CN216133154U - Induction voltage withstand test device for transformer - Google Patents
Induction voltage withstand test device for transformer Download PDFInfo
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- CN216133154U CN216133154U CN202122072655.8U CN202122072655U CN216133154U CN 216133154 U CN216133154 U CN 216133154U CN 202122072655 U CN202122072655 U CN 202122072655U CN 216133154 U CN216133154 U CN 216133154U
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Abstract
The utility model provides an induction withstand voltage test device for a transformer, which comprises: a test power supply configured to provide a supply voltage; a test transformer connected to a test power supply and a low voltage outlet terminal of a low voltage side of the transformer under test and configured to obtain a power supply voltage from the test power supply, convert the power supply voltage into a test voltage, and output the test voltage to a winding of the low voltage side of the transformer under test; the high-voltage transformer testing device comprises a signal receiving and measuring device, a high-voltage bushing and a signal processing and processing device, wherein the signal receiving and measuring device is connected to the high-voltage bushing on the high-voltage side of the tested transformer and is configured to receive a discharging signal of the tested transformer from the high-voltage bushing, and measure the discharging amount of the discharging signal, and the high-voltage bushing is located in a cable bus box which contains the tested transformer and is filled with transformer oil. The induction voltage withstand test device provided by the utility model does not need to install a test sleeve on the high-voltage side during testing, so that the installation difficulty is reduced.
Description
Technical Field
The utility model relates to the field of transformers, in particular to an inductive voltage withstand test device for a cable outlet transformer.
Background
Transformers of the 220kV and above voltage class are specified to undergo routine tests at handover including an induced withstand voltage test with partial discharge measurement. When performing the induced voltage withstand test, the induced voltage withstand test apparatus needs to transmit a discharge signal at the high-voltage side terminal of the transformer to a test terminal of the test apparatus. For the existing cable outgoing transformer, because the terminal of the three-phase high-voltage side is not provided with an air insulating sleeve, in order to transmit the discharge signal of the terminal of the high-voltage side to the test end of the test device, the test sleeve needs to be temporarily installed on the site of the terminal of the high-voltage side; however, such installation is difficult due to construction period and space in the field.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides an induced voltage withstand test device for a cable outlet transformer, so as to solve the above problems.
According to an embodiment of the present invention, there is provided an induced voltage withstand test apparatus for a transformer, characterized by comprising: a test power supply configured to provide a supply voltage; a test transformer connected to the test power supply and a low voltage outlet terminal of a low voltage side of a transformer under test and configured to obtain the power supply voltage from the test power supply, convert the power supply voltage into a test voltage, and output the test voltage to a winding of the low voltage side of the transformer under test; a signal receiving and measuring device connected to a high-voltage bushing of a high-voltage side of the transformer under test and configured to receive a discharge signal of the transformer under test from the high-voltage bushing, and to measure a discharge amount of the discharge signal, the high-voltage bushing being located in a cable bus bar box accommodating the transformer under test and filled with transformer oil.
According to the scheme, the induction withstand voltage test device can directly measure the partial discharge signal through the oil-oil casing without installing a test casing on the high-voltage side, so that the installation difficulty is reduced, and the wiring of the test device is easier; and because the cable bus box of the high-voltage side of the transformer is filled with the transformer oil in the test process, the insulation strength of the end terminal of the high-voltage side can be ensured.
In one embodiment, the induced voltage withstand test apparatus further comprises: a display screen connected to the signal receiving and measuring device and configured to display the amount of discharge.
In one embodiment, the induced voltage withstand test apparatus further comprises: a controller connected to the test transformer and configured to control a value of the test voltage output by the test transformer. In this embodiment, the controller includes: a voltage measurement module connected to the test transformer and configured to measure a value of the test voltage output by the test transformer; and a voltage regulator connected to the voltage measurement module and the test transformer and configured to adjust a value of the test voltage output by the test transformer according to a value of the test voltage measured by the voltage measurement module and a predetermined test voltage value.
In one embodiment, the induced voltage withstand test apparatus further comprises: a comparison module connected to the voltage measurement module in the controller and configured to compare a value of the test voltage measured by the voltage measurement module to a test voltage threshold and to generate a turn-off signal when the value of the test voltage is greater than the test voltage threshold; and a switch connected to the comparison module and the test transformer and configured to disconnect the test transformer upon receiving the disconnect signal from the comparison module.
In one embodiment, the induced voltage withstand test apparatus further comprises: a compensation reactor connected to the test transformer and the transformer under test and configured to provide a compensation current for the transformer under test.
In one embodiment, the high voltage bushing is a condenser bushing comprising an oil-oil bushing.
The induction withstand voltage test device directly receives a partial discharge signal from the high-voltage side of the transformer through the capacitive bushing comprising the oil-oil bushing, so that the terminal of the high-voltage side is not required to be exposed in the air, and an external interference signal is shielded by the cable bus box of the high-voltage side, so that the anti-interference capability of the terminal of the high-voltage side of the transformer is stronger.
Drawings
The foregoing and other features and advantages of the utility model will become more apparent to those skilled in the art to which the utility model relates upon consideration of the following detailed description of a preferred embodiment of the utility model with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural connection diagram of an induced voltage withstand test apparatus and a transformer under test according to an embodiment of the present invention.
Fig. 2 is a schematic structural connection diagram of parts of an induction withstand voltage testing apparatus according to an embodiment of the present invention.
Fig. 3 is a schematic wiring diagram of the induction withstand voltage test apparatus according to an embodiment of the present invention when performing an induction withstand voltage test on a transformer under test.
Wherein the reference numbers are as follows:
100: induction withstand voltage test apparatus 102, 210: test power supply 104, 220: test transformer
106. 230: signal reception and measurement 110: transformer under test 111: low-voltage outlet terminal equipment
112: the high-voltage bushing 113: neutral outlet terminal 114: cable bus box
120: low-voltage cable 130: high-voltage cable 140: grounding cable
240: the display screen 250: the controller 252: voltage measuring module
254: the voltage regulator 260: the comparison module 270: switch with a switch body
280: compensation reactor
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by referring to the following examples.
As used herein, the term "include" and its variants mean open-ended terms in the sense of "including, but not limited to. The term "based on" means "based at least in part on". The terms "one embodiment" and "an embodiment" mean "at least one embodiment". The term "another embodiment" means "at least one other embodiment". Whether explicit or implicit, a term is defined consistently throughout this specification unless the context clearly dictates otherwise.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic structural connection diagram of an induced withstand voltage test apparatus and a transformer under test according to an embodiment of the present invention.
As shown in fig. 1, an inductive withstand voltage test apparatus 100 for performing an inductive withstand voltage test with partial discharge measurement on a transformer 110 under test includes a test power supply 102, a test transformer 104, and a signal receiving and measuring device 106.
The test power supply 102 may provide a supply voltage for the induced withstand voltage test, and typically the frequency of the test power supply 102 is greater than 100 Hz. The test transformer 104 is connected to the test power supply 102 to obtain a supply voltage therefrom. The test transformer 104 can convert the power supply voltage to a test voltage required for performing an induced withstand voltage test. The test transformer 104 is also connected to a low-voltage outlet terminal 111 of the three-phase terminal on the low-voltage side of the transformer under test 110, for example, by a low-voltage cable 120, to output the converted test voltage to the transformer under test 110 to energize the winding on the low-voltage side of the transformer under test 110.
Transformer oil (shown by a dotted line in the cable bus box 114 in fig. 1) is injected into the cable bus box 114 on the high-voltage side of the transformer 110 under test, so that the three-phase terminal ends (not shown) on the high-voltage side of the transformer 110 under test and the high-voltage bushings 112 thereof are immersed in the transformer oil without being exposed to air, thereby ensuring the insulation strength of the terminal ends on the high-voltage side. The high voltage bushing 112 of the transformer under test 110 may be a condenser bushing, which in one embodiment may comprise an oil-to-oil bushing. The test tap of the high voltage bushing 112 is connected in transformer oil via a high voltage cable 130 to an outlet terminal on the housing of the cable bus box 114 of the transformer 110 under test and is further connected to the signal receiving and measuring device 106 of the inductive withstand voltage testing apparatus 100, which signal receiving and measuring device 106 may comprise, for example, a partial discharge meter. In one embodiment, the high voltage bushing 112 may be connected to the signal receiving and measuring device 106 via an impedance, measuring cable, or the like (not shown) through an outlet terminal on the housing of the cable bus box 114.
The signal receiving and measuring device 106 receives the discharge signal of the transformer under test 110 from the high voltage bushing 112 of the transformer under test 110 and measures the discharge amount of the discharge signal, so that an operator can determine the test result of the induced withstand voltage test according to the measured discharge amount (e.g., partial discharge amount).
As shown in fig. 1, the neutral outlet 113 of the transformer under test 110 is grounded via a grounding cable 140, and the induced voltage withstand test apparatus 100 is grounded via the cable.
It should be understood that the components shown in fig. 1 are only exemplary, and in practical applications, one or more components may be added or subtracted as needed, for example, the inductive voltage withstand test apparatus 100 may further include a display screen, a compensation reactor, a controller, a comparison module, a switch, an impedance (not shown in fig. 1), and the like.
Fig. 2 is a schematic structural connection diagram of each component of the induced withstand voltage testing apparatus 100 according to an embodiment of the present invention. Referring to fig. 2, the induced withstand voltage test apparatus 100 may include a test power supply 210, a test transformer 220, a signal receiving and measuring device 230, and optionally a display screen 240, a controller 250, a comparison module 260, a switch 270, and a compensation reactor 280, wherein the test power supply 210 corresponds to the test power supply 102 in fig. 1, the test transformer 220 corresponds to the test transformer 104 in fig. 1, and the signal receiving and measuring device 230 corresponds to the signal receiving and measuring device 106 in fig. 1.
As shown in fig. 2, the test power supply 210 is connected to the test transformer 220 to supply a power supply voltage to the test transformer 220. The test transformer 220 converts a power supply voltage supplied from the test power supply 210 into a test voltage for an induced withstand voltage test of the transformer under test. In one embodiment, test transformer 220 may be connected to controller 250 to control or adjust the test voltage output by test transformer 220 using controller 250. The controller 250 may include a voltage measurement module 252 and a voltage regulator 254. The voltage measurement module 252 may be connected to the test transformer 220 and configured to measure a value of a test voltage output by the test transformer 220. When the value of the measured test voltage does not conform to a predetermined test voltage value suitable for the induced withstand voltage test of the transformer under test (e.g., a voltage value required to perform the induced withstand voltage test for the transformer under test), the value of the test voltage output by the test transformer 220 may be adjusted by the voltage regulator 254. The voltage regulator 254 may be connected to the voltage measurement module 252 to obtain the measured value of the test voltage of the test transformer from the voltage measurement module 252, and adjust the value of the test voltage output by the test transformer 220 as necessary to reach the test voltage value required for the induced withstand voltage test based on a predetermined test voltage value suitable for the induced withstand voltage test of the transformer under test.
The signal receiving and measuring device 230 may provide the measured discharge amount to the display screen 240 in the form of a signal after receiving a discharge signal of the transformer under test from the transformer under test (not shown in fig. 2) and measuring the discharge amount of the discharge signal. The display screen 240 is connected to the signal receiving and measuring device 230 and is configured to display the discharge amount, e.g. the partial discharge amount, of the transformer under test.
Optionally, the comparison module 260 may be connected to the voltage measurement module 252 of the controller 250 to obtain the value of the test voltage output by the test transformer 220 measured by the voltage measurement module 252. The comparison module 260 may be configured to compare the measured test voltage value with a test voltage threshold (e.g., a voltage value that may cause a failure of the transformer under test during an induced withstand voltage test), generate an off signal when the measured test voltage value is greater than the test voltage threshold, and provide the off signal to the switch 270. The switch 270 is connected to the comparison module 260 to receive the disconnect signal from the comparison module 260. The switch 270 is also connected to the test transformer 220 to disconnect the test transformer 220 upon receiving a disconnect signal to avoid damage to the transformer under test.
Optionally, the induced voltage withstand test apparatus 100 may include a compensation reactor 280 to compensate the capacitive current of the transformer under test in the case where the capacity of the transformer under test is insufficient or the rated output current is small and cannot meet the voltage withstand test requirement. The compensation reactor 280 may be connected to the test transformer 220 and the transformer under test and configured to provide a compensation current for the transformer under test based on a rated output current of the test transformer 220.
It should be understood that the components included in the induced voltage withstand test apparatus 100 shown in fig. 2 are only exemplary, and in practical applications, one or more components may be added or reduced as needed, for example, a high voltage divider, a supporting transformer, a coupling capacitor, and the like may be added.
Fig. 3 shows a schematic wiring diagram of the induced withstand voltage test apparatus according to an embodiment of the present invention when performing an induced withstand voltage test on a transformer under test.
In the embodiment shown in fig. 3, test power supply 210 may be connected to a primary winding of test transformer 220, with a secondary winding of test transformer 220 connected to optional compensation reactor 280 (shown in phantom in fig. 3). The compensation reactor 280 is connected in parallel to the low-voltage side coil of the transformer under test 110. The neutral point of the tested transformer 110 is grounded and the high voltage side coil is connected to the signal receiving and measuring device 230. In one embodiment, the signal receiving and measuring device 230 may be connected to an optional display screen 240.
Alternatively, the test transformer 220 may be connected to the controller 250 and the switch 270. The controller 250 is connected to the comparison module 260 and the comparison module 260 is connected to the switch 270, wherein the switch 270 may be configured to be connected between the test transformer 220 and the transformer 110 under test or an optional compensation reactor 280 to disconnect the test transformer 220 when needed.
According to an embodiment of the present invention, there is provided an induced voltage withstand test apparatus for a transformer, characterized by comprising: a test power supply configured to provide a supply voltage; a test transformer connected to the test power supply and a low voltage outlet terminal of a low voltage side of a transformer under test and configured to obtain the power supply voltage from the test power supply, convert the power supply voltage into a test voltage, and output the test voltage to a winding of the low voltage side of the transformer under test; a signal receiving and measuring device connected to a high-voltage bushing of a high-voltage side of the transformer under test and configured to receive a discharge signal of the transformer under test from the high-voltage bushing, and to measure a discharge amount of the discharge signal, the high-voltage bushing being located in a cable bus bar box accommodating the transformer under test and filled with transformer oil, and the high-voltage bushing being placed in the transformer oil. The induction voltage withstand test device provided by the utility model does not need to install a test sleeve on the high-voltage side during testing, so that the installation difficulty is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. An inductive withstand voltage test apparatus (100) for a transformer, characterized by comprising:
a test power supply (102) configured to provide a supply voltage;
a test transformer (104) connected to the test power supply and a low voltage outlet (111) of a low voltage side of a transformer under test (110) and configured to obtain the power supply voltage from the test power supply, convert the power supply voltage to a test voltage, and output the test voltage to a winding of the low voltage side of the transformer under test; and
a signal receiving and measuring device (106) connected to a high voltage bushing (112) of a high voltage side of the transformer under test and configured to receive a discharge signal of the transformer under test from the high voltage bushing, and to measure a discharge amount of the discharge signal, the high voltage bushing being located in a cable box accommodating the transformer under test and filled with transformer oil, and the high voltage bushing being placed in the transformer oil.
2. The induced withstand voltage test apparatus (100) for the transformer according to claim 1, wherein the induced withstand voltage test apparatus (100) further comprises:
a display screen (240) connected to the signal receiving and measuring device and configured to display the amount of discharge.
3. The induced withstand voltage test apparatus (100) for the transformer according to claim 1, wherein the induced withstand voltage test apparatus (100) further comprises:
a controller (250) connected to the test transformer and configured to control a value of the test voltage output by the test transformer.
4. The apparatus (100) for testing induced withstand voltage of a transformer according to claim 3, wherein the controller (250) comprises:
a voltage measurement module (252) connected to the test transformer and configured to measure a value of the test voltage output by the test transformer; and
a voltage regulator (254) connected to the voltage measurement module and the test transformer and configured to adjust a value of the test voltage output by the test transformer according to the value of the test voltage measured by the voltage measurement module and a predetermined test voltage value.
5. The induced withstand voltage test apparatus (100) for the transformer according to claim 4, wherein the induced withstand voltage test apparatus (100) further comprises:
a comparison module (260) connected to the voltage measurement module in the controller and configured to compare a value of the test voltage measured by the voltage measurement module to a test voltage threshold and to generate a turn-off signal when the value of the test voltage is greater than the test voltage threshold; and
a switch (270) connected to the comparison module and the test transformer and configured to disconnect the test transformer upon receiving the disconnect signal from the comparison module.
6. The induced withstand voltage test apparatus (100) for the transformer according to claim 1, wherein the induced withstand voltage test apparatus (100) further comprises:
a compensation reactor (280) connected to the test transformer and the transformer under test and configured to provide a compensation current for the transformer under test.
7. The apparatus (100) for an inductive withstand voltage test of a transformer according to claim 1, wherein the high voltage bushing is a condenser bushing including an oil-oil bushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122072655.8U CN216133154U (en) | 2021-08-30 | 2021-08-30 | Induction voltage withstand test device for transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122072655.8U CN216133154U (en) | 2021-08-30 | 2021-08-30 | Induction voltage withstand test device for transformer |
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| Publication Number | Publication Date |
|---|---|
| CN216133154U true CN216133154U (en) | 2022-03-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122072655.8U Active CN216133154U (en) | 2021-08-30 | 2021-08-30 | Induction voltage withstand test device for transformer |
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| CN (1) | CN216133154U (en) |
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- 2021-08-30 CN CN202122072655.8U patent/CN216133154U/en active Active
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Address after: No.10, Weihua West Road, Shizhong District, Jinan City, Shandong Province, 250022 Patentee after: Jinan Siemens Energy Transformer Co.,Ltd. Address before: No.10, Weihua West Road, Shizhong District, Jinan City, Shandong Province, 250022 Patentee before: SIEMENS TRANSFORMER (JINAN) CO.,LTD. |