Series YTJLW10-720 Voltage Transformers
Series YTJLW10-720 phase sequence, zero sequence voltage and current transformer is a kind of AC transformers with technical specifications that conform to the primary and secondary fusion equipment of the State Grid and in accordance with T/CES 018-2018 "Distribution Network 10kV and 20kV AC Transformers Technical Conditions".Voltage, current and power transformers are built into the product, which can be directly assembled with the circuit breaker to form an intelligent vacuum circuit breaker.easy to install, low power consumption, high accuracy and stable measurement.
■The main capacitor uses equivalent capacitance to collect voltage, which has good long-term stability and long-term operation experience in power grids.
■The output internal resistance is small, which can adapt to various cables, overcome the error caused by cables, and the cable interchange error is less than 0.1%.
■small accuracy change affected by ambient temperature, and the maximum error change is less than 0.5% in the full temperature range of -40 °C ~ 70 °C, which fully meets the need of the temperature variation index requirements of the 3-level transformer specified.
■adopts extremely stable power resistance and low-power core winding, good output stability and high precision, and meets the operating conditions of all working conditions
|Rated maximum voltage [kV]||25.8|
|Rated current [A]||630|
|Frequency [Hz]||50 / 60|
|Short time withstand current, 1sec [kA]||12.5|
|Short circuit making current [kA peak]||32.5|
|Basic impulse withstand voltage [kV crest]||150|
|Power frequency withstand voltage, dry [kV]||60|
|Power frequency withstand voltage, wet [kV]||50|
|Control and operation function||RTU built- in or separate digital control|
|Control||Operating voltage||110-220Vac / 24Vdc|
|Ambient temperature||-25 to 70 °C|
|Power frequency withstand voltage [kV]||2|
|Basic impulse withstand voltage [kV crest]||6|
|International standard||IEC 62271-103|
Dimensions in millimeters
Installation instructions and precautions
■Ensure reliable contact between the grounding wire and the housing during installation.
■The secondary output signal leads of the transformer should be closely wired against the box, and the excess leads must be cut short
■The secondary voltage output of the transformer to the ground is prohibited from working frequency withstand voltage
■Instructions for secondary wiring
|TYPE||Rated transformation ratio||Outlet identification||remark|
|Current phase sequence||600A/1V||Ia+Ia-，Ib+Ib-,Ic+Ic-|
|Current zero sequence||20A/0.2V||I0+ I0-||Identity I0+ I0- as Connect transition lines|
|Voltage phase sequence||10kV/√3/3.25V/√3||Ua+Ua- Ub+Ub- Uc+Uc-|
|Voltage zero sequence||10kV/√3/6.5V/3||U0+ U0-||Identity U0+ as Connect transition lines|
Since the zero-sequence current and zero-sequence voltage require three-phase synthesis, there is a need for intermediate transition line connection, each phase I0+, I0- correspond to plugging; The U0+ of each phase corresponds to the mating. Before leaving the factory, the product has been docked,Please mark it when installing. As following: