Abstract: Disclosed are an arc discharge detection method and device for a battery system, and a battery energy storage system. The arc discharge detection method for a battery system comprises: sampling a terminal voltage and a charging and discharging current of a battery system, sampling the terminal voltage of the battery system twice and calculating a first voltage difference value, and sampling the terminal voltage of the battery system and a terminal voltage of an electricity load and calculating a second voltage difference value; performing time domain and frequency domain analysis on the sampled data to obtain corresponding time domain and frequency domain feature values; and on the basis of the time domain and frequency domain feature values and the first and second voltage difference values, determining whether arc discharge features are met, so as to determine whether an arc discharge fault occurs in the battery system.

Abstract: The present invention belongs to the technical field of coal mine drills, and relates to a coal mine automatic directional drill, comprising a moving platform, a machine frame, a clamper, a main manipulator, a power head, a drill pipe storage system, a control system and a hydraulic system. In the present invention, a structure of the power head is improved, an angle adjuster is arranged on one side of a gearbox away from a main motor, and a transmission shaft in the angle adjuster is circumferentially and fixedly connected with a driving shaft, thus a toolface azimuth is adjusted accurately and efficiently and a structure of a rotary brake device of the main motor is simplified by the angle adjuster which has functions of accurate angle adjustment, locking and anti-rotation.

Abstract: The present invention belongs to the technical field of coal mine drills, and relates to a coal mine automatic directional drill, comprising a moving platform, a machine frame, a clamper, a main manipulator, a power head, a drill pipe storage system, a control system and a hydraulic system. In the present invention, a structure of the power head is improved, an angle adjuster is arranged on one side of a gearbox away from a main motor, and a transmission shaft in the angle adjuster is circumferentially and fixedly connected with a driving shaft, thus a toolface azimuth is adjusted accurately and efficiently and a structure of a rotary brake device of the main motor is simplified by the angle adjuster which has functions of accurate angle adjustment, locking and anti-rotation.

Abstract: Disclosed are an arc discharge detection method and device for a battery system, and a battery energy storage system. The arc discharge detection method for a battery system comprises: sampling a terminal voltage and a charging and discharging current of a battery system, sampling the terminal voltage of the battery system twice and calculating a first voltage difference value, and sampling the terminal voltage of the battery system and a terminal voltage of an electricity load and calculating a second voltage difference value; performing time domain and frequency domain analysis on the sampled data to obtain corresponding time domain and frequency domain feature values; and on the basis of the time domain and frequency domain feature values and the first and second voltage difference values, determining whether arc discharge features are met, so as to determine whether an arc discharge fault occurs in the battery system.

Abstract: Provided is a method for suppressing common-mode current of neutral line in T-type three-level three-phase inverter, the method of the present disclosure can effectively suppress LC filter resonance contained in the currents of a circulation neutral line and inversion side of a inverter, reduce the common-mode leakage current of the inverter, and improve the performance of the inverter.

Abstract: Provided is a method for suppressing common-mode current of neutral line in T-type three-level three-phase inverter, the method of the present disclosure can effectively suppress LC filter resonance contained in the currents of a circulation neutral line and inversion side of a inverter, reduce the common-mode leakage current of the inverter, and improve the performance of the inverter.

Abstract: Embodiments of the present invention disclose a method, an apparatus, and a system for diverting a packet multiple times between a master network device and multiple slave devices. The method includes: receiving a packet sent by a first slave device, where the packet includes an MPLS header that carries multi-diversion information, the multi-diversion information includes a multi-diversion identifier field, and the multi-diversion identifier field is used to indicate a slave device to which the packet needs to be diverted; determining, according to the multi-diversion identifier field, a second slave device to which the packet needs to be diverted; and sending the packet to the second slave device.