08-12-24 21:00

Case Study II - Renovation Project of SIP (T1) Tester for Daya Bay NPP


Project Overview
The original T1 tester of Daya Bay NPP is aging and spare parts are not available any more. This makes the testing and maintenance work inconvenient. To develop an updated periodical test device has become an emergent issue. Thus CTEC introduced the concept of a virtual instrument to the simulation of SIP system and did the system design by using the computer simulation technology. In this way, CTEC cut down the time and cost during design and improved the quality at the same time. It finally finished the design of virtual simulation for the SIP system by means of LabVIEW.
Project Background
The original T1 tester of Daya Bay NPP was manufactured in the 1980s.
- Aging equipments and lack of spare parts have affected the normal periodical test function of the SIP system
- Can only do the protection channel test once a time and have no step test process
- The output signal is not isolated which may leave potential risks to the SIPsystem
- Unfriendly human-machine interface, slow printer response, no hard disk to store test results and difficult to modify program and data
- Small Memory, slow speed and weak data-processing
- Lack of functions such as fault analysis, data management, report management, on-site parameter calculation, etc. leads to the inconvenience of test and maintenance
- Need resistance boxes when carry out the ETY and RRA tests, which bring troubles to the periodical test
 Comparison of System Performance
- Accuracy of channels
The resolution is raised to 16bits and the total accuracy is better than 0.1%
- Compared with the original one
* Test results are the same
* Deviation is within 10mV
* Deviation of a few channels is within 20mV (Permitted deviation for the channels is 100mV)
- Compatible with the functions of the original one
- Much stronger in functions and performance
- Higher security
- Easier to use and maintain
 New Functions
To ensure the high reliability, the following functions were added while retaining the original functions:
- Signals to the tested channel sent by T1 tester are read back to check the accuracy of I/O modules
- Functions such as step test and on-site parameter calculation are added to facilitate test and maintenance
- Test equipments and target cabinets are electrically isolated
- Automatically detect the test loop is wrong or not
- Cables are more reliable, lighter and have a longer life and better anti-interference ability
- Simulated protection channels of hardware and software are built for the test to make the test devices more reliable
- Improved Human-machine interface and automatic data storage/printing to make the operation much easier




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