monitoring terminal module; wherein the high-voltage line is respectively connected to one end of the first voltage transformer PT1 and the first pin of the first current transformer CT1, the third pin of the first current transformer CT1 is connected to one end of the transformer, the other end of the transformer is connected to the first pin of the second current transformer CT2, and the third pin of the second current transformer CT2 is respectively connected to a plurality of low-voltage lines and one end of the second voltage transformer PT2; wherein, the other end of the first voltage transformer PT1, the other end of the second voltage transformer PT2, the second pin of the first current transformer CT1 and the second pin of the second current transformer CT2 are respectively connected to the on-line no-load loss measurement device; the storage cloud module is connected to the on-line no-load loss measurement device for receiving the information transmitted by the on-line no-load loss measurement device; the monitoring terminal module is connected to the storage cloud module through an optical cable for receiving the data transmitted by the storage cloud module; during operation, the high-voltage side and the low-voltage side of the transformer are respectively measured by using the current transformer and the voltage transformer, so as to realize the detection of the voltage loss of the transformer; by setting the first voltage transformer PT1, the second voltage transformer PT2, the first current transformer CT1 and the second current transformer CT2, wherein the first voltage transformer PT1 and the first current transformer CT1 are located on the high side of the distribution, while the second voltage transformer PT2 and the second current transformer CT2 are located on the low side of the distribution, it is possible to detect the induced current and induced voltage while collecting the electrical quantity data, and transmit the collected information to the on-line no-load loss measurement device, and then with the cooperation of the current and voltage monitor and the micro-control unit, the detected information can be transmitted through the RS-485 communication protocol, the RTM protocol (i.e., the real-time communication protocol) and the Modbus (i.e., the serial communication protocol), and then the information can be transmitted to the DCS cabinet (i.e., the distributed control cabinet), so that through the gateway in the DCS cabinet, the data can be transmitted to the storage cloud, and then the uploaded data can be monitored through the monitoring terminal, so as to realize the real-time monitoring of the voltage of the transformer, enabling the staff to timely discover the damage of the transformer and facilitating the maintenance and replacement of the damaged transformer by the operator.

[0033] Embodiment 1: The online no-load loss measurement device includes a current-voltage monitor, i.e., INA226, which is respectively connected to a first voltage transformer, a second voltage transformer, a first current transformer, and a second current transformer, a micro-control unit, i.e., MCU, connected to the current-voltage monitor, and a DCS cabinet connected to the micro-control unit; through the provided current-voltage monitor, i.e., INA226, the micro-control unit MCU, and through the RS-485 communication protocol, RTM communication protocol, and Modbus communication protocol, the data detected by the first voltage transformer, the second voltage transformer, the first current transformer, and the second current transformer can be transmitted to the DCS cabinet, and then the data upload is completed through the provided DCS cabinet, so that the operator can perform real-time monitoring of the data through the monitoring terminal.

[0034] Embodiment 2: The online no-load loss measurement device further includes an online monitoring module; the online monitoring module includes an independent power supply and a communication interface; the DCS cabinet can not only be powered by using wires, but also has a power module and an independent power supply inside the DCS cabinet. When the transformer is damaged, the independent power supply serves as the external power supply for the online monitoring module of the DCS cabinet, so that the DCS cabinet can send a signal to the monitoring terminal, facilitating the staff to repair the transformer in time. When the transformer is damaged, the DCS cabinet can also send a signal to the monitoring terminal to ensure the normal operation of the DCS cabinet.

[0035] Embodiment 3: The DCS cabinet includes a CPU module, a redundant switch, a Modbus communication module, a power module, an I / O module, and a gateway respectively connected to the CPU module; the communication interface is connected to the CPU module through a connecting wire.

[0036] In a further embodiment, by detecting the high-voltage end of the line and the high-voltage end of the line, and through the cooperation of the provided INA226, MCU, RS-485 module, CPU module, etc., the detection information can be transmitted to the Modbus communication module. At the same time, through at least two networks connecting the CPU module and the redundant switch, corresponding information can be transmitted to the monitoring terminal, thereby completing the monitoring of the transformer voltage. At the same time, the monitoring terminal can also be connected to the printer through a local area network or a line, so that the information can be printed.

[0037] The DCS cabinet further includes a mounting assembly; the mounting assembly includes a placing seat 1 arranged in the DCS cabinet and three limiting parts 3 arranged on the placing seat 1; a placing cavity 2 is formed on the placing seat 1, the power module is located in the placing cavity 2, and the limiting parts 3 are in contact with the shell of the power module; the limiting part 3 includes a connecting shaft 31 arranged on the placing seat 1, a limiting block 32 movably connected to the connecting shaft 31, a connecting block 33 movably connected to the limiting block 32, a connecting rod 34 connected to the connecting block 33, and a driving handle 35 connected to the connecting rod 34; the connecting rod 34 is screwed to the placing seat 1; when the power supply is damaged and needs to be replaced, the driving handle 35 can be rotated at this time, so that the connecting rod 34 moves towards the bottom of the placing seat 1, and then relative displacements occur between the connecting block 33 and the limiting block 32 and between the limiting block 32 and the connecting shaft 31, so that the limiting block 32 moves away from the surface of the power module, and then the replacement work of the power module can be completed. There is no need to carry out installation work through bolts or screws or fasteners, improving work efficiency.

[0038] In a further embodiment, the first voltage transformer PT1, the second voltage transformer PT2, the first current transformer CT1 and the second current transformer CT2 in the present device are in a deeply integrated manner and integrated into the transformer interior. The electronic transformers are used to collect signals. They are small in volume and easy to dissipate heat, so that they can be applied in different environments. At the same time, through the sampling work on the high and low sides, the loss of the transformer, that is, the on-line loss measurement, can be measured in real time, and the collected data is uploaded to the cloud that meets the background requirements; at the same time, a DCS cabinet is installed beside the transformer, so that the data transmission can be completed and the remote monitoring of the data can be completed. And there are also devices such as cooling fans in the DCS cabinet that can adjust the temperature in the DCS cabinet.

[0039] Working principle description: Through the set first voltage transformer PT1, second voltage transformer PT2, first current transformer CT1 and second current transformer CT2, where the first voltage transformer PT1 and the first current transformer CT1 are located on the high side of the distribution, while the second voltage transformer PT2 and the second current transformer CT2 are located on the low side of the distribution. Thus, it can detect the sympathetic current and sympathetic voltage while collecting electrical quantity data, and transmit the collected information to the on-line no-load loss measurement device. Then, with the cooperation of the current and voltage monitor and the micro-control unit, the detected information can be transmitted through the RS-485 communication protocol, RTM protocol (i.e., real-time communication protocol) and Modbus (i.e., serial communication protocol). Thus, the information can be transmitted to the DCS cabinet (i.e., distributed control cabinet), and then through the gateway in the DCS cabinet, the data can be transmitted to the storage cloud. Then, the uploaded data is monitored through the monitoring terminal, and thus the real-time monitoring of the voltage of the transformer can be realized, enabling the staff to timely discover the damage of the transformer and facilitating the maintenance and replacement of the damaged transformer by the operator; when the power supply needs to be replaced due to damage, the driving handle 35 can be rotated at this time, so that the connecting rod 34 moves towards the bottom of the placing seat 1, and thus relative displacement occurs between the connecting block 33 and the limiting block 32 and between the limiting block 32 and the connecting shaft 31, so that the limiting block 32 moves away from the surface of the power supply module, and thus the replacement work of the power supply module can be completed without the need for installation work through bolts, screws or fasteners, improving work efficiency.

[0040] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation of the present invention itself. Various changes can be made in its form and details without departing from the spirit and scope of the present invention defined by the appended claims.

Claims

1. A transformer loss online monitoring system, characterized in that: include: Transformer body, first voltage transformer, second voltage transformer, first current transformer, second current transformer, online no-load loss measurement device, storage cloud module and monitoring terminal module; The high-voltage line is respectively connected to one end of the first voltage transformer and the first pin of the first current transformer, the third pin of the first current transformer is connected to one end of the transformer, the other end of the transformer is connected to the first pin of the second current transformer, and the third pin of the second current transformer is respectively connected to multiple low-voltage lines and one end of the second voltage transformer; Wherein, the other end of the first voltage transformer, the other end of the second voltage transformer, the second pin of the first current transformer and the second pin of the second current transformer are respectively connected to the online no-load loss measurement device; The storage cloud module is connected to the online no-load loss measurement device and is used to receive information transmitted by the online no-load loss measurement device; The monitoring terminal module is connected to the storage cloud module via an optical cable and receives data transmitted by the storage cloud module; During operation, the high voltage end and low voltage end of the transformer are measured respectively by using a current transformer and a voltage transformer, thereby realizing the detection of the transformer voltage loss.

2. The transformer loss online monitoring system according to claim 1 is characterized in that: The online no-load loss measuring device comprises a current and voltage monitor connected to the first voltage transformer, the second voltage transformer, the first current transformer and the second current transformer respectively, a micro control unit connected to the current and voltage monitor, and a DCS cabinet connected to the micro control unit.

3. A transformer loss online monitoring system according to claim 2, characterized in that: The online no-load loss measurement device also includes an online monitoring module; The online monitoring module includes an independent power supply and a communication interface.

4. The transformer loss online monitoring system according to claim 3 is characterized in that: The DCS cabinet includes a CPU module, a redundant switch, a Modbus communication module, a power module, an I / O module and a gateway respectively connected to the CPU module; The communication interface is connected to the CPU module via a connecting line.

5. The transformer loss online monitoring system according to claim 4 is characterized in that: The DCS cabinet also includes a mounting assembly; The installation assembly includes a placement seat arranged in the DCS cabinet, and three limit parts arranged on the placement seat; The placement seat is provided with a placement cavity, the power module is located in the placement cavity, and the limiting portion abuts against the shell of the power module.

6. A transformer loss online monitoring system according to claim 5, characterized in that: The limiting part includes a connecting shaft arranged on the placement seat, a limiting block movably connected to the connecting shaft, a connecting block movably connected to the limiting block, a connecting rod connected to the connecting block, and a driving handle connected to the connecting rod; The connecting rod is screwed to the placement seat.

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