LONGITUDINAL GRAPHITIZATION FURNACES, PRJSC UKRGRAFIT

01.09.2017

Portable rectifier VP-TPZH 180k / 30-105-UHL3 for sequential DC current supply of eight longitudinal graphitization furnaces was delivered and commissioned to PRJSC UKRGRAFIT workshop. As a part of the project implementation our company fulfilled works for design development and manufacturing.

Basic rectifier parameters:

     Name             Indication
 Rated rectified current, kA

180

 Rated rectified voltage, V

30-150

 Power supply voltage, kV

10

 Current control system accuracy, %

0,25

 Transformer ТCNPUD-63000/10-UHL3
 Standard transformer power, MVA

63000

 No of on-load tap changing steps

14

 Rectification circuit

12-pulse

 HF power of 11th and 13th harmonics, kVAr

2х4200

 Product weight, t

145

The product is emplaced on 3 trucks. The transformer is located on a self-propelled truck, and two more clip-on trucks with converter section containers are disposed on each side of it. The self-propelled truck travel is ensured by controllable motor-drives. Containers are made with IP54 protection level.

The product is emplaced on 3 trucks. The transformer is located on a self-propelled truck, and two more clip-on trucks with converter section containers are disposed on each side of it. The self-propelled truck travel is ensured by controllable motor-drives. Containers are made with IP54 protection level.
The product uses a liquid cooling for the transformer, converters and the DC bus system. Service recycled water is applied in the external contour, and deionized water with glycol is applied in the internal contour of the converter cooling. Oil cooling is used for the transformer, and distilled water with glycol is used for cooling the DC bus system.
The voltage (current) control is a smooth-stepped type, with a combination of both on-load tap changing steps for the transformer and smooth control within a step.
The cooling systems are redundant.
As a tool of communication with a portable rectifier 10kV network a pantograph type disconnecting switch is used.
Converter containers are made of non-magnetic material.
The rectifier control system represents a two-level structure for automatic process control system (APCS). The first level is the converter control systems, the second one is a regulation of current division between converters, control and regulation of high-voltage equipment, including pantographs, on-load tap-changer control, cooling systems and truck travel regulation.
As a part of delivery together with portable rectifier harmonic filters (HF) were supplied to compensate the reactive power and voltage harmonic distortion. The HFs are designed for compensation of the 11th and 13th harmonics generated by a 12-pulse rectification circuit.
The switching of HFs is made automatically during rectifier operation when consumption of reactive power from the network is increasing.
The unit is equipped with a remote control system, in particular the remote control cabinet (RCC) and the remote control panel (RCP).
The RCC contains a programmable logic controller that controls high-voltage cells, regulates 11th and 13th HFs, monitors parameters of the 10 kV network, and exchanges data with other devices in the workshop.
The parameters in RCC are transmitted according to Profibus protocol.
Remote control of self-propelled truck of the rectifier unit, HFs and high-voltage switchgear cubicles through RCC can be performed both by using buttons located on the RCC door, or by using mobile graphic panel on converters containers.
The remote control panel comprises an automated operator workstation with a preinstalled SCADA system.
The remote control system allows to create, edit and delete graphitization techniques. These remote control systems are transmitted and received over the fiber optic channel.