摘要:
A circuit breaker system and method having zone selective interlock features is provided. The system and method include the transmission of a selective interlock signal from a downstream circuit breaker to an upstream circuit breaker in the event a first or second fault condition is detected. The upstream circuit breaker upon receipt of this signal changes the response of the second circuit breaker depending on whether the first or second fault condition has been detected.
摘要:
A circuit breaker system and method having zone selective interlock features is provided. The system and method include the transmission of a selective interlock signal from a downstream circuit breaker to an upstream circuit breaker in the event a first or second fault condition is detected. The upstream circuit breaker upon receipt of this signal changes the response of the second circuit breaker depending on whether the first or second fault condition has been detected.
摘要:
An electronic trip unit (100) for a circuit breaker, the electronic trip unit (100) includes a rating plug (110) having a plurality of switches (SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8) each configured to indicate a specified current rating for the rating plug (110) and for selectively supplying a current rating for the electronic trip unit (100), a processing unit (140) which receives and reads a value of the selected current rating from the rating plug (110) upon power-up, and a gain control unit (120) including a plurality of gain circuits (122). Each of the gain circuits (122) including a plurality of gain switches (124) set by the processing unit (140) based upon the selected current rating, to control a gain of input current of the electronic trip unit (100).
摘要:
A control system includes an enclosure (101), a control panel (100), and a plurality of controls, indicators, or both (103) mounted on the control panel or in the enclosure. At least some of the plurality of controls, indicators, or both are configured to wirelessly communicate with each other inside the enclosure, and at least some controls including wirelessly controlled relays are configured to control devices outside the enclosure. Also, the wirelessly configured controls, indicators, or both are further configured to communicate with a plurality of other controls, indicators, or both in the control system.
摘要:
A method for operating a controller includes receiving a first accumulated thermal value of an electrical machine (107) and an associated first time stamp from a memory (106), initializing a processor (104) of the controller (102) with the first accumulated thermal value and the associated first time stamp (310), determining whether a second time stamp has been received, calculating a difference between the second time stamp and the first time stamp responsive to determining that the second time stamp has been received (314), calculating a second accumulated thermal value as a function of the first accumulated thermal value, the first time stamp (318), and the second time stamp, and updating the first accumulated thermal value with the second accumulated thermal value (320).
摘要:
A rating plug for an electronic trip unit is disclosed. The rating plug has a housing with a plurality of switches disposed within the housing, each of the switches positionable in one of two positions. The settings of the switches establish a digital signature associated with the rating plug, providing for a universal rating plug that can be used on any circuit breaker that is accepting of the rating plug and that has a sensor value equal to or greater than the rating plug current rating. For instance, a rating plug having a 1000Amp rating can be used on any circuit breaker sensor for use at or above 1000A.
摘要:
A rating plug that, in addition to setting the percentage de-rating on the voltage conditioning (i.e., gain/filter) circuit, by controlling the operational amplifier gain with analog switches in series with the opamp feedback loop, provides breaker frame and/or sensor information to a microprocessor.
摘要:
A circuit breaker system and method having zone selective interlock features with separate restrained and unrestrained setting capability is provided. The system and method include the transmission of a selective interlock signal from a downstream circuit breaker to an upstream circuit breaker in the event of a fault condition. The upstream circuit breaker upon receipt of this signal changes the tripping response of the second circuit breaker to a restrained mode. The circuit breakers include features enabling the user to modify and adjust both the restrained and unrestrained trip curves associated with both the restrained and unrestrained modes of operation.