摘要:
This application provides a charging protection method, a terminal, and a charger. The terminal obtains a parameter from the charger, including at least one of an input voltage value and an output current value of the charger and a temperature value of a charging output port of the charger. When a parameter value is greater than a threshold, the terminal terminates a charging process based on a relationship between a corresponding threshold and at least one of a difference between the output current value of the charger and an input current value of the terminal, a power loss from the charger to the terminal, and a temperature value (including the temperature value of the charging output port of the charger and a temperature value of a charging input port of the terminal). A charging port can be prevented from being overheated, and a probability that an overheated charging port causes an accident can be effectively decreased.
摘要:
A monitoring system (10) is described, to monitor the condition of an industrial wiring system (1) provided with a multipolar electric cable (2) with a number of electric conductors (21, 22) having a power and/or data transmission function and enclosed inside a protective sheath (28), wherein: monitoring conductors (27a, 27b), to monitor wear of the electric cable (2), are arranged inside the protective sheath (28) electrically insulated from the electric conductors (21, 22); and a monitoring device (32) is operatively coupled to the monitoring conductors (27a, 27b) so as to detect at least one electric parameter associated with the monitoring conductors to detect the wear of the electric cable (2) and generate corresponding monitoring data. The monitoring device (32) obtains its own power supply from, and/or transmits the monitoring data by means of, the electric conductors (21, 22) of the same electric cable (2).
摘要:
A system and method for protecting a power system (102, 200). A generator (106, 202) is tripped in response to identifying a current on the generator (106, 202) that is greater than a first current threshold for a first time delay. The generator (106, 202) is also tripped in response to identifying the current on the generator (106, 202) that is greater than a second current threshold for a second time delay. The first current threshold is larger than the second current threshold and the first time delay is shorter than the second time delay.
摘要:
There is provided a method of operating a reconfigurable differential protection scheme for carrying out differential protection of an electrical power network (10), the electrical power network (10) comprising a plurality of terminals (12, 14, 16, 18), each of the plurality of terminals (12, 14, 16, 18) configured to be in communication with each other of the plurality of terminals (12, 14, 16, 18) within a communications network, the method comprising the steps of: controlling the differential protection scheme to deactivate the differential protection; selecting a terminal (14) to be configured out of or into the differential protection scheme; communicating reconfiguration information among the plurality of terminals (12, 14, 16, 18) via the communications network, the reconfiguration information including the selection of the terminal (14) to be configured out of or into the differential protection scheme, wherein the communications network is any one of: a daisy-chain communications network; a ring communications network; a meshed communications network; a star communications network; a bus communications network; a tree communications network; or a hybrid thereof; after communicating the reconfiguration information among the plurality of terminals (12, 14, 16, 18), modifying a respective differential protection algorithm at each of the non-selected terminals (12, 16, 18) so as to configure the selected terminal (14) out of or into the differential protection scheme; and controlling the differential protection scheme to reactivate the differential protection.
摘要:
Die Erfindung betrifft ein Differentialschutzsystem zum Überwachen einer Leitung (11) eines Energieversorgungsnetzes, bei dem an den Enden (11a, 11b) der Leitung (11) Stromzeigermesswerte erfasst und zu einer Auswerteeinrichtung übertragen werden, mittels der mit zeitlich einander zugeordneten Stromzeigermesswerten ein Differenzstromwert gebildet wird, wobei zur zeitlichen Zuordnung der an unterschiedlichen Enden (11a, 11b) erfassten Stromzeigermesswerte eine den Zeitversatz zwischen lokalen Zeitgebern (CLK) der Messeinrichtungen angebende Zeitversatzinformation herangezogen wird, und ein einen Fehler hinsichtlich der Leitung (11) angebendes Fehlersignal erzeugt wird, wenn der Differenzstromwert einen vorgegebenen Schwellenwert überschreitet.
摘要:
A system and method for protecting a power system (102, 200). A generator (106, 202) is tripped in response to identifying a current on the generator (106, 202) that is greater than a first current threshold for a first time delay. The generator (106, 202) is also tripped in response to identifying the current on the generator (106, 202) that is greater than a second current threshold for a second time delay. The first current threshold is larger than the second current threshold and the first time delay is shorter than the second time delay.
摘要:
A current differential protection system for a multi-terminal power line includes a current sensor for sensing a current at a local terminal, a controller (80) for time synchronizing the local terminal and remote terminals, and a fault detection module (98) to detect a fault in the multi-terminal power line if a differential current exceeds a threshold value. The controller (80) includes a time measurement exchange module (94) for exchanging time stamp data with remote terminals, an upper range clock for exchanging time stamp data with remote terminals and a lower range clock for indexing the current at the local terminal. A first time period of the upper range clock is N times a second time period of the lower range clock where N is a number of multi-terminals. The controller (80) includes a clock offset calculation module for determining an average time offset based on time stamp data from remote terminals and the local terminal.
摘要:
A circuit protection system (100) includes a first current sensing device (102) operative to measure a current of a first phase of a voltage source (151), a second current sensing device (102) operative to measure a current of a second phase of a voltage source (153), and a logic portion (110) communicatively connected to the first current sensing device (102) and the second current sensing device (102), the logic portion (110) operative to receive measured currents from the first current sensing device (102) and the second current sensing device (102), determine whether the measured current of the first phase (151) is less than a threshold current value during a time period, and output an indication that a short exists in the first phase of the voltage source (151) responsive to determining that the measured current of the first phase (151) is not less than the threshold current value during the time period.