Introduction and classification of Rittal switchgears

1. What is TT, IN, IT system? A: The TT method refers to a protection system that directly grounds the metal shell of electrical equipment, which is called a protective grounding system, also known as a TT system. The TN method is a protection system that connects the metal shell of the electrical equipment with the working neutral line, called ...

1. Extremely high; 2. The appearance is RAL7035 color (gray and white), which is consistent with the cabinet; 3. Ultra-thin design, the installation method can be plug-in and embedded; 4. The power supply range, single-phase and three-phase power supply models can be selected; 5. Control ...

What are the precautions for using current transformers? Answer: 1. The secondary side shall not be open when working; 2. One end of the secondary side must be grounded; 3. The polarity of the terminal should be paid attention to when connecting. What are the precautions for using voltage transformers? A:1. When working, its secondary side shall not be short-circuited ...

The quality and brand awareness of Rittal are good, and the application market is also large, but due to various reasons such as price, delivery time, service, etc., many customer groups do not want to use Rittal products, but choose to go to the manufacturer to order imitation Rittal products. ...

Power system: The wire and cable products used in the power system mainly include overhead bare wires, busbars (busbars), power cables (plastic cables, oil-paper power cables (basically replaced by plastic power cables), rubber cables, overhead insulated cables), branch cables, magnet wires and power equipment...

Which electrical equipment must be grounded or zeroed? Answer: (1) The base and shell of generators, transformers, motors, high and low voltage electrical appliances and lighting appliances; (2) the secondary coil of the transformer; (3) the framework of the switchboard and the control panel; (4) Transmission device of electric equipment ...

What to do if you notice someone electrocuted? Answer: First of all, make the electrocuted person quickly disconnect from the power supply. Its method, for low-voltage electric shock, can be used "pull", "cut", "pick", "pull", "pad" method, pull or cut off the power supply, the operation should pay attention to avoid people rescue people electric shock, should ...

1. SYV: solid polyethylene insulated RF coaxial cable, coaxial cable, radio frequency signal transmission in wireless communication, broadcasting, monitoring system engineering and related electronic equipment (including comprehensive coaxial cable) 2. SYWV(Y): Physical Foamed Polyethylene Insulated Cable TV System Cable, Video ...

Power system The wire and cable products used in the power system mainly include overhead bare wires, busbars (busbars), power cables (plastic cables, oil-paper power cables, which are basically replaced by plastic power cables), rubber sheathed cables, overhead insulated cables, branch cables (replacing part of the busbars), ...

1. The circuit breaker cannot be closed Causes: 1. The undervoltage coil does not work (the voltage is normal). Solution: Replace the undervoltage coil. 2. Press the closing button, and the closing coil will not work when it is powered up. Solution: Replace the undervoltage coil. 3. Cooperation...

How is an electric current formed? Answer: The free electrons in the conductor move regularly and directionally under the action of the electric field force, and an electric current is formed. What are the indicators of power quality? Answer: Voltage deviation, voltage fluctuation and flicker, voltage sine wave distortion rate, frequency deviation. ...

31. How many modes are there for the three-phase neutral point operation of China's power system? Answer: 1. Three-phase system with no grounding (insulation) at the neutral point; 2. Three-phase system in which the neutral point is grounded through the arc suppression coil; 3. Three-phase system with direct grounding at the neutral point. 32. Use current transformers ...

What are the relay protections of small and medium-sized substations? A: A overcurrent protection; B. Current quick-break protection; C. Time-limited current quick break protection; D Low voltage protection. What is the classification of substation monitoring system? A: Manual monitoring, automatic monitoring of telecontrol devices and micro-...

1. It can meet the needs of many electrical appliances, and relatively speaking, in the process of making industrial control cables, the relevant standards of various information in the process of dissemination are fully considered. In this way, it can ensure that the industrial control cable can meet the performance of many electrical appliances in daily work.

What are the conditions that must be met for high-voltage appliances? A: A. The insulation is safe and reliable; B. Long-term operation under rated current and certain short-term overload capacity; C. Able to carry the thermal and electrodynamic effects of short-circuit currents without damage; D. Switching electrical appliances can be safe...

"In 2022, with all the challenges, especially for small and medium-sized manufacturing companies – we need to think differently: if we want to support our customers and add value in our digital transformation, it's not just a single product innovation that will change. It will combine automation, digital ...

At the China International Information and Communication Exhibition (PT Exhibition) in Beijing, Rittal is showcasing its innovative "edge data center" solutions. In an era of increasing demand for high-speed processing and maximum flexibility, small, flexible edge data centers are digitizing enterprises in a steady stream of ...

1. Disconnect the power supply, check whether the rack of the control cabinet has reliable grounding, and make the grounding resistance not greater than 4Ω. 2. There are voltages of different properties on the control cabinet (DC 110V; Communication single-phase 220V; Three-phase communication), the circuit must be distinguished during maintenance to avoid short-circuit accidents.

In recent years, with the accelerated development of China's informatization process and the continuous expansion of its scale, the demand for digital centers, as the carrier of the digital economy, is also increasing day by day. The operation of the digital center needs the support of a stable and energy-saving power system.

Complete set of electrical maintenance knowledge: 1. Low-voltage distribution cabinet 1. Regularly check whether there are traces of pest activity in each cabinet, and carry out trapping regularly. 2. Check whether the warning signs and maintenance signs are placed correctly. 3. Check whether the emergency tools and lamps are in order.