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Semi-insulated and fully insulated neutralizers are two common devices for eliminating harmonics in power systems. Their differences mainly lie in their limitations on the system grounding mode and their impact on the electromagnetic compatibility of the system.
1. Grounding mode restriction
The semi-insulated damper is suitable for the case where the system grounding mode is neutral ground, because it needs to isolate the harmonic voltage through the capacitor and connect to the system ground point. If the grounding mode is non-neutral ground or no ground, the damper will not work normally. The fully insulated detuning device is not limited by the grounding method of the system, because it is mainly achieved by reducing and filtering the harmonic voltage, so it can be applied to a variety of different grounding methods.
The semi-insulated damper will produce a large capacitance current, which will form an additional current path in the system, which may have a certain impact on the electromagnetic compatibility of the system, and it may also produce system imbalance factors in the neutral ground system.
The fully insulated damper has no capacitor ground, so it does not generate additional current path and has less impact on the electromagnetic compatibility of the system.
In summary, the semi-insulated damper is suitable for neutral ground systems, but in other cases need to be carefully selected; The fully insulated damper is more common, but it is necessary to pay attention to its configuration and performance requirements for the system.
1 The difference between semi-insulated and fully insulated sterilizers is the difference in their insulation levels.
2 The insulation level of the semi-insulated eliminator is level B, and the insulation level of the fully insulated eliminator is level F. Therefore, the fully insulated eliminator can better eliminate harmonics in the power grid while ensuring safety.
3 In addition, the fully insulated damper can also prevent lightning strikes and overvoltage to a certain extent, and has better comprehensive performance.
The semi-insulated damper is suitable for some low voltage, low harmonic occasions.
The semi-insulated voltage suppressor can only withstand phase voltage in normal operation, and the fully insulated voltage suppressor can withstand line voltage in operation.
The semi-insulation is equipped with a special harmonic reducer on the secondary open triangle winding, or a parallel bulb or a parallel electrical impedance resonance, and can also be tuned in a series resistance at a high voltage neutral point.
Full insulation due to normal operation in the step-down operation state, the magnetic performance is better.
1 Both semi-insulated and fully insulated sterilizers are devices used to eliminate harmonics and clutter in circuits, but they differ in material and construction.
2 Semi-insulated neutralizers use semiconductor materials as capacitors, which are simple in structure and low in cost, but their capacity and voltage levels are limited, and they are only suitable for low-power circuits.
3 Fully insulated eliminators use insulating materials as capacitors, can withstand higher voltages and currents, and have larger capacity, which is suitable for high-power circuits, but the cost is relatively high.
4 Therefore, the choice of semi-insulated damper or fully insulated damper should be determined according to the specific circuit requirements and power requirements.
1 Both semi-insulated and fully insulated sterilizers are devices used to remove harmonics from power systems, but there are some differences between them.
2 Semi-insulated damper means that in a power system, the insulation level of the equipment connected to the damper (such as capacitors) is lower than the insulation level of the system, and the fully insulated damper means that the insulation level of the equipment connected to the damper is the same as the insulation level of the system.
3 Because the insulation level of the equipment connected to the semi-insulated damper is lower than the insulation level of the system, it needs to be more careful when used to avoid safety problems such as leakage.
The fully insulated damper is more stable and reliable.
4 In general, the fully insulated damper is safer and more reliable than the semi-insulated damper, but its cost is relatively higher.
The choice of a damper needs to be evaluated and considered on a case-by-case basis.
1, the difference between semi-insulated and fully insulated eliminator is that the semi-insulated eliminator only leads the harmonic current out of the insulation, but does not eliminate the harmonic voltage; The fully insulated damper can eliminate harmonic current and voltage simultaneously. 2, the reason why the semi-insulated damper only handles harmonic currents is that its structure is simple, the price is low, and it is suitable for some cases that need to reduce harmonic current but do not need to reduce harmonic voltage.
3, and the fully insulated harmonic eliminator because of its more complex circuit structure, can simultaneously handle harmonic current and voltage, suitable for more stringent harmonic control requirements.
Therefore, in practical applications, different types of harmonic eliminator should be selected according to actual needs.
Semi-insulated eliminator and fully insulated eliminator are used to eliminate harmonics in the power system equipment, semi-insulated eliminator is the steel core inductor and capacitor in series, the neutral point is grounded through the inductor, the harmonic current is taken from the middle, the harmonic voltage is connected to both ends, so the two ends of the harmonic voltage and the earth is insulated, but the neutral is grounded, the neutral point can be charged. The fully insulated damper is based on the semi-insulated damper, and the two ends of the steel core inductor are respectively connected to the capacitor without grounding.
Because fully insulated detuning does not require neutral grounding, it can provide better insulation performance, there will be no grounding problems and camera desynchronization problems, but also because there is no grounding, the corresponding ground capacitance current is larger than the semi-insulated detuning device, so more attention needs to be paid to related safety issues.
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Semi-insulated neutralizer and fully insulated neutralizer are used to eliminate harmonic problems in power systems. The biggest difference between them is the quantity and quality of the insulation layer.
A semi-insulated damper is made of an insulating material covered copper coil in which the wound copper coil is placed around an iron core. This winding is designed to allow the current to flow inside the core, because the current flow inside the core has a damping effect, so it can eliminate harmonics. This kind of damper is called semi-insulated because it uses two materials: insulation material and iron core.
The working principle of a fully insulated damper is similar to that of a semi-insulated damper. However, they use a fully insulated material instead of a semi-insulated material to make the winding. These fully insulated winding insulation materials are better than semi-insulated winding insulation materials, which can effectively prevent media damage, arc breakdown and other problems. Therefore, the working stability of the fully insulated damper is better than that of the semi-insulated damper. In summary, the semi-insulated damper is mainly made of a copper coil covered by an insulating material and placed around the iron core, and its winding is therefore called semi-insulated. The fully insulated damper uses the fully insulated material to make the wire winding, and the working stability is better.
1 Both semi-insulated and fully insulated sterilizers are devices used to eliminate harmonics in power systems, but there are differences between the two.
2 One side of the semi-insulated damper is connected to the neutral point of the power system, and the other side is connected to the ground, which can eliminate the odd harmonics in the power system, but the suppression effect of the dual harmonics is poor.
3 Fully insulated harmonic eliminators can eliminate odd harmonics and even harmonics at the same time, and its structure is more complex, but the effect is better in the power system.
4 In short, the difference between semi-insulated and fully insulated sterilizers lies in the effect and structural complexity of the sterilizer.
Fully insulated and semi-insulated primary neutralizers are two different kinds of electrical equipment designed for harmonics and interference in high voltage power system. They differ in the insulation materials used.
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An insulating material is used between the winding and the core of a fully insulated primary eliminator to ensure that current flows through the winding and does not leak to the core or other components. This can effectively avoid the leakage problem of high voltage circuit.
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A semi-insulated material is used between the winding and the core core of the semi-insulated primary eliminator, which can reduce the volume and weight of the equipment while ensuring a certain insulation performance, and improve the reliability and service life of the equipment.
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Therefore, the fully insulated primary eliminator is more superior in insulation performance, but it is also more bulky and expensive, and is suitable for power systems with higher voltage levels; The semi-insulated primary eliminator is lighter in volume and weight, lower in cost, and suitable for power systems with lower voltage levels.
1, semi-insulated and fully insulated neutralizers are used to eliminate capacitive current in the power system reactive power compensation equipment, their role is similar. 2, the semi-insulated damper is only grounded at one end, while the other end needs to be connected with a low-resistance grounding electrode, and the effective distance from the power grid access point shall not exceed 10 kilometers. 3, the fully insulated damper needs to be connected with the low resistance ground electrode at both ends.
It is suitable for capacitive reactive power compensation at long distances from the power supply, up to 60 km from the grid access point. 4, therefore, the difference between semi-insulated and fully insulated damper is the connection method and scope of application.
In a power system, it is critical to select the right equipment according to the actual reactive power compensation needs and distance factors.
Semi-insulated and fully insulated vibrators are the most commonly used vibrators in DC power transmission. They are used to eliminate harmonic interference in DC power transmission.
Semi-insulated eliminator means that the middle point of the eliminator is only insulated from the ground, so it is necessary to keep the middle point isolated when used to prevent the grounding from causing the current to short circuit.
The fully insulated sterilizer means that the middle point of the sterilizer is also insulated from the ground, so it is more convenient to use and can be grounded at will.
Compared with the semi-insulated damper, the fully insulated damper has higher safety, but its price is also relatively higher, so it is necessary to choose the appropriate damper according to the needs in the specific application.