CN106526330A - Portable impact current generator for measuring impact ground resistance - Google Patents

Portable impact current generator for measuring impact ground resistance Download PDF

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Publication number
CN106526330A
CN106526330A CN201611252867.1A CN201611252867A CN106526330A CN 106526330 A CN106526330 A CN 106526330A CN 201611252867 A CN201611252867 A CN 201611252867A CN 106526330 A CN106526330 A CN 106526330A
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CN
China
Prior art keywords
circuit
voltage
transistor
current
main
Prior art date
Application number
CN201611252867.1A
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Chinese (zh)
Inventor
黄欢
杜昊
曾华荣
马晓红
罗洪
毛先胤
曹辉
李江涛
何可夫
刘行
Original Assignee
贵州电网有限责任公司电力科学研究院
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Priority to CN201611252867.1A priority Critical patent/CN106526330A/en
Publication of CN106526330A publication Critical patent/CN106526330A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/28Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/20Measuring earth resistance; Measuring contact resistance, e.g. of earth connections, e.g. plates
    • G01R27/205Measuring contact resistance of connections, e.g. of earth connections

Abstract

The invention discloses a portable impact current generator for measuring the impact ground resistance. The portable impact current generator comprises a main circuit and a control circuit. The main circuit is used for generating an impact current and is connected with the control circuit. The control circuit is used for controlling the main circuit to conduct the pulse discharge. The tail end of the main circuit is respectively connected with the current injection electrode and the backflow electrode of a grounding body. The current injection electrode is connected with a pulse voltage divider. The measuring end of pulse voltage divider is connected with an oscilloscope. The portable impact current generator further comprises a rogowski coil connected in series with the backflow electrode. The rogowski coil is connected with the oscilloscope. According to the technical scheme of the invention, the current impact of the grounding body is measured, and measured impact voltage and current waveforms are accurate and reliable. Meanwhile, the portable impact current generator is small in size, light in weight, convenient to transport and assemble, low in test cost, and simple and convenient to operate. The test dangerousness is greatly reduced. Meanwhile, the charging voltage can be up to 50 kV and the amplitude value of the impact current can be up to 3kA.

Description

A kind of portable impact current feedback circuit for impulse earthed resistance measurement
Technical field
The invention belongs to Grounding Technology of Modern Power System field, more particularly to a kind of for the portable of impulse earthed resistance measurement Formula impulse current generator.
Background technology
Grounding device is to ensure that power system safety and stability runs indispensable pith.With power system capacity Continuous increase, the continuous improvement of electric pressure, the impact of the transient fault electric current to system such as operation, thunder and lightning be also increasing, Therefore the diffusing effect to grounding device under impact is put forward higher requirement.Operation of Electric Systems experience have shown that, most of Transmission line of electricity trip accident is all to cause tripping operation due to transmission line of lightning strike or shaft tower.According to electric network fault categorised statistical form It is bright, in total tripping times of high-tension line operation, 40%~70% is accounted for by the number of times that thunderbolt causes.Electric power line pole tower grounding body Impulse earthed resistance tower top when directly determining thunderbolt current potential, so as to affect overvoltage that insulator chain bears and counterattack general Rate.Therefore, in the design of overhead line structures, the impulse earthed resistance value of its grounding device has important meaning to the lightning protection of circuit Justice.But electric power line pole tower grounding device is still using specific in China and international transmission line of electricity Lightning Protection Analysis calculate The lumped parameter resistance of value is simulating.In fact, under dash current effect, the power transformation when earth resistance of grounding device is Resistance, is presented complicated nonlinear characteristic, and the lumped parameter resistance for adopting particular value at present is to cause lightning protection come analogue ground device Analysis result differs larger with the actual running results, it is impossible to accurately calculate the main cause of the lightning protection properties of actual transmission line of electricity.
At present, two big class are broadly divided into the research of impulse earthed resistance, one is theoretical simulation research, and two is that test is ground Study carefully.With the development of computer technology, simulation study has obtained very big development.The transient characterisitics of simulated ground device mainly have Following several method:Transmission line theory, Circuit theory, Theory of Electromagnetic Field, Finite Element Method etc., but these methods have certain , can there is certain deviation with the impact characteristics of actual grounding device in limitation, therefore experimental study remains research impact and connects The most direct effectively method of ground resistance.The inductive effect and spark of impulse earthed resistance can be studied well by field test Effect.But the impulse current generator of current real model experiment is bulky, complex operation, transport and assembled in situ are difficult, once Experimentation cost is very high, and high pressure scene shock-testing is dangerous higher, so developing for impulse earthed resistance measurement Portable impact current feedback circuit has important meaning.
The content of the invention
The technical problem to be solved in the present invention is:A kind of portable impact electric current for impulse earthed resistance measurement is provided Generator, measurement are accurate, and small volume is lightweight, transport and easy to assembly, and experimentation cost is low, simple to operation, substantially reduces Test is dangerous, to solve the technical problem of impulse earthed resistance field test presence.
The technical scheme that the present invention takes is:A kind of portable impact electric current for impulse earthed resistance measurement occurs Device, including main circuit, control circuit;Main circuit is used to produce dash current, and is connected with control circuit, and control circuit is used to control Main circuit processed carries out pulsed discharge;Main circuit tail end is connected respectively to the electric current injector of grounding body and backflow pole, and injector connects Pulse analyser is connected to, the measurement end of pulse analyser is connected to oscillograph, also including the Luo-coil for being serially connected in backflow pole, sieve Family name's coil is connected to oscillograph, and oscillograph is used for the waveform of the pulse voltage and electric current for measuring grounding body.
Preferably, above-mentioned main circuit includes AC alternating current power supplys, pressure regulator T1, rectification silicon stack D1, charging resistor R1, voltage stabilizing electricity Hold C1, high-frequency inversion bridge, booster transformer T2, rectification silicon stack D2, charging resistor R2, divider, main capacitance C2, discharge switch S, wave regulating resistor R3With harmonic inductance L, AC ac power outputs are connected to pressure regulator T1, pressure regulator T1Output one end concatenation is whole Stream silicon stack D1With charging resistor R1, electric capacity of voltage regulation C1One end is connected to charging resistor R1, the other end is connected to pressure regulator T1The other end, Electric capacity of voltage regulation C1Outfan is parallel with high-frequency inversion bridge, and high-frequency inversion bridging is connected to booster transformer T2, booster transformer T2Output Rectification silicon stack D is serially connected with one end2With charging resistor R2, divider and main capacitance C2After parallel connection, two ends are connected respectively to and fill Resistance R2With booster transformer T2The output other end, main capacitance C2Positive pole is serially connected with discharge switch S, wave regulating resistor R3And harmonic Inductance L, the electric current injector of harmonic inductance connection to grounding body, the current reflux pole of grounding body are connected to booster transformer T2Separately One end, discharge switch S are sphere gap switch, and by magnet control ball gap action, electric magnet is connected to control circuit, main capacitance C2Two End is connected with the sample circuit of collection voltages, and sample circuit includes divider and ADC change-over circuits, and sample circuit is connected to Control circuit.
Preferably, above-mentioned high-frequency inversion bridge is by transistor Q1, transistor Q2, transistor Q3, transistor Q4Bridge joint is formed, brilliant Body pipe Q1, transistor Q2, transistor Q3With transistor Q4Insulated gate bipolar transistor is adopted.
Preferably, above-mentioned divider is by the high-voltage arm resistance R that resistance is 50M Ω4It is low-voltage arm resistance R with resistance5String Connect and form.
Preferably, above-mentioned main capacitance C2Impulse capacitor for two pressure 30kV, 1uF is connected, main capacitance C2Negative pole connects Ground.
Preferably, above-mentioned control circuit connection electric magnet, sample circuit, drive circuit and display circuit, electric magnet are used for Control discharge switch, sample circuit is connected to controller by ADC change-over circuits, for main capacitance C2Both end voltage adopt Collection, drive circuit is for being driven to the four of high-frequency inversion bridge transistors.
Preferably, above-mentioned a kind of portable impact current feedback circuit for impulse earthed resistance measurement, also including leading back Road case and control chamber, control chamber are connected in major loop case, major loop case by wire and optical fiber and install main circuit, in control chamber Control circuit and pressure regulator T are installed1, control chamber surface is provided with for showing main capacitance C2The display screen of charging voltage, pressure regulator T1Voltage-regulation knob, control discharge switch and the trigger button of high-frequency inversion bridge, emergency stop push button and power supply instruction Lamp.
Beneficial effects of the present invention:Compared with prior art, the present invention is connected to ground connection by the main circuit of dash current Body, and rush of current is carried out by control circuit, oscillograph is connected to grounding body electric current using Luo-coil and pulse analyser Impact is measured, and measured surge voltage and current waveform will definitely really be leaned on, and equipment volume is little, lightweight, is transported and is assembled Convenient, experimentation cost is low, simple to operation, substantially reduces test danger, and charging voltage highest can reach 50kV, Dash current amplitude highest can reach 3kA, to the test of live impulse earthed resistance with important engineering significance.
Description of the drawings
Fig. 1 is portable impact current feedback circuit main circuit and test loop schematic diagram;
Fig. 2 is control chamber front panel schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment is described further to the present invention.
Embodiment 1:A kind of portable impact current feedback circuit for impulse earthed resistance measurement, including main circuit, control Circuit processed;Main circuit is used to produce dash current, and is connected with control circuit, and control circuit enters horizontal pulse for controlling main circuit Electric discharge, main circuit tail end are connected respectively to the electric current injector of grounding body and backflow pole, and injector is connected to pulse analyser, arteries and veins Rush potentiometer measurement end and be connected to oscillograph, also including the Luo-coil for being serially connected in backflow pole, Luo-coil is connected to oscillograph, Oscillograph is used for the waveform of the pulse voltage and electric current for measuring grounding body.
Preferably, above-mentioned main circuit includes AC alternating current power supplys, pressure regulator T1, rectification silicon stack D1, charging resistor R1, voltage stabilizing electricity Hold C1, high-frequency inversion bridge, booster transformer T2, rectification silicon stack D2, charging resistor R2, divider, main capacitance C2, discharge switch S, wave regulating resistor R3With harmonic inductance L, AC ac power outputs are connected to pressure regulator T1, pressure regulator T1Output one end concatenation is whole Stream silicon stack D1With charging resistor R1, electric capacity of voltage regulation C1One end is connected to charging resistor R1, the other end is connected to pressure regulator T1The other end, Electric capacity of voltage regulation C1Outfan is parallel with high-frequency inversion bridge, and high-frequency inversion bridging is connected to booster transformer T2, booster transformer T2Output Rectification silicon stack D is serially connected with one end2With charging resistor R2, divider and main capacitance C2After parallel connection, two ends are connected respectively to and fill Resistance R2With booster transformer T2The output other end, main capacitance C2Positive pole is serially connected with discharge switch S, wave regulating resistor R3And harmonic Inductance L, the electric current injector of harmonic inductance connection to grounding body, the current reflux pole of grounding body are connected to booster transformer T2Separately One end, discharge switch S are sphere gap switch, and by magnet control ball gap action, electric magnet is connected to control circuit, main capacitance C2Two End is connected with the sample circuit of collection voltages, and sample circuit includes divider and ADC change-over circuits, and sample circuit is connected to Control circuit.
Preferably, above-mentioned high-frequency inversion bridge is by transistor Q1, transistor Q2, transistor Q3, transistor Q4Bridge joint is formed, brilliant Body pipe Q1, transistor Q2, transistor Q3With transistor Q4Insulated gate bipolar transistor is adopted.
Preferably, above-mentioned divider is by the high-voltage arm resistance R that resistance is 50M Ω4It is low-voltage arm resistance R with resistance5String Connect and form.
Preferably, above-mentioned main capacitance C2Impulse capacitor for two pressure 30kV, 1uF is connected, main capacitance C2Negative pole connects Ground.
Preferably, above-mentioned control circuit connection electric magnet, sample circuit, drive circuit and display circuit, electric magnet are used for Control discharge switch, sample circuit is connected to control circuit, for main capacitance C2Both end voltage collection, drive circuit is used for Four transistors of high-frequency inversion bridge are driven.
Preferably, above-mentioned a kind of portable impact current feedback circuit for impulse earthed resistance measurement, also including leading back Road case and control chamber, control chamber are connected in major loop case, major loop case by wire and optical fiber and install main circuit, in control chamber Control circuit and pressure regulator T are installed1, control chamber surface is provided with for showing main capacitance C2The display screen of charging voltage, pressure regulator T1Voltage-regulation knob, control discharge switch and the trigger button of high-frequency inversion bridge, emergency stop push button and power supply instruction Lamp.
In order to reduce the volume and weight of itself, this impulse current generator is not self-powered, needs outside offer 220V Alternating current, need to provide accumulator and inverter during on-the-spot test.
Silicon stack D1、D2All for by AC rectification be unidirectional current.
Charging resistor R1Resistance be 40 Ω, for limiting the charging current of electric capacity of voltage regulation, but do not make charging rate mistake Slowly.
Electric capacity of voltage regulation C1For providing a galvanic current pressure, capacitance is 1000uF, pressure 500V.
Charging resistor R2Resistance be 1M Ω, the maximum charging current for limiting main capacitance is 50mA, but does not make to fill Electric speed is excessively slow.
Insulated gate bipolar transistor Q1、Q2、Q3、Q4High-frequency inversion bridge is constituted, reverse frequency is 50kHz, Q1And Q3Drive Dynamic signal is identical, Q2And Q4Drive signal it is identical, and 180 ° of the two drive signal phases, in order to prevent bridge arm direct pass, The Dead Time of 1us, Q are set1、Q2、Q3、Q4From pressure 500V, the transistor of through-flow more than 10A, it is ensured that its safety and stability work Make.
Booster transformer T2For high frequency transformer, no-load voltage ratio 1:140, rated voltage 50kV, rated capacity 3kVA, than identical appearance The Industrial Frequency Transformer volume of amount is much smaller.
Divider is used to measure main capacitance C2Both end voltage, and be displayed on control chamber front panel in real time, high-voltage arm Resistance R4Resistance is 50M Ω, and low-voltage arm resistance is 5k Ω, and intrinsic standoff ratio is 10000.
Discharge switch S is sphere gap switch, by its action of magnet control, when control chamber presses triggering button, electromagnetism Tie Tong Electricity, ball stand-off distance puncture from rapid shortening, ball gap, and main capacitance docking conductive discharge produces dash current.
Main capacitance C2For two pressure 30kV, the impulse capacitor series connection of 1uF, voltage is from 0 to the charging for charging to 50kV Time is less than 2.5s.
Adjustable wave regulating resistor R3, resistance is 10 Ω, for adjusting impulse current waveform, can make waveform for standard 2.6us/50us lightning current waveform.
Adjustable harmonic inductance L, inductance value is 60uH, for adjusting impulse current waveform, can make waveform for standard 2.6us/50us lightning current waveform.
For guarantee test personal security, main capacitance C2Should be grounded nearby.
(2) implementation of control chamber is as follows
There is pressure regulator T in control chamber1And control circuit, control chamber passes through wire and optical fiber is connected with major loop case.Control Case panel is designed as shown in Fig. 2 power supply indicator is disposed with front panel, charging voltage display screen, trigger button, voltage-regulation Knob, emergency stop push button.
Power supply indicator is used to show whether the present invention is already connected to power supply, if display lamp is bright, illustrates that power supply is normal.
Charging voltage display screen shows C on main capacitance2Charging voltage, sample in divider, through digital-to-analogue conversion After be displayed on charactron.
Trigger button connects magnet control button and insulated gate bipolar transistor Q1、Q2、Q3、Q4Drive circuit, when When trigger button is pressed, electromagnet action makes ball gap Distance Shortened, while latch actuation circuit, makes Q1、Q2、Q3、Q4All close It is disconnected, stop main capacitance C2Charging.Voltage-regulation knob is connected with pressure regulator, changes pressure regulator output voltage by adjusting.Tightly Anxious stop button is used for emergency power off, and electric capacity of voltage regulation and main capacitance are discharged, and stops test.
(3) in-site measurement implementation:
Backflow pole and Voltage Reference pole position are determined according to the size and actual place size of grounding body, by figure Connection cloth circuits shown in 1, all connecting lines all adopt sufficiently long insulation strut as on the ground, and testing current adopts Roche line Circle, voltage tester adopts pulse analyser, Luo-coil and pulse analyser to be connected to oscillograph, after all wiring checks are errorless Just portable impact current feedback circuit battery main switch can be opened.Charging voltage can be just adjusted afterwards, trigger discharge measuring ripple Shape.Change different charging voltage amplitudes, the voltage and current waveform under different dash currents can be measured, by analysis meter Calculate, it is possible to obtain the impulse earthed resistance characteristic of tested grounding body.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained Cover within protection scope of the present invention, therefore, protection scope of the present invention should be defined by the scope of the claims.

Claims (7)

1. it is a kind of for impulse earthed resistance measurement portable impact current feedback circuit, it is characterised in that:Including main circuit, control Circuit processed;Main circuit is used to produce dash current, and is connected with control circuit, and control circuit enters horizontal pulse for controlling main circuit Electric discharge, main circuit tail end are connected respectively to the electric current injector of grounding body and backflow pole, and injector is connected to pulse analyser, arteries and veins Rush potentiometer measurement end and be connected to oscillograph, also including the Luo-coil for being serially connected in backflow pole, Luo-coil is connected to oscillograph, Oscillograph is used for the surge voltage and current waveform for measuring grounding body.
2. a kind of portable impact current feedback circuit for impulse earthed resistance measurement according to claim 1, which is special Levy and be:Main circuit includes AC alternating current power supplys, pressure regulator T1, rectification silicon stack D1, charging resistor R1, electric capacity of voltage regulation C1, high-frequency inversion Bridge, booster transformer T2, rectification silicon stack D2, charging resistor R2, divider, main capacitance C2, discharge switch S, wave regulating resistor R3 With harmonic inductance L, AC ac power outputs are connected to pressure regulator T1, pressure regulator T1Output one end concatenation rectification silicon stack D1With fill Resistance R1, electric capacity of voltage regulation C1One end is connected to charging resistor R1, the other end is connected to pressure regulator T1The other end, electric capacity of voltage regulation C1It is defeated Go out end and be parallel with high-frequency inversion bridge, high-frequency inversion bridging is connected to booster transformer T2, booster transformer T2Output is serially connected with one end Rectification silicon stack D2With charging resistor R2, divider and main capacitance C2After parallel connection, two ends are connected respectively to charging resistor R2And liter Pressure transformer T2The output other end, main capacitance C2Positive pole is serially connected with discharge switch S, wave regulating resistor R3With harmonic inductance L, harmonic electricity Sense is connected to the electric current injector of grounding body, and the current reflux pole of grounding body is connected to booster transformer T2The other end, electric discharge are opened Pass S is sphere gap switch, and by magnet control ball gap action, electric magnet is connected to control circuit, main capacitance C2Two ends are connected with adopts The sample circuit of collecting voltage, sample circuit include divider and ADC change-over circuits, and sample circuit is connected to control circuit.
3. a kind of portable impact current feedback circuit for impulse earthed resistance measurement according to claim 2, which is special Levy and be:High-frequency inversion bridge is by transistor Q1, transistor Q2, transistor Q3, transistor Q4Bridge joint is formed, transistor Q1, transistor Q2, transistor Q3With transistor Q4Insulated gate bipolar transistor is adopted.
4. a kind of portable impact current feedback circuit for impulse earthed resistance measurement according to claim 2, which is special Levy and be:Divider is by the high-voltage arm resistance R that resistance is 50M Ω4With low-voltage arm resistance R that resistance is 5k Ω5Concatenation and Into.
5. a kind of portable impact current feedback circuit for impulse earthed resistance measurement according to claim 2, which is special Levy and be:Main capacitance C2Impulse capacitor for two pressure 30kV, 1uF is connected, main capacitance C2Minus earth.
6. a kind of portable impact current feedback circuit for impulse earthed resistance measurement according to claim 1, which is special Levy and be:Control circuit connection electric magnet, sample circuit, drive circuit and display circuit, electric magnet are used to control discharge switch, Sample circuit is connected to control circuit, for main capacitance C2Both end voltage collection, drive circuit is for high-frequency inversion bridge Four transistors be driven.
7. a kind of portable impact current feedback circuit for impulse earthed resistance measurement according to claim 1, which is special Levy and be:Also include major loop case and control chamber, control chamber is connected to peace in major loop case, major loop case by wire and optical fiber Dress main circuit, installs control circuit and pressure regulator T in control chamber1, control chamber surface is provided with for showing main capacitance C2Charge electricity The display screen of pressure, pressure regulator T1Voltage-regulation knob, control discharge switch and high-frequency inversion bridge trigger button, emergent stopping Button and power supply indicator.
CN201611252867.1A 2016-12-30 2016-12-30 Portable impact current generator for measuring impact ground resistance CN106526330A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107037256A (en) * 2017-03-31 2017-08-11 中广核核电运营有限公司 Ground detection device
CN107219423A (en) * 2017-06-06 2017-09-29 中国电力科学研究院 Lightning impulse response measurement system
CN107478929A (en) * 2017-08-03 2017-12-15 国网四川省电力公司电力科学研究院 A kind of multifunctional mobile earthing or grounding means test system
CN108802461A (en) * 2017-04-28 2018-11-13 南京理工大学 A kind of high-voltage bleeder device tested for direct current and transient process
CN109581157A (en) * 2018-11-15 2019-04-05 青岛艾诺智能仪器有限公司 A kind of quick bump test device of turn-to-turn and method
CN110635708A (en) * 2019-11-06 2019-12-31 上海联影医疗科技有限公司 High-voltage direct-current power supply, high-voltage pulse modulator and radiotherapy equipment

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107037256A (en) * 2017-03-31 2017-08-11 中广核核电运营有限公司 Ground detection device
CN108802461A (en) * 2017-04-28 2018-11-13 南京理工大学 A kind of high-voltage bleeder device tested for direct current and transient process
CN108802461B (en) * 2017-04-28 2020-12-18 南京理工大学 High-voltage divider device for testing direct current and transient process
CN107219423A (en) * 2017-06-06 2017-09-29 中国电力科学研究院 Lightning impulse response measurement system
CN107478929A (en) * 2017-08-03 2017-12-15 国网四川省电力公司电力科学研究院 A kind of multifunctional mobile earthing or grounding means test system
CN109581157A (en) * 2018-11-15 2019-04-05 青岛艾诺智能仪器有限公司 A kind of quick bump test device of turn-to-turn and method
CN109581157B (en) * 2018-11-15 2020-12-18 青岛艾诺智能仪器有限公司 Inter-turn rapid continuous impact testing device and method
CN110635708A (en) * 2019-11-06 2019-12-31 上海联影医疗科技有限公司 High-voltage direct-current power supply, high-voltage pulse modulator and radiotherapy equipment

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