32results about How to "Reliable protection function" patented technology

A circuit interrupting device having a reverse wiring protection function is disclosed. The circuit interrupting device includes a housing having a cover and a base, a mounting plate, and an electrical component mounting member, a pair of input hot and neutral conductors and a pair of output hot and neutral conductors, a differential transformer for detecting a leakage current, a disconnecting mechanism for connecting and disconnecting the output conductors to and from input conductors, and a mechanism for preventing reverse wiring, which includes a coil connected to the input hot and neutral conductors and a moveable piece that moves when the coil is energized. The input and output conductors are electrically connected only when the coil is energized by correctly connecting the power wires to the input conductors of the device. This device thus provides both leakage current protection and reverse wiring protection that protects against incorrect wiring during installation.

Aspects of the invention are directed to a three-level power converter that has, as one phase, a bidirectional switching element connected to the series connection point of a series circuit of a first insulated gate bi-polar transistor (“IGBT”) and second IGBT and an intermediate electrode of a direct current power supply. Also included is a fuse connected between the bidirectional switching element and the intermediate electrode of the direct current power supply, and an overcurrent shutdown unit provided in each gate drive circuit of the first and second IGBTs, are provided as protection from a power supply short circuit phenomenon occurring in the event of a short circuit failure of any of the IGBTs or diodes.

The invention belongs to the leading front edge technology in safety and detection and discloses a practical method for realizing electric leakage alarm and power-down control according to bridge drain voltage testing method and principle of automatic control which can also be used in other technical fields aiming at detecting relative drain voltage. The method is applied to the following aspects detailedly: 1. supervision on electrical device drain voltage and production of detecting instruments for dangerous drain voltage. 2. Production of voltage-type (in relation to RCD) electric leakage protector against electric leakage of electrical device that endangers the operator. 3. Safe operation of electrical equipment and remote supervision plan design. And 4. specifically for the following market scopes: (1) protection against household electrical appliances that endanger human body. (2) Protection against electric tool electric leakage that endangers human body. And (3) earth leakage protection and protection against electric shock for electrical equipment in industrial and mining enterprises.

The invention relates to a power grid fault simulation test system movement detection device for a high-altitude photovoltaic power station. The movement detection device is of a vehicle-mounted container structure, is concentrated in three containers by adopting highly integrated design, the three containers are respectively a switch cabinet, a 35 kV electric reactor vehicle and a 10 kV electric reactor vehicle, each container is of a standard size, the transportation limitation requirements are met, and in addition, a centralized control vehicle carries a control system for totally controlling the whole device. The device can perform low voltage ride-through detection capability detection on the photovoltaic power station, can assist users in performing a wind power low voltage ride-through test, can finish switching of a wind power control system and a photovoltaic control system which are different, and is wide in coverage and high in adaptability.

The invention discloses a fault protection device of a high-energy power supply system and a protection method thereof. The fault protection device is characterized in that high-voltage ends of two groups of energy storage capacitor banks are respectively connected with a current-limiting element group in series and then connected with a controllable switch and an energy absorption resistor in parallel to be connected to a load; and low-voltage ends of the two groups of energy storage capacitor banks are respectively connected with one current detecting unit in series. By adopting the structure and the method, the fault protection device and the protection method thereof have the advantages of capabilities of reducing the size and the production cost of a high-energy power supply system by replacing a high-grade current limiting element with a small-size low-grade current limiting element, rapid and reliable protection function, wide applicability and favorable economy, simple structure and suitability for large-scale production and reformation.

The present invention relates to a motion control system intermediate position detecting protecting device which is provided with an intermediate position detecting switch, a protecting function auxiliary relay and an intermediate position protecting switch, wherein the intermediate position detecting switch and the protecting function auxiliary relay are connected with a controller. The normally closed contact of the intermediate position protecting switch and the normally open contact of the protecting function auxiliary relay are connected in parallel. The normally open contract of the protecting function auxiliary relay is connected in series in the control circuit of the starting relay of the electric motor. The normally open contract of the intermediate position detecting switch is arranged in the control circuit of the protecting function auxiliary relay. The invention uses a simple hardware circuit to establish the system. The resource wastage of the controller is avoided and the moving component breakage risk caused by the confusion of software control is reduced. The position of the fault is expressed openly and the maintenance is facilitated. The invention also has the advantages of reliable protecting function, low cost and broad application sphere.

This invention relates to an eye protection device and a method for a large power signal transmission system, in which, an optical power detector PD sends the monitored signal state of input light to a BCT to control an optical control unit OCU to regulate the output optical signals to a related data state and communicate with a host device management computer, which does not use any additional optical wave channels to monitor the broken and resuming of optical transmission lines and enter into and retreat from the eye protection state.

The invention discloses a module safety control protection and indication circuit based on IGBT driving. The module safety control protection and indication circuit comprises a drive signal test module, a drive signal input interface module, a fault signal conversion module, a drive power supply module, a first IGBT drive module, a second IGBT drive module, a first IGBT over-current self-hold andindication module, a second IGBT over-current self-hold and indication module and an external interface module. According to the module safety control protection and indication circuit, when the IGBTdriver is switched on, VCE (when the IGBT is switched on, collector and emitter voltages) protection values are stable, the module safety control protection and indication circuit is high in anti-interference performance in the operation process, double-channel IGBT driving is adopted, a fault point can be self-locked in the protection process, the protection condition of any IGBT is clearly indicated, the input signal testing module is arranged, and testing of input driving signals is facilitated.

The invention provides a protection device for hemodynamic monitoring, and belongs to the technical field of hemodynamic monitoring. The protection device comprises a long-strip-shaped guide supporting plate and a positioning supporting plate; the positioning supporting plate and the guide supporting plate are connected through a guide mechanism capable of enabling the positioning supporting plateto longitudinally move along the upper surface of the guide supporting plate; the positioning supporting plate is connected with a traction piece; and the positioning supporting plate is provided with a positioning mechanism which can position a to-be-measured object on the positioning supporting plate and can release the to-be-measured object positioned on the positioning supporting plate. According to the protection device for hemodynamic monitoring, two clamping jaws are driven by a transmission assembly and a linkage assembly to position an object to be monitored and the positioning supporting plate, positioning is reliable, and a reliable protection function is achieved. According to the protection device for hemodynamic monitoring, clamping and loosening of a clamping piece are achieved through collision of a transmission piece and a fixing column, a stroke limiting convex body is embedded into the positioning groove to form self-locking of the clamping piece, and clamping operation is convenient.

A roadway gangue filling machine for tunneling filling roadway mining method, which consists of a projecting belt part (1), a rotary table (3), a material feeding and conveying part (5), an underframe assembly (4), and a crawler walking part ( 2), composed of hydraulic system and electric control system. The frame of the projecting belt part has a hydraulically controlled telescopic mechanism and a gangue leveling device; the feeding and conveying part is composed of a leveling mechanism, a deflection adjustment mechanism and an inclination adjustment mechanism; the crawler walking part is driven by a hydraulic motor; the hydraulic system has an on-board hydraulic pump station . The function of free expansion and retraction of the ejection belt and flattening of gangue improves the filling efficiency and quality; the function of leveling, deviation adjustment and inclination adjustment of the feeding and conveying part prevents the belt from deviation and is easy to adjust; the hydraulic travel part has large traction, flexibility and grounding The specific pressure is small; the onboard hydraulic pump station completes the hydraulic system, which integrates electromechanical and hydraulic functions such as casting, feeding, walking, and operation, and the operation is safe, convenient and flexible; the onboard PLC electronic control system has multiple functions and complete protection. It is suitable for "three-down" coal mining in mines containing explosive gas and coal dust.

A motor starter system and a method for operating same are disclosed. According to an embodiment of the present invention, reliability of a motor protection function during an overcurrent is improved by automatically controlling the on/off state of an electromagnetic contactor using an analog sensor value outputted from an external sensor. In addition, the present invention can receive an external sensor value through a connected upper monitoring device, monitor, in real time, the motor starter state, and transmit a control command for directly controlling the on/off state of the electromagnetic contactor, and thus enables excellent operation, integrated lifetime prediction, and motor load management. Furthermore, the present invention can reduce wiring work and a cost thereof and maximizing the use of space more than when controlling the electromagnetic contactor by using the I/O of a PLC.

The invention discloses an anti-disassembly protection cabinet for an outdoor transformer. The anti-disassembly protection cabinet comprises a cabinet body, a cabinet door, a first fixing body, a second fixing body and an anti-disassembly mechanism, according to the transformer protection cabinet designed by the invention, by means of the first fixing body and the second fixing body, the transformer protection cabinet can be well locked, so that the protection function of the protection cabinet is more stable and reliable, and the anti-disassembly mechanism has a good anti-disassembly protection function for the cabinet body, then mistaken disassembly of the protection cabinet is avoided, therefore, the transformer can be effectively protected continuously and stably, normal and stable operation of the transformer is guaranteed, the safety of the surrounding environment of the transformer is guaranteed, and safety accidents are avoided.

The invention relates to a transformer substation monitoring method. According to the method, a compound eye combined probe consisting of a plurality of micro infrared probes, micro ultraviolet probesand micro high-definition probes is arranged on a monitoring vertical rod in a transformer substation; each power high-voltage device in the transformer substation is monitored; the micro infrared probe is used for detecting an overheat fault in operation of the the power high-voltage device; the discharge fault of the power high-voltage device is detected through the micro ultraviolet probe; whether opening and closing of the isolation switch are in correct positions is detected through the micro high-definition probe; whether a worker crosses a red line or not and whether danger is close tothe high-voltage device or not is judged; all probes in the compound eye combined probe are electrically connected with the control module through the corresponding data transmission modules respectively; and the protection execution device is controlled to work through the control module so as to carry out corresponding fault protection. The method is beneficial to effective monitoring and faultprotection of the power high-voltage equipment in the transformer substation.

The invention discloses a special frequency converter for an electric discharge machining linear cutting machine, wherein the main body of the electric discharge machining linear cutting machine is a 750/1500W three-phase motor driven by 220V alternating current in a variable frequency driving mode, and belongs to the field of electrical industry. The frequency converter used for the electric discharge machining linear cutting machine is composed of three independent portions which are a power supply module, a controlling module, a frequency conversion module, and all the modules are distributed in a 300*200*80 mm small case. The controlling module is connected with an external input signal through a connector DB15 and a socket DB25, and a frequency conversion output is connected with a transport wire, a water pump motor and an illuminating lamp through an aeration socket with twelve cores. The frequency converter used for the electric discharge machining linear cutting machine is simple in structure, convenient to maintain, and simple to install.