CN110632453A - Test transformer, combined electrical apparatus and cable combined type connecting equipment and test method thereof - Google Patents
Test transformer, combined electrical apparatus and cable combined type connecting equipment and test method thereof Download PDFInfo
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- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 239000002131 composite material Substances 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The invention relates to the technical field of high-voltage power equipment detection, in particular to a test method for testing a transformer, a combined electrical appliance and a cable combined type connecting device. The transformer is connected with the GIS, and the GIS and the transformer are connected at a grounding short circuit row of a grounding switch closest to the transformer; the circuit breaker CB and the grounding switch short-circuit row are matched with each other to realize disconnection or switching-on; the grounding switch is suspended to the side of the grounding short-circuit bar away from the grounding switch; the grounding switch is switched on during testing, and after the testing instrument is connected, the whole testing loop is closed; the simulation analysis is used for diagnosing whether the transformer winding is deformed or not by establishing a circuit model and analyzing the change of the frequency response characteristic curve of the winding before and after the transformer fault; after each parameter is given to an initial value, the influence degree of each parameter change on a final result is obtained by singly changing the corresponding coefficient each time. The problems that the connecting equipment needs to be dismantled before the field equipment test and the like are avoided, and the method has high application value and is suitable for popularization and application.
Description
Technical Field
The invention relates to the technical field of high-voltage power equipment detection, in particular to a device for testing the composite connection of a transformer, a combined electrical appliance and a cable and a test method thereof.
Background
High-voltage power equipment such as power transformers, circuit breakers, transformers and the like are common key equipment in substations, and the type selection and arrangement of the high-voltage power equipment in the substations need to meet the requirements of relevant standards. In addition to the requirement of self insulation strength, the space between equipment and personnel and machinery is considered to be kept enough safe distance, and the occupied area of the substation for arranging outdoor open equipment is very large.
With the increase of power consumption and the development of power grids, the capacity of related equipment in a transformer substation needs to be continuously increased, the volume, the insulation thickness, the safety distance and the like of the related equipment are increased, the land resources for constructing the transformer substation are more and more tense, and national power systems all face the same problem, namely the land acquisition difficulty of transformer substation construction, especially in the edge areas of urban areas or urban areas. Therefore, the miniaturization and the intellectualization of the construction of the transformer substation are the inevitable trend of development.
At present, the composite connection of a power transformer, a closed type combined electrical apparatus GIS and a power cable is widely used in each transformer substation of a power system, and the connection has the advantages of reliable operation, small occupied area, small maintenance workload and the like. The field transformer, the closed combined electrical apparatus and the cable mainly have 4 special connection modes: the transformer is directly connected with the closed combined electrical apparatus; the closed combined electrical appliance is directly connected with the cable; the transformer is directly connected with the closed combined electrical apparatus, and the closed combined electrical apparatus is led out through a cable; the transformer is directly connected with the cable. Due to the diversification of the connection mode of the transformer and the closed combined electrical appliance and the implementation of the independent test standards of the transformer, the closed combined electrical appliance and the cable, great difficulty is caused to the field test. The field test generally adopts the transformer, the combined electrical apparatus and the cable to respectively carry out the field test according to respective test standards, and then the connection is carried out. This test method has the following problems:
(1) individual test items are not well developed, and test sleeves are required to be additionally arranged in part of tests, so that the installation workload is increased;
(2) the test is not carried out after the connection, so that the connection quality cannot be checked, and potential safety hazards are caused to the operation of equipment;
(3) if no longer test after connecting, will unable acquire whole test data, can't provide accurate primary data in the overhaul of the equipments afterwards, be unfavorable for equipment state to judge.
However, after the above devices are connected, the joints between the parts are completely located in the sealed space, and many test items cannot be developed, for example: the method comprises the following steps of transformer winding deformation test, dielectric loss test, direct current resistance test, insulation resistance test, cable voltage withstand test, switch equipment voltage withstand test and the like. Even if the test is carried out through the positions of the grounding switch and the like, the test method, whether the test result is influenced by the connecting part, the test criterion and the like are still in blank areas.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a device and a method for testing the composite connection between a transformer and a combined electrical appliance and a cable. The method aims to provide a feasible method under the condition of the combined connection of the transformer, the closed combined electrical appliance and the cable, so that the relevant test operation under the special connection mode of the transformer, the closed combined electrical appliance and the cable is standardized, and testers can ensure the test quality, reduce the test time and improve the test efficiency.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
testing the transformer and combined electrical appliance and cable combined type connecting equipment: the GIS is connected with a transformer, and the circuit breaker CB and the grounding short-circuit row of the grounding switch are mutually matched to realize the disconnection or the switch-on of the section of the circuit; the grounding switch is in a closing state during testing, and after the connection of the testing equipment is completed, the loop of the whole testing equipment is closed.
And the GIS and the transformer are connected with the ground short-circuit row by adopting the grounding switch of the grounding switch closest to the transformer.
One side of the grounding switch opposite to the ground short-circuit bar, which is far away from the grounding switch, is disconnected, and the grounding switch is kept in a suspended state; the grounding switch is a test terminal to the grounding short-circuit bar, and the grounding switch is in a closing state during testing.
And the outlet cylinder and the outlet wire of the GIS are connected with the transformer sleeve and the outlet wire through the internal outlet wire.
The test method for testing the transformer, the combined electrical apparatus and the cable combined type connecting equipment utilizes the equipment to carry out the test, and comprises the following steps: the simulation analysis is realized by establishing a circuit model, when the frequency is higher than 10kHz, the magnetic conductivity of the transformer iron core is the same as that of air, and a transformer winding is equivalent to a passive linear double-port network consisting of a linear resistor, a capacitor and an inductor; when the winding has deformation fault, the inductance or capacitance in the network changes, the frequency response characteristic curve of the network also changes, and whether the transformer winding deforms or not is diagnosed by analyzing the change of the frequency response characteristic curve of the winding before and after the transformer fault; after each parameter is given to an initial value, the influence degree of each parameter change on a final result is obtained by singly changing the corresponding coefficient, the longitudinal capacitance, the winding inductance and the earth capacitance each time.
The model comprises winding turn-to-turn inductance or inter-cake inductance, longitudinal capacitance, capacitance to ground, dielectric loss between a winding and the ground, dielectric loss between turns or cakes and non-inductive resistance for acquiring output signals.
And the longitudinal capacitor is an inter-turn or inter-cake capacitor.
The networks are represented by frequency response characteristics, one network corresponding to only one frequency response curve.
The small change of the longitudinal capacitance has no influence on the low frequency band before 2MHz, and the small deformation is difficult to judge in the low frequency band; the change of the longitudinal capacitance at the head end and the tail end on a frequency response curve is the same, new resonance points are generated in the middle frequency band, and the correlation coefficient and the mean square error are obviously changed; changing the middle longitudinal capacitance has an influence on the high-frequency section of the frequency response curve, but the change is smaller compared with the change generated at the head end and the tail end; the influence of the increase of the inductance of the winding on a frequency response curve is the same as that of the longitudinal capacitance, the increase of the inductance of the head end and the increase of the inductance of the tail end have larger influence on a middle frequency range, a resonance point is increased, the curve moves towards a low frequency direction, the variation of a correlation coefficient and the mean square error is obvious, and the deformation fault of the winding can be obviously reflected; the middle part inductance changes to influence the high-frequency band frequency response curve, but the change degree is small, and the sensitivity to middle part deformation is not high; the influence of 10% increase of the ground capacitance Cg on the frequency response curve is very small, the frequency response curve shifts to the low-frequency direction only after the middle part of the ground capacitance Cg is increased by 10%, and the related coefficient and the mean square error change are very small; therefore, the influence of the size of the GIS pull rod on the frequency response curve is very small, and deformation test patterns of the windings before and after the combined connection are basically consistent and have no obvious change.
The invention has the advantages and beneficial effects that:
according to the invention, through establishing a transformer winding distributed model and using the PSPICE to perform related simulation, the influence condition of the test parameter change on the test result after composite connection can be obtained, and the correctness of the test method disclosed by the invention is further helped to be verified.
The field experience shows that the transformer, the combined electrical appliance and the cable combined type connecting device can also carry out related routine tests under the condition of not dismantling the connecting part, test data can be used as an initial value and a comparative value of the field device, the problems that the field device cannot be tested or the connecting device needs to be dismantled before the test and the like are avoided, the practical application value is very high, and the method is worthy of large-area popularization and application.
Drawings
In order to facilitate the understanding and practice of the present invention for those of ordinary skill in the art, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and the detailed description, the following examples are provided to illustrate the present invention, but it should be understood that the scope of the present invention is not limited by the detailed description.
FIG. 1 is a schematic diagram of a GIS and transformer connection of the present invention;
FIG. 2 is a test wiring diagram of the grounding switch of the present invention during the measurement of the insulation characteristic of the transformer;
fig. 3 is a diagram of an equivalent circuit network of a transformer winding related to simulation of the present invention.
In the figure: the transformer T, the grounding switch ES1, the grounding switch ES2, the grounding switch ES3, the isolating switch DS1, the isolating switch DS2, the circuit breaker CB, a grounding switch grounding short-circuit row SJ, a winding inductance L, a longitudinal capacitance Cs, a grounding capacitance Cg, a dielectric loss Rg between a winding and the ground, a dielectric loss Rp between turns or cakes, a longitudinal capacitance Cs1, a longitudinal capacitance Cs2 and a longitudinal capacitance Cs3.
Detailed Description
The invention relates to a device and a method for testing the composite connection of a transformer, a combined electrical appliance and a cable, and the device and the method are shown in figures 1 and 2, wherein figure 1 is a schematic diagram of the connection of a GIS and the transformer, and figure 2 is a test wiring for measuring the insulation characteristic of the transformer at a grounding switch. After the equipment is closed, in order to carry out related tests under the condition of not dismantling the connection, the invention adopts a mode of correspondingly connecting the grounding switch of the grounding switch closest to the transformer T to the ground short-circuit row.
In fig. 1, the GIS part is a GIS outlet cylinder and an outlet wire, the transformer part is a transformer bushing and an outlet wire, and the GIS and the transformer are connected as internal connection of the outlet wire.
In fig. 2, the circuit breaker CB and the grounding switch are matched with each other to form a grounding short-circuit bank SJ to disconnect or close the section of line.
During actual test, one side of the grounding switch grounding short-circuit row SJ far away from the grounding switch is detached on site and kept in a suspended state, and the grounding switch grounding short-circuit row SJ serves as a test terminal. And the grounding switch is in a closing state during testing, and the whole testing loop is closed after the connection of the testing instrument is completed.
The simulation analysis is to establish a circuit model by using PSPICE software, when the frequency is higher than 10kHz, the magnetic conductivity of the transformer iron core is almost the same as that of air, and the transformer winding can be equivalent to a passive linear double-port network consisting of a linear resistor, a capacitor and an inductor.
Fig. 3 is a diagram of an equivalent circuit network of a transformer winding according to the present invention, as shown in fig. 3. The model comprises winding turn-to-turn inductance or inter-cake inductance, longitudinal capacitance, capacitance to ground, dielectric loss between a winding and the ground, dielectric loss between turns or cakes, non-inductive resistance for acquiring output signals and the like. In fig. 3, the vertical capacitance Cs1, the vertical capacitance Cs2, and the vertical capacitance Cs3. The winding inductance L may be a winding turn-to-turn inductance or a winding cake-to-cake inductance.
The influence of the composite connecting equipment on the transformer is mainly to increase the capacitance and the resistance of a measuring loop, establish a transformer winding distributed model and perform related simulation by using a PSPICE (power system interface controller) to obtain the influence condition of the test parameter change on the test result after composite connection, thereby helping to verify whether the test method is correct or not.
The network is represented by a frequency response characteristic, and one network corresponds to only one frequency response curve. When the winding has deformation fault, the inductance or capacitance in the network changes, and the frequency response characteristic curve of the network also changes. Whether the transformer winding is deformed or not can be diagnosed by analyzing the change of the frequency response characteristic curve of the winding before and after the transformer fault.
After each parameter is given to an initial value, the influence degree of each parameter change on a final result can be obtained by singly changing the corresponding coefficient, the longitudinal capacitance Cs, the winding inductance L and the earth capacitance Cg each time.
The small change of the longitudinal capacitance Cs has almost no influence on the low frequency band before 2MHz, which shows that the small deformation is difficult to judge in the low frequency band; the change of the longitudinal capacitance Cs at the head end and the tail end on a frequency response curve is the same, new resonance points are generated in the middle frequency band, and the correlation coefficient and the mean square error are obviously changed; changing the middle longitudinal capacitance Cs has an effect on the high frequency band of the frequency response curve, but produces less change than at the beginning and end. The influence of the increase of the inductance L of the winding on a frequency response curve is the same as that of the longitudinal capacitance Cs, the increase of the inductance at the head end and the increase of the inductance at the tail end have larger influence on a middle frequency range, a resonance point is increased, the curve moves towards the low frequency direction, the variation of the correlation coefficient and the mean square error is obvious, and the deformation fault of the winding can be obviously reflected; the middle part inductance changes to influence the high-frequency band frequency response curve, but the change degree is small, and the sensitivity to middle part deformation is not high. The influence of 10% increase of the ground capacitance Cg on the frequency response curve is very small, the frequency response curve shifts to the low frequency direction only after the 10% increase of the middle ground capacitance Cg, but the variation of the correlation coefficient and the mean square error is very small.
Therefore, the GIS pull rod size has very little influence on the frequency response curve, the deformation test maps of the windings before and after the combined connection are basically consistent and have no obvious change, and the method can be applied to the winding deformation test of the frequency response method and accurately judge the state of the transformer winding.
The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and the embodiments may be determined according to the technical solutions and practical situations of the present invention, and any other modifications or other equivalent substitutions that do not depart from the technical solutions of the present invention are included in the scope of the present invention.
Claims (9)
1. Test transformer and combined electrical apparatus, cable combined type jointing equipment, characterized by: the GIS is connected with a transformer, and the circuit breaker CB and the grounding short-circuit row of the grounding switch are mutually matched to realize the disconnection or the switch-on of the section of the circuit; the grounding switch is in a closing state during testing, and after the connection of the testing equipment is completed, the loop of the whole testing equipment is closed.
2. The test transformer and combined electrical apparatus and cable combined type connecting device of claim 1, wherein: and the GIS and the transformer are connected with the ground short-circuit row by adopting the grounding switch of the grounding switch closest to the transformer.
3. The test transformer and combined electrical apparatus and cable combined type connecting device of claim 1, wherein: one side of the grounding switch opposite to the ground short-circuit bar, which is far away from the grounding switch, is disconnected, and the grounding switch is kept in a suspended state; the grounding switch is a test terminal to the grounding short-circuit bar, and the grounding switch is in a closing state during testing.
4. The test transformer and combined electrical apparatus and cable combined type connecting device of claim 1, wherein: and the outlet cylinder and the outlet wire of the GIS are connected with the transformer sleeve and the outlet wire through the internal outlet wire.
5. The test method for testing the transformer, the combined electrical appliance and the cable combined type connecting equipment is characterized by comprising the following steps of: the assay is performed using the apparatus of claims 1-4, comprising: the simulation analysis is realized by establishing a circuit model, when the frequency is higher than 10kHz, the magnetic conductivity of the transformer iron core is the same as that of air, and a transformer winding is equivalent to a passive linear double-port network consisting of a linear resistor, a capacitor and an inductor; when the winding has deformation fault, the inductance or capacitance in the network changes, the frequency response characteristic curve of the network also changes, and whether the transformer winding deforms or not is diagnosed by analyzing the change of the frequency response characteristic curve of the winding before and after the transformer fault; after each parameter is given to an initial value, the influence degree of each parameter change on a final result is obtained by singly changing the corresponding coefficient, the longitudinal capacitance, the winding inductance and the earth capacitance each time.
6. The test method for testing the transformer, the combined electrical appliance and the cable composite type connecting equipment according to claim 5, wherein the test method comprises the following steps: the model comprises winding turn-to-turn inductance or inter-cake inductance, longitudinal capacitance, capacitance to ground, dielectric loss between a winding and the ground, dielectric loss between turns or cakes and non-inductive resistance for acquiring output signals.
7. The test method for testing the transformer, the combined electrical appliance and the cable composite type connecting equipment according to claim 5, wherein the test method comprises the following steps: and the longitudinal capacitor is an inter-turn or inter-cake capacitor.
8. The test method for testing the transformer, the combined electrical appliance and the cable composite type connecting equipment according to claim 5, wherein the test method comprises the following steps: the networks are represented by frequency response characteristics, one network corresponding to only one frequency response curve.
9. The test method for testing the transformer, the combined electrical appliance and the cable composite type connecting equipment according to claim 5, wherein the test method comprises the following steps: the small change of the longitudinal capacitance has no influence on the low frequency band before 2MHz, and the small deformation is difficult to judge in the low frequency band; the change of the longitudinal capacitance at the head end and the tail end on a frequency response curve is the same, new resonance points are generated in the middle frequency band, and the correlation coefficient and the mean square error are obviously changed; changing the middle longitudinal capacitance has an influence on the high-frequency section of the frequency response curve, but the change is smaller compared with the change generated at the head end and the tail end; the influence of the increase of the inductance of the winding on a frequency response curve is the same as that of the longitudinal capacitance, the increase of the inductance of the head end and the increase of the inductance of the tail end have larger influence on a middle frequency range, a resonance point is increased, the curve moves towards a low frequency direction, the variation of a correlation coefficient and the mean square error is obvious, and the deformation fault of the winding can be obviously reflected; the middle part inductance changes to influence the high-frequency band frequency response curve, but the change degree is small, and the sensitivity to middle part deformation is not high; the influence of 10% increase of the ground capacitance Cg on the frequency response curve is very small, the frequency response curve shifts to the low-frequency direction only after the middle part of the ground capacitance Cg is increased by 10%, and the related coefficient and the mean square error change are very small; therefore, the influence of the size of the GIS pull rod on the frequency response curve is very small, and deformation test patterns of the windings before and after the combined connection are basically consistent and have no obvious change.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111935055A (en) * | 2020-05-23 | 2020-11-13 | 青岛鼎信通讯股份有限公司 | Low-frequency medium-voltage carrier signal generating device for line-to-line relation recognition |
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| CN111935055A (en) * | 2020-05-23 | 2020-11-13 | 青岛鼎信通讯股份有限公司 | Low-frequency medium-voltage carrier signal generating device for line-to-line relation recognition |
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