Although IT isolated power supply system has many advantages, there are also some disadvantages, which are mainly reflected in the following aspects:
1. Higher cost:
IT isolated power systems are typically more expensive to install and maintain than traditional TN or TT systems. This is mainly due to the fact that IT systems employ key components such as special isolation transformers and insulation monitoring equipment, which are more costly.
2. Increased Complexity:
The structure of an IT system is relatively complex, requiring a professional design and maintenance team to ensure its proper operation. This increases the complexity and difficulty of system construction and operation and maintenance, and also puts forward higher requirements for the professional level of operation and maintenance personnel.
3. Strict monitoring requirements:
In order to ensure the safe operation of IT systems, regular insulation monitoring and ground fault location are required. This increases the administrative burden and requires additional monitoring equipment and manpower inputs.
4. High requirements for the insulation level of electrical circuits and electrical equipment:
In IT systems, when one phase is grounded, the other two will increase relative to low voltage, so the insulation level of electrical circuits and electrical equipment is required. This requires that when selecting electrical equipment and materials, their insulation properties must be fully considered to ensure the safe and stable operation of the system.
5. Neutral Limit:
The IT system is not allowed to lead out the neutral wire, because in the event of a neutral ground fault, the insulation monitor cannot give an alarm, and the system may become a TT or TN system, which will cut off the power supply in the event of a phase ground fault, with serious consequences. This limitation poses certain challenges to the design and operation of the system.
6. Limited scope of application:
Although IT systems offer significant advantages in locations with high security requirements, their scope of application is relatively limited. Due to higher costs and increased complexity, IT systems may not be suitable for all locations that require power. When choosing a power supply system, it is necessary to consider it comprehensively according to the specific needs and actual conditions.
In summary, Tianjin IT isolated power supply system has significant advantages in providing high security and continuous power supply, but it also has disadvantages such as high cost, increased complexity, and strict monitoring requirements. In practical application, it is necessary to comprehensively consider and select according to specific needs and actual conditions.