The gropunding transformer with earthing resistors cabinet (NGRs)
1.About us:
Baoding Tianwei Hengtong Electric Company is a domestic professional manufacture of power system neutral grounding equipments and complete implements ISO9001 quality management system. We have a excellent sales performance all over the world and have been exported to more than 40 countries. TWHT offers a complete range of products for the necessary neutral-point connections
2. General introduction:
THT-DKS (C) series grounding transformer, as three-phase transformer, is used to provide an artificial and support loads neutral point for the system with no neutral point and the system grounding. Grounding modes: direct grounding, combination grounding with arc suppression coil or resistor or grounding reactor and etc., grounding transformer can be used as a substation power with a secondary winding for continuous use. Grounding transformers produced in our company have the majority of users in recent years with low loss, low noise and reliable performance. Technical parameter: Rated capacity: 23~6500kVA; Rated voltage: 10~66kV/0.24kV.
III. Product models and technical parameters
1. Model description 2. Dimensions of THT-DKS- (6~10KV) oil-immersed grounding transformer
3.1 Good electrical properties and low values of partial discharge: Dry-type transformer can make the values of the partial discharge lower due to its unique structure (all the high and low voltage winding are wound with copper belt (foil)) and advanced manufacturing technology level (all the high and low voltage winding are poured with epoxy resin in vacuo and cured).
3.2 Strong ability of resistant to lightning impulse: Due to all the high and low voltage windings are wound with copper belt (foil) causing the voltage between layers to be lower and the capacity larger as well as the starting voltage distribution of the foil windings is nearly linear, the anti-lighting impulse ability is strong.
3.3 Strong ability of short circuit withstand: Due to the reactance in the high and low voltage windings is the same with no helix angle leading to the ampere turns between coils to be balanced and the axial force of the high and low voltage windings caused by the short- circuit is almost zero, its ability to withstand short circuit is strong.
3.4 Good performance of anti-cracking: Dry-type transformer adopts epoxy resin "thin and insulation (1-3mm) technology " to satisfy the low and high temperature and occasions with large temperature range, to meet the anti-cracking requirements after long-time running and to resolve the cracking problem which is hard for "thick and insulation (6mm) technology" , so that the dry-type transformer is ensured the reliable protection in technology.
3.5 Overload capability: If the load losses of the transformer with the same capacity are equal, the area of the copper conductor is correspondingly increasing than that of the copper foil, after the volume increased, the amount of filer resin is also increasing, so the hot winding capacity is larger, and the transformer short time overload is stronger.
3.6 Excellent flame retardant property: Adoption of epoxy resin vacuum pouring process has no environmental pollution and is environmentally friendly, such transformers with maintenance-free, moisture proof, damp heat resistance, flame retardant and self-extinction properties apply for a variety of environments and conditions.
3.7 Low loss, low noise: Iron core commonly introduces high-quality cold rolled silicon steel sheet with mineral oxide insulation through advanced processing technology to make the loss level and no-load current to a minimum and achieve very low noise level. Also, the surface of the assembled core shall be coated with Class F resin paint to prevent the dust, corrosion, smoke and rust.
3.8 High temperature resistant: Epoxy resin dry-type transformers are Class F or Class H insulation and can be long-time safe operation under high temperature of 155°Cor 180°C. In the same capacity condition, you can save installation costs for its small size and lightweight.
3.9 Relevant technical specifications: 1.Capacity≤10000kVA; 2.Voltage≤35kV; 3.Insulation class F or H.
3.1 Dimension of THT-DKSC- (6~10kV) dry-type grounding transformer
3. technical parameter
4. technical parameter