Interlocking system for switchgear automation in double busbar substation

Edwiin
05/09/2025

  1. The tripping of all circuit breakers (CBs) by protective relays is unrestricted.
  2. The opening command for all circuit breakers, except for the busbar coupler circuit breaker, is unrestricted.
  3. An opening command cannot be issued for the busbar coupler circuit breaker under the following circumstances:
    1. Both busbar disconnect switches (DSs) of any feeder are closed.
    2. Any busbar disconnect switch or sectionalizing disconnect switch is in the transition state.
  4. A closing command cannot be given for a circuit breaker when its associated line disconnect switch or busbar disconnect switch is in the transition state.
  5. A line disconnect switch can only be operated when its associated circuit breaker and feeder earthing switch (ES) are open.
  6. A feeder earthing switch can only be operated when its associated line disconnect switch (if applicable) and busbar disconnect switch are open.
  7. A busbar disconnect switch can be operated when its circuit breaker, busbar earthing switch, feeder earthing switch, and the other busbar disconnect switch are all open (except for item 8).
  8. If a busbar disconnect switch is closed, the second busbar disconnect switch can only be operated when the relevant busbar sections are connected through the busbar coupler circuit breaker.
  9. A busbar earthing switch can only be operated when the busbar disconnect switches and the busbar sectionalizing disconnect switch on the associated busbar are open.
  10. A busbar sectionalizing disconnect switch can only be operated when all the busbar disconnect switches and the busbar earthing switch on the same side of this sectionalizing disconnect switch are open.
Edwiin

Hello,I'm Wdwiin. A decade of hands-on experience in electrical engineering, specializing in high-voltage systems, smart grids, and renewable energy technologies. Passionate about technical exchange and knowledge sharing, committed to interpreting industry trends with professional insights to empower peers. Connection creates value—let’s explore the boundless possibilities of the electrical world together!

What is Steady State Stability in Power System?
What is Steady State Stability in Power System?
Definition of Steady State StabilitySteady state stability is defined as the capability of an electric power system to sustain its initial operating condition following a small disturbance, or to converge to a state closely approximating the initial condition when the disturbance persists. This concept holds critical significance in power system planning and design, the development of specialized automatic control devices, the commissioning of new system components, and the adjustment of operati
Edwiin
07/26/2025
What is Voltage Stability in Power Systems?
What is Voltage Stability in Power Systems?
Definition of Voltage StabilityVoltage stability in a power system is defined as the ability to maintain acceptable voltages at all buses under both normal operating conditions and after being subjected to a disturbance. In normal operation, the system’s voltages remain stable; however, when a fault or disturbance occurs, voltage instability may arise, leading to a progressive and uncontrollable voltage decline. Voltage stability is sometimes referred to as "load stability."Voltage instability c
Encyclopedia
07/26/2025
Difference Between Shunt and Series Voltage Regulator
Difference Between Shunt and Series Voltage Regulator
Linear voltage regulators are mainly classified into two types: shunt voltage regulators and series voltage regulators. The key difference between them lies in the connection of the control element: in a shunt voltage regulator, the control element is connected in parallel with the load; in contrast, in a series voltage regulator, the control element is connected in series with the load. These two types of voltage regulator circuits operate on different principles and thus have their own advanta
Edwiin
07/25/2025
What is Dual Trace Oscilloscope?
What is Dual Trace Oscilloscope?
What is Dual Trace Oscilloscope?DefinitionA dual-trace oscilloscope uses a single electron beam to generate two separate traces, each deflected by an independent input source. To produce these two traces, it primarily employs two operating modes—alternate mode and chopped mode—controlled by a switch.Purpose of a Dual-Trace OscilloscopeWhen analyzing or studying multiple electronic circuits, comparing their voltage characteristics is often critical. While one could use multiple oscilloscopes for
Encyclopedia
07/25/2025
Inquiry
Download
IEE-Business is dedicated to serving the personnel in the global power industry.
Join IEE-Business, not only can you discover power equipment and power knowledge, but also canhnd like - minded friends!