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Most factories are unwilling to accept unscheduled downtime, but some factories are strictly unable to plan unplanned shutdowns.
For Singapore Petrochemical Company (PCS), it must be 365 days per year, 7 x 24 hours without failure and continuous production - there is no choice. A large power trip or power outage will interrupt production for a maximum of 4 days, and it is estimated that the daily cost is $2 million.
To prevent downtime, Mr. Tan Khai Meng, PCS's electrical maintenance engineer, relied completely on sophisticated test tools of various functions and was combined with good test methods, regular measurements and training.
The interlocking production process Singapore's economic development can be traced back to the 1960s and 1970s, when the refinery became the backbone of the country's independence. Although the current situation is different, these industries still continue to make great contributions.
Nearly all of Singapore’s refinery production activities take place in a high-security area on the offshore islands. This island is generally known as Jurong’s Island.
PCS is one of the main tenants of the island. It provides high quality ethylene, propylene, acetylene, and butadiene, as well as basic public materials such as water, steam, and compressed air - all of which are key components of subsequent processing.
The suspension of any link in the joint venture will soon spread to a wide range of companies and customers in the value chain. As Tan explained: “Even if I solve the main problem, there may be minor issues that may involve restarting all machines, discarding all semi-finished products, and other power interruptions due to a certain period of time. The danger caused."
In order to prevent such incidents from happening, the factory will carry out large-scale "stop-work maintenance" every 4 to 5 years, monitor key equipment, and immediately handle any abnormal phenomena.
The device under test facility is equipped with countless 6-pulse rectifier circuits that convert AC power to DC voltage to charge the battery and power the uninterruptible power supply (UPS). For redundancy purposes, these chargers and UPSs are configured in pairs (see Figure 1). 
In the past, technicians had to use the cart to bring the following test equipment to the job site:
Bench oscilloscope
Isolation transformer (for safety purposes, provide ground isolation);
Benchtop oscilloscope hood and a conventional camera.
Now they use the Fluke 192 ScopeMeterTM oscilloscopes that are actually isolated between the input channels and between the input channels and the ground. The electrical maintenance department also has a Fluke-434 power quality analyzer and is testing the RPM1650 power quality analyzer.
accident report 
In an accident, the monitoring alarm warned Tan's team that a low voltage appeared on the 440V DC power supply. One charger in parallel does not provide current. As the second charger was suspended, production could not continue, so his team isolated the faulty equipment from the circuit and began testing to determine the cause of the failure. The first round of testing showed that the failed charger had no output current and had high ripple on the output voltage (see Figure 2). Further inspections track ripples and locate two open-circuit thyristors in the rectifier circuit. 
Tan's team replaced the faulty thyristor and tested it again. The ripple on the charger dropped from 4V to 0.5V (see Figure 3). As a result, they re-powered the charger unit and connected him to work in parallel.
Continuous monitoring showed no further voltage drop, indicating that the fault was due to the faulty device of the thyristor, rather than a system problem such as excessive current. After clarifying this issue, Tan purchased another thyristor as a backup.
Analysis To evaluate its reading, Tan's team used the oscilloscope to archive, save, and download known good waveforms and fault waveforms. This unique reference library can be stored as an online resource or printed out as a reference document.
When creating the reference library, first determine the appropriate test point on the known good device (KGU), such as a repaired charger. Run KGU to capture the waveform of each node. Annotate the waveform if necessary. When the system fails, the waveform is captured from the failed system and compared with the stored KGU waveform. In the above example, if the waveform generated by the faulty thyristor is known, the test and replacement process can be accelerated.
Training and Development Tan firmly believes that Fluke's instruments can achieve better return on investment, provide them with reliability, and emphasize safety. He also appreciates the consistency of Fluke products, comprehensive training materials, and product upgrade information. "For us, it is very important that Fluke provides the service." Tan said: "Fluke is bundled with the equipment with very good training materials and technical support, so we do not have to reinvest for further training." These materials have Helped his team become familiar with testing techniques and use Fluke test tools more effectively.
Application of ScopeMeter Scope in Petrochemical Production
The suspension of any link in the joint venture will soon spread to a wide range of companies and customers in the value chain. In order to prevent such incidents from happening, the factory will conduct large-scale "stop-work maintenance" every 4 to 5 years, detect key equipment, and immediately handle any abnormal phenomena. Stable DC voltage is critical for the continuous operation of engineering equipment. The DC voltage is also used to provide power for switching devices that are activated during equipment failure. The technician constantly monitors these DC voltages and records the readings on the panel meter. When the DC voltage reading fluctuates, it is necessary to use an oscilloscope to check the voltage waveform across the capacitor, the voltage across the rectifier's anode and cathode (>500V), and the gated waveform (10V peak to peak). Gated signal and rectifier voltage are not common ground.