JSZW3-3, 6, 10 voltage transformers are indoor epoxy resin casting semi-closed structure, suitable for voltage, electric energy measurement and relay protection in AC 50HZ voltage 3, 6, 10KV neutral point non-effective grounding power system According to different installation methods, the product is divided into A type and B type. This type of voltage transformer is a semi-casting type, with small size and strong climate adaptability. The core of the transformer adopts a core-type structure with a side iron yoke, and is made of high-quality cold-rolled silicon steel sheets stacked in a rectangle. The primary, secondary and residual voltage windings are concentrically wound together, cast and molded with epoxy resin, and the three-phase casting body is fixed together. The primary winding is fully insulated at the A end, and the other N end is not fully insulated. The wiring diagram is shown in Figure 1: According to the installation method, this product is divided into A type and B type. Type A products are installed on the side, and the mounting holes are on the iron core clip. Type B products have a mounting base, which is used to strengthen the product. Conditions of Use: 1. The altitude does not exceed 3000 meters; 2. The ambient temperature is not higher than ten 40'C, not lower than one 5'C; 3. The relative humidity of the air in the weekly warehouse is not more than 85% (20 C); 4. There is no corrosive gas in the installation site1. Before the voltage transformer is put into operation, the test and inspection shall be carried out according to the items specified in the regulations. For example, measuring polarity, connection group, shaking insulation, nuclear phase sequence, etc. 2. The wiring of the voltage transformer should ensure its correctness. The primary winding should be connected in parallel with the circuit under test, and the secondary winding should be connected in parallel with the voltage coil of the connected measuring instrument, relay protection device or automatic device. At the same time, attention should be paid to the correctness of the polarity. . 3. The capacity of the load connected to the secondary side of the voltage transformer should be appropriate, and the load connected to the secondary side of the voltage transformer should not exceed its rated capacity, otherwise, the error of the transformer will increase, and it is difficult to achieve the correctness of the measurement. 4. No short circuit is allowed on the secondary side of the voltage transformer. Since the internal impedance of the voltage transformer is very small, if the secondary circuit is short-circuited, a large current will appear, which will damage the secondary equipment and even endanger personal safety. The voltage transformer can be equipped with a fuse on the secondary side to protect itself from being damaged by a short circuit on the secondary side. If possible, fuses should also be installed on the primary side to protect the high-voltage power grid from endangering the safety of the primary system due to the failure of the transformer's high-voltage windings or lead wires. 5. In order to ensure the safety of people when touching measuring instruments and relays, the secondary winding of the voltage transformer must be grounded at one point. Because after grounding, when the insulation between the primary and secondary windings is damaged, it can prevent the high voltage of the instrument and the relay from endangering personal safety. 6. Short circuit is not allowed on the secondary side of the voltage transformer.