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Surge Protection Devices - SPDs

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SURGE PROTECTION DEVICES

Transient Surges are caused mainly by lightning & switching actions. The secondary effect of lightning causes transient over voltages which damages sensitive electrical and electronic equipment installed Indoor/ Outdoor. Commonly used protective devices like HRC Fuses, MCBs, ELCBs etc. are current sensing devices and they sense /operate in a few milliseconds. Since the surge is a Transient over voltage which occurs for few microseconds, these devices cannot sense them.

Hence, Indian and International Standards recommend installation of Surge Protection Devices. SPDs are to be installed in addition to the UPS to protect the sensitive electrical and electronic equipment. SPD is required even to protect UPS. In fact, the new IS/IEC-62305 series and NBC- 2016 standards have made it mandatory that, wherever external lightning protection is provided, it is necessary to install Surge Protection Devices.

The function of a surge protection device is to sense and limit the transient over voltages to levels which the connected equipment can withstand safely.

SPDs need to be provided for POWER, SIGNAL, INSTRUMENTATION, ETHERNET and TELECOM lines.

The selection & installation of SPD is a Specialist job as the installer shall have thorough knowledge on the current Indian & international standards along with hands-on experience because there are challenges related to each site. Again it is specialised because, most of the panel builders & technicians who install SPDs are conversant with MCB installations & follow the same practice, without reading the “installation manual” of the SPD manufacturer. If the above practices are followed, customers will have years of trouble free operation of their equipment & SPDs.

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SPD for Power Lines

SPDs for Power lines are available for AC (Three phase and Single phase) & DC applications. International Standards recommend SPDs based on Lightning Protection Zone.

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SPD for Instrumentation

Field mounted transmitters are more prone to failures due to surges as they are installed in open atmosphere. The TSP series protectors are designed to protect field mounted transmitters. All the models are intrinsically safe.

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SPD for Load Cell

Transient over voltages, that appear between line to line, line to screen and line to earth can easily damage analog load cells and strain gauge sensors.

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SPD for Telecom application

EPBAX connected to telephone lines (10 pair-Krone MDS) must be protected as they are sensitive due to very low surge withstand capacity.

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SPD for Data Network

The increased use of computers as a management tool and the information stored on these equipment makes the Ethernet, a critical part of an installation.

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SPD for RF (replaceable GDT)

The RF signal receiver or transmitter generally located at High elevations are normally prone to atmospheric surges and needs protection.

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SPD for PLC Communication

TPP series surge protectors are suitable to protect all kinds of communication, automation/control lines. These are used in fire & security systems.

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SPD for CCTV Camera & DVR

CLP range of co-axial SPDs protects LAN, security & traffic cameras, video recorders and broadcast equipment in the field.

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SPD for LED Lighting system

LSP series SPDs are designed to protect LED lighting systems like LED Signage, street lighting, traffic light, roadway lighting and parking lot lighting.

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Equipotential protector

The EPP series equipotential protector provides an equipotential bond under transient overvoltage conditions between different earthing systems.

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