摘要:
An overvoltage protection device includes first and second electrically conductive electrode members (130, 120) and a varistor member (110) formed of a varistor material (172) and electrically connected with each of the first and second electrode members. The overvoltage protection device has an integral fail-safe mechanism operative to electrically short circuit the first and second electrode members about the varistor member by fusing the meltable member (140) in the overvoltage protection device (134) by using an electric arc. The overvoltage protection device further includes an electrically insulating spacer member (144) electrically isolating the fusing metal member (140) from the electrodes; the electric arc disintegrates the spacer member and extends across the gap (G1, G3 and G2) to fuse the meltable/fusing member (140).
摘要:
An overvoltage protection device includes first (120) and second (130) electrically conductive electrode members and a varistor member (110) formed of a varistor material and electrically connected with each of the first and second electrode members. The overvoltage protection device includes both: an integral first fail-safe mechanism (161) configured to electrically short circuit the first and second electrode members about the varistor member when triggered by a first set of operating conditions; and an integral second fail-safe mechanism (141) configured to electrically short circuit the first and second electrode members about the varistor member when triggered by a second set of operating conditions different from the first set of operating conditions.
摘要:
The invention relates to a cable breakout assembly, comprising: a breakout device (162) configured to receive a primary cable (160) and connect primary power lines in the primary cable with secondary power lines in multiple secondary cables (144A-144N); and a surge protection system (180) located within the breakout device configured to connect to the primary power lines in the primary cable and connect to the secondary power lines in the secondary cables, and further comprising multiple surge protection devices located within the breakout device each connected to a separate pair of the primary power lines in the primary cable and connected to a separate pair of the secondary power lines in one of the secondary cables.
摘要:
A telecommunications system uses a breakout device to connect a primary power cable to different secondary power cables that connect to different remote radio units (RRUs). For example, the breakout device may include a power distribution terminal that connects -48VDC and return power lines in the primary power cable to different -48VDC and return power lines in the secondary power cables. In another example, the breakout device may connect a hybrid cable that includes both power lines and fiber optic lines. A surge protection system may be located in the breakout device to protect the RRUs and other electrical device from power surges. Alternatively, the surge protection system may be located in jumper power cables connected between the breakout device and the RRUs.
摘要:
Devices include an impulse current generator that is configured to provide a direct impulse current (DIC) that includes a specified waveform to a test load during a test duration, a continuous power supply that is configured to provide a continuous power to the test load during the test duration, a trigger circuit that is configured to determine a trigger condition that corresponds to the DIC and to generate a trigger signal responsive to determining the trigger condition, and a current bypass circuit that is configured to receive the trigger signal generated by the trigger circuit and to conduct a majority portion of the DIC being conducted by the load responsive to the trigger signal.
摘要:
A telecommunications system uses a breakout device to connect a primary power cable to different secondary power cables that connect to different remote radio units (RRUs). For example, the breakout device may include a power distribution terminal that connects -48VDC and return power lines in the primary power cable to different -48VDC and return power lines in the secondary power cables. In another example, the breakout device may connect a hybrid cable that includes both power lines and fiber optic lines. A surge protection system may be located in the breakout device to protect the RRUs and other electrical device from power surges. Alternatively, the surge protection system may be located in jumper power cables connected between the breakout device and the RRUs.
摘要:
The invention belongs to the field of devices for measuring electric variables, transmission systems for measured values as well as protection of arrangements for distribution of electricity. The invention relates to a sensor for monitoring the state of a surge arrester to which it is attached and to a monitoring method. The sensor comprises: - a housing for housing all sensor components, wherein temperature and humidity sensors are located on a housing exterior; - power supply means for ensuring operational power; - a part for connection to a power line having devices for measuring a capacitive and a resistive leakage current as well as a creepage current and devices for counting the number of surges, - electronics for processing the measured parameters comprising: o a processor for processing measured parameters, preferably a microprocessor, o a connector to the temperature and humidity sensors, o a connection to the power supply means,
- and a communication module for sending measured data to a remote location.
摘要:
Devices include an impulse current generator that is configured to provide a direct impulse current (DIC) that includes a specified waveform to a test load during a test duration, a continuous power supply that is configured to provide a continuous power to the test load during the test duration, a trigger circuit that is configured to determine a trigger condition that corresponds to the DIC and to generate a trigger signal responsive to determining the trigger condition, and a current bypass circuit that is configured to receive the trigger signal generated by the trigger circuit and to conduct a majority portion of the DIC being conducted by the load responsive to the trigger signal.