CN205608139U - Change of current becomes partial discharge test device - Google Patents

Change of current becomes partial discharge test device Download PDF

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Publication number
CN205608139U
CN205608139U CN201620310654.9U CN201620310654U CN205608139U CN 205608139 U CN205608139 U CN 205608139U CN 201620310654 U CN201620310654 U CN 201620310654U CN 205608139 U CN205608139 U CN 205608139U
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China
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frequency power
change
variable
current
power sources
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CN201620310654.9U
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Chinese (zh)
Inventor
刘光祺
邹德旭
颜冰
钱国超
王科
刘红文
彭晶
徐肖伟
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云南电网有限责任公司电力科学研究院
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Priority to CN201620310654.9U priority Critical patent/CN205608139U/en
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Publication of CN205608139U publication Critical patent/CN205608139U/en

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Abstract

The embodiment of the utility model discloses change of current becomes partial discharge test device, adopt two variable frequency power supply and two excitation transformer structure, be that variable frequency power supply includes a variable frequency power supply and the 2nd variable frequency power supply through the parallel control line connection, a parallel control line traffic control variable frequency power supply and the 2nd variable frequency power supply output phase synchronization, the alternating current that the frequency is unanimous, the synchronizing voltage of output, the electric current carries out the scalar stack in the test circuit, after the excitation transformer steps up, for becoming, the change of current of awaiting measuring provides required high voltage of partial discharge test and heavy current. The utility model provides a change of current becomes partial discharge test device when satisfying large capacity, high voltage, dwindles its volume, reduces its cost, facilitates for on -the -spot partial discharge test. In addition, through the wiring of adjustment test circuit, can realize two kinds of test duty, the angle joint change of current promptly becomes the two variable frequency power supply symmetry pressurization modes of partial discharge test and connects the change of current to become the two unilateral pressurization modes of variable frequency power supply of partial discharge test with the star.

Description

A kind of change of current changed situation puts assay device

Technical field

This utility model relates to High-Voltage Experimentation Technology field, particularly relates to a kind of change of current changed situation and puts assay device.

Background technology

D.C. high voltage transmission is a kind of direct current transportation mode high-power, remote, make use of stable DC without induction reactance, nothing The advantage synchronized, has the characteristics such as running wastage is little, circuit cost is low, line corridor is narrow, is therefore particularly suitable for long distance From, large capacity transmission, there is boundary Anhui ± 1100 kilovolt high voltage DC engineering etc. in current China building large-sized DC power transmission engineering.

Converter power transformer, as in a high voltage direct current transmission project indispensable equipment, connects converter valve and AC system (winding that converter power transformer is connected with AC system is referred to as the change of current and becomes source side winding, and the change of current becomes source side winding two outlets End, is set to the change of current respectively and becomes source side winding head end and change of current change source side winding tail end;Converter power transformer is connected with converter valve Winding is referred to as converter transformer valve side winding, and converter transformer valve side winding has two leading-out terminals, is set to converter transformer valve side winding respectively first End and converter transformer valve side winding tail end), it is achieved electric energy biography from AC system to inverter or from inverter to AC system Defeated, its running status directly affects safety and the stability of HVDC transmission system.Thus, it is ensured that HVDC Transmission system is long-term, reliability service, and converter power transformer is carried out partial discharge test is requisite.

Compared with conventional AC transformator, the capacity of converter power transformer is big and structure is complicated, the electricity of tradition local discharge test device Source capacity and output voltage are difficult to meet the local discharge test demand of converter power transformer.In prior art, use more capacity Variable-frequency power sources, the mode of exciting transformer of higher voltage grade improve power supply capacity and output voltage, but, add Experimentation cost, also results in local discharge test device volume excessive simultaneously, when carrying out on-the-spot local discharge test, affects local discharge test The transport of device and the selection of test site.

Therefore, the change of current changed situation that a kind of power supply capacity is big, output voltage is high and economic, portable is put assay device and is urgently occurred.

Utility model content

This utility model embodiment provides a kind of change of current changed situation and puts assay device, to solve change of current changed situation in prior art The power supply capacity putting assay device is big, output voltage is high with the problem that can not have concurrently economic, portable simultaneously.

In order to solve above-mentioned technical problem, this utility model embodiment discloses following technical scheme:

A kind of change of current changed situation puts assay device, and including variable-frequency power sources and exciting transformer, the input of described variable-frequency power sources is used In connecting three-phase alternating current, the outfan of described variable-frequency power sources electrically connects with the input of exciting transformer, described variable-frequency electric The alternating current that source output frequency is controlled, and transported to described exciting transformer;

Described variable-frequency power sources is double variable-frequency power sources, specifically, described variable-frequency power sources includes the first variable-frequency power sources and the second frequency conversion Power supply, described first variable-frequency power sources and described second variable-frequency power sources control line in parallel connect, by described Parallel Control The alternating current that first variable-frequency power sources described in line traffic control exports Phase synchronization with described second variable-frequency power sources, frequency is consistent;

The outfan of described exciting transformer connects a parallel circuit, and described variable-frequency power sources is exported by described exciting transformer AC conversion is High Level AC Voltage;

Described parallel circuit includes dividing potential drop branch road and the compensation branch road of parallel connection;

Change of current changed situation is put assay device and is also included a PD meter, and value is put in the office become for detecting the change of current to be measured.

Preferably, described exciting transformer includes the first exciting transformer and the second exciting transformer, described first excitation-transformation variable Depressor is connected with described second exciting transformer reversed polarity;Described parallel circuit includes the first parallel circuit and the second electricity in parallel Road;

The input of described first variable-frequency power sources is used for connecting three-phase alternating current, the outfan of described first variable-frequency power sources and institute Stating the low-pressure side electrical connection of the first exciting transformer, the high-pressure side polar end of described first exciting transformer is used for connecting to be measured Converter transformer valve side winding head end, the high-pressure side non-polar end ground connection of described first exciting transformer;Described first parallel circuit Head end be used for connecting described converter transformer valve side winding head end to be measured, the tail end ground connection of described first parallel circuit;

The input of described second variable-frequency power sources is used for connecting three-phase alternating current, the outfan of described second variable-frequency power sources and institute Stating the low-pressure side electrical connection of the second exciting transformer, the high-pressure side non-polar end of described second exciting transformer is treated for connection Survey converter transformer valve side winding tail end, the high-pressure side polar end ground connection of described second exciting transformer;Described second parallel circuit Head end be used for connecting described converter transformer valve side winding tail end to be measured, the tail end ground connection of described second parallel circuit;

Described change of current changed situation is put assay device and is also included a net side voltage-dividing capacitor, and the head end of described net side voltage-dividing capacitor is used Source side winding head end, the tail end ground connection of the head end of net side voltage-dividing capacitor is become in connecting the described change of current to be measured;

Value is put in the office that described PD meter becomes for detecting the described change of current to be measured.

Preferably, the outfan of described first variable-frequency power sources and described second variable-frequency power sources is simultaneously connected with described first excitation-transformation variable The low-pressure side of depressor, the high-pressure side polar end of described first exciting transformer is connected with the head end of described first parallel circuit, The high-pressure side non-polar end of described first exciting transformer is connected with the tail end of described first parallel circuit, and described first is in parallel The head end of circuit is used for connecting described converter transformer valve side winding head end to be measured, the tail end ground connection of described first parallel circuit;

Described change of current changed situation is put assay device and is also included a net side voltage-dividing capacitor, and the head end of described net side voltage-dividing capacitor is used Source side winding head end, the tail end ground connection of described net side voltage-dividing capacitor is become in connecting the described change of current to be measured;

Value is put in the office that described PD meter becomes for detecting the change of current to be measured.

Preferably, in described PD meter, it is provided with detection impedance, the office become by the change of current to be measured described in described detection impedance detection Put value.

Preferably, being provided with voltmeter in described dividing potential drop branch road, shown voltmeter is for the magnitude of voltage of experiment with measuring circuit.By Above technical scheme is visible, and a kind of change of current changed situation that this utility model embodiment provides is put assay device and used double variable-frequency power sources Structure, a Large Copacity variable-frequency power sources will change and be set to two low capacity variable-frequency power sources, and control line connects two in parallel Low capacity variable-frequency power sources, Parallel Control line can control two variable-frequency power sources and export synchronizing voltage in hookup, synchronize electricity Being pressed in hookup and carry out scalar superposition, becoming for the change of current to be measured provides the high voltage needed for local discharge test and big electric current.With Time, compared to a jumbo variable-frequency power sources, the variable-frequency power sources of two low capacities has less volume and preferably Price, is therefore substantially reduced change of current changed situation and puts the volume of assay device, reduce its experimentation cost.

Accompanying drawing explanation

In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will to embodiment or In description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, for ordinary skill people For Yuan, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 puts the structural representation of assay device for a kind of change of current changed situation that this utility model embodiment provides;

Fig. 2 is the circuit diagram of a kind of antiresonant circuit;

Fig. 3 becomes the double variable-frequency power sources symmetry pressuring method of local discharge test for a kind of corner connection change of current that this utility model embodiment provides Circuit diagram;

Fig. 4 connects the change of current for a kind of star that this utility model embodiment provides and becomes the double monolateral pressuring method of variable-frequency power sources of local discharge test Circuit diagram;

Symbol table in Fig. 1-4 is shown as: P-variable-frequency power sources, P1-the first variable-frequency power sources, and P2-the second variable-frequency power sources, T-encourages Magnetic transformer, T1-the first exciting transformer, T2-the second exciting transformer, R-parallel circuit, R1-the first parallel circuit, R2-the second parallel circuit, C1-the first voltage-dividing capacitor, C2-the second voltage-dividing capacitor, C3-the 3rd voltage-dividing capacitor, C4- 4th voltage-dividing capacitor, C5-the 5th voltage-dividing capacitor, C6-the 6th voltage-dividing capacitor, L1-the first compensation reactor, L2- Second compensation reactor, L3-the 3rd compensation reactor, V1-the first voltmeter, V2-the second voltmeter, V3-tertiary voltage Table, M-PD meter, Zm-detects impedance, and the G-change of current to be measured becomes, and Gv1-converter transformer valve side to be measured winding head end, Gv2-is to be measured Converter transformer valve side winding tail end, Ge1-source side winding head end, Ge2-source side winding tail end, C0-the change of current to be measured becomes equivalent capacity, L0-compensate inductance.

Detailed description of the invention

For the technical scheme making those skilled in the art be more fully understood that in this utility model, below in conjunction with this practicality Accompanying drawing in new embodiment, is clearly and completely described the technical scheme in this utility model embodiment, it is clear that Described embodiment is only a part of embodiment of this utility model rather than whole embodiments.New based on this practicality Embodiment in type, the every other reality that those of ordinary skill in the art are obtained under not making creative work premise Execute example, all should belong to the scope of this utility model protection.

In order to solve Large Copacity in prior art, that the change of current changed situation of high output voltage puts assay device volume is excessive, is carrying out During on-the-spot local discharge test, the problem being not easy to delivery, it is double that this utility model provides a kind of change of current changed situation to put assay device employing Variable-frequency power sources structure, will existing change of current changed situation put a Large Copacity variable-frequency power sources in assay device be replaced into two less Capacity variable-frequency power sources.Compared to a jumbo variable-frequency power sources, the variable-frequency power sources of two low capacities has less volume With price preferably, therefore can be greatly reduced change of current changed situation and put the volume of assay device and reduce experimentation cost.With Time, control line controls two low capacity variable-frequency power sources output synchronizing voltages in parallel, and the synchronizing voltage of output is in circuit Carrying out scalar superposition, becoming for the change of current to be measured provides the high voltage needed for discharge test and big electric current.

Fig. 1 puts the structural representation of assay device for a kind of change of current changed situation that this utility model embodiment provides, such as Fig. 1 institute Variable-frequency power sources P input connects three-phase alternating current, and variable-frequency power sources P outfan connects exciting transformer T.Variable-frequency power sources P Three-phase alternating current (such as AC380V/50Hz) is converted into the sine wave alternating current of waveform stabilization, and variable-frequency power sources P is adjustable The frequency of control sine wave alternating current.Variable-frequency power sources P includes the first variable-frequency power sources P1 and the second variable-frequency power sources P2, and first becomes Frequency power P1 and the second variable-frequency power sources P2 control line in parallel connect, Parallel Control line traffic control the first variable-frequency power sources P1 with Second variable-frequency power sources P2 output frequency voltage identical, phase locked.In embodiment of the present utility model, the first frequency conversion Power supply P1 and the second variable-frequency power sources P2 have identical structure and equivalent capability.

Variable-frequency power sources P is exported by variable-frequency power sources P by sine wave alternating current transmission to exciting transformer T, exciting transformer T Sine wave alternating current is converted into the High Level AC Voltage needed for local discharge test.

It is in parallel that parallel circuit R becomes G with the change of current to be measured, and parallel circuit R includes dividing potential drop branch road and the compensation branch road of parallel connection.

For flowing through the capacitance current that the change of current to be measured becomes, the capacity requirement reducing variable-frequency power sources under complementation test voltage, in test Circuit accesses compensation reactor.Fig. 2 is the circuit diagram of a kind of antiresonant circuit, as in figure 2 it is shown, in high frequency, It is capacitive that the change of current to be measured becomes G, and can regard as is an electric capacity, is designated as the change of current to be measured and becomes equivalent capacity C0;Compensation reactor is one Inductance, is designated as compensating inductance L0, therefore, compensation reactor becomes G formation in parallel resonance with the change of current to be measured.Pass through variable-frequency electric The frequency of alternating current in source P regulation hookup, when in hookup, ac frequency reaches resonant frequency, test electricity There is parallel resonance in road, now, flows through compensation inductance L0Equivalent capacity C is become with the change of current to be measured0Current phase contrary, mutually Offset, make the output electric current of variable-frequency power sources P minimize value.Wherein, the resonant frequency of antiresonant circuit is

f 0 = 1 2 π L C ,

Wherein, f0For resonant frequency, L is the induction reactance of compensation reactor, and C is the capacitive reactance that the change of current to be measured becomes equivalent capacity.

Voltage-dividing capacitor two ends electrically connect a voltmeter, voltmeter voltage in experiment with measuring circuit.

Value is put in the office becoming G for detecting the change of current to be measured, and change of current changed situation is put assay device and also included a PD meter M, PD meter M Become G with the change of current to be measured to electrically connect.In enforcement of the present utility model, it is provided with detection impedance Z m in PD meter M, by inspection Survey impedance Z m and gather the local discharge signal of the change of current to be measured change G.

The change of current changed situation using embodiment to provide puts assay device exchange rheology when carrying out innings discharge test, can change according to be measured The test voltage of rheology G, selects suitable test method, such as, if the test voltage that the change of current to be measured becomes G is higher ranked, When the output voltage of one exciting transformer can not realize, then select the corner connection change of current to become the double variable-frequency power sources symmetry of local discharge test and add Pressure mode, particularly as follows: use two exciting transformers to apply voltage in converter transformer valve side two ends to be measured symmetry, reduces every The output voltage of exciting transformer.If the test voltage grade that the change of current to be measured becomes G is relatively low, then selects star to connect change of current changed situation and put The double monolateral pressuring method of variable-frequency power sources of test, particularly as follows: only with an exciting transformer in converter transformer valve side one end to be measured Apply voltage, converter transformer valve side other end ground connection.The conversion of two kinds of test methods is realized by the wiring of Adjustment Tests circuit.

Fig. 3 becomes the double variable-frequency power sources symmetry pressuring method of local discharge test for a kind of corner connection change of current that this utility model embodiment provides Circuit diagram, as it is shown on figure 3, the corner connection change of current becomes the double variable-frequency power sources symmetry pressuring method of local discharge test includes double variable-frequency power sources With double exciting transformers, specifically, variable-frequency power sources P includes the first variable-frequency power sources P1 and the second variable-frequency power sources P2, first Variable-frequency power sources P1 and the second variable-frequency power sources P2 control line in parallel connect, Parallel Control line traffic control the first variable-frequency power sources P1 Phase synchronization is kept with the alternating current of the second variable-frequency power sources P2 output.Exciting transformer T includes the first exciting transformer T1 Connect with the second exciting transformer T2, the first exciting transformer T1 and the second exciting transformer T2 reversed polarity, export amplitude Unanimously, the voltage of phase 180 °.

Parallel circuit R includes the first parallel circuit R1 and the second parallel circuit R2.

First variable-frequency power sources P1 and the second variable-frequency power sources P2 input are all connected with three-phase alternating current, the first variable-frequency power sources P1 The low-pressure side electrical connection of outfan and the first exciting transformer T1;Second variable-frequency power sources P2 and the second exciting transformer T2 Low-pressure side electrical connection.First variable-frequency power sources P1 and the second variable-frequency power sources P2 control line in parallel connect, Parallel Control line Control the first variable-frequency power sources P1 and the second variable-frequency power sources P2 output frequency alternating current identical, phase locked.First excitation Transformator T1 high-pressure side polar end is connected with converter transformer valve side winding head end Gv1 to be measured, the first exciting transformer T1 high pressure Side non-polar end ground connection;Second exciting transformer T2 high-pressure side non-polar end and converter transformer valve side winding tail end Gv2 to be measured Connect, the second exciting transformer T2 high-pressure side polar end ground connection.First exciting transformer T1 and the second exciting transformer T2 Consistent, the High Level AC Voltage of phase 180 ° to the change of current to be measured change G output amplitude.Outside first parallel circuit R1 head end Converter transformer valve side winding head end Gv1, the first parallel circuit R1 tail end ground connection are surveyed in reception;Outside second parallel circuit R2 head end Converter transformer valve side winding tail end Gv2, the second parallel circuit R2 tail end ground connection are surveyed in reception.

First parallel circuit R1 includes the first compensation branch road, and first compensates branch road includes the first compensation reactor L1, puts in office During test, by the frequency of alternating current in regulation hookup, hookup is made to be in parallel resonance condition.

In order to measure the magnitude of voltage of the High Level AC Voltage of the first exciting transformer T1 output, increase in the first parallel circuit R1 If with the first the first dividing potential drop branch road compensating branch circuit parallel connection, the first dividing potential drop branch road includes the first voltage-dividing capacitor C1 of series connection It is terminated with voltmeter V1, the electricity measured according to voltmeter V1 with the second voltage-dividing capacitor C2, the second voltage-dividing capacitor C2 two Pressure value, utilizes voltage division formulas to calculate the voltage swing of the first exciting transformer T1 output.

Second parallel circuit R2 includes the second compensation branch road, and second compensates branch road includes the second compensation reactor L2, and office puts During test, by the frequency of alternating current in regulation hookup, hookup is made to be in parallel resonance condition.

In order to measure the magnitude of voltage of the High Level AC Voltage of the second exciting transformer T2 output, increase in the second parallel circuit R2 If with the second the second dividing potential drop branch road compensating branch circuit parallel connection, the second dividing potential drop branch road includes the 3rd voltage-dividing capacitor C3 of series connection It is terminated with voltmeter V2, the electricity measured according to voltmeter V2 with the 4th voltage-dividing capacitor C4, the 4th voltage-dividing capacitor C4 two Pressure value, calculates the voltage swing of the second exciting transformer T2 output.

The measured value measured according to voltmeter V1 and voltmeter V2, calculates the first exciting transformer T1 and the second excitation-transformation variable The voltage swing of depressor T2 output, thus obtain being applied to the voltage swing of converter transformer valve side to be measured.

The net side external change of current to be measured of voltage-dividing capacitor head end becomes source side winding head end Ge1, nets side voltage-dividing capacitor head end and treats Survey converter transformer valve side winding tail end Gv2 ground connection.In the present embodiment, net side voltage-dividing capacitor includes the 5th dividing potential drop electricity of series connection Container C5 and the 6th voltage-dividing capacitor C6, the 6th voltage-dividing capacitor C6 two are terminated with voltmeter V3, according to by voltmeter V3 The magnitude of voltage measured, calculates the change of current and becomes voltage on line side value.

The monitoring passage of PD meter respectively with converter transformer valve side winding head end Gv1 to be measured, winding tail end Gv2 and source side winding Head end Ge1 connects, and value is put in the office become for detecting the change of current to be measured.

Before using, the test voltage of the no-load voltage ratio estimation exciting transformer T output that can become according to the change of current to be measured, such as, the change of current Becoming net side rated voltage is 525kV, and converter transformer valve side rated voltage is 210kV, then the change of current become no-load voltage ratio into:

( 525 / 3 ) / ( 210 ) = 1.44 ,

If test requirements document net side test voltage is:

1.5 U m / 3 = 1.5 × 550 / 3 = 476 k V ,

Wherein, it is 550kV that the change of current to be measured becomes ceiling voltage Um properly functioning for G, then converter transformer valve side test voltage is:

476/1.44=331kV,

It is the test voltage that exciting transformer T should export in local discharge test.

The corner connection change of current using the present embodiment to provide becomes local discharge test double variable-frequency power sources symmetry pressuring method exchange rheology and carries out Partial Discharge Detection, first becomes the change of current to be measured G access change of current changed situation and puts in assay device, be specially as follows: the change of current to be measured Become valve side winding head end Gv1 and the first exciting transformer T1 high-pressure side polar end connects, converter transformer valve side winding tail end to be measured Gv2 and the second exciting transformer T2 high-pressure side polar end connect, and the change of current to be measured becomes source side winding head end Ge1 and net side dividing potential drop Capacitor head end connects, and the change of current to be measured becomes source side winding tail end Ge2 ground connection.Meanwhile, converter transformer valve side winding head end to be measured Gv1, winding tail end and source side winding head end Ge1 are connected with the monitoring passage of PD meter respectively.After to be accessed, change to be measured Rheology G input test voltage, value is put in the office detecting the change of current to be measured change G.

Fig. 4 connects the change of current for a kind of star that this utility model embodiment provides and becomes the double monolateral pressuring method of variable-frequency power sources of local discharge test Circuit diagram, as shown in Figure 4, star connects the change of current and becomes the double monolateral pressuring method of variable-frequency power sources of local discharge test and include double variable-frequency power sources, Specifically, the first variable-frequency power sources P1 and the second variable-frequency power sources P2 outfan are simultaneously connected with the low pressure of the first exciting transformer T1 Side, the first exciting transformer T1 high-pressure side polar end and the first parallel circuit R1 head end are connected, the first exciting transformer T1 High-pressure side non-polar end and the first parallel circuit R1 tail end are connected, the first external converter transformer valve to be measured of parallel circuit R1 head end Side winding head end Gv1, the first parallel circuit R1 tail end ground connection, converter transformer valve side winding tail end Gv2 ground connection to be measured.

First parallel circuit R1 includes the first compensation branch road and the first dividing potential drop branch road of parallel connection.First compensates branch road includes the One compensation reactor L1, by the frequency of alternating current in regulation hookup, makes circuit be in parallel resonance condition.First Dividing potential drop branch road includes the first voltage-dividing capacitor C1 and the second voltage-dividing capacitor C2, the second voltage-dividing capacitor C2 two ends of series connection It is connected to voltmeter V1, according to the magnitude of voltage measured by voltmeter V1, calculates converter transformer valve side magnitude of voltage.

The net side external change of current to be measured of voltage-dividing capacitor head end becomes source side winding head end Ge1, nets side voltage-dividing capacitor tail end ground connection, Net side voltage-dividing capacitor includes the 5th voltage-dividing capacitor C5 and the 6th voltage-dividing capacitor C6, the 6th voltage-dividing capacitor of series connection C6 two is terminated with voltmeter V3, according to the magnitude of voltage measured by voltmeter V3, calculates the change of current and becomes voltage on line side value.

The monitoring passage of described PD meter connects converter transformer valve side winding head end Gv1 to be measured and source side winding head end respectively Ge1, puts value for detecting the office of converter transformer valve side winding head end Gv1 and source side winding head end Ge1 to be measured.

Before using, the test voltage of the no-load voltage ratio estimation exciting transformer T output of G can be become according to the change of current to be measured, such as, change Rheology net side rated voltage is 525kV, and converter transformer valve side rated voltage is 210kV, then the change of current become no-load voltage ratio into:

( 525 / 3 ) / ( 210 / 3 ) = 2.5 ,

If test requirements document net side test voltage is:

1.5 U m / 3 = 1.5 × 550 / 3 = 476 k V ,

Wherein, it is 550kV that the change of current to be measured becomes ceiling voltage Um properly functioning for G, then converter transformer valve side test voltage is:

476/2.5=190kV,

It is the test voltage that exciting transformer T should export in local discharge test.

The star using the present embodiment to provide connects change of current change local discharge test double variable-frequency power sources monolateral pressuring method exchange rheology to be carried out Partial Discharge Detection, first becomes the change of current to be measured G access change of current changed situation and puts in assay device, be specially as follows: the change of current to be measured Become valve side winding head end Gv1 and the first exciting transformer T1 high-pressure side polar end connects, converter transformer valve side winding tail end to be measured Gv2 ground connection, the change of current to be measured becomes source side winding head end Ge1 and is connected with net side voltage-dividing capacitor head end, and the change of current to be measured becomes net side Winding tail end Ge2 ground connection.Meanwhile, converter transformer valve side winding head end Gv1 and source side winding head end Ge1 to be measured respectively with office The monitoring passage putting instrument connects.After to be accessed, become G to the change of current to be measured and input test voltage, detect the change of current to be measured and become G's Value is put in office.

It should be noted that in this article, such as the relational terms of " first " and " second " or the like be used merely to by One entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or behaviour Relation or the order of any this reality is there is between work.And, term " includes ", " comprising " or it is any Other variants are intended to comprising of nonexcludability so that include the process of a series of key element, method, article or Equipment not only includes those key elements, but also includes other key elements being not expressly set out, or also includes for this mistake The key element that journey, method, article or equipment are intrinsic.In the case of there is no more restriction, statement " include one It is individual ... " key element that limits, it is not excluded that there is also in including the process of described key element, method, article or equipment Other identical element.

The above is only detailed description of the invention of the present utility model, makes to skilled artisans appreciate that or realize this reality With novel.Multiple amendment to these embodiments will be apparent to one skilled in the art, herein institute The General Principle of definition can realize in the case of without departing from spirit or scope of the present utility model in other embodiments. Therefore, this utility model is not intended to be limited to the embodiments shown herein, and is to fit to disclosed herein Principle and the consistent the widest scope of features of novelty.

Claims (5)

1. a change of current changed situation puts assay device, it is characterized in that, including variable-frequency power sources (P) and exciting transformer (T), the input of described variable-frequency power sources (P) is used for connecting three-phase alternating current, the outfan of described variable-frequency power sources (P) electrically connects with the input of exciting transformer (T), the alternating current that described variable-frequency power sources (P) output frequency is controlled, and transported to described exciting transformer (T);
Described variable-frequency power sources (P) is double variable-frequency power sources, it is specially, described variable-frequency power sources (P) includes the first variable-frequency power sources (P1) and the second variable-frequency power sources (P2), described first variable-frequency power sources (P1) and described second variable-frequency power sources (P2) control line in parallel connect, and export Phase synchronization by the first variable-frequency power sources (P1) described in described Parallel Control line traffic control with described second variable-frequency power sources (P2), alternating current that frequency is consistent;
The outfan of described exciting transformer (T) connects a parallel circuit (R), and the AC conversion that described variable-frequency power sources (P) exports is High Level AC Voltage by described exciting transformer (T);
Described parallel circuit (R) includes dividing potential drop branch road and the compensation branch road of parallel connection;
Change of current changed situation is put assay device and is also included a PD meter (M), and value is put in the office being used for detecting the change of current to be measured change (G).
Change of current changed situation the most according to claim 1 puts assay device, it is characterized in that, described exciting transformer (T) includes that the first exciting transformer (T1) and the second exciting transformer (T2), described first exciting transformer (T1) are connected with described second exciting transformer (T2) reversed polarity;Described parallel circuit (R) includes the first parallel circuit (R1) and the second parallel circuit (R2);
The input of described first variable-frequency power sources (P1) is used for connecting three-phase alternating current, the outfan of described first variable-frequency power sources (P1) electrically connects with the low-pressure side of described first exciting transformer (T1), the high-pressure side polar end of described first exciting transformer (T1) is used for connecting converter transformer valve side winding head end (Gv1) to be measured, the high-pressure side non-polar end ground connection of described first exciting transformer (T1);The head end of described first parallel circuit (R1) is used for connecting described converter transformer valve side winding head end (Gv1) to be measured, the tail end ground connection of described first parallel circuit (R1);
The input of described second variable-frequency power sources (P2) is used for connecting three-phase alternating current, the outfan of described second variable-frequency power sources (P2) electrically connects with the low-pressure side of described second exciting transformer (T2), the high-pressure side non-polar end of described second exciting transformer (T2) is used for connecting converter transformer valve side winding tail end (Gv2) to be measured, the high-pressure side polar end ground connection of described second exciting transformer (T2);The head end of described second parallel circuit (R2) is used for connecting described converter transformer valve side winding tail end (Gv2) to be measured, the tail end ground connection of described second parallel circuit (R2);
Described change of current changed situation is put assay device and is also included that a net side voltage-dividing capacitor, the head end of described net side voltage-dividing capacitor are used for connecting the described change of current to be measured and become source side winding head end (Ge1), the tail end ground connection of the head end of net side voltage-dividing capacitor;
Described PD meter (M) is used for detecting the office of the described change of current to be measured change (G) and puts value.
Change of current changed situation the most according to claim 1 puts assay device, it is characterized in that, described exciting transformer (T) includes that the first exciting transformer (T1), described parallel circuit (R) include the first parallel circuit (R1);
The outfan of described first variable-frequency power sources (P1) and described second variable-frequency power sources (P2) is simultaneously connected with the low-pressure side of described first exciting transformer (T1), the high-pressure side polar end of described first exciting transformer (T1) is connected with the head end of described first parallel circuit (R1), the high-pressure side non-polar end of described first exciting transformer (T1) is connected with the tail end of described first parallel circuit (R1), the head end of described first parallel circuit (R1) is used for connecting described converter transformer valve side winding head end (Gv1) to be measured, the tail end ground connection of described first parallel circuit (R1);
Described change of current changed situation is put assay device and is also included that a net side voltage-dividing capacitor, the head end of described net side voltage-dividing capacitor are used for connecting the described change of current to be measured and become source side winding head end (Ge1), the tail end ground connection of described net side voltage-dividing capacitor;
Described PD meter (M) is used for detecting the office of the change of current to be measured change (G) and puts value.
Change of current changed situation the most according to claim 1 puts assay device, it is characterised in that be provided with detection impedance (Zm) in described PD meter (M), and value is put in the office being detected the described change of current to be measured change by described detection impedance (Zm).
Change of current changed situation the most according to claim 1 puts assay device, it is characterised in that be provided with voltmeter in described dividing potential drop branch road, and shown voltmeter is for the magnitude of voltage of experiment with measuring circuit.
CN201620310654.9U 2016-04-13 2016-04-13 Change of current becomes partial discharge test device CN205608139U (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106556787A (en) * 2016-11-21 2017-04-05 云南电网有限责任公司电力科学研究院 Power supply capacity compensation method in experiment is put in a kind of single-phase office of transformator
CN106556786A (en) * 2016-11-21 2017-04-05 云南电网有限责任公司电力科学研究院 A kind of corner connection change of current becomes the method that symmetrical applied voltage test office puts
CN106597234A (en) * 2016-12-09 2017-04-26 广西电友科技发展有限公司 Parallel elementary-error compensation power-frequency voltage-withstand test method
CN106771911A (en) * 2016-12-09 2017-05-31 广西电友科技发展有限公司 A kind of elementary errors compensation industrial frequency withstand voltage experimental rig in parallel
CN108037430A (en) * 2017-11-16 2018-05-15 云南电网有限责任公司电力科学研究院 A kind of 10kV distribution transformers three-phase partial discharge test system
CN110208661A (en) * 2019-06-21 2019-09-06 中国电建集团河南工程有限公司 Offshore boosting station transformer pressure resistance local discharge test method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106556787A (en) * 2016-11-21 2017-04-05 云南电网有限责任公司电力科学研究院 Power supply capacity compensation method in experiment is put in a kind of single-phase office of transformator
CN106556786A (en) * 2016-11-21 2017-04-05 云南电网有限责任公司电力科学研究院 A kind of corner connection change of current becomes the method that symmetrical applied voltage test office puts
CN106597234A (en) * 2016-12-09 2017-04-26 广西电友科技发展有限公司 Parallel elementary-error compensation power-frequency voltage-withstand test method
CN106771911A (en) * 2016-12-09 2017-05-31 广西电友科技发展有限公司 A kind of elementary errors compensation industrial frequency withstand voltage experimental rig in parallel
CN108037430A (en) * 2017-11-16 2018-05-15 云南电网有限责任公司电力科学研究院 A kind of 10kV distribution transformers three-phase partial discharge test system
CN110208661A (en) * 2019-06-21 2019-09-06 中国电建集团河南工程有限公司 Offshore boosting station transformer pressure resistance local discharge test method

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