CN201549360U

CN201549360U - Electronic high-voltage AC transformer

Info

Publication number: CN201549360U
Application number: CN2009202448869U
Authority: CN
Inventors: 杨雯; 王天祥; 赵华锋; 曾林翠
Original assignee: China XD Electric Co Ltd
Current assignee: China XD Electric Co Ltd
Priority date: 2009-10-23
Filing date: 2009-10-23
Publication date: 2010-08-11
Anticipated expiration: 2019-10-23

Abstract

The utility model relates to the field of high-voltage alternating current (AC) measurement, and discloses an electronic high-voltage AC transformer which is used between filter capacitor banks of a direct current (DC) power transformer system. The electronic high-voltage AC transformer includes a primary conducting rod, a base, a support insulator mounted on the base, a high-voltage housing fixed on the support insulator, a low-power coil mounted in the high-voltage housing, and a collector connected with an output terminal of the low-power coil; the primary conducting rod penetrates the geometric center of the high-voltage housing and the low-power coil mounted in the high-voltage housing; the collector outputs measuring signals; and the electronic high-voltage AC transformer is characterized in that a non-inductive resistor is connected between output terminals of the low-power coil.

Description

A kind of electronic type High Level AC Voltage current transformer

Technical field

The utility model relates to the high-voltage ac current fields of measurement, relates in particular to a kind of electronic type High Level AC Voltage current transformer, is used for the filtering capacitor group measurements unsymmetrical current of direct current electric transmission and transformation system.

Background technology

In the direct current electric transmission and transformation system, filtering capacitor is under operate as normal, and the rated current between its capacitor group is very little, has only several amperes; When line fault takes place, the fault current between the capacitor group will reach amperes up to ten thousand.At this moment, adopt electromagnetic current transducer or traditional electronic current mutual inductor to measure little current signal, its accurate precision is lower, can not satisfy measuring requirement.The high accuracy shunt can be measured little current signal more accurately, but because shunt need be serially connected in the primary system, can't bear the failed shorted electric current.Therefore, in the direct current electric transmission and transformation system, Current Transformer requires to satisfy the accurate measurement to little current signal between the filtering capacitor group, guarantees that again short-circuit current does not damage current transformer.

Summary of the invention

The purpose of this utility model is to provide a kind of electronic type High Level AC Voltage current transformer, be used between the filtering capacitor group of direct current electric transmission and transformation system, can satisfy accurate measurement, can guarantee that again short-circuit current can not damage current transformer little current signal.

In order to achieve the above object, the utility model is achieved by the following technical solutions.

A kind of electronic type High Level AC Voltage current transformer, be used between the filtering capacitor group of direct current electric transmission and transformation system, comprise the primary conductive bar, base, be installed in supporting insulator on the base, be fixed on the high pressure body on the supporting insulator, be installed in the low-power coil in the high pressure body, the collector that is connected with low-power coil output; Described primary conductive bar runs through the high pressure body and is installed in the geometric center of the low-power coil in the high pressure body; Described collector output measuring-signal; It is characterized in that, be connected with noninductive resistance between the described low-power coil output.

Further improvement of the utility model is: described low-power coil comprises annular insulation protection box, is placed on the interior ring shielding box of annular insulation protection box, is placed on the interior annular core of ring shielding box, is wound on the outer secondary winding of ring shielding box; The inner ring of described ring shielding box is provided with annular opening.

Electronic type High Level AC Voltage current transformer of the present utility model, between low-power coil output, be connected with noninductive resistance, can obtain measuring-signal accurately at the primary conductive bar by little electric current, when the short-circuit current that passes through, the induced current of restriction low-power coil.Therefore, the utility model is used for can satisfying the accurate measurement to little current signal between the filtering capacitor group of direct current electric transmission and transformation system, can guarantee that again short-circuit current can not damage current transformer.In addition, the inner ring of the ring shielding box of annular core of the present utility model is provided with annular opening, can prevent that simultaneously the ring shielding box-like from becoming short-circuited conducting sleeve to enlarge the error of current transformer when reaching the shielding purpose.

Description of drawings

Be described in further detail of the present utility model below in conjunction with the drawings and specific embodiments.

Fig. 1 is the connection diagram of filtering capacitor group in the direct current electric transmission and transformation system;

The structural representation of Fig. 2 a kind of electronic type High Level AC Voltage current transformer of the present utility model;

Fig. 3 is the measuring principle schematic diagram of Fig. 2;

Fig. 4 is the structural representation of low-power coil among Fig. 2;

Among the figure: 1 is the high pressure body; 2 is collector; 3 is the low-power coil; 4 is Primary Conductor; 5 is supporting insulator; 6 is base; 7 is annular insulation protection box; 8 is secondary winding; 9 is the ring shielding box; 10 is iron core; 11 is annular opening.

Embodiment

With reference to Fig. 1, in the direct current electric transmission and transformation system, the filtering capacitor group comprises C1, C2 series connection group and C3, C4 series connection group, and two series connection groups are connected in parallel between the direct current both positive and negative polarity.Electronic type High Level AC Voltage current transformer A of the present utility model is connected between the common node of the common node of C1, C2 and C3, C4.When filtering capacitor group operate as normal, the measurement electric current of electronic type High Level AC Voltage current transformer A is little; When short trouble, the measurement electric current of electronic type High Level AC Voltage current transformer A can reach amperes up to ten thousand.

With reference to Fig. 2, Fig. 3, a kind of electronic type High Level AC Voltage current transformer of the present utility model, be used between the filtering capacitor group of direct current electric transmission and transformation system, comprise primary conductive bar 4, base 6 is installed in supporting insulator 5 on the base 6, is fixed on the high pressure body 1 on the supporting insulator 5, be installed in the low-power coil 3 of the high pressure body interior 1, and the collector 2 that is connected with low-power coil 3 outputs; Primary conductive bar 4 runs through the high pressure body 1 and is installed in the geometric center of the low-power coil in the high pressure body; Be connected with noninductive resistance R between low-power coil 3 outputs; Collector 2 is installed in the high pressure body 1, mainly finishes signals collecting, filtering, amplification and the electric light translation function of low-power coil 3, the light signal information that output is measured.

Referring to Fig. 4, the low-power coil comprises annular insulation protection box 7, is placed on the ring shielding box 9 in the annular insulation protection box 7, is placed on annular core 10 in the ring shielding box 9, is wound on the outer secondary winding 8 of ring shielding box 9; The inner ring of ring shielding box is provided with annular opening 11.Secondary coil 9 adopts Φ 0.5mm ², the number of turn 2000 circles, ring shielding box 9 play the function of opposing external force and electric field shielding, and its material is the thick aluminium sheet of 4mm, and its inner ring is provided with annular opening 11, prevents that short-circuited conducting sleeve from influencing current transformer error.

Claims

1. electronic type High Level AC Voltage current transformer, be used between the filtering capacitor group of direct current electric transmission and transformation system, comprise the primary conductive bar, base, be installed in supporting insulator on the base, be fixed on the high pressure body on the supporting insulator, be installed in the low-power coil in the high pressure body, the collector that is connected with low-power coil output; Described primary conductive bar runs through the high pressure body and is installed in the geometric center of the low-power coil in the high pressure body; Described collector output measuring-signal; It is characterized in that, be connected with noninductive resistance between the described low-power coil output.

2. a kind of electronic type High Level AC Voltage current transformer according to claim 1, it is characterized in that described low-power coil comprises annular insulation protection box, is placed on the interior ring shielding box of annular insulation protection box, is placed on the interior annular core of ring shielding box, is wound on the outer secondary winding of ring shielding box; The inner ring of described ring shielding box is provided with annular opening.