Interface module of electronic voltage transformer

Abstract

The utility model discloses an electronic voltage transformer interface module, which relates to the technical field of primary and secondary fusion pole-mounted circuit breakers and comprises a primary side signal transmission interface circuit, a voltage division circuit and a secondary side signal transmission interface circuit. Wherein the primary side signal transmission interface circuit is electrically connected with the voltage division circuit, and the voltage division circuit is electrically connected with the secondary side signal transmission interface circuit. The electronic voltage transformer interface module has the advantages of being environmentally friendly, safe and free of daily maintenance, the problem that the voltage is unstable and cannot be adjusted due to resonance is solved, and the electronic voltage transformer interface module is simple in structure, few in parts and electronic elements, high in reliability and suitable for popularization and application. And a signal output by the secondary side can be adjusted according to the current operation environment, so as to adapt to the trend of digitization, microcomputerization and automation development of electric power measurement and protection.

Description

Technical Field

[0001] The utility model relates to the technical field of primary-secondary integrated pole-mounted circuit breakers, and specifically, to an electronic voltage transformer interface module. Background Technique

[0002] A voltage transformer is one of the basic measuring devices for electric energy metering and relay protection in the power system, and its accuracy and reliability are closely related to the safe, reliable and economic operation of the power system. With the continuous increase of power transmission capacity and the continuous improvement of grid voltage level, the traditional capacitive voltage transformer can no longer meet the development requirements of power system automation and digitization; due to process problems, the technology of optical voltage transformers is not yet mature.

[0003] At present, traditional electronic voltage transformers have the disadvantages of complex insulation structure, narrow dynamic range, easy to cause ferromagnetic resonance, large volume and the output signal is vulnerable to electromagnetic interference, etc., and it is difficult to meet the development needs of power system networking, digitization and intelligence.

[0004] In view of the problems in the related technology, no effective solution has been proposed yet. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the utility model provides an electronic voltage transformer interface module, which has the advantages of stability, environmental protection, safety and exemption from daily maintenance, and further avoids the problem that the voltage cannot be adjusted due to voltage instability caused by resonance.

[0007] (2) Technical Solutions

[0008] To achieve the above advantages of stability, environmental protection, safety and exemption from daily maintenance, the specific technical solutions adopted by the utility model are as follows:

[0009] An electronic voltage transformer interface module, which includes a primary-side signal transmission interface circuit, a voltage division circuit and a secondary-side signal transmission interface circuit;

[0010] Among them, the primary-side signal transmission interface circuit is electrically connected to the voltage division circuit, and the voltage division circuit is electrically connected to the secondary-side signal transmission interface circuit.

[0011] Further, the primary-side signal transmission interface circuit includes a primary-side signal transmission interface J1;

[0012] Among them, the tenth pin of the primary - side signal transmission interface J1 is the A - phase voltage signal on the incoming line side of the primary - secondary integrated pole - mounted circuit breaker, the ninth pin of the primary - side signal transmission interface J1 is the B - phase voltage signal on the incoming line side of the primary - secondary integrated pole - mounted circuit breaker, the eighth pin of the primary - side signal transmission interface J1 is the C - phase voltage signal on the incoming line side of the primary - secondary integrated pole - mounted circuit breaker, the seventh pin of the primary - side signal transmission interface J1 is the N - pole, the sixth and fifth pins of the primary - side signal transmission interface J1 are both ground - wire terminal ports E, the fourth pin of the primary - side signal transmission interface J1 is the a - phase voltage signal on the outgoing line side of the primary - secondary integrated pole - mounted circuit breaker, the third pin of the primary - side signal transmission interface J1 is the b - phase voltage signal on the outgoing line side of the primary - secondary integrated pole - mounted circuit breaker, the second pin of the primary - side signal transmission interface J1 is the C - phase voltage signal on the outgoing line side of the primary - secondary integrated pole - mounted circuit breaker, and the first pin of the primary - side signal transmission interface J1 is the n - pole.

[0013] Further, the secondary - side signal transmission interface circuit includes a secondary - side signal transmission interface J2 and a resistor R1;

[0014] The first pin of the secondary - side signal transmission interface J2 is the output signal UA on the incoming line side, the second pin of the secondary - side signal transmission interface J2 is the output signal UB on the incoming line side, the third pin of the secondary - side signal transmission interface J2 is the output signal UC on the incoming line side, the fourth pin of the secondary - side signal transmission interface J2 is the output signal U0 on the incoming line side, the fifth pin of the secondary - side signal transmission interface J2 is the output signal U0COM on the incoming line side, the sixth pin of the secondary - side signal transmission interface J2 is the output signal ua on the outgoing line side, the seventh pin of the secondary - side signal transmission interface J2 is the output signal ub on the outgoing line side, the eighth pin of the secondary - side signal transmission interface J2 is the output signal uc on the outgoing line side, the ninth pin of the secondary - side signal transmission interface J2 is the output signal uo on the outgoing line side, and the tenth pin of the secondary - side signal transmission interface J2 is the output signal uocom on the outgoing line side.

[0015] Further, the voltage - dividing circuit includes a first voltage - dividing circuit and a second voltage - dividing circuit, and the first voltage - dividing circuit is electrically connected to the second voltage - dividing circuit.

[0016] Further, the first voltage - dividing circuit includes switches SW1, SW2, SW3, capacitors C1, C2, C3, C4, C5, C6, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, isolation transformers T1, T2, and T3;

[0017] Among them, the first to fifth pins of the switch SW1 are connected in parallel and connected to one end of the capacitor C6, the second pin of the isolation transformer T1, and the A-phase voltage signal on the incoming line side of the primary-secondary integrated pole-mounted circuit breaker. The sixth to tenth pins of the switch SW1 are respectively connected to one end of the capacitor C1, one end of the capacitor C2, one end of the capacitor C3, one end of the capacitor C4, and one end of the capacitor C5. The other end of the capacitor C1 is respectively connected to the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5, the other end of the capacitor C6, the first pin of the isolation transformer T1 and grounded, and the third pin of the isolation transformer T1 is grounded;

[0018] The first to fifth pins of the switch SW2 are connected in parallel and connected to one end of the capacitor C12, the second pin of the isolation transformer T2, and the B-phase voltage signal on the incoming line side of the primary-secondary integrated pole-mounted circuit breaker. The sixth to tenth pins of the switch SW2 are respectively connected to one end of the capacitor C7, one end of the capacitor C8, one end of the capacitor C9, one end of the capacitor C10, and one end of the capacitor C11. The other end of the capacitor C7 is respectively connected to the other end of the capacitor C8, the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C11, the other end of the capacitor C12, the first pin of the isolation transformer T2 and grounded, and the third pin of the isolation transformer T2 is grounded;

[0019] The first to fifth pins of the switch SW3 are connected in parallel and connected to one end of the capacitor C18, the second pin of the isolation transformer T3, and the C-phase voltage signal on the incoming line side of the primary-secondary integrated pole-mounted circuit breaker. The sixth to tenth pins of the switch SW3 are respectively connected to one end of the capacitor C13, one end of the capacitor C14, one end of the capacitor C15, one end of the capacitor C16, and one end of the capacitor C17. The other end of the capacitor C13 is respectively connected to the other end of the capacitor C14, the other end of the capacitor C15, the other end of the capacitor C16, the other end of the capacitor C17, the other end of the capacitor C18, the first pin of the isolation transformer T3 and grounded, and the third pin of the isolation transformer T3 is grounded;

[0020] The fourth pin of the isolation transformer T1 is connected to the output signal UA on the incoming line side. The fifth pin of the isolation transformer T1 is respectively connected to the fifth pin of the isolation transformer T2, the fifth pin of the isolation transformer T3, the seventh pin of the isolation transformer T3, and the output signal U0COM on the incoming line side. The sixth pin of the isolation transformer T1 is connected to the output signal U0 on the incoming line side. The seventh pin of the isolation transformer T1 is connected to the sixth pin of the isolation transformer T2. The fourth pin of the isolation transformer T2 is connected to the output signal UB on the incoming line side. The seventh pin of the isolation transformer T2 is connected to the sixth pin of the isolation transformer T3. The fourth pin of the isolation transformer T2 is connected to the output signal UC on the incoming line side.

[0021] Further, the resistor R1 is used to short-circuit and share the incoming and outgoing sides of the signal output; the resistor R1 is 0 Ω.

[0022] Further, the capacitors C1, C7 and C13 are all 1 nF; the capacitors C2, C8 and C14 are all 2 nF; the capacitors C3, C9 and C15 are all 4 nF; the capacitors C4, C10 and C16 are all 8 nF; the capacitors C5, C11 and C17 are all 16 nF; the capacitors C6, C12 and C18 are all 310 nF.

[0023] (III) Beneficial Effects

[0024] Compared with the prior art, the present utility model provides an electronic voltage transformer interface module, which has the following beneficial effects: The electronic voltage transformer interface module provided by the present utility model has the advantages of environmental protection, safety and daily maintenance-free, avoiding the problem that the voltage cannot be adjusted due to voltage instability caused by resonance. Moreover, the electronic voltage transformer interface module has a simple structure, few components and electronic elements, high reliability, and can adjust the signal output on the secondary side according to the operating environment at that time, thus adapting to the trend of the digitalization, microcomputerization and automation development of power metering and protection. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is the principle block diagram of the electronic voltage transformer interface module according to the embodiment of the present utility model;

[0027] Figure 2 is the circuit diagram of the primary side signal transmission interface circuit in the electronic voltage transformer interface module according to the embodiment of the present utility model;

[0028] Figure 3 is the circuit diagram of the first voltage division circuit in the electronic voltage transformer interface module according to the embodiment of the present utility model;

[0029] Figure 4 is the circuit diagram of the second voltage division circuit in the electronic voltage transformer interface module according to the embodiment of the present utility model;

[0030] Figure 5 is the circuit diagram of the secondary side signal transmission interface circuit in the electronic voltage transformer interface module according to the embodiment of the present utility model.

[0031] In the figure:

[0032] 1. Primary side signal transmission interface circuit; 2. Voltage division circuit; 3. Secondary side signal transmission interface circuit. Specific embodiments

[0033] To further illustrate each embodiment, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be combined with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0034] According to an embodiment of the present invention, an electronic voltage transformer interface module is provided.

[0035] Now, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments. As Figure 1 shown, the electronic voltage transformer interface module according to an embodiment of the present invention includes a primary side signal transmission interface circuit 1, a voltage division circuit 2, and a secondary side signal transmission interface circuit 3; the primary side signal transmission interface circuit 1 is electrically connected to the voltage division circuit 2, and the voltage division circuit 2 is electrically connected to the secondary side signal transmission interface circuit 3.

[0036] Among them, the primary side signal transmission interface circuit 1 includes a primary side signal transmission interface J1; the primary side signal transmission interface J1 is based on the Figure 2 shown incoming line side. The signal line is led out from the primary side of the circuit breaker on the integrated primary and secondary post insulator. The pin definitions of the primary side signal transmission interface J1 from top to bottom are as follows: the tenth pin of the primary side signal transmission interface J1 is the A-phase voltage signal of the incoming line side of the circuit breaker on the integrated primary and secondary post insulator, the ninth pin of the primary side signal transmission interface J1 is the B-phase voltage signal of the incoming line side of the circuit breaker on the integrated primary and secondary post insulator, the eighth pin of the primary side signal transmission interface J1 is the C-phase voltage signal of the incoming line side of the circuit breaker on the integrated primary and secondary post insulator, the seventh pin of the primary side signal transmission interface J1 is the N pole, the sixth and fifth pins of the primary side signal transmission interface J1 are both ground terminal ports E, the fourth pin of the primary side signal transmission interface J1 is the a-phase voltage signal of the outgoing line side of the circuit breaker on the integrated primary and secondary post insulator, the third pin of the primary side signal transmission interface J1 is the b-phase voltage signal of the outgoing line side of the circuit breaker on the integrated primary and secondary post insulator, the second pin of the primary side signal transmission interface J1 is the C-phase voltage signal of the outgoing line side of the circuit breaker on the integrated primary and secondary post insulator, and the first pin of the primary side signal transmission interface J1 is the n pole.

[0037] Among them, the secondary - side signal transmission interface circuit 3 includes a secondary - side signal transmission interface J2 and a resistor R1; the secondary - side signal transmission interface J2 is based on Figure 5 the outgoing line side shown. The signal transmitted from the primary signal passes through the voltage - dividing circuit 2 and then reaches the secondary signal. The signals led out from each pin of the secondary - side signal transmission interface J2 include: the first pin of the secondary - side signal transmission interface J2 is the output signal UA of the incoming line side, the second pin of the secondary - side signal transmission interface J2 is the output signal UB of the incoming line side, the third pin of the secondary - side signal transmission interface J2 is the output signal UC of the incoming line side, the fourth pin of the secondary - side signal transmission interface J2 is the output signal U0 of the incoming line side, the fifth pin of the secondary - side signal transmission interface J2 is the output signal U0COM of the incoming line side, the sixth pin of the secondary - side signal transmission interface J2 is the output signal ua of the outgoing line side, the seventh pin of the secondary - side signal transmission interface J2 is the output signal ub of the outgoing line side, the eighth pin of the secondary - side signal transmission interface J2 is the output signal uc of the outgoing line side, the ninth pin of the secondary - side signal transmission interface J2 is the output signal uo of the outgoing line side, and the tenth pin of the secondary - side signal transmission interface J2 is the output signal uocom of the outgoing line side; among them, the 0Ω resistor R1 is used to short - circuit and share the incoming and outgoing line sides of the signal output. When two - way output is not required, the 0Ω resistor R1 can be removed according to the actual situation.

[0038] Among them, the voltage - dividing circuit 2 includes a first voltage - dividing circuit and a second voltage - dividing circuit, and the first voltage - dividing circuit is electrically connected to the second voltage - dividing circuit, as Figure 3 shown. The first voltage - dividing circuit includes switches SW1, SW2, SW3, capacitors C1, C2, C3, C4, C5, C6, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, isolation transformers T1, T2, and T3; among them, the first to fifth pins of the switch SW1 are connected in parallel and connected to one end of the capacitor C6, the second pin of the isolation transformer T1, and the A - phase voltage signal on the incoming line side of the breaker at the primary - secondary fusion column. The sixth to tenth pins of the switch SW1 are respectively connected to one ends of the capacitors C1, C2, C3, C4, and C5. The other end of the capacitor C1 is respectively connected to the other ends of the capacitors C2, C3, C4, C5, C6, the first pin of the isolation transformer T1 and grounded. The third pin of the isolation transformer T1 is grounded;

[0039] The first to fifth pins of switch SW2 are connected in parallel and are connected to one end of capacitor C12, the second pin of isolation transformer T2, and the B-phase voltage signal on the incoming line side of the primary-secondary integrated pole-mounted circuit breaker. The sixth to tenth pins of switch SW2 are respectively connected to one end of capacitor C7, one end of capacitor C8, one end of capacitor C9, one end of capacitor C10, and one end of capacitor C11. The other end of capacitor C7 is respectively connected to the other ends of capacitor C8, capacitor C9, capacitor C10, capacitor C11, the other end of capacitor C12, and the first pin of isolation transformer T2 and is grounded. The third pin of isolation transformer T2 is grounded;

[0040] The first to fifth pins of switch SW3 are connected in parallel and are connected to one end of capacitor C18, the second pin of isolation transformer T3, and the C-phase voltage signal on the incoming line side of the primary-secondary integrated pole-mounted circuit breaker. The sixth to tenth pins of switch SW3 are respectively connected to one end of capacitor C13, one end of capacitor C14, one end of capacitor C15, one end of capacitor C16, and one end of capacitor C17. The other end of capacitor C13 is respectively connected to the other ends of capacitor C14, capacitor C15, capacitor C16, capacitor C17, the other end of capacitor C18, and the first pin of isolation transformer T3 and is grounded. The third pin of isolation transformer T3 is grounded;

[0041] The fourth pin of isolation transformer T1 is connected to the output signal UA on the incoming line side. The fifth pin of isolation transformer T1 is respectively connected to the fifth pin of isolation transformer T2, the fifth pin of isolation transformer T3, the seventh pin of isolation transformer T3, and the output signal U0COM on the incoming line side. The sixth pin of isolation transformer T1 is connected to the output signal U0 on the incoming line side. The seventh pin of isolation transformer T1 is connected to the sixth pin of isolation transformer T2. The fourth pin of isolation transformer T2 is connected to the output signal UB on the incoming line side. The seventh pin of isolation transformer T2 is connected to the sixth pin of isolation transformer T3. The fourth pin of isolation transformer T2 is connected to the output signal UC on the incoming line side.

[0042] It should be noted that as Figure 4As shown, the second voltage dividing circuit is similar in structure to the first voltage dividing circuit. The connection of the second voltage dividing circuit will not be elaborated too much. Among them, capacitor C1, capacitor C7, capacitor C13, C19, C25, and C31 are all 1 nF; capacitor C2, capacitor C8, capacitor C14, capacitor C20, capacitor C26, and capacitor C32 are all 2 nF; capacitor C3, capacitor C9, capacitor C15, capacitor C21, capacitor C27, and capacitor C33 are all 4 nF; capacitor C4, capacitor C10, capacitor C16, capacitor C22, capacitor 28, and capacitor 34 are all 8 nF; capacitor C5, capacitor C11, capacitor C17, capacitor C23, capacitor C29, and capacitor C35 are all 16 nF; capacitor C6, capacitor C12, capacitor C18, capacitor C24, capacitor C30, and capacitor C36 are all 310 nF.

[0043] It should be noted that the voltage signal transmitted is adjusted by using capacitors of 1 nF, 2 nF, 4 nF, 8 nF, 16 nF, 310 nF and an isolation voltage transformer, and the capacitor models used are calculated through the conversion ratio of voltage to capacitive reactance. If the phase voltage on the secondary side is 1.876 V after passing through the phase voltage of 5774 V on the primary side, and it is known that the capacitor used on the primary side is 230 pF ± 10%, according to the ratio of 5774 V to 1.876 V and the capacitive reactance calculation formula: Z = 1 / jwC, a capacitor of 340 nF in the secondary voltage dividing circuit is required for the primary side's 230 pF ± 10% capacitor to obtain a theoretically 1.876 V voltage.

[0044] To facilitate the understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in the actual process will be described in detail below.

[0045] In actual application, taking the A-phase voltage signal on the incoming line side of a primary-secondary integrated pole-mounted circuit breaker as an example, when the primary-secondary integrated circuit breaker passes through the phase voltage of 5774 V, it is transmitted to the primary-side signal transmission interface J1 of the electronic voltage transformer interface module through the signal line inside the primary-secondary integrated circuit breaker. After passing through the voltage dividing circuit 2 (secondary voltage dividing circuit), there is a 5P DIP switch in the voltage dividing circuit 2. From right to left, there are capacitor adjustment switches of 1 nF, 2 nF, 4 nF, 8 nF, and 16 nF, so that real-time adjustment can be made according to the actual environment. After stabilizing the output signal to 1.876 V, the signal is transmitted to the secondary-side signal transmission interface J2. At this time, it can cooperate with the FTU (feeder terminal unit) for primary-secondary integration debugging.

[0046] In summary, by means of the above technical solutions of the present utility model, the electronic voltage transformer interface module provided by the present utility model has the advantages of environmental protection, safety and daily maintenance-free, avoiding the problem that the voltage cannot be adjusted due to resonance-caused voltage instability. Moreover, the electronic voltage transformer interface module has a simple structure, few components and electronic elements, high reliability, and can adjust the signal output on the secondary side according to the operating environment at that time, thus adapting to the trend of the digitalization, microcomputerization and automation development of power metering and protection.

[0047] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection" and the like shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0048] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electronic voltage transformer interface module, characterized in that, The electronic voltage transformer interface module includes a primary side signal transmission interface circuit, a voltage division circuit, and a secondary side signal transmission interface circuit; Among them, the primary side signal transmission interface circuit is electrically connected to the voltage division circuit, and the voltage division circuit is electrically connected to the secondary side signal transmission interface circuit.

2. The electronic voltage transformer interface module according to claim 1, characterized in that The primary side signal transmission interface circuit includes a primary side signal transmission interface J1; Among them, the tenth pin of the primary side signal transmission interface J1 is the A-phase voltage signal on the incoming line side of the integrated primary and secondary pole-mounted circuit breaker, the ninth pin of the primary side signal transmission interface J1 is the B-phase voltage signal on the incoming line side of the integrated primary and secondary pole-mounted circuit breaker, the eighth pin of the primary side signal transmission interface J1 is the C-phase voltage signal on the incoming line side of the integrated primary and secondary pole-mounted circuit breaker, the seventh pin of the primary side signal transmission interface J1 is the N pole, the sixth and fifth pins of the primary side signal transmission interface J1 are both ground terminal ports E, the fourth pin of the primary side signal transmission interface J1 is the a-phase voltage signal on the outgoing line side of the integrated primary and secondary pole-mounted circuit breaker, the third pin of the primary side signal transmission interface J1 is the b-phase voltage signal on the outgoing line side of the integrated primary and secondary pole-mounted circuit breaker, the second pin of the primary side signal transmission interface J1 is the C-phase voltage signal on the outgoing line side of the integrated primary and secondary pole-mounted circuit breaker, and the first pin of the primary side signal transmission interface J1 is the n pole.

3. The electronic voltage transformer interface module according to claim 2, wherein The secondary side signal transmission interface circuit includes a secondary side signal transmission interface J2 and a resistor R1; The first pin of the secondary side signal transmission interface J2 is the output signal UA on the incoming line side, the second pin of the secondary side signal transmission interface J2 is the output signal UB on the incoming line side, the third pin of the secondary side signal transmission interface J2 is the output signal UC on the incoming line side, the fourth pin of the secondary side signal transmission interface J2 is the output signal U0 on the incoming line side, the fifth pin of the secondary side signal transmission interface J2 is the output signal U0COM on the incoming line side, the sixth pin of the secondary side signal transmission interface J2 is the output signal ua on the outgoing line side, the seventh pin of the secondary side signal transmission interface J2 is the output signal ub on the outgoing line side, the eighth pin of the secondary side signal transmission interface J2 is the output signal uc on the outgoing line side, the ninth pin of the secondary side signal transmission interface J2 is the output signal uo on the outgoing line side, and the tenth pin of the secondary side signal transmission interface J2 is the output signal uocom on the outgoing line side.

4. An electronic voltage transformer interface module according to claim 3, characterized in that, The voltage division circuit includes a first voltage division circuit and a second voltage division circuit, and the first voltage division circuit is electrically connected to the second voltage division circuit.

5. An electronic voltage transformer interface module according to claim 4, characterized in that The first voltage division circuit includes switches SW1, SW2, SW3, capacitors C1, C2, C3, C4, C5, C6, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, isolation transformers T1, T2, and T3; Among them, the first to fifth pins of the switch SW1 are connected in parallel and connected to one end of the capacitor C6, the second pin of the isolation transformer T1, and the A-phase voltage signal on the incoming line side of the breaker on the primary-secondary integrated post. The sixth to tenth pins of the switch SW1 are respectively connected to one end of the capacitor C1, one end of the capacitor C2, one end of the capacitor C3, one end of the capacitor C4, and one end of the capacitor C5. The other end of the capacitor C1 is respectively connected to the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5, the other end of the capacitor C6, the first pin of the isolation transformer T1 and grounded, and the third pin of the isolation transformer T1 is grounded; The first to fifth pins of the switch SW2 are connected in parallel and connected to one end of the capacitor C12, the second pin of the isolation transformer T2, and the B-phase voltage signal on the incoming line side of the breaker on the primary-secondary integrated post. The sixth to tenth pins of the switch SW2 are respectively connected to one end of the capacitor C7, one end of the capacitor C8, one end of the capacitor C9, one end of the capacitor C10, and one end of the capacitor C11. The other end of the capacitor C7 is respectively connected to the other end of the capacitor C8, the other end of the capacitor C9, the other end of the capacitor C10, the other end of the capacitor C11, the other end of the capacitor C12, the first pin of the isolation transformer T2 and grounded, and the third pin of the isolation transformer T2 is grounded; The first to fifth pins of the switch SW3 are connected in parallel and connected to one end of the capacitor C18, the second pin of the isolation transformer T3, and the C-phase voltage signal on the incoming line side of the breaker on the primary-secondary integrated post. The sixth to tenth pins of the switch SW3 are respectively connected to one end of the capacitor C13, one end of the capacitor C14, one end of the capacitor C15, one end of the capacitor C16, and one end of the capacitor C17. The other end of the capacitor C13 is respectively connected to the other end of the capacitor C14, the other end of the capacitor C15, the other end of the capacitor C16, the other end of the capacitor C17, the other end of the capacitor C18, the first pin of the isolation transformer T3 and grounded, and the third pin of the isolation transformer T3 is grounded; The fourth pin of the isolation transformer T1 is connected to the output signal UA on the incoming line side. The fifth pin of the isolation transformer T1 is respectively connected to the fifth pin of the isolation transformer T2, the fifth pin of the isolation transformer T3, the seventh pin of the isolation transformer T3, and the output signal U0COM on the incoming line side. The sixth pin of the isolation transformer T1 is connected to the output signal U0 on the incoming line side. The seventh pin of the isolation transformer T1 is connected to the sixth pin of the isolation transformer T2. The fourth pin of the isolation transformer T2 is connected to the output signal UB on the incoming line side. The seventh pin of the isolation transformer T2 is connected to the sixth pin of the isolation transformer T3. The fourth pin of the isolation transformer T2 is connected to the output signal UC on the incoming line side.

6. The electronic voltage transformer interface module according to claim 5, characterized in that, The resistor R1 is used to short-circuit and share the incoming line side and the outgoing line side of the signal output; the resistor R1 is 0Ω.

7. An electronic voltage transformer interface module according to claim 6, characterized in that, The capacitors C1, C7, and C13 are all 1nF; the capacitors C2, C8, and C14 are all 2nF; the capacitors C3, C9, and C15 are all 4nF; the capacitors C4, C10, and C16 are all 8nF; the capacitors C5, C11, and C17 are all 16nF; the capacitors C6, C12, and C18 are all 310nF.

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