TYD110/√3-0.02-H

Capacitor voltage transformer

Outdoor capacitor voltage transformer for voltage and power measurement, automation and relay protection in 50 Hz HV and EHV networks; also serves as a coupling capacitor for power-line carrier communication. A fast-saturating reactor damper effectively suppresses ferroresonance.

Key parameters

Rated voltage: 110/√3 kV
Rated capacitance: 0.02 µF
Rated frequency: 50 Hz
Specific creepage distance (H version): ≥ 25 mm/kV

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Technical features

The capacitor voltage transformer (hereinafter, the transformer) uses advanced fast-saturating reactor damping technology, a C-type magnetic core and a rational choice of parameters. This makes it possible to suppress sustained ferroresonance quickly and effectively, and the transformer has high transient performance. The transient residual voltage is reduced to less than 5 %, meeting the requirements of high-speed relay protection; the residual voltage of the three-phase open delta is kept below IV — operation is more stable and reliable.

Solid and liquid dielectrics with high electrical insulating properties are used, combined with a rational choice of parameters and advanced technology of individual vacuum drying and individual oil filling of each element. The capacitors have good partial discharge characteristics, low losses and reliable quality. The product is fully hermetically sealed and requires no maintenance under normal operation.

Purpose and application

Transformers of this series are used in 50 Hz high-voltage and extra-high-voltage power networks for voltage and power measurement, automatic control and relay protection, and also serve as coupling capacitors in power line carrier (PLC) communication equipment.

The transformer is for outdoor installation. Conditions at the installation and operation site:

Ambient air temperature: −40 … +45 °C.
Altitude: not more than 2000 m (products for altitudes above 2000 m are manufactured separately to customer requirements by mutual agreement).
Wind speed: not more than 150 km/h.
Seismic intensity: not more than 8 degrees.
No severe pollution, vibration or shocks.

Type designation

TYD110/√3-0.02-H

T	unit (set)
YD	capacitor voltage transformer
110/√3	rated voltage of the transformer, kV
0.02	rated capacitance of the transformer, µF
H	environmental and service conditions: H — for polluted areas; TH — for humid tropical climate; G — for high altitude (plateau); F — for networks with non-effectively earthed neutral

Main technical parameters

The transformer can operate continuously at 0.8–1.2 times rated voltage. Transformers for networks with effectively earthed neutral can operate at 1.5 times rated voltage for 30 s; for networks with non-effectively earthed neutral without automatic earth-fault tripping — at 1.9 times rated voltage for 8 h.
Winding connection group of the intermediate voltage transformer: 1/1/1/1-12-12-12 or 1/1/1-12-12.
Products with the letter "H" in the designation have a specific creepage distance ≥ 25 mm/kV; for special creepage distance requirements, see the note to the routine test report of the capacitor voltage transformer.
Insulation level of the transformer — see Table 1; overall dimensions — Table 2.
Accuracy classes of the transformer and the corresponding voltage errors, phase displacement and operating conditions — see Table 3.
Deviation of the capacitance of the coupling capacitor C, the high-voltage capacitor Ci and the intermediate-voltage capacitor Ca of the capacitive divider from rated values: not more than −5 % … +10 %, and the relative difference between the deviations of Ci and C2: not more than ± 5 %.
Dielectric loss tangent of the capacitive divider: not more than 0.0015.
The transformer complies with IEC 358 and IEC 186.
The rated voltage, rated capacitance, accuracy class and secondary burden of the transformer should be selected according to the application conditions.

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