As a result of the public, the impact of lightning current is huge, and in the event of an accident, the loss is unpredictable. In particular, the damage caused by lightning to the power system will be irreparable. The most common hazards of lightning on the power system are direct lightning strikes and inductive lightning. Direct lightning strikes are lightning strikes directly onto objects; induced lightning is a rapidly changing lightning electric field, which occurs due to electrostatic induction or electromagnetic induction on nearby unclosed conductors. Voltage, a large current on the closed conductor causes a lightning accident. What countermeasures do we need to face in the face of lightning damage to the power system?
The first is to plan early and prevent in advance. It is necessary to strengthen the professional management and technical supervision of lightning protection and overvoltage in various power grids, transmission and distribution, and special transformers in the power supply area, and increase the overhaul and technical reform of lightning protection facilities for transmission and distribution equipment, and take Measures such as standardized management of transmission and distribution lines can effectively prevent the damage caused by overvoltage to power grid equipment.
Second, we must thoroughly check the line. Combined with the characteristics of local climate, comprehensively inspect the lightning protection facilities of transmission lines, focusing on strengthening the grounding device inspection and grounding resistance measurement and lightning protection grounding excavation inspection, and timely handling the grounding device and grounding resistance that do not meet the requirements of the regulations. If the distance is not up to the requirements, it must be rectified in time. Do a good job in measuring the grounding resistance of the power distribution area. It is necessary to formulate a solution for the unqualified grounding area and replace it in time.
Finally, we must do a good job in the installation of low voltage lightning arresters. The low-voltage lightning arrester must be installed at the head end of each outlet of the power distribution station area (below RT insurance) to ensure that all power distribution equipment in the power distribution cabinet can be protected. For the distribution area where the grounding resistance is qualified or is not qualified, the installation plan of the low-voltage arrester should be established as soon as possible and the installation should be organized.
In addition, it is necessary to strengthen the grounding resistance of distribution transformers and the detection of lightning protection devices. The damaged lightning arresters, porcelain insulators and various hidden dangers are all eliminated before the arrival of the thunderstorm season, effectively improving the lightning protection capability of the power grid.
Nowadays, the power system has been applied to various fields of society, covering a wide range. Once the lightning strike is damaged, the damage is huge and the loss is heavy. Strengthening lightning protection for power systems and power supply facilities is a necessary means of protecting power systems. Therefore, before the arrival of lightning, the lightning protection work should be done carefully, and the corresponding lightning protection device should be installed for safety protection to ensure the safety of the power system.
Downhole motor is composed of five assemblies: by-pass valve, motor, anti-drop, cardan shaft and drive shaft.
Downhole motor is a kind of downhole dynamic drilling tool upon the power of drilling mud. Mud stream from the
outlet of mud pup flows through a by-pass valve into the motor. This stream produces pressure loss at both inlet and
outlet of the pump to push the rotor into ratating, and to transmit the torque and speed onto the bit. The downhole
motor property mainly depends upon its property parameters.
Drilling Motors
Drilling Motors,Drill Motor,Mud Motor Drilling,Downhole Drilling Motor
Weifang Shengde Petroleum Machinery Manufacturing Co., Ltd. , http://www.sdpetromachine.com