CN107748295B - Device and method for testing dielectric loss of GIS basin-type insulator - Google Patents
Device and method for testing dielectric loss of GIS basin-type insulator Download PDFInfo
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- CN107748295B CN107748295B CN201711268588.9A CN201711268588A CN107748295B CN 107748295 B CN107748295 B CN 107748295B CN 201711268588 A CN201711268588 A CN 201711268588A CN 107748295 B CN107748295 B CN 107748295B
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
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Abstract
The invention provides a device and a method for testing dielectric loss of a GIS basin-type insulator, wherein the device comprises a high-voltage bridge, a high-voltage power supply, a standard capacitor and an insulator testing tool; the insulator testing tool is provided with a tested basin-type insulator to be subjected to dielectric loss testing; the above devices are connected according to the high voltage bridge principle; the bottom of insulator test fixture is provided with movable base, is provided with glass cylindricality on the movable base, and glass cylindricality passes through glass steel threaded rod and connects the basin-type insulator that is surveyed. According to the invention, through the four movable glass fiber reinforced plastic bases, the movable glass fiber reinforced plastic bases can be connected with the threaded holes uniformly distributed on the basin-type insulator, so that stray capacitance of a tested sample is effectively fixed, and the movable base is provided, so that basin-type insulators with different sizes can be met, and the technical problem that the conventional testing device cannot test dielectric loss of basin-type insulators with different voltage levels in GIS can be solved.
Description
Technical Field
The invention relates to the technical field of insulator dielectric loss testing, in particular to a device and a method for testing dielectric loss of a GIS basin-type insulator.
Background
The fully-enclosed combined electrical apparatus (GIS) is an important device in the power system, and the reliable operation of the basin-type insulator is a necessary condition for the normal operation of the GIS. At present, in the field high-voltage dielectric loss test of the GIS basin-type insulator, no related method is used for conducting a dielectric loss test for evaluating the insulation state of the basin-type insulator. Therefore, the device for dielectric loss test of the basin-type insulator in GIS service of the transformer substation is not used in the GIS full-size basin-type insulator aging test at present. It is necessary to study a GIS basin-type insulator dielectric loss test system to conduct dielectric loss test of 10kV and above. The dielectric loss testing method disclosed in the Chinese patent invention (application number: 201010105310, application date: 2010.02.04) is mainly applicable to a testing system used in the field of the field high-voltage dielectric loss testing work of the current 220kV capacitance test product, but cannot be applied to the aging test of full-size basin-type insulators with different voltage grades of GIS and the field dielectric loss test of the basin-type insulators in service of the GIS of the transformer substation.
Therefore, the conventional testing device cannot perform dielectric loss test on basin-type insulators with different sizes and different voltage levels in the GIS, which is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention provides a device and a method for dielectric loss test of a GIS basin-type insulator, which are used for solving the technical problem that the conventional test device cannot test dielectric loss of basin-type insulators with different sizes and different voltage levels in a GIS.
The invention provides a dielectric loss testing device for a GIS basin-type insulator, which comprises a high-voltage bridge, a high-voltage power supply, a standard capacitor and an insulator testing tool, wherein the high-voltage power supply is connected with the standard capacitor;
the insulator testing tool is provided with a tested basin-type insulator to be subjected to dielectric loss testing;
the high-voltage bridge, the high-voltage power supply, the standard capacitor and the tested basin-type insulator on the insulator testing tool are connected according to a high-voltage bridge principle;
the bottom of insulator test fixture is provided with movable base be provided with glass cylindricality on the movable base, glass cylindricality passes through the glass steel threaded rod and connects the basin-type insulator that is surveyed.
Preferably, the method comprises the steps of,
the outer surface of the tested basin-type insulator is wrapped with a layer of metal steel sheet, and a wiring port is arranged on the metal steel sheet;
the wiring port comprises a high-voltage line measuring end and a low-voltage line measuring end;
the low-voltage wire measuring end is connected with a metal electrode of the measured basin-type insulator;
and the high-voltage wire measuring end is connected with the central conductor of the measured basin-type insulator.
Preferably, the high-voltage bridge, the high-voltage power supply, the standard capacitor and the measured basin-type insulator on the insulator testing tool are connected according to a high-voltage bridge principle, and specifically include:
the high-voltage wire measuring end on the measured basin-type insulator is connected with the high-voltage power supply through a high-voltage wire;
the low-voltage wire measuring end on the measured basin-type insulator is connected with the high-voltage bridge through a measuring output wire;
the high voltage power supply and the high voltage bridge are also connected through the standard capacitor.
Preferably, the high-voltage wire is a high-voltage core wire, a high-voltage shielding layer and a high-voltage outer insulating layer from the inner layer to the outer layer.
Preferably, the apparatus further comprises a multi-winding toroidal transformer;
one end of the primary of the multi-winding annular transformer is connected with the low-voltage wire measuring end on the measured basin-type insulator, and the other end of the primary of the multi-winding annular transformer is connected with a grounding point;
one end of the secondary of the multi-winding annular transformer is connected with the high-voltage bridge, and the other end of the secondary of the multi-winding annular transformer is connected with the grounding point;
the multi-winding annular transformer is provided with a detection winding, and the detection winding is connected with a voltage detector.
Preferably, the shell of the insulator testing tool is sealed, and an opening for the measurement wire to be connected is formed in the shell;
the shell is also provided with an air exhaust pipeline which is connected with a vacuum pump;
four pulleys are arranged at four corners of the bottom of the shell.
Preferably, the high-voltage bridge, the high-voltage power supply, the standard capacitor and the shell of the insulator test fixture are all grounded.
Preferably, the housing is in particular a stainless steel housing.
Preferably, the shell is also provided with a tooling front door made of cold-rolled thin steel plates;
the tool front door is provided with a transparent glass window, and the tool front door is also provided with a temperature and humidity meter, a vacuum valve and a pointer type vacuum meter;
and a door handle is further arranged on the tooling front door.
Preferably, a front door sealing strip made of heat-resistant rubber materials is arranged between the tool front door and the shell.
The invention provides a method for testing dielectric loss of a GIS basin-type insulator, which is based on the device for testing dielectric loss of the GIS basin-type insulator and comprises the following steps:
detecting the temperature and the humidity of the insulator testing tool, judging whether the temperature and the humidity of the insulator testing tool meet a preset threshold range, if so, entering the next step;
vacuumizing or not vacuumizing the insulator test tool according to a preset vacuumizing selection signal;
detecting whether the high-voltage bridge, the high-voltage power supply, the standard capacitor and the shell of the insulator test fixture are all effectively grounded;
switching the sensitivity switches of the high-voltage bridge and the high-voltage power supply back to zero;
starting a high-voltage bridge and a high-voltage power supply to perform dielectric loss test on a preset standard sample to obtain stray capacitance C of the device 1 ；
Moving a movable base on an insulator test tool to a position corresponding to the size of the tested basin-type insulator according to the voltage class and the size of the tested basin-type insulator, installing the tested basin-type insulator on the insulator test tool, and connecting corresponding test wires;
setting an insulator test fixture as an environment temperature and humidity condition specified by a standard, standing a tested basin-type insulator for 24 hours to assimilate the tested basin-type insulator with the surrounding environment, and simultaneously keeping the cleanliness of the surface of the tested basin-type insulator;
capacitance C of basin-type insulator to be tested 2 ；
Capacitance C of basin-type insulator to be tested 2 Subtracting stray capacitance C of device 1 And obtaining the real capacitance value of the measured basin-type insulator, so as to obtain the real dielectric loss value of the measured basin-type insulator by calculation.
From the above technical scheme, the invention has the following advantages:
the invention provides a dielectric loss testing device for a GIS basin-type insulator, which comprises a high-voltage bridge, a high-voltage power supply, a standard capacitor and an insulator testing tool, wherein the high-voltage power supply is connected with the standard capacitor; the insulator testing tool is provided with a tested basin-type insulator to be subjected to dielectric loss testing; the high-voltage bridge, the high-voltage power supply, the standard capacitor and the tested basin-type insulator on the insulator testing tool are connected according to a high-voltage bridge principle; the bottom of insulator test fixture is provided with movable base be provided with glass cylindricality on the movable base, glass cylindricality passes through the glass steel threaded rod and connects the basin-type insulator that is surveyed. According to the invention, through the four movable glass fiber reinforced plastic bases, the movable glass fiber reinforced plastic bases can be connected with threaded holes uniformly distributed on the basin-type insulator, so that the functions of supporting the weight of the basin-type insulator and fixing a tested sample are achieved, stray capacitance of the tested sample is effectively fixed, and the movable base is provided, so that basin-type insulators with different sizes can be met, the application range is wide, and the technical problem that the conventional testing device cannot test dielectric loss of basin-type insulators with different sizes and different voltage levels in a GIS is solved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a device for dielectric loss test of a GIS basin-type insulator provided by the invention;
FIG. 2 is a schematic diagram of dielectric loss test of a GIS basin-type insulator provided by the invention;
FIG. 3 is a bridge wiring diagram of dielectric loss test of a GIS basin-type insulator provided by the invention;
fig. 4 is a schematic flow chart of dielectric loss test of a GIS basin-type insulator provided by the invention;
FIG. 5 is a front door distribution diagram of a device for dielectric loss test of a GIS basin-type insulator provided by the invention;
wherein: 1, a high-voltage bridge; 2 high voltage power supply; 3 standard capacitance; 4, measuring an output line; 5, measuring a high-voltage line; 6, testing the tool for the full-size insulator; 7, a high-voltage core wire, a high-voltage shield and high-voltage external insulation; 8, a measured basin-type insulator; 9, a glass fiber reinforced plastic threaded rod; 10 a metal electrode; a movable support; 12 vacuum valve; 13 vacuum gauge; 14, warm and humid table; 15 door handles; a 16 pane window; 17 roller.
Detailed Description
The invention provides a device and a method for dielectric loss test of a GIS basin-type insulator, which are used for solving the technical problem that the conventional test device cannot test dielectric loss of basin-type insulators with different sizes and different voltage levels in a GIS.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of a device for testing dielectric loss of a GIS basin-type insulator provided by the present invention includes a high-voltage bridge 1, a high-voltage power supply 2, a reference capacitor 3 and an insulator testing tool 6;
the insulator testing tool 6 is provided with a tested basin-type insulator 8 to be subjected to dielectric loss test;
the high-voltage bridge 1, the high-voltage power supply 2, the standard capacitor 3 and the tested basin-type insulator 8 on the full-size insulator test tool 6 are connected according to the principle of the high-voltage bridge 1;
the bottom of full-size insulator test fixture 6 is provided with movable base 11, is provided with glass cylindricality on the movable base 11, and glass cylindricality passes through glass steel threaded rod 9 and connects by test basin-type insulator 8.
The invention can be connected with the threaded holes uniformly distributed on the basin-type insulator through the four movable glass fiber reinforced plastic bases, plays the roles of supporting the weight of the basin-type insulator and fixing the tested sample, effectively fixes the stray capacitance of the tested sample, and has the movable base 11, thereby being capable of meeting the basin-type insulators with different sizes, having wide application range and solving the technical problem that the traditional testing device can not test the dielectric loss of the basin-type insulators with different sizes and different voltage levels in the GIS.
Further, the method comprises the steps of,
the outer surface of the measured basin-type insulator 8 is wrapped with a layer of metal steel sheet, and a wiring port is arranged on the metal steel sheet;
the wiring port comprises a high-voltage line measuring end and a low-voltage line measuring end;
the low-voltage wire measuring end is connected with a metal electrode 10 of the measured basin-type insulator 8;
the high-voltage wire measuring end is connected with the center conductor of the measured basin-type insulator 8.
Further, the high voltage bridge 1, the high voltage power supply 2, the standard capacitor 3 and the basin-type insulator 8 to be tested on the full-size insulator test fixture 6 are connected specifically according to the principle of the high voltage bridge 1, and the connection specifically comprises:
the high-voltage wire measuring end on the measured basin-type insulator 8 is connected with the high-voltage power supply 2 through the high-voltage wire 5;
the low-voltage wire measuring end on the measured basin-type insulator 8 is connected with the high-voltage bridge 1 through a measuring output wire 4;
the high voltage power supply 2 and the high voltage bridge 1 are also connected via a standard capacitor 3.
Further, the transformer also comprises a multi-winding toroidal transformer;
one end of the primary of the multi-winding annular transformer is connected with a low-voltage line measuring end on the measured basin-type insulator 8, and the other end is connected with a grounding point;
one end of the secondary of the multi-winding annular transformer is connected with the high-voltage bridge 1, and the other end is connected with a grounding point; the connection between the secondary and the high-voltage bridge 1 may be a litz wire.
The multi-winding annular transformer is provided with a detection winding, and the detection winding is connected with a voltage detector.
Further, the high voltage wire 5 is measured to be a high voltage core wire, a high voltage shielding layer, and a high voltage outer insulating layer 7 in this order from the inner layer to the outer layer. Such a wire may be a stranded wire. In fig. 1, the combination of the high-voltage core wire, the high-voltage shielding layer and the high-voltage outer insulating layer is denoted by reference numeral 7, and the inside of a circle frame at 7 in the drawing is a partial perspective showing the internal structure, so that the high-voltage wire is actually measured well and the inner-layer wire is not exposed.
Further, the shell of the full-size insulator testing tool 6 is sealed, and an opening for the measurement wire to be connected is formed in the shell;
the shell is also provided with an air exhaust pipeline which is connected with a vacuum pump;
four rollers 17 are arranged at four corners of the bottom of the shell.
The full-size insulator test fixture 6 has good air tightness of the shell, and good sealing treatment is carried out on the open hole although the open hole is formed, and the sealing glue is coated or the sealing strip is sealed.
Further, the high-voltage bridge 1, the high-voltage power supply 2, the standard capacitor 3 and the shell of the full-size insulator test fixture 6 are all grounded.
Further, the housing is specifically a stainless steel housing.
Further, the outer shell is also provided with a tool front door made of cold-rolled thin steel plates;
the tool main door is provided with a transparent glass window 16, and is also provided with a hygrothermograph, a vacuum valve 12 and a pointer type vacuum meter 13;
the tooling front door is also provided with a door handle 15.
Further, a front door sealing strip made of heat-resistant rubber materials is arranged between the front door of the tool and the shell.
The device for testing dielectric loss of the GIS basin-type insulator provided by the invention is described in detail below with reference to fig. 1:
dielectric loss testing device of GIS basin-type insulator: the method is suitable for field test of dielectric loss of insulators in GIS basin-type insulator aging tests and GIS service of transformer substations. The full-size insulator test fixture 6 comprises a test power supply, a standard capacitor 3, a high-voltage bridge 1 and a full-size insulator test fixture for controlling the environmental condition of the tested basin-type insulator 8, and is used for fixing the stray capacitance of the environment; four movable bases are placed at the bottom of the full-size insulator testing tool 6; the base can be fixed with a glass fiber reinforced plastic cylinder; the glass fiber reinforced plastic cylinder body can be used for supporting the basin-shaped insulator 8 to be tested; the periphery of the basin-type insulator is tightly wrapped with a layer of metal steel sheet, and a port connected with a measuring line is formed in the metal steel sheet; the upper side and the right side metal surface of the full-size insulator testing tool 6 are provided with openings, and high-voltage wires and measuring wires are connected;
the full-size insulator test fixture 6 is right-angled, the middle is a transparent glass window 16, and the test condition can be observed from the outside; the pointer type vacuum meter 13 and the vacuum valve 12 are distributed on the left side of the front door of the full-size insulator testing tool 6; the back of the full-size insulator testing tool 6 is provided with an air exhaust pipeline which can be connected with a vacuum pump for vacuumizing; the right side of the front door of the full-size insulator testing tool 6 is provided with a temperature and humidity meter, so that the temperature can be monitored in real time. The material of the full-size insulator test fixture 6 is stainless steel material. The full-size insulator test fixture 6 is airtight. The sealing strip of the front door of the full-size insulator testing tool 6 is made of heat-resistant rubber materials. The whole-size insulator testing tool 6 is made of high-quality cold rolled steel plates, and is surface plastic-sprayed.
Four rollers 17 are distributed at four corners of the bottom of the full-size insulator testing tool 6, so that the full-size insulator testing tool 6 can be moved conveniently.
Full-size insulator test fixture 6 shell, standard lossless capacitor, high-voltage bridge 1, high-voltage power supply 2 all carry out the ground connection, effectively realize fixed basin insulator stray capacitance's effect.
The high voltage is connected with the center conductor of the basin-type insulator 8 to be tested.
The high voltage wire comprises a high voltage core wire, a high voltage shield and an external insulation wrapping the high voltage wire.
The low-voltage testing end is connected with the basin-type insulator 8 to be tested and the high-voltage bridge 1.
The output end of the standard lossless capacitor is connected to the high-voltage bridge 1.
As shown in FIG. 1, the connection of the GIS basin-type insulator dielectric loss test system comprises that one end of a standard capacitor 3 is connected with a high-voltage power supply 2, one end of a tested basin-type insulator 8 is connected with a high-voltage power supply 2, and one end of a tested basin-type insulator 8 is connected with a high-voltage power supply 11; the measurement output line 4 and the measurement high-voltage line 5 are respectively connected with two ends of the measured basin-type insulator 8, and in addition, the high-voltage power supply 2, the high-voltage bridge 1 and the standard capacitor 3 are effectively grounded. The inner structure of full-size insulator test fixture 6 includes four mobilizable glass steel bases of fixed glass steel pillar, can be connected with evenly distributed's screw hole on the basin insulator, plays the effect of supporting basin insulator's weight and fixed test sample, the effectual stray capacitance who has fixed the test sample. In addition, in fig. 1, the five interfaces of the high-voltage bridge 1 are sequentially a grounding end, a CxI end, a CxP end, a Cs end and a grounding end, the CxI end is connected with the secondary of the multi-winding ring transformer, the CxP end is connected with the low-voltage line measuring end of the measured basin-type insulator 8, the Cs end is connected with the standard capacitor 3, n1 of the transformer is the primary, and n2 is the secondary in fig. 1.
The principle of the invention is described below with reference to fig. 2:
in the embodiment of the invention, the dielectric loss testing principle of the GIS basin-type insulator mainly adopts the principle of a current comparator, so that the GIS basin-type insulator has higher ratio precision and stability in measurement, and cannot be achieved by a general bridge.
As shown in fig. 2, a current comparator bridge schematic is shown, which is a multi-winding toroidal transformer. I from the same power supply 1 、I 2 And Nx and Ns windings respectively generate magnetic flux correspondingly in the iron core, when the ampere turns of the two windings are equal and the directions are opposite, the total magnetic flux in the iron core is zero, no induced potential exists in the detection winding ND at this time, a high-sensitivity detector detects the induced potential, the induced potential is zero, and the detector gauge head is zero.
At voltages above 100V, capacitance and tg delta are typically measured using a classical high voltage xilin bridge. The accuracy of its measurement is essentially related to the accuracy of the ratio of the two resistances of the low voltage part, while the accuracy of the "tg delta" measurement is related to the time constants of the two resistances, and it is quite difficult to keep the time constants equal between them if a large resistance ratio is required for a small-capacity standard capacitor to be compared with a large-capacity capacitor on a xilin bridge.
The current comparator capacitor bridge replaces the resistance ratio with the turns ratio, and has a fairly stable 10 -5 Accuracy of the order of magnitude, at ratios up to 1000: this accuracy is maintained at 1.
When measuring a large capacitance, the impedance of the capacitor is small, and therefore the wiring impedance cannot be neglected. Standard capacitorThe wiring impedance of the device is 1 x 10 lower than the standard capacitor impedance -7 The internal impedance of the current comparator winding is then a few parts per million of the standard capacitor impedance. In order to ensure measurement accuracy when measuring large volumes, the lead impedance must be compensated. The connection method is shown in fig. 3, cs is a standard capacitance 3, and Cx is an equivalent capacitance of the measured basin-type insulator 8. The current of the tested capacitor is connected with the primary of a current transformer (multi-winding ring transformer), the other end of the tested capacitor is connected with the ground, the secondary of the CT is connected with a CxI socket and a ground button of the bridge, a stranded wire or a coaxial wire can be adopted for reducing the influence of mutual inductance, the high-voltage potential of the tested capacitor is connected with the high-voltage end of a standard capacitor, the low-voltage end of the tested capacitor is connected with a Cxp socket of the bridge, and note that the primary and the secondary of the external CT are introduced by the same-phase end, otherwise, the bridge cannot be balanced.
As shown in FIG. 4, the test flow of the invention can directly display the capacitance and the loss tangent value tg delta of the tested sample by applying voltage to the tested sample and the standard capacitor 3, and the bridge can be matched with various high-voltage standard capacitors 3 to form a high-voltage capacitor bridge, thereby achieving the test purpose.
As shown in fig. 5, the distribution diagram of the front door of the full-size insulator test fixture 6 is shown, the pointer type vacuum gauge 13 is arranged on the left side, so that the vacuum degree in the fixture can be simply and intuitively seen, and when the vacuum valve 12 is opened, the vacuum tube behind the vacuum pump connecting box can be vacuumized, and the operation is simple; the temperature and humidity meter 14 on the right can monitor and display the temperature and humidity in the box body, the glass window 16 in the middle can still observe the testing condition after the full-size insulator testing tool 6 is closed, and the box is simple and attractive.
An embodiment of a method for dielectric loss testing of a GIS basin-type insulator provided by the present invention will be described in detail below.
The embodiment of the method for testing the dielectric loss of the GIS basin-type insulator provided by the invention is based on the device for testing the dielectric loss of the GIS basin-type insulator, and comprises the following steps:
detecting the temperature and the humidity of the insulator testing tool, judging whether the temperature and the humidity of the insulator testing tool meet a preset threshold range, if so, entering the next step;
vacuumizing or not vacuumizing the insulator test tool according to a preset vacuumizing selection signal;
detecting whether the high-voltage bridge, the high-voltage power supply, the standard capacitor and the shell of the insulator test fixture are all effectively grounded;
switching the sensitivity switches of the high-voltage bridge and the high-voltage power supply back to zero;
starting a high-voltage bridge and a high-voltage power supply to perform dielectric loss test on a preset standard sample to obtain stray capacitance C of the device 1 ；
Moving a movable base on an insulator test tool to a position corresponding to the size of the tested basin-type insulator according to the voltage class and the size of the tested basin-type insulator, installing the tested basin-type insulator on the insulator test tool, and connecting corresponding test wires;
setting an insulator test fixture as an environment temperature and humidity condition specified by a standard, standing a tested basin-type insulator for 24 hours to assimilate the tested basin-type insulator with the surrounding environment, and simultaneously keeping the cleanliness of the surface of the tested basin-type insulator;
capacitance C of basin-type insulator to be tested 2 ；
Capacitance C of basin-type insulator to be tested 2 Subtracting stray capacitance C of device 1 And obtaining the real capacitance value of the measured basin-type insulator, so as to obtain the real dielectric loss value of the measured basin-type insulator by calculation.
The following needs to be noted:
(1) Before testing, firstly, the tested sample is subjected to homogenization for 24 hours under the environmental temperature and humidity conditions specified by the standard, and secondly, the cleanliness of the surface of the tested sample is ensured.
(2) The temperature and humidity in the box body are monitored by using a temperature and humidity meter configured by a full-size insulator test tool, and if the humidity is too high, the box body is required to be subjected to forced air drying by using a forced air dryer.
(3) If testing in a vacuum environment is required, vacuum is prepared in advance.
(4) When the high-voltage wire and the measuring end are connected with the metal conductor, whether the connection is tight or not needs to be checked.
(5) At the beginning of the test, it is checked whether the high voltage power supply, the standard capacitor, the high voltage bridge, and the full-size insulator test fixture housing are effectively grounded.
(6) When high voltage is applied, care is taken to guard against.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The device for testing dielectric loss of the GIS basin-type insulator is characterized by comprising a high-voltage bridge, a high-voltage power supply, a standard capacitor and an insulator testing tool;
the insulator testing tool is provided with a tested basin-type insulator to be subjected to dielectric loss testing;
the high-voltage bridge, the high-voltage power supply, the standard capacitor and the tested basin-type insulator on the insulator testing tool are connected according to a high-voltage bridge principle;
a movable supporting piece is arranged at the bottom of the insulator testing tool, a glass fiber reinforced plastic cylindrical body is fixed on the movable supporting piece, and the glass fiber reinforced plastic cylindrical body is used for supporting the basin-shaped insulator to be tested;
the outer surface of the tested basin-type insulator is wrapped with a layer of metal steel sheet, and a wiring port is arranged on the metal steel sheet;
the wiring port comprises a high-voltage line measuring end and a low-voltage line measuring end;
the low-voltage wire measuring end is connected with a metal electrode of the measured basin-type insulator;
the high-voltage wire measuring end is connected with the central conductor of the measured basin-type insulator;
the high-voltage bridge comprises a grounding end, a CxI end, a CxP end and a Cs end;
the high-voltage bridge, the high-voltage power supply, the standard capacitor and the tested basin-type insulator on the insulator testing tool are connected according to the high-voltage bridge principle, and specifically comprise:
the high-voltage wire measuring end on the measured basin-type insulator is connected with the high-voltage power supply through a high-voltage wire;
the low-voltage wire measuring end on the measured basin-type insulator is connected with the CxP end of the high-voltage bridge through a measuring output wire;
the Cs end of the high-voltage power supply and the Cs end of the high-voltage bridge are also connected through the standard capacitor;
the transformer also comprises a multi-winding toroidal transformer;
one end of the primary of the multi-winding annular transformer is connected with the low-voltage wire measuring end on the measured basin-type insulator, and the other end of the primary of the multi-winding annular transformer is connected with a grounding point;
one end of the secondary of the multi-winding annular transformer is connected with the CxI end of the high-voltage bridge, and the other end of the secondary of the multi-winding annular transformer is connected with the grounding point;
the other end of the secondary of the multi-winding annular transformer is also connected with the grounding end of the high-voltage bridge;
the multi-winding annular transformer is provided with a detection winding, and the detection winding is connected with a voltage detector.
2. The device for testing dielectric loss of a GIS basin-type insulator according to claim 1, wherein the high voltage wire is a high voltage core wire, a high voltage shielding layer and a high voltage outer insulating layer from an inner layer to an outer layer.
3. The device for testing dielectric loss of GIS basin-type insulator according to claim 1, wherein the shell of the insulator testing fixture is sealed, and an opening for the measurement wire to be connected is arranged on the shell;
the shell is also provided with an air exhaust pipeline which is connected with a vacuum pump;
four pulleys are arranged at four corners of the bottom of the shell.
4. The device for testing dielectric loss of a GIS basin-type insulator according to claim 3, wherein the high voltage bridge, the high voltage power supply, the standard capacitor and the housing of the insulator testing fixture are all grounded.
5. The device for testing dielectric loss of GIS basin-type insulator according to claim 3, wherein the outer shell is further provided with a tooling front door made of cold-rolled thin steel plates;
the tool front door is provided with a transparent glass window, and the tool front door is also provided with a temperature and humidity meter, a vacuum valve and a pointer type vacuum meter;
and a door handle is further arranged on the tooling front door.
6. The device for testing dielectric loss of the GIS basin-type insulator according to claim 5, wherein a front door sealing strip made of heat-resistant rubber materials is arranged between the tool front door and the shell.
7. A method for testing dielectric loss of a GIS basin-type insulator, based on a GIS basin-type insulator dielectric loss testing apparatus according to any one of claims 1 to 6, comprising:
detecting the temperature and the humidity of the insulator testing tool, judging whether the temperature and the humidity of the insulator testing tool meet a preset threshold range, if so, entering the next step;
vacuumizing or not vacuumizing the insulator test tool according to a preset vacuumizing selection signal;
detecting whether the high-voltage bridge, the high-voltage power supply, the standard capacitor and the shell of the insulator test fixture are all effectively grounded;
switching the sensitivity switches of the high-voltage bridge and the high-voltage power supply back to zero;
starting a high-voltage bridge and a high-voltage power supply to presetDielectric loss test is carried out on a standard sample of the device to obtain stray capacitance C of the device 1 ；
Moving a movable supporting piece on an insulator test tool to a position corresponding to the size of the tested basin-type insulator according to the voltage grade and the size of the tested basin-type insulator, installing the tested basin-type insulator on the insulator test tool, and connecting corresponding test wires;
setting an insulator test fixture as an environment temperature and humidity condition specified by a standard, standing a tested basin-type insulator for 24 hours to assimilate the tested basin-type insulator with the surrounding environment, and simultaneously keeping the cleanliness of the surface of the tested basin-type insulator;
capacitance C of basin-type insulator to be tested 2 ；
Capacitance C of basin-type insulator to be tested 2 Subtracting stray capacitance C of device 1 And obtaining the real capacitance value of the measured basin-type insulator, so as to obtain the real dielectric loss value of the measured basin-type insulator by calculation.
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| CN111381106A (en) * | 2018-12-28 | 2020-07-07 | 上海国缆检测中心有限公司 | Cable testing circuit, method, terminal and medium based on penicillin bridge |
| CN111722063B (en) * | 2020-07-24 | 2024-06-28 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | On-line monitoring device and method for condensation of common-box bus post insulators of power plant |
| CN113376052A (en) * | 2021-05-20 | 2021-09-10 | 贵州电网有限责任公司 | Composite insulator core rod performance evaluation method |
| CN114019288A (en) * | 2021-11-09 | 2022-02-08 | 国网河南省电力公司济源供电公司 | GIS basin-type insulator aging test method |
| CN117192224B (en) * | 2023-09-28 | 2024-02-20 | 武汉朗德电气有限公司 | GIS basin-type insulator dielectric loss testing device |
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