Electric reactor temperature rise testing device

Abstract

The reactor temperature rise testing device comprises a control host, a DC resistance tester, a high-voltage AC power supply, a tested reactor, a load, a contactor KM1, a contactor KM2 and a contactor KM3, the high-voltage AC power supply drives the load to work through the tested reactor, and the reactor temperature rise testing device is characterized in that a normally open point of the contactor KM1 is connected in series between the tested reactor and the high-voltage AC power supply; one end of the direct current resistance tester is connected between the normally open contact of the contactor KM1 and the reactor to be tested through the normally open contact of the contactor KM2, and the other end of the direct current resistance tester is connected to the two ends of the reactor to be tested through the normally open contact of the contactor KM3 and the normally open contact of the contactor KM2. According to the reactor temperature rise testing device of the utility model, the on-load test of the reactor to be tested under the rated working condition is realized, so that the temperature rise test data of the reactor to be tested can reflect the actual working state better, and the evaluation of the actual temperature rise performance of the reactor is facilitated.

Description

Technical Field

[0001] This utility model relates to a testing device, and more specifically, to a reactor temperature rise testing device. Background Technology

[0002] In industrial electrical equipment, reactors are common electrical components, mainly used to solve common problems such as current limiting, filtering, smoothing, and power factor compensation. However, the insulation requirements and temperature rise limits for reactors are quite stringent. Therefore, users need to pay attention to the performance of reactors during long-term operation and conduct relevant temperature rise baseline tests to comprehensively evaluate their performance. This paper proposes a reactor temperature rise testing device to test the temperature rise performance of reactors. Summary of the Invention

[0003] In order to overcome the shortcomings of the above-mentioned technical problems, this utility model provides a reactor temperature rise testing device.

[0004] This utility model discloses a reactor temperature rise testing device, comprising a control host, a DC resistance tester, a high-voltage AC power supply, a reactor under test, a load, contactors KM1, KM2, and KM3. The high-voltage AC power supply drives the load through the reactor under test. The control host and the DC resistance tester are connected via a communication line. The device is characterized in that: a normally open contact of contactor KM1 is connected in series between the reactor under test and the high-voltage AC power supply; one end of the DC resistance tester is connected between the normally open contact of contactor KM1 and the reactor under test via the normally open contact of contactor KM2; the other end of the DC resistance tester is connected between the reactor under test and the load via the normally open contact of contactor KM3; the control host is used to control the switching of contactors KM1 with contactors KM2 and KM3.

[0005] The reactor temperature rise testing device of this utility model includes a PLC controller, intermediate relays K1 and K2, and an interlocking circuit in the control host. The coils of intermediate relays K1 and K2 are connected between the positive terminal of the DC power supply and different output terminals of the PLC controller. The coil of contactor KM1, the normally closed terminal of intermediate relay K2, and the normally open terminal of intermediate relay K1 are connected in series to the two ends of the DC power supply. The coils of contactor KM2 and KM3, the normally closed terminal of intermediate relay K1, and the normally open terminal of intermediate relay K2 are connected in series to the two ends of the DC power supply.

[0006] The reactor temperature rise testing device of this utility model has a control host connected to a human-machine interface via a communication line, and the control host is equipped with a power supply line connected to the mains power.

[0007] The reactor temperature rise testing device of this utility model has three sets of test cables on the DC resistance tester for connecting to the two ends of the reactor under test.

[0008] The reactor temperature rise testing device of this utility model has a test button S1 and an emergency stop button S2 on the control host, and the test button S1 and the emergency stop button S2 are connected to different input ports of the PLC controller.

[0009] The beneficial effects of this utility model are as follows: The reactor temperature rise testing device of this utility model is equipped with a control host, a DC resistance tester, a human-machine interface, and contactors KM1, KM2, and KM3. A high-voltage AC power supply (i.e., the test power supply) supplies power to the load through the normally open contact of contactor KM1 and the reactor under test. The test cable of the DC resistance tester is connected to both ends of the reactor under test through the normally open contacts of KM2 and KM3. Thus, under the control of the control host, the normally open contact of contactor KM1 is closed, and the high-voltage AC power supply supplies power to the load through the reactor under test. Power is supplied, and then contactors KM2 and KM3 are closed after the reactor under test has been working for a period of time to measure the resistance of the reactor under test. This process is repeated to achieve load testing of the reactor under test under rated operating conditions. This makes the temperature rise test data of the reactor under test more reflective of the actual working state and more conducive to evaluating the actual temperature rise performance of the reactor. At the same time, since contactors KM1 and KM2 and KM3 are switched on and off alternately, the test power supply (i.e., high-voltage AC power supply) and the DC resistance tester are not powered on at the same time, thus protecting the DC resistance tester. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the reactor temperature rise testing device of this utility model.

[0011] Figure 2 This is a schematic diagram of the test principle of the reactor temperature rise test device of this utility model;

[0012] Figure 3 This is a wiring diagram of the PLC controller in this utility model;

[0013] Figure 4 This is a schematic diagram of the interlock circuit in this utility model.

[0014] In the diagram: 1 Control host, 2 DC resistance tester, 3 Human-machine interface, 4 PLC controller, 5 High-voltage AC power supply, 6 Test reactor, 7 Load, 8 Power supply line, 9 Test cable; K1 and K2 are intermediate relays, and KM1, KM2 and KM3 are contactors. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] like Figure 1 The diagram shows the structural principle of the reactor temperature rise testing device of this utility model. The device consists of a control host 1, a DC resistance tester 2, a human-machine interface 3, a high-voltage AC power supply 5, the reactor under test 6, a load 7, contactors KM1, KM2, and KM3. Both the DC resistance tester 2 and the human-machine interface 3 are communicatively connected to the control host 1. The DC resistance tester 2 measures the resistance of the reactor under test 6, and the measured data is sent to the control host 1. The control host 1 displays the measured resistance data through the human-machine interface 3. The control host 1 is equipped with a power cord 8 for connecting to the mains power supply. The DC resistance tester 2 has three sets of test cables 9 connected to the terminals of the reactor under test 6 to display the resistance value of the reactor under test 6.

[0017] like Figure 2 The diagram shows the test principle of the reactor temperature rise testing device of this invention. The high-voltage AC power supply 5 (i.e., the test power supply) is connected to the output terminal of the reactor under test 6 via the normally open contact of contactor KM1. The output terminal of the reactor under test 6 is connected to the load 7. Thus, the high-voltage AC power supply 5 supplies power to the load 7 via the normally open contact of contactor KM1 and the reactor under test 6. One end of the DC resistance tester 2 is connected to the input terminal of the reactor under test 6 via the normally open contact of contactor KM2, and the other end of the DC resistance tester 2 is connected to the output terminal of the reactor under test 6 via the normally open contact of contactor KM3.

[0018] In this way, the control host 1 controls the normally open contact of contactor KM1 to close, so that the high-voltage AC power supply 5 supplies power to the load 7 through the reactor under test 6, driving the load to work. At this time, the reactor under test 6 also works under rated conditions. After working for a period of time, contactor KM1 is disconnected, so that its normally open contact is opened, and the normally open contacts of contactors KM2 and KM3 are closed, so that the DC resistance tester 2 is connected to the circuit to realize the resistance measurement of the reactor under test 6. This cycle is repeated to realize the load test of the reactor under test under rated operating conditions. When the measured resistance value of the reactor no longer changes, it indicates that the temperature of the reactor under test 6 has reached the maximum value, and the measurement ends.

[0019] As can be seen, since contactor KM1 alternates with contactors KM2 and KM3, meaning that their normally open contacts do not close simultaneously, the high-voltage AC power supply 5 is prevented from being connected to the DC resistance tester 2, thus achieving effective protection for the DC resistance tester 2.

[0020] In order to realize the control host 1 to control the testing process of DC resistance tester 2, the control host 1 is equipped with PLC controller 4, intermediate relay K1, intermediate relay K2 and interlock circuit. The coils of intermediate relay K1 and intermediate relay K2 are connected to different output terminals of DC power supply and PLC controller 4 so that PLC controller 4 can control the on and off state of the coils of intermediate relay K1 and intermediate relay K2.

[0021] like Figure 4 The diagram shows the schematic of the interlocking circuit in this invention. In the interlocking circuit, the coil of contactor KM1, the normally closed contact of intermediate relay K2, and the normally open contact of intermediate relay K1 are connected in series to the two ends of a DC power supply. Similarly, the coils of contactor KM2 and KM3, the normally closed contact of intermediate relay K1, and the normally open contact of intermediate relay K2 are connected in series to the two ends of a DC power supply. Thus, contactor K1's coil is energized only when the coil of intermediate relay K1 is energized and the coil of intermediate relay K2 is de-energized. At this time, the high-voltage AC power supply 5 supplies power to the load through the reactor under test 6. When testing the reactor's resistance, the normally open contacts of contactors KM2 and KM3 close only when the coil of intermediate relay K2 is energized and the coil of intermediate relay K1 is de-energized. At this time, the DC resistance tester 2 measures the resistance value of the reactor under test 6.

[0022] Figure 1 The control host 1 shown is equipped with a test button S1 and an emergency stop button S2. Figure 3 In the diagram, the test button S1 and the emergency stop button S2 are connected to different input terminals of the PLC controller 4. After the cable is connected, pressing the test button S1 will automatically test the reactor 6 under test.

Claims

1. A reactor temperature rise testing device, comprising a control host (1), a DC resistance tester (2), a high-voltage AC power supply (5), a reactor under test (6), a load (7), contactors KM1, KM2, and KM3, wherein the high-voltage AC power supply drives the load to work via the reactor under test, and the control host is connected to the DC resistance tester via a communication line; characterized in that: A normally open contact of contactor KM1 is connected in series between the reactor under test and the high-voltage AC power supply. One end of the DC resistance tester is connected between the normally open contact of contactor KM1 and the reactor under test via the normally open contact of contactor KM2, and the other end of the DC resistance tester is connected between the reactor under test and the load via the normally open contact of contactor KM3. The control host is used to control the switching of contactors KM1, KM2, and KM3.

2. The reactor temperature rise testing device according to claim 1, characterized in that: The control host (1) is equipped with a PLC controller (4), intermediate relays K1 and K2 and an interlock circuit. The coils of intermediate relays K1 and K2 are connected between the positive terminal of the DC power supply and different output terminals of the PLC controller. The coil of contactor KM1, the normally closed terminal of intermediate relay K2 and the normally open terminal of intermediate relay K1 are connected in series to the two ends of the DC power supply. The coil of contactor KM2, the coil of contactor KM3, the normally closed terminal of intermediate relay K1 and the normally open terminal of intermediate relay K2 are connected in series to the two ends of the DC power supply.

3. The reactor temperature rise testing device according to claim 1 or 2, characterized in that: The control host (1) is connected to the human-machine interface (3) via a communication line, and the control host is equipped with a power cord (8) that is connected to the mains power.

4. The reactor temperature rise testing device according to claim 1 or 2, characterized in that: The DC resistance tester (2) is equipped with three sets of test cables (9) for connecting to both ends of the reactor (6) under test.

5. The reactor temperature rise testing device according to claim 2, characterized in that: The control host (1) is equipped with a test button S1 and an emergency stop button S2, which are connected to different input ports of the PLC controller (4).

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