The digital voltage regulator is used to adjust the AC power supply in areas where the mains is unstable and easy to fall, to prevent electrical damage caused by overvoltage or Undervoltage. The digital voltage regulator can ensure the stable output of the current, and ensure that the voltage flowing to the electrical equipment remains unchanged at 220V (+5%) and 220V (+9% in the ER model).
The relay is an automatic control device where the input quantity (electricity, magnetism, sound, light, heat) reaches a certain value, and the output quantity will change in a jumping manner. It is a stepped voltage regulator. The product can be in 180V, 200V, 220V, 240V There is a step-by-step switching between the voltages. The product has a fast response speed and low production cost, but there is an instantaneous power failure when switching the voltage.
The voltage stabilizer is composed of a voltage regulating circuit, control circuit, and servo motor. When the input voltage or load changes, the control circuit performs sampling, comparison, and amplification, and then drives the servo motor to rotate to change the position of the carbon brush of the voltage regulator. The coil turns ratio is automatically adjusted to maintain the stability of the output voltage. Voltage stabilizers are widely used in unstable regions/countries, which can help factories and homes solve the problem of unstable electricity, thereby preventing your equipment or household appliances from being damaged due to unstable electric waves. Help you save maintenance costs.
Current fluctuation is the cause of the efficiency drop and damage of various electrical equipment. The voltage regulator can prevent current fluctuations from rising and falling when reaching electrical equipment. Once the input voltage rises or falls to the input voltage range, VVS will disconnect the output to protect the device from the load. Once the main voltage returns to the acceptable voltage range, the VVS will reconnect the output to further pass the current. Therefore, the microprocessor-controlled circuit unit with powerful functions is called VVS.
Suitable for power transformers with load tap changers (LTC) and single-phase regulators; can be independently adjusted according to the voltage deviation range; compensate the line by adjusting resistance and reactance or by a simplified voltage drop percentage method (compensation Z) Voltage drop; six independent voltage regulation parameters that can be activated by hour programming (internal clock) or external dry contacts.
When multiple generators are connected in parallel, the AVR system will have circuits that ensure that all generators operate at the same power factor. [1] The AVR on the grid-connected power station may have other control functions to help stabilize the grid and prevent sudden load loss or failure caused by the fault.
When the input (such as voltage, current, temperature, etc.) reaches the specified value, the electrical appliance that makes the controlled output circuit turn on or off. It can be divided into two categories of electrical quantity (such as current, voltage, frequency, power, etc.) relays and non-electricity (such as temperature, pressure, speed, etc.) relays. It has the advantages of fast action, stable operation, long service life, and small size. Widely used in power protection, automation, sports, remote control, measurement, and communication devices.
The relay has a control system (input loop) and a controlled system (output loop). It is usually used in automatic control circuits. (relay-type automatic voltage regulators) It is a kind of "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.
Technical parameters of the main products of relays
Rated working voltage refers to the voltage required by the coil when the relay is working normally. Depending on the type of relay, it can be either AC voltage or DC voltage. Current resistance refers to the DC resistance of the coil in the relay and can be measured by a multimeter.
The pull-in current refers to the minimum current that the relay can generate the pull-in action. In normal use, the given current must be slightly larger than the pull-in current, so that the relay can work steadily. As for the working voltage added by the coil, generally, it should not exceed 1.5 times the rated working voltage, otherwise, it will produce a larger current and burn the coil.
The release current refers to the maximum current at which the relay generates a release action. When the current in the relay pull-in state is reduced to a certain extent, the relay will return to the unenergized release state. The current at this time is much smaller than the pull-in current.
Contact switching voltage and current reference to the voltage and current that the relay is allowed to load. It determines the size of the voltage and current that the relay can control, and it cannot exceed this value when used, otherwise, it will easily damage the contacts of the relay.
With separate nominal value and bandwidth setting, and advanced CPU control circuit, it can maintain accurate output adjustment. Optional line loss compensation, digital readings for PT power and dead zone settings, automatic reset after voltage correction, solid-state circuit, single-pulse operation of control relay, self-test facility, continuously adjustable delay setting, internal Control failure alarm contacts for the blocking function (optional function in 301M), and UV alarm contacts with internal blocking function.
Provide 100% protection, can provide full protection during high voltage, low pressure, high temperature, and short circuit. The LED indicator of the digital automatic voltage regulator relay is used to indicate the rising and falling pre-signals and Undervoltage/overvoltage and the working status of the relay. The integrated tap position indicator in AVR EE-301T has an optional 4- 20mA output.
Electromagnetic relays are generally composed of an iron core, coil, armature, contact reed, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating electromagnetic effects, and the armature will attract the iron core against the pulling force of the return spring under the action of electromagnetic force attraction, thereby driving the armature. The moving contact and the static contact (normally open contact) attract.
When the coil is de-energized, the electromagnetic suction will also disappear, and the armature will return to the original position under the reaction force of the spring, causing the moving contact to attract the original static contact (normally closed contact). This pulls in and releases, thus achieving the purpose of turning on and off in the circuit. For the "normally open, normally closed" contacts of the relay, it can be distinguished in this way: the static contact in the off state when the relay coil is not energized is called the "normally open contact"; the static contact in the on the state is called It is "normally closed contact".
A thermal reed relay is a new type of thermal switch that uses thermal-magnetic material to detect and control the temperature. It consists of a temperature-sensitive magnetic ring, constant magnetic ring, dry reed pipe, thermally conductive mounting sheet, a plastic substrate, and other accessories. The thermal reed relay does not need coil excitation, and the magnetic force generated by the constant magnetic ring drives the switching action. Whether the constant magnetic ring can provide magnetic force to the reed switch is determined by the temperature control characteristics of the temperature-sensitive magnetic ring.
A solid-state relay is a four-terminal device with two terminals as input terminals and the other two terminals as output terminals. An isolation device is used in the middle to achieve electrical isolation of input and output. A solid-state relay (SSR) is a series of single-pole, a normally open, solid-state switching devices that have no moving parts and are capable of tens of millions of working cycles. It is designed to control 120V, 240V or 480V (up to 660V) alternating current (VAC), and provides a zero-voltage switch and 2500VAC isolation between the load terminal and the control signal. The control signal enables the solid-state relay (SSR) to turn on or off the AC load like a traditional mechanical contact switch, without problems related to the mobile contact relay, and can greatly extend the service life.
Solid-state relays can be divided into AC type and DC type according to the type of load power supply. According to the switch type, it can be divided into normally open type and normally closed type. According to the isolation type, it can be divided into a hybrid type, transformer isolation type, and photoelectric isolation type. The photoelectric isolation type is the most.
With measurement and statistical functions, time-stamped event recorder, parallel operation with master/slave/independent options, 16 freely programmable binary inputs, 12 binary outputs, mA input for engine oil and faucet and engine oil, WTI and TAP's mA output provides PT100 as direct input of oil temperature.
It is controlled by the fan and pump of the transformer, and the direct resistance input of the pen pressure indicator of the tap is tapped. The limit monitoring of all measurement quantiles can record the hot spot temperature and service life consumption. The winding and top oil also have remote temperature indication and Capable of automatic/manual and local/remote multi-select control, retrofit or cooler control and temperature alarm and trip facility.
Switching regulator
The switching regulator uses the output stage to repeatedly switch between the "on" and "off" states, together with energy storage components (capacitors and inductors) to generate the output voltage. The switching regulator can also produce an output voltage higher than the input or opposite polarity, which is not possible in a linear design. Its adjustment is achieved by adjusting the switching timing according to the feedback samples of the output voltage. In a fixed-frequency voltage regulator, the switching timing is adjusted by adjusting the pulse width of the switching voltage, which is called PWM control. In gated oscillators or pulse mode regulators, the width and frequency of the switching pulses are kept constant, but the "on" or "off" of the output switch is controlled by feedback.
Depending on the arrangement of switches and energy storage components, the output voltage generated can be greater or less than the input voltage, and multiple output voltages can be generated with one regulator. In most cases, under the same input voltage and output voltage requirements, pulse (buck) switching regulators are more efficient than linear regulators to convert power supplies. Compensation --- High-precision AC compensation type stabilized power supply (single-phase 0.5kVA and above, three-phase 1.5kVA and above) has a compensation transformer and has a 110V output.
Linear regulators are based on devices that operate in their linear region (in contrast, switching regulators are based on devices that are forced to act as on/off switches). Linear regulators use transistors or FETs operating in their linear region to subtract the excess voltage from the applied input voltage to produce a regulated output voltage. The so-called drop voltage refers to the minimum value of the difference between the input voltage and the output voltage required by the regulator to maintain the output voltage within 100mV above and below its rated value. Positive output voltage LDO (Low Dropout) regulators usually use power transistors (also known as pass devices) as PNPs. This type of transistor allows saturation, so the regulator can have a very low voltage drop, usually around 200mV; compared to conventional linear regulators using NPN compound power transistors, the voltage drop is around 2V. The negative output LDO uses NPN as its transmission device, and its operating mode is similar to that of the positive output LDO PNP device.
We also have an ultra-high cost-effective three-phase servo voltage regulator, which can protect electronic equipment by tripping in the case of high voltage or low voltage(power transformer). In the case of commercial power, automatic high and low voltage protection (trip) exceeds The range of the stabilizer or the control circuit has failed. There may or may not be a delay circuit. At the same time, our three-phase stabilizer can also provide single-phase protection, as well as overload/short circuit protection through MCB or MCCB. If you want to choose a different servo regulator cooling method, we can also perform two different regulator cooling methods according to your requirements: air cooling and oil cooling.
How to distinguish between relay type and motor type regulators:
You can open it directly to see that there is a ring coil in the motor regulator, and there is a motor in the middle of the ring coil. The motor drives the carbon brush to slide. It can also be distinguished by sound. The sound of the carbon brush sliding is a motor type regulator, and the relay often sounds the relay type. The output voltage of the motor type regulator is relatively stable, and the output of the relay type regulator The voltage has a step.