It's all the fault of the multimeter!

Multimeter is a very practical electrical instrument and a "magic weapon" for electrical fault diagnosis and troubleshooting. For many electricians, using a multimeter is handy. But we must pay attention to the use of multimeter, otherwise "jokes" will fall on an old electrician, which can be described as "capsizing in the gutter", making people lose their reputation and regret it ... Recently, the switch of a substation tripped. The alarm information is as follows: "500kV fifth string 5 153 protection screen tripping outlet I acts", "500kV fifth string 5 153 circuit breakers A, B and C split", "500kV fifth string 5 153 protection screen accident total action", and 500 kV bus differential protection A screen fails. The 500kV fault recording screen records the start of the fifth string of three-phase tripping displacement of 5 153 switch. By analyzing the cause of the accident, it was found that the operator (old electrician) mistakenly took the multimeter resistance file as the voltage file in the process of finding the low insulation fault of the circuit breaker screen and measuring the voltage of the outlet contact of the circuit breaker protection failure, which led to the short circuit of the outlet contact of the circuit breaker protection failure, and the contact was opened to the 500kV bus protection screen, which led to the failure protection start and the 5 153 switch trip.

Event handling process: (the cable was cut off and damaged in many places during construction) →→→→→→→→→→→→ The insulation of the circuit breaker screen is low →→→→→→→ The DC circuit insulation is abnormally reduced to give an alarm →→→→→ Troubleshooting → Mistakenly measuring the multimeter resistance file as a voltage file →→→→→→→→→→→→→→ The circuit breaker protection failed and the outlet contact was wrongly shorted →→→→→ Failure protection started →5 153 switch tripped. (/All rights reserved) can be described as a small action, which caused a big misoperation. This is a routine troubleshooting work of DC system, but there has been a problem in the simple link recently. We can't help asking: our safety regulations, work tickets and secondary measures are becoming more and more "strict and meticulous". Why can't we prevent and control the most basic violations? Ben is an experienced old electrician, but when using the most commonly used "multimeter", there was an "episode" and "the resistance range of the multimeter was wrongly measured as the voltage range", which misled the protection trip circuit and could not help but reflect: Is this a problem of technical skills or responsibility?

What we should think most is: As electricians, will we be so careless or careless? How to effectively avoid and prevent?

Once in the river's lake of power, there are many dangers and traps. Whether an old electrician or a novice, the most important thing is to keep the consciousness of "business risks are everywhere" at all times, keep a good mental state at all times, and keep in mind "be careful to sail a ship for thousands of years" Especially in the special period involving outsourcing defect handling, continuous operation and cross operation, the working ticket system should be strictly implemented. Professional departments and professionals in equipment management need to do professional supervision and guidance, and operators should do operational supervision and supervision, strengthen the management and control of operational risks, and prevent "unintentional" violations or even violations caused by "unknown" operators.