CN203406160U - Combined instrument transformer provided with closed magnetic circuit type hollow coil - Google Patents

Abstract

A combined instrument transformer provided with a closed magnetic circuit type hollow coil comprises a primary wire, a secondary coil, a high-voltage shielding cover, a high-voltage resistor, a low-voltage shielding cover, an aerial socket, a high-precision current transformer, an earthing bolt, a metal base box and an insulating shell. The combined instrument transformer provided with the closed magnetic circuit type hollow coil is characterized in that the secondary coil is the hollow coil with a closed magnetic circuit type. According to the combined instrument transformer provided with the closed magnetic circuit type hollow coil, due to the fact that an annular core provided with air gaps is embedded among printed coil boards, the magnetic flux passing through the printed coil boards is increased obviously, signal intensity is high, and magnetic saturation hardly exists; bandwidth is large, the dynamic measurement range is wide, the signal to noise ratio is high, stability is good, interference resistance is good, one coil can be used for measurement as well as protection, the size is small, the weight is low, and practicality is high; the high-precision current transformer is used for measuring the weak current flowing through the high-voltage resistor to an earthing end, total separation between a primary system and a secondary system is realized, electromagnetic resonance of a power grid is avoided, the combined instrument transformer can be connected with a digital instrument and a microcomputer protection device easily, and using is safer.

Description

A kind of combination transformer with closed magnetic circuit air core coil

Technical field

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

Background technology

At present, in the combination transformer using at 6～35KV 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 resistance or capacitance-voltage-distributing type structure, there is the advantage such as measure bandwidth, dynamic property is good, the range of linearity is large, insulation system is simple, volume is little, but also there is restricted application, the isolation completely, the electrical secondary system that do not realize primary system and electrical secondary system be subject to the weak points such as primary system interference.

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, and signal to noise ratio is high, good stability, antijamming capability is strong, bandwidth, and range of dynamic measurement is large, applied widely, there is not the combination transformer with closed magnetic circuit air core coil of magnetic saturation problem.

The purpose of this utility model is achieved in that a kind of combination transformer with closed magnetic circuit air core coil, comprise wire one time, secondary coil, high-tension shielding cover, high-tension resistive, low pressure radome, aviation socket, high precision current transformer, earth stud, metab box, 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, making significantly increases by the magnetic flux of track girth sheets, 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.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.High precision current transformer measurement is flow through high-tension resistive to the weak current of earth terminal, and its secondary current is sent to control room by wire, then converts corresponding secondary voltage signal to for instrument and protection interface through current-voltage.Insulation system is simple, and certainty of measurement is high, uses safety, practical, applied widely.

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 combination transformer with closed magnetic circuit air core coil, comprise wire 1 one time, secondary coil 2, insulation shell 3, fairlead 4, high-tension shielding cover 5, high-tension resistive 6, low pressure radome 7, metab box 8, aviation socket 9, high precision current transformer 10, discharge tube 11, discharge tube support 12, earth stud 13, transducer bracket 14, one time wire 1 passes from secondary coil 2 centers, fairlead 4 is vertically placed in secondary coil 2 belows, while is as the mounting bracket of secondary coil 2, the lead-in wire of secondary coil 2 is connected with aviation socket 9 by fairlead 4, high-tension resistive 6 upper ends connect high-tension shielding cover 5, and connect with a wire 1 by lead-in wire, high-tension resistive 6 lower ends connect low pressure radome 7 and connect with earth stud 13 through high precision current transformer 10 centers by lead-in wire, in parallel with discharge tube 13 two ends by lead-in wire in the time of high-tension resistive 8, high precision current transformer 11 connects with aviation socket 9 by wire, by epoxy resin, each is zero, parts pour into an integrated entity, form insulation shell 3, metab box 8 is arranged on insulation shell 3 belows, high precision current transformer 10, discharge tube 11 is arranged in metab box 8 by transducer bracket 14 and discharge tube support 12 respectively, aviation socket 9 is arranged on metab box 8 one sides, secondary coil 2 is by track girth sheets 15, printing connecting line plate 16, periphery decile cuts out the annular core 18 of four road air gaps 17, screening can 19 forms, annular core 18 is placed on printing connecting line plate 16, in per pass air gap 17, vertically place respectively a slice track girth sheets 15, by being fixedly connected with in corresponding installing hole on the projection insertion printing connecting line plate 16 of track girth sheets 15 bottoms, in the one side of track girth sheets 15, multiturn coil is set, another side is laid output connecting line, coil connecting line is set above printing connecting line plate 16, on bottom surface, lay output connecting line, by the printing connecting line on printing connecting line plate 16, the printed coil on each track girth sheets 15 is connected, and draw terminals, the coated aluminium alloy screening can 19 in neighboring.

Claims (1)

1. the combination transformer with closed magnetic circuit air core coil, comprise a wire (1), secondary coil (2), high-tension shielding cover (5), high-tension resistive (6), low pressure radome (7), aviation socket (9), high precision current transformer (10), earth stud (13), metab box (8), insulation shell (3), it is characterized in that secondary coil (2) is by track girth sheets (15), printing connecting line plate (16), periphery decile cuts out the annular core (18) of air gap (17), the band closed magnetic circuit air core coil that screening can (19) forms, wherein annular core (18) is placed on printing connecting line plate (16), in per pass air gap (17), vertically place respectively a slice track girth sheets (15), track girth sheets (15) bottom is connected with printing connecting line plate (16), by the printing connecting line on printing connecting line plate (16), the printed coil on each track girth sheets (15) is connected, and draw terminals, the coated screening can in neighboring (19).

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