High-voltage motor non-electric quantity protection measurement and control device and protection measurement and control method

Abstract

The invention relates to a high-voltage motor non-electric quantity protection measurement and control device and a protection measurement and control method. In the prior art, no systematic non-electric quantity protection measure exists, especially effective measurement and control are carried out on vibration of a bearing, operation sound, the temperature of a wiring terminal of a junction box and the like, and the safety and reliability of long-term operation of a motor cannot be guaranteed. The device comprises display terminals (2), the number of the display terminals and the number of on-site terminals (3) are respectively a group, the display terminals and the on-site terminals are in one-to-one correspondence, each display terminal and each on-site terminal respectively have a unique address code, and a control terminal (1) is connected with the display terminals and the on-site terminals through the unique address codes and transmits instructions or data. The control terminal is sequentially connected with the group of display terminals and the group of local terminals through a relay I2C bus A (4) and a relay I2C bus B (5) respectively, and the control terminal is connected with the remote distributed control system through an RS485 bus (6). The invention is used for the high-voltage motor non-electric quantity protection measurement and control device.

Description

technical field [0001] The invention relates to the technical field of electrical equipment, in particular to a high-voltage motor non-electrical protection measurement and control device and a protection measurement and control method. Background technique [0002] Thermal power plants account for about 75% of my country's power generation industry. The difference from other types of power generation companies is that thermal power plants have a large number of auxiliary machines. The position is becoming more and more important. Once a fault occurs, it will cause load reduction, and the serious one will cause the unit to trip, causing a serious impact on the power grid, affecting the safe operation of the power grid and the economic benefits of the power plant. Therefore, it is directly important for the safe and reliable operation of auxiliary equipment. Related to the safe operation of power plants and grids; [0003] It is very important for the safe and reliable operati...

AI Technical Summary

Problems solved by technology

[0004] Although electrical protection has a perfect method of "protecting oneself" and "protecting others", there are many situations where electrical protection cannot be achieved. For example, if the operator finds that the motor is abnormal due to non-electrical reasons during the inspection, he can press the emergency button , stop the operation of the motor to avoid further expansion of the accident and cause more serious damage to the motor or the system, so the accident button has become the last line of defense for the motor; but even this last line of defense is not absolutely safe and reliable; the accident button is divided into: normally open contact button And the normally closed contact button, the normally open contact button does not have the ability to monitor the control circuit during normal operation. Once the control circuit is disconnected, the emergency button will fail. Pressing the emergency button at a critical time will not work, and the faulty motor cannot be cut off; The closed contact button has the ability to monitor the control circuit during normal operation, but this ability is based on "misoperation". Once the control circuit is disconnected or the button shakes, the motor will trip, although the control circuit can be fully reflected. Integrity, but a "misoperation" will cause serious economic losses to the unit, especially now that the capacity of the unit is increasing, the loss of "misoperation" is unbearable for the power plant; in addition, whether it is a normally open contact Both the button and the normally closed contact button have a reality, that is: the general auxiliary machine is far away from the 6kV busbar room, ranging from tens of meters to hundreds of meters, or even hundreds of meters. The reliability of such a long cable connected to a button It is relatively poor, so in order to improve reliability and weigh the pros and cons of the accident button, the design institute no longer regards the design of the accident button as a mandatory option, and even some power plants directly cancel the existing accident buttons, just because they are afraid of these accident buttons " cause trouble", but the cancellation should not be blind, the premise of no accident button is that the motor should have reliable and perfect protection;

[0005] Now the level of automation in power plants is getting higher and higher, and the number of operating personnel is less and less. "Inspection" has gradually become a concept in power plants. What replaces the operator's inspection is the advanced level of automation and perfect protection functions; Electrical protection is relatively complete and mature, and can effectively "protect yourself" and "protect others", but non-electrical monitoring and protection have not kept up with "technical" progress, such as: bearing (tile) vibration, running sound, junction box wiring The temperature of the column, etc.; the main reason is very embarrassing. In the motor manufacturer, the focus of work is the electrical and mechanical properties of the motor. As for the protection of the motor, it is not the focus of attention. In recent years, the capacity of a single machine has become larger and larger. , the user puts forward the requirements for the temperature monitoring of the motor winding, and the motor manufacturer installs the temperature measuring element in the motor winding. The electrical major is responsible for the design. These non-electrical measurement and control, which have nothing to do with electricity, are designed by thermal control. At most, the access point is designed for the temperature measurement components provided by the motor manufacturer. They are all technically responsible by non-electrical (thermal control) professionals. First, due to industry restrictions, the thermal control major cannot understand the technical essentials and status of the electrical major. In the thermal control major, electrical is marginalized, so these measurement points are isolated There is no systematic concept of "non-electricity" protection. Although the electrical profession knows the importance of these non-electricity, it is also due to professional limitations. It is natural to think that these are responsible for thermal control, which leads to the basic concept of motor non-electricity protection. It is equivalent to the understanding of "temperature measuring point"; as the level of automation continues to increase, the work intensity of operators can be reduced, and the protection of the motor can be improved to ensure that the motor can be reliably warned or tripped when the motor has abnormal electrical or non-electrical quantities. To ensure the final protection of the motor - after the accident button is canceled, the safe, reliable and long-term operation of the motor requires an urgent need for a high-voltage motor non-electrical measurement and control protection device

Images