1. Reference standards:
The design, manufacture, inspection, testing and characteristics of this device comply with the latest applicable IEC standards and Chinese national standards (GB) and power industry (DL) standards, in addition to meeting specified special standards.
GB 4208 Enclosure protection level (IP code)
GB/T 16935.1 Insulation coordination of equipment in low-voltage systems
GB/T 17626.2 Electrostatic discharge immunity test
GB/T 17626.3 Radio frequency electromagnetic field radiation immunity test
GB/T 17626.4 Electrical fast transient burst immunity test
GB/T -12325 Power quality supply voltage allowable deviation
GB1094. mouth power transformer
GB6450-86 dry type power transformer
GB10230-88 on-load tap-changer
J Bff 8314-96 On-load tap changer test guide
GB10237-88
JB/T501-91
DL/T 1053
GB50150-91
Insulation level and insulation testing of power transformers, air gaps for external insulation
Power Transformer Test Guidelines
Power quality technical supervision regulations
Standard for handover test of electrical equipment for electrical installation installation projects
If there are new standards above, the new standards will apply.
2. Introduction to HYDVT intelligent line low-voltage voltage regulating device:
Purpose of the device: According to the national standard GB/T-12325, the voltage drop of my country's transmission lines needs to be within - 10% ~ +7%. In order to ensure that the actual voltage level of distribution lines is within the allowable range of electrical equipment, the length of the line should generally be kept within a reasonable distance and should not be overloaded. The actual situation is often that as people's living standards continue to improve, the electricity load also continues to increase. Due to limited conditions, many lines can only be extended accordingly. The increase in lines and electricity load causes their own impedance to increase accordingly. As a result, the line voltage cannot remain relatively stable. When the actual voltage exceeds the allowable fluctuation range of normal voltage, the end user voltage even exceeds the operating voltage range of electrical equipment. It will inevitably seriously affect the normal use of the power system and electrical equipment, making it impossible to use or damage electrical appliances. In my country's rural distribution network, most lines commonly have conditions such as excessive power supply radius, small wire diameter, and strong time-varying load fluctuations. Therefore, substandard voltage at the end of lines in my country's rural distribution network is inevitable. Electrical equipment: Voltage quality has a direct impact on the safe and economical operation of various types of equipment. Taking an asynchronous motor as an example, if the voltage decreases, the voltage torque will decrease, resulting in an increase in slip, which will significantly increase the stator and rotor currents, causing the motor temperature to rise, and may even burn the motor. On the contrary, when the voltage is too high, the excitation current and iron loss will increase greatly, causing the motor to overheat and reduce efficiency. Low voltage will also affect the use of household appliances. When the voltage is 10% lower than the rated voltage, the flux of the incandescent lamp is reduced by 30%; when the voltage is 10% higher than the rated voltage, the life of the bulb is reduced by half. Low voltage will also affect a series of problems such as air conditioning operation, mobile phone charging, and TV signal reception capabilities. System loss: When the transmission power is certain, the system loss is inversely proportional to the square of the operating voltage. If the voltage decreases, the current and loss will increase, and the system loss will also become larger. The unbalanced operation of the distribution transformer will increase the neutral current, increase the copper loss and iron loss of the transformer, reduce the operating efficiency of the transformer, and affect the safe operation of the transformer. Product Introduction: HYDVT The series of smart line low-voltage voltage regulators are line-specific voltage regulators developed mainly for the poor and unstable power supply quality caused by long power supply lines and large load fluctuations in my country's rural 380V/220V low-voltage distribution networks, such as power supply voltage drops and large voltage drops. The voltage regulator module increases the range of tap voltage regulation and improves the voltage regulation capability of the transformer tap switch. By adjusting and compensating the voltage in the middle or at the end of the line, it effectively solves user voltage quality problems and ensures normal power supply.
3. Product model and usage conditions:
The conditions of use are as follows:
1.Adjustment mode - contactor - thyristor
2.Rated capacity (kVA)
3.Rated voltage (kV)
4. Design serial number, F - sub-modulation, - co-modulation
Intelligent line low voltage voltage regulating device
1. Applicable to 220/380V, 50Hz power grid system; can also be used in 110V 60Hz power grid system, but needs to be communicated in advancebright;
2. Do not store in places where the relative air humidity exceeds 90% for a long time;
3. The altitude does not exceed 2000m;
4. Ambient temperature - 10 7 ~ +50't;
5. There is no serious vibration or violent bumps at the installation site, and there is no gas, steam, dust, dirt, chemical precipitation that seriously affects the insulation of the voltage regulator.Accumulation, mold and other flammable, explosive and corrosive media.
Note: The devices must be installed in series and cannot be operated in parallel.
4. Working principle:
5. Product advantages and features:
The working mechanism of the voltage regulating device is: connect the smart line low-voltage voltage regulating device in series near the load at the end of the line. When the load voltage is qualified, the voltage regulating device stops working and enters the bypass state; when the voltage at the load is lower than the lower limit of the specified value or higher than the upper limit of the specified voltage, the voltage regulating device is automatically put in, and the voltage at the load is adjusted to AU, so that the voltage at the load reaches the qualified voltage value.
The principle of the HYDVT three-phase low-voltage voltage regulating device is similar to this, except that three phases are used to regulate the voltage of the neutral line separately, so that the three-phase voltage regulation does not interfere, and avoids the problem that the regulating mechanism is difficult to handle due to the unbalanced three-phase voltage of one phase being low and the voltage of another phase being high. Three-phase co-modulation products can also be selected according to the load category of the site conditions.
The device consists of a dedicated controller for intelligent line voltage regulation, a single-phase transformer, a tap changer, a box and other components.
Intelligent control: The product takes the target voltage as the criterion, adopts the target optimization algorithm, and can operate automatically or manually. Using a special tap-changer, the voltage can be adjusted without inrush current. Taking boost regulation as an example, as shown in the figure, the outlet voltage of the terminal transformer is Us, and the load current forms a voltage drop on the line. When the line is too long or the load increases, the voltage at L2 may be lower than the minimum allowed value of the rated voltage. Install a series voltage regulating device at L2. The device is in boost mode and increases the voltage by AU, so that the voltage UL at the load end is increased to U+l::..U to reach the rated voltage value. 220V+7% Us v According to the voltage and load requirements of the power grid and electrical equipment, it is easy to expand the capacity and the voltage adjustment is smoother.
It can form a HYDVT three-phase intelligent line low-voltage voltage regulating device to control unqualified voltage and improve the three imbalance problems at the same time.
Multiple protections: overvoltage, undervoltage protection, transient overvoltage protection, harmonic protection function, short circuit protection, temperature protection (each protection limit can be set).
Safety: Safe automatic bypass control system.
Long life: Unique voltage regulating tap changer design avoids arcing during voltage regulation.
Maintenance-free: fully sealed design, high protection level, excellent weather resistance, maintenance-free for a long time.
Flexible: It can be flexibly installed in lines and substations, and can exit operation and switching functions when necessary.
Strong functions: Provides RS485 5G/4G data interface, which can achieve remote control, telemetry, and realize distribution network automation. With a variety of communication protocols, it can communicate directly with the main station.
Low loss: The design minimizes iron loss and no-load loss.
Economical: It can adjust line voltage economically and effectively, greatly reduce line loss and extend the service life of equipment.
L HYDVT intelligent line low-voltage voltage regulating device standard type has a total of 3-5 gears, including 2-4-way boost adjustment gears and bypass gears.
The device has two modes: automatic pressure regulation and manual pressure regulation. Automatic pressure regulation is the main mode and manual pressure regulation is the supplement. It is mainly composed of adjustable transformer, tap changer, circuit breaker, controller, DC stabilized power supply, current transformer, compensation capacitor and box.
L1 L2 L3 When ordering, please specify the voltage level (single-phase or three-phase) and capacity (such as 5kVA, 1 OkVA, 15kVA, 30kVA models). If you have special needs, please contact us in advance.
6. Installation diagram:
7. Main technical parameters:
