Automatic correction setting system (SANK 4.2 SAU4)

System purpose is the determination of capacity currents in 6-35 kV networks and setting of biasing-controlled arc-suppression coils (ASCs) (РУОМ type).

There exist certain issues in the course of ASC operation in 6-35 kV networks:

  • The network configuration is changing constantly. Those changes must be monitored and corresponding adjustment of ASC setting must be made. It has been an impossible to implement until now, since the network analysis and ASC setting adjustment are the tasks requiring highly-qualified personnel. In case of incorrect setting, there occurs electric arc with the line-to-ground short circuit (LGSC) and cable destruction which all leads to the consumer disconnection for the whole period of tracing the damaged area and repairing
  • Controlled arc-suppression coils (CASCs) of common types cannot be operated in automatic mode in case of integrated sections, while the network configuration is changing. This means inaccurate setting.
  • As a rule, controlled ASCs are more expensive than uncontrolled; besides, many networks contain older types of ASCs that are still in service. However, those do not meet modern needs of power grids for the accurate compensation of capacity currents in case of LGSC. Replacement of those older ASCs with CASCs is a measure requiring high expenditures
  • In case of LGSC, it is desirable to monitor the indications of instruments for subsequent analysis and elimination of the insulation damage causes. It is an impossible task if LGSC occurs at an unattended substation

All these issues can be resolved through the use of SANK-5.1 system in combination with plunger-type CASC. In such a case:

  • Complete automation of capacity currents correction can be implemented. Each 5-10 minutes, SANK analyses network parameters, determines the current in case of LGSC and sets CASC to the current, so no personnel interference is required
  • When a correction of LGSC capacity currents is required on adjacent sections of a network with probable integration of the latter, SANK use makes it possible to analyze both separate and integrated networks and set the correction with the accuracy independent from the current circuit configuration. When sections are integrated, CASC load in case of LGSC becomes proportional to their power
  • In case of significant capacity currents, it is possible to use SANK for setting CASC+ASC system (where ASC is and uncontrolled reactor) for the purposes of economy (it is possible to use less powerful CASC); in this case, ASC corrects the main part of the current while CASC allows SANK system to adjust the correction setting in case of the network configuration change. At that, there is an opportunity of integrating sections keeping the automated operation mode active
  • CANK stores information about all short circuits that occurred: date, duration, CASC current and neutral-to-ground voltage, which makes it possible to analyze the network condition. This information can be accessed both directly from CANK display and remotely - through Ethernet-based LAN

Brief technical overview:

  • Patented innovative method of capacity currents measuring ensuring error not exceeding 2%
  • Setting of any biasing-controlled arc-suppression coils
  • Parallel operation of several systems in combined sections
  • Operation in the presence of uncontrolled ASCs in the section
  • Line-to-ground short circuit statistics collection
  • Data transmission using Ethernet-protocol
  • Dimensions (HxWxD): 170x230x110 mm, weight 2.5 kg
  • Russian Federation utility patent No 88221

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