Functional requirements
This is an example how to describe your requirements for 11 kV switchgear which is SCADA controlled. Switchgear consist of 11kV busbar, fixed type circuit breakers, disconnectors and associated control and protection equipment.
The 11 kV indoor switchgear shall provide for the following:
- Connection of 11 kV feeders, bus tie cables, system transformer and distribution transformer circuits to the 11 kV busbar
- Isolation and earthing of feeders, bus tie cables, system transformer and distribution transformer circuits
- Protection and SCADA control for 11 kV feeders, system transformer and distribution transformer circuits and sections on the 11 kV busbar
- Connection, protection and SCADA control of 11 kV harmonic filter or capacitor banks
- Means to perform a dc test on the HV cables, without disturbing existing HV cable
connections
Table 1 – Details of general requirements of a switchboard for 11 kV indoor switchgear.
| Parameter | Designation |
| Switchboard type | Metal enclosed |
| Class | Indoor |
| Method of neutral earthing of the system | Effectively earthed and non-effectively earthed |
| Main device type | Non-withdrawable (stationary) |
| Busbar insulation medium | Cast resin or air |
| IP rating | IP3X |
| Possible extension to switchboard | Both sides |
Table 2 – Switchboard common ratings
| Parameter | Rating |
| Number of phases | 3 |
| Rated system voltage (Ur) | 12 kV (minimum) |
| Rated frequency (fr) | 50 Hz |
| Busbar Rated normal current | Single |
| 630 A or 1250 A | |
| Rated lightning impulse withstand voltage (Up) | |
| Common value | 95 kV (peak) |
| Across the isolating distance | 110 kV (peak) |
| Rated short-duration power-frequency withstand voltage (Ud) | |
| Common value | 28 kV (rms) |
| Across the isolating distance | 32 kV (rms) |
| Rated short time withstand current (Ik) (for main and earthing circuits) | 16 kA (rms) |
| Rated peak withstand current (Ip) (for main and earthing circuits) | 40 kA (peak) |
| Rated duration of short circuit (tk) (for main and earthing circuits) | 1 sec. |
| Internal arc classification (IAC) | AFLR |
| Arc test current | 16 kA |
| Arc test current duration | 1 sec. |
Low voltage cabinet for secondary equipment
The secondary equipment including protective relays, controls, transducers, metering and other systems shall be housed in a low voltage cabinet located on the relevant circuit breaker panel.
The location of the panel shall be suitable to enable the installation of all secondary wiring and accessibility for terminating wiring, programming of protection relays and general testing and commissioning activities.
Where it is appropriate, equipment may be mounted on a torsion resistant panel door.
The cabinet shall be fitted with a removable gland plate, cable ducting and terminals. The layout within the cabinet shall ensure for the following:
- Adequate room is provided for the termination of multi-core control cables, dc auxiliary supply cables and other miscellaneous cables that are required for interfacing with equipment within the substation.
- Cable terminals shall be readily accessible to enable connection of test equipment associated with protection relay testing and commissioning.
- Cable ducting within the cabinet shall be located to allow for the installation of multi-core control cables.In particular, adequate room between duct and cable entry points to allow for the bending radius of cables.
- Internal cabinet colour shall be white.
| Title: | Technical Specification Of 11 kV SCADA Controlled Indoor Switchgear (With Interlocking Diagrams) – NSW Government |
| Format: | |
| Size: | 1.3 MB |
| Pages: | 59 |
| Download: | Right here | Video Courses | Membership | Download Updates |
ACB 1600A
we have inquiry for the following items,
11KV SWITCHGEAR IN SUSBSTATION
B04
Please provide to me the following information :
Short Circuit Glade for 11 KV
Short Circuit Glade for 415 V .
this is for our new plant in Russail . Thanks