Voltage Regulators & Stabilisation

AVRs and Power Conditioning

In the general context of Power Quality issues, power outages are among the most annoying events.
The CEI EN 50160 Standard defines the supply interruption as “a condition in which the voltage at the supply terminals is lower than 5% of the reference voltage”.
A power outage can be categorized as:
• Scheduled, when users have previously been notified;
• Accidental, if it is caused by transient or permanent failures, mainly related to external events, such as equipment failures or third party interference. An accidental interruption is classified as long (> 3min), short (<3min) or transient (<1sec)
Scheduled interruptions are typically due to the execution of programmed maintenance works on the power grid. The effects of a scheduled outage can be minimized by the users by taking timely measures.
Accidental interruptions, on the other hand, are unpredictable and largely random events, generally caused by the intervention of operating or protective devices.
Under normal operating conditions, the annual number of outages can vary from a few dozen to several hundred, depending on the characteristics of the network. According to the statistics, 70% of outages last less than a second. long outages usually originate from unrealizable supply or external causes or events that cannot be predicted by the supplier.
The effects of interruptions, even temporary, mainly affect the most sensitive users:
• computers, PLCs, processors;
• control systems;
• drives;
• lighting with gas discharge lamps;
• electronic devices;
• protection and control relays.
Power outages typically cause the equipment to stop, in particular the categories listed above, but they also cause some damage. In particular, the aspect that we want to take into consideration in this article is the voltage recovery transient that takes place immediately after the interruption.
Among the many different network events that can lead to a power outage, we can identify three macro- categories:
• Loadshedding events
• Tripping of a network overload protection
• Tripping of a short circuit or earth fault protection
In addition, after an interruption the voltage transient may have an initial overshoot. In general, the stress on the most sensitive equipment can cause damage (for example to electronic boards), which in the case of sophisticated industrial users have a great impact in terms of costs for production stops (identification of the fault, replacement of the component, provided that it is available and not to be ordered from the distributor or the manufacturer). This leads to loss of production and downtime costs.

Automatic Voltage Regulators (AVR)

The automatic voltage regulator (AVR) is a device intended to regulate voltage automatically. This equipment is designed to take a varying voltage level and turn it into a constant voltage level on the output.

Drensky provides both electronic and servo type AVRs. We offer installation and after-sales service of AVRs from basic 500VA single phase AVRs through to the more sophisticated three phase models up to 1MVA. These AVRs are designed for use in areas where voltage fluctuation is common, and damage to sensitive electronics occurs.

The brands that we supply are :

  • Drensky
  • AEC
  • Delta
  • Ortea
  • IREM

Power Conditioning

Power conditioners improve the quality of power being delivered to an electrical device by ensuring that voltage which is at the correct level and has the correct characteristics is being used to enable load equipment to function properly. Power conditioners also protect equipment against power surges, by shutting off the main power source, and electromagnetic (EMI) and radio-frequency (RFI) interference.

Our single or three phase POWER CONDITIONER – HIGH CURRENT units combine both surge/transient suppression and EMI/RFI filtration to protect against interference and come standard with circuit breakers. The unit is supplied in a wall-mountable housing with a hinged, lockable door. These modular units are fully serviceable and are available with either 40kA or 100kA suppression modules on the primary side. These units are ideal for the protection of high cost equipment, for example CAT scanners, MRI scanners, computer rooms and process controls.

Other Power Regulation Offerings

Other supplementary services that Drensky offers include :

  • Energy Metering
  • Power Analysis and Recording
  • Power Factor Correction
  • Harmonic Filtering

Please contact us should you wish to enquire about any of these services.

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