CN202384166U

CN202384166U - Three-phase common-box GIS electronic-type voltage-current combined mutual inductor

Info

Publication number: CN202384166U
Application number: CN 201120443381
Authority: CN
Inventors: 张克元; 田志国; 李富生; 池立江; 颜语; 马朝阳; 刘洋
Original assignee: Xuji Group Co Ltd; XJ Electric Co Ltd; Xuchang XJ Software Technology Co Ltd
Current assignee: XJ Electric Co Ltd; Xuchang XJ Software Technology Co Ltd
Priority date: 2011-11-10
Filing date: 2011-11-10
Publication date: 2012-08-15
Anticipated expiration: 2021-11-10

Abstract

The utility model relates to a three-phase common box GIS electronic voltage and current combination transformer, which comprises a three-phase common box pressure vessel for passing through a primary conductor, and the pressure vessel is insulated and fixed with a three-phase primary conductor. The suspension potential tube is arranged on the shaft, the outer wall of the suspension potential tube is covered with a copper foil layer, and an insulating medium layer is arranged between the suspension potential tube and the copper foil layer. Since the existing GIS transformers are widely used, redesigning and replacing them will cause a lot of waste. However, the utility model has simple structure and high insulation strength, and is improved on the basis of existing mutual inductors. Coaxial capacitors are gradually arranged outward from the primary conductor, with high insulation performance and enhanced reliability and stability. Realize simultaneous detection of current and voltage, compact structure, high precision, and greatly reduce the cost.

Description

A kind of three-phase combined type GIS electronic type voltage currents combination instrument transformer

Technical field

The utility model relates to a kind of three-phase combined type GIS electronic type voltage currents combination instrument transformer.

Background technology

Along with electric power system to big capacity, superhigh pressure and ultra high voltage direction develop, to the power equipment miniaturization, intellectuality, the requirement of high reliability is also increasingly high.Conventional electromagnetic potential transformer or capacitance type potential transformer insulation system are complicated, volume increases, cost is high; Loaded down with trivial details, the usage space of connecting up is big, complicated operation when installing; Supersaturation takes place easily; There are shortcomings such as remanent magnetism, magnetic saturation, ferro resonance, dynamic range is little, have been difficult to satisfy the application development requirement of electric power system.So many now employing electronic currents, voltage transformer provide conventional instrument transformer.

Electronic current mutual inductor adopts Luo-coil, small-power coil or magneto-optical sensor.With the signal that collects, through the anti-phase of collector internal circuit, integration, amplification, opto-electronic conversion becomes light signal to insert merge cells through optical fiber, finally sends to the protection equipment of measuring.

Electronic type voltage transformer is a kind of voltage transformer that utilizes coaxial capacitance series connection voltage divider principle to form.Chinese patent file 200710169091.1 novel high voltage combined independent electronic type currents, voltage transformer; 201020606808.1 1 kinds of gas-insulated electronic type voltage transformers of Chinese patent file; These two pieces of patent documents have disclosed the basic structure and the principle (being single-phase mode) of electronic type voltage transformer, repeat no more at this.It is to be noted; The structure of the electronic type voltage transformer disclosed in these two pieces of patent documents; Coaxial capacitance is arranged in the Primary Conductor chamber at Primary Conductor place; Electrode is arranged on the shielding cylinder inboard, and high-low voltage capacitor all is the axle center with the Primary Conductor, and this mode causes puncture easily when decreasing insulating.

The utility model content

The purpose of the utility model provides a kind of three-phase combined type GIS electronic type voltage currents combination instrument transformer, on the architecture basics of original GIS instrument transformer, realizes electronic current combination of voltages instrument transformer.

For realizing above-mentioned purpose; The scheme of the utility model is: a kind of three-phase combined type GIS electronic type voltage currents combination instrument transformer; The pressure vessel that comprises the three-phase combined type that is used to wear Primary Conductor; Insulation is fixed with the floating potential tube that is used for the coaxial setting of three-phase Primary Conductor on the said pressure vessel, is covered with copper foil layer on the floating potential drum outer wall, is provided with insulating medium layer between floating potential tube and the copper foil layer; Also be equipped with on the said floating potential drum outer wall and all press shielding cylinder; Combination transformer comprises electronic current mutual inductor and coaxial capacitance electronic type voltage transformer, and the coil of electronic current mutual inductor is arranged on saidly all presses in the shielding cylinder; Said coaxial capacitance electronic type voltage transformer comprises the high-voltage capacitance and the low-voltage capacitance of equivalent series, and it is that dielectric is formed said high-voltage capacitance that said Primary Conductor, floating potential tube reach with the SF6 insulating gas between them; It is that dielectric is formed said low-voltage capacitance that floating potential tube, copper foil layer reach with the said insulating medium layer between them.

Said copper foil layer ground connection.The low-voltage capacitance two ends connect the voltage signal acquisition unit through high temperature resistant multiple twin shielding conductor.Be parallel with the capacitance-resistance divider resistance between the input of said voltage signal acquisition unit.The finish lead of said electronic current mutual inductor connects the current signal collecting unit through high temperature resistant multiple twin shielding conductor.Said electronic current mutual inductor is a Luo-coil.

Because existing GIS instrument transformer uses extensively, designs replacement again and can cause very big waste.And the utility model structure is terse, dielectric strength is big, on existing instrument transformer basis, improves forming.Coaxial capacitance outwards arranges progressively that from Primary Conductor insulation property are high, and reliability and stability strengthens.Detect when realizing electric current, voltage, compact conformation, precision is high, greatly reduces cost.

Description of drawings

Fig. 1 is the structural representation of the combination transformer of the utility model;

Fig. 2 is the floating potential barrel structure figure of the utility model;

Fig. 3 is the electronic type voltage transformer equivalent circuit diagram of the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is done further detailed explanation.

Like Fig. 1, Fig. 2, a kind of three-phase combined type GIS electronic type voltage currents combination instrument transformer shown in Figure 3; The pressure vessel 4 that comprises the common box type that is used to wear three-phase Primary Conductor 5; Insulation is fixed with three floating potential tubes 7 coaxial with Primary Conductor 5 on the pressure vessel 4; Be covered with copper foil layer 8 on floating potential tube 7 outer walls, be provided with insulating medium layer 20 between floating potential tube 7 and the copper foil layer 8; Also be equipped with on floating potential tube 7 outer walls and all press shielding cylinder 6 (aluminum hull); Need insulation processing between floating potential cylindrical shell 7 and the pressure vessel 4.

Combination transformer comprises electronic current mutual inductor and coaxial capacitance electronic type voltage transformer, and the coil 11 of electronic current mutual inductor is arranged on said all the pressure in the shielding cylinder 6; Luo-coil in the current transformer (small-power iron-core coil) 11 epoxy castings place aluminum hull 6.

Said coaxial capacitance electronic type voltage transformer comprises the high-voltage capacitance C1 and the low-voltage capacitance C2 of equivalent series, said Primary Conductor 5, floating potential tube 7 and be that dielectric 9 is formed said high-voltage capacitance C1 with the SF6 insulating gas between them; Floating potential tube 7, copper foil layer 8 and be that dielectric is formed said low-voltage capacitance C2 with the said insulating medium layer between them 20.Floating potential cylindrical shell 7 is a floating potential, covers Copper Foil 8 ground connection.Through gathering the voltage U i that low-voltage capacitance C2 two ends low pressure U0 and relevant capacitor value can be known Primary Conductor 2.Insulating medium layer 22 is the solid dielectric insulation layer (adopt epoxy fibreglass or utilize double face copper directly to form low-voltage capacitance) of SF6 gas-insulated medium layer or increase.

Luo-coil 11 lead-out wires and voltage sensor head lead-out wire adopt high temperature resistant multiple twin shielding conductor to cause binding post 2; From binding post 2 signal being introduced collecting unit 1 with lead again (is divided into voltage signal acquisition unit and current signal collecting unit, is parallel with capacitance-resistance divider resistance R between the input of voltage signal acquisition unit.), live collector 1 and binding post 2 by shielding cover cap 3, reserve wire hole output digital signal line, signal is exported through optical fiber.Behind suitable resistance of parallel connection voltage signal is being introduced binding post 2 between high-voltage capacitance and the low-voltage capacitance, current signal causes binding post 2, introduces collecting unit 1 by binding post 2, and collecting unit 1 converts digital optical signal to and exports through optical fiber.Collecting unit is installed in the radome 3, improves the operational environment of electronic loop, reduces electromagnetic interference, and power supply is collecting unit 1 power supply on the spot, overcomes the problem that active instrument transformer exists, and power supply is stable.10 is bucking electrode.Low-voltage capacitance output two ends and the United Nations General Assembly's resistance form high voltage and suppress circuit.

Claims

1. A three-phase common box GIS electronic voltage-current combination transformer, including a pressure vessel for piercing a three-phase common box for a primary conductor, characterized in that, the pressure vessel is insulated and fixed with a three-phase primary Suspension potential cylinder with conductor coaxial arrangement, the outer wall of the suspension potential cylinder is covered with a copper foil layer, and an insulating medium layer is provided between the suspension potential cylinder and the copper foil layer; the outer wall of the suspension potential cylinder is also pierced with a voltage equalizing shielding cylinder ;

The combined transformer includes an electronic current transformer and a coaxial capacitive electronic voltage transformer, and the coil of the electronic current transformer is arranged in the voltage equalizing shielding cylinder;

The coaxial capacitor electronic voltage transformer includes an equivalent series connected high-voltage capacitor and a low-voltage capacitor, the primary conductor, the suspension potential tube and the SF6 insulating gas between them form the high-voltage capacitor; the suspension potential tube , copper foil layer and the insulating medium layer between them as the insulating medium to form the low-voltage capacitor.

2. A three-phase common box GIS electronic combined voltage and current transformer according to claim 1, characterized in that the copper foil layer is grounded.

3. A three-phase common box GIS electronic voltage-current combined transformer according to claim 1, characterized in that the two ends of the low-voltage capacitor are connected to the voltage signal acquisition unit through a high-temperature-resistant twisted-pair shielded wire.

4 . The three-phase common box GIS electronic voltage-current combined transformer according to claim 3 , wherein a resistance-capacitance voltage dividing resistor is connected in parallel between the input terminals of the voltage signal acquisition unit.

5. A kind of three-phase co-box GIS electronic voltage-current combined transformer according to claim 1, characterized in that, the coil outlet end of the electronic current transformer is connected to the current signal acquisition through a high-temperature-resistant twisted-pair shielded wire unit.

6 . A three-phase common box GIS electronic combined voltage and current transformer according to claim 5 , wherein the electronic current transformer is a Rogowski coil.