ABB TMM-700 Trip Monitor

ABB TMM-700 Trip Monitor

Overview of Turbine Protection System

Function: It is mainly used to monitor and process the signals related to turbine protection, and trigger the corresponding tripping action in case of abnormality, so as to protect the safe operation of turbine and its related equipments.

Application Scenario: Widely used in thermal power plants, nuclear power plants and other industrial fields where the turbine is the main power equipment, and it is one of the key components to ensure the stable and reliable operation of the turbine generator set.

Working Principle

Signal acquisition and processing: It can receive signals from various sensors, such as temperature sensors, pressure sensors, vibration sensors, etc., and carry out real-time acquisition and digital processing of these signals, and convert analog signals into digital signals for subsequent analysis and judgement.

Logical judgement and tripping decision: according to the preset protection logic and threshold, the collected signals are comprehensively analysed and logically judged. When the monitored parameters exceed the set safety thresholds or abnormal changes occur, the module will quickly make a tripping decision and send a tripping signal to the corresponding control equipment in order to cut off the steam feed to the turbine or other power sources and prevent equipment damage or accident expansion.

Communication and Condition Monitoring: Equipped with communication function, the module can communicate with other control systems or monitoring devices, and transmit its working status, monitoring data and tripping events in real time to the host computer or monitoring centre, so that the operators can understand the running condition and fault information of the equipment in time. At the same time, it can also receive control instructions and parameter settings from the host computer to achieve remote monitoring and management.

Performance characteristics

High reliability: It adopts advanced electronic components and manufacturing process, has good anti-interference ability and stability, and can run stably for a long time under the harsh industrial environment. In addition, it also has redundant design and fault self-diagnosis function, when a fault occurs, it can send out an alarm signal in time, and automatically switch to the backup channel or take corresponding fault-tolerant measures to ensure the reliability and continuity of the system.

Fast Response: It can respond to changes in monitoring signals in a very short time, quickly detect abnormalities and trigger tripping action, the response time is usually within milliseconds, which effectively protects the safety of the equipment.

High-precision Measurement: High precision measurement of the input signals can accurately monitor the changes of various physical quantities, providing reliable data support for the accurate judgement of the protection logic, and the measurement precision can reach ±0.1% or higher.

Flexible Configuration: Supporting a variety of different types of sensors and communication protocols, the user can be flexibly configured according to the actual needs of the user, and convenient to integrate with the equipment and systems of different manufacturers, with strong versatility and compatibility.

Technical parameters

Input signal type: It can accept a variety of analogue signal inputs, such as 4-20mA current signals, 0-5V or 0-10V voltage signals, etc. It also supports digital signal inputs to meet the signal access requirements of different sensors and monitoring devices.

Number of Input Channels: Usually it has multiple input channels to monitor multiple physical quantities at the same time, and the number of channels is generally 8, 16, etc., and the specific number can be different according to different models and configurations.

Measurement accuracy: For analogue signal input, the measurement accuracy can reach ±0.1% FS (full scale) or higher; for digital signal input, the accuracy depends on the encoding method and transmission accuracy of the signal.

Trip output signal: The output trip signal is a digital signal, usually a dry contact signal, which can directly drive the relay or other control devices to achieve the trip action. The trip output has enough driving ability to reliably trigger the action of external devices.

Communication interface: It supports various communication protocols, such as Profibus DP, Modbus RTU, HART, etc. The communication rate can be set according to the user's requirements, and the highest communication rate can reach about 12Mbps, which is convenient for data communication with the upper computer, PLC or other control systems.

Power supply: DC 24V power supply is generally used, the permissible range of power supply voltage fluctuation is ±15%, and the power consumption is low, usually between a few watts and a dozen watts, to ensure stable and reliable operation in the industrial field.

Installation and Maintenance

Installation requirements: It should be installed in a dry, well-ventilated, vibration-free control cabinet to avoid electromagnetic interference and high temperature, high humidity and other harsh environments. Installation should be in strict accordance with the product manual and relevant standards to ensure that the connection between the module and other equipment is firm and reliable, and well grounded.

Maintenance points: Regular inspection and maintenance of the module, including checking whether the connecting wires are loose, whether there is dust accumulation on the surface of the module, and whether the cooling fan operates normally. It is also necessary to calibrate and verify the sensor regularly to ensure the accuracy of the measurement data. If the module is found to be faulty, it should be replaced or repaired in time to ensure the normal operation of the turbine protection system .