27.5kV voltage merging intelligent device and system for traction substation

Abstract

The utility model discloses a 27.5kV voltage merging intelligent device and system for a traction substation, and relates to the technical field of signal acquisition, comprising a state acquisition module for acquiring the switch state of a circuit breaker and a knife switch in the substation, and an analog quantity acquisition module for acquiring the 27.5kV bus voltage of the substation, wherein the analog quantity acquisition module comprises a voltage switching unit; an output module for outputting the 27.5kV bus voltage; the state acquisition module and the analog quantity acquisition module are both electrically connected to the output module; the voltage switching unit is used for switching to different voltage transformers to acquire the low-voltage side bus voltage, and the different voltage transformers are installed on the same low-voltage side bus voltage; by setting the voltage switching unit, automatic switching to different voltage transformers connected to the same low-voltage side bus voltage to acquire the low-voltage side bus voltage is achieved, thereby avoiding cumbersome signal acquisition process, and at the same time, no locking protection is performed during switching.

Description

Technical Field

[0001] The utility model relates to the technical field of signal acquisition, and in particular to a 27.5 kV voltage merging intelligent device and system for a traction substation. Background Art

[0002] Electrified railway traction substations, substations, switch stations and AT stations need to complete the operation control and switch quantity status collection of the circuit breakers in the switch bays and their related isolation switches, earthing switches and fast earthing switches, complete the sampling of current data and voltage data, and output the data to the process layer network or related intelligent electronic devices through optical fiber according to the DL / T 860.92 protocol.

[0003] Traditional signal acquisition devices implement sampling of current and voltage data. During operation, the voltage transformer on the bus is prone to abnormalities such as disconnection, requiring locking protection before the voltage transformer can be switched. The signal acquisition process is cumbersome and inefficient. Utility Model Content

[0004] The technical problem to be solved by the utility model is that during the process of voltage data collection by traditional signal acquisition devices, the voltage transformer on the bus is prone to abnormalities such as disconnection during operation, and locking protection is required before the voltage transformer can be switched. The signal acquisition process is cumbersome and inefficient. The purpose of the utility model is to provide a 27.5kV voltage merging intelligent device and system for traction substations. By setting a voltage switching unit, it is possible to automatically switch different voltage transformers connected to the same low-voltage side bus voltage to collect the low-voltage side bus voltage, thereby avoiding cumbersome signal acquisition process, and at the same time, no locking protection is performed during switching.

[0005] The utility model is realized by the following technical solutions:

[0006] This solution provides a 27.5kV voltage merging intelligent device for traction substations, including:

[0007] The state acquisition module is used to collect the switch state of the knife switch in the substation;

[0008] An analog quantity acquisition module is used to collect the 27.5 kV bus voltage of the substation; the analog quantity acquisition module includes a voltage switching unit;

[0009] An output module is used to output the switch quantity state and 27.5kV bus voltage; the state acquisition module and the analog quantity acquisition module are both electrically connected to the output module;

[0010] The voltage switching unit is used to switch and connect to different voltage transformers to collect the low-voltage side bus voltage, and the different voltage transformers are installed on the same low-voltage side bus voltage.

[0011] Working principle of this scheme: For electrified railway traction substations, substations, switch stations and AT stations, the voltages of the two current sensors under the T1, F1 phase bus, T2 phase bus and F2 phase bus on the low-voltage side must be connected to the signal acquisition device. When a current sensor on the bus is broken during operation, and the signal acquisition device is using the voltage of the current sensor, the information acquisition device provided by this scheme can switch the voltage to another current sensor on the same bus in time, and the protection is not locked during the switching.

[0012] A further optimization scheme is that the low-voltage side bus includes: T1 phase bus, F1 phase bus, T2 phase bus and F2 phase bus;

[0013] The T1 phase bus is provided with a voltage transformer T1-1 and a voltage transformer T1-2;

[0014] The F1 phase busbar is provided with a voltage transformer F1-1 and a voltage transformer F1-2;

[0015] The T2 phase bus is provided with a voltage transformer T2-1 and a voltage transformer T2-2;

[0016] The F2 phase busbar is equipped with a voltage transformer F2-1 and a voltage transformer F2-2.

[0017] A further optimized solution is that the voltage switching unit includes a voltage acquisition unit, a voltage determination unit, a no-voltage determination unit and a switching determination unit which are electrically connected in sequence;

[0018] The voltage collection unit is connected to the voltage transformer T1-1 and is used to collect the voltage UT1-1;

[0019] The voltage collection unit is connected to the voltage transformer T1-2 and is used to collect the voltage UT1-2;

[0020] The voltage collection unit is connected to the voltage transformer F1-1 and is used to collect the voltage UF1-1;

[0021] The voltage collection unit is connected to the voltage transformer F1-2 and is used to collect the voltage UF1-2;

[0022] The voltage collection unit is connected to the voltage transformer T2-1 and is used to collect the voltage UT2-1;

[0023] The voltage collection unit is connected to the voltage transformer T2-2 and is used to collect the voltage UT2-3;

[0024] The voltage collection unit is connected to the voltage transformer F2-1 and is used to collect the voltage UF2-1;

[0025] The voltage collection unit is connected to the voltage transformer F2-2 and is used to collect the voltage UF2-2;

[0026] The voltage determination unit is connected to the voltage acquisition unit and is used to determine whether voltage transformer T1-1, voltage transformer T1-2, voltage transformer F1-1, voltage transformer F1-2, voltage transformer T2-1, voltage transformer T2-2, voltage transformer F2-1 and voltage transformer F2-2 are under voltage;

[0027] The no-voltage determination unit is connected to the voltage acquisition unit and is used to determine whether the voltage transformer T1-1, the voltage transformer T1-2, the voltage transformer F1-1, the voltage transformer F1-2, the voltage transformer T2-1, the voltage transformer T2-2, the voltage transformer F2-1 and the voltage transformer F2-2 are no-voltage;

[0028] The output ends of the voltage determination unit and the no-voltage determination unit are connected to the switching determination unit, which is used to determine whether to connect the voltage transformer T1-1 or the voltage transformer T1-2; the voltage transformer F1-1 or the voltage transformer F1-2; the voltage transformer T2-1 or the voltage transformer T2-2; the voltage transformer F2-1 or the voltage transformer F2-2.

[0029] A further optimized solution is that the voltage determination unit includes: a first protection signal collector, a first comparator, a first OR gate, and a first delay device; the first protection signal collector is used to collect the "open electrical quantity protection" signal;

[0030] For the voltage transformer j on the i-phase bus, i=T1, F1, T2, F2; j=T1-1, T1-2, F1-1, F1-2, T2-1, T2-2, F2-1, F2-21; when the voltage transformer j on the i-phase bus is started with voltage, the voltage Uj collected by the voltage acquisition unit is connected to the positive input terminal of the first comparator, the voltage switching voltage value is connected to the negative input terminal of the first comparator, and the output terminal of the first comparator is connected to the first input terminal of the first OR gate; the first protection signal collector is connected to the second input terminal of the first OR gate; the output terminal of the first OR gate is connected to the first delay device and then outputs "the voltage transformer j on the i-phase bus has voltage".

[0031] A further optimized solution is that the no-voltage determination unit includes: a second protection signal collector, a second comparator, a second OR gate, and a second delay device; the second protection signal collector is used to collect the "open electrical quantity protection" signal;

[0032] For the voltage transformer j on the i-phase bus, i=T1, F1, T2, F2; j=T1-1, T1-2, F1-1, F1-2, T2-1, T2-2, F2-1, F2-21; when the voltage transformer j on the i-phase bus is started without voltage, the voltage Uj collected by the voltage acquisition unit is connected to the positive input terminal of the second comparator, the voltage switching pressure value is connected to the negative input terminal of the second comparator, and the output terminal of the second comparator is connected to the first input terminal of the second OR gate; the second protection signal collector is connected to the second input terminal of the second OR gate; the output terminal of the second OR gate is connected to the second delay device and then outputs "there is no voltage on the voltage transformer j on the i-phase bus".

[0033] A further optimization scheme is that each phase bus is matched with a switching determination unit, and the switching determination unit includes a first switching determination unit, a second switching determination unit and a switching unit;

[0034] The first switching determination unit includes: a first quantile signal collector, a second quantile signal collector, a first AND gate, a second AND gate and a third OR gate; the first quantile signal collector is used to collect the "bus coupler separation quantile 1 is 1" signal, and the second quantile signal collector is used to collect the "bus coupler separation quantile 2 is 1" signal;

[0035] For the voltage transformer j1 and the voltage transformer j2 on the i-phase bus, the output end of the no-voltage judgment unit that outputs "there is no voltage on the voltage transformer j1 on the i-phase bus" is connected to the first input end of the first AND gate; the output end of the no-voltage judgment unit that outputs "there is no voltage on the voltage transformer j2 on the i-phase bus" is connected to the second input end of the first AND gate; the output end of the first AND gate is connected to the first input end of the third OR gate; the output end of the first quantile signal collector is connected to the first input end of the second AND gate, the output end of the second quantile signal collector is inverted and connected to the second input end of the second AND gate, the output end of the second AND gate is connected to the second input end of the third OR gate, and the output end of the third OR gate outputs "the i-phase bus voltage is switched to voltage transformer j2".

[0036] A further optimized solution is that the second switching determination unit includes: a third AND gate, a fourth AND gate and a fourth OR gate;

[0037] For the voltage transformer j1 and the voltage transformer j2 on the i-phase bus, the output end of the no-voltage determination unit that outputs "there is no voltage on the voltage transformer j2 on the i-phase bus" is connected to the first input end of the third AND gate; the output end of the no-voltage determination unit that outputs "there is no voltage on the voltage transformer j1 on the i-phase bus" is connected to the second input end of the third AND gate; the output end of the third AND gate is connected to the first input end of the fourth OR gate; the output end of the first quantile signal collector is inverted and connected to the first input end of the fourth AND gate, the output end of the second quantile signal collector is connected to the second input end of the fourth AND gate, the output end of the fourth AND gate is connected to the second input end of the fourth OR gate, and the output end of the fourth OR gate outputs "the i-phase bus voltage is switched to voltage transformer j1".

[0038] A further optimized solution is that the switching unit includes: a first two-choice switch and a second two-choice switch;

[0039] The output end of the fourth OR gate is connected to the third input end of the first two-select-one switch, the second input end of the first two-select-one switch is set to a low level, and the first input end of the first two-select-one switch is connected to the output end of the second two-select-one switch;

[0040] The output end of the first two-select-one switch is connected to the first input end of the second two-select-one switch, the second input end of the second two-select-one switch is set to a high level, and the output end of the third OR gate is connected to the third input end of the second two-select-one switch.

[0041] This solution also provides a signal acquisition system with a voltage switching function, including the above-mentioned traction substation 27.5kV voltage merging intelligent device.

[0042] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0043] The utility model aims to provide a 27.5kV voltage merging intelligent device and system for traction substation, which is improved on the basis of the existing signal acquisition device. By setting a voltage switching unit, it can realize automatic switching of different voltage transformers connected to the same low-voltage side bus voltage to collect the low-voltage side bus voltage, avoid the cumbersome signal acquisition process, and at the same time, the protection is not locked during the switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0045] Figure 1 This is a schematic diagram of the structure of the 27.5kV voltage merging intelligent device for traction substation;

[0046] Figure 2 It is the schematic diagram of the assembly of low voltage side busbar and signal acquisition device;

[0047] Figure 3 A is a schematic diagram of the circuit structure of the pressure determination unit;

[0048] Figure 4 Schematic diagram B of the circuit structure of the pressure determination unit;

[0049] Figure 5 A is a schematic diagram of the circuit structure of the no-pressure determination unit;

[0050] Figure 6 It is the circuit structure diagram B of the no-pressure determination unit;

[0051] Figure 7 is a schematic diagram of the circuit structure of the first switching determination unit;

[0052] Figure 8 is a schematic diagram of the circuit structure of the second switching determination unit;

[0053] Fig. 9 Schematic diagram of the switching unit circuit structure. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation methods of the utility model and their descriptions are only used to explain the utility model and are not intended to limit the utility model.

[0055] Example 1

[0056] This embodiment 1 provides a 27.5kV voltage merging intelligent device for traction substation, such as Figure 1 As shown, including:

[0057] The state acquisition module is used to collect the switch state of the knife switch in the substation;

[0058] An analog quantity acquisition module is used to collect the 27.5 kV bus voltage of the substation; the analog quantity acquisition module includes a voltage switching unit;

[0059] An output module is used to output the switch quantity state and 27.5kV bus voltage; the state acquisition module and the analog quantity acquisition module are both electrically connected to the output module;

[0060] The voltage switching unit is used to switch and connect to different voltage transformers to collect the low-voltage side bus voltage, and the different voltage transformers are installed on the same low-voltage side bus voltage.

[0061] like Figure 2 As shown, the low-voltage side bus includes: T1 phase bus, F1 phase bus, T2 phase bus and F2 phase bus;

[0062] The T1 phase bus is equipped with voltage transformer T1-1 and voltage transformer T1-2; the F1 phase bus is equipped with voltage transformer F1-1 and voltage transformer F1-2; the T2 phase bus is equipped with voltage transformer T2-1 and voltage transformer T2-2; the F2 phase bus is equipped with voltage transformer F2-1 and voltage transformer F2-2.

[0063] The voltage switching unit includes a voltage acquisition unit, a voltage determination unit, a no-voltage determination unit and a switching determination unit which are electrically connected in sequence; the voltage acquisition unit is connected to the voltage transformer T1-1 for acquiring the voltage UT1-1; the voltage acquisition unit is connected to the voltage transformer T1-2 for acquiring the voltage UT1-2; the voltage acquisition unit is connected to the voltage transformer F1-1 for acquiring the voltage UF1-1; the voltage acquisition unit is connected to the voltage transformer F1-2 for acquiring the voltage UF1-2; the voltage acquisition unit is connected to the voltage transformer T2-1 for acquiring the voltage UT2-1; the voltage acquisition unit is connected to the voltage transformer T2-2 for acquiring the voltage UT2-3; the voltage acquisition unit is connected to the voltage transformer F2-1 for acquiring the voltage UF2-1;

[0064] The voltage collection unit is connected to the voltage transformer F2-2 and is used to collect the voltage UF2-2;

[0065] The voltage determination unit is connected to the voltage acquisition unit and is used to determine whether voltage transformer T1-1, voltage transformer T1-2, voltage transformer F1-1, voltage transformer F1-2, voltage transformer T2-1, voltage transformer T2-2, voltage transformer F2-1 and voltage transformer F2-2 are under voltage;

[0066] The no-voltage determination unit is connected to the voltage acquisition unit, and is used to determine whether the voltage transformer T1-1, the voltage transformer T1-2, the voltage transformer F1-1, the voltage transformer F1-2, the voltage transformer T2-1, the voltage transformer T2-2, the voltage transformer F2-1 and the voltage transformer F2-2 are no-voltage;

[0067] The output ends of the voltage determination unit and the no-voltage determination unit are connected to the switching determination unit, which is used to determine whether to connect the voltage transformer T1-1 or the voltage transformer T1-2; the voltage transformer F1-1 or the voltage transformer F1-2; the voltage transformer T2-1 or the voltage transformer T2-2; the voltage transformer F2-1 or the voltage transformer F2-2.

[0068] The voltage determination unit comprises: a first protection signal collector, a first comparator, a first OR gate, and a first delay device; the first protection signal collector is used to collect the "open electrical quantity protection" signal;

[0069] For voltage transformer j on the i-phase bus, i = T1, F1, T2, F2; j = T1-1, T1-2, F1-1, F1-2, T2-1, T2-2, F2-1, F2-21; Figure 3 and Figure 4 As shown, when the voltage transformer j on the i-phase bus is started with voltage, the voltage Uj collected by the voltage acquisition unit is connected to the positive input terminal of the first comparator, the voltage switching voltage value is connected to the negative input terminal of the first comparator, and the output terminal of the first comparator is connected to the first input terminal of the first OR gate; the first protection signal collector is connected to the second input terminal of the first OR gate; the output terminal of the first OR gate is connected to the first delay device Tqhyy and then outputs "the voltage transformer j on the i-phase bus is under voltage".

[0070] Figure 3 The figure shows the voltage determination process of the voltage transformer T1-1 and the voltage transformer T1-2 on the T1 phase bus, and the voltage transformer F1-1 and the voltage transformer F1-2 on the F1 phase bus. Figure 4 The figure shows the process of determining whether the voltage transformer T2-1 and the voltage transformer T2-2 on the T2 phase bus and the voltage transformer F2-1 and the voltage transformer F2-2 on the F2 phase bus are under voltage.

[0071] The no-voltage determination unit includes: a second protection signal collector, a second comparator, a second OR gate, and a second delay device; the second protection signal collector is used to collect the "open electrical quantity protection" signal;

[0072] For voltage transformer j on the i-phase bus, i = T1, F1, T2, F2; j = T1-1, T1-2, F1-1, F1-2, T2-1, T2-2, F2-1, F2-21; Figure 5 and Figure 6 As shown, when the voltage transformer j on the i-phase bus is started without voltage, the voltage Uj collected by the voltage acquisition unit is connected to the positive input terminal of the second comparator, the voltage switching pressure value is connected to the negative input terminal of the second comparator, and the output terminal of the second comparator is connected to the first input terminal of the second OR gate; the second protection signal collector is connected to the second input terminal of the second OR gate; the output terminal of the second OR gate is connected to the second delay device Tqhyy and then outputs "the voltage transformer j on the i-phase bus has no voltage".

[0073] Figure 5 The figure shows the no-voltage determination process of the voltage transformer T1-1 and the voltage transformer T1-2 on the T1 phase bus, and the voltage transformer F1-1 and the voltage transformer F1-2 on the F1 phase bus. Figure 6 The figure shows the no-voltage determination process of the voltage transformer T2-1 and the voltage transformer T2-2 on the T2-phase bus, and the voltage transformer F2-1 and the voltage transformer F2-2 on the F2-phase bus.

[0074] Each phase bus is matched with a switching determination unit, and the switching determination unit includes a first switching determination unit, a second switching determination unit and a switching unit;

[0075] The first switching determination unit includes: a first quantile signal collector, a second quantile signal collector, a first AND gate, a second AND gate and a third OR gate; the first quantile signal collector is used to collect the "bus coupler separation quantile 1 is 1" signal, and the second quantile signal collector is used to collect the "bus coupler separation quantile 2 is 1" signal;

[0076] For the voltage transformer j1 and voltage transformer j2 on the i-phase bus, if Figure 7 As shown, the output end of the no-voltage judgment unit that outputs "there is no voltage on the voltage transformer j1 on the i-phase bus" is connected to the first input end of the first AND gate; the output end of the no-voltage judgment unit that outputs "there is no voltage on the voltage transformer j2 on the i-phase bus" is connected to the second input end of the first AND gate; the output end of the first AND gate is connected to the first input end of the third OR gate; the output end of the first quantile signal collector is connected to the first input end of the second AND gate, the output end of the second quantile signal collector is inverted and connected to the second input end of the second AND gate, the output end of the second AND gate is connected to the second input end of the third OR gate, and the output end of the third OR gate outputs "the i-phase bus voltage is switched to voltage transformer j2". Figure 7 Only the process of switching the T1 phase bus voltage to the voltage transformer j2 is shown, and the principles of the other buses are the same.

[0077] The second switching determination unit includes: a third AND gate, a fourth AND gate and a fourth OR gate;

[0078] For the voltage transformer j1 and voltage transformer j2 on the i-phase bus, if Figure 8 As shown, the output end of the no-voltage judgment unit that outputs "there is no voltage on the voltage transformer j2 on the i-phase bus" is connected to the first input end of the third AND gate; the output end of the no-voltage judgment unit that outputs "there is no voltage on the voltage transformer j1 on the i-phase bus" is connected to the second input end of the third AND gate; the output end of the third AND gate is connected to the first input end of the fourth OR gate; the output end of the first quantile signal collector is inverted and connected to the first input end of the fourth AND gate, the output end of the second quantile signal collector is connected to the second input end of the fourth AND gate, the output end of the fourth AND gate is connected to the second input end of the fourth OR gate, and the output end of the fourth OR gate outputs "the i-phase bus voltage is switched to the voltage transformer j1". Figure 8 Only the process of switching the T1 phase bus voltage to the voltage transformer j1 is shown, and the principles of the other buses are the same.

[0079] During the specific implementation process, when the T1F1 bus coupler isolation position 1 is 1, the voltage transformer 1PT of the T1 and F1 phase busbars is exited; when the T1F1 bus coupler isolation position 2 is 1, the voltage transformer 2PT of the T1 and F1 phase busbars is exited; when the T2F2 bus coupler isolation position 1 is 1, the voltage transformer bus 1PT of the T2 and F2 phases is exited; when the T2F2 bus coupler isolation position 2 is 1, the voltage transformer 2PT of the T2 and F2 phase busbars is exited.

[0080] The switching unit comprises: a first two-choose-one switch and a second two-choose-one switch;

[0081] like Fig. 9 As shown, the output end of the fourth OR gate is connected to the third input end of the first two-select-one switch, the second input end of the first two-select-one switch is set to a low level, and the first input end of the first two-select-one switch is connected to the output end of the second two-select-one switch;

[0082] The output end of the first two-select-one switch is connected to the first input end of the second two-select-one switch, the second input end of the second two-select-one switch is set to a high level, and the output end of the third OR gate is connected to the third input end of the second two-select-one switch. Fig. 9 Only the process of switching the T1 phase bus voltage to the voltage transformer j1 or the voltage transformer j2 is shown, and the principles of the other buses are the same.

[0083] Example 2

[0084] This embodiment provides a signal acquisition system with a voltage switching function, including the 27.5 kV voltage merging intelligent device of the traction substation of Embodiment 1.

[0085] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. 27.5kV voltage merging intelligent device for traction substation, characterized by: include: The state acquisition module is used to collect the switch state of the knife switch in the substation; An analog quantity acquisition module is used to collect the 27.5 kV bus voltage of the substation; the analog quantity acquisition module includes a voltage switching unit; An output module is used to output the switch quantity state and 27.5kV bus voltage; the state acquisition module and the analog quantity acquisition module are both electrically connected to the output module; The voltage switching unit is used to switch and connect to different voltage transformers to collect the low-voltage side bus voltage, and the different voltage transformers are installed on the same low-voltage side bus voltage.

2. The 27.5 kV voltage merging intelligent device for traction substation according to claim 1 is characterized in that: The low-voltage side busbar includes: a T1 phase busbar, an F1 phase busbar, a T2 phase busbar and an F2 phase busbar; The T1 phase bus is provided with a voltage transformer T1-1 and a voltage transformer T1-2; The F1 phase busbar is provided with a voltage transformer F1-1 and a voltage transformer F1-2; The T2 phase bus is provided with a voltage transformer T2-1 and a voltage transformer T2-2; The F2 phase busbar is equipped with a voltage transformer F2-1 and a voltage transformer F2-2.

3. The 27.5 kV voltage merging intelligent device for traction substation according to claim 2 is characterized in that: The voltage switching unit includes a voltage acquisition unit, a voltage determination unit, a no-voltage determination unit and a switching determination unit which are electrically connected in sequence; The voltage collection unit is connected to the voltage transformer T1-1 and is used to collect the voltage UT1-1; The voltage collection unit is connected to the voltage transformer T1-2 and is used to collect the voltage UT1-2; The voltage collection unit is connected to the voltage transformer F1-1 and is used to collect the voltage UF1-1; The voltage collection unit is connected to the voltage transformer F1-2 and is used to collect the voltage UF1-2; The voltage collection unit is connected to the voltage transformer T2-1 and is used to collect the voltage UT2-1; The voltage collection unit is connected to the voltage transformer T2-2 and is used to collect the voltage UT2-3; The voltage collection unit is connected to the voltage transformer F2-1 and is used to collect the voltage UF2-1; The voltage collection unit is connected to the voltage transformer F2-2 and is used to collect the voltage UF2-2; The voltage determination unit is connected to the voltage acquisition unit and is used to determine whether voltage transformer T1-1, voltage transformer T1-2, voltage transformer F1-1, voltage transformer F1-2, voltage transformer T2-1, voltage transformer T2-2, voltage transformer F2-1 and voltage transformer F2-2 are under voltage; The no-voltage determination unit is connected to the voltage acquisition unit and is used to determine whether the voltage transformer T1-1, the voltage transformer T1-2, the voltage transformer F1-1, the voltage transformer F1-2, the voltage transformer T2-1, the voltage transformer T2-2, the voltage transformer F2-1 and the voltage transformer F2-2 are no-voltage; The output ends of the voltage determination unit and the no-voltage determination unit are connected to the switching determination unit, which is used to determine whether to connect the voltage transformer T1-1 or the voltage transformer T1-2; the voltage transformer F1-1 or the voltage transformer F1-2; the voltage transformer T2-1 or the voltage transformer T2-2; the voltage transformer F2-1 or the voltage transformer F2-2.

4. The 27.5 kV voltage merging intelligent device for traction substation according to claim 3 is characterized in that: The voltage determination unit comprises: a first protection signal collector, a first comparator, a first OR gate, and a first delay device; the first protection signal collector is used to collect the "open electrical quantity protection" signal; For the voltage transformer j on the i-phase bus, i=T1, F1, T2, F2; j=T1-1, T1-2, F1-1, F1-2, T2-1, T2-2, F2-1, F2-21; when the voltage transformer j on the i-phase bus is started with voltage, the voltage Uj collected by the voltage acquisition unit is connected to the positive input terminal of the first comparator, the voltage switching voltage value is connected to the negative input terminal of the first comparator, and the output terminal of the first comparator is connected to the first input terminal of the first OR gate; the first protection signal collector is connected to the second input terminal of the first OR gate; the output terminal of the first OR gate is connected to the first delay device and then outputs "the voltage transformer j on the i-phase bus has voltage".

5. The 27.5 kV voltage merging intelligent device for traction substation according to claim 3 is characterized in that: The no-voltage determination unit includes: a second protection signal collector, a second comparator, a second OR gate, and a second delay device; the second protection signal collector is used to collect the "open electrical quantity protection" signal; For the voltage transformer j on the i-phase bus, i=T1, F1, T2, F2; j=T1-1, T1-2, F1-1, F1-2, T2-1, T2-2, F2-1, F2-21; when the voltage transformer j on the i-phase bus is started without voltage, the voltage Uj collected by the voltage acquisition unit is connected to the positive input terminal of the second comparator, the voltage switching pressure value is connected to the negative input terminal of the second comparator, and the output terminal of the second comparator is connected to the first input terminal of the second OR gate; the second protection signal collector is connected to the second input terminal of the second OR gate; the output terminal of the second OR gate is connected to the second delay device and then outputs "there is no voltage on the voltage transformer j on the i-phase bus".

6. The 27.5 kV voltage merging intelligent device for traction substation according to claim 5 is characterized in that: Each phase bus is matched with a switching determination unit, and the switching determination unit includes a first switching determination unit, a second switching determination unit and a switching unit; The first switching determination unit includes: a first quantile signal collector, a second quantile signal collector, a first AND gate, a second AND gate and a third OR gate; the first quantile signal collector is used to collect the "bus coupler separation quantile 1 is 1" signal, and the second quantile signal collector is used to collect the "bus coupler separation quantile 2 is 1" signal; For the voltage transformer j1 and the voltage transformer j2 on the i-phase bus, the output end of the no-voltage determination unit that outputs "there is no voltage on the voltage transformer j1 on the i-phase bus" is connected to the first input end of the first AND gate; the output end of the no-voltage determination unit that outputs "there is no voltage on the voltage transformer j2 on the i-phase bus" is connected to the second input end of the first AND gate; the output end of the first AND gate is connected to the first input end of the third OR gate; the output end of the first quantile signal collector is connected to the first input end of the second AND gate, the output end of the second quantile signal collector is inverted and connected to the second input end of the second AND gate, the output end of the second AND gate is connected to the second input end of the third OR gate, and the output end of the third OR gate outputs "the i-phase bus voltage is switched to voltage transformer j2".

7. The 27.5 kV voltage merging intelligent device for traction substation according to claim 6 is characterized in that: The second switching determination unit includes: a third AND gate, a fourth AND gate and a fourth OR gate; For the voltage transformer j1 and the voltage transformer j2 on the i-phase bus, the output end of the no-voltage determination unit that outputs "there is no voltage on the voltage transformer j2 on the i-phase bus" is connected to the first input end of the third AND gate; the output end of the no-voltage determination unit that outputs "there is no voltage on the voltage transformer j1 on the i-phase bus" is connected to the second input end of the third AND gate; the output end of the third AND gate is connected to the first input end of the fourth OR gate; the output end of the first quantile signal collector is inverted and connected to the first input end of the fourth AND gate, the output end of the second quantile signal collector is connected to the second input end of the fourth AND gate, the output end of the fourth AND gate is connected to the second input end of the fourth OR gate, and the output end of the fourth OR gate outputs "the i-phase bus voltage is switched to the voltage transformer j1".

8. The 27.5 kV voltage merging intelligent device for traction substation according to claim 7 is characterized in that: The switching unit comprises: a first two-choose-one switch and a second two-choose-one switch; The output end of the fourth OR gate is connected to the third input end of the first two-select-one switch, the second input end of the first two-select-one switch is set to a low level, and the first input end of the first two-select-one switch is connected to the output end of the second two-select-one switch; The output end of the first two-select-one switch is connected to the first input end of the second two-select-one switch, the second input end of the second two-select-one switch is set to a high level, and the output end of the third OR gate is connected to the third input end of the second two-select-one switch.

9. The 27.5kV voltage merging intelligent system for traction substation is characterized by: It comprises the 27.5kV voltage merging intelligent device for traction substation as described in any one of claims 1-8.

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