Voltage control relays

Voltage control relay

Voltage control relays control the magnitude of alternating voltage in low voltage electrical networks. They are installed at the entrance to the dashboard together with other protective devices. Depending on the magnitude of the operating voltage and the type of low-voltage (1p / 3p) protected electrical network, single-phase / three-phase voltage control relays are used.

Learn more

In a typical situation, when single-phase consumers are fed from a three-phase input, it is recommended to use a "universal" three-phase voltage control relay (e.control. v04m), which is designed for continuous value control in three-phase and single-phase circuits as well as to protect consumers of electricity from increased or decreased voltage. RMS voltage measurement method. Its technical characteristics are as follows:

Nominal voltage when connecting L1, L2, L3, V - 380, 400, 415
Nominal voltage when connecting L1, L2, L3, N, V - 220, 230, 240
Frequency Hz 50
Upper limit trigger setting, % 105-130
Lower limit trigger setting, % 70-95
Maximum operating current, A 8
Contact - 1NO+1NC
Number of modules - 1

Types of voltage control relays

To control the value of the supply voltage / protection of three-phase consumers, we choose a three-wire connection scheme (L1, L2, L3), and the switch for selecting the value of the supply voltage must be in the 3P3W position; for the protection of single-phase consumers connected to a three-phase input, a four-wire connection scheme (L1, L2, L3, N) is used; the switch must be in the 3P4W position. Switching from three-wire to four-wire mode must be done with voltage removed.

Реле за контрол на напрежение1 | Енекст България — Voltage control relay three-phase adjustable e.control.v04m

The method of connecting a voltage control relay depends on the value of the rated current that the contact group of the voltage control relay can withstand for an unlimited time.

If the rated current of the contact group of the voltage control relay is equal to or greater than the value of the current consumed by the load, and the load itself does not create large starting currents when it is turned on and does not work in heavy modes, then the relay o for voltage control is connected in series, and if they are less - then the voltage control relay is connected in parallel. When connected in parallel, the voltage control relay is used to control a contactor that can handle the rated current drawn by the load. In this case, only the self-consumption current will flow through the voltage control relay, and the power consumed by the contactor coil will be much less than the power consumed by the load. Therefore, even a voltage control relay with a small value of the rated current of the contact group can perform this functional task.

There is a misconception that it is enough to install a voltage control relay and this will provide complete protection against emergency situations. The voltage control relay does not protect against overvoltages, for these purposes it is necessary to additionally use overvoltage protection devices and overvoltage limiters. Only the complete combination of all protection and control devices will provide the required level of protection.

It is worth adding that in standard models of voltage control relays there is no built-in protection against short-circuit and overload currents, therefore, according to the circuit diagram, a protective switch must be installed in front of the voltage control relay. Information on the principle of connection of the voltage control relay is available in the passport of the device.

Реле за контрол на напрежение2 | Енекст България — **Three Phase Voltage Control Relay Digital e.control.v06**

Security devices installed separately from other security devices will not provide the full range of protection. The circuit breaker cannot control the voltage and the voltage control relay is not designed to protect against short circuit/overload overcurrent and atmospheric shock. Therefore, it makes sense to put a full set of protection devices and voltage control relays at the design stage of low-voltage electrical networks of objects. Overall protection will be the best solution in this situation and will contribute to the correct operation of the voltage control relay.

In addition to single-function voltage control relays, the assortment includes multi-function voltage control relays, which perform other functional tasks in addition to continuous monitoring of the network voltage. One such voltage relay is Voltage Control Relay Digital e.control.v06. This voltage control relay is designed to continuously control:
— the values of three-phase alternating current voltage and protection of electricity consumers from increased or decreased voltage;
— correct phase alternation;
— symmetry of the mains voltage;
— complete phase of the mains voltage;

Types of voltage control relays

Structurally, voltage control relays are divided into unregulated voltage control relays and regulated voltage control relays. In non-adjustable voltage control relays, the upper and lower trip voltage limit values are set at the factory and cannot be changed by the user. One such voltage control relay is our voltage control relay, three-phase e.control.v03m, which is designed to continuously control the value in three-phase and single-phase circuits as well as to protect electricity consumers from overvoltage or undervoltage. . RMS voltage measurement method. In adjustable voltage control relays, the user can change the response voltage value according to the upper and lower limits thanks to the buttons on the housing of the voltage control relay, as well as the time interval for switching on after restoring the mains voltage parameters to the preset ones ranges. One such voltage control relay is the voltage control relay single phase e.control.v02

Реле за контрол на напрежение3 | Енекст България — **Voltage and current control relay 25A e.control.v10**

The principle of operation of the voltage control relay

If the mains voltage deviates up or down from the set limit values, the load is disconnected from the mains.

After restoring/normalizing the mains voltage parameters, the position of the contact group of the voltage control relay changes automatically with a preset or set time-delay. When the voltage control relay is operated in conjunction with a contactor, the load will switch on automatically if the voltage control relay is connected in combination with an independent input breaker release; the reboot was done in manual mode.

Реле за контрол на напрежение4 | Енекст България — **Voltage control relay, single phase e.control.v00, 63A**

Why buy voltage control relay from us

Our product range includes a wide and constantly updated range of voltage control relays, covering the entire range of requirements of design and installation organizations and the needs of domestic users.

Реле за контрол на напрежение5 | Енекст България — **Automatic load transfer relay e.control.v12**

You can buy single-phase (three-phase) voltage control relays from our physical stores, or choose from our official online store, and you will get fast delivery to your chosen address or office of a courier company.

Voltage control relay
Types of voltage control relays
Types of voltage control relays
The principle of operation of the voltage control relay
Why buy voltage control relay from us