CN106054055B - Parallel resonance formula capacitor exchanges life test rack - Google Patents

Abstract

The invention belongs to test equipment in the electric power industry, in particular to a parallel resonant capacitor AC life test bench, which includes a power supply circuit (1), which also includes a switch circuit (2) and an execution circuit (3); the switch circuit (2) includes Adjustable inductance 2 DG ₂ , relay GQ ₁ ~GQ ₄ , green indicator light LD ₂ , LD ₃ , red indicator light HD ₂ , HD ₃ , normally open switch K ₇ ~K ₁₆ , normally closed switch BK ₃ ~BK ₁₀ ; The executive circuit (3) includes the power factor meter GB, the current transformer HG ₂ , and the electric oven HX; the operating frequency of the parallel resonant capacitor AC life test bench is 400Hz, which is several times higher than that of the existing test bench, and is suitable for Due to the characteristics of the parallel resonant circuit, its inductive reactance and capacitive reactance cancel each other out, which will not cause pollution to the power grid, and all the power supply energy is the energy consumed by the resistance, without providing reactive power, so that the energy consumption is greatly reduced.

Description

Parallel resonant capacitor AC life test bench

technical field

The invention belongs to test equipment in the electric power industry, in particular to a parallel resonant capacitor AC life test stand.

Background technique

At present, the power of various equipment used in the power grid is increasing, and the capacitors connected in the power grid are directly connected to the power grid. The test bench for AC life is particularly important. The traditional AC life test bench for capacitors 50Hz is far from meeting the needs of the current capacitor AC life test. If the test data of the capacitor cannot be obtained, the capacitor is directly connected to the power grid, resulting in large power consumption, and the capacitor can make the current ahead of the voltage, which will pollute the power grid and cause accidents. .

Contents of the invention

The object of the present invention is to overcome the above-mentioned technical deficiencies, and provide a parallel resonant capacitor AC life test bench that can meet the needs of high-power capacitors, has simple and convenient test operation, and accurate tests.

The technical scheme adopted by the present invention to solve _the technical problem is: a parallel resonant capacitor AC life test bench, which is characterized in that it includes a switch circuit, _a power supply circuit and an execution circuit; _4. Green indicator lights LD ₂ , LD ₃ , red indicator lights HD ₂ , HD ₃ , normally open switches K ₇ ~K ₁₆ , normally closed switches BK ₃ ~BK ₁₀ ; their connection relationship is one end of normally open switch K ₇ Connect to one end of normally open switches K ₁ and K ₃ in the power circuit, one end of normally closed switch BK ₁ , normally open switches K ₉ , K ₁₀ , K ₁₂ , K ₁₃ in the switching circuit, green indicator lights LD ₂ , LD ₃ , and red indicators One end of lights HD ₂ and HD ₃ , one end of normally open switch K ₈ are connected to normally open switches K ₂ , K ₄ in the power circuit, one end of red indicator light HD ₁ , normally open switches K ₁₁ , K ₁₄ and normally closed switches in the switching circuit BK ₆ , BK ₁₀ , relay GQ ₁ ~ GQ ₄ rear ends, the other end of the normally open switch K ₇ is connected to pin 1 of the adjustable inductance 2 DG ₂ , the other end of the normally open switch K ₈ is connected to the adjustable inductance 2 DG ₂ 2 pins, one end of the normally open switch K ₁₅ , the other end of the normally open switch K ₁₅ is connected to one end of the voltmeter Y ₁ in the power circuit, and one end of the normally open switch K ₁₆ is connected to the 3 pin of the adjustable inductance 2 DG ₂ , normally The other end of the open switch K ₁₆ is connected to the other end of the voltmeter Y ₁ in the power circuit, one end of the normally open switch K ₅ , the two ends of the current transformer HG ₁ , the 1 foot of the step-up transformer T, and the normally open switch K _9. The other end of K ₁₀ is connected to one end of normally closed switch BK ₃ , the other end of normally closed switch BK ₃ is connected to one end of normally closed switch BK ₄ , the other end of normally closed switch BK ₄ is connected to one end of normally closed switch BK ₅ , The other end of the normally closed switch BK ₅ is connected to the other end of the relay GQ ₁ and GQ ₂ , the other end of the green indicator light LD ₂ is connected to the other end of the normal switch K ₁₁ , the other end of the normally closed switch BK ₆ is connected to the other end of the red indicator light HD ₂ One end is connected, the other end of the normally open switch K ₁₂ and K ₁₃ is connected to one end of the normally closed switch BK ₇ , the other end of the normally closed switch BK ₇ is connected to one end of the normally closed switch BK ₈ , and the other end of the normally closed switch BK 8 is connected to the normally closed switch BK ₈ . One end of the closed switch BK ₉ , the other end of the normally closed switch BK ₉ is connected to the other end of the relay GQ ₃ and GQ ₄ , the other end of the green indicator light LD ₃ is connected to the other end of the normally open switch K ₁₄ , and the normally closed switch BK ₁₀ is connected to the other end of the relay GQ 3 and GQ 4. The other end of the red indicator HD ₃ is connected; the power supply circuit includes: adjustable inductor DG1, voltage divider YQ, step-up transformer T, current transformer HG1, voltmeter Y1, voltmeter Y2, power supply TY, live wire terminal DZ1, neutral wire terminal DZ2, grounding terminal DZ3, red indicator light HD1, green indicator light LD1, normally open switches K1~K6, normally closed switches BK1, BK2; their connections The relationship is: the 2 pins of the step-up transformer T are connected to one end of the normally open switch K6, the 2 and 4 pins of the power supply TY are respectively connected to the other end of the normally open switches K5 and K6, and the 1 and 3 pins of the power supply TY are respectively connected to the green indicator light LD1 The two ends of the normally open switch K3, the other end of K4, the other end of the normally closed switch BK is connected to one end of the normally closed switch BK2, the normally closed switch BK2 is connected to the other end of the red indicator HD1, the normally open switch K1, K2 The other end is respectively connected to live wire terminal DZ1 and neutral wire terminal DZ2, and the ground wire is connected to ground terminal DZ3. The execution circuit includes power factor meter GB, current transformer HG ₂ , and electric oven HX; their connection relationship is: pin 1 of the power factor meter GB is connected to pin 4 of the step-up transformer T in the power circuit, and an adjustable inductor Pin 2 of DG ₁ , one end of voltmeter 2 Y ₂ , pin 2 of power factor meter GB are connected to the other end of voltmeter 2 Y ₂ in the power circuit, one end of voltage divider YQ, 4 and 5 of power factor meter GB The feet are respectively connected to the two ends of the current transformer 2 HG ₂ , and one end of the capacitor C ₁ ~ C ₃ in the electric oven HX is connected to the 1 foot of the adjustable inductance 1 DG ₁ in the power circuit through the current transformer 2 HG ₂ , and the voltage divider The other end of the transformer YQ, the 3 pins of the step-up transformer T, and the other end of the capacitors C ₁ ~ C ₃ in the electric oven HX are connected to the 3 pins of the adjustable inductance-DG ₁ .

The beneficial effects of the present invention are: the operating frequency of the parallel resonant capacitor AC life test bench is 400 Hz, which is several times higher than that of the existing test bench, and the applicable range is wide. Due to the characteristics of the parallel resonant circuit, its inductive reactance And the capacitive reactance cancel each other out, will not cause pollution to the grid, and the power supply power is all the energy consumed by the resistance, no need to provide reactive power, so that the energy consumption is greatly reduced.

Description of drawings

The following will be described in detail with examples in conjunction with the accompanying drawings.

Fig. 1 is the circuit schematic diagram of the parallel resonant capacitor AC life test bench.

In the figure, 1-power supply circuit; 2-switch circuit; 3-execution circuit.

Detailed ways

Embodiment, referring to the accompanying drawing 1, the power supply circuit 1 includes: an adjustable inductor DG ₁ , a voltage divider YQ, a step-up transformer T, a current transformer HG ₁ , a voltmeter Y ₁ , and a voltmeter Y ₂ , power supply TY, live wire terminal DZ ₁ , neutral wire terminal DZ ₂ , ground terminal DZ ₃ , red indicator light HD ₁ , green indicator light LD ₁ , normally open switches K ₁ ~K ₆ , normally closed switches BK ₁ , BK ₂ ; Their connections are as follows: pin 2 of the step-up transformer T is connected to one end of the normally open switch _K6 , pins 2 and 4 of the power supply TY are respectively connected to the other end of the normally open switch _K5 and _K6 , pins 1 and 3 of the power supply TY Connect the two ends of the green indicator LD ₁ , the other end of the normally open switch K ₃ and K ₄ , the other end of the normally closed switch BK to one end of the normally closed switch BK ₂ , the normally closed switch BK ₂ and the red indicator HD ₁ The other end of the normally open switches K ₁ and K ₂ are respectively connected to the live wire terminal DZ ₁ and the neutral wire terminal DZ ₂ , and the ground wire is connected to the ground terminal DZ ₃ . The switch circuit 2 includes adjustable inductance 2 DG ₂ , relays GQ ₁ ~ GQ ₄ , green indicator lights LD ₂ , LD ₃ , red indicator lights HD ₂ , HD ₃ , normally open switches K ₇ ~ K ₁₆ , normally closed switches BK ₃ ~ BK ₁₀ ; their connection relationship is that one end of the normally open switch K ₇ is connected to one end of the normally open switch K ₁ and K ₃ in the power circuit 1, one end of the normally closed switch BK ₁ , and the normally open switch K ₉ and K in the switch circuit 2 ₁₀ , one end of K ₁₂ , K ₁₃ , green indicator light LD ₂ , LD ₃ , red indicator light HD ₂ , HD ₃ , one end of normally open switch K ₈ is connected to normally open switch K ₂ , K ₄ , red indicator in power circuit 1 One end of lamp HD ₁ , normally open switches K ₁₁ , K ₁₄ in switch circuit 2, normally closed switches BK ₆ , BK ₁₀ , the back end of relays GQ ₁ ~ GQ ₄ , the other end of normally open switch K ₇ is connected with adjustable inductance 2 DG Pin 1 of ₂ , the other end of the normally open switch K ₈ is connected to adjustable inductor 2 pin 2 of DG ₂ , one end of the normally open switch K ₁₅ , the other end of the normally open switch K ₁₅ is connected to the voltmeter Y 1 in the power circuit ₁ One end of the normally open switch K ₁₆ is connected to pin 3 of the adjustable inductor DG ₂ , the other end of the normally open switch K ₁₆ is connected to the other end of the voltmeter Y ₁ in the power supply circuit 1, and one end of the normally open switch K ₅ , The two ends of the current transformer one HG ₁ , the 1 foot of the step-up transformer T, the other end of the normally open switch K ₉ , K ₁₀ is connected to one end of the normally closed switch BK ₃ , and the other end of the normally closed switch BK ₃ is connected to the normally closed One end of the switch BK ₄ , the other end of the normally closed switch BK ₄ is connected to one end of the normally closed switch BK ₅ , the other end of the normally closed switch BK ₅ is connected to one end of the normally closed switch BK ₆ , and the other end of the normally closed switch BK ₆ is connected to the relay The other end of GQ ₁ and GQ ₂ , the other end of the green indicator light LD ₂ is connected to the other end of the normal switch K ₁₁ , the normally closed switch BK ₆ is connected to the other end of the red indicator light HD ₂ , the normally open switch K ₁₂ , The other end of K ₁₃ is connected to one end of normally closed switch BK ₇ , the other end of normally closed switch BK ₇ is connected to one end of normally closed switch BK ₈ , the other end of normally closed switch BK ₈ is connected to one end of normally closed switch BK ₉ , and the other end of normally closed switch BK 9 is connected. The other end of BK ₉ is connected to the other end of relays GQ ₃ and GQ ₄ , the other end of green indicator light LD ₃ is connected to the other end of normally open switch K ₁₄ , and the other end of normally closed switch BK ₁₀ is connected to the other end of red indicator light HD ₃ . The executive circuit 3 includes a power factor meter GB, a current transformer HG ₂ , and an electric oven HX; their connection relationship is: pin 1 of the power factor meter GB is connected to pin 4 of the step-up transformer T in the power supply circuit 1, and adjustable inductance Pin 2 of device 1 DG ₁ , one end of voltmeter 2 Y ₂ , pin 2 of power factor meter GB is connected to the other end of voltmeter 2 Y ₂ in power circuit 1, one end of voltage divider YQ, power factor meter GB Pins 4 and 5 are respectively connected to both ends of the current transformer 2 HG ₂ , and one end of the capacitor C ₁ ~ C ₃ in the electric oven HX is connected to pin 1 of the adjustable inductance 1 DG ₁ in the power circuit 1 through the current transformer 2 HG ₂ , the other end of the voltage divider YQ, the 3 pins of the step-up transformer T, and the other end of the capacitors C ₁ ~ C ₃ in the electric oven HX are connected to the 3 pins of the adjustable inductance-DG ₁ .

The working process of the parallel resonant capacitor AC life test bench is: connect the 220V AC power supply to the live wire terminal DZ ₁ and the neutral wire terminal DZ ₂ respectively, connect the ground wire to the ground terminal DZ ₃ , close the main circuit switch K ₁ , K ₂ , the red indicator HD ₁ is on when the equipment is not powered on, the red indicator HD ₂ of 400Hz power supply and the red indicator HD ₃ of 50Hz power supply are on. After pressing the 400Hz power supply to start the normally open switch K ₉ , the relays GQ ₁ and GQ ₂ are closed, the normally open switch K ₁₀ is closed to form self-locking, the normally closed switch BK ₁ is disconnected, the red indicator light HD ₁ is off, and the normally open switch K ₄ and K ₃ pull in to supply power to the 400Hz power supply, the green indicator light LD ₁ is on, the switches K ₅ and K ₆ are closed, and the 400Hz power supply supplies power to the main circuit. The normally open switch K ₁₁ is closed, the normally closed switch BK ₆ is disconnected, the red indicator light HD ₂ is off, the green indicator light LD ₂ is on, and the normally closed switches BK ₈ and BK ₉ are disconnected to avoid malfunction of the 50Hz control circuit. The 400Hz loop enters the working state. Electric energy enters from pins 1 and 2 of the step-up transformer T. At the same time, use a current transformer-HG ₁ to measure the primary current, a voltmeter-Y ₁ to measure the primary voltage, and connect pins 3 and 4 of the step-up transformer T to an adjustable inductor. In the parallel loop of pin 1 of DG ₁ and capacitors C ₁ , C ₂ , and C ₃ to be tested. Voltmeter 2 Y2 measures the voltage of pins 3 and 4 of the step-up transformer T, current transformer 2 HG2 measures the current of pins GB5 and 6 of the power factor meter, and the power factor meter GB uses the voltage signal measured by voltmeter 2 Y2 and the current transformer The current signal measured by the second HG ₂ is integrated into a power factor. When working, it is only necessary to adjust the inductance of the adjustable inductance-DG ₁ according to the capacity of the capacitors C ₁ , C ₂ , and C ₃ to be tested to make it resonate.

After pressing the 50Hz power supply to start the normally open switch K ₁₂ , the relays GQ ₃ and GQ ₄ are closed, the normally open switch K ₁₃ is closed to form self-locking, the normally closed switch BK ₂ is turned off, the red indicator light HD ₁ is off, and the normally open switch K ₁₄ is closed, the normally closed switch BK ₁₀ is disconnected, the red indicator HD ₃ is off, the green indicator LD ₂ is on, and the normally closed switches BK ₄ and BK ₅ are disconnected to avoid malfunction of the 400Hz control circuit. The normally open switches K ₇ , K ₈ , K ₁₅ , and K ₁₆ are closed to connect the power supply to the main circuit and enter the 50Hz power supply working state. Electric energy enters from pins 1 and 2 of the step-up transformer T, while the current transformer 1 HG ₁ measures the primary current, the voltmeter 2 Y ₂ measures the primary voltage, and the 3 and 4 pins of the step-up transformer T are connected to the adjustable inductor DG ₁ and the parallel circuit of capacitors C ₁ , C ₂ , and C3 to be measured. Voltmeter 2 Y ₂ measures the voltage of pins 3 and 4 of the step-up transformer T, current transformer 2 HG ₂ measures the current, power factor meter GB is powered by 220V AC power supply, and the voltage signal and current mutual inductance measured by voltmeter 2 Y ₂ The current signal measured by the second device HG ₂ is integrated into a power factor. When working, just adjust the inductance of the inductor-DG ₁ according to the capacity of the capacitors C ₁ , C ₂ , C ₃ . . .

Claims (1)

1. A parallel resonant capacitor AC life test bench is characterized in that it includes a power supply circuit (1), a switch circuit (2) and an execution circuit (3); the switch circuit (2) includes an adjustable inductance DG ₂ , Relays GQ ₁ ~GQ ₄ , green indicator lights LD ₂ , LD ₃ , red indicator lights HD ₂ , HD ₃ , normally open switches K ₇ ~K ₁₆ , normally closed switches BK ₃ ~BK ₁₀ ; their connections are normally open One end of the switch K ₇ is connected to one end of the normally open switches K ₁ and K ₃ in the power circuit (1), one end of the normally closed switch BK ₁ , and the normally open switches K ₉ , K ₁₀ , K ₁₂ , K ₁₃ , One end of the green indicator light LD ₂ , LD ₃ , red indicator light HD ₂ , HD ₃ , one end of the normally open switch K ₈ is connected to the normally open switch K ₂ , K ₄ in the power circuit (1), one end of the red indicator light HD ₁ , In the switch circuit (2), the normally open switch K ₁₁ , K ₁₄ , the normally closed switch BK ₆ , BK ₁₀ , the back end of the relay GQ ₁ ~ GQ ₄ , the other end of the normally open switch K ₇ is connected to pin 1 of the adjustable inductance 2 DG ₂ , the other end of the normally open switch K ₈ is connected to pin 2 of the adjustable inductor 2 DG ₂ , one end of the normally open switch K ₁₅ , and the other end of the normally open switch K ₁₅ is connected to one end of the voltmeter Y ₁ in the power circuit (1) , one end of the normally open switch K ₁₆ is connected to pin 3 of the adjustable inductance 2 DG ₂ , the other end of the normally open switch K ₁₆ is connected to the other end of the voltmeter Y ₁ in the power circuit (1), and one end of the normally open switch K ₅ , The two ends of the current transformer one HG ₁ , the 1 foot of the step-up transformer T, the other end of the normally open switch K ₉ , K ₁₀ is connected to one end of the normally closed switch BK ₃ , and the other end of the normally closed switch BK ₃ is connected to the normally closed One end of the switch BK ₄ , the other end of the normally closed switch BK ₄ is connected to one end of the normally closed switch BK ₅ , the other end of the normally closed switch BK ₅ is connected to the other end of the relay GQ ₁ and GQ ₂ , and the other end of the green indicator light LD ₂ Connect the other end of the normally closed switch K ₁₁ , the normally closed switch BK ₆ is connected to the other end of the red indicator light HD ₂ , the other end of the normally open switch K ₁₂ and K ₁₃ is connected to one end of the normally closed switch BK ₇ , the normally closed switch The other end of BK ₇ is connected to one end of normally closed switch BK ₈ , the other end of normally closed switch BK ₈ is connected to one end of normally closed switch BK ₉ , the other end of normally closed switch BK ₉ is connected to the other end of relay GQ ₃ , GQ ₄ , green The other end of the indicator light LD ₃ is connected to the other end of the normally open switch K ₁₄ , and the normally closed switch BK ₁₀ is connected to the other end of the red indicator light HD ₃ ; the power supply circuit (1) includes: adjustable inductance DG1, voltage divider Voltage transformer YQ, step-up transformer T, current transformer one HG1, voltmeter one Y1, voltmeter two Y2, power supply TY, live wire terminal DZ1, neutral wire terminal DZ2, ground terminal DZ3, red indicator light HD1, green indicator light LD1 , Normally open switch K1~ K6, normally closed switches BK1, BK2; their connection relationship is: the 2 pins of the step-up transformer T are connected to one end of the normally open switch K6, the 2 and 4 pins of the power supply TY are respectively connected to the other end of the normally open switches K5, K6, and the power supply Pins 1 and 3 of TY are respectively connected to the two ends of the green indicator LD1, the other end of the normally open switches K3 and K4, the other end of the normally closed switch BK is connected to one end of the normally closed switch BK2, the normally closed switch BK2 is connected to the red indicator HD1 The other end of the normally open switch K1 and K2 is respectively connected to the live wire terminal DZ1 and the neutral wire terminal DZ2, and the ground wire is connected to the ground terminal DZ3; the executive circuit (3) includes a power factor meter GB and a current transformer HG _2. Electric oven HX; their connection relationship is: the 1st foot of the power factor meter GB is connected to the 4th foot of the step-up transformer T in the power circuit (1), the 2nd foot of the adjustable inductor 1 DG ₁ , and the voltmeter 2 Y One end of ₂ , pin 2 of the power factor meter GB is connected to the power supply circuit (1), the other end of the voltage meter Y ₂ in the power circuit (1), one end of the voltage divider YQ, and pins 4 and 5 of the power factor meter GB are respectively connected to the current transformer 2 Both ends of HG ₂ , one end of capacitors C ₁ ~ C ₃ in the electric oven HX are connected to pin 1 of adjustable inductance 1 DG ₁ in the power circuit (1) through current transformer 2 HG ₂ , and the other end of voltage divider YQ One end, pin 3 of step-up transformer T, and the other end of capacitors C ₁ ~ C ₃ in electric oven HX are connected to pin 3 of adjustable inductance-DG ₁ .