CN207516449U - High tension switchgear temperature rise test device and system - Google Patents
High tension switchgear temperature rise test device and system Download PDFInfo
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- CN207516449U CN207516449U CN201721275031.3U CN201721275031U CN207516449U CN 207516449 U CN207516449 U CN 207516449U CN 201721275031 U CN201721275031 U CN 201721275031U CN 207516449 U CN207516449 U CN 207516449U
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Abstract
The utility model provides a high tension switchgear temperature rise test device and system, the device includes: the system comprises a main loop and a measurement and control loop electrically connected with the main loop; the main loop is used for receiving first alternating current output by the alternating current power supply, converting the first alternating current into corresponding direct current, carrying out inversion processing on the direct current to obtain second alternating current, and transmitting the second alternating current to the high-voltage switch cabinet; and the measurement and control loop is used for acquiring the second alternating current output by the main loop, and outputting a corresponding pulse signal to the main loop according to the set output current value and the current value of the second alternating current so as to control the main loop to adjust the current value of the second alternating current until the current value of the second alternating current meets the set output current value. The utility model provides a high tension switchgear temperature rise test device and system can provide the steady current that the current value meets the requirements for high tension switchgear, including stable heavy current, and the deviation of the electric current of exporting to high tension switchgear is little.
Description
Technical field
The utility model is related to electric system high current temperature rise test technical field more particularly to a kind of high-tension switch cabinet temperature
Rise experimental rig and system.
Background technology
According to the requirement of country and professional standard, high-tension switch cabinet needs to carry out long-time temperature rise test, i.e., height is pressed off
It closes cabinet and applies specified three-phase current or 1.1 times of specified three-phase currents, until high-tension switch cabinet internal temperature reaches stable state.
This experiment is that the important tests project of workmanship inspection is carried out to high-tension switch cabinet, can examine the heat dissipation of high-tension switch cabinet
Performance.At present, as net capacity is increasing, electricity demand increases, and the rated current of high-tension switch cabinet also increases therewith,
Even there is the high-tension switch cabinet that rated current is 4000A in Shenzhen area, if carrying out high current temperature rise test, need specified
Electric current is the temperature-rise test device of 4400A.At present, high-tension switch cabinet temperature-rise test device is substantially using pressure regulator as basic knot
Conventional AC power is changed into the exchange that voltage is low, electric current is big by pressure regulator and exported by structure, and pass through pressure regulator realize it is defeated
Go out the adjusting of voltage and current.Current existing high-tension switch cabinet temperature-rise test device there are it is following the problem of：Device includes big
Capacity pressure regulator, contactor etc., volume is big, and test site occupation of land is more, and mainly passes through pressure regulator tap and realize mechanical adjustment
Electric current, governing speed is slow, precision of steady current is low, and acquisition cost is high.
Meanwhile requirement of the high current temperature rise test of high-tension switch cabinet to temperature-rise test device is very high, it would be desirable to be able to export
Stable high current, the deviation of output current is no more than 3% during experiment.High current temperature rise test duration simultaneously
It is longer, generally 5 hours or so, thus need to ensure that electric current is satisfied by requiring during experiment, thus temperature rise test is filled
The requirement put is very high.
Utility model content
In order to solve the above technical problems, the utility model provides a kind of high-tension switch cabinet temperature-rise test device and system, it can
To provide current value satisfactory stabling current for high-tension switch cabinet, including stable high current, and export to high-voltage switch gear
The deviation of the electric current of cabinet is small.
A kind of high-tension switch cabinet temperature-rise test device provided by the utility model, including：Major loop and major loop electricity
Property connection observing and controlling circuit；
First AC conversion for receiving the first alternating current of AC power output, and is by the major loop
Corresponding direct current, then the direct current is subjected to inversion processing, the second alternating current is obtained, and second alternating current is conveyed
To high-tension switch cabinet；
The observing and controlling circuit, for acquiring second alternating current of the major loop output, and according to the output of setting
The current value of current value and second alternating current exports corresponding pulse signal to the major loop, to control the master
The current value of second alternating current described in loop modulation, until the current value of second alternating current meets the output electricity of the setting
Flow valuve.
Preferably, the major loop includes：What step-down isolation transformer and the step-down isolation transformer were electrically connected
PWM rectifier, the PWM inverter being electrically connected with the PWM rectifier；
The step-down isolation transformer, for receiving first alternating current of the AC power output, and by described in
First alternating current is depressured to obtain corresponding third alternating current, and the third alternating current is delivered to the PWM rectifier；
The PWM rectifier for the third alternating current to be carried out rectification, obtains the direct current, then will be described straight
Galvanic electricity is delivered to the PWM inverter；
The PWM inverter for the direct current to be carried out inversion processing, obtains second alternating current, and by institute
It states the second alternating current and is delivered to the high-tension switch cabinet.
Preferably, the major loop further includes the filtered electrical being connected between the PWM rectifier and the PWM inverter
Sense.
Preferably, the observing and controlling circuit includes：The first driving unit being connect with the PWM inverter, it is whole with the PWM
Flow the second driving unit of device connection, the central processing list being connect with first driving unit and second driving unit
Member, the AC current sensor being connect with the PWM inverter exchange side, with the central processing unit and the alternating current
The signal processing unit of sensor connection, the direct current being connect with the PWM inverter DC side and the signal processing unit
Flow sensor；
The AC current sensor, for acquiring second alternating current of the PWM inverter output, and will acquisition
Second alternating current be delivered to the signal processing unit；
The DC current sensor, for acquiring the direct current of PWM rectifier output, and by the institute of acquisition
It states direct current and is delivered to the signal processing unit；
The signal processing unit, second AC conversion for that will acquire are believed for corresponding alternating current number
Number, and be corresponding direct current digital signal, and by the alternating current digital signal and institute by the DC conversion of acquisition
It states direct current digital signal and is delivered to the central processing unit；
The central processing unit, for according to the alternating current digital signal, calculating the described of the major loop output
The current value of second alternating current calculates the current value of the direct current also according to the direct current digital signal, and according to described
The current value control corresponding with the generation of the output current value of the setting of the current value of second alternating current, the direct current refers to
It enables, and the control instruction is delivered to first driving unit and second driving unit；
First driving unit, for according to the control instruction, generating corresponding first pulse signal, and by described in
First pulse signal is delivered to the PWM inverter, the PWM inverter to be controlled to adjust the electric current of second alternating current
Value；
Second driving unit, for according to the control instruction, generating corresponding second pulse signal, and by described in
Second pulse signal is delivered to the PWM rectifier, the PWM rectifier to be controlled to adjust the current value of the direct current.
Preferably, the observing and controlling circuit further includes the interactive unit with central processing unit communication connection；
The setup parameter for receiving the setup parameter of input, and is delivered to the centre by the interactive unit
Unit is managed, wherein, the setup parameter includes the output current value of the setting；
The central processing unit is additionally operable to the current value of second alternating current being delivered to the interactive unit progress
It has been shown that, and judge whether the output current value of the setting is more than the maximum output current of the major loop, if so, sending out report
It is alert.
Preferably, the PWM rectifier is three-phase current source type PWM rectifier；
The PWM rectifier includes the first bridge arm parallel with one another, the second bridge arm, third bridge arm and the first alternating current
Appearance, the second ac capacitor, third ac capacitor, first bridge arm, second bridge arm, the midpoint of the third bridge arm and institute
State step-down isolation transformer connection, and the of first ac capacitor, second ac capacitor, the third ac capacitor
Midpoint of the one end respectively with first bridge arm, second bridge arm, the third bridge arm is connect, and the other end is connected with each other；
Wherein, first bridge arm, second bridge arm, the third bridge arm include two IGBT being connected in series with
Pipe.
Preferably, the PWM inverter is three-phase current source type PWM inverter；
The PWM inverter includes four bridge legs parallel with one another, the 5th bridge arm, the 6th bridge arm and the 4th alternating current
Appearance, the 5th ac capacitor, the 6th ac capacitor, the four bridge legs, the 5th bridge arm, the midpoint of the 6th bridge arm and institute
State high-tension switch cabinet connection, and the first end of the 4th ac capacitor, the 5th ac capacitor, the 6th ac capacitor
The midpoint with the four bridge legs, the 5th bridge arm, the 6th bridge arm is connect respectively, and the other end is connected with each other；
Wherein, the both ends of the third bridge arm and the both ends of the four bridge legs are correspondingly connected with, the four bridge legs, described
5th bridge arm, the 6th bridge arm include two IGBT being connected in series with pipes, and IGBT pipes include a switching transistor
With the diode with the switching transistor reverse parallel connection.
The utility model also provides a kind of high-tension switch cabinet temperature rise test system, parallel with one another above-mentioned including at least two
High-tension switch cabinet temperature-rise test device and with the high-tension switch cabinet temperature-rise test device be electrically connected AC power.
Implement the utility model, have the advantages that：The utility model can be according to output current set by user
Value is carried out dynamic regulation and is exported to the electric current of high-tension switch cabinet, including stable high current and low current, makes output to high-voltage switch gear
The electric current of cabinet meets the requirement of temperature rise test, and the current deviation exported is small, and because can basis during temperature rise test
The output current value of setting carrys out dynamic regulation and exports to the electric current of high-tension switch cabinet, it is possible to during ensureing temperature rise test
It exports to the electric current of high-tension switch cabinet and stablizes, even if the alternating current of AC power output changes, also can guarantee and be supplied to height
The current value of cabinet of compressing switch is met the requirements.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the circuit diagram of high-tension switch cabinet temperature-rise test device provided by the utility model.
Fig. 2 is the circuit diagram of PWM rectifier in an embodiment provided by the utility model.
Fig. 3 is the circuit diagram of PWM inverter in an embodiment provided by the utility model.
Fig. 4 is the circuit diagram of embodiment middle-high voltage switch temperature rise test system provided by the utility model.
Specific embodiment
The utility model provides a kind of high-tension switch cabinet temperature-rise test device, as shown in Figure 1, the high-tension switch cabinet temperature rises examination
Experiment device includes：Major loop 1, the observing and controlling circuit 2 being electrically connected with major loop 1.High-tension switch cabinet temperature provided by the utility model
It rises experimental rig and can be used for 3 high current temperature rise test of high-tension switch cabinet, can be used for 3 low current temperature of high-tension switch cabinet and rise examination
It tests, high current here refers generally to the electric current that current value is more than or equal to 3000A, and low current refers generally to the electric current less than 3000A.
First AC conversion is to correspond to for continuously receiving the first alternating current that AC power 4 exports by major loop 1
Direct current, then direct current is subjected to inversion processing, obtains the second alternating current, and pressed off the second alternating current continuous conveying is supreme
Close cabinet 3.
Observing and controlling circuit 2 is used to acquire the second alternating current of the output of major loop 1, and according to the output current value of setting and
The current value of second alternating current exports corresponding pulse signal to major loop 1, is handed over so that major loop 1 is controlled to adjust the second of output
The current value of galvanic electricity, until the current value of the second alternating current meets the output current value of setting.
Further, major loop 1 includes：Step-down isolation transformer 11, the PWM being electrically connected with step-down isolation transformer 11
Rectifier 12, the PWM inverter 14 being electrically connected with PWM rectifier 12.
Step-down isolation transformer 11 is for continuously receiving the first alternating current that AC power 4 exports, and by the first alternating current
It is depressured to obtain corresponding third alternating current, and third alternating current is delivered to PWM rectifier 12.
PWM rectifier 12 is used to third alternating current carrying out rectification, obtains direct current, then that direct current is delivered to PWM is inverse
Become device 14.
PWM inverter 14 is used to direct current carrying out inversion processing, obtains the second alternating current, and the second exchange is electrically continuous
It is delivered to high-tension switch cabinet 3.
Further, major loop 1 further includes the filter inductance 13 being connected between PWM rectifier 12 and PWM inverter 14.
Further, observing and controlling circuit 2 includes：The first driving unit 25 being connect with PWM inverter 14, with PWM rectifier
Second driving unit 21 of 12 connections, the central processing unit 22 being connect with the first driving unit 25 and the second driving unit 21,
The AC current sensor 26 being connect with 14 exchange side of PWM inverter, with central processing unit 22 and AC current sensor 26
The signal processing unit 23 of connection, the DC current sensor being connect with 14 DC side of PWM inverter and signal processing unit 23
24。
AC current sensor 26 is used to acquire the second alternating current of the output of PWM inverter 14, and the second of acquisition is handed over
Galvanic electricity is delivered to signal processing unit 23.
DC current sensor 24 is used to acquire the direct current of the output of PWM rectifier 12, and the direct current of acquisition is conveyed
To signal processing unit 23.
It is corresponding alternating current digital signal, and will adopt that signal processing unit 23, which is used for the second AC conversion acquired,
The DC conversion of collection is corresponding direct current digital signal, and alternating current digital signal and direct current digital signal are delivered to
Central processing unit 22.
Central processing unit 22 is used for according to the alternating current digital signal, calculates the second alternating current that major loop 1 exports
Current value, calculate the current value of the direct current also according to direct current digital signal, and according to the current value of the second alternating current,
The current value of direct current and the corresponding control instruction of output current value generation set, and control instruction is delivered to the first driving
25 and second driving unit 21 of unit.
First driving unit 25 is used for according to control instruction, generates corresponding first pulse signal, and the first pulse is believed
Number be delivered to PWM inverter 14, with control PWM inverter 14 adjust output the second alternating current current value；
Second driving unit 21 is used for according to control instruction, generates corresponding second pulse signal, and the second pulse is believed
Number be delivered to PWM rectifier 12, with control PWM rectifier 12 adjust output direct current current value.
Further, observing and controlling circuit 2 further includes the interactive unit 27 with the communication connection of central processing unit 22, interactive unit
27 can be operation and display panel.Setup parameter is delivered to by interactive unit 27 for receiving the setup parameter of input
Central Processing Unit 22, wherein, setup parameter includes the output current value of setting.
Central processing unit 22, which is additionally operable to the current value of the second alternating current being delivered to interactive unit 27, to be shown, and sentence
Whether the output current value of disconnected setting is more than the maximum output current of major loop, if so, sending out alarm, and stops output control
It instructs to the first driving unit 25 and the second driving unit 21.
Further, PWM rectifier 12 is three-phase current source type PWM rectifier, exports the AC power 4 of the first alternating current
For three-phase alternating current source, the first alternating current is three-phase alternating current.PWM rectifier 12 includes the first bridge arm parallel with one another, the
Two bridge arms, third bridge arm and the first ac capacitor, the second ac capacitor, third ac capacitor, the first bridge arm, the second bridge arm,
The midpoint of third bridge arm is connect with step-down isolation transformer 11, and the first ac capacitor, the second ac capacitor, third ac capacitor
Midpoint of the first end respectively with the first bridge arm, the second bridge arm, third bridge arm connect, the other end is connected with each other.
Further, PWM inverter 14 is three-phase current source type PWM inverter.PWM inverter 14 includes parallel with one another
Four bridge legs, the 5th bridge arm, the 6th bridge arm and the 4th ac capacitor, the 5th ac capacitor, the 6th ac capacitor, the 4th bridge
Arm, the 5th bridge arm, the 6th bridge arm midpoint connect with high-tension switch cabinet 3, and the 4th ac capacitor, the 5th ac capacitor, the 6th
Midpoint of the first end of ac capacitor respectively with four bridge legs, the 5th bridge arm, the 6th bridge arm is connect, and the other end is connected with each other.
Wherein, the both ends of third bridge arm and the both ends of four bridge legs are correspondingly connected with, the first bridge arm, the second bridge arm, third bridge
Arm, four bridge legs, the 5th bridge arm, the 6th bridge arm include two IGBT being connected in series with pipes (Insulated Gate
Bipolar Transistor, insulated gate bipolar transistor), and IGBT pipes include a switching transistor and and switching transistor
The diode of reverse parallel connection.
The utility model also provides a kind of high-tension switch cabinet temperature rise test system, including at least two high pressures parallel with one another
Switchgear temperature-rise test device and the AC power 4 being electrically connected with high-tension switch cabinet temperature-rise test device.For example, there are n
High-tension switch cabinet temperature-rise test device is connected in parallel, and outputs current to high-tension switch cabinet 3 jointly, needed for high-tension switch cabinet 3
Electric current is I, then the electric current of each high-tension switch cabinet temperature-rise test device output is I/n, wherein n >=2.
The utility model also provides a kind of high-tension switch cabinet temperature-raising experimental method, the high-tension switch cabinet temperature-raising experimental method packet
Include following step：
Major loop 1 receives the first alternating current that AC power 4 exports, and is corresponding direct current by the first AC conversion
Electricity, then direct current is subjected to inversion processing, the second alternating current is obtained, and the second alternating current is delivered to high-tension switch cabinet 3；
Observing and controlling circuit 2 acquires the second alternating current that major loop 1 exports, and according to the output current value of setting and second
The current value of alternating current exports corresponding pulse signal to major loop 1, and control major loop 1 adjusts the current value of the second alternating current,
Until the current value of the second alternating current meets the output current value of setting.
Further, which further includes following step：
Observing and controlling circuit 2 judges whether the output current value of setting is more than major loop 1 most according to the output current value of setting
Big output current, if so, sending out alarm.
In another embodiment of high-tension switch cabinet temperature-rise test device provided by the utility model, high-tension switch cabinet temperature rises examination
Experiment device includes major loop 1 and observing and controlling circuit 2.
Major loop 1 includes step-down isolation transformer 11, PWM rectifier 12, the filtering being connect with 12 DC side of PWM rectifier
Inductance 13 and PWM inverter 14, PWM rectifier 12 are three-phase current source type PWM rectifier, and PWM inverter 14 is three-phase electricity
Stream source type PWM inverter.Wherein, step-down isolation transformer 11 include the input terminal that is connected with 380V three-phase alternating-current supplies and with
The connected output terminal of PWM rectifier 12；PWM rectifier 12 include be connected with step-down isolation transformer 11 first end a1, with directly
Flow 13 device of filter inductance the second end a2 being connected and the third end a3 being connected with observing and controlling circuit 2；Filter inductance 13 includes whole with PWM
The connected first end of stream device 12 and the second end being connected with PWM inverter 14；PWM inverter 14 includes being connected with filter inductance 13
First end and the second end that is connected with test product high-tension switch cabinet 3.
Observing and controlling circuit 2 includes the first driving unit 25, the second driving unit 21, central processing unit 22, signal processing list
Member 23, DC current sensor 24, AC current sensor 26 and operation and display panel；Wherein, second driving unit 21
One end is connected with the first end b1 of central processing unit 22, the other end of the second driving unit 21 and the third of PWM rectifier 12
End a3 is connected；The second end b2 of central processing unit 22 is connected with operation and display panel, third end b3 and signal processing unit
23 one end c1 is connected, and the 4th end b4 of central processing unit 22 is connected with the first driving unit 25；Signal processing circuit it is another
The one end of one end c2, c3 respectively with DC current sensor 24 and AC current sensor 26 is connected；DC current sensor 24
The other end be connected with the first end (i.e. input terminal) of PWM inverter 14；The other end of AC current sensor 26 and PWM inversions
The second end (i.e. output terminal) of device 14 is connected.
In order to enable high-tension switch cabinet temperature-rise test device has, output current wave quality is high, can be carried without fuse
For reliable short-circuit protection, governing speed faster, the advantages that precision of steady current is high, it is therefore desirable to PWM rectifier 12 is designed,
As shown in Fig. 2, the PWM rectifier 12 includes the first ac capacitor C1, the second ac capacitor C2, third ac capacitor C3, first
IGBT pipes VT1, the 2nd IGBT pipes VT2, the 3rd IGBT pipes VT3, the 4th IGBT pipes VT4, the 5th IGBT pipes VT5 and the 6th IGBT pipes
VT6。
First IGBT pipes VT1, the 2nd IGBT pipes VT2, the 3rd IGBT pipes VT3, the 4th IGBT pipes VT4, the 5th IGBT pipes VT5
And the 6th IGBT pipes VT6 be reversely in parallel to be formed with a diode by a switching transistor.
First IGBT pipes VT1 and the 4th IGBT pipes VT4 are connected into the first IGBT circuits；Wherein, the first ac capacitor C1
One end is held with the A phases of external three-phase alternating current potential source to be connected, and is connected to the first IGBT pipes VT1 and the 4th IGBT together and manages
Between VT4.
3rd IGBT pipes VT3 and the 6th IGBT pipes VT6 are connected into the 2nd IGBT circuits；Wherein, the second ac capacitor C2
One end is held with the B phases of external three-phase alternating current potential source to be connected, and be connected to the 3rd IGBT pipes VT3 and the 6th IGBT pipes VT6 together
Between.
5th IGBT pipes VT5 and the 2nd IGBT pipes VT2 are connected into the 3rd IGBT circuits；Wherein, third ac capacitor C3
One end is held with the C phases of external three-phase alternating current potential source to be connected, and is connected to the 5th IGBT pipes VT5 and the 2nd IGBT together and manages
Between VT2.
Diode cathode in first IGBT pipes VT1, the diode cathode in the 3rd IGBT pipes VT3, the 5th IGBT pipes VT5
In diode cathode be connected in P points, the diode cathode in the 4th IGBT pipes VT4, the diode in the 6th IGBT pipes VT6 are just
Diode cathode in pole, the 2nd IGBT pipes VT2 is connected in N points.
First ac capacitor C1, the second ac capacitor C2, third ac capacitor C3 the other end be connected in O points.
In order to enable high-tension switch cabinet temperature-rise test device has, output current wave quality is high, can be carried without fuse
For reliable short-circuit protection, governing speed faster, the advantages that precision of steady current is high, it is therefore desirable to PWM inverter 14 is designed,
Due to using the structure of three-phase current source type PWM converter (including PWM rectifier 12 and PWM inverter 14) " back-to-back ", because
And the structure of PWM inverter 14 is consistent with the structure of PWM rectifier 12.
As shown in figure 3, PWM inverter 14 includes the 4th ac capacitor C4, the 5th ac capacitor C5, the 6th ac capacitor
C6, the 7th IGBT pipes VT7, the 8th IGBT pipes VT8, the 9th IGBT pipes VT9, the tenth IGBT pipes VT10, the 11st IGBT pipes VT11
And the 12nd IGBT pipes VT12.
7th IGBT pipes VT7, the 8th IGBT pipes VT8, the 9th IGBT pipes VT9, the tenth IGBT pipes VT10, the 11st IGBT pipes
VT11 and the 12nd IGBT pipes VT12 are reversely in parallel to be formed with a diode by a switching transistor.
7th IGBT pipes VT7 and the tenth IGBT pipes VT10 is connected into the first IGBT circuits of PWM inverter 14；Wherein,
Output is mutually held, and be connected to the 7th IGBT pipes VT7 and the tenth together as the A ' of three-phase alternating current in one end of four ac capacitor C4
Between IGBT pipes VT10.
9th IGBT pipes VT9 and the 12nd IGBT pipes VT12 is connected into the 2nd IGBT circuits of PWM inverter 14；Wherein,
Output is mutually held in one end of 5th ac capacitor C5 as the B ' of three-phase alternating current, and is connected to the 9th IGBT pipes VT9 and together
Between 12 IGBT pipes VT12.
11st IGBT pipes VT11 and the 8th IGBT pipes VT8 is connected into the 3rd IGBT circuits of PWM inverter 14；Wherein,
Output is mutually held in one end of 6th ac capacitor C6 as the C ' of three-phase alternating current, and be connected to together the 11st IGBT pipes VT11 with
Between 8th IGBT pipes VT8.
Diode cathode in 7th IGBT pipes VT7, the diode cathode in the 9th IGBT pipes VT9, the 11st IGBT pipes
Diode cathode in VT11 is connected in P points, in the diode cathode, the 12nd IGBT pipes VT12 in the tenth IGBT pipes VT10
Diode cathode in diode cathode, the 8th IGBT pipes VT8 is connected in N points.
4th ac capacitor C4, the 5th ac capacitor C5, the 6th ac capacitor C6 the other end be connected in O ' points.
In order to effectively realize the isolation of electrical primary side and secondary side, mains by harmonics and interference can be prevented to be transmitted to PWM
Rectifier 12, and then ensure to obtain more stable average anode current, therefore transformer uses step-down isolation transformer 11.
In order to which the precision of the output current of three-phase current source type PWM converter is effectively ensured, reduce ripple, therefore in high pressure
Filter inductance 13 is provided in switchgear temperature-rise test device.
If necessary to three-phase alternating current (such as electric current is I) output occasion of bigger, the utility model may be used and carry
The high-tension switch cabinet temperature rise test system of confession.As shown in figure 4, high-tension switch cabinet temperature rise test system provided by the utility model
, can be used in parallel by n high-tension switch cabinet temperature-rise test device in one embodiment, observing and controlling circuit 2 is not shown in figure, often
A high-tension switch cabinet temperature-rise test device output current is I/n (n >=2), to obtain the output alternating current of bigger.
The operation principle of high-tension switch cabinet temperature-rise test device provided by the utility model is：
1st, first, user is by operation and display panel setting experiment output current, and by the output current value of the setting
It is sent into central processing unit 22.
2nd, secondly, central processing unit 22 will be analyzed and be judged to the input of user instruction, if defeated more than maximum
Go out electric current, alarm signal is then sent more than maximum output current, otherwise enter in next step.
3rd, AC current sensor 26 acquire ac output current, and through signal processing unit 23 handle be converted into it is corresponding
It after digital signal, is sent into central processing unit 22, the AC current values that central processing unit 22 will be extracted in the digital signal
It is compared with the ac output current value of user setting, and exported according to difference therebetween and PWM rectifier 12
The current value of direct current generates corresponding control signal；Then, which is admitted to the first driving circuit and the second driving
In unit 21, IGBT each in PWM inverter 14 and PWM rectifier 12 is managed by the first driving unit 25 and the second driving unit 21
It carries out cut-offfing control so that the alternating current of the output setting of PWM inverter 14.
If the 4, needing to change the current value that PWM inverter 14 exports during experiment, user can be by operating and showing
Panel can reset test current, work after resetting the output current of experimental rig by above-mentioned 3 principle.
5th, central processing unit 22 records experiment process current conditions in real time, ensure high-tension switch cabinet 3 in temperature rise test mistake
Journey current value is met the requirements.Curent change situation during user can be tested by operation and display panel inquiry simultaneously, with
The precision of validation test electric current is met the requirements.
6th, the common closed loop feedback control using electric current as command value of the industry can be used in above-mentioned 3 control method mentioned
Method.It is illustrated for 3, its output current is directly proportional to its duty ratio according to the basic principle of PWM rectifier 12
Relationship, and the frequency of cut-offfing of IGBT pipes at least can reach 10kHz at present, i.e., the open and close times in 1 second can reach 10000 times,
Can be opened by control, the times and duration that turn off controls energy transmission, so as to achieving the purpose that control electric current.Simultaneously
Since the DC side of PWM rectifier 12 has filter inductance 13, exchange outlet side has filter capacitor C1, C2 and C3, thus according to electricity
Hold the energy storage principle with inductance, the pulsating current that IGBT pipes export can be converted to stable electric current, so as to ensure output electricity
Stream precision is met the requirements.
AC current sensor 26 acquires ac output current, and is handled through signal processing unit 23 and be converted into corresponding number
Word signal is sent into central processing unit 22, AC current values and user that central processing unit 22 will be extracted in the digital signal
The ac output current value of setting is compared, and according to difference feedback control strategy：If output current is more defeated than user setting
It is small to go out current value, illustrates to need to increase duty ratio, that is, needs to increase number and the time that IGBT pipes are opened, central processing unit 22
Corresponding pwm control signal is generated according to difference therebetween；Then, PWM (Pulse Width Modulation, the arteries and veins
Rush width modulated) signal is controlled to be admitted in the first driving unit 25 and the second driving unit 21, by 25 He of the first driving unit
Second driving unit 21 carries out cut-offfing control to each IGBT pipes in PWM inverter 14 and PWM rectifier 12 respectively so that IGBT is managed
The accounting bigger opened, so that output current rapidly increases to user's setting value.
If output current is bigger than the output current value of user setting, illustrates to need to reduce duty ratio, that is, need to increase IGBT
The number of pipe shutdown and time, central processing unit 22 generate corresponding pwm control signal according to difference therebetween；So
Afterwards, which is admitted in the first driving unit 25 and the second driving unit 21, by the first driving unit 25 and second
Driving unit 21 carries out cut-offfing control to each IGBT pipes in PWM inverter 14 and PWM rectifier 12 respectively so that IGBT pipes turn off
Accounting bigger so that output current is rapidly decreased to user's setting value.
Experimental rig can be repeated the above process constantly, form a closed-loop feedback control system, until actual output current
It is consistent with user setting electric current.It when user setting electric current changes, also can constantly repeat the above process, ensure output current
Dynamic tracking user setting electric current.
Implement the utility model, have the advantages that：
1st, in the utility model, it is the three-phase current source type PWM converter of core (including rectifier to use using IGBT pipes
And inverter) main topology is used as, and use back to back structure, it can require and set according to user, export three-phase alternating current high current,
Temperature rise test can be carried out to high-tension switch cabinet 3.
2nd, there is presently no the topological structure of current source type PWM converter is used for high-tension switch cabinet temperature-rise test device
Application scenario.The utility model uses current source type PWM converter, is compared to voltage-source type PWM converter, although at present not
It is common, but with topological structure is simple, input/output current waveform quality is high, output current power is big, precision is high, adjusting is fast
Degree is fast, the advantages that can providing reliable short-circuit protection without fuse, and meet four quadrant running.
3rd, in the utility model, as a result of step-down isolation transformer 11, electrical primary side and two are effectively realized
The isolation of secondary side can prevent mains by harmonics and interference to be transmitted to current source type PWM converter, and then ensure to obtain and more stablize
Output current, the current precision of guarantee test process meets the requirements.
In conclusion high-tension switch cabinet temperature-rise test device provided by the utility model, can export AC power 4
Required electric current when AC conversion carries out temperature rise test for high-tension switch cabinet 3, is supplied to high-tension switch cabinet 3, and can be with
The electric current for ensureing output to high-tension switch cabinet 3 during experiment is stablized, even if the alternating current that AC power 4 exports becomes
Change, also can guarantee and the current value of high-tension switch cabinet 3 is supplied to be satisfied by requiring during temperature rise test.
High-tension switch cabinet temperature-rise test device provided by the utility model does not include large capacity pressure regulator, contactor, can be with
Reduce the floor space of high-tension switch cabinet temperature-rise test device, adopted by DC current sensor 24 and AC current sensor 26
Colleeting comb signal, and central processing unit 22 is fed back to, PWM rectifier 12 and PWM inverter are controlled by central processing unit 22
14 output, the speed of adjusting is fast, and precision of steady current is high, and acquisition cost is low.It, will with the rise of the Power Electronic Technique such as IGBT pipes
Power electric component should be used in the power system and be possibly realized, and have power with the electric power electric component that IGBT Guan Wei are represented
Factor is high, loss is small, high conversion efficiency, cut-offs the advantages of frequency is high, control effect is good, small to the harmonic pollution of power grid.Wherein,
Current source type converter is a kind of important solution, compared with voltage converter, has simple in structure, output current
The characteristics of waveform quality is high is very suitable for applying in temperature rise test occasion.At present, on the market high current temperature-rise test device is several
That using power electric component, as mechanism, current source type converter is not applied to high-tension switch cabinet 3 by the utility model
Temperature is risen in the structure of device, has larger advantage.
The above content is combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that the specific implementation of the utility model is confined to these explanations.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, several simple deduction or replace can also be made, should all be regarded
To belong to the scope of protection of the utility model.
Claims (8)
1. a kind of high-tension switch cabinet temperature-rise test device, which is characterized in that including：Major loop is electrically connected with the major loop
Observing and controlling circuit；
The major loop, for receiving the first alternating current of AC power output, and by first AC conversion to correspond to
Direct current, then the direct current is subjected to inversion processing, obtains the second alternating current, and will second alternating current conveying it is supreme
Compress switch cabinet；
The observing and controlling circuit, for acquiring second alternating current of the major loop output, and according to the output current of setting
The current value of value and second alternating current, exports corresponding pulse signal to the major loop, to control the major loop
The current value of second alternating current is adjusted, until the current value of second alternating current meets the output current of the setting
Value.
2. high-tension switch cabinet temperature-rise test device according to claim 1, which is characterized in that the major loop includes：Drop
It presses isolating transformer, the PWM rectifier being electrically connected with the step-down isolation transformer, be electrically connected with the PWM rectifier
PWM inverter；
The step-down isolation transformer, for receiving first alternating current of AC power output, and by described first
Alternating current is depressured to obtain corresponding third alternating current, and the third alternating current is delivered to the PWM rectifier；
The PWM rectifier for the third alternating current to be carried out rectification, obtains the direct current, then by the direct current
It is delivered to the PWM inverter；
The PWM inverter for the direct current to be carried out inversion processing, obtains second alternating current, and by described the
Two alternating currents are delivered to the high-tension switch cabinet.
3. high-tension switch cabinet temperature-rise test device according to claim 2, which is characterized in that the major loop further includes string
The filter inductance being associated between the PWM rectifier and the PWM inverter.
4. high-tension switch cabinet temperature-rise test device according to claim 3, which is characterized in that the observing and controlling circuit includes：
The first driving unit being connect with the PWM inverter, the second driving unit being connect with the PWM rectifier, with described
The central processing unit that one driving unit is connected with second driving unit, the friendship being connect with the PWM inverter exchange side
Galvanic electricity flow sensor, the signal processing unit being connect with the central processing unit and the AC current sensor are and described
PWM inverter DC side and the DC current sensor of signal processing unit connection；
The AC current sensor, for acquiring second alternating current of PWM inverter output, and by the institute of acquisition
It states the second alternating current and is delivered to the signal processing unit；
The DC current sensor, for acquiring the direct current of PWM rectifier output, and by the described straight of acquisition
Galvanic electricity is delivered to the signal processing unit；
The signal processing unit, second AC conversion for that will acquire are corresponding alternating current digital signal, and
It is corresponding direct current digital signal by the DC conversion of acquisition, and by the alternating current digital signal and the direct current
Electric digital signal is delivered to the central processing unit；
The central processing unit, for according to the alternating current digital signal, calculating described the second of the major loop output
The current value of alternating current calculates the current value of the direct current also according to the direct current digital signal, and according to described second
Current value and the corresponding control instruction of the output current value of setting generation of the current value of alternating current, the direct current, and
The control instruction is delivered to first driving unit and second driving unit；
First driving unit, for according to the control instruction, generating corresponding first pulse signal, and by described first
Pulse signal is delivered to the PWM inverter, the PWM inverter to be controlled to adjust the current value of second alternating current；
Second driving unit, for according to the control instruction, generating corresponding second pulse signal, and by described second
Pulse signal is delivered to the PWM rectifier, the PWM rectifier to be controlled to adjust the current value of the direct current.
5. high-tension switch cabinet temperature-rise test device according to claim 4, which is characterized in that the observing and controlling circuit further includes
With the interactive unit of central processing unit communication connection；
The setup parameter for receiving the setup parameter of input, and is delivered to the central processing list by the interactive unit
Member, wherein, the setup parameter includes the output current value of the setting；
The central processing unit, is additionally operable to the current value of second alternating current being delivered to the interactive unit and shows
Show, and judge whether the output current value of the setting is more than the maximum output current of the major loop, if so, sending out report
It is alert.
6. high-tension switch cabinet temperature-rise test device according to claim 2, which is characterized in that the PWM rectifier is three
Phase current source type PWM rectifier；
The PWM rectifier includes the first bridge arm parallel with one another, the second bridge arm, third bridge arm and the first ac capacitor, the
Two ac capacitors, third ac capacitor, first bridge arm, second bridge arm, the midpoint of the third bridge arm and the drop
Press isolating transformer connection, and the first end of first ac capacitor, second ac capacitor, the third ac capacitor
The midpoint with first bridge arm, second bridge arm, the third bridge arm is connect respectively, and the other end is connected with each other；
Wherein, first bridge arm, second bridge arm, the third bridge arm include two IGBT being connected in series with pipes.
7. high-tension switch cabinet temperature-rise test device according to claim 6, which is characterized in that the PWM inverter is three
Phase current source type PWM inverter；
The PWM inverter includes four bridge legs parallel with one another, the 5th bridge arm, the 6th bridge arm and the 4th ac capacitor, the
Five ac capacitors, the 6th ac capacitor, the four bridge legs, the 5th bridge arm, the midpoint of the 6th bridge arm and the height
The cabinet that compresses switch connects, and the first end difference of the 4th ac capacitor, the 5th ac capacitor, the 6th ac capacitor
It is connect with the midpoint of the four bridge legs, the 5th bridge arm, the 6th bridge arm, the other end is connected with each other；
Wherein, the both ends of the third bridge arm and the both ends of the four bridge legs are correspondingly connected with, the four bridge legs, the described 5th
Bridge arm, the 6th bridge arm include two be connected in series with IGBT pipe, and the IGBT pipe include a switching transistor and with
The diode of the switching transistor reverse parallel connection.
8. a kind of high-tension switch cabinet temperature rise test system, including described at least two any one of claim 1 ~ 7 parallel with one another
High-tension switch cabinet temperature-rise test device and with the high-tension switch cabinet temperature-rise test device be electrically connected AC power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721275031.3U CN207516449U (en) | 2017-09-30 | 2017-09-30 | High tension switchgear temperature rise test device and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721275031.3U CN207516449U (en) | 2017-09-30 | 2017-09-30 | High tension switchgear temperature rise test device and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727962A (en) * | 2017-09-30 | 2018-02-23 | 深圳供电局有限公司 | High-voltage switch cabinet temperature rise test device, system and method |
| CN112379260A (en) * | 2020-12-07 | 2021-02-19 | 江苏省电力试验研究院有限公司 | Rapid temperature rise test method and platform for switch equipment |
-
2017
- 2017-09-30 CN CN201721275031.3U patent/CN207516449U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727962A (en) * | 2017-09-30 | 2018-02-23 | 深圳供电局有限公司 | High-voltage switch cabinet temperature rise test device, system and method |
| CN107727962B (en) * | 2017-09-30 | 2024-06-07 | 深圳供电局有限公司 | High-voltage switch cabinet temperature rise test device, system and method |
| CN112379260A (en) * | 2020-12-07 | 2021-02-19 | 江苏省电力试验研究院有限公司 | Rapid temperature rise test method and platform for switch equipment |
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