Spare power automatic switching tester

Abstract

The invention provides a spare power automatic switching tester, which is characterized in that when a spare power automatic switching device simulates plant station voltage loss to carry out spare power automatic switching action, bus voltage loss and spare power switching recovery conditions when two or more buses are connected in a primary wiring mode of an actual power system are simulated through a line connection framework; in the line connection architecture, a power supply is connected with all incoming lines after being connected into a main line, power is supplied to corresponding buses through an upper-stage power switch and a current-stage power switch on the incoming lines, and power supply recovery after interval or voltage loss is realized through a loop formed by connecting all the buses and bus tie switches between the adjacent buses; the upper-level power switches are opened and closed through corresponding manual buttons, and the bus loses voltage if the upper-level power switches are disconnected; the bus and the bus tie switch are both opened and closed by opening and closing actions of the spare power automatic switching device, and the voltage-loss bus restores power supply when the bus tie switch is closed. By implementing the method, not only can the working efficiency and convenience be improved, but also the voltage access requirement of more than two buses and the simulation degree maximization of the actual plant-station voltage-loss backup automatic switching action can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, in particular to a standby automatic switching tester. Background Art

[0002] When testing a backup automatic re-start device, the main principle is to determine if the busbar loses voltage and then restore the voltage by closing the backup component or bus tie sectionalizer. Currently, backup automatic re-start device testing is primarily accomplished using a relay protection tester and a simulated circuit breaker. Specifically, the relay protection tester first outputs an AC voltage to the backup automatic re-start device for analog value determination. Then, the simulated circuit breaker outputs a switch position node to the backup automatic re-start device for switch position status determination. This allows the backup automatic re-start device to control the simulated circuit breaker to simulate the backup automatic re-start operation after a busbar loss of voltage.

[0003] However, the above-mentioned test method of the backup automatic transfer device has the following defects, including: (1) the output analog quantity of the relay protection tester is not designed for the test requirements of the backup automatic transfer device, and is limited to the two bus voltage access requirements, but cannot meet the requirements of more than two bus voltage access; (2) during the test, the relay protection tester does not cooperate with the simulated circuit breaker, which not only makes on-site configuration difficult, but also the action of the simulated circuit breaker only simulates a limited number of actions of the backup automatic transfer after the actual power station loses pressure; (3) the relay protection tester and the simulated circuit breaker are used independently, which not only makes it inconvenient to carry, but also has problems such as complex wiring and low work efficiency.

[0004] Therefore, it is necessary to provide a new automatic switching tester to solve the defects of the automatic switching device testing method mentioned above. Summary of the Invention

[0005] The technical problem to be solved by the embodiments of the present invention is to provide a standby automatic transfer tester that can not only improve work efficiency and convenience, but also meet the requirements of more than two bus voltage access and maximize the simulation degree of standby automatic transfer action after actual power station voltage loss.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a standby automatic transfer tester, which cooperates with a standby automatic transfer device. When the standby automatic transfer device simulates the power station pressure loss and performs the standby automatic transfer action, it simulates the bus pressure loss and standby transfer recovery related situations when two or more busbars are connected in the actual power system primary wiring mode through a preset line connection architecture; wherein,

[0007] The circuit connection structure includes a power supply, a main circuit, a busbar, an incoming line, an upper-level power switch, a current-level power switch, and a bus tie switch; the number of the power supply and the main circuit are both one, and the number of the busbar, the incoming line, the upper-level power switch, and the current-level power switch are equal and are both two or more;

[0008] In the line connection architecture, after the power supply is connected to the main line, the main line is connected to all incoming lines respectively, and power is supplied to the corresponding busbar through an upper power switch and a local power switch provided on each incoming line. In addition, power supply recovery after an interval or voltage loss is achieved by connecting all busbars into a loop and providing a corresponding bus tie switch between two adjacent busbars.

[0009] Each of the upper power switches is opened and closed by a corresponding manual button; each of the local power switches and each of the bus tie switches are connected to the standby automatic switching device and are opened and closed by the opening and closing actions of the standby automatic switching device;

[0010] If one of the upper power switches is disconnected by the corresponding manual button operation, the busbar where the upper power switch is operated in the actual power system primary wiring mode is simulated to lose pressure, and when the standby automatic transfer device simulates the power station loss and performs the standby automatic transfer action, the opening and closing action of the standby automatic transfer device is used to control the disconnection of the power switch of the same level corresponding to the pressure-losing busbar and the closing of any adjacent bus tie switch of the pressure-losing busbar, so as to simulate the power supply restoration of the pressure-losing busbar in the actual power system primary wiring mode.

[0011] Each of the upper power switches is a first double-coil intermediate relay, which is provided with an excitation coil, a demagnetization coil and three normally open contacts;

[0012] The negative potential of the excitation coil of each upper power switch is grounded, and the positive potential is connected to an output terminal of a corresponding manual button and the input terminal of the manual button is connected to the positive voltage, so as to be energized and excited when the manual button is pressed from the initial position;

[0013] The positive potential of the demagnetization coil of each upper power switch is grounded, and the negative potential is connected to the other output terminal of the manual button connected to its corresponding excitation coil, and the input terminal of the manual button is connected to the positive power, so as to power off and demagnetize when the manual button is pressed to return to the initial position;

[0014] The three normally open contacts of each upper power switch are correspondingly connected to the ABC three-phase line of the incoming line, so as to control the on-off of the main line ABC three-phase line connected to the ABC three-phase line of the incoming line.

[0015] Wherein, each of the power switches at this level and each of the bus tie switches is a second double-coil intermediate relay, and the second double-coil intermediate relay is provided with an excitation coil, a demagnetization coil, four normally open contacts and one normally closed contact; wherein,

[0016] The negative potential of the excitation coil of each power switch at this level and each bus tie switch is grounded, and the positive potential is connected to the closing action potential output point of the standby automatic switching device through the corresponding terminal, so as to energize the excitation coil when the standby automatic switching device is closed;

[0017] The positive potential of the demagnetization coil of each power switch at this level and each bus tie switch is grounded, and the negative potential is connected to the tripping action potential output point of the standby automatic transfer device through the corresponding terminal, so as to power off and demagnetize when the standby automatic transfer device trips;

[0018] Three of the four normally open contacts of each power switch at this level and each bus tie switch are connected to the ABC three-phase line of the bus or the connected bus to perform on-off control of the connection between the ABC three-phase of the incoming line and the ABC three-phase of the bus or between two adjacent busbars. The remaining one normally open contact and the normally closed contact of the four normally open contacts are connected to the open-in circuit of the standby automatic switching device through corresponding wiring terminals, so that the standby automatic switching device can monitor the status of the connected switch before and after operation in real time.

[0019] Wherein, the power supply is an AC voltage source.

[0020] The circuit connection structure is integrated on a circuit board and installed inside the housing; all manual buttons and wiring terminals are arranged on the outer surface of the housing.

[0021] Among them, it also includes: three-phase output wiring hole; among them,

[0022] There are multiple three-phase output wiring holes; each three-phase output wiring hole is placed on the outer surface of the shell and is electrically connected with a three-phase conductive contact preset on a corresponding busbar; wherein each phase conductive contact is arranged on one of the three phases ABC of the corresponding busbar.

[0023] The implementation of the embodiments of the present invention has the following beneficial effects:

[0024] The backup automatic transfer tester of the present invention can simulate the power system to be arranged according to the actual wiring, and has the same electrical characteristics as the real power system. It can completely and realistically simulate the action of the actual power system pressure loss and its backup automatic transfer device after pressure loss. It can not only improve work efficiency and convenience, but also meet the requirements of more than two bus voltage access and maximize the degree of simulation of the actual power plant voltage loss backup automatic transfer action. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0026] Figure 1 A connection diagram of a line connection architecture in a standby automatic tester provided in an embodiment of the present invention;

[0027] Figure 2 This is an electrical connection diagram of a single upper power switch in a line connection architecture of a standby automatic switching tester provided in an embodiment of the present invention;

[0028] Figure 3 This is an electrical connection diagram of a single power switch at this level in a line connection architecture of a standby automatic switching tester provided in an embodiment of the present invention;

[0029] Figure 4 This is a diagram of an application scenario of a line connection architecture in a standby automatic tester provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0031] like Figure 1 As shown in the figure, a standby automatic switching tester is proposed in an embodiment of the present invention. It cooperates with a standby automatic switching device (not shown). When the standby automatic switching device simulates the power station pressure loss and performs the standby automatic switching action, it simulates the bus pressure loss and standby switching recovery related situations when two or more busbars are connected in the actual power system primary wiring mode through a preset line connection architecture; wherein,

[0032] The line connection architecture includes a power supply 1, a main line 2, a busbar 3, an incoming line 4, an upper-level power switch 5, a current-level power switch 6, and a bus tie switch 7. The number of power supply 1 and main line 2 is one, and the number of busbar 3, incoming line 4, upper-level power switch 5, and current-level power switch 6 is equal and two or more. It should be noted that the power supply 1 is an AC voltage source. It is understandable that multiple power supplies 1 can be designed (for example, including AC voltage sources, DC voltage sources, and AC current sources), which are switched through different switches when connected to the main line 2 to meet different test requirements. This will not be repeated here.

[0033] In this line connection architecture, after the power source 1 is connected to the main line 2, the main line 2 is connected to all incoming lines 4. Power is then supplied to the corresponding busbar 3 via an upper power switch 5 and a local power switch 6 provided on each incoming line 4. Power restoration after an interval or voltage loss is achieved by connecting all busbars 3 into a loop and providing a corresponding bus tie switch 7 between two adjacent busbars 3.

[0034] Each upper power switch 5 is opened and closed by a corresponding manual button (not shown); each local power switch 6 and each bus tie switch 7 are connected to a standby automatic switching device and are opened and closed by the opening and closing actions of the standby automatic switching device; it should be noted that the manual button can realize the single-pole double-throw function, closing the switch when pressed and opening the switch when pressed.

[0035] If a certain upper power switch 5 is disconnected by the corresponding manual button operation, the busbar where the upper power switch operated is located in the actual power system primary wiring mode is simulated to lose pressure, and when the standby automatic transfer device simulates the power station loss and performs the standby automatic transfer action, the opening and closing action of the standby automatic transfer device controls the power switch 6 of the same level corresponding to the pressure-losing busbar and the closing of any adjacent bus tie switch 7 of the pressure-losing busbar to simulate the power supply recovery of the pressure-losing busbar in the actual power system primary wiring mode.

[0036] In the embodiment of the present invention, Figure 2 As shown, each upper power switch 5 is a first double-coil intermediate relay, which is provided with an excitation coil, a demagnetization coil and three normally open contacts; wherein,

[0037] The negative potential of the excitation coil of each upper power switch 5 is grounded, and the positive potential is connected to an output terminal of a corresponding manual button and the input terminal of the manual button is connected to the positive voltage, so that the excitation coil is energized when the manual button is pressed from the initial position;

[0038] The positive potential of the demagnetization coil of each upper power switch 5 is grounded, and the negative potential is connected to the other output terminal of the manual button connected to its corresponding excitation coil and the input terminal of the manual button is connected to the positive voltage, so that the power is turned off and demagnetized when the manual button is pressed to return to the initial position;

[0039] The three normally open contacts of each upper power switch 5 are correspondingly connected to the ABC three-phase lines of the incoming line to control the connection of the ABC three-phases of the main line 2 to the ABC three-phases of the incoming line.

[0040] It should be noted that the positive voltage connected to the input terminal of the manual button comes from the internal working voltage source, such as DC12V, DC24V, etc.

[0041] In the embodiment of the present invention, each power switch 6 at this level and each bus tie switch 7 is a second double-coil intermediate relay, and the second double-coil intermediate relay is provided with an excitation coil, a demagnetization coil, four normally open contacts and a normally closed contact. Figure 3 shown; among them,

[0042] The negative potential of the excitation coil of each power switch 6 at this level and each bus tie switch 7 is grounded, and the positive potential is connected to the closing action potential output point of the standby automatic switching device through the corresponding terminal (not shown) to energize the excitation coil when the standby automatic switching device is closed;

[0043] The positive potential of the demagnetization coil of each power switch 6 at this level and each bus tie switch 7 is grounded, and the negative potential is connected to the tripping action potential output point of the standby automatic transfer device through the corresponding terminal, so as to power off and demagnetize when the standby automatic transfer device trips;

[0044] Three of the four normally open contacts of each power switch 6 at this level and each bus tie switch 7 are connected to the ABC three-phase line of the bus or the connected bus, so as to control the connection of the ABC three-phase of the incoming line to the ABC three-phase of the bus or between two adjacent busbars. The remaining one normally open contact and the normally closed contact of the four normally open contacts are connected to the open-in circuit of the standby automatic switching device through corresponding wiring terminals, so that the standby automatic switching device can monitor the status before and after the operation of the connected switches in real time, that is, the status before and after the operation of the power switch 6 at this level and the bus tie switch 7 is judged by the opening and closing status of the normally open contact and the normally closed contact.

[0045] It is understood that the automatic switching tester of the present invention integrates the circuit connection structure on a circuit board and is mounted within a housing (i.e., the housing of the automatic switching tester), while all manual buttons and wiring terminals are located on the outer surface of the housing. Furthermore, the outer surface of the housing of the automatic switching tester is provided with a plurality of three-phase output wiring holes (not shown), each of which is electrically connected to a three-phase conductive contact 8 pre-installed on a corresponding busbar. This allows for real-time monitoring of busbar voltage loss and voltage recovery using a voltage measuring instrument or automatic switching device. Each phase conductive contact 8 is located on one of the three phases ABC of the corresponding busbar.

[0046] like Figure 4 As shown, the application scenario of the standby automatic tester in the embodiment of the present invention is further explained as follows:

[0047] The power supply has multiple circuits, connected to the main line and switched via different switches to meet different testing requirements. In this case, two voltage sources are designed: one directly powers the simulation system, while the other can be independently configured for voltage and voltage-free constant value verification. This can also be used in conjunction with the current circuit to perform simple protection device debugging when necessary. A single current source can be designed to perform current blocking and fault load shedding functions for backup automatic switching devices, and can also be used in conjunction with the voltage source to perform simple protection device debugging when necessary. A single DC power supply can be designed to not only power the device being debugged but also power the switch coil to achieve analog switch control.

[0048] Four incoming lines are designed to connect to four busbars, each with two control switches, one for the upstream power supply and one for the local power supply, corresponding to the switches on either side of the line or main transformer. In addition, four bus tie switches are designed to simulate bus tie sectionalizing control across the four busbars. These four busbars can simulate the electrical systems of most substations, enabling circuit access for various wiring configurations, including 220kV dual-bus dual-tap wiring, 110kV single-bus sectionalizing wiring, and 10kV single-bus sectionalizing wiring.

[0049] Figure 4 In the figure, voltage source 1 is an AC voltage source, which is connected to the main line L0; the four incoming lines correspond to line L1, line L2, line L3 and line L4 respectively; the four busbars correspond to "1M busbar", "2M busbar", "3M busbar" and "4M busbar" respectively; the four upper-level power switches include K1 switch, K2 switch, K3 switch and K4 switch; the four local-level power switches include 01 switch, 02 switch, 03 switch and 04 switch; the four bus tie switches include 12 switch, 23 switch, 34 switch and 14 switch; the three round holes (such as O) on the 1M busbar, 2M busbar, 3M busbar and 4M busbar represent the three-phase conductive contacts on each busbar, and are connected to external voltage measuring instruments through the corresponding three-phase output wiring holes, thereby forming a simulated electrical system that meets the logic of the standby automatic transfer device.

[0050] For example, if both K1 and 01 switches are in the closed position, line L1 is the main supply line for busbar 1M; if K1 is in the closed position and 01 is in the open position, line L1 is the backup supply line for busbar 1M; if K1 is in the open position, line L1 is in the maintenance state. Based on the same principle, the same logic can be applied to other buses.

[0051] exist Figure 4 In the simulation, when it is necessary to simulate the voltage loss of the 1M bus, the K1 switch is disconnected by manual button operation. At this time, the voltage of the voltage source 1 cannot reach the voltage of the 1M bus, thereby simulating the voltage loss of the 1M bus where the K1 switch is operated in the actual power system primary wiring mode.

[0052] At this point, switches 02 through 04 are closed, making lines L2 through L4 the main supply lines for busbars 2M through 4M, respectively. When the backup automatic switching device operates, it issues a trip command to open switch 01 and a close command to close switch 12 or 14, restoring power from busbar 2M or 4M to busbar 1M.

[0053] The implementation of the embodiments of the present invention has the following beneficial effects:

[0054] The backup automatic transfer tester of the present invention can simulate the power system to be arranged according to the actual wiring, and has the same electrical characteristics as the real power system. It can completely and realistically simulate the action of the actual power system pressure loss and its backup automatic transfer device after pressure loss. It can not only improve work efficiency and convenience, but also meet the requirements of more than two bus voltage access and maximize the degree of simulation of the actual power plant voltage loss backup automatic transfer action.

[0055] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A self-testing instrument for standby power supply, which is used in conjunction with a self-testing device, characterized in that: When the standby automatic switching device simulates the power station pressure loss and performs the standby automatic switching action, the preset line connection structure is used to simulate the relevant situations of bus pressure loss and standby switching recovery when two or more busbars are connected in the actual power system primary wiring mode; wherein, The circuit connection structure includes a power supply, a main circuit, a busbar, an incoming line, an upper-level power switch, a current-level power switch, and a bus tie switch; the number of the power supply and the main circuit are both one, and the number of the busbar, the incoming line, the upper-level power switch, and the current-level power switch are equal and are both two or more; In the line connection architecture, after the power supply is connected to the main line, the main line is connected to all incoming lines respectively, and power is supplied to the corresponding busbar through an upper power switch and a local power switch provided on each incoming line. In addition, power supply recovery after an interval or voltage loss is achieved by connecting all busbars into a loop and providing a corresponding bus tie switch between two adjacent busbars. Each of the upper power switches is opened and closed by a corresponding manual button; each of the local power switches and each of the bus tie switches are connected to the standby automatic switching device and are opened and closed by the opening and closing actions of the standby automatic switching device; If one of the upper power switches is disconnected by the corresponding manual button operation, the busbar where the upper power switch is operated in the actual power system primary wiring mode is simulated to lose pressure, and when the standby automatic transfer device simulates the power station loss and performs the standby automatic transfer action, the opening and closing action of the standby automatic transfer device is used to control the disconnection of the power switch of the same level corresponding to the pressure-losing busbar and the closing of any adjacent bus tie switch of the pressure-losing busbar, so as to simulate the power supply restoration of the pressure-losing busbar in the actual power system primary wiring mode.

2. The automatic tester as claimed in claim 1, characterized in that: Each of the upper power switches is a first double-coil intermediate relay, which is provided with an excitation coil, a demagnetization coil and three normally open contacts; wherein, The negative potential of the excitation coil of each upper power switch is grounded, and the positive potential is connected to an output terminal of a corresponding manual button and the input terminal of the manual button is connected to the positive voltage, so as to be energized and excited when the manual button is pressed from the initial position; The positive potential of the demagnetization coil of each upper power switch is grounded, and the negative potential is connected to the other output terminal of the manual button connected to its corresponding excitation coil, and the input terminal of the manual button is connected to the positive power, so as to power off and demagnetize when the manual button is pressed to return to the initial position; The three normally open contacts of each upper power switch are correspondingly connected to the ABC three-phase line of the incoming line, so as to control the on-off of the main line ABC three-phase line connected to the ABC three-phase line of the incoming line.

3. The automatic tester as claimed in claim 2, characterized in that: Each of the power switches at this level and each of the bus tie switches is a second double-coil intermediate relay, and the second double-coil intermediate relay is provided with an excitation coil, a demagnetization coil, four normally open contacts and one normally closed contact; wherein, The negative potential of the excitation coil of each power switch at this level and each bus tie switch is grounded, and the positive potential is connected to the closing action potential output point of the standby automatic switching device through the corresponding terminal, so as to energize the excitation coil when the standby automatic switching device is closed; The positive potential of the demagnetization coil of each power switch at this level and each bus tie switch is grounded, and the negative potential is connected to the tripping action potential output point of the standby automatic transfer device through the corresponding terminal, so as to power off and demagnetize when the standby automatic transfer device trips; Three of the four normally open contacts of each power switch at this level and each bus tie switch are connected to the ABC three-phase line of the bus or the connected bus to perform on-off control of the connection between the ABC three-phase of the incoming line and the ABC three-phase of the bus or between two adjacent busbars. The remaining one normally open contact and the normally closed contact of the four normally open contacts are connected to the open-in circuit of the standby automatic switching device through corresponding wiring terminals, so that the standby automatic switching device can monitor the status of the connected switch before and after operation in real time.

4. The automatic tester as claimed in claim 3, characterized in that: The power supply is an AC voltage source.

5. The automatic tester as claimed in claim 4, characterized in that: The circuit connection structure is integrated on the circuit board and installed inside the shell; all manual buttons and wiring terminals are arranged on the outer surface of the shell.

6. The automatic tester as claimed in claim 5, characterized in that: Also includes: Three-phase output wiring hole; among them, There are multiple three-phase output wiring holes; each three-phase output wiring hole is placed on the outer surface of the shell and is electrically connected with a three-phase conductive contact preset on a corresponding busbar; wherein each phase conductive contact is arranged on one of the three phases ABC of the corresponding busbar.

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