CN118191431A - Dielectric loss testing device for GIS basin-type insulator - Google Patents
Dielectric loss testing device for GIS basin-type insulator Download PDFInfo
- Publication number
- CN118191431A CN118191431A CN202410299368.6A CN202410299368A CN118191431A CN 118191431 A CN118191431 A CN 118191431A CN 202410299368 A CN202410299368 A CN 202410299368A CN 118191431 A CN118191431 A CN 118191431A
- Authority
- CN
- China
- Prior art keywords
- dielectric loss
- insulator
- full
- standard
- basin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 92
- 239000012212 insulator Substances 0.000 title claims abstract description 70
- 239000003990 capacitor Substances 0.000 claims abstract description 32
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 7
- 230000007613 environmental effect Effects 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 7
- 230000005684 electric field Effects 0.000 claims description 5
- 239000011152 fibreglass Substances 0.000 claims description 3
- 230000004907 flux Effects 0.000 claims description 3
- 230000005415 magnetization Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 238000009413 insulation Methods 0.000 description 7
- 230000032683 aging Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Testing Relating To Insulation (AREA)
Abstract
The invention relates to the technical field of high-voltage electrical equipment testing, and discloses a dielectric loss testing device of a GIS basin-type insulator, which comprises a test power supply, a standard capacitor, a current comparator type bridge and a full-size insulator testing tool for controlling the environmental condition of the basin-type insulator to be tested, wherein the full-size insulator testing tool is used for reducing the influence of stray capacitance and shielding the interference of an external electromagnetic field, the full-size insulator testing tool is respectively connected with the high-voltage power supply, the standard capacitor and the current comparator type bridge, the test power supply is connected with the standard capacitor and the current comparator type bridge, the standard capacitor is connected with the current comparator type bridge, and the full-size insulator testing tool shell, the standard capacitor and the current comparator type bridge are grounded. According to the invention, the standard dielectric loss device is tested by the full-size insulator test tool, the shielding effect is good, and the accuracy of the test result is high.
Description
Technical Field
The invention relates to the technical field of high-voltage electrical equipment testing, in particular to a dielectric loss testing device of a GIS basin-type insulator.
Background
The fully-closed combined electrical apparatus (GIS) is an important device in an electric power system, and the insulation performance of a GIS basin-type insulator is an important factor affecting the normal operation of the GIS device. Dielectric loss of an insulating material is an important index for evaluating insulation aging and insulation performance of electrical equipment. Currently, in the test of GIS solid insulation, no related dielectric loss test method is available for evaluating the insulation state of the basin-type insulator. Therefore, aiming at the problems of insulator aging test or in-service GIS insulator insulation state evaluation of a transformer substation, it is necessary to research a method for dielectric loss test of a GIS basin-type insulator.
The testing technology of dielectric loss of high-voltage electrical equipment is relatively mature, but because the capacitance value of the GIS basin-type insulator is very small, if the stray capacitance of the testing system cannot be effectively controlled in the picofarad order, the accuracy of the testing result is greatly affected. In field tests, other high voltage devices operating in the vicinity of the test object inevitably interfere with the test results of the dielectric loss of the test object.
Disclosure of Invention
The invention provides a dielectric loss testing device of a GIS basin-type insulator, which tests a standard dielectric loss device through a full-size insulator testing tool, has good shielding effect and high accuracy of testing results.
The invention provides a dielectric loss testing device of a GIS basin-type insulator, which comprises a test power supply, a standard capacitor, a current comparator type bridge and a full-size insulator testing tool for controlling the environmental condition of the basin-type insulator to be tested, wherein the full-size insulator testing tool is used for reducing the influence of stray capacitance and shielding the interference of external electromagnetic fields, the full-size insulator testing tool is respectively connected with the high-voltage power supply, the standard capacitor and the current comparator type bridge, the test power supply is connected with the standard capacitor and the current comparator type bridge, the standard capacitor is connected with the current comparator type bridge, and the full-size insulator testing tool shell, the standard capacitor and the current comparator type bridge are grounded.
Furthermore, the connecting wire of the dielectric loss testing device adopts a shielding wire, and shielding layers are mutually connected together to enable induced charges caused by an external electric field to be directly connected to the ground through the shielding or to be connected to the ground through a test transformer coil through the shielding; the dielectric loss test device is used for dielectric loss test of insulators and can be applied to field test.
Further, the rated voltage of the standard capacitor is 60kV, and the rated capacity is 10pF.
Further, the current comparator bridge parameters include: dielectric loss resolution is 1 multiplied by 10 -6, dielectric loss precision is +/-0.5 percent rdg +/-5 multiplied by 10 -5, capacitance resolution is 0.001pF, and capacitance precision is +/-0.02 percent rdg +/-0.01.
Further, 4 movable bases are placed at the bottom of the full-size insulator testing tool, and glass fiber reinforced plastic cylindrical bodies for supporting the tested basin-type insulators are fixed on the bases; the periphery of the basin-type insulator is tightly wrapped with a layer of metal annular electrode, a port for connecting a measuring wire is arranged on the metal annular electrode, openings are formed in the upper side and the right side metal surface of the full-size insulator testing tool, and a high-voltage wire and the measuring wire are connected.
Further, the current comparator bridge winds two windings with the turns of W s and W x on the annular iron core, and then winds an indication winding W d,Wd and is connected with a zero indicator D in parallel to form a current comparator, and the current comparator works in the linear range of the magnetization characteristic of the iron core;
C x is a sample, C s is a nondestructive standard capacitor, R is a standard adjustable resistor, C is a midpoint grounding capacitor of R and C s, C x is connected with W s,Cs and R, R is connected with W x, and C is connected between C s and R and grounded;
I x is the current flowing through C x and W x, W x is also known as the measurement arm winding; i s、IR flows through C s and R, W s, respectively, W s is called the standard arm winding;
The ampere turns on W x and W s can be equal by adjusting the turns of W x、Ws and the resistance of R, and the magnetic fluxes phi x and phi s generated on the iron core are equal and opposite in direction due to the opposite winding directions of W x and W s, the induced electromotive force on W d is zero, the zero indicator is zero, and the current comparator is in a balanced state.
Further, in the current comparator bridge, C x is still regarded as a series equivalent circuit, and the internal resistance of W x、Ws is negligible compared with the impedance of C x、Cs, so that:
Ix＝UxjwCx/(1+jwRxCx)
Is＝UjwCs(1+jwRC)/[1+jwR(C+Cs)]
IR＝Is(1+jwRC)＝UjwCs[1+jwR(C+Cs)]
Substituting I x、IR into ampere-turn balance condition W xIx＝WsIR and developing, and separating the real and imaginary parts can obtain:
Cx＝CsWs/Wx
Rx＝R(C+Cs)Wx/(CsWs)
tanδ＝wRxCx＝wR(C+Cs)
the corresponding values when the parallel equivalent circuit represents the sample can be obtained by the method:
tanδ＝1/(wRxCx)＝wR(C+Cs)
Cx＝CsWs/[(1+tan2δ)Wx]＝CsWs/Wx
Bridge accuracy depends on the accuracy of standard element R, C, C s and W s、Wx, W s and W x being the number of turns of the standard arm and measurement arm windings of the current comparator.
The beneficial effects of the invention are as follows:
The invention comprises a high-voltage test power supply, a standard capacitor, a current comparator bridge and a dielectric loss testing device of a full-size insulator testing tool, wherein the full-size insulator testing tool reduces the influence of stray capacitance, shields the interference of an external electromagnetic field, adopts a shielding wire for connecting wires, and leads induction charges caused by the external electric field to be directly connected to the ground through the shielding or to be grounded through a test transformer coil through the shielding, thereby being applicable to the dielectric loss testing of the current insulator, being applicable to field testing, having good shielding effect and high testing result accuracy.
Drawings
Fig. 1 is a schematic structural diagram of a dielectric loss testing device of a GIS basin-type insulator according to the present invention.
FIG. 2 is a schematic diagram of a current comparator bridge according to the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the invention provides a dielectric loss testing device of a GIS basin-type insulator, which comprises a test power supply, a standard capacitor, a current comparator-type bridge and a full-size insulator testing tool for controlling the environmental condition of the basin-type insulator to be tested, wherein the full-size insulator testing tool is used for reducing the influence of stray capacitance and shielding the interference of an external electromagnetic field, the full-size insulator testing tool is respectively connected with the high-voltage power supply, the standard capacitor and the current comparator-type bridge, the test power supply is connected with the standard capacitor and the current comparator-type bridge, the standard capacitor is connected with the current comparator-type bridge, and the full-size insulator testing tool shell, the standard capacitor and the current comparator-type bridge are grounded.
Because the capacitance of the basin-type insulator is very small, if the insulation state of the basin-type insulator is judged through the dielectric loss of the insulator, the stray capacitance of the surrounding environment of the insulator is required to be fixed to reflect the difference of the characteristic quantity of the dielectric loss of the insulator in different aging stages, and the full-size insulator dielectric loss test tool is designed and mainly used for reducing the influence of the stray capacitance, and simultaneously shielding the interference of an external electromagnetic field, a shielding wire is adopted for connecting wires, and shielding layers are mutually connected to enable the induction charge caused by the external electric field to be directly connected to the ground through the shielding or be connected to the ground through the shielding through a test transformer coil.
The rated voltage of the standard capacitor is 60kV, and the rated capacity is 10pF. The current comparator bridge parameters include: dielectric loss resolution is 1 multiplied by 10 -6, dielectric loss precision is +/-0.5 percent rdg +/-5 multiplied by 10 -5, capacitance resolution is 0.001pF, and capacitance precision is +/-0.02 percent rdg +/-0.01. 4 movable bases are placed at the bottom of the full-size insulator testing tool, and glass fiber reinforced plastic cylindrical bodies for supporting the tested basin-type insulators are fixed on the bases; the periphery of the basin-type insulator is tightly wrapped with a layer of metal annular electrode, a port for connecting a measuring wire is arranged on the metal annular electrode, openings are formed in the upper side and the right side metal surface of the full-size insulator testing tool, and a high-voltage wire and the measuring wire are connected. The test fixture shell, the standard capacitor and the current comparator type bridge are grounded, and the fixed basin-type insulator stray capacitance is effectively realized.
The principle wiring of the current comparator bridge is shown in fig. 2, the current comparator bridge winds two windings with the number of turns of W s and W x on the annular iron core, and then winds an indication winding W d,Wd and is connected with a zero indicator D in parallel to form a current comparator, and the current comparator works in the linear range of the magnetization characteristic of the iron core. C x is a sample, C s is a nondestructive standard capacitor, R is a standard adjustable resistor, C is a midpoint grounding capacitor of R and C s, C x is connected with W s,Cs and R, R is connected with W x, and C is connected between C s and R and grounded; i x is the current flowing through C x and W x, W x is also known as the measurement arm winding; i s、IR flows through C s and R, W s, respectively, W s is called the standard arm winding; when the number of turns of W x、Ws and the resistance of R are properly regulated, the ampere turns on W x and W s can be equal, and the winding directions of W x and W s are opposite, so that the magnetic fluxes phi x and phi s generated on the iron core are equal and opposite in direction, the induced electromotive force on W d is zero, the zero-pointing instrument is zero, and the current comparator is in an equilibrium state.
As shown in fig. 2, in the current comparator bridge, C x is still regarded as a series equivalent circuit, and the internal resistance of W x、Ws is negligible compared with the impedance of C x、Cs, so that:
Ix＝UxjwCx/(1+jwRxCx)
Is＝UjwCs(1+jwRC)/[1+jwR(C+Cs)]
IR＝Is(1+jwRC)＝UjwCs[1+jwR(C+Cs)]
Substituting I x、IR into ampere-turn balance condition W xIx＝WsIR and developing, and separating the real and imaginary parts can obtain:
Cx＝CsWs/Wx
Rx＝R(C+Cs)Wx/(CsWs)
tanδ＝wRxCx＝wR(C+Cs)
the corresponding values when the parallel equivalent circuit represents the sample can be obtained by the method:
tanδ＝1/(wRxCx)＝wR(C+Cs)
Cx＝CsWs/[(1+tan2δ)Wx]＝CsWs/Wx
The accuracy of the bridge depends on the accuracy of standard elements R, C, C s and W s、Wx, W s and W x are the number of turns of the standard and measurement arm windings of the current comparator, which can be done very precisely, so that the accuracy of the measurement of the bridge is guaranteed. The low voltage arm has a much smaller effect on the stray capacitance of the shield than the western bridge. Under balanced conditions, the internal resistances of W s and W x are small, only about 0.6Ω per 100 turns, so the influence of stray capacitance shunting in the vicinity is negligible. The standard arm is also connected with a neutral point grounding capacitor C, and the capacitance value of the neutral point grounding capacitor C is much larger than that of the stray capacitance, so that the influence of the stray capacitance nearby the neutral point grounding capacitor C is negligible. The current comparator is composed of windings, and the turns ratio is more stable than the values of the resistor and the capacitor element, so that the stability is high when the capacitor is measured. Therefore, a current comparator bridge is selected for testing.
The invention comprises a high-voltage test power supply, a standard capacitor, a current comparator bridge and a dielectric loss testing device of a full-size insulator testing tool, wherein the full-size insulator testing tool reduces the influence of stray capacitance, shields the interference of an external electromagnetic field, adopts a shielding wire for connecting wires, and leads induction charges caused by the external electric field to be directly connected to the ground through the shielding or to be grounded through a test transformer coil through the shielding, thereby being applicable to the dielectric loss testing of the current insulator, being applicable to field testing, having good shielding effect and high testing result accuracy.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, apparatus, article, or method that comprises the element.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the invention.
Claims (7)
1. The utility model provides a dielectric loss testing arrangement of GIS basin-type insulator, its characterized in that includes test power supply, standard electric capacity, current comparison instrument bridge, the full-size insulator test fixture of control measured basin-type insulator environmental condition, full-size insulator test fixture is used for reducing stray capacitance's influence and shielding external electromagnetic field's interference, full-size insulator test fixture is connected respectively high-voltage power supply, standard electric capacity and current comparison instrument bridge, test power supply connects standard electric capacity and current comparison instrument bridge, standard electric capacity is connected current comparison instrument bridge, full-size insulator test fixture shell, standard electric capacity, current comparison instrument bridge, test power supply all carries out ground connection.
2. The dielectric loss testing device of the GIS basin-type insulator according to claim 1, wherein a connecting wire of the dielectric loss testing device adopts a shielding wire, and shielding layers are mutually connected together so that induced charges caused by an external electric field are directly connected to the ground through the shielding or are connected to the ground through a coil of a tested transformer through the shielding; the dielectric loss test device is used for dielectric loss test of insulators and can be applied to field test.
3. The dielectric loss testing device of the GIS basin-type insulator according to claim 1, wherein the rated voltage of the standard capacitor is 60kV and the rated capacity is 10pF.
4. The GIS basin-insulator dielectric loss testing device of claim 1, wherein the current comparator bridge parameters include: dielectric loss resolution is 1 multiplied by 10 -6, dielectric loss precision is +/-0.5 percent rdg +/-5 multiplied by 10 -5, capacitance resolution is 0.001pF, and capacitance precision is +/-0.02 percent rdg +/-0.01.
5. The dielectric loss testing device of the GIS basin-type insulator according to claim 1, wherein 4 movable bases are placed at the bottom of the full-size insulator testing tool, and glass fiber reinforced plastic cylindrical bodies for supporting the basin-type insulator to be tested are fixed on the bases; the periphery of the basin-type insulator is tightly wrapped with a layer of metal annular electrode, a port for connecting a measuring wire is arranged on the metal annular electrode, openings are formed in the upper side and the right side metal surface of the full-size insulator testing tool, and a high-voltage wire and the measuring wire are connected.
6. The dielectric loss testing device of the GIS basin-type insulator according to claim 1, wherein the current comparator bridge is formed by winding two windings with the number of turns of W s and W x on a ring-shaped iron core, winding an indication winding W d,Wd and connecting a zero indicator D in parallel, and working in the linear range of the magnetization characteristic of the iron core;
C x is a sample, C s is a nondestructive standard capacitor, R is a standard adjustable resistor, C is a midpoint grounding capacitor of R and C s, C x is connected with W s,Cs and R, R is connected with W x, and C is connected between C s and R and grounded;
I x is the current flowing through C x and W x, W x is also known as the measurement arm winding; i s、IR flows through C s and R, W s, respectively, W s is called the standard arm winding;
The ampere turns on W x and W s can be equal by adjusting the turns of W x、Ws and the resistance of R, and the magnetic fluxes phi x and phi s generated on the iron core are equal and opposite in direction due to the opposite winding directions of W x and W s, the induced electromotive force on W d is zero, the zero indicator is zero, and the current comparator is in a balanced state.
7. The GIS basin-insulator dielectric loss testing device of claim 6, wherein in the current comparator bridge, C x is still considered as a series equivalent circuit, the internal resistance of W x、Ws is negligible compared to the impedance of C x、Cs, resulting in:
Ix＝UxjwCx/(1+jwRxCx)
Is＝UjwCs(1+jwRC)/[1+jwR(C+Cs)]
IR＝Is(1+jwRC)＝UjwCs[1+jwR(C+Cs)]
Substituting I x、IR into ampere-turn balance condition W xIx＝WsIR and developing, and separating the real and imaginary parts can obtain:
Cx＝CsWs/Wx
Rx＝R(C+Cs)Wx/(CsWs)
tanδ＝wRxCx＝wR(C+Cs)
the corresponding values when the parallel equivalent circuit represents the sample can be obtained by the method:
tanδ＝1/(wRxCx)＝wR(C+Cs)
Cx＝CsWs/[(1+tan2δ)Wx]＝CsWs/Wx
Bridge accuracy depends on the accuracy of standard element R, C, C s and W s、Wx, W s and W x being the number of turns of the standard arm and measurement arm windings of the current comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410299368.6A CN118191431A (en) | 2024-03-15 | 2024-03-15 | Dielectric loss testing device for GIS basin-type insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410299368.6A CN118191431A (en) | 2024-03-15 | 2024-03-15 | Dielectric loss testing device for GIS basin-type insulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118191431A true CN118191431A (en) | 2024-06-14 |
Family
ID=91409535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410299368.6A Pending CN118191431A (en) | 2024-03-15 | 2024-03-15 | Dielectric loss testing device for GIS basin-type insulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118191431A (en) |
-
2024
- 2024-03-15 CN CN202410299368.6A patent/CN118191431A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Liu et al. | A study of the sweep frequency impedance method and its application in the detection of internal winding short circuit faults in power transformers | |
| Bartnikas | Partial discharges. Their mechanism, detection and measurement | |
| US7847543B2 (en) | Precision flexible current sensor | |
| CN102044863A (en) | Electrical switching apparatus including a plurality of rogowski coils and method of calibrating the same | |
| Nanyan et al. | The rogowski coil sensor in high current application: A review | |
| CN206804718U (en) | Solid compound inslation shield type voltage transformer based on coaxial capacitance | |
| CN102751081A (en) | Flexible coil current transformer and production method thereof | |
| CN111880123B (en) | Method for detecting frequency response signal of transformer winding resisting power frequency magnetic saturation | |
| CN202796412U (en) | Flexibility coil current transformer | |
| CN118191431A (en) | Dielectric loss testing device for GIS basin-type insulator | |
| CN213517514U (en) | Reactor turn-to-turn insulation detection sensor and reactor turn-to-turn insulation detection device | |
| Rahim et al. | Partial Discharge Detection using Developed Low-cost High Frequency Current Transformer | |
| CN114720747A (en) | Device and method for measuring resistive current of lightning arrester | |
| CN106970325B (en) | Generator handbag insulation reverse wiring inspection device and method for high potential measurement | |
| Sandler et al. | Rogowski coil design for the measurement of high voltage harmonics | |
| Goodeve et al. | Experience with compact epoxy-mica capacitors for rotating machine partial discharge detection | |
| RU2340905C1 (en) | Measuring current transformer for dc machine sparking indication devices | |
| US11617269B2 (en) | Current measuring device for an electric power protection system | |
| CN114019288A (en) | GIS basin-type insulator aging test method | |
| CN219039203U (en) | Anti-electromagnetic interference rogowski coil current sensor | |
| Sandler et al. | Measurement Systems for High Voltage Transients in Power Networks | |
| CN219800651U (en) | Current transformer | |
| CN219915755U (en) | Segmented rogowski coil and crimping type current distribution detection device for power electronic device | |
| CN212693958U (en) | Hall chip aging testing device | |
| CN217333827U (en) | Test measurement and control integrated test transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |