Alternating current electricity testing locking device and alternating current electricity testing locking method and state prompting method thereof

Abstract

The invention discloses an alternating current electricity testing locking device and an alternating current electricity testing locking method and a state prompting method thereof, and relates to the technical field of electrical equipment. The device comprises a first voltage transformer, a second voltage transformer, an electricity testing locking controller and a disconnecting link closing loop; the electricity testing locking controller is provided with a first electricity testing acquisition channel, a second electricity testing acquisition channel and a first open contact; the first voltage transformer is provided with a first input loop connected to a contact network loop, a first output loop connected to the first electricity testing acquisition channel and a second output loop with a first relay electricity testing structure; the second voltage transformer is provided with a second input loop connected to the contact network loop, a third output loop connected to the second electricity testing acquisition channel, and a fourth output loop with a second relay electricity testing structure; and the first relay electricity testing structure, the second relay electricity testing structure and the first open contact are respectively connected to the disconnecting link closing loop. According to the technical scheme, the electricity testing locking device has a reliable electricity testing locking function.

Description

Technical Field

[0001] The present application relates to the technical field of electric power equipment, and in particular to an AC power test locking device and an AC power test locking method and a status prompt method thereof. Background Art

[0002] For 27.5kV electrified railways, due to the high voltage level, the on-site accurate power testing of the contact network is required to be very high. The traditional 27.5kV high-voltage AC power testing locking device has only one voltage transformer, and there are two power testing channels inside the voltage transformer. The power testing locking controller collects the two power testing channels inside the same voltage transformer. It compares the collected voltage to determine whether the contact network is energized. When it is determined that the contact network is energized, the knife switch closing circuit used to control the closing operation of the electric grounding knife switch in the contact network is locked. However, in actual use, it is found that the AC power testing locking device of this structure, its power testing locking controller not only cannot perform the power testing locking operation on the knife switch closing circuit when any power testing channel in the voltage transformer is abnormal or fails, but also cannot accurately perform the power testing locking operation on the knife switch closing circuit when the power testing locking controller itself is faulty or abnormal. Therefore, the power testing reliability of the existing AC power testing locking device is low, and there is a greater safety risk. Summary of the invention

[0003] The embodiments of the present application provide an AC power test locking device and an AC power test locking method and a status prompt method, aiming to improve the technical problems of the existing AC power test locking device with low power test reliability and great safety risks.

[0004] To this end, an embodiment of the present application provides an AC power test locking device, including a first voltage transformer, a second voltage transformer, a power test locking controller, and a switch closing circuit for controlling an electric grounding switch in a contact network circuit to perform a closing operation, wherein the power test locking controller is provided with a first power test acquisition channel, a second power test acquisition channel, and a first open output contact for outputting the controller power test result; The first voltage transformer is provided with a first input circuit connected to the overhead line circuit, a first output circuit connected to the first power detection collection channel, and a second output circuit having a first relay power detection structure; The second voltage transformer is provided with a second input circuit connected to the overhead line circuit, a third output circuit connected to the second power detection collection channel, and a fourth output circuit having a second relay power detection structure; The first relay power testing structure, the second relay power testing structure and the first output contact are all connected to the knife switch closing circuit to realize the power testing lock of the relay hard power testing and the controller soft power testing.

[0005] Optionally, in some embodiments of the application, a first switch, a second switch, a third switch and a fourth switch are further included; wherein, The first circuit breaker is arranged in the first output circuit and is used to protect the branch where the first output circuit is located; The second circuit breaker is arranged in the second output circuit and is used to protect the branch where the second output circuit is located; The third circuit breaker is arranged in the third output circuit and is used to protect the branch where the third output circuit is located; The fourth circuit breaker is arranged in the fourth output circuit, and is used to protect the branch where the fourth output circuit is located.

[0006] Optionally, in some embodiments of the application, the knife switch closing circuit includes a control circuit for controlling the action of the motor and a power circuit for executing the action of the motor; The first relay power testing structure includes a first relay and a third relay, the first relay is connected in series in the second output circuit, and the normally open contact of the first relay is connected to the power supply coil circuit of the third relay, and the first open output contact and the normally closed contact of the third relay are connected in series to the control circuit; The second relay electrical testing structure includes a second relay and a fourth relay, the second relay is connected in series in the fourth output circuit, and the normally open contact of the second relay is connected to the power supply coil circuit of the fourth relay, and the normally closed contact of the fourth relay is connected to the power circuit.

[0007] Optionally, in some embodiments of the application, it also includes a first indicator light control circuit for controlling the operation of the first indicator light, and the electrical test locking controller is also provided with a second open output contact for outputting the electrical test result of the controller, and the second open output contact, the normally open contact of the third relay and the normally open contact of the fourth relay are all connected to the first indicator light control circuit, and the second open output contact, the normally open contact of the third relay and the normally open contact of the fourth relay are arranged in parallel in the first indicator light control circuit.

[0008] Optionally, in some embodiments of the application, a first self-reset normally open button is further included, and the first self-reset normally open button is respectively connected to the power supply coil circuit of the third relay and the power supply coil circuit of the fourth relay.

[0009] Optionally, in some embodiments of the application, a second indicator light control circuit is also included for controlling the operation of the second indicator light. The electrical test lockout controller is also provided with a third output contact for outputting the controller fault detection result, and the third output contact is connected to the second indicator light control circuit.

[0010] Optionally, in some embodiments of the application, a second self-reset normally open button is further included, and the second self-reset normally open button is connected to the second indicator light control circuit, and the second self-reset normally open button and the third open contact are arranged in parallel in the second indicator light control circuit.

[0011] Optionally, in some embodiments of the application, a self-reset normally closed button and a fifth relay are further included, wherein the self-reset normally closed button and the first group of normally open contacts of the fifth relay are connected in series to the power supply coil circuit of the fifth relay, and the third open output contact is also connected to the power supply coil circuit of the fifth relay, and the third open output contact and the first group of normally open contacts of the fifth relay are arranged in parallel in the power supply coil circuit of the fifth relay; The second group of normally open contacts of the fifth relay is connected to the second indicator light control circuit, and the second group of normally open contacts of the fifth relay and the second self-resetting normally open button are arranged in parallel in the second indicator light control circuit.

[0012] Optionally, in some embodiments of the application, the electrical test locking controller is also provided with a first signal monitoring channel and a second signal monitoring channel, at least one of the auxiliary contacts of the first circuit breaker and the auxiliary contacts of the second circuit breaker is connected to the first signal monitoring channel, and at least one of the auxiliary contacts of the third circuit breaker and the auxiliary contacts of the fourth circuit breaker is connected to the second signal monitoring channel.

[0013] In addition, an embodiment of the present application further provides an AC power test locking method, which is applied to the above-mentioned AC power test locking device. The AC power test locking method includes the following steps: The first output circuit is subjected to a first voltage acquisition through the first electrical detection acquisition channel, and the third output circuit is subjected to a second voltage acquisition through the second electrical detection acquisition channel, so that when the acquisition result of at least one of the first voltage acquisition and the second voltage acquisition is not zero, the first output contact is controlled not to be opened, so as to maintain the disconnected state of the knife switch closing circuit, so as to lock the knife switch closing circuit; The first relay power detection structure performs a first power detection on the second output circuit, so that when the detection result of the first power detection is that there is power, the first relay power detection structure disconnects the knife switch closing circuit to lock the knife switch closing circuit; The second relay power testing structure is used to perform a second power detection on the fourth output circuit, so that when the detection result of the second power detection is that there is power, the second relay power testing structure is used to disconnect the knife switch closing circuit to lock the knife switch closing circuit.

[0014] In addition, an embodiment of the present application further provides an AC power test locking state prompting method, which is applied to the above-mentioned AC power test locking device. The AC power test locking state prompting method includes the following steps: The first output circuit is subjected to a first voltage acquisition through the first electrical detection acquisition channel, and the third output circuit is subjected to a second voltage acquisition through the second electrical detection acquisition channel, so that when the acquisition result of at least one of the first voltage acquisition and the second voltage acquisition is not zero, the second open contact is controlled to open and close to connect the first indicator light control circuit, and the first indicator light is lit; The first relay power detection structure performs a first power detection on the second output circuit, so that when the detection result of the first power detection is that there is power, the first indicator light control circuit is connected through the first relay power detection structure to light up the first indicator light; The second relay power detection structure performs a second power detection on the fourth output circuit, so that when the detection result of the second power detection is that there is power, the first indicator light control circuit is connected through the second relay power detection structure to light up the first indicator light.

[0015] In addition, the embodiment of the present application further provides an AC power test locking state prompting method, which is applied to the above-mentioned AC power test locking device, and the AC power test locking state prompting method includes the following steps: Collecting a first voltage of the first output circuit through the first electrical detection and collection channel to obtain a first voltage; Collect a second voltage of the third output circuit through the second electrical detection and collection channel to obtain a second voltage; The first voltage and the second voltage are compared, and when the voltage difference between the first voltage and the second voltage is greater than a preset threshold, the third output contact is controlled to open and close to connect the second indicator light control circuit and light up the second indicator light.

[0016] In addition, an embodiment of the present application further provides an AC power test locking state prompting method, which is applied to the above-mentioned AC power test locking device. The AC power test locking state prompting method includes the following steps: Monitoring the circuit breaker tripping signal of at least one of the first circuit breaker and the second circuit breaker through the first signal monitoring channel, so that when the first signal monitoring channel detects the circuit breaker tripping signal, the third output contact is controlled to close and connect the second indicator light control circuit to light up the second indicator light; The circuit breaker tripping signal of at least one of the third circuit breaker and the fourth circuit breaker is monitored through the second signal monitoring channel, so that when the second signal monitoring channel detects the circuit breaker tripping signal, the third circuit breaker contact is controlled to close and connect the second indicator light control circuit to light up the second indicator light.

[0017] The technical solution provided by the present application can form an electrical test redundant design through the above-mentioned structural setting, that is, the AC electrical test locking device can, on the one hand, respectively collect one of the output circuits of two different voltage transformers (namely the first voltage transformer and the second voltage transformer) through the electrical test locking controller to realize the controller soft electrical test electrical test locking operation on the corresponding knife switch closing circuit; on the other hand, the first relay electrical test structure can perform a first electrical detection on the other output circuit of the first voltage transformer to realize the relay hard electrical test electrical test locking operation on the corresponding knife switch closing circuit; on the other hand, the second relay electrical test structure can perform a second electrical detection on the other output circuit of the second voltage transformer to realize the relay hard electrical test electrical test locking operation on the corresponding knife switch closing circuit. In this way, no matter if any output circuit of any voltage transformer (the first voltage transformer or the second voltage transformer) fails, or the power test locking controller itself fails or is abnormal, the AC power test locking device can realize the power test locking operation of the corresponding knife switch closing circuit through other power test circuits that have not failed, thereby ensuring that the AC power test locking device has a reliable power test locking function. It can be seen that this technical solution can effectively improve the technical problem that the existing AC power test locking device has low power test reliability and great safety risks. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a partial principle schematic diagram of the AC electric test locking device in the embodiment of the present application; Figure 2 for Figure 1 The schematic diagram of the principle of the knife switch closing circuit of the AC electric test locking device shown; Figure 3 for Figure 1 The schematic diagram of the principle of the tester power supply coil circuit of the AC tester locking device shown; Figure 4 for Figure 1 The schematic diagram of the principle of the first indicator light control circuit of the AC electric test locking device shown; Figure 5 for Figure 1 The schematic diagram of the principle of fault state detection of the AC electric test locking device shown; Figure 6 for Figure 1 The schematic diagram of the principle of circuit breaker signal collection of the AC electric test locking device shown; Figure 7 for Figure 1 The schematic diagram of the fault alarm logic principle of the AC electric test locking device shown; Figure 8 This is a flowchart of the AC power detection locking method in the embodiment of the present application; Fig. 9 This is a first flow chart of the AC power test lockout state prompt method in the embodiment of the present application; Fig.10 This is a second flow chart of the AC power test lockout state prompt method in the embodiment of the present application; Fig.11 This is a third flow chart of the AC power test lockout status prompt method in the embodiment of the present application.

[0018] Description of Figure Numbers: 100. AC voltage test locking device; 111. First input circuit; 112. First output circuit; 113. Second output circuit; 121. Second input circuit; 122. Third output circuit; 123. Fourth output circuit; 140. Knife switch closing circuit; 141. Control circuit; 142. Power circuit; 150. First indicator light control circuit; 160. Second indicator light control circuit. DETAILED DESCRIPTION

[0019] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] In one embodiment, Figure 1 and Figure 2As shown, the embodiment of the present application provides an AC power test locking device 100, which may specifically include a first voltage transformer VT1, a second voltage transformer VT2, a power test locking controller 1n, and a switch closing circuit 140 for controlling the electric grounding knife switch M in the contact network circuit 200 to perform a closing operation, and the power test locking controller 1n is provided with a first power test collection channel, a second power test collection channel, and a first output contact DO4 for outputting the controller power test result. The first voltage transformer VT1 is provided with a first input circuit 111 connected to the contact network circuit 200, a first output circuit 112 connected to the first power test collection channel, and a second output circuit 113 having a first relay power test structure. The second voltage transformer VT2 is provided with a second input circuit 121 connected to the contact network circuit 200, a third output circuit 122 connected to the second power test collection channel, and a fourth output circuit 123 having a second relay power test structure. The first relay power testing structure, the second relay power testing structure and the first output contact DO4 are all connected to the knife switch closing circuit 140 to realize the power testing lock of the relay hard power testing and the controller soft power testing.

[0021] It can be understood that the AC voltage test locking device 100 of the embodiment of the present application is mainly used in the voltage test operation of AC circuits such as the contact network of 27.5kV electrified railways, and when it is applied to the contact network circuit 200 of the electrified railway, it can perform voltage test locking on the closing operation of the electric earthing knife switch M in the contact network circuit 200, that is, when it is detected that the contact network circuit 200 has electricity, the knife switch closing circuit 140 that controls the closing operation of the electric earthing knife switch M is locked, so that at this time the knife switch closing circuit 140 cannot control the electric earthing knife switch M to perform the closing operation.

[0022] Generally speaking, the voltage transformer mentioned above (the first voltage transformer VT1 or the second voltage transformer VT2) is a bipolar voltage transformer, which is connected to the contact network circuit 200 through the primary coil circuit, and then the voltage is reduced to two 100V low voltages through the internal coil mutual inductance, that is, two 100V low voltages are output through two secondary coil circuits. Therefore, the first input circuit 111 mentioned above specifically refers to the primary coil circuit of the first voltage transformer VT1, the first output circuit 112 mentioned above specifically refers to a secondary coil circuit of the first voltage transformer VT1, and the second output circuit 113 mentioned above specifically refers to another secondary coil circuit of the first voltage transformer VT1. Similarly, the second input circuit 121 mentioned above specifically refers to the primary coil circuit of the second voltage transformer VT2, the third output circuit 122 mentioned above specifically refers to a secondary coil circuit of the second voltage transformer VT2, and the fourth output circuit 123 specifically refers to another secondary coil circuit of the second voltage transformer VT2.

[0023] Generally speaking, the overhead contact network circuit 200 of the electrified railway may include an overhead contact network terminal T, a grounding terminal PE (specifically, a rail or an overhead ground wire), and an electric grounding knife switch M. The overhead contact network terminal T and the grounding terminal PE are electrically connected via the electric grounding knife switch M, that is, the two are disconnected or electrically connected via the opening and closing operations of the electric grounding knife switch M. Therefore, the first input circuit 111 mentioned above specifically refers to an external contact point A of the primary coil circuit of the first voltage transformer VT1 connected to the overhead contact network terminal T of the overhead contact network circuit 200, and another external contact point B of the primary coil circuit of the first voltage transformer VT1 connected to the grounding terminal PE of the overhead contact network circuit 200. Similarly, the second input circuit 121 mentioned above connected to the overhead contact network circuit 200 specifically refers to an external contact point A of the primary coil circuit of the second voltage transformer VT2 connected to the overhead contact network terminal T of the overhead contact network circuit 200, and another external contact point B of the primary coil circuit of the second voltage transformer VT2 connected to the grounding terminal PE of the overhead contact network circuit 200. At the same time, since the first input loop 111 and the second input loop 121 are respectively connected to the contact network loop 200, an external contact A of the primary coil loop of the first voltage transformer VT1 and an external contact A of the primary coil loop of the second voltage transformer VT2 are respectively connected to the contact network terminal T of the contact network loop 200 through different branches, and another external contact B of the primary coil loop of the first voltage transformer VT1 and another external contact B of the primary coil loop of the second voltage transformer VT2 are respectively connected to the grounding terminal PE of the contact network loop 200 through different branches.

[0024] Generally speaking, the first test voltage collection channel mentioned above specifically refers to the test voltage collection channel composed of the first voltage collection terminal 2X1 and the voltage common collection terminal 2X4 of the test voltage locking controller 1n, and the second test voltage collection channel mentioned above specifically refers to the test voltage collection channel composed of the second voltage collection terminal 2X2 and the voltage common collection terminal 2X4 of the test voltage locking controller 1n. In addition, the test voltage locking controller 1n also has a spare voltage collection terminal 2X3. Therefore, the first output circuit 112 mentioned above connected to the first test voltage collection channel specifically refers to an external contact 1a of a secondary coil circuit of the first voltage transformer VT1 connected to the first voltage collection terminal 2X1, and another external contact 1b of a secondary coil circuit of the first voltage transformer VT1 connected to the voltage common collection terminal 2X4. In order to enable the first test voltage collection channel to better collect the voltage in the first output circuit 112, at least one sampling resistor is also connected in series between the external contact 1a and the first voltage collection terminal 2X1. Similarly, the third output loop 122 mentioned above is connected to the second voltage test acquisition channel, specifically referring to an external contact 1a of a secondary coil loop of the second voltage transformer VT2 being connected to the second voltage acquisition terminal 2X2, and another external contact 1b of a secondary coil loop of the second voltage transformer VT2 being connected to the voltage common acquisition terminal 2X4, and in order to enable the second voltage test acquisition channel to better acquire the voltage in the third output loop 122, at least one sampling resistor is also connected in series between the external contact 1a and the second voltage acquisition terminal 2X2. Preferably, the sampling resistors mentioned above can be integrated into the same resistor VR. The first open contact DO4 mentioned above is used to output the controller's power test result, which specifically refers to the first open contact DO4 maintaining a normally open state in the knife switch closing circuit 140. When the power test locking controller 1n verifies through any power test collection channel (the first power test collection channel or the second power test collection channel) that the contact network circuit 200 has power, the first open contact DO4 does not open and remains in a normally open state, so as to realize the power test locking of the knife switch closing circuit 140. When the power test locking controller 1n verifies through all power test collection channels (the first power test collection channel and the second power test collection channel) that the contact network circuit 200 has no power, the first open contact DO4 opens and closes, thereby releasing the power test locking state of the knife switch closing circuit 140.

[0025] In addition, the first relay power testing structure, the second relay power testing structure and the first output contact DO4 mentioned above are all connected to the knife switch closing circuit 140 to realize the power testing interlock of the relay hard power testing and the controller soft power testing. Specifically, when the first relay power testing structure and the second relay power testing structure can both detect that there is power in the contact network circuit 200 in their respective power testing circuits, they can disconnect the knife switch closing circuit 140 separately, so that the knife switch closing circuit 140 can no longer control the electric grounding knife switch M to perform the closing operation, thereby realizing the power testing interlock of the relay hard power testing respectively. When the first open contact DO4 can check in the corresponding power testing circuit that the contact network circuit 200 has electricity, it can keep the knife switch closing circuit 140 in the disconnected state, so that the knife switch closing circuit 140 cannot control the electric grounding knife switch M to perform the closing operation, thereby realizing the soft power testing of the relay power testing lock controller, that is, the first relay power testing structure, the second relay power testing structure and the first open contact DO4 are independent of each other in the power testing lock of the knife switch closing circuit 140 and do not affect each other.

[0026] Specifically, for the power testing circuit of the power testing locking controller 1n, it is different from the traditional method of only collecting two power testing channels (i.e., two output circuits) of a voltage transformer, but collects one of the power testing channels (i.e., the first output circuit 112 and the third output circuit 122) of two different voltage transformers (i.e., the first voltage transformer VT1 and the second voltage transformer VT2), that is, the two power testing channels come from different voltage transformers. At this time, only one of the voltage transformers (the first voltage transformer VT1 or the second voltage transformer VT2) needs to be tested for power. When there is power, the power testing locking controller 1n determines that there is power in the contact network circuit 200. At this time, the power testing locking controller 1n controls the first opening contact DO4 not to be opened, and keeps the knife switch closing circuit 140 in the disconnected state, so that the knife switch closing circuit 140 cannot control the electric grounding knife switch M to perform the closing operation. Different from the soft power test method of the power test circuit of the power test lock controller 1n, the power test circuit of the first relay power test structure and the power test circuit of the second relay power test structure are both hard and soft power test methods. Among them, the first relay power test structure generally includes at least one relay, and the normally closed contact of the relay is connected to the knife switch closing circuit 140. At this time, the power supply coil circuit of the relay can be directly or indirectly connected to the second output circuit 113. In this way, when the contact network circuit 200 is energized so that the second output circuit 113 is energized, the power supply coil circuit of the relay is energized to disconnect the normally closed contact of the relay, thereby realizing the power test lock of the knife switch closing circuit 140. Similarly, the second relay power testing structure generally also includes at least one relay, and the normally closed contacts of the relay are also connected to the knife switch closing circuit 140. At this time, the power supply coil circuit of the relay can be directly or indirectly connected to the fourth output circuit 123. In this way, when the contact network circuit 200 is energized so that the fourth output circuit 123 is energized, the power supply coil circuit of the relay can be energized to disconnect the normally closed contacts of the relay, thereby realizing the power testing lock of the knife switch closing circuit 140.

[0027] In this way, the AC power testing locking device 100 of the embodiment of the present application can form a power testing redundant design through the above-mentioned structural setting, that is, the AC power testing locking device 100 can, on the one hand, respectively collect one of the output circuits of two different voltage transformers (namely the first voltage transformer VT1 and the second voltage transformer VT2) through the power testing locking controller 1n to realize the power testing locking operation of the corresponding knife switch closing circuit 140; on the other hand, the first relay power testing structure can perform a first power detection on the other output circuit of the first voltage transformer VT1 to realize the controller soft power testing power testing locking operation of the corresponding knife switch closing circuit 140; on the other hand, the second relay power testing structure can perform a second power detection on the other output circuit of the second voltage transformer VT2 to realize the relay hard power testing power testing locking operation of the corresponding knife switch closing circuit 140. In this way, no matter if any output circuit of any voltage transformer (the first voltage transformer VT1 or the second voltage transformer VT2) fails, or the electrical test locking controller 1n itself fails or is abnormal, the AC electrical test locking device 100 can implement the electrical test locking operation of the corresponding knife switch closing circuit 140 through other electrical test circuits that have not failed, thereby ensuring that the AC electrical test locking device 100 has a reliable electrical test locking function.

[0028] In some examples, such as Figure 1 As shown, the AC electrical test locking device 100 also includes a first circuit breaker QF1, a second circuit breaker QF2, a third circuit breaker QF3 and a fourth circuit breaker QF4. Among them, the first circuit breaker QF1 is arranged in the first output circuit 112, and is used to protect the branch where the first output circuit 112 is located. The second circuit breaker QF2 is arranged in the second output circuit 113, and is used to protect the branch where the second output circuit 113 is located. The third circuit breaker QF3 is arranged in the third output circuit 122, and is used to protect the branch where the third output circuit 122 is located. The fourth circuit breaker QF4 is arranged in the fourth output circuit 123, and is used to protect the branch where the fourth output circuit 123 is located. In this way, through the above-mentioned structural setting, when any one of the first output circuit 112, the second output circuit 113, the third output circuit 122 and the fourth output circuit 123 fails, resulting in overcurrent or leakage, the corresponding circuit breaker (the first circuit breaker QF1, the second circuit breaker QF2, the third circuit breaker QF3 or the fourth circuit breaker QF4) can be tripped to isolate the secondary devices at the rear end from the primary part at the front end, thereby ensuring that the secondary devices connected to the rear end of the corresponding output circuit (the first output circuit 112, the second output circuit 113, the third output circuit 122 or the fourth output circuit 123) will not be damaged due to overcurrent or leakage.

[0029] In some examples, such as Figure 1 , Figure 2 and Figure 3As shown, the knife switch closing circuit 140 includes a control circuit 141 for controlling the motor action and a power circuit 142 for executing the motor action. Among them, the first relay power detection structure includes a first relay KA1 and a third relay KA3. The first relay KA1 is connected in series in the second output circuit 113, and the normally open contact of the first relay KA1 (i.e. Figure 3 The contacts 9 and 5 of KA1 shown in FIG. 1 are connected to the power supply coil circuit of the third relay KA3 (i.e. Figure 3 In the power supply circuit where the power supply coil contacts 13 and 14 of KA3 are located, the first open contact DO4 and the normally closed contact of the third relay KA3 (i.e. Figure 2 The contacts 9 and 1 of KA3 shown in FIG. 1 are connected in series to the control circuit 141. The second relay test structure includes a second relay KA2 and a fourth relay KA4. The second relay KA2 is connected in series to the fourth output circuit 123, and the normally open contact of the second relay KA2 (i.e. Figure 3 The contacts 9 and 5 of KA2 shown in FIG. 1 are connected to the power supply coil circuit of the fourth relay KA4 (i.e. Figure 3 In the power supply circuit where the power supply coil contacts 13 and 14 of KA4 are located, the normally closed contact of the fourth relay KA4 (i.e. Figure 2The contacts 9 and 1) of KA4 shown in the figure are connected to the power circuit 142. In this way, through the above-mentioned structural setting, when the contact network circuit 200 is energized, on the one hand, it will make the second output circuit 113 energized, and then the first relay KA1 is energized. At this time, since the first relay KA1 is energized, it will connect the power supply coil circuit of the third relay KA3 by closing the normally open contact of the first relay KA1, so that the third relay KA3 is energized, so as to disconnect the normally closed contact of the third relay KA3 to disconnect the control circuit 141, and finally realize the relay hard power test and interlocking of the knife switch closing circuit 140; on the other hand, it will make the fourth output circuit 123 energized, and then the second relay KA2 is energized. At this time, since the second relay KA2 is energized, it will connect the power supply coil circuit of the fourth relay KA4 by closing the normally open contact of the second relay KA2, so that the fourth relay KA4 is energized, so as to disconnect the normally closed contact of the fourth relay KA4 to disconnect the power circuit 142, and finally realize the relay hard power test and interlocking of the knife switch closing circuit 140. For the power test circuit of the power test locking controller 1n, when the overhead line circuit 200 is powered, the first output circuit 112 and the third output circuit 122 will be powered, and then when the power test locking controller 1n detects that at least one of the first output circuit 112 and the third output circuit 122 is powered, the first output contact DO4 is controlled not to be opened, so as to keep the first output contact DO4 disconnected from the control circuit 141, and finally realize the power test locking of the controller soft power test on the knife switch closing circuit 140. In addition, through the above-mentioned structural setting, when one of the voltage transformers (the first voltage transformer VT1 or the second voltage transformer VT2) fails, the power test operation on the other voltage transformer (the second voltage transformer VT2 or the first voltage transformer VT1) can also realize the power test locking of the knife switch closing circuit 140 to prevent misoperation.

[0030] It can be understood that in this example, the third relay KA3 and the fourth relay KA4 are both powered by AC, that is, the power supply coil circuit of the third relay KA3 and the power supply coil circuit of the fourth relay KA4 are respectively connected to the input end and the output end of the AC. In this example, the control circuit 141 is also connected to the remote control switch QK REMOTE and the local switch QKLOCAL, which are arranged in parallel in the control circuit 141 to realize the two operation modes of remote operation and local operation of the control circuit 141. In addition, the control circuit 141 in this example is also connected to other opening contacts (DO1 and DO3) and the travel switch S1 of the electric test locking controller 1n, wherein the opening contact DO1 is a remote control closing opening contact, which is connected in series to the branch where the remote control switch QKREMOTE is located, and keeps the normally open state, so as to cooperate with the remote control switch QK REMOTE to realize the remote operation of the control circuit 141. The opening contact DO3 is a closing condition allowing the opening contact, which is kept in a normally open state, and is opened and closed when the electric test locking controller 1n verifies that the closing condition allows, so as to realize the closing control of the control circuit 141. In addition, the control circuit 141 in this example can be specifically the power supply coil circuit of the contactor K1E (i.e. Figure 2 The power supply circuit where the power supply coil contacts A1 and A2 of K1E are located is shown in FIG. 1 ). When the contactor K1E is energized, the contactor K1E is connected in series with two sets of normally open contacts (i.e. Figure 2 As shown in FIG, the contacts 1 and 2 of K1E, and the contacts 3 and 4 of K1E can be closed to connect the power circuit 142.

[0031] In some examples, such as Figure 1 , Figure 3 and Figure 4 As shown, the AC power test locking device 100 also includes a first indicator light control circuit 150 for controlling the operation of the first indicator light HD. The power test locking controller is also provided with a second open contact DO8 for outputting the power test result of the controller. The second open contact DO8 and the normally open contact of the third relay KA3 (i.e. Figure 4 The contacts 12 and 8 of KA3 shown in FIG. 1 and the normally open contact of the fourth relay KA4 (i.e. Figure 4The contacts 12 and 8 of KA4 shown in the figure are connected to the first indicator light control circuit 150, and the second output contact DO8, the normally open contact of the third relay KA3 and the normally open contact of the fourth relay KA4 are arranged in parallel in the first indicator light control circuit 150. In this way, through the above-mentioned structural setting, when the contact network circuit 200 is energized, on the one hand, it will make the second output circuit 113 energized, and then the first relay KA1 is energized. At this time, since the first relay KA1 is energized, it will connect the power supply coil circuit of the third relay KA3 by closing the normally open contact of the first relay KA1, so that the third relay KA3 is energized, and the normally open contact of the third relay KA3 is closed to light up the first indicator light HD to indicate that the contact network circuit 200 is energized; on the other hand, it will make the fourth output circuit 123 energized, and then the second relay KA2 is energized. At this time, since the second relay KA2 is energized, it will connect the power supply coil circuit of the fourth relay KA4 by closing the normally open contact of the second relay KA2, so that the fourth relay KA4 is energized, and the normally open contact of the fourth relay KA4 is closed to light up the first indicator light HD to indicate that the contact network circuit 200 is energized. For the test circuit of the test locking controller 1n, when the contact network circuit 200 is powered, the first output circuit 112 and the third output circuit 122 will be powered, and then when the test locking controller 1n detects that at least one of the first output circuit 112 and the third output circuit 122 is powered, the second output contact DO8 is controlled to open and close to light up the first indicator light HD to indicate that the contact network circuit 200 is powered.

[0032] It can be understood that the first indicator light HD in this example can be used as an indicator light for the contact network to be powered, that is, when it is lit, it indicates that the contact network circuit 200 is powered. The second output contact DO8 in this example is used to output the controller power test result, which specifically means that the second output contact DO8 remains normally open in the first indicator light control circuit 150. When the power test locking controller 1n verifies that the contact network circuit 200 is powered through any power test collection channel (the first power test collection channel or the second power test collection channel), the second output contact DO8 opens and closes to light up the first indicator light HD to indicate that the contact network circuit 200 is powered. When the power test locking controller 1n verifies that the contact network circuit 200 is powered through all power test collection channels (the first power test collection channel and the second power test collection channel), the second output contact DO8 does not open and remains normally open, so that the corresponding branch cannot light up the first indicator light HD.

[0033] In some examples, such as Figure 1 , Figure 3 and Figure 4 As shown, the AC voltage test locking device 100 also includes a first self-resetting normally open button (i.e. Figure 3The button SA shown in FIG. 1 ) is the first self-resetting normally open button (i.e. Figure 3 The contacts 23 and 24 of the button SA shown in the figure are connected to the power supply coil circuit of the third relay KA3 and the power supply coil circuit of the fourth relay KA4 respectively. In this way, through the above-mentioned structural setting, when the first self-reset normally open button is pressed, the power supply coil circuit of the third relay KA3 and the power supply coil circuit of the fourth relay KA4 will be connected. At this time, the coils of the third relay KA3 and the fourth relay KA4 are energized, and the normally open contacts of the third relay KA3 and the normally open contacts of the fourth relay KA4 will be closed respectively, so that the first indicator light HD will be lit. If it is lit, it means that the wiring of the first indicator light HD and its electrical circuit is normal, otherwise it is abnormal. Through this functional design, equipment maintenance personnel can perform self-inspections regularly and in real time to ensure that the first indicator light HD is in normal working condition.

[0034] In some examples, such as Figure 1 , Figure 3 and Figure 5 As shown, the AC power test locking device 100 also includes a second indicator light control circuit 160 for controlling the operation of the second indicator light SD, and the power test locking controller 1n is also provided with a third output contact DO11 for outputting the controller fault detection result, and the third output contact DO11 is connected to the second indicator light control circuit 160. In this way, through the above-mentioned structural setting, the AC power test locking device 100 also has the function of fault self-checking. Since the AC power test locking device 100 adopts two voltage transformers (i.e., the first voltage transformer VT1 and the second voltage transformer VT2), the two power test channels of the power test locking controller 1n collect the voltages of the two voltage transformers, so the power test locking controller 1n can compare the voltage collection results of the two voltage transformers, so that when the voltage difference between the two voltage transformers exceeds the set threshold, the third output contact DO11 is opened and closed, and the second indicator light control circuit 160 is connected to light up the second indicator light SD, thereby realizing fault self-checking. Furthermore, the voltage test locking controller 1n can also comprehensively determine which voltage transformer is faulty based on the voltage values ​​collected from the two voltage transformers.

[0035] It can be understood that the second indicator light SD in this example can be used as a fault indicator light, that is, when it is lit, there is a fault in the AC power test locking device 100. The third output contact DO11 in this example is used to output the controller fault detection result, which specifically means that the third output contact DO11 remains normally open in the second indicator light control circuit 160. When the power test locking controller 1n detects that the AC power test locking device 100 has a fault, the third output contact DO11 opens and closes to light up the second indicator light SD to indicate that the AC power test locking device 100 has a fault. When the power test locking controller 1n does not detect that the AC power test locking device 100 has a fault, the third output contact DO11 does not open and remains normally open, so that the corresponding branch cannot light up the second indicator light SD.

[0036] In some examples, such as Figure 1 , Figure 3 and Figure 5 As shown, the AC voltage test locking device 100 also includes a second self-resetting normally open button (i.e. Figure 5 The button SA with contacts 13 and 14 shown in FIG. 1 ) is a second self-resetting normally open button (i.e. Figure 5 The contacts 13 and 14 of the button SA shown in the figure are connected to the second indicator light control circuit 160, and the second self-reset normally open button and the third open contact DO11 are arranged in parallel in the second indicator light control circuit 160. In this way, through the above-mentioned structural setting, when the second self-reset normally open button is pressed, the second indicator light control circuit 160 can be connected, so that the second indicator light SD will be lit. If it is lit, it means that the wiring of the second indicator light SD and its electrical circuit is normal, otherwise it is abnormal. Through this functional design, equipment maintenance personnel can perform self-inspection in real time on a regular basis to ensure that the second indicator light SD is in normal working condition.

[0037] It can be understood that, in this example, the second self-reset normally open button and the first self-reset normally open button can be the same self-reset normally open button. In this case, the self-reset normally open button is a self-reset normally open button with two sets of contacts, such as Figure 3 and Figure 5 As shown, the switch control formed by a group of contacts of button SA (i.e., contacts 13 and 14) is used as the second self-reset normally open button mentioned above, and the switch control formed by another group of contacts of button SA (i.e., contacts 23 and 24) is used as the first self-reset normally open button mentioned above.

[0038] In some examples, such as Figure 1 , Figure 3 and Figure 5 As shown, the AC electric test locking device 100 also includes a self-resetting normally closed button RESET and a fifth relay KA5, and the self-resetting normally closed button RESET and the first group of normally open contacts of the fifth relay KA5 (i.e. Figure 5 The contacts 9 and 5 of KA5 shown in FIG. 1 are connected in series to the power supply coil circuit of the fifth relay KA5 (i.e. Figure 5 The power supply coil contacts 13 and 14 of the fifth relay KA5 are located in the power supply circuit, and the third output contact DO11 is also connected to the power supply coil circuit of the fifth relay KA5. The third output contact DO11 and the first group of normally open contacts of the fifth relay KA5 are arranged in parallel in the power supply coil circuit of the fifth relay KA5. The second group of normally open contacts of the fifth relay KA5 (i.e. Figure 5 The contacts 12 and 8 of KA5 shown in the figure are connected to the second indicator light control circuit 160, and the second group of normally open contacts and the second self-reset normally open button of the fifth relay KA5 are arranged in parallel in the second indicator light control circuit 160. In this way, through the above-mentioned structural setting, the indirect connection of the third output contact DO11 to the second indicator light control circuit 160 can be well realized. At this time, when the electric test locking controller 1n fails, it will control the third output contact DO11 as a fault output, so that the contact of the third output contact DO11 is closed to connect the power supply coil circuit of the fifth relay KA5, so that the fifth relay KA5 is energized, and the two groups of normally open contacts of the fifth relay KA5 (i.e., the first group of normally open contacts and the second group of normally open contacts) are closed respectively. In the power supply coil circuit of the fifth relay KA5, since the first group of normally open contacts of the fifth relay KA5 is closed, the power supply coil circuit of the fifth relay KA5 is continuously energized and in a self-holding state (so the power supply coil circuit of the fifth relay KA5 is also called the self-holding circuit of the device). At the same time, due to the closure of the second group of normally open contacts of the fifth relay KA5, the second indicator light control circuit 160 is connected, and the second indicator light SD is always on. When the equipment maintenance personnel find that the second indicator light SD is on during the inspection, the equipment needs to be repaired. For example, after the fault of the electric test lock controller 1n is removed, the third open contact DO11 is opened and retracted. Due to the self-holding of the fifth relay KA5 at this time, the second indicator light SD remains always on. At this time, the equipment maintenance personnel press the self-reset normally closed button RESET to disconnect the power supply coil circuit of the fifth relay KA5, so that the second indicator light SD is extinguished and the equipment returns to normal. In this way, through the above function settings, the equipment maintenance personnel can observe the equipment fault in time and solve the fault problem in time. The purpose of manually resetting and extinguishing the second indicator light SD is mainly to force the equipment maintenance personnel to go to the site to manually confirm the fault solution after the fault is solved. After confirming that there is no problem, manually press the self-reset normally closed button RESET to extinguish the second indicator light SD.

[0039] In some examples, such as Figure 1 , Figure 5 and Figure 6As shown, the electric test locking controller 1n is also provided with a first signal monitoring channel (ie Figure 6 The signal acquisition terminals 1X12 and YX12 of the electric test locking controller 1n shown in the figure constitute a signal monitoring channel) and a second signal monitoring channel (i.e. Figure 6 The signal acquisition terminals 1X13 and YX13 of the electric test locking controller 1n shown in the figure constitute a signal monitoring channel), the auxiliary contact of the first circuit breaker QF1 (i.e. Figure 6 The contacts 11 and 14 of QF1 and the secondary contacts of the second open circuit QF2 (i.e. Figure 6 At least one of the contacts 11 and 14 of QF2 shown in FIG. 1 is connected to the first signal monitoring channel, and the auxiliary contact of the third circuit breaker QF3 (i.e. Figure 6 The contacts 11 and 14 of QF3 shown in FIG. 1 and the auxiliary contact of the fourth open circuit QF4 (i.e. Figure 6 At least one of the contacts 11 and 14 of QF4 shown in FIG1 is connected to the second signal monitoring channel. Thus, through the above-mentioned structural setting, when any voltage transformer (the first voltage transformer VT1 or the second voltage transformer VT2) has an abnormality that causes the circuit breaker in its output circuit to trip, its power-testing locking controller 1n will monitor the corresponding circuit breaker tripping position change signal through the corresponding signal monitoring channel (the first signal monitoring channel or the second signal monitoring channel) to control the third output contact DO11 to open, connect the second indicator light control circuit 160, and light up the second indicator light SD. In this way, the fault self-detection function of the two voltage transformers (the first voltage transformer VT1 and the second voltage transformer VT2) can be realized.

[0040] It can be understood that, in addition to the auxiliary contacts, the first circuit breaker QF1 in this example also has a main contact (not shown in the figure) connected to the first output circuit 112. In addition to the auxiliary contacts, the second circuit breaker QF2 in this example also has a main contact (i.e., connected to the second output circuit 113 and the power supply coil circuit of the third relay KA3) respectively. Figure 3 or Figure 5 In this example, the third circuit breaker QF3 has not only the auxiliary contacts but also the main contacts (not shown) connected to the third output circuit 122. In this example, the fourth circuit breaker QF4 has not only the auxiliary contacts but also the main contacts (i.e. Figure 3 or Figure 5 The contacts 21 and 24 of QF4 are shown in FIG.

[0041] In addition, the AC voltage test locking device 100 has many functions, and the status monitoring of these functions must be realized through the voltage test locking controller 1n. If the function cannot meet the original set parameters, or the function is in an abnormal state, it needs to be input to the voltage test locking controller 1n in a remote signaling manner, and the voltage test locking controller 1n will control the third output contact DO11 to open and close. Control the third output contact DO11 to open and close as the alarm output of the voltage test locking controller 1n. As long as the logic of the fault alarm setting is met, the third output contact DO11 will open and close, and the second indicator light SD will be lit. The fault alarm logic of the third output contact DO11 can be specifically as follows Figure 7 As shown, including: 1. Monitoring of VT1 and VT2 output signals: The circuit breakers QF1 / QF2 / QF3 / QF4 in the output circuits of the first voltage transformer VT1 and the second voltage transformer VT2 are used as signal inputs and connected to the input of the voltage test interlocking controller 1n. If a tripping position change occurs, the voltage test interlocking controller 1n will execute the DO11 output closure and light up the second indicator light SD. The same principle applies to the following.

[0042] 2. Operation power supply monitoring: monitor the circuit breaker of the grounding knife switch motor circuit. If the motor circuit has an abnormal circuit breaker trip, the power test locking controller 1n will execute DO11 to open and close.

[0043] 3. Parameter verification error: In order to ensure the accuracy of the parameters set inside the power-checking interlocking controller 1n, the parameters need to be verified. If the verification is wrong, the power-checking interlocking controller 1n will execute DO11 opening and closing.

[0044] 4. Heating circuit is broken: There are heating detection components in the electric heater circuit inside the grounding device. If it is detected that the electric heater circuit is broken, the electrical test locking controller 1n will execute DO11 opening and closing.

[0045] 5. Heating timeout: If the electric heating time exceeds the set time, the electric test locking controller 1n will execute DO11 opening and closing.

[0046] 6. Temperature and humidity sensor communication failure: If the RS485 communication between the temperature and humidity sensor and the voltage test locking controller 1n fails, the voltage test locking controller 1n will execute DO11 opening and closing.

[0047] 7. The voltage difference between the two networks is greater than 0.1Un: When the voltage difference between VT1 and VT2 collected by the power testing interlocking controller 1n exceeds 0.1Un or the set threshold, the power testing interlocking controller 1n will execute DO11 opening and closing.

[0048] 8. The grounding switch position is neither open nor closed: When the grounding switch position is in an abnormal position neither open nor closed, the voltage test locking controller 1n will execute DO11 to open and close.

[0049] 9. Motor quick-break: There is a current detection element in the power circuit of the motor. When it is detected that the current flowing through the motor is greater than 6A or the set threshold, the motor is controlled to perform a quick-break operation. At this time, the voltage test locking controller 1n will execute DO11 opening and closing.

[0050] 10. Motor overcurrent: There is a current detection element in the power circuit of the motor. When it is detected that the current flowing through the motor is greater than 0.75A or the set threshold, the controller will report that the motor is overcurrent, and the current detection locking controller 1n will execute DO11 to open and close.

[0051] 11. Communication interruption between the controller and the background: When the communication between the power test locking controller 1n and the system background is interrupted, the power test locking controller 1n will execute DO11 opening and closing.

[0052] 12. Communication interruption between the controller and external devices: When the communication between the voltage test locking controller 1n and external devices (such as LED display screen, electronic sign, ground indicator light, etc.) is interrupted, the voltage test locking controller 1n will execute DO11 opening and closing.

[0053] In one embodiment, Figure 8 As shown, the embodiment of the present application further provides an AC power test locking method, which is applied to the AC power test locking device 100 of the above embodiment. The AC power test locking method may specifically include the following steps: Step S110: Perform a first voltage acquisition on the first output circuit through the first electrical test acquisition channel, and perform a second voltage acquisition on the third output circuit through the second electrical test acquisition channel, so that when the acquisition result of at least one of the first voltage acquisition and the second voltage acquisition is not zero, the first output contact is controlled not to be opened, so as to maintain the disconnected state of the knife switch closing circuit, so as to lock the knife switch closing circuit.

[0054] It is understandable that if Figures 1 to 3As shown, for the power testing circuit of the power testing locking controller 1n, it is different from the traditional method of only collecting two power testing channels (i.e., two output circuits) of one voltage transformer, and collects one of the power testing channels (i.e., the first output circuit 112 and the third output circuit 122) of two different voltage transformers (i.e., the first voltage transformer VT1 and the second voltage transformer VT2), that is, the two power testing channels come from different voltage transformers respectively. At this time, only one of the voltage transformers (the first voltage transformer VT1 or the second voltage transformer VT2) needs to be tested for power. When there is power, the power testing locking controller 1n determines that there is power in the contact network circuit 200. At this time, the power testing locking controller 1n controls the first opening contact DO4 not to be opened, and keeps the knife switch closing circuit 140 in the disconnected state, so that the knife switch closing circuit 140 can no longer control the electric grounding knife switch M to perform the closing operation.

[0055] Step S120: Perform a first power detection on the second output circuit through the first relay power detection structure, so that when the detection result of the first power detection is that there is power, the knife switch closing circuit is disconnected through the first relay power detection structure to lock the knife switch closing circuit.

[0056] It is understandable that if Figures 1 to 3 As shown, the first relay power testing structure generally includes at least one relay, and the normally closed contacts of the relay are connected to the knife switch closing circuit 140. At this time, the power supply coil circuit of the relay can be directly or indirectly connected to the second output circuit 113. In this way, when the contact network circuit 200 is energized so that the second output circuit 113 is energized (that is, the detection result of the first power detection is that there is power), the power supply coil circuit of the relay is energized to disconnect the normally closed contacts of the relay, thereby realizing the power testing lock of the knife switch closing circuit 140.

[0057] Step S130: Perform a second power detection on the fourth output circuit through the second relay power detection structure, so that when the detection result of the second power detection is that there is power, the knife switch closing circuit is disconnected through the second relay power detection structure to lock the knife switch closing circuit.

[0058] It is understandable that if Figures 1 to 3 As shown, the second relay power testing structure generally also includes at least one relay, and the normally closed contacts of the relay are also connected to the knife switch closing circuit 140. At this time, the power supply coil circuit of the relay can be directly or indirectly connected to the fourth output circuit 123. In this way, when the contact network circuit 200 is energized so that the fourth output circuit 123 is energized (that is, the detection result of the second power detection is that there is power), the power supply coil circuit of the relay is energized to disconnect the normally closed contacts of the relay, thereby realizing the power testing lock of the knife switch closing circuit 140.

[0059] In this way, the AC electrical testing method of the embodiment of the present application can form an electrical testing redundant design through the above-mentioned method steps, that is, no matter any output circuit of any voltage transformer (the first voltage transformer VT1 or the second voltage transformer VT2) fails, or the electrical testing locking controller 1n itself fails or is abnormal, its AC electrical testing locking device 100 can realize the electrical testing locking operation of the corresponding knife switch closing circuit 140 through other electrical testing circuits that have not failed, thereby ensuring that its AC electrical testing locking method has a reliable electrical testing locking function.

[0060] In one embodiment, Fig. 9 As shown, the embodiment of the present application also provides an AC power test locking state prompting method, which is applied to the AC power test locking device 100 of the above embodiment. The AC power test locking state prompting method includes the following steps: Step S210: Perform a first voltage acquisition on the first output circuit through the first electrical test acquisition channel, and perform a second voltage acquisition on the third output circuit through the second electrical test acquisition channel, so that when the acquisition result of at least one of the first voltage acquisition and the second voltage acquisition is not zero, the second output contact is controlled to open and close to connect the first indicator light control circuit and light up the first indicator light.

[0061] It is understandable that if Figure 1 , Figure 3 and Figure 4 As shown, for the test circuit of the test locking controller 1n, when the contact network circuit 200 is powered, the first output circuit 112 and the third output circuit 122 will be powered, and then the first test collection channel and the second test collection channel of the test locking controller 1n will detect that at least one of the first output circuit 112 and the third output circuit 122 is powered, and the second open contact DO8 will be controlled to open and close to connect the first indicator light control circuit 150 to light up the first indicator light HD to indicate that the contact network circuit 200 is powered.

[0062] Step S220: performing a first power detection on the second output circuit through the first relay power detection structure, so that when the detection result of the first power detection is that there is power, the first indicator light control circuit is connected through the first relay power detection structure to light up the first indicator light.

[0063] It is understandable that if Figure 1 , Figure 3 and Figure 4As shown, the first relay power testing structure generally includes at least one relay, and the normally open contact of the relay is connected to the first indicator light control circuit 150. At this time, the power supply coil circuit of the relay can be directly or indirectly connected to the second output circuit 113. In this way, when the contact network circuit 200 is energized so that the second output circuit 113 is energized (that is, the detection result of the first power detection is that there is power), the power supply coil circuit of the relay is energized to close the normally open contact of the relay to light up the first indicator light HD to indicate that there is power in the contact network circuit 200.

[0064] Step S230: Perform a second power detection on the fourth output circuit through the second relay power detection structure, so that when the detection result of the second power detection is that there is power, the first indicator light control circuit is connected through the second relay power detection structure to light up the first indicator light.

[0065] It is understandable that if Figure 1 , Figure 3 and Figure 4 As shown, the second relay power testing structure generally includes at least one relay, and the normally open contact of the relay is connected to the first indicator light control circuit 150. At this time, the power supply coil circuit of the relay can be directly or indirectly connected to the fourth output circuit 123. In this way, when the contact network circuit 200 is energized so that the fourth output circuit 123 is energized (that is, the detection result of the second power detection is that there is power), the power supply coil circuit of the relay is energized to close the normally open contact of the relay to light up the first indicator light HD to indicate that the contact network circuit 200 is energized.

[0066] In this way, the AC power test lockout status indication method of the embodiment of the present application can form a power test redundant design through the above method steps, that is, no matter any output circuit of any voltage transformer (the first voltage transformer VT1 or the second voltage transformer VT2) fails, or the power test lockout controller 1n itself fails or is abnormal, the AC power test lockout device 100 can realize the power test operation of the contact network circuit 200 through other power test circuits that have not failed, ensure the accurate power test of the contact network circuit 200, and when it is tested that the contact network circuit 200 has power, promptly indicate the power status through the first indicator light HD.

[0067] In one embodiment, Fig.10 As shown, the embodiment of the present application also provides an AC power test locking state prompting method, which is applied to the AC power test locking device 100 of the above embodiment. The AC power test locking state prompting method includes the following steps: Step S310: collecting a first voltage of a first output circuit through a first electrical detection and collection channel to obtain a first voltage.

[0068] Step S320: collecting a second voltage on the third output circuit through a second electrical detection collection channel to obtain a second voltage.

[0069] Step S330: Compare the first voltage and the second voltage, and when the voltage difference between the first voltage and the second voltage is greater than a preset threshold, control the third open / close contact to open and close the second indicator light control circuit to light up the second indicator light.

[0070] It is understandable that if Figure 1 , Figure 3 and Figure 5 As shown, since the AC power test locking device 100 uses two voltage transformers (i.e., the first voltage transformer VT1 and the second voltage transformer VT2), the two power test channels of the power test locking controller 1n collect the voltages of the two voltage transformers (i.e., the first voltage collected through the first output circuit 112 of the first voltage transformer VT1 and the second voltage collected through the third output circuit 122 of the second voltage transformer VT2). Therefore, the power test locking controller 1n can compare the voltage collection results of the two voltage transformers, so that when the voltage difference between the two voltage transformers (i.e., the voltage difference between the first voltage and the second voltage) is greater than the preset threshold, the third output contact DO11 is controlled to open and close to connect the second indicator light control circuit 160, and the second indicator light SD is lit, thereby realizing fault self-checking. Furthermore, the power test locking controller 1n can also comprehensively determine which voltage transformer (the first voltage transformer VT1 or the second voltage transformer VT2) is faulty based on the voltage values ​​of the two voltage transformers (i.e., the voltage values ​​of the first voltage and the second voltage) collected.

[0071] In this way, the AC current test locking status indication method of the embodiment of the present application, through the above-mentioned method steps, can promptly indicate the fault status through the second indicator light SD when at least one of the first voltage transformer VT1 and the second voltage transformer VT2 fails, so as to realize the fault self-detection function of the AC current test locking device 100.

[0072] In one embodiment, Fig.11 As shown, the embodiment of the present application also provides an AC power test locking state prompting method, which is applied to the AC power test locking device 100 of the above embodiment. The AC power test locking state prompting method includes the following steps: Step S410: Monitor the circuit breaker tripping signal of at least one of the first circuit breaker and the second circuit breaker through the first signal monitoring channel, so that when the circuit breaker tripping signal is detected through the first signal monitoring channel, the third output contact is controlled to close and connect the second indicator light control circuit to light up the second indicator light.

[0073] It is understandable that if Figure 1 , Figure 5 and Figure 6 As shown, when an abnormality occurs in the first voltage transformer VT1, causing the circuit breaker (i.e., the first circuit breaker QF1 and the second circuit breaker QF2) in its output circuit to trip, its voltage test locking controller 1n can monitor the change signal of the corresponding circuit breaker (i.e., the first circuit breaker QF1 and / or the second circuit breaker QF2) tripping through the first signal monitoring channel. At this time, the third output contact DO11 can be controlled to open and close to connect the second indicator light control circuit 160, thereby lighting up the second indicator light SD.

[0074] Step S420: Monitor the circuit breaker tripping signal of at least one of the third circuit breaker and the fourth circuit breaker through the second signal monitoring channel, so that when the circuit breaker tripping signal is detected through the second signal monitoring channel, the third output contact is controlled to close and connect the second indicator light control circuit to light up the second indicator light.

[0075] It is understandable that if Figure 1 , Figure 5 and Figure 6 As shown, when an abnormality occurs in the second voltage transformer VT2, causing the circuit breaker (i.e., the third circuit breaker QF3 and the fourth circuit breaker QF4) in its output circuit to trip, its voltage test locking controller 1n can monitor the change signal of the corresponding circuit breaker (i.e., the third circuit breaker QF3 and / or the fourth circuit breaker QF4) tripping through the second signal monitoring channel. At this time, the third output contact DO11 can be controlled to open and close to connect the second indicator light control circuit 160, thereby lighting up the second indicator light SD.

[0076] In this way, the AC current test lockout status indication method of the embodiment of the present application can realize the fault self-detection function of the two voltage transformers (the first voltage transformer VT1 and the second voltage transformer VT2) through the above method steps, that is, when any voltage transformer fails or both voltage transformers fail, the second indicator light SD can promptly indicate the fault status.

[0077] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An AC electric test locking device, characterized in that: It includes a first voltage transformer, a second voltage transformer, an electric test locking controller and a switch closing circuit for controlling the electric grounding switch in the contact network circuit to perform a closing operation, and the electric test locking controller is provided with a first electric test collection channel, a second electric test collection channel and a first open output contact for outputting the controller's electric test result; The first voltage transformer is provided with a first input circuit connected to the overhead line circuit, a first output circuit connected to the first power detection collection channel, and a second output circuit having a first relay power detection structure; The second voltage transformer is provided with a second input circuit connected to the overhead line circuit, a third output circuit connected to the second power detection collection channel, and a fourth output circuit having a second relay power detection structure; The first relay power testing structure, the second relay power testing structure and the first output contact are all connected to the knife switch closing circuit to realize the power testing lock of the relay hard power testing and the controller soft power testing.

2. The AC voltage test locking device according to claim 1, characterized in that: It also includes a first space switch, a second space switch, a third space switch and a fourth space switch; wherein, The first circuit breaker is arranged in the first output circuit and is used to protect the branch where the first output circuit is located; The second circuit breaker is arranged in the second output circuit and is used to protect the branch where the second output circuit is located; The third circuit breaker is arranged in the third output circuit and is used to protect the branch where the third output circuit is located; The fourth circuit breaker is arranged in the fourth output circuit, and is used to protect the branch where the fourth output circuit is located.

3. The AC voltage test locking device according to claim 1, characterized in that: The knife switch closing circuit includes a control circuit for controlling the action of the motor and a power circuit for executing the action of the motor; The first relay power testing structure includes a first relay and a third relay, the first relay is connected in series in the second output circuit, and the normally open contact of the first relay is connected to the power supply coil circuit of the third relay, and the first open output contact and the normally closed contact of the third relay are connected in series to the control circuit; The second relay electrical testing structure includes a second relay and a fourth relay, the second relay is connected in series in the fourth output circuit, and the normally open contact of the second relay is connected to the power supply coil circuit of the fourth relay, and the normally closed contact of the fourth relay is connected to the power circuit.

4. The AC voltage test locking device according to claim 3, characterized in that: It also includes a first indicator light control circuit for controlling the operation of the first indicator light. The electrical test locking controller is also provided with a second open output contact for outputting the electrical test result of the controller. The second open output contact, the normally open contact of the third relay and the normally open contact of the fourth relay are all connected to the first indicator light control circuit, and the second open output contact, the normally open contact of the third relay and the normally open contact of the fourth relay are arranged in parallel in the first indicator light control circuit.

5. The AC voltage test locking device according to claim 4, characterized in that: It also includes a first self-reset normally open button, which is respectively connected to the power supply coil loop of the third relay and the power supply coil loop of the fourth relay.

6. The AC voltage test locking device according to claim 2, characterized in that: It also includes a second indicator light control circuit for controlling the operation of the second indicator light. The electrical test locking controller is also provided with a third output contact for outputting the controller fault detection result. The third output contact is connected to the second indicator light control circuit.

7. The AC voltage test locking device according to claim 6, characterized in that: It also includes a second self-resetting normally open button, which is connected to the second indicator light control circuit, and the second self-resetting normally open button and the third open contact are arranged in parallel in the second indicator light control circuit.

8. The AC voltage test locking device according to claim 7, characterized in that: It also includes a self-reset normally closed button and a fifth relay, wherein the self-reset normally closed button and a first group of normally open contacts of the fifth relay are connected in series to a power supply coil circuit of the fifth relay, and the third open contact is also connected to the power supply coil circuit of the fifth relay, and the third open contact and the first group of normally open contacts of the fifth relay are arranged in parallel in the power supply coil circuit of the fifth relay; The second group of normally open contacts of the fifth relay is connected to the second indicator light control circuit, and the second group of normally open contacts of the fifth relay and the second self-resetting normally open button are arranged in parallel in the second indicator light control circuit.

9. The AC voltage test locking device according to claim 6, characterized in that: The electrical test locking controller is also provided with a first signal monitoring channel and a second signal monitoring channel, at least one of the auxiliary contacts of the first circuit breaker and the auxiliary contacts of the second circuit breaker is connected to the first signal monitoring channel, and at least one of the auxiliary contacts of the third circuit breaker and the auxiliary contacts of the fourth circuit breaker is connected to the second signal monitoring channel.

10. An AC power test locking method, characterized in that: Applied to the AC power test locking device as described in any one of claims 1 to 9, the AC power test locking method comprises the following steps: The first output circuit is subjected to a first voltage acquisition through the first electrical detection acquisition channel, and the third output circuit is subjected to a second voltage acquisition through the second electrical detection acquisition channel, so that when the acquisition result of at least one of the first voltage acquisition and the second voltage acquisition is not zero, the first output contact is controlled not to be opened, so as to maintain the disconnected state of the knife switch closing circuit, so as to lock the knife switch closing circuit; The first relay power detection structure performs a first power detection on the second output circuit, so that when the detection result of the first power detection is that there is power, the first relay power detection structure disconnects the knife switch closing circuit to lock the knife switch closing circuit; The second relay power testing structure is used to perform a second power detection on the fourth output circuit, so that when the detection result of the second power detection is that there is power, the second relay power testing structure is used to disconnect the knife switch closing circuit to lock the knife switch closing circuit.

11. An AC power test lockout status prompt method, characterized in that: Applied to the AC power test locking device as claimed in claim 4 or 5, the AC power test locking state prompting method comprises the following steps: The first output circuit is subjected to a first voltage acquisition through the first electrical detection acquisition channel, and the third output circuit is subjected to a second voltage acquisition through the second electrical detection acquisition channel, so that when the acquisition result of at least one of the first voltage acquisition and the second voltage acquisition is not zero, the second output contact is controlled to open and close to connect the first indicator light control circuit and light up the first indicator light; The first relay power detection structure performs a first power detection on the second output circuit, so that when the detection result of the first power detection is that there is power, the first indicator light control circuit is connected through the first relay power detection structure to light up the first indicator light; The second relay power detection structure performs a second power detection on the fourth output circuit, so that when the detection result of the second power detection is that there is power, the first indicator light control circuit is connected through the second relay power detection structure to light up the first indicator light.

12. An AC power test lockout status prompt method, characterized in that: Applied to the AC power test locking device as described in any one of claims 6 to 9, the AC power test locking state prompting method comprises the following steps: Collecting a first voltage of the first output circuit through the first electrical detection and collection channel to obtain a first voltage; Collect a second voltage of the third output circuit through the second electrical detection and collection channel to obtain a second voltage; The first voltage and the second voltage are compared, and when the voltage difference between the first voltage and the second voltage is greater than a preset threshold, the third output contact is controlled to open and close to connect the second indicator light control circuit and light up the second indicator light.

13. An AC power test lockout status prompt method, characterized in that: Applied to the AC power test locking device as claimed in claim 9, the AC power test locking state prompting method comprises the following steps: Monitoring the circuit breaker tripping signal of at least one of the first circuit breaker and the second circuit breaker through the first signal monitoring channel, so that when the first signal monitoring channel detects the circuit breaker tripping signal, the third output contact is controlled to close and connect the second indicator light control circuit to light up the second indicator light; The circuit breaker tripping signal of at least one of the third circuit breaker and the fourth circuit breaker is monitored through the second signal monitoring channel, so that when the second signal monitoring channel detects the circuit breaker tripping signal, the third circuit breaker output contact is controlled to close and connect the second indicator light control circuit to light up the second indicator light.

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