Capacitive cable-type voltage transducer for ring main unit

Abstract

The invention discloses a capacitive cable-type voltage transducer for a ring main unit. A high-voltage end copper bar is arranged at the upper end of a high-voltage-end aluminum sleeve,the high-voltage-end aluminum sleeve sleeves the outer surface of an epoxy glass fiber tube,a silicon rubber insulation sleeve is arranged below the high-voltage-end aluminum sleeve,and a semi-conductive silicon rubber sleeve is arranged on the outer surface of the silicon rubber insulation sleeve; a high-voltage-end polypropylene capacitor is arranged inside the epoxy glass fiber tube,an aluminum base is arranged at the bottom of the epoxy glass fiber tube,and a phase-zero-sequence error-adjustable coil and a low-voltage-end polypropylene capacitor are arranged inside the aluminum base; an epoxy mixture seals the epoxy glass fiber tube,the high-voltage-end polypropylene capacitor,the phase-zero-sequence error-adjustable coil and the low-voltage-end polypropylene capacitor as a whole for insulating treatment; a four-core shielded twisted pair cable is guided out from the left side of the aluminum base. The capacitive cable-type voltage transducer is simple in structure,low in weight and small in size,a special measuring cabinet does not need to be arranged,the cost is lowered,and the capacitive cable-type voltage transducer is simpler and more convenient to operate; the space is saved,the performance is improved,and functions of voltage sampling,measuring,protection,zero sequence,discharging and the like are integrated; the capacitive cable-type voltage transducer is convenient to detach andeasy to replace.

Description

technical field [0001] The invention relates to the field of distribution network automation sampling control, in particular to a capacitive cable-type voltage sensor for a ring network cabinet. Background technique [0002] With the rapid development of electronic technology, microcomputer relay protection devices gradually occupy a dominant position. In relay protection and measurement, the energy flow and information flow of the control part are separated, so the monitoring equipment no longer needs high-power output sensors. Sampling; at the same time, due to the rapid development of the power industry and the more complex grid conditions, smart current and voltage transformers that improve power factor and grid quality are widely used; because the space in the ring main unit is extremely small and it is a fully insulated structure, it is not conducive to Direct installation of traditional transformers requires special metering cabinets, which are costly and occupy a lar...

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Problems solved by technology

[0002] With the rapid development of electronic technology, microcomputer relay protection devices gradually occupy a dominant position. In relay protection and measurement, the energy flow and information flow of the control part are separated, so the monitoring equipment no longer needs high-power output sensors. Sampling; at the same time, due to the rapid development of the power industry and the more complex grid conditions, smart current and voltage transformers that improve power factor and grid quality are widely used; because the space in the ring main unit is extremely small and it is a fully insulated structure, it is not conducive to Direct installation of traditional transformers requires special metering cabinets, which are costly and occupy a large area; especially for those that have already been installed and need to add metering functions, metering cabinets need to be reinstalled, which increases the difficulty of operation and greatly increases the cost; the cost performance is relatively high Low; In addition, single-phase zero-sequence voltage transformers and single-phase voltage transformers with independent structures are often used in the prior art; traditional electronic PTs have large product weight and volume, and complex installation; existing PTs for distribution networks have faults Therefore, a capacitive cable-type voltage sensor for the ring network cabinet is developed, which can provide voltage acquisition signals for the power distribution terminal FTU / DTU, and has the functions of voltage sampling, measurement, protection, zero sequence, and discharge. An integrated three-phase intelligent voltage sensor is imminent

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