CN2328015Y

CN2328015Y - Capacitor voltage mutual inductor with harmonic detection function

Info

Publication number: CN2328015Y
Application number: CN 98232695
Authority: CN
Inventors: 朱朝昕; 王香芳
Original assignee: XI'AN ELECTRIC POWER CAPACITORS FACTORY
Current assignee: XI'AN ELECTRIC POWER CAPACITORS FACTORY
Priority date: 1998-05-08
Filing date: 1998-05-08
Publication date: 1999-07-07
Anticipated expiration: 2008-05-08

Abstract

The utility model relates to a capacitance voltage mutual inductor with harmonic detection function. The utility model aims at fully using a capacitor voltage divider in a capacitance-typed voltage mutual inductor, divides the high voltage of an electric power system, and extracts a low voltage which can introduce harmonic detection, expanding the function of the capacitance-typed voltage mutual inductor. The structure of the utility model is characterized in that a harmonic voltage-dividing capacitor C< P > is accessed between a low voltage end J of the capacitor voltage divider and the earth E (disclosed in the picture 1); the harmonic voltage-dividing capacitor C< P > is connected in series with a capacitance C< 2 > and a capacitance C< 1 >, forming a harmonic voltage extracting voltage divider which monitors a harmonic detection terminal J and the voltage which is accessed to a harmonic wave detector by the earth E end, effectively monitoring harmonic wave of an electrical network.

Description

The capacitance type potential transformer that has the harmonic wave measuring ability

The utility model relates to the equipment that ultra-high-tension power transmission line, power house, transformer station etc. effectively monitor system voltage and mains by harmonics, refers to a kind of capacitance type potential transformer that has the harmonic wave measuring ability especially.

In figure viewed from behind technology, in the market in the capacitance type potential transformer of Xiao Shouing, see shown in Figure 3ly, connect electromagnetic unit between the capacitor C 1 of series connection and the C2, in this electromagnetic unit, the simple A of transformer T _TBetween termination capacitor C1 and the C2, other end A _L Connect capacitor C 2 lower ends through compensation reactor L, insert the earth E, T level of transformer secondary coil exit a1, x1, a2, x2, af, xf, wherein vibroshock Z one termination xf holds, and the other end is as the az exit.This capacitance type potential transformer is finished voltage measurement and system's relay protection function, and in the prior art, compensation reactor L can also be placed on the simple A of transformer T among Fig. 3 _TAnd between capacitor C 1 and the C2 contact, damper Z can be connected between transformer T level af and the xf, two groups or four groups of three groups of replaceable one-tenth of T level of its transformer, these all are that needs according to the client change making, in the prior art, seeing Fig. 2, is that harmonic wave detects the capacitive divider circuit theory diagrams, this is when in high pressure (more than the rated voltage 1kv) harmonic voltage measurement overtone order or measuring accuracy being had higher the needs, just to use capacitive divider.Because when above-mentioned two kinds of autonomous devices are finished separately function, invest greatlyyer, work efficiency is lower, and manufacturing cost is also big, bothers so cause unnecessary expenditure and work to the user.

The purpose of this utility model is the weak point that overcomes in the above-mentioned figure viewed from behind technology, and develop a kind of capacitance type potential transformer that has the harmonic wave measuring ability, capacitance type potential transformer and harmonic voltage extraction capacitive divider are organically combined, finish action and function separately, reduce some parts, save expending of cost and other transportation, work etc., improve the operational availability of equipment, make things convenient for the user.

The technical solution of the utility model is as follows:

Comprise following technical scheme: assembling fuel tank 9 on the base 8, assembling is by intermediate transformer T10 in the fuel tank 9, and the electromagnetic unit that compensation reactor L11 and damper Z13 form assembles high-voltage capacitance C on fuel tank 9, the chassis 7 ₁4, middle piezoelectricity holds C ₂5 and insulator 3 and loam cake 1, it is characterized in that: in fuel tank 9, harmonic wave voltage-dividing capacitor Cp18 and middle piezoelectricity hold C ₂5, high-voltage capacitance C ₁4 are composed in series harmonic voltage extracts voltage divider, holds C by middle piezoelectricity ₂Extension line 17 is harmonic wave detection terminal J between the 5 harmonious wavelength-division piezoelectricity container C p18.

Description of drawings of the present utility model is as follows:

Fig. 1 is the capacitance type potential transformer circuit theory diagrams of band harmonic wave measuring ability;

Fig. 2 is that background technology Central Plains harmonic wave detects the capacitive divider circuit theory diagrams:

Fig. 3 is background technology Central Plains capacitance type potential transformer circuit theory diagrams;

Fig. 4 is the capacitance type potential transformer one-piece construction synoptic diagram that has the harmonic wave measuring ability.

Above-mentioned number in the figure is described as follows: the 1-loam cake, 2-connects securing member (double-screw bolt, nut, plain cushion, bullet pad), 3-insulator, 4-high-voltage capacitance C ₁, piezoelectricity holds C among the 5- ₂, press insulator among the 6-, the 7-bottom, the 8-base, 9-fuel tank, 10-intermediate transformer T, 11-compensation reactor L, 12-ground terminal E, 13-damper Z, 14-secondary connection terminal, 15-secondary connection terminal board, the earth terminal E of 16-harmonic wave voltage-dividing capacitor, 17-harmonic wave detection terminal J, 18-harmonic wave voltage-dividing capacitor Cp, the packing washer of 19-capacitive divider, 20-expander

Be that the utility model adjoint is described in further detail below: referring to Fig. 1, (see figure 3) in original technology capacitance type potential transformer, connect between the low pressure end J of capacitive divider and the ground E and insert a harmonic wave voltage-dividing capacitor Cp, be input to the harmonic wave detector by extracting voltage signal between the low pressure end J of capacitive divider and the ground E, the multi-functional harmonic analysis instrument of GXF-908C type as the production of Baoding computing machine factory, be used for detectable voltage signals door harmonic component, reflect the harmonic wave situation of electrical network by the harmonic monitoring of this voltage.In real work, during the on-line monitoring mains by harmonics, harmonic wave voltage-dividing capacitor Cp is also as capacitance type potential transformer intermediate voltage capacitor C _aThe part error of debugging capacitance type potential transformer, with the accuracy of guaranteeing voltage transformer (VT) in the permissible accuracy scope, capacitor C ₁And C ₂Constitute the high-voltage capacitor of harmonic wave capacitive divider, the public piezoelectricity container C of harmonic wave p is the low-voltage capacitance of capacitive divider.The right half part of Fig. 1 is an electromagnetic unit, the simple A of transformer T _TTermination capacitor C ₁And C ₂Between, other end A _CThrough compensation reactor L ground connection E, this is that compensation reactor L also can be placed on the simple A of transformer T _TWith capacitor C ₁, C ₂Between the contact.T level of transformer secondary coil exit a ₁, x ₁, a ₂, x ₂, a _f, x _f, termination x under the damper Z wherein _f, the upper end is a _zExit, damper z can be at exit a certainly _fAnd x _fBetween connect.Fig. 2 and Fig. 3 are background technologies, omit narration here.Fig. 4 is an equipment structure chart, is fuel tank 9 on the base 8, assembling electromagnetic unit in the fuel tank 9, and harmonic wave voltage-dividing capacitor Cp18 connects electric capacity c ₂, middle pressure insulator 6 is enclosed within on the line, as extraction tube, and the harmonic wave voltage-dividing capacitor c in the fuel tank 9 here _p18 also can be placed in the top insulator 3.Contain dodecyl benzene or condenser oil, transformer wet goods in the fuel tank 9, integral sealing.Fuel tank 9 right sides assemblings secondary connection terminal board 15, in terminal J17 is arranged, terminal E16, secondary connection terminal 14, ground terminal E12.Connect bottom 7 with securing member 2 on the

fuel tank

9,7 usefulness securing members 2 are connected insulator 3 with packing washer 19 on the bottom, assembling high-voltage capacitance C in the insulator 3 ₁Hold C with middle piezoelectricity ₂, with insulator 3 tops assembling expander 20 and loam cake 1, contain capacitors such as diarylethanes or dodecyl benzene in the insulator 3 with oil, integral sealing, according to the voltage difference, the use of also can connecting of insulator 3 integral body, these all are present technology.

Advantage of the present utility model and effect are as follows:

1, as a whole owing to two devices are merged, so satisfied voltage side amount and mains by harmonics monitoring two Plant the needs of function.

2, owing to realized the needs of two kinds of functions, so saved the part parts of original needs, not only save Make an appointment with cost and made processing charges, and be conducive to assembling, transportation and use.

3, through manufacturing experimently out series of products, can be used in the different electric power that rated voltage is 35KV, 66KV, 110KV, 220KV, 330KV, 500KV, enlarged the function usable range, expanded the ability that conforms.

Claims

1, the capacitance type potential transformer that has the harmonic wave measuring ability, comprise following technical scheme: base (8) is gone up assembling fuel tank (9), assembling is by intermediate transformer (T10) in the fuel tank (9), the electromagnetic unit that compensation reactor (L11) and damper (Z13) are formed, fuel tank (9), chassis (7) are gone up assembling high-voltage capacitance (C ₁4), middle piezoelectricity holds (C ₂5) and insulator (3) and loam cake (1), it is characterized in that: in fuel tank (9), harmonic wave voltage-dividing capacitor (Cp18) holds (C with middle piezoelectricity ₂5), high-voltage capacitance (C ₁4) be composed in series harmonic voltage and extract voltage divider, hold (C by middle piezoelectricity ₂5) extension line (17) is harmonic wave detection terminal (J) between the harmonious wavelength-division piezoelectricity container (Cp18).