MV Earthing switches for indor applications up to 36kV
Earthing switches are designed to satisfy the most requirements for earhing cable outgoings in MV cubicles up to 36kV. Nominal switch current are from 630A to 2500A.
Blades are manufactured from high conductivity copper coated with silver. For fast swithching earthing switch have toggle mechanism for manual closing and opening.
Construction
The insulator carries contact. Blade contacts are made of special copper profile, which ensures great mechanical and thermal strength during high currents. Contact pressure in parallel moving contacts is obtained by means of compression springs. Currents in parallel moving contact blades are mutually attracting each other with great force which results in high contact pressure in case high shot currents.
Technical details
| Nominal voltage [Un] | 13,8kV | 33kV |
| Lightning impulse withstand voltage (1,2/50µs) | 95kV | 170kV |
| Power frequency withstand voltage (50Hz, 1min) | 38kV | 70kV |
| Nominal current | 630/2500A | 1250A |
| Short-time withstand current (3sec) | 25kA | 25kA |
| Short circuit making current | 63kA | 63kA |
Tests
...according to IEC 62271/200
KONCAR designs earthling switch according to your specific requirements, too. Please ask for detailed dimension drawings, or tell us your requirements and specifications. We will be pleased to propose a custom solution, or to jointly develop one with you.
Types and measures
There are two types earthing switches. One is for 13,8kV (630A and 2500A) and second for 33kV (1250A). Dimensions are on the pictures below.
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U sljedećoj tablici prikazane su osnovne karakteristike pojedinog zemljospojnika:
| Tipska oznaka zemljospojnika | Nazivni napon | Nazivna struja |
| ZGB 17-25-210 | 13,8kV | 630A |
| ZGB 17-25-275 | 13,8kV | 2500A |
| RGB 38-25-SA | 33kV | 1250A |
Schematics
There are two typical schematics earthing switches. One is for 13,8kV and second for 33kV.
Notice: We reserve the rights of changing the data, due to continuous development of specifications and materials. Characteristics and dimensions can be regarded as binding only on our confirmation.
