Rittal toroidal transformers Primary connection 115 V/400 V

Why use transformers to measure high voltage and high currents? Answer: (1) Expand the scope of use of the instrument. As long as the transformer with different transformer ratios and converter ratios is used in conjunction with a voltmeter with a full voltage of 100V and an ammeter with a full current of 5A, it will be ...

1. The power cords of the two cabinets are connected to the power socket at the rear of the cabinet. 2. The RS232 interface of the two cabinets is connected together with a communication cable. 3. Lock the door of the main cabinet, and turn on the power from the cabinet and the main cabinet in turn. ...

11. What is the definition and classification of secondary circuits? Answer: The secondary circuit is used to monitor the measuring instrument, control the operation signal, all the low-voltage circuits of the relay and automatic devices are called the secondary circuit, and the secondary circuit can be divided into (1) current circuit according to the power supply and use; (2) Electricity ...

21. What does the workplace have to meet for high-voltage electrical appliances? Answer: A. Rated voltage, B. Maximum working voltage, C. Rated current, D. Rated short-circuit interrupting current, E. Short-time withstand current and peak withstand current. 22. What are the basic requirements for a high-voltage circuit breaker? Answer: A work ...

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1. Improve the environment inside and outside the cabinet 1. We not only need to keep the electrical cabinet dry and clean, but also need to do a good job of cleaning and sanitation in the distribution room where the distribution cabinet is placed to prevent water and dust from entering the cabinet 2. The lighting environment of the distribution cabinet should be good, and it should be equipped with professional cabinet lighting ...

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. Rittal cabinet can be divided into three series from the structure, ES cabinet (five-fold profile cabinet), PS cabinet (nine-fold profile cabinet), TS cabinet (sixteen-fold profile cabinet), the biggest feature is that the Rittal cabinet is the selection of profile structure structure, the structure of the cabinet is welded first, and then the top plate, bottom plate, side panel, door...

1. About the electrical part: 1. The input side and output side of the miniature circuit breaker are inverted. 2. The voltage of the coil of the electrical parts does not match the voltage of the drawing, especially the voltage of the small relay and indicator light is easy to error. 3. The positive and negative polarity of electrical appliances is reversed, and the internal polarity of DC electrical appliances is reversed.

1. The Rittal air conditioner does not start when it is turned on, and the A17 is faulty. Check that the power supply voltage is 220V, normal; Detect that the battery voltage of the remote control is 3V, which is normal; Measure the fuse resistance value of the air conditioner compressor with a multimeter as infinity, which is normal. 2. The Rittal air conditioner does not start when it is turned on, and the display is not started.

1. The network cabinet distribution frame is fixed in place, the panel paper is loaded into the distribution frame on the front, and the tray is installed on the back. 2. Positioning of the cable management board, the direction of the cable management board should be determined before threading when positioning the cable management board, so that the cable management board does not need to twist the direction in the process of line management, and it can enter the ...

The "Eastern Data and Western Computing" project aims to promote the rational layout of data centers, optimize supply and demand, green intensification and interconnection, so that the computing resources in the west can more fully support the computing of data in the east and better empower the country's digital development. 　　IT infrastructure is an important ...

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. Site selection. The location of the low-voltage distribution room should be close to the load center, set up in a place with less dust, less corrosive medium, dry and slight vibration, and should appropriately leave room for development; Second, the layout of power distribution equipment. The layout of the distribution equipment in the low-voltage distribution room must follow the principle of safety, safety, and safety.

1. DC resistance: 20°C, 0.4mm copper wire, less than or equal to 148Ω/km, 0.5mm copper wire, less than or equal to 95Ω/km. 2. Insulation electrical strength: 1min 1kv between conductors does not break down, conductors and shields 1min 3kv do not break down 3. Insulation resistance: each core and the rest of the core ...

The model of the power cable 1. Use the capitalization of the first letter of Hanyu Pinyin to indicate the type of insulation, conductor material, inner sheath material and structural characteristics. For example, Z is used to represent paper (zhi); L stands for Aluminum (LV); Q is for lead (qian); F stands for fen; ZR stands for Flame Retardant (zura...

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.

What are the common decompression starting methods of cage asynchronous motors? Answer: (1) Three-phase resistance decompression start. (2) The reactor starts under reduced pressure. (3) Autotransformer decompression start. (4) Star delta decompression start. (5) Extension ...

First, set posts and responsibilities. The power department of distribution box equipment should number, register, file, hierarchical management, clear responsibilities, and regularly carry out technical inspection and maintenance of the distribution box.

Energy consumption planning continues to grow, and countries around the world have significantly increased the supply of low-carbon power such as nuclear, hydro, wind, and solar energy in order to achieve energy conservation and emission reduction. But now that natural resources are simply being exploited, what are the important developments of green energy that are lacking? The answer is: geothermal energy ...