Automatic test device and method for automatic switching of backup circuit based on dynamic switching of electrical circuit

Abstract

The present invention discloses an automatic test device for standby automatic switching based on dynamic switching of electrical circuits, including a voltage input module, a circuit breaker module, a bus voltage output module, and a circuit switching module, and also discloses an automatic test method for standby automatic switching based on dynamic switching of electrical circuits. The circuit breaker position is simulated by the circuit breaker module, and the automatic switching of the bus voltage state is realized by the circuit switching module, thereby realizing automatic testing of the standby automatic switching device. The accuracy and test efficiency of the standby automatic switching test are improved, which is of great significance to the safe and reliable operation of the standby automatic switching device.

Description

Technical Field

[0001] The invention relates to the technical field of transformer substation operation and maintenance, in particular to an automatic test device for standby automatic switching based on dynamic switching of electrical circuits, and also to an automatic test method for standby automatic switching based on dynamic switching of electrical circuits. Background Art

[0002] The automatic switching device of the backup power supply is mostly used to automatically and quickly switch on the backup power supply after the working power supply trips due to a fault. At present, the test of the automatic switching of the backup power supply in conventional substations is mostly done by manually controlling the changes of the switch quantity and the analog quantity, with a low level of automation and low test efficiency; and when the main wiring of the substation is complex, the test of the automatic switching logic is more prone to errors. During the test, it is often necessary to simulate multiple circuit breaker action states and analog quantity states at the same time. At present, there is a lack of test devices that can realize the automatic switching of the circuit breaker state and the analog quantity state during the test. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the current prior art, the present invention provides an automatic test device for standby automatic switching based on dynamic switching of electrical circuits, and also provides an automatic test method for standby automatic switching based on dynamic switching of electrical circuits.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The automatic test device for standby automatic switching based on dynamic switching of electrical circuits includes a voltage input module, a circuit breaker module, a circuit switching module and a bus voltage output module.

[0006] The voltage input module is used to access the AC voltage signal output by the power source, generate the bus voltage and multiple groups of incoming line voltages, and output the bus voltage and multiple groups of incoming line voltages to the loop switching module.

[0007] The circuit breaker module is used to receive the tripping and closing signals of the standby automatic transfer device. The tripping and closing signals include tripping and closing. The circuit breaker position signals are output to the standby automatic transfer device and the circuit switching module. The circuit breaker position signals include tripping and closing. The circuit breaker module receives the incoming line voltage from the circuit switching module and outputs the incoming line voltage to the standby automatic transfer device.

[0008] A loop switching module is used to control the on / off of the bus voltage and different bus voltage output modules according to the circuit breaker position signal input by the circuit breaker module, and each bus voltage output module is connected to the corresponding bus;

[0009] The busbar connection circuit breaker selection switch included in the loop switching module is used to switch the connection relationship between the circuit breaker module and the busbar.

[0010] When the tripping and closing signal state of the circuit breaker module connected to the backup automatic re-entry device is in the tripping opening action or the manual opening and closing switch of the circuit breaker module is in the manual opening state, the relay opened in the tripping position of the circuit breaker module remains in the closed state, and the relay opened in the closing position remains in the open state;

[0011] When the tripping and closing signal state of the circuit breaker module connected to the backup automatic re-entry device is in the closing action or the manual opening and closing switch of the circuit breaker module is in the manual closing state, the relay opened in the tripping position of the circuit breaker module remains in the open state, and the relay opened in the closing position remains in the closed state;

[0012] When the tripping and closing signals of the backup automatic switching device connected to the circuit breaker module are not actuated or the manual opening and closing switches of the circuit breaker module are in the intermediate state, the tripping and closing relays of the circuit breaker module remain in their original states.

[0013] When the circuit breaker module is connected to both busbars, it is a bus tie circuit breaker; when the circuit breaker module is only connected to one section of busbar, it is an incoming line circuit breaker;

[0014] If the closing position input corresponding to the incoming circuit breaker connected to any section of the bus is in the closed state, the bus voltage is in a pressurized state, or the closing position input corresponding to the bus tie circuit breaker connected to any section of the bus is in the closed state and the opposite bus voltage is in a pressurized state, then the bus voltage is in a pressurized state; otherwise, the bus voltage state is a non-pressurized state. When it is in a pressurized state, the circuit switching module controls the input bus voltage to be connected to the bus voltage output module corresponding to the bus. When it is in a non-pressurized state, the circuit switching module controls the input bus voltage to be disconnected from the bus voltage output module corresponding to the bus.

[0015] The automatic test method of standby automatic switching based on dynamic switching of electrical circuits includes the following steps:

[0016] Step 1: Connect the power source voltage output line to the voltage input module;

[0017] Step 2: Connect the bus voltage of the voltage output module and the incoming line voltage output by the circuit breaker module to the corresponding voltage AC terminals of the standby automatic switching device respectively;

[0018] Step 3: Connect the tripping and closing output circuit of the standby automatic switch to the corresponding circuit breaker module;

[0019] Step 4: Connect the position circuit of the standby automatic circuit breaker to the corresponding circuit breaker module;

[0020] Step 5: Set the busbar connection circuit breaker selection switch state of the loop switching module according to the main wiring situation of the substation;

[0021] Step 6: Start the backup automatic switching logic by controlling the manual opening and closing switch of the circuit breaker module;

[0022] Step 7: According to the tripping and closing signal of the standby automatic switch, the circuit switching module automatically switches and completes the test.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The circuit breaker module is used to simulate the circuit breaker position, and the circuit switching module is used to realize the automatic switching of the bus voltage state, thereby realizing the automatic testing of the standby automatic switching device;

[0025] 2. The present invention improves the accuracy and efficiency of the standby automatic start test, which is of great significance to the safe and reliable operation of the standby automatic start device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The topological structure diagram of the automatic test device based on the dynamic switching of electrical circuits.

[0027] Figure 2 The schematic diagram of the voltage input module structure of the automatic test device based on the dynamic switching of the electrical circuit.

[0028] Figure 3 The schematic diagram of the circuit breaker module structure of the automatic test device for standby automatic switching based on dynamic switching of electrical circuits.

[0029] Figure 4 The schematic diagram of the circuit switching module structure of the automatic test device based on the dynamic switching of the electrical circuit is shown in FIG.

[0030] Figure 5 The schematic diagram of the bus voltage output module structure of the automatic test device for standby automatic switching based on dynamic switching of electrical circuits.

[0031] Figure 6 The figure is a flow chart of the automatic testing method of the standby automatic switching based on the dynamic switching of the electrical circuit. DETAILED DESCRIPTION

[0032] In order to facilitate those skilled in the art to understand and implement the present invention, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the implementation examples described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0033] like Figure 1 As shown, the automatic test device for standby automatic switching based on dynamic switching of electrical circuits includes:

[0034] The voltage input module is used to access the AC voltage signal output by the power source, generate the bus voltage and multiple groups of incoming line voltages, and output the bus voltage and multiple groups of incoming line voltages to the loop switching module.

[0035] like Figure 2As shown, in this embodiment, the input of the voltage input module includes 3 groups of voltages UA, UB, UC and 1 common input UN, and the output of the voltage input module includes 9 groups of voltages U1, U2, U3, U4, U5, U6, UA', UB', UC' and 1 common input UN', which are output to the loop switching module.

[0036] Circuit breaker modules, such as Figure 3 As shown, it is used to simulate the circuit breaker. The circuit breaker module is connected to the tripping and closing signals of the standby automatic transfer device. The tripping and closing signals include tripping and closing. At the same time, the circuit breaker module outputs the circuit breaker position signal to the standby automatic transfer device and the circuit switching module. The circuit breaker position signal includes tripping and closing. The circuit breaker module receives the incoming line voltage from the circuit switching module and outputs the incoming line voltage to the standby automatic transfer device. The circuit breaker module is also switched to disconnect the connection with the bus through the bus connection circuit breaker selection switch of the circuit switching module, or switched to connect to the bus and serve as an incoming line circuit breaker, or switched to connect to the bus as a bus tie circuit breaker.

[0037] The circuit breaker module controls the circuit breaker position signal status by accessing the tripping and closing signals (including tripping and closing) of the backup automatic switching device and the status of the manual opening and closing switches, specifically:

[0038] When the tripping and closing signal state of the circuit breaker module connected to the standby automatic re-throwing device is the tripping opening action or the manual opening and closing switch of the circuit breaker module is in the manual opening state, the relay opened in the tripping position of the circuit breaker module remains in the closed state, and the relay opened in the closing position remains in the open state.

[0039] When the tripping and closing signal state of the circuit breaker module connected to the standby automatic re-throwing device is in the closing action or the manual opening and closing switch of the circuit breaker module is in the manual closing state, the relay opened in the tripping position of the circuit breaker module remains in the open state, and the relay opened in the closing position remains in the closed state.

[0040] When the tripping and closing signals of the circuit breaker module connected to the backup automatic re-throwing device are not actuated or the manual opening and closing switches of the circuit breaker module are in the intermediate state, the tripping and closing relays of the circuit breaker module remain unchanged.

[0041] The voltage on / off switch of the circuit breaker module controls the on / off of the incoming line voltage input from the circuit breaker module to the standby automatic switching device.

[0042] A loop switching module is used to receive the bus voltage and multiple groups of incoming line voltages output by the voltage input module. The loop switching module is used to control the input bus voltage and the on-off of different bus voltage output modules according to the circuit breaker position signal (trip position open and close position open) input by the circuit breaker module. Each bus voltage output module is connected to the corresponding bus;

[0043] The busbar connection circuit breaker selection switch included in the loop switching module is used to switch the connection between the circuit breaker module and the busbar, so that the circuit breaker module is disconnected from the busbar, or the circuit breaker module is connected to the busbar and serves as an incoming circuit breaker, or the circuit breaker module is connected to the busbar as a bus tie circuit breaker.

[0044] like Figure 4 As shown, in this embodiment, the circuit switching module includes connection circuit breaker selection switches corresponding to three busbars, and there are six circuit breaker modules. Each busbar connection circuit breaker selection switch can select the corresponding busbar to be connected to any one or more of the six circuit breaker modules. When a circuit breaker module is connected to both busbars, the circuit breaker module is a bus tie circuit breaker. When a circuit breaker module is only connected to a section of busbar, the circuit breaker module is an incoming line circuit breaker. Other unconnected circuit breakers are irrelevant to the test.

[0045] The loop switching module will use the 9 groups of voltages U1, U2, U3, U4, U5, U6, UA', UB', UC' input by the voltage input module and 6 groups of voltages U1, U2, U3, U4, U5, U6 of the common terminal UN' to output the incoming line voltages 1Ux, 2Ux, 3Ux, 4Ux, 5Ux, 6Ux to the 6 circuit breaker modules. The rest constitute the bus voltages UA', UB', UC'. The loop switching module switches the bus voltage output to the 3 bus voltage output modules according to the circuit breaker position signal (opening in the jump position and closing in the closing position) input by the circuit breaker module, namely:

[0046] Switch the bus voltages UA', UB', UC' to 1UA', 1UB', 1UC' and output them to the corresponding bus voltage output modules;

[0047] Or the bus voltages UA', UB', UC' are switched to 2UA', 2UB', 2UC' and output to the corresponding bus voltage output modules;

[0048] Alternatively, the bus voltages UA', UB', UC' are switched to 3UA', 3UB', 3UC' and output to the corresponding bus voltage output modules.

[0049] The common terminal UN' of the loop switching module input is output in parallel to the incoming line voltage 1Un, the incoming line voltage 2Un, the incoming line voltage 3Un, the incoming line voltage 4Un, the incoming line voltage 5Un, the incoming line voltage 6Un, 1UN', 2UN', and 3UN' of the loop switching module.

[0050] In this embodiment, the circuit switching module receives the circuit breaker position signals (including jump position opening and closing position opening) of the six circuit breaker modules, and respectively receives the six groups of jump position opening and closing position opening of the circuit switching module, including jump position opening 1+, jump position opening 1-, closing position opening 1+, and closing position opening 1- of the first circuit breaker module, jump position opening 2+, jump position opening 2-, closing position opening 2+, and closing position opening 2- of the second circuit breaker module, and jump position opening 2+, jump position opening 2-, closing position opening 2+, and closing position opening 2- of the third circuit breaker module. The circuit breaker module's jump position opening 3+, jump position opening 3-, closed position opening 3+, and closed position opening 3- also include the fourth circuit breaker module's jump position opening 4+, jump position opening 4-, closed position opening 4+, and closed position opening 4-, also include the fifth circuit breaker module's jump position opening 5+, jump position opening 5-, closed position opening 5+, and closed position opening 5-, also include the sixth circuit breaker module's jump position opening 6+, jump position opening 6-, closed position opening 6+, and closed position opening 6-.

[0051] The logic of controlling the on and off of the bus voltage and different bus voltage output modules according to the circuit breaker position signal (trip position open and closed position open) input by the circuit breaker module includes: if the closed position input corresponding to the incoming circuit breaker connected to any section of the bus is in a closed state, then the bus voltage is in a pressurized state; or the closed position input corresponding to the bus tie circuit breaker connected to any section of the bus is in a closed state and the opposite end bus voltage is in a pressurized state, then the bus voltage is in a pressurized state; otherwise, the bus voltage state is a non-pressurized state. When it is in a pressurized state, the circuit switching module controls the input bus voltage to be connected to the bus voltage output module corresponding to the bus, that is, the bus voltage is transmitted to the corresponding bus. When it is in a non-pressurized state, the circuit switching module controls the input bus voltage to be disconnected from the bus voltage output module corresponding to the bus, that is, the bus voltage is disconnected from the bus.

[0052] like Figure 4 As shown, in this embodiment, the busbar includes I busbar, II busbar, and III busbar. If I busbar is connected to circuit breaker module No. 1 and circuit breaker module No. 2, and II busbar is connected to circuit breaker module No. 1 and circuit breaker module No. 3, then circuit breaker module No. 2 and circuit breaker module No. 3 are incoming circuit breaker modules, and circuit breaker module No. 1 is a busbar coupling circuit breaker module. When the closing position of circuit breaker module No. 1 and circuit breaker module No. 2 is opened to a closed state and the closing position of circuit breaker module No. 3 is opened to an open state, I busbar and II busbar are in a pressurized state, and III busbar is in a non-pressurized state. Then 1UA', 1UB', 1UC', 2UA', 2UB', 2UC' will output normal voltage, and 3UA', 3UB', 3UC' will not output voltage.

[0053] The automatic switching logic of the incoming line voltage of the circuit switching module as described above includes that if the corresponding closing position of any circuit breaker module is in a closed state and this circuit breaker module is an incoming line circuit breaker, the circuit switching module outputs the corresponding incoming line voltage to the corresponding circuit breaker module, otherwise the circuit switching module does not output the corresponding incoming line voltage to the corresponding circuit breaker module.

[0054] like Figure 6 As shown, the automatic test method of standby automatic switching based on dynamic switching of electrical circuits includes the following steps:

[0055] Step 1: Connect the power source voltage output line to the voltage input module;

[0056] Step 2: Connect the bus voltage of the voltage output module and the incoming line voltage output by the circuit breaker module to the corresponding voltage AC terminals of the standby automatic switching device respectively;

[0057] Step 3: Connect the tripping and closing output circuit of the standby automatic switch to the corresponding circuit breaker module;

[0058] Step 4: Connect the position circuit of the standby automatic circuit breaker to the corresponding circuit breaker module;

[0059] Step 5: Set the busbar connection circuit breaker selection switch state of the loop switching module according to the main wiring situation of the substation;

[0060] Step 6: Start the backup automatic switching logic by controlling the manual opening and closing switch of the circuit breaker module;

[0061] Step 7: According to the tripping and closing signal of the standby automatic switch, the circuit switching module automatically switches and completes the test.

[0062] The specific embodiments described herein are merely examples of the present invention. A person skilled in the art may make various modifications, additions or substitutions to the specific embodiments described, but will not deviate from the essence of the present invention or exceed the scope defined by the appended claims.

Claims

1. A standby automatic test device based on dynamic switching of electrical circuits, including a voltage input module, characterized in that: It also includes circuit breaker module, loop switching module and bus voltage output module. The voltage input module is used to access the AC voltage signal output by the power source, generate the bus voltage and multiple groups of incoming line voltages, and output the bus voltage and multiple groups of incoming line voltages to the loop switching module. The circuit breaker module is used to receive the tripping and closing signals of the standby automatic transfer device. The tripping and closing signals include tripping and closing. The circuit breaker position signals are output to the standby automatic transfer device and the circuit switching module. The circuit breaker position signals include tripping and closing. The circuit breaker module receives the incoming line voltage from the circuit switching module and outputs the incoming line voltage to the standby automatic transfer device. A loop switching module is used to control the on / off of the bus voltage and different bus voltage output modules according to the circuit breaker position signal input by the circuit breaker module, and each bus voltage output module is connected to the corresponding bus; The busbar connection circuit breaker selection switch included in the circuit switching module is used to switch the connection relationship between the circuit breaker module and the busbar, so that the circuit breaker module is disconnected from the busbar, or the circuit breaker module is connected to the busbar and serves as an incoming circuit breaker, or the circuit breaker module is connected to the busbar as a bus tie circuit breaker. The busbar connection circuit breaker selection switch state of the circuit switching module is set according to the main wiring situation of the substation. When the tripping and closing signal state of the circuit breaker module connected to the backup automatic re-entry device is in the tripping opening action or the manual opening and closing switch of the circuit breaker module is in the manual opening state, the relay opened in the tripping position of the circuit breaker module remains in the closed state, and the relay opened in the closing position remains in the open state; When the tripping and closing signal state of the circuit breaker module connected to the backup automatic re-entry device is in the closing action or the manual opening and closing switch of the circuit breaker module is in the manual closing state, the relay opened in the tripping position of the circuit breaker module remains in the open state, and the relay opened in the closing position remains in the closed state; When the tripping and closing signals of the circuit breaker module connected to the backup automatic switching device are not activated or the manual opening and closing switches of the circuit breaker module are in the intermediate state, the tripping and closing relays of the circuit breaker module remain unchanged. When the circuit breaker module is connected to both busbars, it is a bus tie circuit breaker; when the circuit breaker module is only connected to one section of busbar, it is an incoming line circuit breaker; If the closing position input corresponding to the incoming circuit breaker connected to any section of the bus is in the closed state, the bus voltage is in a pressurized state, or the closing position input corresponding to the bus tie circuit breaker connected to any section of the bus is in the closed state and the opposite bus voltage is in a pressurized state, then the bus voltage is in a pressurized state; otherwise, the bus voltage state is a non-pressurized state. When it is in a pressurized state, the circuit switching module controls the input bus voltage to be connected to the bus voltage output module corresponding to the bus. When it is in a non-pressurized state, the circuit switching module controls the input bus voltage to be disconnected from the bus voltage output module corresponding to the bus.

2. A method for automatically testing a backup power supply based on dynamic switching of an electrical circuit, using the automatic testing device for automatically testing a backup power supply based on dynamic switching of an electrical circuit as described in claim 1, comprising the following steps: Step 1: Connect the power source voltage output line to the voltage input module; Step 2: Connect the bus voltage of the voltage output module and the incoming line voltage output by the circuit breaker module to the corresponding voltage AC terminals of the standby automatic switching device respectively; Step 3: Connect the tripping and closing output circuit of the standby automatic switch to the corresponding circuit breaker module; Step 4: Connect the position circuit of the standby automatic circuit breaker to the corresponding circuit breaker module; Step 5: Set the busbar connection circuit breaker selection switch state of the loop switching module according to the main wiring situation of the substation; Step 6: Start the backup automatic switching logic by controlling the manual opening and closing switch of the circuit breaker module; Step 7: According to the tripping and closing signal of the standby automatic switch, the circuit switching module automatically switches and completes the test.

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