CN105450007A - Power supply for direct current magnetic biasing tests on transformers - Google Patents
Power supply for direct current magnetic biasing tests on transformers Download PDFInfo
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- CN105450007A CN105450007A CN201510900346.1A CN201510900346A CN105450007A CN 105450007 A CN105450007 A CN 105450007A CN 201510900346 A CN201510900346 A CN 201510900346A CN 105450007 A CN105450007 A CN 105450007A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention provides a power supply for direct current magnetic biasing tests on transformers. The power supply comprises a direct current branch, an alternating current branch and a protection branch, wherein the direct current branch is connected between high-voltage windings of an intermediate transformer and a tested transformer in series, and is used for generating direct currents and injecting the direct currents into the high-voltage windings of the intermediate transformer and the tested transformer; the alternating current branch is connected with the direct current branch in parallel, and is used for providing alternating current load current channels for the intermediate transformer and the tested transformer and preventing alternating current load currents of the intermediate transformer and the tested transformer from flowing into the direct current branch; and the protection branch is connected with the direct current branch in parallel, is used for protecting the direct current branch, and preventing high voltages of the intermediate transformer and the tested transformer from being applied to the direct current branch to damage the direct current branch when the alternating current branch is broken down. According to the technical scheme provided by the invention, accurate adjustment on a direct current test current and long-term stable development of the direct current magnetic biasing tests on the transformers can be achieved; and the direct current magnetic biasing test on the single-phase or three-phase large power transformer is reliably finished.
Description
Technical field
The present invention relates to a kind of power supply, specifically relate to a kind of high-power transformer D.C. magnetic biasing electric source for test purposes.
Background technology
Along with lasting construction that is super, extra-high voltage direct-current transmission engineering, increasing power transformer receives the impact of D.C. magnetic biasing.For the AC system of transformer neutral point ground connection, monopolar ground return DC operation mode can cause two transformer stations being in different DC potential to form loop through transmission line, and have direct current to enter transformer neutral point and Transformer Winding, make transformer occur DC magnetic bias phenomena.After D.C. magnetic biasing appears in transformer, exciting current distortion can be produced on transformer, noise increases, vibrate the impact of the aspects such as aggravation, local overheating unshakable in one's determination, the safe operation of serious threat power transformer.
In recent years, great Liang Chao, ultra high voltage large-scale power transformer equipment puts into operation, in the urgent need to grasping the D.C. magnetic biasing tolerance of large-scale power transformer, for the D.C. magnetic biasing control measures of electrical network provides reference frame.Applying direct current to power transformer and carry out D.C. magnetic biasing test, is the most direct and effective means of research large-scale power transformer D.C. magnetic biasing tolerance.
But; there is no one at present both at home and abroad for the power supply of large-scale power transformer D.C. magnetic biasing test; the connection in series-parallel of most employing plurality of groups of storage batteries produces direct current; output current is not only little but also current waveform is unstable; transformer DC magnetic bias test when cannot complete long; lack test loop protective device simultaneously, cause transformer DC magnetic bias to be tested and there is huge potential safety hazard.
Summary of the invention
In order to solve the problems referred to above existing in prior art, the invention provides a kind of transformer DC magnetic bias electric source for test purposes.
Technical scheme provided by the invention is: a kind of transformer DC magnetic bias electric source for test purposes, and its improvements are: described power supply comprises:
Direct current branch road: between the high pressure winding being connected on intermediate transformer and tested transformer, for generation of direct current, and be injected in the high pressure winding of described intermediate transformer and tested transformer;
Alternating current branch road: with described direct current branch circuit parallel connection, for providing AC load current path for described intermediate transformer and tested transformer, prevents the AC load electric current of intermediate transformer and tested transformer from flowing into described direct current branch road;
Protection branch road: with described direct current branch circuit parallel connection; for the protection of described direct current branch road; when preventing described alternating current branch road from breaking down, the high voltage of described intermediate transformer and tested transformer is applied on described direct current branch road, damages described direct current branch road.
Preferably, described direct current branch road comprises DC generator unit, and described DC generator unit comprises:
Alternating-current voltage source: its output is connected with the input of isolating transformer, for output AC electricity to described isolating transformer;
Isolating transformer: its output is connected with rectification circuit input end, exports rectification circuit to after the alternating current for exporting alternating-current voltage source carries out isolation transformation;
Rectification circuit: its output is connected with filter circuit input, the alternating current for being exported by isolating transformer exports filter circuit to after being converted to direct current;
Filter circuit: its output is connected with DC amplification circuit input, exports DC amplification circuit to after the direct current for exporting rectification circuit carries out filtering;
DC amplification circuit: its output is connected with secondary filtering electric capacity C2, for the direct current that filtering and amplifying circuit exports, and exports the direct current after amplifying to secondary filtering electric capacity C2;
Secondary filtering electric capacity C2: be connected with the high pressure winding of tested transformer with intermediate transformer, the direct current for exporting DC amplification circuit carries out the high pressure winding to intermediate transformer and tested transformer of output smoothing direct current after secondary filtering.
Further, control switch and fuse is also in series with between the output of described alternating-current voltage source and the input of described isolating transformer.
Further, described rectification circuit is the full bridge rectifier be constituted by a diode;
Described filter circuit comprises inductance L and electric capacity C1; Described DC amplification circuit comprises triode T;
One end of described inductance L connects one end of described electric capacity C1 and the collector electrode of institute triode T respectively, and its other end is connected with the output of rectification circuit; The other end of described electric capacity C1 connects another output of described rectification circuit and one end of described secondary filtering electric capacity C2 respectively; The other end of described secondary filtering electric capacity C2 is connected with the emitter of described triode T;
The base stage of described triode T is connected with portable computer by 485 stube cables; Described portable computer regulates the output current of direct current branch road by the current reference controlling described triode T.
Further, described direct current branch road also comprises the inductance unit with described DC generator units in series, for reducing the AC load electric current flowing into direct current branch road; One end of described inductance unit is connected with one end of secondary filtering electric capacity C2, and its other end is connected with the high pressure winding of tested transformer; The described other end of secondary filtering electric capacity C2 is connected with the high pressure winding of intermediate transformer.
Further, described inductance unit is dry reactor, and described dry reactor is made up of silicon steel plate core and the winding be wound on described silicon steel plate core; The through-flow electric current of permission of described inductance unit is 1.2 times of described direct current branch road maximum output current.
Preferably, described alternating current branch road is the capacitor box be made up of several thin-film capacitor connection in series-parallel; Whether the voltage and current precision of described capacitor box is electron type voltmeter and the ammeter measurement of 0.5 grade, break down with capacitor box described in Real-Time Monitoring; The through-flow electric current of permission of described capacitor box is greater than 1.5 times of nominal load current of tested transformer.
Preferably, described protection branch road comprises power supply, on-off controller, high-speed switch, zinc oxide valve plate group, current transformer; Described zinc oxide valve plate group is in parallel with described high-speed switch two ends; Described power supply connects and supplies power to described on-off controller, described current transformer detects the electric current flowing through described zinc oxide valve plate group, and the current value detected is sent to described on-off controller, described on-off controller controls conducting or the shutoff of described high-speed switch according to described current value.
Preferably, the low pressure winding of described intermediate transformer is connected with the output of generator, the high pressure winding parallel of its high pressure winding and described tested transformer; The low pressure winding open circuit of described tested transformer; Described power sources in series is in the high pressure winding shunt circuit of described intermediate transformer and described tested transformer.
Preferably, the low pressure winding of described intermediate transformer is connected with the output of generator with after the low pressure winding parallel of described tested transformer, one end ground connection after the high pressure winding parallel of its high pressure winding and described tested transformer; Described power sources in series is between the ground connection high pressure winding and the ground connection high pressure winding of tested transformer of described intermediate transformer.
Compared with immediate prior art, the present invention has following marked improvement:
The present invention adopts direct current branch road, alternating current branch road and protection branch road jointly to form transformer DC magnetic bias direct current power-supply system; the object being separated direct current and transformer alternating load current can be reached, and available protecting is carried out to direct current generator unit.Can realize the fine adjustment of DC experiment electric current, transformer DC magnetic bias test long-time stable carry out, can inject stable DC to Coefficients of Large Power Transformer Winding at single-phase or three-phase high-power transformer under unloaded and loading condition, the D.C. magnetic biasing reliably completing large-scale power transformer is tested.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of transformer DC magnetic bias electric source for test purposes provided by the invention;
Fig. 2 is the circuit theory diagrams of DC generator unit;
Fig. 3 is the circuit theory diagrams of protection branch road;
Fig. 4 is the D.C. magnetic biasing test loop schematic diagram under single-phase transformer idle condition;
Fig. 6 is the D.C. magnetic biasing test loop schematic diagram under three-phase transformer idle condition;
Fig. 5 is the D.C. magnetic biasing test loop schematic diagram under single-phase transformer loading condition;
Fig. 7 is the D.C. magnetic biasing test loop schematic diagram under three-phase transformer loading condition.
Wherein 1-DC generator unit; 2-inductance unit; 3-capacitor cell; 4-loop protection unit; 5-direct current branch road; 6-alternating current branch road; 7-protects branch road; 8-control switch; 9-fuse; 10-isolating transformer; 11-rectification circuit; 12-inductance L; 13-triode T; 14-electric capacity C1; 15-485 stube cable; 16-portable computer; 17-filter capacitor C2; 18-voltmeter; 19-ammeter; 20-on-off controller; 21-high-speed switch; 22-current transformer; 23-monolithic high energy ZnO valve block; 24-zinc oxide valve plate group; 25-generator; 26-generator loop protection unit; 27-intermediate transformer; The tested transformer of 28-; 29-power supply.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
In order to thoroughly understand the embodiment of the present invention, by following description, detailed structure is proposed.Obviously, the execution of the embodiment of the present invention is not limited to the specific details that those skilled in the art has the knack of.Preferred embodiment of the present invention is described in detail as follows, but except these are described in detail, the present invention can also have other execution modes.
The overall structure of transformer DC magnetic bias electric source for test purposes provided by the invention is as shown in Figure 1: described power supply 29 comprises:
Direct current branch road 5: the high pressure windings in series with intermediate transformer 27 and tested transformer 28, for generation of direct current, and is injected in the high pressure winding of described intermediate transformer 27 and tested transformer 28;
Alternating current branch road 6: in parallel with described direct current branch road 5, for providing AC load current path for described intermediate transformer 27 and tested transformer 28, prevent the AC load electric current of intermediate transformer 27 and tested transformer 28 from flowing into described direct current branch road 5;
Protection branch road 7: in parallel with described direct current branch road 5; for the protection of described direct current branch road 5; when preventing described alternating current branch road 6 from breaking down; the high voltage of described intermediate transformer 27 and tested transformer 28 is applied on described direct current branch road 5, damages described direct current branch road 5.
Described direct current branch road 5 comprises DC generator unit 1, and described DC generator unit 1 comprises:
Alternating-current voltage source: be 330V alternating-current voltage source, for DC generator unit 1 provides power, its output is connected with the input of isolating transformer 10, for output AC electricity to described isolating transformer 10;
Isolating transformer 10: its output is connected with rectification circuit 11 input, exports rectification circuit 11 to after the alternating current for exporting alternating-current voltage source carries out isolation transformation;
Rectification circuit 11: its output is connected with filter circuit input, the alternating current for being exported by isolating transformer 10 exports filter circuit to after being converted to direct current;
Filter circuit: its output is connected with DC amplification circuit input, exports DC amplification circuit to after the direct current for exporting rectification circuit 11 carries out filtering;
DC amplification circuit: its output is connected with secondary filtering electric capacity C217, for the direct current that filtering and amplifying circuit exports, and exports the direct current after amplifying to secondary filtering electric capacity C217;
Secondary filtering electric capacity C217: be connected with the high pressure winding of intermediate transformer 27 with tested transformer 28, the direct current for exporting DC amplification circuit carries out the high pressure winding to intermediate transformer 27 and tested transformer 28 of output smoothing direct current after secondary filtering.
Control switch 8 and fuse 9 is also in series with between the output of described alternating-current voltage source and the input of described isolating transformer 10.Described alternating-current voltage source exports 330V alternating current and inputs isolating transformer 10 through described control switch 8 and described fuse 9.
The full bridge rectifier 11 of described rectification circuit 11 for being constituted by a diode;
Described filter circuit comprises inductance L 12 and electric capacity C114; Described DC amplification circuit comprises triode T13;
One end of described inductance L 12 connects one end of described electric capacity C114 and the collector electrode of institute triode T13 respectively, and its other end is connected with the output of rectification circuit 11; The other end of described electric capacity C114 connects another output of described rectification circuit 11 and one end of described secondary filtering electric capacity C217 respectively; The other end of described secondary filtering electric capacity C217 is connected with the emitter of described triode T13;
The base stage of described triode T13 is connected with portable computer 16 by 485 stube cables 15; Described portable computer 16 regulates the output current of direct current branch road 5 by the current reference controlling described triode T13.
The voltage at described direct current generating unit two ends and output current adopt precision to be that the electron type voltmeter 18 of 0.5 grade and ammeter 19 carry out monitoring and showing.
Described direct current branch road 5 also comprises the inductance unit 2 of connecting with described DC generator unit 1, for reducing the AC load electric current flowing into direct current branch road 5; One end of described inductance unit 2 is connected with one end of secondary filtering electric capacity C217, and its other end is connected with the high pressure winding of tested transformer 28; The other end of described secondary filtering electric capacity C217 is connected with another high pressure winding of intermediate transformer 27.
Described inductance unit 2 is dry reactor, and described dry reactor is made up of silicon steel plate core and the winding be wound on described silicon steel plate core; Its capacity is enough large, can guarantee inductance unit 2 for a long time by 1.2 times of electric currents of the maximum output direct current of direct current generator unit.Whether described inductance unit 2 adopts precision to be the alternating voltage that the electron type voltmeter 18 of 0.5 grade and ammeter 19 show inductance unit 2 two ends and the alternating current passed through, break down with Real-Time Monitoring inductance unit 2.Described alternating current branch road 6 is the capacitor box be made up of several thin-film capacitor connection in series-parallel; Whether the voltage and current precision of described capacitor box is that the electron type voltmeter 18 of 0.5 grade and ammeter 19 are measured, break down with capacitor box described in Real-Time Monitoring;
Little at least 2 orders of magnitude of impedance of the impedance ratio inductance unit 2 of described capacitor cell 3, and it allows the through-flow 1.5 times of nominal load current being greater than tested transformer 28 for a long time.
Described protection branch road 7 comprises power supply 29, on-off controller 20, high-speed switch 21, zinc oxide valve plate group 24, current transformer 22; Described zinc oxide valve plate group 24 is in parallel with described high-speed switch 21 two ends; Described zinc oxide valve plate group 24 is composed in parallel successively by monolithic high energy ZnO valve block 23; Described zinc oxide valve plate group 24 residual voltage is less than the maximum withstand voltage of DC generator unit 1, the long-term through-flow electric current that high-speed switch 21 allows is greater than 1.5 times of nominal load current of tested transformer 28, and the ON time of high-speed switch 21 is less than zinc oxide valve plate group 24 allows throughput time 1/5.
On-off controller 20 provides power by 220V power supply 29, to drive high-speed switch 21 conducting.When experiment power supply 29 system adopting the present invention to propose carries out D.C. magnetic biasing test to high-power transformer, if there is capacitor cell 3 to open a way in process of the test, the high pressure of tested transformer 28 can all be applied on DC generator unit 1 and capacitor cell 3, causes DC generator unit 1 and capacitor cell 3 damage and cause personal security problem.Can when there is above-mentioned fault in described protection branch road 7; by zinc oxide valve plate group 24 conducting; make transformer load electric current all by zinc oxide valve plate group 24, and instantaneously the voltage at DC generator unit 1 two ends is down to zinc oxide valve plate group 24 residual voltage (residual voltage of zinc oxide valve plate group 24 is less than the maximum withstand voltage of DC generator unit 1).Because zinc oxide valve plate group 24 can only pass through transformer load electric current (allowing throughput time to be usually less than 1s) in short-term; therefore while the relay protective scheme protecting branch road 7 to arrange is zinc oxide valve plate group 24 conducting; by current transformer 22 sensed current signal; and by this current signal transfer to on-off controller 20, control high-speed switch 21 conducting (ON time of high-speed switch 21 is less than 100ms usually) by on-off controller 20.After high-speed switch 21 conducting, because high-speed switch 21 conducting resistance is little, transformer load electric current can be transferred to high-speed switch 21 loop instantaneously from zinc oxide valve plate group 24, realizes the through-flow for a long time of transformer load electric current by high-speed switch 21.
As shown in accompanying drawing 4 and Fig. 5, accompanying drawing 4 is the D.C. magnetic biasing test schematic diagram under application the invention process single phase power transformer idle condition, and accompanying drawing 5 is the D.C. magnetic biasing test schematic diagram under application the invention process three-phase power transformer idle condition.The low pressure winding of described intermediate transformer 27 is connected with the output of generator 25, the high pressure winding parallel of its high pressure winding and described tested transformer 28; The low pressure winding open circuit of described tested transformer 28; Described power supply 29 is connected on described intermediate transformer 27 with the high pressure winding shunt circuit of described tested transformer 28, is injected into by direct current in the high pressure winding of two transformers, carries out the D.C. magnetic biasing test of transformer.
As shown in accompanying drawing 6 and Fig. 7, accompanying drawing 6 is the D.C. magnetic biasing test schematic diagram under application the invention process single phase power transformer loading condition, and accompanying drawing 7 is the D.C. magnetic biasing test schematic diagram under application the invention process three-phase power transformer loading condition.The low pressure winding of described intermediate transformer 27 is connected with the output of generator 25 with after the low pressure winding parallel of described tested transformer 28, one end ground connection after the high pressure winding parallel of its high pressure winding and described tested transformer 28; Described power supply 29 is connected between the ground connection high pressure winding of described intermediate transformer 27 and the ground connection high pressure winding of described tested transformer 28, is injected into by direct current in the high pressure winding of two transformers, carries out the D.C. magnetic biasing test of transformer.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; although with reference to above-described embodiment to invention has been detailed description; those of ordinary skill in the field still can modify to the specific embodiment of the present invention or equivalent replacement; these do not depart from any amendment of spirit and scope of the invention or equivalent replacement, are all applying within the claims awaited the reply.
Claims (10)
1. a transformer DC magnetic bias electric source for test purposes, is characterized in that: described power supply comprises:
Direct current branch road: between the high pressure winding being connected on intermediate transformer and tested transformer, for generation of direct current, and be injected in the high pressure winding of described intermediate transformer and tested transformer;
Alternating current branch road: with described direct current branch circuit parallel connection, for providing AC load current path for described intermediate transformer and tested transformer, prevents the AC load electric current of intermediate transformer and tested transformer from flowing into described direct current branch road;
Protection branch road: with described direct current branch circuit parallel connection; for the protection of described direct current branch road; when preventing described alternating current branch road from breaking down, the high voltage of described intermediate transformer and tested transformer is applied on described direct current branch road, damages described direct current branch road.
2. a kind of transformer DC magnetic bias electric source for test purposes according to claim 1, is characterized in that:
Described direct current branch road comprises DC generator unit, and described DC generator unit comprises:
Alternating-current voltage source: its output is connected with the input of isolating transformer, for output AC electricity to described isolating transformer;
Isolating transformer: its output is connected with rectification circuit input end, exports rectification circuit to after the alternating current for exporting alternating-current voltage source carries out isolation transformation;
Rectification circuit: its output is connected with filter circuit input, the alternating current for being exported by isolating transformer exports filter circuit to after being converted to direct current;
Filter circuit: its output is connected with DC amplification circuit input, exports DC amplification circuit to after the direct current for exporting rectification circuit carries out filtering;
DC amplification circuit: its output is connected with secondary filtering electric capacity C2, for the direct current that filtering and amplifying circuit exports, and exports the direct current after amplifying to secondary filtering electric capacity C2;
Secondary filtering electric capacity C2: be connected with the high pressure winding of tested transformer with intermediate transformer, the direct current for exporting DC amplification circuit carries out the high pressure winding to intermediate transformer and tested transformer of output smoothing direct current after secondary filtering.
3. a kind of transformer DC magnetic bias electric source for test purposes according to claim 2, is characterized in that:
Control switch and fuse is also in series with between the output of described alternating-current voltage source and the input of described isolating transformer.
4. a kind of transformer DC magnetic bias electric source for test purposes according to claim 2, is characterized in that:
Described rectification circuit is the full bridge rectifier be constituted by a diode;
Described filter circuit comprises inductance L and electric capacity C1; Described DC amplification circuit comprises triode T;
One end of described inductance L connects one end of described electric capacity C1 and the collector electrode of institute triode T respectively, and its other end is connected with the output of rectification circuit; The other end of described electric capacity C1 connects another output of described rectification circuit and one end of described secondary filtering electric capacity C2 respectively; The other end of described secondary filtering electric capacity C2 is connected with the emitter of described triode T;
The base stage of described triode T is connected with portable computer by 485 stube cables; Described portable computer regulates the output current of direct current branch road by the current reference controlling described triode T.
5. a kind of transformer DC magnetic bias electric source for test purposes according to claim 2, is characterized in that:
Described direct current branch road also comprises the inductance unit with described DC generator units in series, for reducing the AC load electric current flowing into direct current branch road; One end of described inductance unit is connected with one end of secondary filtering electric capacity C2, and its other end is connected with the high pressure winding of tested transformer; The described other end of secondary filtering electric capacity C2 is connected with the high pressure winding of intermediate transformer.
6. a kind of transformer DC magnetic bias electric source for test purposes according to claim 5, is characterized in that:
Described inductance unit is dry reactor, and described dry reactor is made up of silicon steel plate core and the winding be wound on described silicon steel plate core; The through-flow electric current of permission of described inductance unit is 1.2 times of described direct current branch road maximum output current.
7. a kind of transformer DC magnetic bias electric source for test purposes according to claim 1, is characterized in that:
Described alternating current branch road is the capacitor box be made up of several thin-film capacitor connection in series-parallel; Whether the voltage and current precision of described capacitor box is electron type voltmeter and the ammeter measurement of 0.5 grade, break down with capacitor box described in Real-Time Monitoring; The through-flow electric current of permission of described capacitor box is greater than 1.5 times of nominal load current of tested transformer.
8. a kind of transformer DC magnetic bias electric source for test purposes according to claim 1, is characterized in that:
Described protection branch road comprises power supply, on-off controller, high-speed switch, zinc oxide valve plate group, current transformer; Described zinc oxide valve plate group is in parallel with described high-speed switch two ends; Described power supply connects and supplies power to described on-off controller, described current transformer detects the electric current flowing through described zinc oxide valve plate group, and the current value detected is sent to described on-off controller, described on-off controller controls conducting or the shutoff of described high-speed switch according to described current value.
9. a kind of transformer DC magnetic bias electric source for test purposes according to claim 1, is characterized in that:
The low pressure winding of described intermediate transformer is connected with the output of generator, the high pressure winding parallel of its high pressure winding and described tested transformer; The low pressure winding open circuit of described tested transformer; Described power sources in series is in the high pressure winding shunt circuit of described intermediate transformer and described tested transformer.
10. a kind of transformer DC magnetic bias electric source for test purposes according to claim 1, is characterized in that:
The low pressure winding of described intermediate transformer is connected with the output of generator with after the low pressure winding parallel of described tested transformer, one end ground connection after the high pressure winding parallel of its high pressure winding and described tested transformer; Described power sources in series is between the ground connection high pressure winding and the ground connection high pressure winding of tested transformer of described intermediate transformer.
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| CN201510900346.1A CN105450007A (en) | 2015-12-09 | 2015-12-09 | Power supply for direct current magnetic biasing tests on transformers |
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| CN201510900346.1A CN105450007A (en) | 2015-12-09 | 2015-12-09 | Power supply for direct current magnetic biasing tests on transformers |
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| CN107870270A (en) * | 2016-09-27 | 2018-04-03 | 广州西门子变压器有限公司 | Direct current magnetic bias test equipment of transformer |
| CN109036812A (en) * | 2017-06-12 | 2018-12-18 | 天津市中力神盾电子科技有限公司 | current collecting device |
| CN112816906A (en) * | 2020-12-28 | 2021-05-18 | 国电南瑞科技股份有限公司 | Distribution network direct-current transformer medium-voltage side bipolar short-circuit test platform and method |
| CN113447734A (en) * | 2020-03-25 | 2021-09-28 | 许继集团有限公司 | DC magnetic bias injection test device |
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| CN104319733A (en) * | 2014-08-01 | 2015-01-28 | 国家电网公司 | Neutral point grounding impedance device of transformer and multipurpose direct current magnetic bias protection method of impedance device |
| CN104330662A (en) * | 2014-10-23 | 2015-02-04 | 中国南方电网有限责任公司电网技术研究中心 | Testing device and testing method for direct-current magnetic bias of converter transformer |
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| CN107870270A (en) * | 2016-09-27 | 2018-04-03 | 广州西门子变压器有限公司 | Direct current magnetic bias test equipment of transformer |
| CN109036812A (en) * | 2017-06-12 | 2018-12-18 | 天津市中力神盾电子科技有限公司 | current collecting device |
| CN109036812B (en) * | 2017-06-12 | 2024-04-12 | 天津市中力神盾电子科技有限公司 | Current acquisition device |
| CN113447734A (en) * | 2020-03-25 | 2021-09-28 | 许继集团有限公司 | DC magnetic bias injection test device |
| CN113447734B (en) * | 2020-03-25 | 2024-04-12 | 许继集团有限公司 | DC magnetic bias current injection test device |
| CN112816906A (en) * | 2020-12-28 | 2021-05-18 | 国电南瑞科技股份有限公司 | Distribution network direct-current transformer medium-voltage side bipolar short-circuit test platform and method |
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