AC power test locking device and AC power test locking method and status prompt method

Abstract

The present application discloses an AC current test locking device and an AC current test locking method and a status prompt method thereof, which relate to the technical field of power equipment. The device includes a first voltage transformer, a second voltage transformer, a current test locking controller, and a knife switch closing circuit. The current test locking controller is provided with a first current test acquisition channel, a second current test acquisition channel, and a first output contact. The first voltage transformer is provided with a first input circuit connected to the contact network circuit, a first output circuit connected to the first current test acquisition channel, and a second output circuit having a first relay current test structure. The second voltage transformer is provided with a second input circuit connected to the contact network circuit, a third output circuit connected to the second current test acquisition channel, and a fourth output circuit having a second relay current test structure. The first relay current test structure, the second relay current test structure, and the first output contact are respectively connected to the knife switch closing circuit. This technical solution has a reliable current test locking function.

Description

Technical Field

[0001] The present application relates to the technical field of 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] Due to the high voltage level of 27.5kV electrified railways, on-site accurate electrical testing of the contact network is highly demanding. Conventional 27.5kV high-voltage AC electrical testing and locking devices consist of a single voltage transformer (VT) with two internal testing channels. The testing and locking controller collects data from both channels within the VT and compares the collected voltages to determine whether the contact network is energized. If the VT is energized, the circuit breaker closing circuit, which controls the closing of the electric earthing switch in the contact network, is locked. However, in actual use, it has been found that the testing and locking controller of this AC electrical testing and locking device not only fails to perform the testing and locking operation on the circuit breaker closing circuit if any of the VT testing channels experiences an anomaly or fault, but also fails to accurately perform the testing and locking operation on the circuit breaker closing circuit if the testing and locking controller itself experiences a fault or abnormality. Consequently, existing AC electrical testing and locking devices have low electrical testing reliability and pose significant safety risks. Summary of the Invention

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

[0004] To this end, an embodiment of the present application provides an AC electric test locking device, comprising a first voltage transformer, a second voltage transformer, an electric test locking controller, and a switch closing circuit for controlling the electric earthing switch in the overhead contact circuit to perform a closing operation. The electric test locking controller is provided with a first electric test acquisition channel, a second electric test acquisition channel, and a first open output contact for outputting the controller's electric test results;

[0005] The first voltage transformer is provided with a first input circuit connected to the contact network circuit, a first output circuit connected to the first power detection acquisition channel, and a second output circuit having a first relay power detection structure;

[0006] The second voltage transformer is provided with a second input circuit connected to the contact network circuit, a third output circuit connected to the second power detection acquisition channel, and a fourth output circuit having a second relay power detection structure;

[0007] 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 power testing lockout of hard power testing of the relay and soft power testing of the controller.

[0008] Optionally, in some embodiments of the application, a first circuit breaker, a second circuit breaker, a third circuit breaker and a fourth circuit breaker are further included; wherein,

[0009] The first circuit breaker is provided in the first output circuit and is used to protect the branch circuit where the first output circuit is located;

[0010] The second circuit breaker is provided in the second output circuit and is used to protect the branch circuit where the second output circuit is located;

[0011] The third circuit breaker is provided in the third output circuit and is used to protect the branch circuit where the third output circuit is located;

[0012] The fourth circuit breaker is provided in the fourth output circuit and is used to protect the branch circuit where the fourth output circuit is located.

[0013] 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;

[0014] The first relay power detection 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;

[0015] 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.

[0016] Optionally, in some embodiments of the application, a first indicator light control circuit is further included 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.

[0017] 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.

[0018] Optionally, in some embodiments of the application, a second indicator light control circuit is further 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.

[0019] 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.

[0020] 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 power supply coil circuit of the fifth relay is also connected to the third open output contact, 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;

[0021] 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-reset normally open button are arranged in parallel in the second indicator light control circuit.

[0022] 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.

[0023] In addition, an embodiment of the present application further provides an AC electrical test locking method, which is applied to the above-mentioned AC electrical test locking device. The AC electrical test locking method includes the following steps:

[0024] Performing a first voltage acquisition on the first output circuit through the first electrical detection acquisition channel, and performing a second voltage acquisition on the third output circuit through the second electrical detection acquisition channel, so that when a collection 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, thereby maintaining the disconnected state of the knife switch closing circuit, thereby locking the knife switch closing circuit;

[0025] 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 knife switch closing circuit is disconnected through the first relay power detection structure to lock the knife switch closing circuit;

[0026] The second relay power detection 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 detection structure is used to disconnect the knife switch closing circuit to lock the knife switch closing circuit.

[0027] In addition, an embodiment of the present application further provides an AC power test lockout status prompting method, which is applied to the above-mentioned AC power test lockout device. The AC power test lockout status prompting method includes the following steps:

[0028] A first voltage is collected from the first output circuit through the first electrical detection and collection channel, and a second voltage is collected from the third output circuit through the second electrical detection and collection channel, so that when a collection result of at least one of the first voltage collection and the second voltage collection is not zero, the second output contact is controlled to open and close, connect the first indicator light control circuit, and light up the first indicator light;

[0029] 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;

[0030] 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.

[0031] In addition, an embodiment of the present application further provides an AC power test lockout status prompting method, which is applied to the above-mentioned AC power test lockout device. The AC power test lockout status prompting method includes the following steps:

[0032] Acquire a first voltage from the first output circuit through the first electrical detection acquisition channel to obtain a first voltage;

[0033] Acquire a second voltage from the third output circuit through the second electrical detection acquisition channel to obtain a second voltage;

[0034] 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.

[0035] In addition, an embodiment of the present application further provides an AC power test lockout status prompting method, which is applied to the above-mentioned AC power test lockout device. The AC power test lockout status prompting method includes the following steps:

[0036] monitoring a circuit breaker trip 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 trip signal is detected by the first signal monitoring channel, the third output contact is controlled to open and close, connect the second indicator light control circuit, and light up the second indicator light;

[0037] 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.

[0038] 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 (i.e., 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, it can perform a first electrical detection on the other output circuit of the first voltage transformer through the first relay electrical test structure to realize the relay hard electrical test electrical test locking operation on the corresponding knife switch closing circuit; on the other hand, it can perform a second electrical detection on the other output circuit of the second voltage transformer through the second relay electrical test structure to realize the relay hard electrical test electrical test locking operation on the corresponding knife switch closing circuit. In this way, regardless of whether any output circuit of either voltage transformer (the first voltage transformer or the second voltage transformer) fails, or the voltage test lock controller itself fails or is abnormal, the AC voltage test lock device can use other unfaulted voltage test circuits to implement the voltage test lock operation on the corresponding knife switch closing circuit, thereby ensuring that the AC voltage test lock device has a reliable voltage test lock function. This shows that this technical solution can effectively improve the technical problem of low voltage test reliability and significant safety risks in existing AC voltage test lock devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a partial schematic diagram of the principle of the AC electric test locking device in the embodiment of the present application;

[0040] 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;

[0041] Figure 3 for Figure 1 The schematic diagram of the principle of the electroscope power supply coil circuit of the AC electroscope locking device shown;

[0042] Figure 4 for Figure 1 The schematic diagram of the first indicator light control circuit of the AC electric test locking device shown;

[0043] Figure 5 for Figure 1 The schematic diagram of the principle of fault state detection of the AC electric test locking device shown;

[0044] Figure 6 for Figure 1 The schematic diagram of the principle of circuit breaker signal acquisition of the AC electric test locking device shown;

[0045] Figure 7 for Figure 1 The schematic diagram of the fault alarm logic principle of the AC electric test locking device shown;

[0046] Figure 8 This is a flowchart of the AC electrical detection locking method in an embodiment of the present application;

[0047] Figure 9 This is a first flow chart of the AC power test lockout status prompt method in an embodiment of the present application;

[0048] Figure 10 This is a second flow chart of the AC power test lockout status prompt method in an embodiment of the present application;

[0049] Figure 11 This is a third flow chart of the AC power test lockout status prompt method in the embodiment of this application.

[0050] Description of Figure Numbers:

[0051] 100. AC electrical 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

[0052] The terms "first," "second," "third," "fourth," and so forth (if any) in the specification and claims of this application and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments described herein can be implemented in an order other than that shown 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 apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.

[0053] In one embodiment, Figure 1 and Figure 2 As shown, an embodiment of the present application provides an AC current test locking device 100. The AC current test locking device 100 may specifically include a first voltage transformer VT1, a second voltage transformer VT2, a current test locking controller 1n, and a switch closing circuit 140 for controlling the closing operation of the electric grounding switch M in the overhead contact circuit 200. The current test locking controller 1n is provided with a first current test acquisition channel, a second current test acquisition channel, and a first output contact DO4 for outputting the controller's current test results. The first voltage transformer VT1 is provided with a first input circuit 111 connected to the overhead contact circuit 200, a first output circuit 112 connected to the first current test acquisition channel, and a second output circuit 113 having a first relay current test structure. The second voltage transformer VT2 is provided with a second input circuit 121 connected to the overhead contact circuit 200, a third output circuit 122 connected to the second current test acquisition channel, and a fourth output circuit 123 having a second relay current test structure. The first relay power detection structure, the second relay power detection structure and the first output contact DO4 are all connected to the knife switch closing circuit 140 to realize the power detection lock of the relay hard power detection and the controller soft power detection.

[0054] It can be understood that the AC electrical test locking device 100 of the embodiment of the present application is mainly used in the electrical test operation of AC circuits such as the contact network of a 27.5kV electrified railway, and when it is applied to the contact network circuit 200 of an electrified railway, it can perform electrical 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 there is electricity in the contact network circuit 200, 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.

[0055] Generally speaking, the voltage transformers mentioned above (the first voltage transformer VT1 or the second voltage transformer VT2) are bipolar voltage transformers, which are connected to the overhead line circuit 200 via a primary coil circuit. The voltage is then stepped down to two 100V low voltage circuits through the internal coil mutual inductance. This means that two 100V low voltage circuits 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 one secondary coil circuit of the first voltage transformer VT1, and the second output circuit 113 mentioned above specifically refers to the other 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 one secondary coil circuit of the second voltage transformer VT2, and the fourth output circuit 123 specifically refers to the other secondary coil circuit of the second voltage transformer VT2.

[0056] Generally speaking, the overhead contact network circuit 200 of an electrified railway may include an overhead contact network terminal T, a grounding terminal PE (specifically, a steel rail or an overhead ground wire), and an electric grounding switch M. The overhead contact network terminal T and the grounding terminal PE are electrically connected via the electric grounding switch M. That is, the overhead contact network terminal T and the grounding terminal PE are electrically disconnected or connected by the opening and closing operations of the electric grounding switch M. Therefore, the aforementioned first input circuit 111 specifically refers to one external contact 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 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 aforementioned second input circuit 121 connected to the overhead contact network circuit 200 specifically refers to one external contact 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 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 circuit 111 and the second input circuit 121 are respectively connected to the contact network circuit 200, an external contact A of the primary coil circuit of the first voltage transformer VT1 and an external contact A of the primary coil circuit of the second voltage transformer VT2 are respectively connected to the contact network terminal T of the contact network circuit 200 through different branches, and another external contact B of the primary coil circuit of the first voltage transformer VT1 and another external contact B of the primary coil circuit of the second voltage transformer VT2 are respectively connected to the grounding terminal PE of the contact network circuit 200 through different branches.

[0057] Generally speaking, the aforementioned first voltage test acquisition channel specifically refers to the voltage test acquisition channel formed by the first voltage acquisition terminal 2X1 and the common voltage acquisition terminal 2X4 of the voltage test lockout controller 1n, while the aforementioned second voltage test acquisition channel specifically refers to the voltage test acquisition channel formed by the second voltage acquisition terminal 2X2 and the common voltage acquisition terminal 2X4 of the voltage test lockout controller 1n. In addition, the voltage test lockout controller 1n also has a backup voltage acquisition terminal 2X3. Therefore, the aforementioned connection of the first output circuit 112 to the first voltage test acquisition channel specifically refers to connecting an external contact 1a of a secondary coil loop of the first voltage transformer VT1 to the first voltage acquisition terminal 2X1, and connecting another external contact 1b of a secondary coil loop of the first voltage transformer VT1 to the common voltage acquisition terminal 2X4. To enable the first voltage test acquisition channel to better acquire the voltage in the first output circuit 112, at least one sampling resistor is connected in series between the external contact 1a and the first voltage acquisition terminal 2X1. Similarly, the aforementioned connection of the third output circuit 122 to the second voltage detection and acquisition channel specifically refers to connecting an external contact 1a of a secondary coil circuit of the second voltage transformer VT2 to the second voltage acquisition terminal 2X2, and connecting another external contact 1b of a secondary coil circuit of the second voltage transformer VT2 to the common voltage acquisition terminal 2X4. To enable the second voltage detection and acquisition channel to better acquire the voltage in the third output circuit 122, at least one sampling resistor is connected in series between the external contact 1a and the second voltage acquisition terminal 2X2. Preferably, the aforementioned sampling resistors can be integrated into a single resistor VR. The first output contact DO4 mentioned above is used to output the controller's power test result, which specifically refers to the first output contact DO4 remaining in the normally open state in the knife switch closing circuit 140. When the power test locking controller 1n detects that the contact network circuit 200 has power through any power test acquisition channel (the first power test acquisition channel or the second power test acquisition channel), the first output contact DO4 does not open and remains in the normally open state to achieve the power test locking of the knife switch closing circuit 140. When the power test locking controller 1n detects that the contact network circuit 200 has no power through all power test acquisition channels (the first power test acquisition channel and the second power test acquisition channel), the first output contact DO4 opens and closes, releasing the power test locking state of the knife switch closing circuit 140.

[0058] 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 lock 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 to make the knife switch closing circuit 140 unable to control the electric grounding knife switch M to perform the closing operation, thereby realizing the power testing lock of the relay hard power testing respectively. When the first open-circuit contact DO4 detects that there is electricity in the contact network circuit 200 in the corresponding test circuit, 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 test of the test lock controller of the relay hard test, that is, the first relay test structure, the second relay test structure and the first open-circuit contact DO4 are independent of each other in the test lock of the knife switch closing circuit 140 and do not affect each other.

[0059] Specifically, for the test circuit of the test locking controller 1n, it is different from the traditional method of only collecting two test channels (i.e., two output circuits) of a voltage transformer, but collects one of the test 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 test 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 test locking controller 1n will determine that there is power in the contact network circuit 200. At this time, the test locking controller 1n controls the first output 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. Unlike the soft test circuit of the test lock controller 1n, the test circuits of the first relay test structure and the second relay test structure both employ hard and soft test methods. The first relay test structure typically includes at least one relay, whose normally closed contacts are connected to the knife switch closing circuit 140. At this point, the relay's power supply coil circuit can be directly or indirectly connected to the second output circuit 113. This allows the relay's power supply coil circuit to open the normally closed contacts of the relay when the contact network circuit 200 is energized, thereby energizing the second output circuit 113 and achieving test lockout of the knife switch closing circuit 140. Similarly, the second relay electrical 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 and the fourth output circuit 123 is energized, the power supply coil circuit of the relay is energized to disconnect the normally closed contacts of the relay, thereby realizing the electrical testing lock of the knife switch closing circuit 140.

[0060] In this way, the AC electrical test locking device 100 of the embodiment of the present application can form an electrical test redundant design through the above-mentioned structural setting, that is, the AC electrical test locking device 100 can, on the one hand, respectively collect one of the output circuits of two different voltage transformers (that is, the first voltage transformer VT1 and the second voltage transformer VT2) through the electrical test locking controller 1n to realize the electrical test locking operation of the corresponding knife switch closing circuit 140; on the other hand, it can perform a first power detection on the other output circuit of the first voltage transformer VT1 through the first relay electrical test structure to realize the controller soft electrical test and electrical test locking operation of the corresponding knife switch closing circuit 140; on the other hand, it can perform a second power detection on the other output circuit of the second voltage transformer VT2 through the second relay electrical test structure to realize the relay hard electrical test and electrical test locking operation of the corresponding knife switch closing circuit 140. In this way, no matter whether 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 realize 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.

[0061] In some examples, such as Figure 1 As shown, the AC electrical test locking device 100 further includes a first circuit breaker QF1, a second circuit breaker QF2, a third circuit breaker QF3, and a fourth circuit breaker QF4. The first circuit breaker QF1 is disposed in the first output circuit 112 to protect the branch circuit in which the first output circuit 112 is located. The second circuit breaker QF2 is disposed in the second output circuit 113 to protect the branch circuit in which the second output circuit 113 is located. The third circuit breaker QF3 is disposed in the third output circuit 122 to protect the branch circuit in which the third output circuit 122 is located. The fourth circuit breaker QF4 is disposed in the fourth output circuit 123 to protect the branch circuit in which the fourth output circuit 123 is located. In this way, through the above-mentioned structural arrangement, when a fault occurs in any of the first output circuit 112, the second output circuit 113, the third output circuit 122 and the fourth output circuit 123, 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) trips to isolate the secondary components at the rear end from the primary part at the front end, thereby ensuring that the secondary components 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 by overcurrent or leakage.

[0062] 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 with 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 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 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 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 FIG 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, to disconnect the normally closed contact of the third relay KA3, to disconnect the control circuit 141, and finally realize the relay hard test and electrical testing lock 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, to disconnect the normally closed contact of the fourth relay KA4, to disconnect the power circuit 142, and finally realize the relay hard test and electrical testing lock of the knife switch closing circuit 140. With respect to the test circuit of the test lock controller 1n, when the overhead line circuit 200 is energized, the first output circuit 112 and the third output circuit 122 are energized. Consequently, when the test lock controller 1n detects that at least one of the first output circuit 112 and the third output circuit 122 is energized, it controls the first output contact DO4 to remain closed, thereby maintaining the disconnection state of the first output contact DO4 with respect to the control circuit 141, ultimately achieving a test lock for the controller's soft test of the switch closing circuit 140. Furthermore, with the above-described structural arrangement, when one of the voltage transformers (the first voltage transformer VT1 or the second voltage transformer VT2) fails, the test operation performed on the other voltage transformer (the second voltage transformer VT2 or the first voltage transformer VT1) can also achieve a test lock for the switch closing circuit 140, thereby preventing erroneous operation.

[0063] It will be understood that in this example, both the third relay KA3 and the fourth relay KA4 are powered by AC power. Specifically, the power supply coil circuits of the third relay KA3 and the fourth relay KA4 are connected to the AC power input and output terminals, respectively. In this example, the control circuit 141 also includes a remote control switch QK REMOTE and a local switch QK LOCAL, which are connected in parallel within the control circuit 141 to enable both remote and local operation of the control circuit 141. Furthermore, the control circuit 141 also includes other output contacts (DO1 and DO3) of the voltage test and locking controller 1n and a travel switch S1. Output contact DO1 is a remote closing output contact, connected in series with the branch containing the remote control switch QK REMOTE and maintained in a normally open state, enabling remote operation of the control circuit 141 in conjunction with the remote control switch QK REMOTE. The opening contact DO3 is a closing condition-permitted opening contact, which is kept in a normally open state and opens and closes when the electric test locking controller 1n verifies that the closing condition is permitted, thereby realizing 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 When the contactor K1E is energized, the contactor K1E is connected in series with the two sets of normally open contacts (i.e. Figure 2 As shown in FIG, contacts 1 and 2 of K1E, contacts 3 and 4 of K1E can be closed to connect the power circuit 142.

[0064] 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 output contact DO8 for outputting the controller power test result. The second open output 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) and the normally open contact of the fourth relay KA4 (ie Figure 4Contacts 12 and 8 of KA4 shown in the figure are all 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 energized, the first output circuit 112 and the third output circuit 122 will be energized, 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 energized, it controls the second open contact DO8 to open and close to light up the first indicator light HD to indicate that the contact network circuit 200 is energized.

[0065] It will be understood that the first indicator light HD in this example can be used specifically as a contact line power indicator light, that is, when it is illuminated, it indicates that the contact line circuit 200 has power. In this example, the second output contact DO8 is used to output the controller's power test result. Specifically, the second output contact DO8 remains normally open in the first indicator light control circuit 150. When the power test lockout controller 1n verifies that the contact line circuit 200 has power through any power test acquisition channel (the first power test acquisition channel or the second power test acquisition channel), the second output contact DO8 opens and closes, illuminating the first indicator light HD to indicate that the contact line circuit 200 has power. If the power test lockout controller 1n verifies that the contact line circuit 200 has power through all power test acquisition channels (the first power test acquisition channel and the second power test acquisition channel), the second output contact DO8 remains open, preventing the corresponding branch from illuminating the first indicator light HD.

[0066] In some examples, such as Figure 1 、 Figure 3 and Figure 4 As shown, the AC electrical test locking device 100 also includes a first self-reset normally open button (i.e. Figure 3Button SA shown in the figure), the first self-reset normally open button (i.e. Figure 3 Contacts 23 and 24 of the button SA shown in the figure are connected to the power supply coil circuits of the third relay KA3 and the fourth relay KA4, respectively. With this structural arrangement, when the first self-reset normally open button is pressed, the power supply coil circuits of the third relay KA3 and the fourth relay KA4 are connected. At this point, the coils of the third relay KA3 and the fourth relay KA4 are energized, closing the normally open contacts of the third relay KA3 and the fourth relay KA4, respectively, causing the first indicator light HD to illuminate. If illuminated, it indicates that the wiring of the first indicator light HD and its electrical circuit is normal; otherwise, it is abnormal. This functional design allows equipment maintenance personnel to perform regular, real-time self-checks to ensure that the first indicator light HD is in normal working condition.

[0067] In some examples, such as Figure 1 、 Figure 3 and Figure 5 As shown, the AC voltage-testing locking device 100 also includes a second indicator light control circuit 160 for controlling the operation of the second indicator light SD. The voltage-testing locking controller 1n is also provided with a third output contact DO11 for outputting the controller's fault detection results. This third output contact DO11 is connected to the second indicator light control circuit 160. This structural arrangement enables the AC voltage-testing locking device 100 to also provide fault self-detection. Because the AC voltage-testing locking device 100 utilizes two voltage transformers (i.e., a first voltage transformer VT1 and a second voltage transformer VT2), the two voltage-testing channels of the voltage-testing locking controller 1n collect voltages from the two voltage transformers. Therefore, the voltage-testing locking controller 1n compares the voltages collected from the two voltage transformers. If the voltage difference between the two voltage transformers exceeds a set threshold, the controller 1n opens and closes the third output contact DO11, energizing the second indicator light control circuit 160 and illuminating the second indicator light SD, thereby implementing fault self-detection. Furthermore, the electric test locking controller 1n can also comprehensively determine which voltage transformer is faulty based on the voltage values ​​collected from the two voltage transformers.

[0068] It is understandable that the second indicator light SD in this example can be used specifically as a fault indicator light, that is, when it is lit, there is a fault in the AC test and 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 in a normally open state in the second indicator light control circuit 160. When the test and locking controller 1n detects that the AC test and locking device 100 has a fault, the third output contact DO11 opens and closes to illuminate the second indicator light SD, indicating that the AC test and locking device 100 has a fault. When the test and locking controller 1n does not detect that the AC test and locking device 100 has a fault, the third output contact DO11 does not open and remains in a normally open state, which means that the corresponding branch circuit cannot illuminate the second indicator light SD.

[0069] In some examples, such as Figure 1 、 Figure 3 and Figure 5 As shown, the AC electrical test locking device 100 also includes a second self-reset normally open button (i.e. Figure 5 The button SA with contacts 13 and 14 is shown in FIG), the second self-resetting normally open button (ie Figure 5 Contacts 13 and 14 of the button SA shown in FIG. 1 are connected to the second indicator light control circuit 160. Furthermore, the second self-reset normally open button and the third output contact DO11 are arranged in parallel within the second indicator light control circuit 160. With this configuration, pressing the second self-reset normally open button connects the second indicator light control circuit 160, illuminating the second indicator light SD. If illuminated, this indicates that the second indicator light SD and its electrical circuit wiring are functioning properly. Otherwise, this indicates an abnormality. This functional design allows equipment maintenance personnel to perform regular, real-time self-checks to ensure that the second indicator light SD is functioning properly.

[0070] 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 the 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 the button SA (i.e., contacts 23 and 24) is used as the first self-reset normally open button mentioned above.

[0071] In some examples, such as Figure 1 、 Figure 3 and Figure 5 As shown, the AC electric test locking device 100 further includes a self-resetting normally closed button RESET and a fifth relay KA5, 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 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 power supply coil circuit of the fifth relay KA5 is also connected to a third output contact DO11. 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 As shown in FIG, contacts 12 and 8 of KA5 are connected to the second indicator light control circuit 160, and the second set of normally open contacts and the second self-reset normally open button of the fifth relay KA5 are arranged in parallel within the second indicator light control circuit 160. This structural arrangement effectively enables indirect connection of the third output contact DO11 to the second indicator light control circuit 160. In this case, when a fault occurs in the electrical test lockout controller 1n, it controls the third output contact DO11 as a fault output, closing the third output contact DO11 to connect the power supply coil circuit of the fifth relay KA5. This energizes the fifth relay KA5 and closes its two sets of normally open contacts (i.e., the first set of normally open contacts and the second set of normally open contacts). In the power supply coil circuit of the fifth relay KA5, due to the closure of the first set of normally open contacts of the fifth relay KA5, the power supply coil circuit of the fifth relay KA5 remains energized, maintaining a self-holding state (hence, the power supply coil circuit of the fifth relay KA5 is also called the self-holding circuit of the device). At the same time, the second set of normally open contacts of the fifth relay KA5 closes, connecting the second indicator light control circuit 160 and causing the second indicator light SD to remain permanently illuminated. If equipment maintenance personnel discover the second indicator light SD is illuminated during inspection, they must perform equipment maintenance. For example, after resolving a fault in the voltage test lockout controller 1n, the third open contact DO11 opens and retracts. Due to the self-holding function of the fifth relay KA5, the second indicator light SD remains permanently illuminated. At this point, the maintenance personnel presses the self-resetting normally closed button RESET, disconnecting the power supply coil circuit of the fifth relay KA5 and extinguishing the second indicator light SD, restoring the equipment to normal operation. This function allows maintenance personnel to promptly detect and resolve equipment faults. The purpose of manually resetting the second indicator light SD is to force maintenance personnel to visit the site for on-site verification of the fault resolution. Once confirmed, they manually press the self-resetting normally closed button RESET to extinguish the second indicator light SD.

[0072] 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 FIG constitute a signal monitoring channel) and a second signal monitoring channel (ie 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 auxiliary contacts of the second circuit breaker QF2 (i.e. Figure 6 At least one of the contacts 11 and 14 of QF2 shown in FIG 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) and the auxiliary contacts of the fourth space switch QF4 (ie Figure 6 At least one of the contacts 11 and 14 of QF4 (shown in FIG) is connected to the second signal monitoring channel. Thus, with this structural arrangement, when an abnormality occurs in either voltage transformer (first voltage transformer VT1 or second voltage transformer VT2), causing the circuit breaker in its output circuit to trip, its voltage test lock controller 1n will detect the tripping position change signal of the corresponding circuit breaker through the corresponding signal monitoring channel (first signal monitoring channel or second signal monitoring channel), control the third output contact DO11 to open, connect the second indicator light control circuit 160, and illuminate the second indicator light SD. This enables fault self-detection for both voltage transformers (first voltage transformer VT1 and second voltage transformer VT2).

[0073] It is understood that, in addition to the auxiliary contacts, the first circuit breaker QF1 in this example also has a main contact (not shown) 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) connected to the second output circuit 113 and the power supply coil circuit of the third relay KA3. Figure 3 or Figure 5 In this example, the third circuit breaker QF3 has not only auxiliary contacts but also main contacts (not shown) connected to the third output circuit 122. In this example, the fourth circuit breaker QF4 has not only auxiliary contacts but also main contacts (i.e., Figure 3 or Figure 5 21 and 24 of QF4 shown in FIG).

[0074] In addition, the AC test and lock device 100 has many functions, and the status monitoring of these functions must be achieved through the test and lock controller 1n. If the function cannot meet the original set parameters, or the function has an abnormal state, it needs to be input to the test and lock controller 1n in a remote signaling manner, and the test and lock controller 1n will control the third output contact DO11 to open and close. Controlling the third output contact DO11 to open and close serves as the alarm output of the test and lock 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:

[0075] 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 locking controller 1n. If a tripping position change occurs, the voltage test locking controller 1n will execute the DO11 opening and closing and light up the second indicator light SD. The same principle applies to the following.

[0076] 2. Operation power supply monitoring: monitor the circuit breaker of the grounding knife switch motor circuit. If an abnormality occurs in the motor circuit and the knife switch circuit breaker trips, the power test locking controller 1n will execute DO11 opening and closing.

[0077] 3. Parameter verification error: In order to ensure the accuracy of the parameters set in the power test lock controller 1n, the parameters need to be verified. If the verification is wrong, the power test lock controller 1n will execute DO11 opening and closing.

[0078] 4. Heating circuit disconnection: There is a heating detection component in the electric heater circuit inside the grounding device. If it is detected that the electric heater circuit is disconnected, the electrical detection locking controller 1n will execute DO11 opening and closing.

[0079] 5. Heating timeout: If the electric heating time exceeds the set time, the electric test locking controller 1n will execute DO11 opening and closing.

[0080] 6. Temperature and humidity sensor communication failure: If the RS485 communication between the temperature and humidity sensor and the test and lock controller 1n fails, the test and lock controller 1n will execute DO11 opening and closing.

[0081] 7. The voltage difference between the two networks is greater than 0.1Un: When the voltage difference between VT1 and VT2 detected by the power test locking controller 1n exceeds 0.1Un or the set threshold, the power test locking controller 1n will execute DO11 opening and closing.

[0082] 8. The grounding switch position is neither open nor closed: When the grounding switch position state is in an abnormal position neither open nor closed, the voltage test locking controller 1n will execute DO11 to open and close.

[0083] 9. Motor quick disconnect: There is a current detection element in the motor's power circuit. 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 disconnect operation. At this time, the electrical test locking controller 1n will execute DO11 opening and closing.

[0084] 10. Motor overcurrent: There is a current detection element in the motor's power circuit. 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 opening and closing.

[0085] 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.

[0086] 12. Communication interruption between the controller and external devices: When the communication between the test and locking controller 1n and external devices (such as LED display screen, electronic signboard, ground indicator light, etc.) is interrupted, the test and locking controller 1n will execute DO11 opening and closing.

[0087] In one embodiment, Figure 8 As shown, the embodiment of the present application further provides an AC electrical test locking method, which is applied to the AC electrical test locking device 100 of the above embodiment. The AC electrical test locking method may specifically include the following steps:

[0088] 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 open, so as to maintain the disconnected state of the knife switch closing circuit and lock the knife switch closing circuit.

[0089] It is understandable that if Figures 1 to 3As shown, for the test circuit of the test locking controller 1n, it is different from the traditional method of only collecting two test channels (i.e., two output circuits) of a voltage transformer. It collects one of the test 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 test 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 test locking controller 1n will determine that there is power in the contact network circuit 200. At this time, the test locking controller 1n controls the first output 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.

[0090] 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.

[0091] It is understandable that if Figures 1 to 3 As shown, the first relay power detection 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 connected to the second output circuit 113 directly or indirectly. 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 contact of the relay, thereby realizing the power detection lock of the knife switch closing circuit 140.

[0092] 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.

[0093] 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 contact of the relay is 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 contact of the relay, thereby realizing the power testing lock of the knife switch closing circuit 140.

[0094] In this way, the AC electrical test method of the embodiment of the present application can form an electrical test redundancy design through the above-mentioned method steps, that is, no matter whether 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, its AC electrical test locking device 100 can realize 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 its AC electrical test locking method has a reliable electrical test locking function.

[0095] In one embodiment, Figure 9 As shown, the embodiment of the present application further provides an AC power test lockout status prompting method, which is applied to the AC power test lockout device 100 of the above embodiment. The AC power test lockout status prompting method includes the following steps:

[0096] Step S210: Perform a first voltage acquisition on the first output circuit through the first electrical detection acquisition channel, and perform a second voltage acquisition on the third output circuit 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.

[0097] 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 energized, the first output circuit 112 and the third output circuit 122 will be energized, and then the first test acquisition channel and the second test acquisition 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 energized, 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 energized.

[0098] 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.

[0099] It is understandable that if Figure 1 、 Figure 3 and Figure 4As shown, the first relay power detection 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 connected to the second output circuit 113 directly or indirectly. 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.

[0100] Step S230: performing 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.

[0101] It is understandable that if Figure 1 、 Figure 3 and Figure 4 As shown, the second relay power detection 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 there is power in the contact network circuit 200.

[0102] In this way, the AC electrical test lockout status indication method of the embodiment of the present application can form an electrical test redundancy design through the above-mentioned method steps, that is, no matter whether any output circuit of any voltage transformer (the first voltage transformer VT1 or the second voltage transformer VT2) fails, or the electrical test lockout controller 1n itself fails or is abnormal, its AC electrical test lockout device 100 can realize the electrical test operation of the contact network circuit 200 through other electrical test circuits that have not failed, ensure the accurate electrical 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.

[0103] In one embodiment, Figure 10 As shown, the embodiment of the present application further provides an AC power test lockout status prompting method, which is applied to the AC power test lockout device 100 of the above embodiment. The AC power test lockout status prompting method includes the following steps:

[0104] Step S310: collecting a first voltage from a first output circuit through a first electrical detection and collection channel to obtain a first voltage.

[0105] Step S320: collecting a second voltage on the third output circuit through the second electrical detection and collection channel to obtain a second voltage.

[0106] 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 / close and connect the second indicator light control circuit to light up the second indicator light.

[0107] It is understandable that if Figure 1 、 Figure 3 and Figure 5 As shown, since the AC voltage test and locking device 100 utilizes two voltage transformers (i.e., a first voltage transformer VT1 and a second voltage transformer VT2), the two voltage test channels of the voltage test and locking controller 1n collect the voltages of the two voltage transformers (i.e., the first voltage collected via the first output circuit 112 of the first voltage transformer VT1 and the second voltage collected via the third output circuit 122 of the second voltage transformer VT2). Therefore, the voltage test and locking controller 1n compares the collected voltage results of the two voltage transformers. When the voltage difference between the two voltage transformers (i.e., the voltage difference between the first and second voltages) exceeds a preset threshold, the controller controls the third output contact DO11 to open and close, connecting the second indicator light control circuit 160 and illuminating the second indicator light SD, thereby implementing fault self-detection. Furthermore, the voltage test and 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 collected voltage values ​​of the two voltage transformers (i.e., the first and second voltages).

[0108] In this way, the AC electrical test locking status indication method of the embodiment of the present application can, through the above-mentioned method steps, 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 electrical test locking device 100.

[0109] In one embodiment, Figure 11 As shown, the embodiment of the present application further provides an AC power test lockout status prompting method, which is applied to the AC power test lockout device 100 of the above embodiment. The AC power test lockout status prompting method includes the following steps:

[0110] 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 open and close to connect the second indicator light control circuit and light up the second indicator light.

[0111] 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 electrical 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, and light up the second indicator light SD.

[0112] 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 open and close to connect the second indicator light control circuit and light up the second indicator light.

[0113] 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 electrical 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, and the second indicator light SD can be lit.

[0114] In this way, the AC 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 fault status indication can be made in time through the second indicator light SD.

[0115] The above embodiments are intended only to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. However, such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of this application.

Claims

1. An AC electrical test locking device, characterized in that: It includes a first voltage transformer, a second voltage transformer, an electric test locking controller and a knife switch closing circuit for controlling the electric grounding knife switch in the contact network circuit to perform a closing operation. The electric test locking controller is provided with a first electric test acquisition channel, a second electric test acquisition 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 contact network circuit, a first output circuit connected to the first power detection acquisition 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 contact network circuit, a third output circuit connected to the second power detection acquisition channel, and a fourth output circuit having a second relay power detection structure; The first relay power detection structure, the second relay power detection structure and the first output contact are all connected to the knife switch closing circuit to realize the power detection lock of the relay hard power detection and the controller soft power detection; the knife switch closing circuit includes a control circuit for controlling the motor action and a power circuit for executing the motor action; The first relay power detection 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.

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

3. The AC electrical test locking device according to claim 1, 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.

4. The AC electrical test locking device according to claim 3, characterized in that: It also includes a first self-reset normally open button, which is respectively connected to the power supply coil circuit of the third relay and the power supply coil circuit of the fourth relay.

5. The AC electrical 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.

6. The AC electrical test locking device according to claim 5, characterized in that: It also includes a second self-reset normally open button, which 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.

7. The AC electrical test locking device according to claim 6, characterized in that: The device further comprises a self-reset normally closed button and a fifth relay, 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-reset normally open button are arranged in parallel in the second indicator light control circuit.

8. The AC electrical test locking device according to claim 5, 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.

9. An AC electrical test locking method, characterized in that: Applied to the AC electrical test locking device according to any one of claims 1 to 8, the AC electrical test locking method comprises the following steps: Performing a first voltage acquisition on the first output circuit through the first electrical detection acquisition channel, and performing a second voltage acquisition on the third output circuit through the second electrical detection acquisition channel, so that when a collection 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, thereby maintaining the disconnected state of the knife switch closing circuit, thereby locking the knife switch closing circuit; 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 knife switch closing circuit is disconnected through the first relay power detection structure to lock the knife switch closing circuit; The second relay power detection 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 detection structure is used to disconnect the knife switch closing circuit to lock the knife switch closing circuit.

10. A method for prompting an AC power test lockout state, characterized in that: Applied to the AC electrical test locking device according to claim 3 or 4, the AC electrical test locking state prompting method comprises the following steps: A first voltage is collected from the first output circuit through the first electrical detection and collection channel, and a second voltage is collected from the third output circuit through the second electrical detection and collection channel, so that when a collection result of at least one of the first voltage collection and the second voltage collection 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; 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; 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.

11. A method for prompting an AC power test lockout state, characterized in that: Applied to the AC electrical test locking device according to any one of claims 5 to 8, the AC electrical test locking state prompting method comprises the following steps: Acquire a first voltage from the first output circuit through the first electrical detection acquisition channel to obtain a first voltage; Acquire a second voltage from the third output circuit through the second electrical detection acquisition 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.

12. A method for prompting an AC power test lockout state, characterized in that: Applied to the AC electrical test locking device according to claim 8, the AC electrical test locking status prompting method comprises the following steps: monitoring a circuit breaker trip 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 trip signal is detected by the first signal monitoring channel, the third output contact is controlled to open and close, connect the second indicator light control circuit, and 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.

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