A two-way critical current test device

Abstract

The utility model provides a kind of bidirectional critical current test device, the positive and negative switching of critical current test can be realized, effectively meet test requirement;Three-phase circuit breaker J1QF1, first ac circuit breaker QF1, second ac circuit breaker QF2 are connected in PLC control module, rectifier transformer ZTM and the A phase contact one end of ac circuit breaker QF1, QF2 are all connected, rectifier transformer ZTM and the B phase contact one end of ac circuit breaker QF1, QF2 are all connected, the C phase contact one end of first ac circuit breaker QF1, second ac circuit breaker QF2 and resistance R one end are all connected, resistance R other end and inductance L one end are connected, inductance L other end and the B phase contact other end of ac circuit breaker QF1, QF2 are all connected, the C phase contact other end of first ac circuit breaker QF1 and the C phase contact other end of second ac circuit breaker QF2 are connected and then connected in test equipment, the A phase contact other end of first ac circuit breaker QF1 and the A phase contact other end of second ac circuit breaker QF2 are connected and then connected in test equipment.

Description

Technical Field

[0001] This utility model relates to the field of DC switchgear testing technology, specifically a bidirectional critical current testing device. Background Technology

[0002] According to relevant national standards, directional DC circuit breakers and switching equipment must undergo critical current tests in both positive and negative directions. This requires constantly changing the positive and negative terminals of the testing equipment to meet the test requirements. However, existing testing equipment can only test the critical current in one direction and cannot switch between positive and negative directions. Therefore, after completing the test in one current direction, the positive and negative terminals of the test sample must be manually changed. This not only increases the workload and reduces work efficiency, but also poses safety hazards and is prone to errors. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a bidirectional critical current testing device, which can switch between forward and reverse directions for critical current testing, reducing workload, improving safety factor, and effectively meeting testing requirements.

[0004] This utility model adopts the following technical solution: a bidirectional critical current test device, including a three-phase AC power supply, a three-phase circuit breaker J1QF1, and a resistor X. R Reactor X L The components include: rectifier transformer ZTM, first AC circuit breaker QF1, second AC circuit breaker QF2, PLC control module, resistor R, and inductor L; the three-phase AC power supply is connected to the three-phase circuit breaker J1QF1 and resistor X. R Reactor X LThe rectifier transformer ZTM is connected in sequence. The three-phase circuit breakers J1QF1, QF1, and QF2 are all connected to the PLC control module. The positive output terminal of the rectifier transformer ZTM after the rectification unit is connected to one end of the A-phase contact of both the first AC circuit breaker QF1 and the second AC circuit breaker QF2. The negative output terminal of the rectifier transformer ZTM after the rectification unit is connected to one end of the B-phase contact of both the first AC circuit breaker QF1 and the second AC circuit breaker QF2. The first AC circuit breaker QF1 and the second AC circuit breaker QF2... One end of the C-phase contact of circuit breaker QF2 is connected to one end of the resistor R. The other end of the resistor R is connected to one end of the inductor L. The other end of the inductor L is connected to the other end of the B-phase contacts of the first AC circuit breaker QF1 and the second AC circuit breaker QF2. The other end of the A-phase contact of the first AC circuit breaker QF1 is connected to the other end of the C-phase contact of the second AC circuit breaker QF2 and then connected to the test equipment. The other end of the C-phase contact of the first AC circuit breaker QF1 is connected to the other end of the A-phase contact of the second AC circuit breaker QF2 and then connected to the test equipment.

[0005] Furthermore, both the first AC circuit breaker QF1 and the second AC circuit breaker QF2 are 12KV AC circuit breakers.

[0006] Furthermore, during the forward critical current test, the first AC circuit breaker QF1 is closed and the second AC circuit breaker QF2 is open; during the reverse critical current test, the first AC circuit breaker QF1 is open and the second AC circuit breaker QF2 is closed.

[0007] Furthermore, the PLC control module includes a PLC controller, intermediate relays J1-J4, switches S1-S5, and an emergency stop button S6; one end of each switch S1-S5 is connected to the input terminals X0-X4 of the PLC controller, and the other end of each switch S1-S5 is connected to the DC24V power supply of the PLC controller; one end of each coil J1-1-J4-1 of the intermediate relays J1-J4 is connected to the output terminals Y0-Y4 of the PLC controller, and the other end of each coil J1-1-J4-1 of the intermediate relays J1-J4 is connected to the AC220V power supply; the common terminal COMA of the PLC controller is connected to the AC220V power supply via a fuse FUSE.

[0008] One end of contacts J1-2 to J4-2 of the intermediate relays J1 to J4 is connected to one end of the emergency stop button S6 and then connected to an AC 220V power supply.

[0009] The other end of contact J1-2 of the intermediate relay J1 is connected to one end of the closing coil QF1-1 of the first AC circuit breaker QF1.

[0010] The other end of contact J2-2 of the intermediate relay J2 is connected to one end of the closing coil QF2-1 of the second AC circuit breaker QF2.

[0011] The other end of contact J3-2 of the intermediate relay J3 is connected to one end of the trip coil QF1-2 of the first AC circuit breaker QF1.

[0012] The other end of contact J4-2 of the intermediate relay J4 is connected to one end of the trip coil QF2-2 of the second AC circuit breaker QF2.

[0013] The other end of the emergency stop button S6 is connected to one end of the trip coil J1QF1-1 of the three-phase circuit breaker J1QF1.

[0014] The other ends of the closing coil QF1-1, closing coil QF2-1, opening coil QF1-2, opening coil QF2-2, and opening coil J1QF1-1 are connected to an AC power supply of AC220V.

[0015] Furthermore, the PLC controller includes a QF1 closing intermediate relay M0, a QF2 closing intermediate relay M1, a J1QF1 closing intermediate relay M2, a QF1 opening intermediate relay M3, and a QF2 opening intermediate relay M4.

[0016] The QF1 closing intermediate relay M0 has a QF1 closing coil M0-1, a QF1 closing normally open contact M0-2, and a QF1 closing normally closed contact M0-3;

[0017] The QF2 closing intermediate relay M1 has a QF2 closing coil M1-1, a QF2 closing normally open contact M1-2, and a QF2 closing normally closed contact M1-3;

[0018] The J1QF1 closing intermediate relay M2 has a J1QF1 closing coil M2-1 and a J1QF1 closing normally closed contact M2-2;

[0019] The QF1 tripping intermediate relay M3 has a QF1 tripping coil M3-1, a QF1 tripping normally open contact M3-2, and a QF1 tripping normally closed contact M3-3;

[0020] The QF2 tripping intermediate relay M4 has a QF2 tripping coil M4-1, a QF2 tripping normally open contact M4-2, and a QF2 tripping normally closed contact M4-3.

[0021] The beneficial effects of this utility model are that the three-phase circuit breaker J1QF1, the first AC circuit breaker QF1, and the second AC circuit breaker QF2 are all connected to the PLC control module. The first AC circuit breaker QF1 and the second AC circuit breaker QF2 allow the testing equipment to switch between forward and reverse directions. Simultaneously, it ensures that regardless of the current direction of the test, the required voltage is always applied across the testing equipment. This not only allows for unidirectional critical current determination but also enables bidirectional critical current determination, reducing workload, increasing safety, and effectively meeting testing requirements, thus possessing significant practical value. Attached Figure Description

[0022] Figure 1 This is the circuit schematic diagram of this utility model;

[0023] Figure 2 This is the circuit diagram for conducting the forward critical current test in this utility model;

[0024] Figure 3 This is the circuit diagram for conducting the reverse critical current test in this utility model;

[0025] Figure 4 This is the I / O allocation diagram of the PLC controller in this utility model;

[0026] Figure 5 This is the PLC ladder diagram of the PLC controller in this utility model;

[0027] Figure 6 This is the electrical schematic diagram of the PLC output in this utility model. Detailed Implementation

[0028] like Figures 1-6 As shown, this utility model discloses a bidirectional critical current testing device, which includes a three-phase AC power supply, a three-phase circuit breaker J1QF1, and a resistor X. R Reactor X L 1. Rectifier transformer ZTM, 2. First AC circuit breaker QF1, 3. Second AC circuit breaker QF2, PLC control module, resistor R, inductor L; 4. Three-phase AC power supply AC source and three-phase circuit breaker J1QF1, resistor X R Reactor X LThe rectifier transformer ZTM is connected in sequence. Three-phase circuit breakers J1QF1, QF1 (first AC circuit breaker), and QF2 (second AC circuit breaker) are all connected to the PLC control module. The positive output terminal of rectifier transformer ZTM after the rectification unit is connected to one end of the A-phase contact of both QF1 and QF2. The negative output terminal of rectifier transformer ZTM after the rectification unit is connected to one end of the B-phase contact of both QF1 and QF2. The first AC circuit breaker J1QF1 and the second AC circuit breaker QF2... One end of the C-phase contact of circuit breaker QF2 is connected to one end of resistor R. The other end of resistor R is connected to one end of inductor L. The other end of inductor L is connected to the other end of the B-phase contacts of the first AC circuit breaker QF1 and the second AC circuit breaker QF2. The other end of the A-phase contact of the first AC circuit breaker QF1 is connected to the other end of the C-phase contact of the second AC circuit breaker QF2 and then connected to the test equipment DUT. The other end of the C-phase contact of the first AC circuit breaker QF1 is connected to the other end of the A-phase contact of the second AC circuit breaker QF2 and then connected to the test equipment DUT.

[0029] Both the first AC circuit breaker QF1 and the second AC circuit breaker QF2 are 12kV AC circuit breakers. During the forward critical current test, the first AC circuit breaker QF1 is closed and the second AC circuit breaker QF2 is open. During the reverse critical current test, the first AC circuit breaker QF1 is open and the second AC circuit breaker QF2 is closed.

[0030] The PLC control module includes a PLC controller, intermediate relays J1-J4, switches S1-S5, and an emergency stop button S6. One end of switches S1-S5 is connected to the input terminals X0-X4 of the PLC controller, and the other end of switches S1-S5 is connected to the DC24V power supply of the PLC controller. One end of the coils J1-1-J4-1 of intermediate relays J1-J4 is connected to the output terminals Y0-Y4 of the PLC controller, and the other end of the coils J1-1-J4-1 of intermediate relays J1-J4 is connected to the AC220V power supply. The common terminal COMA of the PLC controller is connected to the AC220V power supply via a fuse FUSE.

[0031] One end of contacts J1-2 to J4-2 of intermediate relays J1 to J4 is connected to one end of emergency stop button S6 and then connected to AC 220V power supply.

[0032] The other end of contact J1-2 of intermediate relay J1 is connected to one end of closing coil QF1-1 of first AC circuit breaker QF1.

[0033] The other end of contact J2-2 of intermediate relay J2 is connected to one end of closing coil QF2-1 of second AC circuit breaker QF2.

[0034] The other end of contact J3-2 of intermediate relay J3 is connected to one end of the trip coil QF1-2 of the first AC circuit breaker QF1.

[0035] The other end of contact J4-2 of intermediate relay J4 is connected to one end of the trip coil QF2-2 of the second AC circuit breaker QF2.

[0036] The other end of the emergency stop button S6 is connected to one end of the trip coil J1QF1-1 of the three-phase circuit breaker J1QF1.

[0037] The other ends of the closing coil QF1-1, closing coil QF2-1, opening coil QF1-2, opening coil QF2-2, and opening coil J1QF1-1 are connected to an AC power supply of AC220V.

[0038] like Figure 5 As shown, the PLC controller has QF1 closing intermediate relay M0, QF2 closing intermediate relay M1, J1QF1 closing intermediate relay M2, QF1 opening intermediate relay M3, and QF2 opening intermediate relay M4.

[0039] The QF1 closing intermediate relay M0 has a QF1 closing coil M0-1, a QF1 closing normally open contact M0-2, and a QF1 closing normally closed contact M0-3;

[0040] The QF2 closing intermediate relay M1 has a QF2 closing coil M1-1, a QF2 closing normally open contact M1-2, and a QF2 closing normally closed contact M1-3;

[0041] The J1QF1 closing intermediate relay M2 has a J1QF1 closing coil M2-1 and a J1QF1 closing normally closed contact M2-2;

[0042] The QF1 tripping intermediate relay M3 has a QF1 tripping coil M3-1, a QF1 tripping normally open contact M3-2, and a QF1 tripping normally closed contact M3-3;

[0043] The QF2 tripping intermediate relay M4 has a QF2 tripping coil M4-1, a QF2 tripping normally open contact M4-2, and a QF2 tripping normally closed contact M4-3.

[0044] In this invention, the highest voltage of the test circuit can reach 12kV. Currently, there are almost no DC air circuit breakers with a voltage level of 12kV, and even if they exist, they are extremely expensive. Therefore, the first AC circuit breaker QF1 and the second AC circuit breaker QF2 in the test circuit are two 12kV AC circuit breakers, which cannot interrupt DC current. Therefore, they only close and do not open when the main circuit is energized, and only open when the power is off. Figure 2As shown, the positive critical current test of the testing equipment is achieved by controlling the first AC circuit breaker QF1 to close and the second AC circuit breaker QF2 to open via a PLC controller; Figure 3 As shown, the reverse critical current test of the test equipment is achieved by controlling the first AC circuit breaker QF1 to open and the second AC circuit breaker QF2 to close via a PLC controller. In the PLC controller control, after applying the closing signal to the first AC circuit breaker QF1, QF1 closes, and the second AC circuit breaker QF2 cannot operate. It only operates when the three-phase circuit breaker J1QF1 is open (i.e.,...). Figure 1 In the event of a power outage in the main circuit, a tripping command is sent to either the first AC circuit breaker QF1 or the second AC circuit breaker QF2, and only then can the first AC circuit breaker QF1 or the second AC circuit breaker QF2 trip. Similarly, the operation of the second AC circuit breaker QF2 is the same as that of the first AC circuit breaker QF1.

[0045] The working principle of this utility model is as follows: QF1 closing signal corresponding to switch S1, QF2 closing signal corresponding to switch S2, QF1 opening signal corresponding to switch S3, QF2 opening signal corresponding to switch S4, and J1QF1 closing feedback signal corresponding to switch S5.

[0046] Subsequently, as Figure 4 , Figure 5 , Figure 6 As shown, when switch S1 is closed, with the second AC circuit breaker QF2 open and the three-phase circuit breaker J1QF1 closed, the intermediate relay M0 for closing QF1 is energized and forms a self-locking mechanism. The output terminal Y0 of the PLC controller has an output, and the coil J1-1 of the intermediate relay J1 is energized. Only then does the first AC circuit breaker QF1 close. That is, the normally open contact of the signal input terminal X0 and the normally open contact M0-2 for closing QF1 close simultaneously close. After passing through the normally closed contact M0-3 for closing QF1 and the normally closed contact M4-3 for opening QF2, the coil M0-1 for closing QF1 is energized. Then, the normally open contact M0-2 for closing QF1 closes, the signal output terminal Y0 outputs a signal, the coil J1-1 of the intermediate relay J1 is energized, and the contact J1-2 of the intermediate relay J1 closes. Thus, the coil QF1-1 for closing the first AC circuit breaker QF1 is energized, which means that the first AC circuit breaker QF1 is closed.

[0047] When switch S2 is closed, the normally open contact of signal input terminal X1 and the normally open contact M1-2 of QF2 closing are closed simultaneously. After passing through the normally closed contact M1-3 of QF2 closing and the normally closed contact M3-3 of QF1 opening, the QF2 closing coil M1-1 is energized, and the normally open contact M1-2 of QF2 closing is closed. Signal output terminal Y1 outputs a signal, the coil J2-1 of intermediate relay J2 is energized, and the contact J2-2 of intermediate relay J2 is closed. Then the closing coil QF2-1 of the second AC circuit breaker QF2 is energized, which means that the second AC circuit breaker QF2 is closed.

[0048] When switch S3 is closed, and the three-phase circuit breaker J1QF1 is in the open state, the intermediate relay M3 for QF1 is energized, the output terminal Y2 of the PLC controller has an output, and the coil J3-1 of the intermediate relay J3 is energized, thus opening the first AC circuit breaker QF1. That is, when the normally open contact of the signal input terminal X2 closes, after passing through the normally closed contact M2-2 of J1QF1, the opening coil M3-1 of QF1 is energized, and the normally open contact M3-2 of QF1 is closed. Then, the signal output terminal Y2 outputs a signal, the coil J3-1 of the intermediate relay J3 is energized, and the contact J3-2 of the intermediate relay J3 is closed. Thus, the opening coil QF1-2 of the first AC circuit breaker QF1 is energized, which means that the first AC circuit breaker QF1 is opened.

[0049] When switch S4 is closed, the normally open contact of signal input terminal X3 is closed. After passing through the normally closed contact M2-2 of J1QF1, the trip coil M4-1 of QF2 is energized, and the normally open contact M4-2 of QF2 is closed. Then, signal output terminal Y3 outputs a signal, the coil J4-1 of intermediate relay J4 is energized, and the contact J4-2 of intermediate relay J4 is closed. Then, the trip coil QF2-2 of the second AC circuit breaker QF2 is energized, which means that the second AC circuit breaker QF2 is tripped.

[0050] When switch S5 is closed, the normally open contact of signal input terminal X4 is closed, the closing coil M2-1 of J1QF1 is energized, and the three-phase circuit breaker J1QF1 is closed.

[0051] After the emergency stop button S6 is closed, the trip coil J1QF1-1 of the three-phase circuit breaker J1QF1 is energized, and the three-phase circuit breaker J1QF1 trips. Therefore, in case of emergency, simply pressing the emergency stop button S6 will cut off the power to the DC system without the need for PLC program control.

[0052] In summary, this invention enables the testing equipment to switch between forward and reverse directions, while ensuring that the required voltage is applied to both ends of the testing equipment regardless of the testing method. It can not only perform unidirectional critical current measurement, but also meet the requirements for bidirectional critical current measurement, reducing workload, improving safety factor, and effectively meeting testing requirements.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bi-directional critical current test apparatus, characterized by: Includes three-phase AC power supply, three-phase circuit breaker J1QF1, resistor X R Reactor X L The components include: rectifier transformer ZTM, first AC circuit breaker QF1, second AC circuit breaker QF2, PLC control module, resistor R, and inductor L; the three-phase AC power supply is connected to the three-phase circuit breaker J1QF1 and resistor X. R Reactor X L The rectifier transformer ZTM is connected in sequence. The three-phase circuit breakers J1QF1, QF1, and QF2 are all connected to the PLC control module. The positive output terminal of the rectifier transformer ZTM after the rectification unit is connected to one end of the A-phase contact of both the first AC circuit breaker QF1 and the second AC circuit breaker QF2. The negative output terminal of the rectifier transformer ZTM after the rectification unit is connected to one end of the B-phase contact of both the first AC circuit breaker QF1 and the second AC circuit breaker QF2. The first AC circuit breaker QF1 and the second AC circuit breaker QF2... One end of the C-phase contact of circuit breaker QF2 is connected to one end of the resistor R. The other end of the resistor R is connected to one end of the inductor L. The other end of the inductor L is connected to the other end of the B-phase contacts of the first AC circuit breaker QF1 and the second AC circuit breaker QF2. The other end of the A-phase contact of the first AC circuit breaker QF1 is connected to the other end of the C-phase contact of the second AC circuit breaker QF2 and then connected to the test equipment. The other end of the C-phase contact of the first AC circuit breaker QF1 is connected to the other end of the A-phase contact of the second AC circuit breaker QF2 and then connected to the test equipment.

2. The bidirectional critical current test device of claim 1, wherein: Both the first AC circuit breaker QF1 and the second AC circuit breaker QF2 are 12KV AC circuit breakers.

3. The bidirectional critical current test apparatus of claim 1, wherein: During the forward critical current test, the first AC circuit breaker QF1 is closed and the second AC circuit breaker QF2 is open; during the reverse critical current test, the first AC circuit breaker QF1 is open and the second AC circuit breaker QF2 is closed.

4. The bidirectional critical current test apparatus of claim 1, wherein: The PLC control module includes a PLC controller, intermediate relays J1-J4, switches S1-S5, and an emergency stop button S6. One end of each switch S1-S5 is connected to the input terminals X0-X4 of the PLC controller, and the other end of each switch S1-S5 is connected to the DC24V power supply of the PLC controller. One end of the coils J1-1-J4-1 of the intermediate relays J1-J4 is connected to the output terminals Y0-Y4 of the PLC controller, and the other end of the coils J1-1-J4-1 of the intermediate relays J1-J4 is connected to the AC220V power supply. The common terminal COMA of the PLC controller is connected to the AC220V power supply via a fuse FUSE. One end of contacts J1-2 to J4-2 of the intermediate relays J1 to J4 is connected to one end of the emergency stop button S6 and then connected to an AC 220V power supply. The other end of contact J1-2 of the intermediate relay J1 is connected to one end of the closing coil QF1-1 of the first AC circuit breaker QF1. The other end of contact J2-2 of the intermediate relay J2 is connected to one end of the closing coil QF2-1 of the second AC circuit breaker QF2. The other end of contact J3-2 of the intermediate relay J3 is connected to one end of the trip coil QF1-2 of the first AC circuit breaker QF1. The other end of contact J4-2 of the intermediate relay J4 is connected to one end of the trip coil QF2-2 of the second AC circuit breaker QF2. The other end of the emergency stop button S6 is connected to one end of the trip coil J1QF1-1 of the three-phase circuit breaker J1QF1. The other ends of the closing coil QF1-1, closing coil QF2-1, opening coil QF1-2, opening coil QF2-2, and opening coil J1QF1-1 are connected to an AC power supply of AC220V.

5. A bi-directional critical current test device as claimed in claim 4, wherein: The PLC controller includes a QF1 closing intermediate relay M0, a QF2 closing intermediate relay M1, a J1QF1 closing intermediate relay M2, a QF1 opening intermediate relay M3, and a QF2 opening intermediate relay M4. The QF1 closing intermediate relay M0 has a QF1 closing coil M0-1, a QF1 closing normally open contact M0-2, and a QF1 closing normally closed contact M0-3; The QF2 closing intermediate relay M1 has a QF2 closing coil M1-1, a QF2 closing normally open contact M1-2, and a QF2 closing normally closed contact M1-3; The J1QF1 closing intermediate relay M2 has a J1QF1 closing coil M2-1 and a J1QF1 closing normally closed contact M2-2; The QF1 tripping intermediate relay M3 has a QF1 tripping coil M3-1, a QF1 tripping normally open contact M3-2, and a QF1 tripping normally closed contact M3-3; The QF2 tripping intermediate relay M4 has a QF2 tripping coil M4-1, a QF2 tripping normally open contact M4-2, and a QF2 tripping normally closed contact M4-3.

Images