Substation optical isolator serial#

Standard DB9 connectors allows easy connection of any standard DB9 serial cable. The power supply is galvanic isolated from the rest of the isolator which ensures noise or surges from the power supply enters the isolator this gives an additional level of isolation.īaud rates of 300 to 115200bps and indication LED lights for TX, RX and Power makes this isolator easy to use and compatible with most serial devices. This isolator must be powered by an external 9 to 18 VDC power supply. High-speed 6N137 opto-couplers from Fairchild Semiconductor is what ensures protection and high performance in this isolator.

Static electricity and other high voltage surges is protected against for up to 15KV. Optical isolation for up to 2500 Vrms and continuous 500VDC ensures effective protection against voltage spikes and surges and ground loops. Limit switches are used to stop the motor when the isolator reaches its final position – open or closed.What we have here is a high-speed industrial grade RS232 optical isolator which provides isolation for all 8 communication wires. Motor is controlled by one closing coil and one opening coil, electrically interlocked. HV isolators may be single pole or three poles operated. Usually earthing contacts are only mechanical operated. Isolators may be mechanical or motor operated ( local or remote) and may provided with earthing contacts, mechanically interlocked with main contacts. Rated short-time withstand current ( 3 s).If an isolator is operated on load an arc blast and an explosion can occur and provoke damages to persons and equipments. Isolators are not able to be withstand and to extinguish electric arc and they can only be operated off-load. HV isolators are generally installed outdoors, in AIS substations ( Air Insulated Substation), seated in metallic structures, or indoors, in GIS substations ( Gas Insulated Substation). Similar to MV switch-disconnectors, MV isolators are installed in MV switchgears and in MV overhead lines. Isolators, also known as disconnectors, are used in HV and MV installations to isolate a circuit or parts of a circuit and to ensure, for safety reasons, to the operators and maintenance teams a visible interruption of the circuit. Also read: Maintenance of Power, Diagnostic & Monitoring in Substation.

In these situations fuses must be equipped with acting strikers to mechanically open the switch-disconnector, to avoid the functioning of installation with only two phases the switch-disconnector must have a tripping coil to allow the transformer protections to actuate. Switch-disconnectors may be mechanical ( lever or crank) or motor operated ( local or remote) and provided with earthing switches, mechanically interlocked, and release coils some utilities used them associated with fuses for the protection of MV/LV distribution power transformers (usually with rated power up to 630 kVA), as represented in Figure 2.įigure 2 – Switch-disconnector associated with fuses Rated short-time withstand current ( 3 s): 5 kA 16 kA 20 kA 25 kA.Rated voltage: 2 kV 12 kV 17.5 kV 24 kV 36 kV.Main characteristics of switch-disconnectors are: Also read: Design and Installation of EHV/EHV and EHV/HV Substations.

Substation optical isolator