CN203178459U - GIS partial discharge UHF detection verification signal injection device - Google Patents

Abstract

A GIS (Gas Insulated Switchgear) partial discharge UHF (Ultra High Frequency) detection verification signal injection device comprises a transmitting antenna; wherein an epoxy resin material having a relative permeability of 1.0 and a relative dielectric constant of 4.0 is cast in a housing of a rectangular barrel, so as to package a stepped-tooth-form log-periodic wedge antenna, the housing is provided with an antenna terminal, the stepped-tooth-form log-periodic wedge antenna is in a partial spherical shell shape capable of tightly contacting with an external surface of a GIS basin-type insulator, the wire diameter of the antenna is from 0.05m to 0.34m, the width of the antenna is 40mm, and an input impedance of the antenna is 50 ohm; a half-power beam width between an E plane and an H plane of the antenna is 66 degrees, the gain is 9.2dB, a standing-wave ratio within an operating frequency range is less than 1.45, the maximum value of a main lobe is in the direction of vertically leaving a summit, and transmitting is linearly polarized. The GIS partial discharge UHF detection verification signal injection device of the utility model can inject a verification signal to GIS equipment to perform sensitivity verification in the case that the GIS equipment is only provided with one built-in type UHF sensor or one external UHF sensor.

Description

The device that GIS shelf depreciation UHF detection check signal injects

Technical field

The utility model relates to a kind of device of GIS shelf depreciation UHF detection check signal.

Background technology

In recent years, gas-insulated switchgear (Gas Insulated Switchgear is hereinafter to be referred as GIS) partial-discharge ultrahigh-frequency (Ultra High Frequency is hereinafter to be referred as UHF) detection technique has obtained greatly developing and using in China.Use the UHF detection technique and repeatedly found the inner shelf depreciation defective of GIS, avoided the generation of GIS insulation fault, for the safe and reliable operation that guarantees electric system has been made significant contribution.Therefore, China's electric system will be widelyd popularize GIS shelf depreciation UHF detection technique.

In GIS shelf depreciation UHF detects, the UHF sensor need be installed on the GIS equipment, be used for the UHF electromagnetic wave signal that the inner shelf depreciation of receiving equipment is launched.The sensitivity of UHF detection system is subjected to the influence of factors such as sensor performance, sensor mounting means and installation site, GIS structure.For sensitivity and the validity that guarantees the UHF detection system, UHF sensor and the pick-up unit needed badly being installed on the GIS equipment carry out field-checking.

The on-site calibrating method that the CIGRE TF15/33.03.05 working group of international conference on large HV electric systems is recommended has obtained domestic and international electric power scientific and technical personnel's approval gradually, as shown in Figure 1.The operation steps of this method of calibration is as follows:

(1) as shown in Figure 1.At GIS equipment 2 built-in UHF sensors (Coupler), that is: C are installed ₁And C ₂C is being installed ₁The GIS inside cavity shelf depreciation defective is set, make it under the effect of applied voltage, produce 5pC(GIS equipment criterion of acceptability) shelf depreciation, adopt C this moment ₂Measure the UHF electromagnetic wave signal that this shelf depreciation is launched with the UHF checkout equipment, and tracer signal amplitude A.

(2) remove (1) step in the shelf depreciation defective.With pulse producer (Pulse Generator is called for short PG) and C ₁Connect, pass through C ₁To GIS internal emission UHF electromagnetic wave signal, adopt C ₂Measure with the UHF checkout equipment, and observation signal amplitude B.As shown in Figure 2.The output voltage amplitude of PG is adjustable continuously.Can change it to the UHF electromagnetic intensity of GIS internal emission by adjusting the PG output voltage.When UHF signal amplitude identical (B=A) that this signal amplitude and 5pC shelf depreciation are launched, note PG output voltage amplitude V this moment _PG

(3) carry out rating test at the scene, as shown in Figure 3.Select two sensors, that is: C at GIS equipment ₁And C ₂With pulse producer and sensor C ₁Connect, inject the UHF electromagnetic wave signal to the GIS inside cavity.With UHF pick-up unit and sensor C ₂Connect, for detection of the UHF signal.The PG output voltage amplitude is set to V _PG, so the intensity of the signal that injects to GIS inside is equivalent to the shelf depreciation of 5pC.If pick-up unit can detect tangible signal, then think C ₂Can detect C ₁With C ₂The shelf depreciation of 5pC between the position.

In above-mentioned method of calibration, be in lab investigation and field experiment, all need two built-in UHF sensors be installed at GIS equipment.Yet because the exploitation of UHF detection technique and application lag behind the application of GIS equipment far away.With regard to domestic, just begin the eighties in last century to widely apply GIS equipment, and the UHF detection technique starts from the beginning of this century.On present most GIS equipment built-in UHF sensor is not installed, and when minority GIS new equipment was implemented built-in UHF detection technique, each GIS had only 1 built-in UHF sensor at interval.Therefore, a built-in UHF sensor is only being arranged on the GIS equipment or only having under the situation of external UHF sensor, adopt what device how to inject checking signal to GIS equipment and carry out the sensitivity verification, this is the technical matters that needs to be resolved hurrily in the current field-checking.

The utility model content

Technical problem to be solved in the utility model, just provide the device that a kind of GIS shelf depreciation UHF detection check signal injects, the utility model can only have a built-in UHF sensor or only have under the situation of external UHF sensor on the GIS equipment, inject checking signal to GIS equipment and carry out the sensitivity verification, and have UHF electromagnetic wave emission efficiency height, UHF signal safe and reliable, emission is similar to shelf depreciation, and advantage convenient for installation and maintenance.

Solve the problems of the technologies described above, the utility model adopts following technical scheme:

The device that a kind of GIS shelf depreciation UHF detection check signal injects, comprise pulse producer and emitting antenna, the pulse output end mouth of pulse producer links to each other with the connection terminal of emitting antenna, it is characterized in that: described sending antenna structure is: being cast with relative permeability in the shell of rectangle cylindrical shell is 1.0, relative dielectric constant is 4.0 epoxide resin material, epoxide resin material encapsulates terraced profile of tooth logarithm period wedge antenna and feeder line together, be provided with antenna terminal at the bottom of the outer thimble outward, ladder profile of tooth logarithm period wedge antenna is the part spherical shell shape that can contact with GIS disc insulator intimate, the antenna max line directly is 0.34m, minimum line directly is 0.05m, width is 40mm, and input impedance is 50 ohm.

The half power beamwidth (HPBW) of described antenna E face and H face is 66 degree, and gaining is 9.2dB, and less than 1.45, the main lobe maximal value is emitted as linear polarization on the direction of vertically leaving the summit at operating frequency range standing internal wave ratio.

So antenna can improve emission efficiency greatly.

Beneficial effect:

(1) safe reliability height.The outside surface that UHF emitting antenna and pulse producer is installed in the GIS disc insulator just can be realized the electromagnetic wave signal to GIS internal emission UHF, adopts this launching technique not need GIS is done any change, need not have a power failure, and does not influence the normal operation of GIS.

(2) UHF electromagnetic wave emission efficiency height: utilize linear polarized antenna as emitting antenna, consistent with polarization mode between the GIS joint flange, greatly reduce UHF by the decay of disc insulator in the GIS internal communication process.

(3) Fa She UHF signal is similar to shelf depreciation: terraced profile of tooth logarithm period wedge antenna is as emitting antenna, and its bandwidth of operation is 0.3～2GHz, and is consistent with GIS Partial Discharge Detection frequency band.

(4) the built-in UHF sensor of a large amount of installations has been avoided in this emission sensor and pulse producer installation, easy to maintenance, can reduce a large amount of material resources, financial resources and manpower for kiowatt, increases economic efficiency, and ensures the security of operation of power equipment.

The utility model is tested at GIS equipment according to pre-designing requirement, and effect reaches expectation, detects respond well.

Description of drawings

Fig. 1 is one of GIS shelf depreciation UHF detecting instrument on-site calibrating method synoptic diagram of CIGRE TF15/33.03.05 working group recommendation;

Fig. 2 is two of the GIS shelf depreciation UHF detecting instrument on-site calibrating method synoptic diagram recommended of CIGRE TF15/33.03.05 working group;

Fig. 3 is three of the GIS shelf depreciation UHF detecting instrument on-site calibrating method synoptic diagram recommended of CIGRE TF15/33.03.05 working group;

Fig. 4 is external UHF electromagnetic wave signal method for implanting synoptic diagram;

Fig. 5 is terraced profile of tooth logarithm period wedge antenna minimax line footpath synoptic diagram;

Fig. 6 is terraced profile of tooth logarithm period wedge antenna structure cross-sectional schematic;

Fig. 7 is the left view of Fig. 6;

Fig. 8 is the vertical view of Fig. 6.

Fig. 9 is the upward view of Fig. 6.

Among the figure: 1-emitting antenna, 2-epoxide resin material, 3-antenna casing, 4-connection terminal, 5-feeder line, 6-GIS housing, 7-disc insulator.

Embodiment

Fig. 1 to Fig. 3 is the GIS shelf depreciation UHF detecting instrument on-site calibrating method synoptic diagram that CIGRE TF15/33.03.05 working group is recommended.

Referring to Fig. 4, the method that the GIS shelf depreciation UHF detection check signal that the utility model proposes injects is characterized in that: may further comprise the steps:

S1 links to each other the pulse output end mouth of pulse producer PG with the connection terminal of emitting antenna, pulse producer reaches following parameter: pulse voltage rising edge steepness is less than or equal to 0.3ns, error is no more than 10%, pulse voltage amplitude is adjustable continuously at 0～100V, regulate extreme difference 1V, output impedance is 50 Ω;

S2 is placed on the GIS device external with emitting antenna and pulse producer, the radiating surface of emitting antenna is placed on GIS disc insulator outside surface and towards GIS inside, by the disc insulator between the GIS cylindrical shell joint flange to GIS internal radiation UHF electromagnetic wave signal;

Emitting antenna max line footpath R _Max, minimum line footpath R _MinComputing method as follows:

R _max＝1/2λ _max （1）

R _min＝1/2λ _min （2）

Wherein:

λ _max＝v/f _min （3）

λ _min＝v/f _max （4）

$v=c\·\sqrt{\frac{{\mathrm{\μ}}_r}{{\mathrm{\ϵ}}_r}}---\left(5\right)$

λ _Max, λ _MinBe UHF electromagnetic wave maximum, minimum wavelength, v is the velocity of propagation of UHF electromagnetic wave in mould material, f _Min, f _MaxBe electromagnetic minimum, the highest frequency of UHF, c(=3 * 10 ⁸M/s) be the velocity of propagation of UHF electromagnetic wave in the vacuum medium, μ _rBe the relative permeability of mould material, ε _rRelative dielectric constant for mould material.

In the method: between adjacent two sections tubular cavitys of GIS round metal disc insulator is arranged, this disc insulator is the epoxy resin insulating material, and GIS cavity joint flange width is not less than 50mm, and two flanges and disc insulator edge constitute planar waveguide.The input end of emitting antenna is connected with pulse producer, and the antenna emitting surface is towards the GIS inside cavity, and the UHF electromagnetic wave that transmission antennas transmit goes out passes disc insulator and arrives GIS inside, propagates to two ends then.

Referring to Fig. 5, Fig. 6, Fig. 7, Fig. 8 and Fig. 9, in said method, the device that used GIS shelf depreciation UHF detection check signal injects, comprise pulse producer and emitting antenna, the pulse output end mouth of pulse producer links to each other with the connection terminal of emitting antenna, emitting antenna is terraced profile of tooth logarithm period wedge antenna, the encapsulating material of antenna adopts that relative permeability is 1.0, relative dielectric constant is 4.0 epoxide resin material, the antenna max line directly is 0.34m, minimum line directly is 0.05m, width is 40mm, and input impedance is 50 ohm; Antenna is the part spherical shell shape that can contact with GIS disc insulator intimate, can improve emission efficiency like this.

This device is easy to operate, quick, emission efficiency is high, can simulate the UHF electromagnetic wave signal that shelf depreciation produces at the GIS device interior, for the demarcation of external and built-in UHF sensor and pick-up unit provides reference signal source.

Connect between the metal flange face of adjacent two sections GIS cavitys parallel to each otherly, constituted planar waveguide.When electromagnetic wave passed through this structure, the direction of an electric field of portion's generation within it was perpendicular to flange face.In order to improve the efficient of passing through of UHF electromagnetic wave signal, the utility model is preferentially selected linear polarized antenna, makes its electromagnetic direction of an electric field of launching also perpendicular to flange face.

In order to simulate the UHF electromagnetic wave signal that shelf depreciation is launched more approx, range of energy distribution (0.3～2GHz) working band as emitting antenna of the local discharge signal of the utility model selected element.

In order further to improve the antenna emission efficiency, reduce energy and scatter and disappear, the utility model is made the antenna emitting surface becomes the part spherical shell shape, enters the GIS inside cavity in the set of signals that makes antenna launch.

Adopt epoxide resin material cast antenna in the utility model, its relative permeability is 1.0, and relative dielectric constant is 4.0, and according to (5) formula, the electromagnetic wave velocity of propagation v of portion within it is: 2 * 10 ⁸M/s.

Lower limit frequency of operation f _MinBe 3 * 10 ⁸Hz is according to (3) formula, maximum wavelength λ _MaxFor: 0.67m.

According to (1) formula, antenna line footpath R _MaxBe 0.34m.

In like manner, according to (2), (4) formula, antenna line footpath R _MinBe 0.05m.

In addition, the thickness of antenna width W and insulator is close, value 0.04m.

The half power beamwidth (HPBW) of this antenna E face and H face is 66 degree, and gaining is 9.2dB, compares less than 1.45 at the operating frequency range standing internal wave.The main lobe maximal value is emitted as linear polarization on the direction of vertically leaving the summit.

The external signal method for implanting that the utility model proposes and emitting antenna are mainly used in the sensitivity verification of GIS shelf depreciation UHF detecting sensor and pick-up unit, and purpose is the electromagnetic wave signal to GIS internal emission shelf depreciation UHF.Judge by detecting this signal whether the UHF sensor that is installed on the GIS equipment and the sensitivity of pick-up unit satisfy field demand.

The present invention is having innovation aspect launching technique, the antenna type selecting, has solved the problem that can't utilize built-in UHF days alignment GIS internal emission UHF electromagnetic wave signals that exists in the sensitivity verification to external UHF sensor or single built-in UHF sensor.Reduced the attenuation degree of UHF electromagnetic wave through the disc insulator formula.Saved a large amount of material resources, financial resources and manpower for electric system, stopped to have improved the safe reliability of Operation of Electric Systems because the potential safety hazard that built-in UHF sensor causes is installed.

Claims (2)

1. the device that injects of a GIS shelf depreciation UHF detection check signal, comprise pulse producer and emitting antenna, the pulse output end mouth of pulse producer links to each other with the connection terminal of emitting antenna, it is characterized in that: described sending antenna structure is: being cast with relative permeability in the shell of rectangle cylindrical shell is 1.0, relative dielectric constant is 4.0 epoxide resin material, epoxide resin material encapsulates terraced profile of tooth logarithm period wedge antenna and feeder line together, be provided with antenna terminal at the bottom of the outer thimble outward, ladder profile of tooth logarithm period wedge antenna is the part spherical shell shape that can contact with GIS disc insulator intimate, the antenna max line directly is 0.34m, minimum line directly is 0.05m, width is 40mm, and input impedance is 50 ohm.

2. the device that injects of GIS shelf depreciation UHF detection check signal according to claim 1, it is characterized in that: the half power beamwidth (HPBW) of described antenna E face and H face is 66 degree, gain is 9.2dB, compare less than 1.45 at the operating frequency range standing internal wave, the main lobe maximal value is emitted as linear polarization on the direction of vertically leaving the summit.

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