Integrated Electronic Module for Transformer Cooling Motor Control
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Solution Overview
Problem
Conventional systems for controlling and protecting forced cooling motors in power transformers require numerous external devices and manual adjustments, leading to increased costs, logistical difficulties, and lack of standardization, especially when dealing with multiple motors of different nominal currents.
Innovation Solution
An electronic module integrated directly onto the motor connections box, interconnected via a communication network to a computer system, enabling remote control, automatic thermal protection, and monitoring without external devices like relays or contactors, allowing for digital measurement and adjustment of current and voltage, and detection of overloading, underloading, and phase failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional thermal protection devices and contactors are used for each motor, then motor protection and control are achieved, but device complexity and production costs increase significantly
Solution Approach 1:
The patent combines thermal protection, motor control, and monitoring functions into a single integrated electronic module that replaces multiple separate devices (thermal relay/circuit breaker and contactor). This consolidation maintains comprehensive motor protection while significantly reducing the number of components required in the control panel, thereby resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The electronic module performs multiple functions simultaneously: it provides thermal protection through adjustable current monitoring, controls motor operation via solid-state switching, and monitors motor status. This multi-functional design eliminates the need for separate dedicated devices for each function, reducing overall system complexity while maintaining comprehensive protection capabilities.
2Reliability
If the number of thermal protection devices is increased to match the number of motors, then each motor receives adequate protection, but production costs and control panel size increase proportionally
Solution Approach 1:
Instead of installing one thermal protection device per motor, the patent uses a single electronic module that can protect multiple motors. This approach maintains comprehensive protection coverage for all motors while significantly reducing the total number of protection devices required, thereby lowering production costs and simplifying manufacturing.
Solution Approach 2:
The electronic module is designed as a universal protection device that can monitor and protect multiple motors simultaneously. Its multi-functional capability allows it to serve as both thermal protection and control device for several motors, eliminating the need for multiple dedicated devices and reducing overall system cost.
3Reliability
If electromechanical thermal protection devices with bimetallic blades are used, then motor thermal protection is provided, but adjustment range is narrow and standardization becomes difficult
Solution Approach 1:
The patent replaces the mechanical bimetallic blade system with an electronic monitoring and control system. This substitution enables continuous adjustable current monitoring with a wide adjustment range, allowing the same device to adapt to motors with different nominal currents. The electronic system provides precise control and monitoring capabilities that mechanical systems cannot achieve, thereby improving adaptability while maintaining reliable thermal protection.
4Ease of operation
If multiple contactors are used to control multiple motors, then each motor can be controlled independently, but control panel size and maintenance requirements increase
Solution Approach 1:
The patent integrates the control functions of multiple contactors into a single electronic module. This module provides independent control capability for multiple motors through solid-state switching, maintaining the ease of operation for motor control while dramatically reducing the physical size and component count of the control panel compared to using separate contactors for each motor.
Data Source
Figure 1
AI summary
System to control, protect and monitor the status of forced cooling motors for power transformers and similar, is preferably applied to power transformers and auto-transformers, and this system turns conventional (1) cooling motors into "intelligent" motors, operating in a totally autonomous manner, whose electronic module (2) is installed on the actual motor cover, more specifically on the connection box (3) and is interconnected by a communication network to a digital system (4) without the need to use any external control, protection and monitoring elements or exaggerated panels for functioning thereof.