A Novel Self-Driven Modular Current Limiting Device
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A technology for driving modules and current limiting devices, which is applied to power devices inside switches, emergency protection circuit devices for limiting overcurrent/overvoltage, circuit devices, etc., to achieve the effect of facilitating modular design
Active Publication Date: 2021-05-11
DALIAN UNIV OF TECH
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The current superconductors and positive temperature coefficient resistors all have variable impedance characteristics, but it is difficult to meet the requirements of practical applications.
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Embodiment 1
[0044] A novel self-driven modular current-limiting device includes a high-voltage rheostat R, a reactor L8, and a circuit breaker CB. After the high-voltage rheostat R and the reactor L8 are connected in parallel, they are connected in series with the circuit breaker CB.
[0045] The operation mode of the new self-driven modular current limiting device is:
[0046] (3) During normal operation, the circuit breaker CB is closed, and the resistance value of the high-voltage rheostat R is the smallest, close to zero resistance, bearing the system current, and the loss of the current limiting device is very small;
[0047] (4) When a fault occurs, the resistance of the high-voltage rheostat increases rapidly, and the current is gradually transferred to the L8 branch of the reactor, thereby limiting the rising rate and peak value of the fault current. At the same time, the circuit breaker opens to break the fault current after the current limit.
[0048] The technical scheme of the...
Embodiment 2
[0069] Figure 4 It consists of 12 5kV / 20kA self-driven variable impedance modules in parallel with 2 series to form a self-driven DC FCL. If it is used in a DC 10kV / 120kA system, the rated voltage of each module is 5kV, and the volume of the metal slider is reduced by one-third First, while the short-circuit current is the same, the electromagnetic force remains unchanged, the speed of the slider can be greatly increased, and the insulation requirements of the module will also be reduced.
[0070] The characteristics of the self-driven variable impedance module proposed by the present invention are:
[0071] (1) The resistance value can change continuously from zero to a larger value;
[0072] (2) It can withstand large current and high voltage for a short time (its working condition is close to the closing resistance of high-voltage circuit breaker, so ZnO ceramic resistance can be selected);
[0073] (3) No need for detection and control devices, self-driven, quick respon...
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Abstract
The present invention is a field of current -type self -driving modular flow limit device in the field of transmission and distribution network failure current.A new type of self -driving modular flow limit device, including electric antibody L, circuit breaker CB, high -voltage variable resistor R, high -voltage variable resistor R packet with the electric antibody L, and connect with the circuit breaker CB.The ceramic resistance of the ceramic resistance is door -shaped, with a slide rail on the inside, and the lower end of the ceramic resistance is connected to the L -shaped electrode. The electrodes on both sides of the ceramic resistance are parallel, and the liquid metal slider is vertical.In the lower end of the liquid metal slider, there is insulation parts.The electrodes on both sides are connected to the ends of the electric antibody L, respectively, and the high -voltage variable resistor R is connected to the electrical resistor L.Because the invention is a blocking impedance module as a resistance load, the current limit and current will not generate overvoltage and current; the self -driving variable impedance module and the current restricted electrical resistor are convenient for modular design.Essence
Description
technical field [0001] The invention belongs to the technical field of fault current limiting in power transmission and distribution networks, and relates to a novel self-driven modular current limiting device. Background technique [0002] The root cause of the short-circuit current in the power system is the sudden drop in impedance, which causes the system impedance to be too low, causing the short-circuit current to exceed the standard or rise rapidly. The principle of limiting the short-circuit current is mainly to prevent the system impedance from being too low and to compensate for the sudden drop of impedance in time. Therefore, it is necessary to use a fault current limiter (Fault Current Limiter, FCL) device to limit the rising rate or stable value of the fault current to ensure that the fault current can be cut off reliably. [0003] The current FCL mainly achieves the purpose of current limiting by changing the impedance of the components that have been connecte...
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