Capacitor voltage transformers(CVT)

1． Application

Capacitor voltage transformers(CVT) are intended for voltage measurement, power measurement, auto controls, relay protection in effectively earthed neutral system or non- effectively earthed  neutral system and intended to be a coupling capacitor in carrier coupling device in power line.

2.  Applicable standards

GB/T4703      《电容式电压互感器》

IEC60044-5     《电容式电压互感器》

JJG314         《测量用电压互感器》

3. Construction and feature

CVTs consist of a capacitor divider and an electromagnetic unit, Capacitor divider comprise one or several coupling capacitors in series. Capacitor divider and electromagnetic unit are connected between intermediate terminal and low-voltage terminal. An electromagnetic unit contains an intermediate transformer, a compensating reactor, a protective device and a damper which are assembled in an oil filled tank. Secondary winding is lead out through terminal box in tank front.

4. Main feature

(1)"C"iron core is more stable and reliable.

(2)Rapid-saturated reactor can effectively suppress ferro-resonance and keep open-delta residual voltage below 1V

(3)In 0.02s following short circuit, residual short circuit, which meets the requirements 11 of quick relay protection device.

(4)The quality is reliable for good dielectric and insulation material. advanced design and vacuum impregnation, and excellent partial discharge.

5.Instructions for ordering

When ordering CVT

①  Specify product name and typo

②  Specify system earth manner

③  Specify product primary and secondary rated voltage or voltage ratio

④  Specify accuracy class and rated load of each secondary winding

  ③ Specify creepage distance of outer insulation

⑥ it is a common product if not specify