CN203406161U

CN203406161U - Hollow coil with closed magnetic circuit and resistance voltage divider combined electronic instrument transformer

Info

Publication number: CN203406161U
Application number: CN201320485899.1U
Authority: CN
Inventors: 唐晃; 曹希余; 杨福林; 欧会建
Original assignee: HENGYANG YIHU ELECTRICAL INSTRUMENT CO Ltd
Current assignee: HENGYANG YIHU ELECTRICAL INSTRUMENT CO Ltd
Priority date: 2013-08-09
Filing date: 2013-08-09
Publication date: 2014-01-22
Anticipated expiration: 2023-08-09

Abstract

A hollow coil with closed magnetic circuit and resistance voltage divider combined electronic instrument transformer comprises a primary lead wire, a secondary coil, an aerial socket, a grounding bolt, a high-voltage shielding case, a high-voltage arm resistor, a low-voltage shielding case, a low-voltage arm resistor and an insulating casing and is characterized in that the secondary coil is a hollow coil with a closed magnetic circuit, and the hollow coil consists of printed coil boards, printing connecting boards, annular iron cores provided with air gaps equally cut in the peripheries and a shielding casing. The annular iron cores provided with the air gaps are embedded among the printed coil boards, passing magnetic flux is remarkably increased, signal intensity is large, the magnetic saturation problem exists scarcely, frequency bandwidth is large, a dynamic measurement range is wide, the signal to noise ratio is high, the stability is high, the anti-jamming capability is high, measurement and protection functions are simultaneously achieved only through one coil, and the electronic instrument transformer is small in size, light in weight and high in practicability. The instrument transformer performs voltage measurement by adopting a precise resistance voltage divider and is high in measurement accuracy.

Description

Electronic mutual inductor with closed magnetic circuit air core coil and resitstance voltage divider combination

Technical field

The utility model relates to a kind of electric power mutual-inductor, particularly a kind of electronic mutual inductor with closed magnetic circuit air core coil and resitstance voltage divider combination.

Background technology

At present, in the combination transformer using at 10～35KV electrical network, the measure portion of electronic current mutual inductor wherein, protection part is generally to adopt respectively low power current transformer, two coils of air core coil, if measure portion and protection part are adopted to a low power current transformer, owing to there being magnetic saturation problem, just need to increase core section long-pending, volume is large, cost is high, the secondary winding of air core coil is wherein on non magnetic skeleton, without ferroic material, there is measurement bandwidth, range of dynamic measurement is large, and there is not magnetic saturation problem, but very high to coiling technological requirement, temperature influence and electromagnetic interference are larger, output signal is little, signal to noise ratio is low.Common electronic type voltage transformer is generally resistance or capacitance-voltage-distributing type structure, in electric resistance partial pressure type structure, adopt precision resistance voltage divider as sensing element, simple in structure, accuracy of measurement is high, volume is little, lightweight, and capacitance in capacitance-voltage-distributing type structure is easily subject to the impact of ambient temperature and changes, thereby reduce, measures precision.

Summary of the invention

The purpose of this utility model is in order to overcome above-mentioned weak point, and provide a kind of simple in structure, volume is little, lightweight, signal to noise ratio is high, good stability, antijamming capability is strong, bandwidth, range of dynamic measurement is large, does not have the electronic mutual inductor with closed magnetic circuit air core coil and resitstance voltage divider combination of magnetic saturation problem.

The purpose of this utility model is achieved in that a kind of electronic mutual inductor with closed magnetic circuit air core coil and resitstance voltage divider combination, comprise wire one time, secondary coil, aviation socket, earth stud, high-tension shielding cover, high-voltage arm resistance, low pressure radome, low-voltage arm resistance, insulation shell, it is characterized in that secondary coil is by track girth sheets, printing connecting line plate, periphery decile cuts out the annular core of air gap, the band closed magnetic circuit air core coil that screening can forms, wherein annular core is placed on printing connecting line plate, in per pass air gap, vertically place respectively a slice track girth sheets, track girth sheets bottom is connected with printing connecting line plate, by the printing connecting line on printing connecting line plate, the printed coil on each track girth sheets is connected, and draw terminals, the coated screening can in neighboring.

The utility model is owing to adopting above architecture advances, secondary coil in current transformer is the air core coil with closed magnetic circuit, between track girth sheets, embed annular core, cause the magnetic flux by track girth sheets significantly to increase, thereby increased the signal strength signal intensity of air core coil, can effectively suppress extraneous leakage field and disturb, owing to there being air gap in iron core, have hardly magnetic saturation problem simultaneously.Both air core coil bandwidth, advantage that range of dynamic measurement is large had been kept; the feature such as simultaneously also have that low power current transformer signal to noise ratio is high, good stability, antijamming capability are strong, has realized the function of only measuring simultaneously and protecting with a coil, and volume is little; lightweight, practical.Voltage transformer adopts precision resistance voltage divider measuring voltage, and accuracy of measurement is high.

Accompanying drawing explanation

Fig. 1 is the utility model example structure schematic diagram;

Fig. 2 is secondary coil structural representation;

Fig. 3 is printed coil plate structure schematic diagram;

Fig. 4 is printing connecting line plate structure schematic diagram;

Fig. 5 is secondary coil radial cross-section;

Fig. 6 is secondary coil side sectional view.

Embodiment

Now illustrated embodiment is made detailed description to the utility model by reference to the accompanying drawings.

As shown in the figure, a kind of electronic mutual inductor with closed magnetic circuit air core coil and resitstance voltage divider combination, comprise wire 1 one time, secondary coil 2, insulation shell 3, fairlead 4, discharge tube 5, aviation socket 6, earth stud 7, high-tension shielding cover 8, high-voltage arm resistance 9, low pressure radome 10, low-voltage arm resistance 11, wherein a wire 1 passes from the center of secondary coil 2, the secondary wiring of secondary coil 2 is connected with aviation socket 6 through fairlead 4 by going between, high-voltage arm resistance 9 one end connect high-tension shielding cover 8, high-tension shielding cover 8 is connected with a wire 1, high-voltage arm resistance 9 other ends are connected with low-voltage arm resistance 11 one end, low-voltage arm resistance 11 other ends are connected with low pressure radome 10, low pressure radome 10 is connected with earth stud 7, low-voltage arm resistance 11 two ends are connected with aviation socket 6 with after discharge tube 5 parallel connections again, by epoxy resin, each is zero, parts pour into an integrated entity, form insulation shell 3, aviation socket 6 is arranged on insulation shell 3 one sides.Secondary coil 2 is by track girth sheets 12, printing connecting line plate 13, periphery decile cuts out the annular core 16 of four road air gaps 15, screening can 14 forms, annular core 16 is placed on printing connecting line plate 13, in per pass air gap 15, vertically place respectively a slice track girth sheets 12, by being fixedly connected with in corresponding installing hole on the projection insertion printing connecting line plate 13 of track girth sheets 12 bottoms, in the one side of track girth sheets 12, multiturn coil is set, another side is laid output connecting line, coil connecting line is set above printing connecting line plate 13, on bottom surface, lay output connecting line, by the printing connecting line on printing connecting line plate 13, the printed coil on each track girth sheets 12 is connected, and draw terminals, the coated aluminium alloy screening can 14 in neighboring.

Claims

1. the electronic mutual inductor with the combination of closed magnetic circuit air core coil and resitstance voltage divider, comprise a wire (1), secondary coil (2), aviation socket (6), earth stud (7), high-tension shielding cover (8), high-voltage arm resistance (9), low pressure radome (10), low-voltage arm resistance (11), insulation shell (3), it is characterized in that secondary coil (2) is by track girth sheets (12), printing connecting line plate (13), periphery decile cuts out the annular core (16) of air gap (15), the band closed magnetic circuit air core coil that screening can (14) forms, wherein annular core (16) is placed on printing connecting line plate (13), in per pass air gap (15), vertically place respectively a slice track girth sheets (12), track girth sheets (12) bottom is connected with printing connecting line plate (13), by the printing connecting line on printing connecting line plate (13), the printed coil on each track girth sheets (12) is connected, and draw terminals, the coated screening can in neighboring (14).