Dear new and old customers:

According to the national New Year holiday regulations and in combination with our company's actual situation, we hereby notify you of the specific arrangements for our New Year holiday as follows: from December 31, 2022 to January 2, 2023, there will be a 3-day holiday. We apologize for any inconvenience caused during the holiday period. Thank you for your understanding.

Dear new and old customers:

According to the regulations of national statutory holidays and combined with the actual situation of our company, we hereby notify you of the specific arrangements for our National Day holiday as follows: October 1st and October 7th, 2022. We apologize for any inconvenience caused during the holiday period.

On the arrival of the Mid-Autumn Festival, Hebei Taizhongyan Electrical Equipment Technology Co., Ltd. wishes all new and old customers a prosperous business, family reunion and a happy Mid Autumn Festival. Thank you very much for your long-term strong support to our company. The company's holiday schedule is as follows:

From September 10, 2022 to September 12, 2022, there will be a three-day holiday. We apologize for any inconvenience caused during the holiday period.

Recently, our company has discovered some incidents of spreading and selling our company name, product appearance, product instructions, etc. in the market, which seriously damages the interests of customers and the reputation of our company. In view of this, our company solemnly declares that all of our products have applied for appearance patents. Without our OEM or ODM authorization, no one has the right to use our company's appearance. Please pay attention to this detail when purchasing equipment and beware of being deceived. We reserve the legal right to investigate any suspected companies involved in counterfeit or stolen products from our company!

Please all customers, if they discover counterfeit or inferior products of our company, promptly report relevant information to our company to jointly maintain market order and the legitimate rights and interests of consumers. Thank you!

To ensure the legitimate rights and interests of our customers and friends, please call 0312-3156390 for consultation before making a purchase.

In the installation of power engineering, cable terminals and intermediate cable joints are important components of power equipment in transmission and transformation cable lines. Their function is to disperse the electric field at the external shielding and cutting point of the cable terminal, protect the cable from breakdown, as well as provide internal and external insulation and waterproofing. More than 60% of accidents in cable lines are caused by accessories, so the quality of joint accessories plays a very important role in the reliability of the entire power transmission and transformation.

1. The connection of conductors requires low resistance and sufficient mechanical strength, and there should be no sharp corners at the connection. The commonly used method for connecting conductors in medium and low voltage cables is crimping, which should pay attention to:

(1) Choose a conductor connecting tube with appropriate conductivity and mechanical strength;

(2) The clearance between the inner diameter of the pressure tube and the outer diameter of the connected wire core should be set at 0.8-1.4mm;

(3) The resistance value of the joint after crimping should not be greater than 1.2 times that of the conductor with equal cross-section, and the tensile strength of the copper conductor joint should not be less than 60N/mm2;

(4) Before crimping, apply conductive adhesive to the outer surface of the conductor and the inner surface of the connecting pipe, and use a wire brush to damage the oxide film;

(5) Sharp corners, burrs, etc. on connecting pipes, wire core conductors, etc. should be smoothed with a file or sandpaper.

2. If the cable body has an internal shielding layer, the internal shielding layer of the crimping tube conductor part should be restored when making the joint. A portion of the internal semiconductor shielding of the cable should be left to ensure that the internal shielding of the connection head on the connecting tube can be connected to each other, ensuring the continuity of the internal semiconductor and evenly distributing the field strength at the joint connection.

3. The treatment of external semiconductor shielding. External semiconductor shielding is a semiconducting material that provides a uniform electric field outside the insulation of cables and cable joints. Like internal semiconductor shielding, it plays a very important role in cables and joints. The outer semiconductor port should be neat and uniform, and it is also required to have a smooth transition with insulation. Semiconductor tape should be added to the cable joint to connect with the outer semiconductor shielding of the cable body.

4. The processing and construction of cable reaction force cones require accurate and precise shape and size of the reaction force cone. The potential distribution on the entire cone surface is equal. When making cross-linked cable reaction cones, cutting tools are generally used, or slightly heated with low heat and cut with a fast knife. After the basic shape is formed, it is scraped with 2mm thick glass and polished with sandpaper from coarse to fine until smooth.

5. Metal shielding and grounding treatment. The main function of metal shielding in cables and joints is to conduct cable fault short-circuit currents and shield electromagnetic interference from nearby communication equipment. In operation, the metal shielding is at zero potential in a well grounded state. When the cable fails, it has the ability to conduct short-circuit currents in a very short period of time. The grounding wire should be reliably welded, and the metal shielding and armor tape on both ends of the cable body should be firmly welded. The grounding of the terminal should be reliable.

6. The sealing and mechanical protection of joints are essential to ensure their reliable operation. Moisture and moisture should seep into the cable joints, and joint protection grooves or cement protection boxes should be built or installed at the joint positions.

In terms of technological level, China's power transmission and distribution equipment has reached a certain level in many aspects, but the degree of standardization still needs to be improved. With the development of smart grids, power automation systems are gradually becoming IT based. Traditional communication cables and control cables are being replaced by invisible signals on network cables, which poses huge challenges for power design, commissioning, acceptance, and operation personnel, and also puts forward higher requirements for equipment manufacturers.

At present, in order to meet the needs of the development of smart grids, devices such as circuit breakers and transformers must first achieve intelligence, that is, interact with the power grid system for interactive management, achieve visualization of device status, networked and automated control terminals, and ensure that the devices operate under reliable and economical conditions.

The smart grid will promote innovation in the power equipment industry system through technology, products, and industrial chains, enhancing the independent innovation, technological, and equipment manufacturing capabilities of the power equipment industry. In terms of technological innovation, it is necessary to achieve the localization of core technologies, the localization of key equipment, the industrialization of product preparation, and the systematization of the industrial system.

In terms of product innovation, power transmission and distribution equipment should improve its intelligent quality, achieve the integration of equipment intelligence, and reduce the clear boundary between primary and secondary equipment. Enhance the interactivity of devices, including the interaction between intelligent units and related devices, the interaction between primary and secondary devices, and the interaction between devices and customers. Through the integrated innovation of primary and secondary equipment, the overall solution capability and international competitiveness of equipment manufacturing enterprises will be greatly enhanced.

At the national level, starting from occupying the international technological high ground and mastering the discourse power of international power equipment manufacturing industry technical standards, preferential support policies for scientific and technological research and development should be introduced with power equipment manufacturing enterprises as the main body, so as to form an equipment technology system that combines production, learning, research, and application, form a batch of equipment products with completely independent intellectual property rights, and increase support for scientific and technological research and development.

Whether it is the start stop of the unit, the normal operation of the unit, or in case of accidents, electrical switching operation is an important part of daily work, ensuring the stable operation of the unit and the power grid. Due to the implementation of all-round duty officers for domestically produced 200MW units and the optimization of personnel combinations, the number of electrical duty officers has decreased, and there are not many experienced personnel. In terms of electrical engineering, the technical level and quality of personnel cannot keep up with the current situation, and there is a shortage of manpower in the electrical field. Although an all rounder on duty system is implemented, there are limitations in learning and significant gaps in the execution of switching operations. Especially for non electrical personnel, the operation of electrical switching is extremely non-standard, and most people have no knowledge of electrical switching operation. Therefore, discuss the electrical switching operation.