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Damping resistor box
In order to prevent the unbalanced voltage of the neutral point of the grid system from increasing due to the input and measurement of the arc suppression coil when the arc suppression coil of the pre-adjustment compensation mode is working under the normal state of the power grid, it is researched and designed. When the power grid is running normally, adjust the inductance of the arc suppression coil to an appropriate position in advance, but at this time the inductance and capacitive reactance are approximately equal, which will make the power grid in a state close to resonance, causing the neutral point voltage to rise. In order to prevent this If the phenomenon occurs, a damping resistor device is added to the arc suppression coil compensation device in the pre-adjustment mode, so as to suppress the displacement voltage of the neutral point to the required proper position and ensure the normal operation of the power supply network.
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Complete set of phase-controlled arc suppression coil
Structural principle description
The phase-controlled arc suppression coil is also called “high short-circuit impedance type”, that is, the primary winding of the arc suppression coil in the complete device is connected to the neutral point of the distribution network as the working winding, and the secondary winding is used as the control winding by two reversely connected The thyristor is short-circuited, and the short-circuit current in the secondary winding is adjusted by adjusting the conduction angle of the thyristor, so as to realize the controllable adjustment of the reactance value. adjustable.
The conduction angle of the thyristor varies from 0 to 1800, so that the equivalent impedance of the thyristor varies from infinity to zero, and the output compensation current can be continuously adjusted steplessly between zero and the rated value.
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Capacitance-adjustable arc suppression coil complete set
Structural principle description
The capacity-adjusting arc suppressing coil is to add a secondary coil to the arc suppressing coil device, and several groups of capacitor loads are connected in parallel on the secondary coil, and its structure is shown in the figure below. N1 is the main winding, and N2 is the secondary winding. Several groups of capacitors with vacuum switches or thyristors are connected in parallel on the secondary side to adjust the capacitive reactance of the secondary side capacitor. According to the principle of impedance conversion, adjusting the capacitive reactance value of the secondary side can meet the requirement of changing the inductor current of the primary side. There are many different permutations and combinations for the size of the capacitance value and the number of groups to meet the requirements of the adjustment range and precision.
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Complete set of bias magnetic arc suppression coil
Structural principle description
Biasing type arc suppressing coil adopts the arrangement of a magnetized iron core segment in the AC coil, and the magnetic permeability of the iron core is changed by applying a DC excitation current, so as to realize the continuous adjustment of the inductance. When a single-phase ground fault occurs in the power grid, the controller instantly adjusts the inductance to compensate the ground capacitance current.
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HYXHX series intelligent arc suppression device
In my country’s 3~35KV power supply system, most of them are neutral point ungrounded systems. According to national regulations, when a single-phase grounding occurs, the system is allowed to run with a fault for 2 hours, which greatly reduces the operating cost and improves the reliability of the power supply system. However, due to the gradual increase in the power supply capacity of the system, the power supply mode is The overhead line is gradually transformed into a cable line, and the capacitance current of the system to the ground will become very large. When the system is single-phase grounded, the arc formed by the excessive capacitive current is not easy to extinguish, and it is very likely to evolve into intermittent arc grounding. At this time, the arc grounding overvoltage and the ferromagnetic resonance overvoltage excited by it will be It seriously threatens the safe operation of the power grid. Among them, the single-phase arc-ground overvoltage is the most serious, and the overvoltage level of the non-fault phase can reach 3 to 3.5 times the normal operating phase voltage. If such a high overvoltage acts on the power grid for several hours, it will inevitably damage the insulation of electrical equipment. After several times of cumulative damage to the insulation of electrical equipment, a weak point of insulation will be formed, which will cause an accident of ground insulation breakdown and short circuit between phases, and at the same time cause insulation breakdown of electrical equipment (especially the insulation breakdown of the motor) ), the cable blasting phenomenon, the saturation of the voltage transformer stimulates the ferromagnetic resonance body to burn down, and the explosion of the arrester and other accidents.
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Complete set of turn-adjusting arc suppression coil
In the transformation and distribution network system, there are three types of neutral point grounding methods, one is the neutral point ungrounded system, the other is the neutral point through the arc suppression coil grounding system, and the other is the neutral point through the resistance grounding system system.
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HYSVG Static Var Generator
Fundamental
The basic principle of STATCOM, a static var generator (also known as SVG), is to connect the self-commutated bridge circuit directly in parallel with the power grid through the reactor, and properly adjust the phase and amplitude of the output voltage of the AC side of the bridge circuit or directly control Its AC side current can make the circuit send out reactive current that meets the requirements, and realize the purpose of dynamic reactive power compensation.
Three working modes of SVG -
HYSVG outdoor column type three-phase unbalance control device
The newly launched HYSVG on the outdoor column of our company fully responds to the “Special Investigation and Treatment of Low-Voltage Problems” and “Notice of Technical Principles for Low-Voltage Control of Distribution Networks” proposed by the state, which can effectively control the three-phase problems existing in the transformation and upgrading of distribution networks. Key issues such as unbalance, low terminal voltage, bidirectional compensation of reactive current and harmonic pollution; improve voltage quality in real time. Raise the terminal voltage, improve the quality of power distribution, and improve the power environment; solve the problem of three-phase imbalance, greatly reduce the loss of low-voltage distribution network lines and transformers, and prolong the life of the transformer; make the reactive power achieve local balance and increase the power factor Distribution network output capacity; perfect solution to harmonic pollution caused by nonlinear loads.
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HYSVG series high voltage dynamic reactive power compensation device
HYSVG series high-voltage dynamic reactive power compensation device is a reactive power compensation system with IGB as the core, which can quickly and continuously provide capacitive or inductive reactive power, and realize the control of constant reactive power, constant voltage and constant power factor at the assessment point. Ensure the stable, efficient and high-quality operation of the power system. In the distribution network, installing small and medium-capacity HYSVG products near some special loads (such as electric arc furnaces) can significantly improve the power quality at the connection point between the load and the public grid, such as improving power factor and overcoming three-phase imbalance. , Eliminate voltage flicker and voltage fluctuations, suppress harmonic pollution, etc.
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HYSVGC series hybrid static var dynamic compensation device
The low-voltage hybrid active dynamic reactive power compensation device is installed in the low-voltage power distribution system to improve the voltage quality of low-voltage power distribution, improve the operation and management level of reactive power compensation, and better serve power customers. In the original low-voltage reactive power automatic A low-voltage active hybrid dynamic reactive power compensation device that is upgraded and expanded on the basis of the compensation device.
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HY-HPD series harmonic protector
HY-HPD-1000 uses a wave protector to protect various precision control equipment in a harmonic environment, such as computers, PLCs, sensors, wireless equipment, CT machines, DCS, etc., so that the paint is free from harmonic hazards. The use of HY-HPD-1000 wave protector reduces the failure rate of equipment and machine misoperation, improves the operating efficiency and service life of equipment, and fully overcomes the poor power quality caused by high-order harmonics on the user side, which leads to Equipment wear and tear, performance failure, resulting in unnecessary losses.
HY-HPD-1000 fully complies with IEC61000-4-5, IEC60939-1-2 and other standards.
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HYAPF series active filter
In order to further meet the diversified needs of different customers for active power filters and improve the intelligence, convenience and stability of harmonic control, the company has launched a new modular three-level active filter device.
