CN211374930U - Test transformer and combined electrical apparatus, cable combined type jointing equipment - Google Patents
Test transformer and combined electrical apparatus, cable combined type jointing equipment Download PDFInfo
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- CN211374930U CN211374930U CN201921462435.2U CN201921462435U CN211374930U CN 211374930 U CN211374930 U CN 211374930U CN 201921462435 U CN201921462435 U CN 201921462435U CN 211374930 U CN211374930 U CN 211374930U
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 238000004804 winding Methods 0.000 abstract description 24
- 238000000034 method Methods 0.000 abstract description 8
- 239000002131 composite material Substances 0.000 abstract description 4
- 238000004088 simulation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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- 238000009666 routine test Methods 0.000 description 1
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Abstract
The utility model relates to a high voltage power equipment detects technical field, in particular to test transformer and combined electrical apparatus, cable composite junction device. The utility model is connected with the transformer by the GIS, and the GIS and the transformer are connected with the ground short circuit row by adopting the ground switch of the ground switch nearest 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 utility model relates to a high voltage power equipment detects technical field, especially relates to a test transformer and combined electrical apparatus, cable composite junction device.
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
For overcoming the problem that exists among the above-mentioned prior art, the utility model provides a test transformer and combined electrical apparatus, cable combined type jointing equipment. The method is simple in structure and reasonable in combination, and under the combined connection condition of the transformer, the closed combined electrical appliance and the cable, a feasible method can be provided, so that the relevant test operation under the special connection mode of the transformer, the closed combined electrical appliance and the cable is standardized, testers can rely on the method, the test quality is guaranteed, the test time is reduced, and the test efficiency is improved.
In order to achieve the above object, the utility model adopts the following technical scheme:
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 utility model has the advantages and beneficial effects that:
the utility model has the characteristics of simple structure, it is reasonable to make up, through establishing transformer winding distributing type model and using PSPICE to carry out relevant emulation, can obtain the influence condition of test parameter change to the test result behind the compound connection, and then help verifies test method's exactness.
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
To facilitate understanding and implementing the present invention by those of ordinary skill in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments, which are used to illustrate the present invention and should not be construed as limited by the scope of the present invention.
Fig. 1 is a schematic diagram of the connection between the GIS and the transformer according to the present invention;
fig. 2 is a test wiring diagram of the grounding switch of the present invention when measuring the insulation characteristic of the transformer;
fig. 3 is an equivalent circuit network diagram of a transformer winding according to 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 utility model relates to a test transformer and combined electrical apparatus, cable combined type jointing equipment, as shown in fig. 1 and fig. 2, fig. 1 is the schematic diagram that GIS and transformer are connected, and fig. 2 is the experimental wiring when ground switch department develops transformer insulation characteristic measurement. After equipment seals, in order to carry out the relevant experiment under the condition of not demolising the connection, the utility model discloses a carry out the mode that corresponding connection was arranged to ground short circuit at the earthing switch who is apart from the nearest earthing switch of transformer T.
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.
The utility model discloses when actual test, one side of earthing switch was kept away from earthing switch with earthing switch short circuit row SJ on the scene is unpack apart to make it keep unsettled state, earthing switch short circuit row SJ is as experimental wiring end to ground. 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.
As shown in fig. 3, fig. 3 is a network diagram of the equivalent circuit of the transformer winding according to the present invention. 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.
Combined type connecting device is mainly at electric capacity and the resistance that has increased measurement circuit to the influence of transformer, establishes transformer winding distributed model and uses PSPICE to carry out relevant emulation, obtains the influence condition of test parameter change to the test result behind the composite connection, and then help verifies test method is correct.
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 aforesaid specific implementation mode is the utility model discloses a preferred embodiment, can not be right the utility model discloses can be according to the utility model discloses a technical scheme and actual conditions determine specific implementation mode, and other any change or other equivalent replacement modes of doing for deviating from the utility model discloses a technical scheme all contain within the scope of protection of the utility model.
Claims (4)
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: the side, far away from the grounding switch, of the grounding short-circuit bar is disconnected, and is 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921462435.2U CN211374930U (en) | 2019-09-04 | 2019-09-04 | Test transformer and combined electrical apparatus, cable combined type jointing equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921462435.2U CN211374930U (en) | 2019-09-04 | 2019-09-04 | Test transformer and combined electrical apparatus, cable combined type jointing equipment |
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| CN211374930U true CN211374930U (en) | 2020-08-28 |
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| CN201921462435.2U Active CN211374930U (en) | 2019-09-04 | 2019-09-04 | Test transformer and combined electrical apparatus, cable combined type jointing equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632453A (en) * | 2019-09-04 | 2019-12-31 | 国网辽宁省电力有限公司电力科学研究院 | Test transformer, combined electrical apparatus and cable combined type connecting equipment and test method thereof |
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2019
- 2019-09-04 CN CN201921462435.2U patent/CN211374930U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632453A (en) * | 2019-09-04 | 2019-12-31 | 国网辽宁省电力有限公司电力科学研究院 | Test transformer, combined electrical apparatus and cable combined type connecting equipment and test method thereof |
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