YDQ Gas-Type Test Transformer
Gas-Type Test Transformer
With the development of China's power industry, the voltage level requirements for test transformers are increasingly higher, while traditional oil-immersed test transformers are increasingly unable to meet the requirements of field work in terms of volume and weight. Gas-type test transformers reduce volume and weight, making it more convenient for customers to carry to the field for testing
With the progress of basic scientific research in China and the application of new materials and new processes, the new medium sulfur hexafluoride gas has been introduced into the application field of power equipment. Due to the excellent insulation performance, arc extinguishing performance, and non-flammability of sulfur hexafluoride gas, it has been widely used as a new insulating medium.
Structure
1. The design concept, material selection, and process flow of the YDQ series products are all new. Therefore, they are not only small in size, light in weight, and beautiful in appearance, but also all technical indicators meet the requirements of the <<JB3570－98>> standard.
YDQ series products use high-quality cold-rolled DQ-151 oriented silicon steel sheets stacked into a multi-stage cylindrical frame-shaped iron core, and use QZ type wires to directly and continuously wind high-voltage tower-type coils on a specially made high-strength insulating cylinder. The shell is of suitable size and filled with SF6 gas.
2. The difference between YDQ (JZ) products and YDQ products is that the high-voltage rectifier silicon stack is cleverly installed inside the high-voltage bushing, and by inserting or extracting the short-circuit rod, it can be switched between YDQ's power frequency high-voltage AC output and high-voltage DC output.
3. The difference between YDQ (C) products and YDQ products lies in the internal structure of the bushing.
III. Main Features
> The product is small in size and light in weight (40%-65% lighter than oil-immersed test transformers of the same level).
> Clean, no oil stains, no maintenance required.
> Not affected by harsh weather conditions, and can be tested immediately after on-site handling without needing to rest.
> The insulation strength is significantly higher than that of oil-immersed test transformers, with extremely low corona.
IV. Technical Parameters
> Voltage level: 10——600KV
> Capacity range: 1——600KVA
> No-load current: <7%
> Impedance voltage: <8%
> Partial discharge at rated voltage: <5PC
GTB Dry-Type Test Transformer
Overview
This series of products has the characteristics of light weight, small size, beautiful appearance, stable performance, and convenient use and portability. It is especially suitable for on-site operation and use, and is a new type of AC/DC dual-purpose high-voltage test transformer for domestic upgrading. This series of products is suitable for insulation performance testing of various electrical equipment in power systems and various power users, as well as high-voltage power supplies in various voltage systems or devices with DC high voltage and small current for electrical products.
Dry-Type Test Transformer
Structure
This series of transformers uses advanced production equipment, adopts new processes of coil winding epoxy vacuum casting and CD-type iron core. Compared with similar oil-immersed transformers, it significantly reduces weight and volume, improves insulation strength and moisture resistance in quality, and effectively weakens magnetic flux leakage and greatly strengthens it.
Technical Indicators
> Impedance voltage: 12%
> Output voltage waveform: power frequency, sine wave
> Surface temperature rise: 〈55℃
> No-load loss: 0.2%~0.35%
> Allowable continuous overrun time: 1/hour
> Intermittent operation time: continuous
YD (C) Cascade High-Voltage Test Transformer
Overview
The main features and functions of the YD (C) cascade high-voltage test transformer are the same as the YDJ/TDM series. Its difference from the above transformers is that it has great advantages compared with high-voltage test transformers, because the entire test device is composed of several single test transformers. Each single test transformer has small capacity, low voltage, light weight, and is easy to transport and install. It can be connected in series to combine outputs several times higher than a single test transformer, or it can be separated into several sets of single test transformers for independent use.
Characteristics
In the basic principle diagram of the cascade test transformer, the low-voltage power supply is applied to the primary winding a1x1 of test transformer I, and the output voltages of single test transformers I, II, and III are all V. The excitation windings A1, C1 supply power to the primary winding of the second-stage test transformer II; the excitation windings A2, C2 of the second-stage test transformer II supply power to the primary winding of the third-stage test transformer III. The boxes of the second-stage test transformer II and the third-stage test transformer III are at high potentials of 1V and 2V to ground respectively, so the boxes are insulated from ground, and the box of test transformer I is grounded.
