What safety measures does the box type substation take to prevent electric shock?
Publish Time: 2024-12-11
As a key facility for power transmission and distribution, the safe operation of the box type substation is of vital importance, and it has multiple strict defense lines to prevent electric shock.
First of all, a complete grounding system is the core guarantee for the box type substation to prevent electric shock. It reliably connects the metal shell, frame and non-live metal parts of the box type substation and the earth, so that the leakage current can be quickly introduced into the earth. The grounding resistance is usually strictly controlled below the specified value, for example, it is generally required not to exceed 4 ohms. In this way, when a leakage fault occurs in the equipment, when the human body touches the equipment shell, since the grounding resistance is much smaller than the human body resistance, most of the current will flow into the earth through the grounding system, thereby greatly reducing the risk of electric shock to the human body.
Secondly, the layout and insulation design of electrical equipment in the box type substation are very critical. A sufficient safety distance is maintained between the high and low voltage switch cabinets, and high-quality insulating materials are used to isolate and encapsulate the live parts. For example, the high-voltage busbar is wrapped with an insulating sleeve, and the live contacts and terminals in the switch cabinet are equipped with special insulating partitions and sheaths to prevent people from accidentally touching the live parts. At the same time, the cables will be properly insulated at the cable inlet and outlet to prevent leakage caused by damage to the cable sheath.
Furthermore, the setting of warning signs and protective devices cannot be ignored. Clear and eye-catching warning signs such as "high voltage danger" will be posted on the prominent position of the box type substation shell to remind non-professionals to stay away. At the box door, a locking device is usually installed, which can only be opened when specific conditions (such as power outage, power test, etc.) are met to prevent people from accidentally opening the box door and entering the dangerous area when the equipment is energized. In addition, for some frequently operated parts, such as the switch operating handle, a protective cover will be set to prevent people from accidentally touching the live parts during operation.
In addition, the box type substation is also equipped with a leakage protection device. When the line or equipment leaks, and the leakage current reaches the set value, the leakage protection device will act quickly to cut off the power supply to avoid further expansion of the electric shock accident. In addition, the box type substation is regularly tested for electrical safety, including insulation resistance testing and ground resistance measurement, to promptly detect and eliminate potential electric shock hazards and ensure that the equipment is always in a safe and reliable operating state.
Through the above series of comprehensive and rigorous safety measures, the box type substation effectively reduces the risk of electric shock, ensures the personal safety of operators, maintenance personnel and surrounding personnel, and enables it to play a stable and safe role in the field of power supply.
