| Brand | Switchgear parts |
| Model NO. | Top busbar |
| Rated voltage | 12kV |
| Rated normal current | 630A |
| Series | 12-38kV |
The T-joint (cross joint) is suitable for brands such as ABB, Siemens, Schneider, etc. Thetop or botom of the ring main cabinet switch is fully insulated and sealed, and there aretwo types: shielded and unshielded. Matched with standard sockets for load switches,
also used in branch boxes with switches. Fully sealed and insulated connection hasbeen achieved for the load switch. Completely avoiding the fatal defects carried by GaoZhuang's naked ring in harsh weather. The ring network cabinet composed of T-joint
and cross joint busbar system has low cost and high reliability
The busbar system can be connected between the switch cabinets of the kV to 35kVGIS system, suitable for a minimum center distance of 280mm and a maximum currentof 1250A. The above busbar system adopts a bolted connection structure, and theflexible connection is not sensitive to the height error of the splicing cabinet body. Thecombination of busbar, cross joint, and T-joint can be installed on the socket of theswitch to achieve serial connection of multiple load switches. It is the preferred solutionfor combination type ring main unit. The length of the supporting busbar for the cross
joint T-joint can be customized according to customer requirements.
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Relay Protection Basics: Types of Transmission Line Faults and Fundamental Protection Schemes1. Types of Faults on Power LinesPhase-to-Phase Faults: Three-phase short circuit Two-phase short circuitGround Faults: Single-phase to ground fault Two-phase to ground fault Three-phase to ground fault2. Definition of Relay Protection DevicesWhen an abnormality or fault occurs in a component of a power system, relay protection devices are those that can quickly and selectively isolate the faulty or abnormal component from the system, ensuring the continued normal operation of the remaining healLeon09/05/2025 -
5 Common Transmission Line Faults and Effective Prevention Methods1. OverviewA transmission line fault is a sudden power interruption caused by various factors. To restore supply and prevent recurrence, operators must first locate the fault point, identify the type, determine the cause, and implement repairs.The most common faults include: Lightning strikes Ice buildup (icing) Wind deviation (wind sway) Bird-related issues Pollution flashover External damageUnderstanding these faults and their prevention is critical for grid reliability.2. Lightning Strike FauEdwiin09/05/2025 -
Strange Devices on Transmission Lines: 5 Little-Known Practical Functions（1）1 Aviation Warning SpheresAviation warning spheres, also known as reflective safety spheres, are used on overhead transmission lines near airports, especially on extra-high-voltage (above 220kV) lines and river-crossing transmission lines. Highly visible aviation marker spheres (aviation warning spheres) must be installed along the lines to provide warning signals.The aviation marker sphere (aviation warning sphere) has a diameter of ф=600mm. The sphere can be manufactured in various bright coloLeon09/04/2025 -
Transmission LineIn transmission lines, a "π" connection involves breaking the original line from Substation A to Substation B and inserting Substation C, forming a "π" configuration. After the "π" connection, the original single line is divided into two independent transmission lines. Following the "π" connection, Substations B and C may both be powered by Substation A (in this case, Substation C receives power via a feeder from Substation B's busbar, or possibly from another voltage point within Substation B);Encyclopedia09/04/2025 -
What are the principles of forced re-energization of transmission lines?Principles of Forced Re-energization of Transmission LinesRegulations for Forced Re-energization of Transmission Lines Correctly select the forced re-energization end of the line. If necessary, change the connection configuration before forced re-energization, taking into account the reduction of short-circuit capacity and its impact on grid stability. There must be a transformer with its neutral point directly grounded on the busbar at the forced re-energization end. Pay attention to the impactEdwiin09/04/2025 -
Analysis of Accident Handling in Transmission LinesAnalysis of Transmission Line Fault HandlingAs a fundamental component of the power grid, transmission lines are widely distributed and numerous, often exposed to diverse geographical and climatic conditions, making them highly susceptible to faults. Common causes include overvoltage, pollution flashover, insulation damage, tree encroachment, and external damage. Line tripping is one of the most frequent faults in power plant and substation operations, with fault types including single-phase-to-Leon09/04/2025
