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A multi-stage series discharge gap with frequency-selective characteristics and its working method
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A discharge gap and series discharge technology, which is applied to emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problems of high damage rate of arresters, high cost of arresters, and high requirements for arrester groups
Active Publication Date: 2020-03-17
XI AN JIAOTONG UNIV
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Problems solved by technology
The current protection using a single arrester group has high requirements for the arrester group, and the cost of the arrester is very high, and the damage rate of the arrester is relatively high under the action of operating overvoltage and lightning overvoltage for a long time
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Embodiment 1
[0046] This embodiment is a three-stage series discharge gap, such as figure 2 shown.
[0047] The resistance-capacitance components in the figure are the same, take C1=C2=C3=1uF and Rc=10MΩ, the value of the voltage dividing inductance is L1=L2=L3=100mH, and the value of the voltage dividing resistance is R1'=R2'=R3=10kΩ And R3'=R2=R1=1kΩ, the parallel capacitance C on the resistor R3 0 = 10nF.
[0048] When the operating overvoltage acts on the three-level series discharge gap, the voltage is divided by the voltage dividing resistors at each level, and the discharge gap G3 is divided into about 85% of the operating overvoltage amplitude. G3 breaks down and conducts, and R2' is connected after G3 breaks down Into the subsequent two-stage discharge circuit, at this time, the operating overvoltage is redistributed, and the discharge gap G2 is divided into about 85% of the operating overvoltage amplitude, and G2 breaks down and conducts again. Similarly, the subsequent discha...
Embodiment 2
[0051] In this embodiment, it is a three-stage series discharge gap, such as figure 2 shown.
[0052] The resistance-capacitance components in the figure are the same, take C1=C2=C3=10uF and Rc=10MΩ, the value of the voltage dividing inductance is L1=L2=L3=10mH, and the value of the voltage dividing resistance is R1'=R2'=R3=1kΩ And R3'=R2=R1=100Ω, the parallel capacitance C on the resistor R3 0 =90nF.
[0053] When the operating overvoltage acts on the three-level series discharge gap, the voltage is divided by the voltage dividing resistors at each level, and the discharge gap G3 is divided into about 80% of the operating overvoltage amplitude. G3 breaks down and conducts, and R2' is connected after G3 breaks down Into the discharge circuit, at this time, the operating overvoltage is redistributed, and the discharge gap G2 is divided into about 80% of the operating overvoltage amplitude, and G2 is broken down and turned on again. Similarly, the discharge gap G1 is turned o...
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Abstract
The invention discloses a multilevel series discharge gap with a frequency selection characteristic and a working method thereof. The multilevel series discharge gap comprises a first-level dischargegap circuit to an nth-level discharge gap circuit which are connected successively in series. The nth-level discharge gap circuit is connected with a high voltage wire inlet end HV. The first-level discharge gap circuit is connected with a low voltage wire inlet end LV. Each level of discharge gap circuit comprises a voltage division resistor-capacitor component, a voltage division inductor, a series voltage division resistor, a circuit voltage division resistor and a discharge gap which are connected in sequence. Impulse breakdown voltages and frequencies of the multilevel series discharge gap present a U-shaped curve relationship. Action is not carried out under a direct voltage and a lightning voltage, and each gap is not broken down. The action is carried out under an operation overvoltage, and all gaps are broken down. The multilevel series discharge gap provided by the invention has the frequency selection characteristic. The impulse breakdown voltages and the frequencies of themultilevel series discharge gap present the U-shaped curve relationship. The multilevel series discharge gap can bear impulse voltages with a very low frequency and very high frequency. All gaps are broken down and switched on under the condition that a relatively low frequency is impulse voltage amplitude nearby a resonant frequency f0.
Description
technical field [0001] The invention belongs to the technical field of air gap discharge switches, and in particular relates to a multi-stage series discharge gap with frequency selection characteristics and a working method thereof. Background technique [0002] In the UHV DC power system, the arrester group is mainly used for overvoltage protection against lightning overvoltage and operating overvoltage. The current protection using a single arrester group has high requirements for the arrester group, and the cost of the arrester is very high, and the damage rate of the arrester is relatively high under the action of operating overvoltage and lightning overvoltage for a long time. The operating overvoltage is related to the voltage level of the power system. The higher the voltage level, the higher the operating overvoltage. Compared with the lightning overvoltage, the operating overvoltage under the UHV DC power system is higher and more harmful. Therefore, it is becomin...
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