Three-phase undervoltage, phase loss delay relay
A time-delay relay and three-phase power supply technology, applied in relays, circuits, electrical components, etc., can solve problems such as chaotic wiring, energy consumption, and complicated components in the cabinet
Active Publication Date: 2016-06-15
国网江苏省电力有限公司常州市金坛区供电分公司 +3
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Problems solved by technology
[0004] When there are multiple voltage busbars in the panel cabinet, it is often necessary to install dozens of relays in one control cabinet, which not only consumes materials and energy, but also has complicated components in the cabinet, chaotic wiring, and difficulty in debugging and maintenance.
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[0018] See Figure 1-5 , the three-phase undervoltage and phase-lack time-delay relay of this embodiment includes: a voltage sampling circuit connected to the three-phase power supply, and a voltage sampling circuit connected to the voltage sampling circuit for comparing the sampling voltage with a preset reference voltage to distinguish the measured three-phase Whether the phase power supply is undervoltage or lack of phase, the operation comparator detection circuit, the undervoltage output circuit connected with the operation comparator detection circuit for outputting the instantaneous action signal of the remote use when the undervoltage fault is detected, and the undervoltage output circuit A timing controller connected to the output terminal of the timing trigger signal is used to output a delay action signal for remote use after the undervoltage time of the undervoltage fault reaches a set delay.
[0019] The undervoltage output circuit is connected with a three-phase ...
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The invention relates to a three-phase undervoltage and phase failure time-delay relay, which comprises a voltage sampling circuit, an operating comparator detection circuit, an undervoltage output circuit and a timing controller. The voltage sampling circuit is connected with a three-phase power supply; the operating comparator detection circuit is connected with the voltage sampling circuit and is used for comparing sampling voltage with the preset reference voltage so as to judge whether undervoltage or phase failure is present in the detected three-phase power supply; the undervoltage output circuit is connected with the operating comparator detection circuit and is used for outputting an instantaneous action signal for a remote signal when an undervoltage failure is detected; and the timing controller is connected with an output end of a timing trigger signal of the undervoltage output circuit and is used for outputting a time-delay action signal for the remote signal when the undervoltage time of the undervoltage failure reaches the set time delay. The relay can realize total functions of five combined relays in the prior art, saves shielding space in a control cabinet, simplifies installation and connection, reduces the consumption of materials and energy and reflects a green, environment-friendly and low-carbon economic development model.
Description
technical field [0001] The invention relates to the technical field of a three-phase AC voltage monitoring device for a substation or a power plant, in particular to a three-phase undervoltage and phase-lack delay relay. Background technique [0002] At present, many substations and power plants monitor the three-phase AC voltage at each node of the power grid. Together, it provides a strong guarantee for the safety of power production and the accuracy of power measurement. [0003] The currently used three-phase AC voltage detection circuit is usually composed of five relays: three low-voltage relays respectively detect the A, B, and C phase voltages, one time relay for delay, and one intermediate relay to output signal contacts. [0004] When there are multiple voltage busbars in the panel cabinet, it is often necessary to install dozens of relays in one control cabinet, which not only consumes materials and energy, but also has complicated components in the cabinet, chao...
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IPC IPC(8): H02H3/253
CPCH01H47/18
Inventor 陈俊夏冰
Owner 国网江苏省电力有限公司常州市金坛区供电分公司