Power supply device for dynamic resistance analysis of generator outlet circuit breaker

Abstract

The utility model discloses a power supply device for dynamic resistance analysis of a generator outlet circuit breaker. The power supply device comprises a charging power supply, a super capacitor, a charging loop, a discharging loop, a feedback loop and a control loop, the charging power supply is electrically connected with the super capacitor, the charging loop and the output in sequence; the discharge loop and the feedback loop are electrically connected with the super capacitor, the feedback loop is electrically connected with the control loop, and the control loop is electrically connected with the discharge loop; the charging loop and the charging power supply are electrically connected with the control loop; and the current output by the power supply reaches 15kA, so that the dynamic resistance analysis precision of the generator outlet circuit breaker is improved, and the ablation condition of the contact is reflected more accurately.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breaker analysis power supplies and relates to a power supply device for dynamic resistance analysis of a generator outlet circuit breaker. Background Art

[0002] Generator output circuit breakers are critical switchgear in hydropower stations, providing both control and protection. When power plant equipment or the power grid experiences a fault, the circuit breaker must operate reliably to quickly disconnect the faulty component and prevent further expansion.

[0003] The insulation performance of the arc extinguishing chamber of a generator circuit breaker is a key factor limiting the circuit breaker's electrical life. Therefore, it is necessary to test and evaluate the insulation performance within the arc extinguishing chamber. Therefore, a comprehensive analysis of the dynamic resistance of generator circuit breakers is crucial for improving the safety and reliability of power systems.

[0004] The dynamic resistance method is currently the most widely used method for detecting the contact state of circuit breaker arc chamber contacts. Dynamic resistance refers to the dynamic contact resistance during the opening and closing process. In addition to two thicker current wires and two thinner voltage wires connected to the circuit breaker's interrupter, a signal line is used to collect contact velocity signals to obtain dynamic resistance and contact velocity curves during the opening and closing process.

[0005] Currently, the common circuit breaker loop resistance analyzer has a current limit of only 0.2kA, while the rated current of the generator output circuit breaker can reach tens of kA. Therefore, it is necessary to increase the output current of the power supply device for dynamic resistance analysis to the operating state, measure its dynamic resistance, and check the contact erosion. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to provide a power supply device for dynamic resistance analysis of generator output circuit breaker. The current output by the power supply reaches 15kA, which improves the accuracy of dynamic resistance analysis of generator output circuit breaker and more accurately reflects the contact erosion situation.

[0007] To solve the above technical problems, the technical solution adopted by the utility model is: a power supply device for dynamic resistance analysis of a generator output circuit breaker, which includes a charging power supply, a supercapacitor, a charging circuit, a discharge circuit, a feedback circuit and a control circuit; the charging power supply is electrically connected to the supercapacitor, the charging circuit and the output in sequence; the discharge circuit and the feedback circuit are electrically connected to the supercapacitor, the feedback circuit is electrically connected to the control circuit, and the control circuit is electrically connected to the discharge circuit; the charging circuit, the charging power supply and the control circuit are electrically connected.

[0008] The voltage of the supercapacitor is 48V, and a total of 9 16V / 500F capacitors are used, connected in three series and three parallels.

[0009] The charging power supply voltage is 48V, which charges the supercapacitor and provides power for dynamic resistance analysis of the generator output circuit breaker.

[0010] The feedback loop connects the supercapacitor and the control loop, and the discharge loop and the charging power supply are connected to the control loop. When the supercapacitor voltage does not meet the voltage required during the dynamic resistance test, the control loop adjusts the supercapacitor voltage through the charging loop and the charging power supply.

[0011] The maximum current output by the power supply is 15kA, which improves the accuracy of the dynamic resistance analysis result of the generator output circuit breaker and accurately reflects the contact erosion situation.

[0012] The main beneficial effects of the utility model are:

[0013] The problem that the dynamic resistance test current is too small during the actual dynamic resistance test, resulting in inaccurate test results, is solved.

[0014] The degree of contact erosion of the generator output circuit breaker is reflected by the contact resistance of the dynamic and static contacts and the arcing contacts. Increase the test current to the operating state, measure its dynamic resistance, and check the contact erosion.

[0015] When the supercapacitor voltage does not meet the voltage required for the dynamic resistance test, the control circuit adjusts the supercapacitor voltage through the charging circuit and the charging power supply.

[0016] The power supply output current reaches 15kA, which improves the accuracy of dynamic resistance analysis of the generator output circuit breaker and more accurately reflects the contact erosion situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 It is a framework diagram of the utility model;

[0019] Figure 2 This is a simplified circuit diagram of the supercapacitor of the utility model;

[0020] In the figure: charging power supply 1; supercapacitor 2; charging circuit 3; discharging circuit 4; feedback circuit 5; control circuit 6. DETAILED DESCRIPTION

[0021] like Figure 1~Figure 2A power supply device for dynamic resistance analysis of a generator output circuit breaker includes a charging power supply 1, a supercapacitor 2, a charging circuit 3, a discharging circuit 4, a feedback circuit 5, and a control circuit 6. The charging power supply 1 is electrically connected to the supercapacitor 2, the charging circuit 3, and the output in sequence. The discharging circuit 4 and the feedback circuit 5 are electrically connected to the supercapacitor 2, the feedback circuit 5 is electrically connected to the control circuit 6, and the control circuit 6 is electrically connected to the discharging circuit 4. The charging circuit 3 is electrically connected to the charging power supply 1 and the control circuit 6.

[0022] In a preferred solution, the voltage of the supercapacitor 2 is 48V, and a total of 9 16V / 500F capacitors are used, connected in three series and three parallels.

[0023] In the preferred solution, the voltage of the charging power supply 1 is 48V, which charges the supercapacitor 2 and provides power for the dynamic resistance analysis of the generator output circuit breaker.

[0024] In the preferred embodiment, the feedback loop 5 connects the supercapacitor 2 and the control loop 6, and the discharge loop 4 and the charging power supply 1 are connected to the control loop 6. When the voltage of the supercapacitor 2 does not meet the voltage required during the dynamic resistance test, the control loop 6 adjusts the voltage of the supercapacitor 2 through the charging loop 3 and the charging power supply 1.

[0025] In a preferred solution, the maximum current output by the power supply is 15kA, which improves the accuracy of the dynamic resistance analysis results of the generator output circuit breaker and accurately reflects the contact erosion situation.

[0026] Example

[0027] The loop resistance of the generator output circuit breaker is 1~2μΩ. Taking into account the ablation, the maximum test resistance is 1mΩ. The cross section of the test loop current lead is 150mm 2 , the sum of the lead resistance and the contact resistance of the connection part is the loop resistance, R 回路 Less than 1.2mΩ, the equivalent internal resistance of the supercapacitor R 内阻 = 2mΩ.

[0028] Output current I=U / (R 内阻 +R 回路 ); After calculation, the designed output current is greater than 15kA, which can meet the dynamic resistance analysis requirements of the generator output circuit breaker.

[0029] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The embodiments and features therein may be arbitrarily combined unless they conflict. The scope of protection of the present invention shall be the technical solutions described in the claims, including equivalent alternatives to the technical features of the technical solutions described in the claims. Equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A power supply device for dynamic resistance analysis of a generator output circuit breaker, characterized by: It includes a charging power supply, a super capacitor, a charging circuit, a discharging circuit, a feedback circuit and a control circuit; the charging power supply is electrically connected to the super capacitor, the charging circuit and the output in sequence; the discharging circuit and the feedback circuit are electrically connected to the super capacitor, the feedback circuit is electrically connected to the control circuit, and the control circuit is electrically connected to the discharging circuit; the charging circuit is electrically connected to the charging power supply and the control circuit; The feedback loop connects the supercapacitor and the control loop, and the discharge loop and the charging power supply are connected to the control loop. When the supercapacitor voltage does not meet the voltage required during the dynamic resistance test, the control loop adjusts the supercapacitor voltage through the charging loop and the charging power supply.

2. The power supply device for dynamic resistance analysis of a generator output circuit breaker according to claim 1, characterized in that: The voltage of the supercapacitor is 48V, and a total of 9 16V / 500F capacitors are used, connected in three series and three parallels.

3. The power supply device for dynamic resistance analysis of a generator output circuit breaker according to claim 1, characterized in that: The charging power supply voltage is 48V, which charges the supercapacitor and provides power for dynamic resistance analysis of the generator output circuit breaker.

4. The power supply device for dynamic resistance analysis of a generator output circuit breaker according to claim 1, characterized in that: The maximum current output by the power supply is 15kA, which improves the accuracy of the dynamic resistance analysis result of the generator output circuit breaker and accurately reflects the contact erosion situation.

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