All-in-one sensing apparatus for transformer bushing tap monitoring

An all-in-one sensing apparatus for transformer bushing tap monitoring, comprising:

• a tap lead device connected to a grounding wire of a transformer bushing through a mounting bracket and configured to lead out the grounding wire, so as to detect a current and voltage signal of the grounding wire;
• a sensor assembly provided on the mounting bracket, connected to an oil taking port of the transformer bushing, and configured to detect a temperature, a pressure, a partial discharge current and a hydrogen content of the transformer bushing and upload the temperature, the pressure, the partial discharge current and the hydrogen content of the transformer bushing;
• and
• a power module provided on the mounting bracket, and configured to supply power to the sensor assembly through coil induction,
• wherein an output terminal of the tap lead device is connected to the power module, and an output terminal of the power module is connected to the sensor assembly;
• the sensor assembly comprises:
• a base, a mounting housing, and a cover body,
• wherein the mounting housing is provided on the base;
• the cover body covers the mounting housing;
• the base is connected to the transformer bushing through the mounting bracket with a flange plate;
• and a high-frequency head, a pressure sensor, a temperature sensor and a hydrogen sensor are provided in the base;
• a first circuit board and a second circuit board are provided in the mounting housing;
• an exhaust vent and an oil taking port are formed at a side of the base;
• an antenna is provided at a side of the mounting housing;
• and the antenna is connected to the second circuit board;
• a first wiring port and a second wiring port are further formed at the side of the mounting housing;
• the first wiring port is connected to the first circuit board, and the second wiring port is connected to the second circuit board;
• and
• the high-frequency head, the pressure sensor, the temperature sensor and the hydrogen sensor each comprise an output terminal connected to the second circuit board;
• and an output terminal of the first circuit board is connected to the high-frequency head, the pressure sensor, the temperature sensor and the hydrogen sensor;
• and
• the second circuit board comprises:
• a power conversion module, a signal acquisition module, a control module, and a wireless transmission module,
• wherein an output terminal of the power conversion module is connected to the signal acquisition module and the control module;
• an output terminal of the signal acquisition module is connected to the control module;
• and the control module is connected to the wireless transmission module;
• the signal acquisition module comprises a high frequency current transformer (HFCT) acquisition circuit, an ultra high frequency (UHF) acquisition circuit, a single hydrogen signal acquisition circuit, a dielectric loss signal acquisition circuit, and a pressure-temperature acquisition circuit;
• the HFCT acquisition circuit is configured to acquire an output signal of a coaxial radio-frequency (RF) cable in the transformer bushing, perform multistage amplification on an acquired output signal and transmit a processed signal to the control module;
• the UHF acquisition circuit is configured to acquire the output signal of the coaxial RF cable in the transformer bushing, input the acquired output signal to an inductor-capacitor (LC) filter circuit and an amplifier circuit to obtain a UHF acquisition signal and transmit the UHF acquisition signal to the control module;
• the single hydrogen signal acquisition circuit is configured to amplify a signal detected by the hydrogen sensor, and output an amplified signal to the control module;
• the dielectric loss signal acquisition circuit is configured to compare a signal obtained by signal acquisition of the dielectric loss sensor from a lead-out grounding wire with a preset reference voltage to obtain a dielectric loss signal, and transmit the dielectric loss signal to the control module;
• and
• the pressure-temperature acquisition circuit is configured to transmit a temperature signal and a pressure signal of the transformer bushing respectively detected by the temperature sensor and the pressure sensor to the control module.