Digital circuit-based nuclear phase discrimination device and control method
A digital circuit and discrimination device technology, applied in the field of electric power system, can solve problems such as unfavorable batch production, high voltage generation, affecting equipment and operator safety, etc., and achieve the effect of reducing secondary wiring
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Embodiment 1
[0057] like figure 1As shown, this embodiment discloses a nuclear phase discrimination device based on a digital circuit, including a capacitor voltage divider circuit 10, a digital circuit 20, a central control module 30, a power supply module 40, and a display module 50; the input of the capacitor voltage divider circuit 10 It is connected with the bus side three-phase voltage output and the line side three-phase voltage output, and the output end of the capacitor voltage divider circuit 10 is respectively connected with the input end of the digital circuit 20; the output end of the digital circuit 20 is connected with the input end of the central control module 30, The output end of the central control module 30 is connected to the display module 50 through the RS232 communication circuit; the power supply module 40 is connected to the central control module 30 and the display module 50 respectively. Among them, the three-phase voltage on the bus side and the three-phase vo...
Embodiment 2
[0081] A nuclear phase discrimination device based on a digital circuit disclosed in this embodiment, on the basis of the content disclosed in the first embodiment above, also includes a grounding knife circuit 1 and a locking circuit 2, and the grounding knife circuit 1 and the central The output end of the control circuit 30 is connected, and the output end of the blocking ground knife circuit 1 is connected with the blocking circuit 2 .
[0082] Further, as figure 2 As shown, in the three-phase voltage divider circuit 21 on the bus side of the capacitor divider circuit 20, each voltage divider circuit in the three-phase voltage divider circuit on the bus side of the capacitor divider circuit 20 also includes a capacitor connected in parallel with the divider capacitor C2 Blocking relay BSJ1-BSJ3, when any phase of the busbar is charged, the blocking relay is activated by the voltage sensed by C2, and the normally closed node on the blocking relay is opened, thereby disconn...
Embodiment 3
[0088] like Figure 20 As shown, this embodiment discloses a method for using a digital circuit-based nuclear phase discrimination device, including the following steps:
[0089] S1. The capacitive voltage divider circuit collects the three-phase voltage on the bus side and the three-phase voltage amplitude on the line side to obtain the analog voltage amount of the three-phase voltage on the bus side and the analog voltage amount on the three-phase voltage on the line side;
[0090] S2. The digital circuit converts the analog voltage quantities of the three-phase voltage at the busbar side and the analog voltage quantities of the three-phase voltage at the line side into six corresponding digital signals;
[0091] S3. The central control module processes the six corresponding digital signals, and judges whether any two voltages are in phase by comparing the zero-crossing time difference.
[0092] Further, as Figure 21 As shown, step S3 specifically includes the following s...
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