First of all, let's get familiar with the common lighting accessories. It has: lamp holder, switch, socket, hanging box and lampshade.
Lamp holder: Its function is to fix the bulb (or tube). According to its structure, it can be divided into screw mouth and bayonet (socket) lamp holder; according to its installation method, it can be divided into hanging lamp holder (commonly known as lamp holder), flat lamp holder and tubular lamp holder; Bakelite, porcelain and metal lamp holders; according to their use, they can be divided into ordinary lamp holders, waterproof lamp holders, safety lamp holders and multi-purpose lamp holders.
Switch: A device that functions to turn the power on or off. It is generally called a light switch. According to the installation form, it is divided into clear and concealed. The surface-mounted type has a pull switch and a dial switch (also called a flat switch), and the concealed type uses a dial switch (also called a springboard switch). According to its structure, it is divided into single-pole switch, bipolar switch, three-pole switch, single-control switch, dual-control switch, multi-control switch and rotary switch.
Socket: Its function is to provide power for mobile lighting appliances, household appliances or other electrical equipment. It is easy to connect, flexible and versatile. It has the functions of surface mounting and concealing. According to its structure, it can be divided into single-phase bipolar double-hole, single-phase three-level three-hole (one with extremely protective grounding or zero) and three-phase four-pole four-hole. (There is a pole connected to zero or grounded) sockets, etc.
Hanging box: Or hanging box is used to hang chandeliers or connecting lines, generally plastic and porcelain.
Lampshade: Its function is to control the light, improve the lighting efficiency, and make the light more concentrated. The lampshade has many forms. According to its material, it can be divided into glass cover, enamel cover, thin aluminum cover, etc.; according to the effect of reflection and transmission diffusion It can be divided into direct indirect and semi-indirect. In the production and living lighting, the commonly used lampshade has several types such as a cone, a tower shape, an explosion-proof shape, and an oblique shape.
Basic lighting circuit
The circuit is the path of current, and the function of the lighting circuit is to convert electrical energy into light energy. It includes power supplies, lights, wires and switches, etc. The basic lines of electrical lighting are as follows:
1. A single switch controls a lamp as shown in Figure (A) below. When wiring, the switch should be connected to the phase line (commonly known as the fire line), so that after the switch is cut off, there is no electricity on the lamp head for safety.
2. Two double-switches control one lamp in two places, as shown in the following figure (B). This type of control is usually used for electric lights on stairs, which can be controlled both upstairs and downstairs, sometimes also Corridor lights can be controlled at both ends of the corridor.
3. Two double switches and one triple switch control one lamp in three places, as shown in the following figure (A). This method is generally used for stairs and corridors.
The local lighting power supply below 4.36 volts is generally powered by a fixed step-down transformer. The wiring is as shown in Figure (B) below. When installing, the primary side of the transformer should be equipped with a fuse and a double-pole switch, which not only can protect the transformer, but also protect the secondary side from short-circuit, and the secondary side should also have a protective casing and low voltage. The side should be grounded or zeroed for safety. Multi-ground control switch
Lighting circuit construction drawing
The basic circuit of electrical lighting described above is not sufficient for construction. This is because the specifications, model, installation requirements, wiring layout and other features of the electrical components are not indicated on the drawings. As the basis for the actual circuit installation, it must be based on the national construction of the relevant electrical technical standards and unified symbols drawn construction drawings. There are two common types of lighting construction drawings:
Workshop lighting circuit diagram
Schematic diagram of the lighting system, which shows the connection between the various components of the electrical system, the working principle of the electrical system and its role (not related to the structure and installation of the electrical components).
As shown in Figure (A) above. The other is the installation wiring diagram, which is the main drawing of the installation engineering, and is drawn according to the actual structure and installation of the electrical components. The installation wiring diagram only considers the installation wiring of the component and does not clearly indicate the operating principle of the electrical system. It is often combined with the floor plan drawing. As shown in Figure (B) above, it is the "language" of engineering technology. It is necessary to recognize and determine what electrical components are drawn on the map, how they should be connected and what technical requirements are there, so as to prepare the materials and perform the correct installation.
We adopt the advanced technology imported from Europe, patented technology, specialized software to optimize the design for33kV cast resin Dry Type Transformer. The core is made of cold-rolled grain-oriented silicon steel sheet which cut in step-lap by GEORG Germany TBA core cutting lines and laminated by the method of fifth-order step-by-step stacking technology, enabling the no-load performance of the core to improve greatly. The epoxy resin from American HUNTSMAN is adopted for the windings which casted in the vacuum resin casting machine imported from HEDRICH, Germany. The winding material ensures good permeability, no bubbles occur, which leads to minimum partial discharge. The HV and LV winding mate with each other tightly, which ensures solid strength of structure and capability to withstand short circuit and vibration. Under normal service condition, the service life of dry type transformer is 30 years. No crack will form on the surface of transformer winding due to temperature variation as long as the transformer runs under normal service condition.
Earthing Transformer,33Kv Dry Type Transformer,33Kv Transformer,33Kv Cast-Resin Transformer
Hangzhou Qiantang River Electric Group Co., Ltd.(QRE) , https://www.qretransformer.com