DAHU electrical specializes in the production of 0.5-40.5kv transformers. It has cooperated with many national power bureaus for 10 years and exported to foreign markets. If there is any quality problem within the warranty period, it can be replaced free of charge.
Definition and function: Voltage transformer (PT) is mainly used to convert high voltage into low voltage (usually 100V) suitable for instrumentation or relay use, used to measure the line voltage, power and electrical energy, or to protect valuable equipment in the line in the event of line failure.
Structure: PT consists of primary winding, secondary winding, iron core terminal and insulation support.
Working Principle: The working principle of PT is similar to that of ordinary transformer with no-load condition, which realizes voltage transformation by changing the ratio of winding turns.
Technical parameters: in the 110kV and above voltage level system, PT usually has two secondary windings, rated phase main secondary winding voltage is 100/31/2V.
Step-down transformer
Definition and function: Step-down transformers are used to reduce high voltage to a voltage level suitable for the safe use of the consumer, e.g. to reduce a voltage of more than 100,000V to a three-phase, four-wire system of 380V.
Technical parameters: The technical parameters of step-down transformer include rated capacity, rated voltage, no-load loss, no-load current, short-circuit loss and so on. For example, the no-load loss of S9-M-800/6 step-down transformer is 1400W, load loss is 7500W, no-load current is 0.8% and impedance voltage is 4%.
PT and VT (voltage transformer)
PT (Voltage Transformer): Used to convert high voltage to low voltage for measurement and protection systems.
VT (Voltage Transformer): Similar in function to PT, also used for voltage conversion, but specific models and parameters may differ.
General
This type of voltage transformer adopts epoxy-resin vacuum casting and a fully closed single-phase structure for indoor use, is applicable for power systems of rated frequency 50Hz or 60Hz and rated voltage up to and including 10kV, used for electric energy metering and voltage measurement.
It complies with the standards GB 20840.1-2010 Instrument transformers-Part1:General requirements, GB 20840.3-2013 Instrument transformers-Part3:Additional requirements for inductive voltage transformers, and JJG314-2010 Instrument Voltage Transformers.
Use environment
- Altitude: should not exceed 1000m
- Ambient temperature:-5ºC~+40ºC
- Air relative humidity:≤85%
- Air relative site: indoor.
Technical parameter
- Insulation level:12/42/75kV, 7.2/30/60kV
- Power factor:cosφ=0.8
- Rated frequency:50Hz or 60Hz
- Weight: -23kg
Audited Supplier 
Definition and function: Voltage transformer (PT) is mainly used to convert high voltage into low voltage (usually 100V) suitable for instrumentation or relay use, used to measure the line voltage, power and electrical energy, or to protect valuable equipment in the line in the event of line failure.
){kind=link}