Monthly Archives: maio 2018

Databases

A current transformer has a core and a winding. And both the material and the dimensions of a toroidal core, such as the size of the winding wires or cables, are standardized, and the designer must follow the specifications of the recommended standards.

There are few manufacturers in the market that are producing noble iron materials and correct cores for the construction of high accuracy transformers. This work takes into account two international manufacturers: Magnetics (USA) and Vacuumschmelze (Germany), since no domestic manufacturer of noble materials was found.

The program is flexible because it allows adding the database of other materials. The first item in the Core menu has the submenus: Material, Dimensions and Windings, where you can specify the material type and dimensions of the core, and the type of wire or cable used for the windings.

The first step is to enter the data of a material and clicking the button New will appear an auxiliary panel.          ORC4SACHP37P61

In order to calculate the errors of a CT it is necessary to specify two characteristics of the material: the magnetization curves (Bm x Hm) and the losses of the iron (PF x Bm).

 

Explosive Gas Disposal Set

The purpose of the explosive gas disposal kit is to inject a large amount of nitrogen into the equipment, continuously, creating a safe environment inside the transformer and the switch, eliminating explosive gases from inside and ensuring cooling of the oil and components the equipment.

The explosive gas disposal set may have several outlets and provide different nitrogen streams for each section of the protected equipment.

Parts that make up the set:

  1. Output to the transformer tank;
  2. Output to the on-load tap-changer;
  3. Output to the tank if separation of oil and gases;
  4. LED for the service indication.

With the transformer tank rupture, a flow of oil from the conservator to the transformer takes place. Without the conservative shutter valve, any conservator oil will possibly be spilled, fed and spraying fire.

The conservative shutter valve is designed to close when an atypical flow of oil occurs, preventing the drainage of the conservator’s tank.                    2BK70H

The control panel is installed in the control room of the substation and is connected to transformer protections, fire detectors, isolation valve, shutter valve of the conservator, rupture disk and nitrogen cylinder cabinet.