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Область применения

The 4FL voltage regulators for transformers are used as ballasts for systems with fluctuating voltages. A constant voltage is available for the consumer at the output of the voltage regulator which ensures constant machine power independent of the fluctuating system.

Дизайн

The task of the voltage regulator for the transformer is to supply the electrical consumers with constant voltage in the event of system fluctuations.

The advantage of a voltage regulator with a variable transformer is the proportional change of the sine wave i.e. the special characteristic of the voltage regulator is that the rms, average, and peak values are kept proportionally constant.

For example, consumers whose load is determined by the thermal limit values require a good rms value. High-capacitance loads for DC devices respond to the average value. Low-capacitance loads, on the other hand, are influenced by the peak value. However, the described factors can only be achieved for sinusoidal AC voltages which can only be implemented with a variable transformer.

They stabilize the connected input voltage U₁ irrespective of frequency and power factor to the rated factor of the output voltage U_2N within the set control accuracy (± 1 % of U_2N). The control time is 1.5 s to 2.5 s from the top or bottom limit. The wave shape of the input voltage is not changed.

The output voltage U₂ is compared in the electronic step controller with a set reference voltage. In the event of a deviation in voltage greater than the set response value, the electronic step controller compensates the deviation with an accuracy of ± 1 % using a servo motor and adjustable moving contact on the variable-ratio transformer.

Transformer voltage regulators:

• are galvanically connected to the supply system
• can be overloaded for a short time (see characteristic)
• can be installed in a sheet-steel housing to IP21 complete with any additional components
• have an efficiency of between 95 % and 98 %
• are not maintenance-free
• Range of control and deviation see "Selection and ordering data"
• For symmetrical mains voltage: The voltage deviation is only monitored on one conductor and set for all three conductors.
• For asymmetrical mains voltage: The voltage deviation is monitored on each conductor and set individually for each conductor.
• The neutral conductor 1N must be connected. If no neutral conductor is present on the mains side, a neutral earthing transformer is required (on request).

Ambient conditions

4FL transformer voltage regulators are climate-proof for mounting in rooms with an internal climate to DIN 50010.

Limit values:

• Ambient temperature for
  • Rated power + 40 °C,
  • Lowest permitted temperature – 25 °C.
• Relative air humidity
  • At 40 °C up to 85 %,
  • Annual average up to 65 %,
  • Condensation not permitted.

Short-circuit and overload protection

Transformer voltage regulators must be protected with gL/gG fuses on the primary side against damage caused by short-circuits. The fuse rated current must be determined according to the highest primary current (present with the lowest input voltage). Overload and short-circuit protective devices according to the rated load current must be provided on the output side. An overload relay is integrated in the control circuit, the trip contacts (break or make) must be connected on a switch that automatically disconnects the transformer voltage regulator from the mains in the event of a fault.

Характеристика

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