CN205229335U - Voltage transformer excitation characteristic test device - Google Patents
Voltage transformer excitation characteristic test device Download PDFInfo
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- CN205229335U CN205229335U CN201520970154.3U CN201520970154U CN205229335U CN 205229335 U CN205229335 U CN 205229335U CN 201520970154 U CN201520970154 U CN 201520970154U CN 205229335 U CN205229335 U CN 205229335U
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Abstract
The utility model provides a voltage transformer excitation characteristic test device, voltage transformer excitation characteristic test device include power frequency voltage source (1) and with direct current source (2) that power frequency voltage source (1) concatenated. The utility model provides a voltage transformer excitation characteristic test device applys serial link's power frequency voltage source and direct current source simultaneously through the once side being surveyed voltage transformer, make the direct current source be in on the lower current potential, this electric pressure that can reduce the direct current source, can satisfy test requirement again, therefore, the influence that this voltage transformer excitation characteristic test device can really simulate direct current to voltage transformer excitation characteristic through superimposed power frequency voltage source and direct current source. And simultaneously, the utility model provides a voltage transformer excitation characteristic test device makes the volume of device diminish through the stack to make manufacturing cost reduce.
Description
Technical field
The utility model relates to electric system High-Voltage Experimentation Technology field, more specifically, relates to a kind of voltage transformer (VT) excitation property test unit.
Background technology
The electrical network of 10kV and 35kV is in operation and often there will be the situation that voltage transformer (VT) (PT) primary side fuse frequently fuses, and PT even can be caused to burn and the event such as blast time serious.The main cause analyzing PT primary side fuse blows is after deliberation in earth fault rejuvenation, when direct-current component flows through a PT winding, make the iron core generation magnetic saturation of PT, and then make ground capacitance and PT that ferroresonance occur, finally cause PT to be burnt.
For reduce PT occurred by the situation of burning, normally the excitation property of PT is detected, thus play prevention PT occurred by the situation of burning.At present mutual inductor volt-ampere tester is mainly used to the research of PT excitation property, mutual inductor volt-ampere tester can by the no-load voltage ratio of national standard measuring voltage mutual inductor, can the ratio of observational measurement voltage transformer (VT) and polarity, the acturl sencondaryload etc. of in-site measurement voltage transformer (VT).
Current researching DC mainly applies adjustable DC power supply at PT secondary side to the impact of PT excitation property, this mode can carry out one equivalence conversion to the DC component of primary side current, but the fault occurred in actual motion is not the impact of the DC current that secondary side produces, so above-mentioned testing apparatus still can not simulate the on high-tension side actual motion state of PT the most really.
Utility model content
The purpose of this utility model is to provide a kind of voltage transformer (VT) excitation property test unit, can not simulate the problem of the on high-tension side actual motion state of PT in the checkout equipment solving the prior art described in background technology directly, really.
In order to solve the problems of the technologies described above, the utility model provides following technical scheme:
A kind of voltage transformer (VT) excitation property test unit, the DC current source that described voltage transformer (VT) excitation property test unit comprises power frequency electric potential source and connects with described power-frequency voltage subject string.
Preferably, described power frequency electric potential source comprises power frequency electric potential source pressure regulator, Industrial Frequency Transformer, power frequency voltage divider, ac circuit electric capacity and ac circuit resistance, described power frequency electric potential source pressure regulator is connected in series with the low-pressure side of described Industrial Frequency Transformer, described power frequency voltage divider is connected with the on high-tension side one end of described Industrial Frequency Transformer, the other end ground connection of described power frequency voltage divider; Described ac circuit electric capacity and described ac circuit resistance are connected respectively to the on high-tension side other end of described Industrial Frequency Transformer, described ac circuit electric capacity and described ac circuit resistance parallel join and equal ground connection.
Preferably, described power frequency voltage divider comprises power frequency voltage divider high voltage arm capacitor connected in series and power frequency voltage divider low-voltage arm electric capacity, and described power frequency voltage divider low-voltage arm capacity earth.
Preferably, described power frequency electric potential source also comprises protection device, described protection device and described ac circuit resistance parallel join.
Preferably, described power frequency electric potential source also comprises the Industrial Frequency Transformer original edge voltage table and Industrial Frequency Transformer primary current table that are connected with described Industrial Frequency Transformer low-pressure side, with the power frequency divider voltage table of described power frequency voltage divider low-voltage arm Capacitance parallel connection, the voltage transformer (VT) primary current table be connected in series with tested voltage transformer (VT) primary side, the voltage transformer secondary voltage table in parallel with described tested voltage transformer secondary side.
Preferably, described power frequency electric potential source also comprises the power input voltage table in parallel with described power frequency electric potential source pressure regulator.
Preferably, described power frequency electric potential source also comprises the power frequency electric potential source prime switch and power frequency electric potential source rear class switch that are separately positioned on described power frequency electric potential source pressure regulator two ends.
Preferably, described DC current source comprises DC current source pressure regulator, DC current source transformer, high pressure bridge rectifier and DC filter capacitor, described DC current source pressure regulator and described DC current source transformer serial connection, described high pressure bridge rectifier is connected with the high-pressure side of described DC current source transformer, and described DC filter capacitor is in parallel with described high pressure bridge rectifier.
Preferably, described DC current source also comprises and the DC source output voltage meter of described DC filter capacitor parallel connection and the DC source output current table of connecting with described DC filter capacitor.
Preferably, described DC current source also comprises the DC current source switch in parallel with described DC current source pressure regulator.
The DC current source that the voltage transformer (VT) excitation property test unit that the utility model provides comprises power frequency electric potential source and connects with described power-frequency voltage subject string.The voltage transformer (VT) excitation property test unit that the utility model provides is by applying power frequency electric potential source connected in series and DC current source at the primary side of tested voltage transformer (VT) simultaneously, DC current source is made to be on lower current potential, this can reduce the electric pressure of DC current source, greatly reduce again the dielectric level of direct supply, therefore, this voltage transformer (VT) excitation property test unit by superposition power frequency electric potential source and DC current source can really analog DC on the impact of voltage transformer (VT) excitation property.Meanwhile, the voltage transformer (VT) excitation property test unit that the utility model provides makes the smaller volume of device by superposition, and dielectric level reduces, thus production cost is reduced.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the circuit diagram of the voltage transformer (VT) excitation property test unit that the utility model embodiment provides;
Fig. 2 is the circuit diagram of DC current source in the voltage transformer (VT) excitation property test unit that provides of the utility model embodiment;
Illustrate:
1-power frequency electric potential source, 2-DC current source, 3-power frequency electric potential source pressure regulator, 4-Industrial Frequency Transformer, 5-power frequency voltage divider, 6-power frequency voltage divider high voltage arm capacitor, 7-power frequency voltage divider low-voltage arm electric capacity, 8-ac circuit electric capacity, 9-ac circuit resistance, 10-protection device, 11-DC current source pressure regulator, 12-DC current source transformer, 13-high pressure bridge rectifier, 14-DC filter capacitor, 15-power input voltage table, 16-Industrial Frequency Transformer original edge voltage table, 17-Industrial Frequency Transformer primary current table, 18-power frequency divider voltage table, 19-voltage transformer (VT) primary current table, 20-voltage transformer secondary voltage table, 21-DC source output voltage meter, 22-DC source output current table, 23-power frequency electric potential source prime switch, 24-power frequency electric potential source rear class switch, 25-DC current source switch, the tested voltage transformer (VT) of 26-.
Embodiment
The purpose of this utility model voltage transformer (VT) excitation property test unit, solves the problem can not simulating the on high-tension side actual motion state of PT in the checkout equipment of prior art directly, really.
Technical scheme in the utility model embodiment is understood better in order to make those skilled in the art person, and enable the above-mentioned purpose of the utility model embodiment, feature and advantage become apparent more, below in conjunction with accompanying drawing, the technical scheme in the utility model embodiment is described in further detail.
Please refer to accompanying drawing 1, figure 1 show the circuit diagram of the voltage transformer (VT) excitation property test unit that the utility model embodiment provides.The DC current source 2 that the voltage transformer (VT) excitation property test unit that the utility model embodiment provides comprises power frequency electric potential source 1 and is connected in series with described power frequency electric potential source 1.This test unit can change the existing test method affected by DC current voltage transformer (VT) excitation property, can be in operation and be subject to electrical network high-pressure side DC component to the impact of excitation by more real analog voltage mutual inductor.This test unit is superposed by power frequency electric potential source 1 and DC current source 2 and forms, industrial frequency experiment system produces power frequency high voltage and is applied on the high-tension coil of tested voltage transformer (VT) 26, DC current source 2 is entered by the high pressure endnote of Industrial Frequency Transformer 4, this mode reduces the electric pressure of DC current source 2, greatly reduce the dielectric level of DC current source 2, thus reduce equipment cost.
Power frequency electric potential source 1 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides comprises power frequency electric potential source pressure regulator 3, Industrial Frequency Transformer 4, power frequency voltage divider 5, ac circuit electric capacity 8 and ac circuit resistance 9, described power frequency electric potential source pressure regulator 3 is connected in series with the low-pressure side of described Industrial Frequency Transformer 4, described power frequency voltage divider 5 is connected with described on high-tension side one end of Industrial Frequency Transformer 4, the other end ground connection of described power frequency voltage divider 5; Described ac circuit electric capacity 8 and described ac circuit resistance 9 are connected respectively to the on high-tension side other end of described Industrial Frequency Transformer 4, described ac circuit electric capacity 8 and described ac circuit resistance 9 parallel join and equal ground connection.
Wherein, power frequency electric potential source pressure regulator 3 is electric adjustable pressure device, can realize the regulatory function of input voltage;
After Industrial Frequency Transformer 4 is charged, power frequency high voltage can be produced at high-pressure side A, X end of Industrial Frequency Transformer 4, and be applied on tested voltage transformer (VT) 26 by this power frequency high voltage, and Industrial Frequency Transformer 4 high-pressure side X holds employing High-Voltage Insulation design, to improve dielectric level herein.This Industrial Frequency Transformer 4 is in order to bear larger DC current, and Industrial Frequency Transformer 4 secondary coil adopts thicker copper cash according to the through-current capability of direct current.
Power frequency voltage divider 5 measures for being used for the device that Industrial Frequency Transformer 4 high-pressure side A, X hold the power frequency high voltage produced, and this power frequency voltage divider 5 the principle of above-mentioned power frequency high voltage according to capacitance partial pressure, can be reduced to the acceptable low voltage voltage of test instrumentation;
Ac circuit electric capacity 8 and ac circuit resistance 9 provide current return for power frequency electric potential source 1.
Further, power frequency voltage divider 5 comprises power frequency voltage divider high voltage arm capacitor 6 connected in series and power frequency voltage divider low-voltage arm electric capacity 7, and power frequency voltage divider low-voltage arm electric capacity 7 ground connection.
Further; power frequency electric potential source 1 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides also comprises protection device 10; this protection device 10 inside is made up of high voltage varistor and discharging gap; DC current source 2 can be made to sustain this frequency high pressure; play the effect of protection, and then play the effect of the safety ensureing the person and equipment.
Power frequency electric potential source 1 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides also comprises the Industrial Frequency Transformer original edge voltage table 16 and Industrial Frequency Transformer primary current table 17 that are connected with described Industrial Frequency Transformer 4 low-pressure side, the power frequency divider voltage table 18 in parallel with described power frequency voltage divider low-voltage arm electric capacity 7, the voltage transformer (VT) primary current table 19 be connected in series with tested voltage transformer (VT) primary side, the voltage transformer secondary voltage table 20 in parallel with described tested voltage transformer secondary side.
Wherein, Industrial Frequency Transformer original edge voltage table 16 is used for measuring the voltage on the former limit of Industrial Frequency Transformer 4;
Industrial Frequency Transformer primary current table 17 is used for measuring the current value of Industrial Frequency Transformer 4 input end;
Power frequency divider voltage table 18 is used for measuring the voltage at power frequency voltage divider low-voltage arm electric capacity 7 two ends in power frequency voltage divider 5, converts with this magnitude of voltage being applied to tested voltage transformer (VT) 26 high-pressure side;
Voltage transformer (VT) primary current table 19 is used for measuring the electric current that tested voltage transformer (VT) 26 primary side passes through;
Voltage transformer secondary voltage table 20 is used for measuring the magnitude of voltage of tested voltage transformer (VT) 26 secondary side.
Further, power frequency electric potential source 1 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides also comprises the power input voltage table 15 in parallel with power frequency electric potential source pressure regulator 3, this power input voltage table 15 be used for measure AC power input magnitude of voltage.
Further, power frequency electric potential source 1 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides also comprises the power frequency electric potential source prime switch 23 and power frequency electric potential source rear class switch 24 that are separately positioned on power frequency electric potential source pressure regulator 3 two ends, so that disconnect or switch on power.
The course of work of the power frequency electric potential source 1 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides is: the communication power supply of 380V gives this test unit provides energy, and this energy is input to power frequency electric potential source prime switch 23.After power frequency electric potential source prime switch 23 is closed, power frequency electric potential source pressure regulator 3 is just charged, and power frequency electric potential source pressure regulator 3 just regulates the voltage of input simultaneously, and the voltage through overregulating enters power frequency electric potential source rear class switch 24.After power frequency electric potential source rear class switch 24 is closed, Industrial Frequency Transformer 4 is just charged, produce power frequency high voltage at Industrial Frequency Transformer 4 high-pressure side A, X two end points places simultaneously, power frequency high voltage is applied on tested voltage transformer (VT) 26 through A end points, and power frequency high voltage is applied on the DC current source 2 of parallel join, ac circuit electric capacity 8 and ac circuit resistance 9 through X end points, then enters the earth through ground connection.Power frequency high voltage is when through DC current source 2, and protection device 10 can make DC current source 2 sustain this frequency high pressure, plays the effect of protection, and then plays the effect of the safety ensureing the person and equipment.The power frequency voltage divider 5 be made up of power frequency voltage divider high voltage arm capacitor 6, power frequency voltage divider high voltage arm capacitor 7 is used to the device measuring power frequency high voltage, the principle of power frequency high voltage by capacitance partial pressure, can be reduced to the acceptable low voltage voltage of test instrumentation.
Please refer to accompanying drawing 2, Figure 2 illustrate the circuit diagram of DC current source in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides.DC current source 2 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides comprises DC current source pressure regulator 11, DC current source transformer 12, high pressure bridge rectifier 13 and DC filter capacitor 14, described DC current source pressure regulator 11 and described DC current source transformer 12 are connected in series, described high pressure bridge rectifier 13 is connected with the high-pressure side of described DC current source transformer 12, and described DC filter capacitor 14 is in parallel with described high pressure bridge rectifier 13.
Wherein, DC current source pressure regulator 11 is electric adjusting device, can realize the regulatory function of input voltage;
Magnitude of voltage can raise by DC current source transformer 12, and then provides voltage to high pressure bridge rectifier 13;
The voltage that DC current source transformer 12 provides by high pressure bridge rectifier 13 carries out rectification, and alternating current is become direct current;
DC filter capacitor 14 carries out filtering by becoming galvanic electric current, ensures the direct current that output ripple coefficient is less.
High pressure bridge rectifier 13 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides and DC filter capacitor 14 can bear the high voltage caused by the internal resistance of tested voltage transformer (VT) 26.
DC current source 2 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides also comprises and the DC source output voltage meter 21 of DC filter capacitor 14 parallel connection and the DC source output current table 22 of connecting with DC filter capacitor 14.
Wherein, DC source output voltage meter 21 be used for measuring current source export DC voltage value;
DC source output current table 22 be used for measuring current source export DC current values.
Further, the DC current source 2 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides also comprises the DC current source switch 25 in parallel with DC current source pressure regulator 11, and this DC current source switch 25 is for disconnecting or switching on power.
The course of work of the DC current source 2 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides is: the communication power supply of 220V gives this test unit provides energy, and this energy is input to DC current source switch 25.After this DC current source switch 25 is closed, DC current source pressure regulator 11 is charged, and the voltage that DC current source pressure regulator 11 inputs simultaneously regulates, and the voltage after adjustment inputs to DC current source transformer 12.The voltage of DC current source transformer 12 to input boosts, and the voltage after boosting enters high pressure bridge rectifier 13 and carries out rectification, and becomes direct current.Be connected in parallel on DC filter capacitor 21 on high pressure bridge rectifier 13 to becoming galvanic current filtering, to ensure the direct current that output ripple coefficient is less.
DC current source 2 in the voltage transformer (VT) excitation property test unit that the utility model embodiment provides is concatenated into industrial frequency experiment loop from power frequency low pressure end, and DC current source 2 and power frequency electric potential source 1 work simultaneously, achieve the function that power frequency electric potential source 1 and DC current source 2 superpose in tested voltage transformer (VT) 26 first siding ring, and can the tested voltage transformer (VT) 26 of dry run really primary side DC component on the impact of voltage transformer (VT) excitation property.Meanwhile, the voltage transformer (VT) excitation property test unit that the utility model provides makes the smaller volume of device by superposition, and dielectric level reduces, thus production cost is reduced.
Although describe the utility model in the mode of specific embodiment, but to those skilled in the art, when not departing from the spirit and scope of the present utility model that appended claims limits, can carry out variations and modifications to the utility model, these changes and amendment are included in scope of the present utility model equally.
Claims (8)
1. a voltage transformer (VT) excitation property test unit, it is characterized in that, the DC current source (2) that described voltage transformer (VT) excitation property test unit comprises power frequency electric potential source (1) and is connected in series with described power frequency electric potential source (1);
Wherein, described power frequency electric potential source (1) comprises power frequency electric potential source pressure regulator (3), Industrial Frequency Transformer (4), power frequency voltage divider (5), ac circuit electric capacity (8) and ac circuit resistance (9), described power frequency electric potential source pressure regulator (3) is connected in series with the low-pressure side of described Industrial Frequency Transformer (4), described power frequency voltage divider (5) is connected with described Industrial Frequency Transformer (4) on high-tension side one end, the other end ground connection of described power frequency voltage divider (5); Described ac circuit electric capacity (8) and described ac circuit resistance (9) are connected respectively to described Industrial Frequency Transformer (4) the on high-tension side other end, described ac circuit electric capacity (8) and described ac circuit resistance (9) parallel join and equal ground connection;
Described DC current source (2) comprises DC current source pressure regulator (11), DC current source transformer (12), high pressure bridge rectifier (13) and DC filter capacitor (14), described DC current source pressure regulator (11) and described DC current source transformer (12) serial connection, described high pressure bridge rectifier (13) is connected with the high-pressure side of described DC current source transformer (12), and described DC filter capacitor (14) is in parallel with described high pressure bridge rectifier (13).
2. voltage transformer (VT) excitation property test unit according to claim 1, it is characterized in that, described power frequency voltage divider (5) comprises power frequency voltage divider high voltage arm capacitor (6) connected in series and power frequency voltage divider low-voltage arm electric capacity (7), and described power frequency voltage divider low-voltage arm electric capacity (7) ground connection.
3. voltage transformer (VT) excitation property test unit according to claim 2; it is characterized in that; described power frequency electric potential source (1) also comprises protection device (10), described protection device (10) and described ac circuit resistance (9) parallel join.
4. voltage transformer (VT) excitation property test unit according to claim 3, it is characterized in that, described power frequency electric potential source (1) also comprises the Industrial Frequency Transformer original edge voltage table (16) and Industrial Frequency Transformer primary current table (17) that are connected with described Industrial Frequency Transformer (4) low-pressure side, the power frequency divider voltage table (18) in parallel with described power frequency voltage divider low-voltage arm electric capacity (7), the voltage transformer (VT) primary current table (19) be connected in series with tested voltage transformer (VT) primary side, the voltage transformer secondary voltage table (20) in parallel with described tested voltage transformer secondary side.
5. voltage transformer (VT) excitation property test unit according to claim 4, it is characterized in that, described power frequency electric potential source (1) also comprises the power input voltage table (15) in parallel with described power frequency electric potential source pressure regulator (3).
6. according to the voltage transformer (VT) excitation property test unit in claim 1-5 described in any one, it is characterized in that, described power frequency electric potential source (1) also comprises power frequency electric potential source prime switch (23) and power frequency electric potential source rear class switch (24) that are separately positioned on described power frequency electric potential source pressure regulator (3) two ends.
7. voltage transformer (VT) excitation property test unit according to claim 1, it is characterized in that, the DC source output current table (22) that described DC current source (2) also comprises the DC source output voltage meter (21) in parallel with described DC filter capacitor (14) and connects with described DC filter capacitor (14).
8. voltage transformer (VT) excitation property test unit according to claim 7, it is characterized in that, described DC current source (2) also comprises the DC current source switch (25) in parallel with described DC current source pressure regulator (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520970154.3U CN205229335U (en) | 2015-11-30 | 2015-11-30 | Voltage transformer excitation characteristic test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520970154.3U CN205229335U (en) | 2015-11-30 | 2015-11-30 | Voltage transformer excitation characteristic test device |
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| CN205229335U true CN205229335U (en) | 2016-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781419A (en) * | 2020-07-08 | 2020-10-16 | 上海马拉松·革新电气有限公司 | Integrated voltage detection and signal acquisition system for medium and high voltage generator |
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2015
- 2015-11-30 CN CN201520970154.3U patent/CN205229335U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111781419A (en) * | 2020-07-08 | 2020-10-16 | 上海马拉松·革新电气有限公司 | Integrated voltage detection and signal acquisition system for medium and high voltage generator |
| CN111781419B (en) * | 2020-07-08 | 2022-10-28 | 上海马拉松·革新电气有限公司 | Integrated voltage detection and signal acquisition system for medium and high voltage generator |
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Effective date of registration: 20210416 Address after: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee after: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Address before: Yunda economic and Technological Development Zone in Yunnan province Kunming city 650217 West Road No. 105 Patentee before: YUNNAN POWER GRID CO., LTD. ELECTRIC POWER Research Institute Patentee before: BEIJING HUATIAN MECHANICAL-ELECTRICAL INSTITUTE Co.,Ltd. |