A reactor turn-to-turn short-circuit fault protection method and device

An inter-turn short-circuit fault and reactor technology, which is applied to circuit devices, emergency protection circuit devices, components of emergency protection devices, etc., can solve problems such as loss of maintenance value, damage to reactor windings, and small current variation. The effect of avoiding protection malfunction, saving equipment cost and improving reliability

CN112688273BActive Publication Date: 2022-06-28GUODIAN NANJING AUTOMATION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-06-28

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Abstract

The invention discloses a reactor interturn short-circuit fault protection method and device applied to a braking energy capacitor energy storage device, and belongs to the technical field of reactor protection. Utilizing the characteristics of the instantaneous consumption of a large amount of energy caused by the inter-turn short circuit fault of the reactor, which leads to the decrease of the operating efficiency of the braking energy capacitor energy storage device, and the change of the equivalent DC resistance value of the reactor as the double judgment conditions, the trip signal of the circuit breaker is output and uploaded to the HMI The display interface gives an alarm, so as to realize the effective protection of the short-circuit fault of the reactor. The invention does not need to add additional equipment, and only uses the components of the braking energy capacitor energy storage device itself to collect signals, logical operations, and trigger protection, which not only saves equipment costs, but also improves the rapidity and reliability of the reactor turn-to-turn fault protection .
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Description

technical field

[0001] The invention belongs to the technical field of fault protection of electric power equipment, and in particular relates to a method for protecting an inter-turn short-circuit fault of a reactor, and also relates to a device for protecting an inter-turn short-circuit fault of a reactor. Background technique

[0002] Dry-type reactors have been widely used in large-scale power equipment, but in the long-term operation process, the problem of aging of the insulating medium will occur. If there are external factors stimulated, there may be localized parts where the insulation layer on the surface of the reactor is relatively weak. Discharge, damage the turn-to-turn insulation, and gradually develop into a short-circuit fault. The short-circuit current causes the temperature of the faulty part to rise sharply, which further leads to the destruction of the insulation between adjacent turns, and finally causes the partial overheating of the reactor or even fi...

Examples

Embodiment 1

[0048] The invention provides an inter-turn short-circuit fault protection method for a reactor, which is suitable for the inter-turn short-circuit fault protection of an internal smoothing reactor by a DC 750V / 1500V urban rail transit braking energy capacitor energy storage device. Its structure diagram is as follows figure 1 As shown, in the main circuit of the braking energy capacitor energy storage device, a voltage sensor LV1 and a current sensor CT1 are installed on the DC750V grid side, and a voltage sensor LV2 and a current sensor CT2 are installed on the capacitor side to collect voltage and current respectively. The front end of the DC reactor L is connected to the IGBT module, and the rear end is connected to the capacitor group C2. The DC grid side circuit breaker QF is used to protect the main circuit. The sampling board in the control circuit is used to convert analog and digital quantities, the IO signal board is used to output and input switch quantities, the ...

Embodiment 2

[0082] A reactor inter-turn short-circuit fault protection device of the present invention is characterized by comprising: a sampling board, an IO signal board and a control unit;

[0083] Sampling board, used to collect grid-side voltage, capacitor-side voltage, grid-side current and capacitor-side current;

[0084] The control unit is used to judge whether the first judgment condition and the second judgment condition are satisfied at the same time according to the grid-side voltage, the capacitor-side voltage, the grid-side current and the capacitor-side current,

[0085] The first judgment condition is:

[0086] Calculate the equivalent DC resistance of the reactor;

[0087] The error between the equivalent DC resistance of the reactor and the rated equivalent DC resistance exceeds the first preset threshold;

[0088] The second judgment condition:

[0089] Calculate the operating efficiency of the braking energy capacitor energy storage device;

[0090] The difference...