Gas Insulation Capacitive Voltage Transformers with bushing
It is a capacitor voltage transformer which the insulation material is SF6 gas.
The bushing of the capacitor voltage transformer is made by silicon rubber or porcelain. There are some
aluminium electrodes inside the capacitor voltage transformer, to improve the electric field distribution inside
the capacitor voltage transformer.
There is a pressure relief device at the top of the capacitor voltage transformer, when the pressure is more
than 0.8MPa if the capacitor voltage transformer is discharge inside, the relief device will be broken to release
the pressure and send an alarm information.
There is a SF6 density monitor fix at the base, it can indicate the SF6 pressure which inside the capacitor
voltage transformer (its indicated value is the SF6 pressure at 20℃), and it will provide an information when
the SF6 pressure is drop down to the minimum service pressure of the capacitor voltage transformer, to
remind the user replenish the SF6 gas to the rated pressure.
The secondary terminals block is casted by epoxy resin, the frame of the secondary terminals box is a seal
structure, it suits for outdoor.
The nominal capacitance C2N of the capacitor voltage divider which type OM110/ 3 －0.01D for the capacitor
voltage transformer is 0.0211695μF and connected with the primary of electromagnetic unit from the bottom
of the divider.
Electromagnetic unit
The electromagnetic unit is assemblied by an intermediate transformer, compensating reactor, a damping
device and a surge arrester in a case, it is the base of the capacitor voltage divider.
There are two adjustable interstices in the core of the compensating reactor, and there are several adjustive
windings in the compensating reactor’s winding and the primary winding of the intermediate transformer,
theire terminals are connected with the secondary block, to adjust the accuracy freely. The interstices and the
connection of the adjustive windings are fixed before delivery, it shall not allow to change when the capacitor
voltage transformer service.
The low voltage terminal of the capacitor voltage divider is connected with earth firmly before delivery, it shall
not allow to loosen or even open the conncection when the capacitor voltage transformer service.
一、Service Conditions
a. Ambient air temperature: maximum 40℃, minimum -40℃, average value of the ambient air temperature does not exceed 30℃ measured during a period of 24h.
b. Altitude: The altitude does not exceed 1000m (this is the routine requirement, if there is any different requirement, we can provide the products with 2000m, 3000m, 4000m or 5000m altitude according to the clients’ requriments).
c. The average value of the relative humidity does not exceed 95% at 25℃ measured during a period of one month.
d. The maximum wind speed does not exceed 34m/s.
e. Eerthquake intensity does not exceed 8 degree.
f. There have to be no gas that may seriously affect the insulation and conductive ability of electric equipments, steam, ash, salt, chemical deposit, pollution and corrosive or explosive material.
二、Main Technical Parameters
Rated output and relative accuracy class (cosφ=0.8 lag) please see Table 2.
Notes: 1. The quantity of windings, rated output and accuracy listed can be designed according to the requirements of the clients;
2. Eeah thermal limit burden for protective winding is 2000 VA.
3.The system earthing mode is effectively earthed neutral system.
Dimensions of the voltage transformers
Search Results for :
