Single-pole ground fault locating system for pseudo bipolar DC transmission and distribution line
A single-pole grounding fault, transmission and distribution line technology, applied in fault location, measuring current/voltage, detecting faults by conductor type, etc., can solve problems such as switch malfunction, refusal to operate, insulation damage, etc.
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[0095] This embodiment combines figure 2 Schematic diagram of a single-pole ground fault of a DC transmission and distribution line, Figure 4 Schematic diagram of the measurement system structure and Figure 5 The voltage measurement front-end block diagram briefly illustrates the implementation.
[0096] Assuming that the normal operation of the DC transmission and distribution line where the measurement system is located, the positive and negative pole-to-ground voltages are + / -10kV respectively, that is, the voltage difference between the poles is 0-20kV. Between 1 mA, and the low-voltage arm R of the pseudo-two-stage DC transmission and distribution line during normal operation and single-pole fault location N The absolute value range of the output voltage above is always 0 ~ 10V, then choose the high voltage arm resistance R H The resistance value is 200MΩ, the precision resistor R of the low voltage arm N-1 The resistance value is 2MΩ, the resistance R N The resis...
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