A medium-voltage distribution panel time relay calibration circuit, system and method

Abstract

The present invention relates to the technical field of nuclear power electrical control circuits, and discloses a time relay calibration circuit for a medium-voltage distribution panel, which is used to calibrate the delay signal of a time relay assembly. The circuit includes a first switch circuit and a second switch circuit for controlling the demagnetization or magnetization of the time relay coil in the time relay assembly, and further includes a first response circuit for reflecting the delay contact signal in the time relay assembly. A contact connected to the stop port group of the time table is provided in the first response circuit, and the start port group of the time table is arranged in the second response circuit. The present invention also discloses a time relay calibration system and a calibration method for a medium-voltage distribution panel. The present invention adopts a new calibration principle, which can achieve calibration without distinguishing specific models, the calibration process is completely consistent, simplifies the operation process, and eliminates the need for frequent gear shifting.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power electrical control circuits, and particularly to a time relay calibration circuit, system and method for a medium voltage distribution panel. Background Art

[0002] In various power stations and large factories, a 6.6KV medium voltage distribution panel is usually used to achieve power generation, transmission, distribution and power conversion, and is used to control 10KV incoming lines and 10KV / 0.4KV transformers, and control 6.6KV large-capacity motors, etc. As an important part of the power distribution system, the reliable operation of the medium voltage distribution panel is particularly important. For different situations, it is necessary to clarify the action time, so the participation of a time relay is required. To ensure the reliability of the medium voltage distribution panel, it is necessary to regularly calibrate the time relay to ensure that various signals can be triggered and output in accordance with the established sequence.

[0003] In a nuclear power plant, the time relay of the medium voltage distribution panel participates in the closing logic of the medium voltage contactor to play a role in signal transition, ensuring that electrical signals can be transmitted in accordance with the established sequence of logic. In the factory design, the time relay and its associated relays are installed on the circuit board, and terminals are led out from the circuit board for external connection. Due to design requirements, the time relay is of the power-off delay type and has a short action time, about 400ms. To ensure the accuracy of the calibration data, it is only possible to unplug the relay for off-line calibration or connect signals at the wiring terminals of the circuit board. In terms of on-site maintenance, the secondary compartment of the medium voltage contactor panel is narrow and located at a high position, making it inconvenient to operate and unable to conduct intuitive visual inspections. During the calibration process, it is easy to damage the relay or cause discharge short-circuit accidents due to wiring lap or wiring errors. To avoid various possible problems, it is necessary to design a time relay calibration device that does not frequently disassemble the relay and does not connect signals on the circuit board. Summary of the Invention

[0004] The present invention provides a time relay calibration circuit, system and method for a medium voltage distribution panel, which completely gets rid of problems such as incorrect wiring, accidental detachment of normal wiring, and inconvenient operation that may be caused by wiring at the relay base; there is no need to distinguish the equipment model in advance, and the completely same operation method reduces the operation difficulty and greatly improves the reliability of the equipment; there is no longer a need to use ladders and conduct wiring, review, inspection, etc. in a narrow space, reducing the labor input and further shortening the time required for calibration.

[0005] The present invention is achieved by the following technical solutions:

[0006] The present invention discloses a verification circuit for a medium-voltage distribution panel time relay, which is used to verify the delay signal of the time relay assembly. It includes a first switch circuit and a second switch circuit for controlling the demagnetization or magnetization of the time relay coil in the time relay assembly, and further includes a first response circuit for reflecting the delay contact signal in the time relay assembly. A contact connected to the stop port group of the time table is provided in the first response circuit, and the start port group of the time table is arranged in the second response circuit. It also includes a third intermediate coil KA3-0 of a first control circuit, a second control circuit and a third intermediate relay connected in parallel. A first intermediate coil KA1-0 of a first intermediate relay is provided in the first control circuit, and a second intermediate coil KA2-0 of a second intermediate relay is provided in the second control circuit. The first intermediate coil KA1-0, the second intermediate coil KA2-0 and the third intermediate coil KA3-0 respectively control the opening and closing of the corresponding contacts in the first switch circuit, the second switch circuit, the first response circuit and the second response circuit. The first control circuit, the second control circuit and the third intermediate coil KA3-0 are connected to the positive pole of the first input power supply through a universal switch, the other end of the third intermediate coil KA3-0 is connected to the negative pole of the first input power supply, and the output end of the time relay assembly is connected to the negative pole of the first input power supply.

[0007] As an optimization, the first control circuit includes a second push-button switch SB2 and a first intermediate coil KA1-0 of a first intermediate relay connected in series. The second control circuit includes a third push-button switch SB3 and a second intermediate coil KA2-0 of a second intermediate relay connected in series. One end of the second push-button switch SB2 far from the first intermediate coil KA1-0 and one end of the third push-button switch SB3 far from the second intermediate coil KA2-0 are connected to one end of a universal switch SA. The other end of the universal switch SA is connected to the positive pole of the first input power supply. One end of the first intermediate coil KA1-0 far from the second push-button switch SB2 and one end of the second intermediate coil KA2-0 far from the third push-button switch SB3 are connected to the negative pole of the first input power supply.

[0008] As an optimization, the universal switch includes three gears, namely a first gear SA-1, a second gear SA-2 and a third gear SA-3. The first gear SA-1 is arranged in the first control circuit. The second gear SA-2 is respectively arranged in the second control circuit and in series with the third intermediate coil KA3-0. The third gear SA-3 is in a neutral gear, and all contacts of the third gear SA-3 are in an open state and are used as the initial gear for verification.

[0009] As an optimization, the first switch circuit includes the first normally-closed contact KA3-1 of the third intermediate relay and the second normally-closed contact KA1-2 of the first intermediate relay, which are arranged in series. The second switch circuit includes the third normally-open contact KA3-3 of the third intermediate relay and the fourth normally-closed contact KA2-4 of the second intermediate relay, which are arranged in series. One end of the second normally-closed contact KA1-2 away from the first normally-closed contact KA3-1 is connected to one end of the fourth normally-closed contact KA2-4 away from the third normally-open contact KA3-3. One end of the second normally-closed contact KA1-2 away from the first normally-closed contact KA3-1 and one end of the fourth normally-closed contact KA2-4 away from the third normally-open contact KA3-3 are connected to the input end of the time relay assembly. The output end of the time relay assembly is connected to the negative pole of the first input power supply.

[0010] As an optimization, the first response circuit includes a voltage-dividing resistor R, the fifth normally-closed contact KA3-5 of the third intermediate relay, the sixth normally-open contact KA2-6 of the second intermediate relay, the seventh normally-open contact KA3-7 of the third intermediate relay, and the eighth normally-closed contact KA2-8 of the second intermediate relay. Among them, the fifth normally-closed contact KA3-5 and the sixth normally-open contact KA2-6 are arranged in parallel to form a first parallel link. One end of the first parallel link is connected to the fourth port H4 of the time table. One end of the voltage-dividing resistor R is connected to the third port H3 of the time table. The seventh normally-open contact KA3-7 and the eighth normally-closed contact KA2-8 are arranged in series. One end of the eighth normally-closed contact KA2-8 away from the seventh normally-open contact KA3-7 is connected to the other end of the first parallel link.

[0011] As an optimization, the second response circuit includes the ninth normally-closed contact KA3-9 of the third intermediate relay and the tenth normally-closed contact KA1-10 of the first intermediate relay, which are arranged in series to form a first series link, and the eleventh normally-open contact KA3-11 of the third intermediate relay and the twelfth normally-closed contact KA2-12 of the second intermediate relay, which are arranged in series to form a second series link. The first series link and the second series link are arranged in parallel. The two ends of the first series link are respectively connected to the first port H1 and the second port H2 of the time table.

[0012] The present invention also discloses a medium-voltage distribution panel time relay calibration system, including the above-mentioned calibration circuit, characterized in that it further includes a medium-voltage distribution panel device, a switching power supply module, a current and voltage monitoring module, a time schedule, and a connecting male plug. The medium-voltage distribution panel device includes a distribution panel female plug and a time relay assembly. The time relay assembly includes a first time relay 001XT, a second time relay 002XT, and a peripheral circuit. The input end of the switching power supply module is connected to an external power supply through a power button SB1, and the output end of the switching power supply module is respectively connected to the calibration circuit and the current and voltage monitoring module. The current and voltage monitoring module is used to monitor the voltage of the first input power supply of the calibration circuit. The calibration circuit is sequentially connected to the time relay assembly through the connecting male plug and the distribution panel female plug. The time relay assembly receives the signal of the calibration circuit and reflects the delay information to the calibration circuit, and the calibration circuit feeds back the delay information to the time schedule.

[0013] As an optimization, it further includes a terminal block. The current and voltage monitoring module, the switching power supply module, and the connecting male plug are connected to the calibration circuit through the terminal block, and the calibration circuit is connected to the time schedule through the terminal block.

[0014] As an optimization, the time relay assembly includes an N-type time relay and a DN-type time relay;

[0015] The N-type time relay includes the fourth intermediate coil 001XP-0 of the fourth intermediate relay, the fourteenth normally closed contact 001XP-14, the fifteenth normally open contact 001XP-15, and the seventeenth normally closed contact 001XP-17. It also includes the fifth intermediate coil 001XF-0 of the fifth intermediate relay, the thirteenth normally open contact 001XF-13, the sixteenth normally closed contact 001XF-16, the eighteenth normally open contact 001XF-18, the nineteenth normally open contact 001XF-19, and the twentieth normally open contact 001XF-20. It further includes the first receiving coil 001XT-0 of the first time relay, the first delay contact 001XT-XU1, and the second delay contact 001XT-XU2. And the second receiving coil 002XT-0 and the third delay contact 002XT-XU of the second time relay; wherein the first delay contact 001XT-XU1 and the second delay contact 001XT-XU2 are triggered simultaneously; the first delay contact 001XT-XU1, the second delay contact 001XT-XU2, and the third delay contact 002XT-XU are normally closed when powered on and delay to open when powered off. The output end of the first switch circuit is connected to the negative pole of the first input power supply through a third series link composed of the sixteenth normally closed contact 001XF-16, the seventeenth normally closed contact 001XP-17, and the first receiving coil 001XT-0 connected in series in sequence; the output end of the second switch circuit is connected to the negative pole of the first input power supply by connecting the nineteenth normally open contact 001XF-19 and the second receiving coil 002XT-0 in series in sequence; the first delay contact 001XT-XU1, the third delay contact 002XT-XU, and the fifteenth normally open contact 001XP-15 are connected in parallel to form a second parallel link; one end of the fifth intermediate coil 001XF-0 is connected to the output end of the first response circuit, and at the same time, this end is connected to the output end of the first switch circuit through the fourteenth normally closed contact 001XP-14, the second delay contact 001XT-XU2, and the thirteenth normally open contact 001XF-13 connected in series in sequence, constituting another power supply path for the fifth intermediate coil 001XF-0. The other end of the fifth intermediate coil 001XF-0 is connected to the negative pole of the first input power supply by connecting the second parallel link in series. At the same time, the output end of the first switch circuit is also connected to the negative pole of the first input power supply through a fourth series link composed of the twentieth normally open contact 001XF-20, the eighteenth normally open contact 001XF-18, and the fourth intermediate coil 001XP-0 connected in series in sequence; the third series link and the fourth series link are arranged in parallel, and the fourth intermediate coil 001XP-0 and the second receiving coil 002XT-0 are arranged in parallel.

[0016] The DN-type time relay includes the fourth intermediate coil 001XP-0, the fourteenth normally closed contact 001XP-14, the seventeenth normally closed contact 001XP-17, the twentieth normally closed contact 001XP-21, and the twenty-second normally closed contact 001XP-22 of the fourth intermediate relay; it also includes the fifth intermediate coil 001XF-0, the thirteenth normally open contact 001XF-13, the sixteenth normally closed contact 001XF-16, the eighteenth normally open contact 001XF-18, the nineteenth normally open contact 001XF-19, and the twentieth normally open contact 001XF-20 of the fifth intermediate relay, and also includes the first receiving coil 001XT-0, the first delay contact 001XT-XU1, the second delay contact 001XT-XU2 of the first time relay, and the second receiving coil 002XT-0 and the third delay contact 002XT-XU of the second time relay; wherein the first delay contact 001XT-XU1 and the second delay contact 001XT-XU2 are triggered simultaneously, and the first delay contact 001XT-XU1, the second delay contact 001XT-XU2, and the third delay contact 002XT-XU are normally closed when powered on and delay open when powered off; the output end of the second switch circuit is connected to the negative pole of the first input power supply through a fifth series link composed of the sixteenth normally closed contact 001XF-16, the seventeenth normally closed contact 001XP-17, and the first receiving coil 001XT-0 connected in series in sequence; the output end of the second switch circuit is also connected to the negative pole of the first input power supply through a sixth series link composed of the twentieth normally open contact 001XF-20, the eighteenth normally open contact 001XF-18, and the fourth intermediate coil 001XP-0 connected in series; the fifth series link and the sixth series link are arranged in parallel, the second receiving coil 002XT-0 and the fourth intermediate coil 001XP-0 are arranged in parallel, and the nineteenth normally open contact 001XF-19, the twenty-first normally closed contact 001XP-21, and the twenty-second normally closed contact 001XF-22 are connected in series in sequence away from the negative pole of the first input power supply for the second receiving coil 002XT-0 to serve as an additional power supply independent of the first receiving coil 001XT-0; the first delay contact 001XT-XU1 and the third delay contact 002XT-XU are connected in parallel to form a third parallel link; the first switch circuit is connected to the negative pole of the first input power supply through the thirteenth normally open contact 001XF-13, the second delay contact 001XT-XU2, the fourteenth normally closed contact 001XP-14, the fifth intermediate coil 001XF-0, and the third parallel link connected in series in sequence; the output end of the first response circuit is arranged between the fourteenth normally closed contact 001XP-14 and the fifth intermediate coil 001XF-0.

[0017] The present invention also discloses a method for calibrating a time relay of a medium-voltage distribution panel, which uses the above-mentioned medium-voltage distribution panel time relay calibration system, and is characterized by including the following steps:

[0018] S1. Connect each module, circuit and component on the medium-voltage distribution panel time relay calibration system;

[0019] S2. Set the START mode of the time table to dry contact signal detection and disconnect the action; set the STOP mode to voltage signal detection and lose voltage action;

[0020] S3. Press the power button SB1, and confirm through the current and voltage monitoring module that the output voltage of the switching power supply module is within the specified range;

[0021] S4. Turn the universal switch to the gear of the time relay to be calibrated. At this time, the corresponding time relay is powered on;

[0022] S5. Press the push-button switch, the corresponding time relay loses power, the time table starts timing, and after the time delay of the time relay ends, the time table stops timing.

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

[0024] 1. The novel circuit design of the present invention changes the situation of wiring on the relay base circuit board. All wiring only needs to be connected at the aviation plug, completely getting rid of problems such as incorrect wiring, accidental detachment of normal wiring, and inconvenient operation that may be caused by wiring on the relay base;

[0025] 2. The present invention adopts a new calibration principle, which can be used without distinguishing specific models, and the calibration process is completely the same, simplifying the operation process and eliminating the need to frequently switch gears.

[0026] 3. The present invention no longer requires the use of ladders and wiring, verification, inspection, etc. in a narrow space, reducing the labor input and further shortening the time required for calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0028] Figure 1 is the circuit connection diagram of a medium-voltage distribution panel time relay calibration circuit according to the present invention;

[0029] Figure 2 Circuit connection diagram of the second response circuit;

[0030] Figure 3 Schematic circuit diagram of an N-type time relay;

[0031] Figure 4 Schematic circuit diagram of a DN-type time relay;

[0032] Figure 5 Module connection diagram of a medium-voltage distribution panel time relay calibration system according to the present invention;

[0033] Figure 6 Specific wiring diagram of the aviation plug, switching power supply module, and current and voltage monitoring module of a medium-voltage distribution panel time relay calibration system according to the present invention;

[0034] Figure 7 Specific wiring diagram of the terminal block and universal changeover switch;

[0035] Figure 8 Schematic diagram of the panel of the calibration device. Specific embodiments

[0036] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0037] Embodiment 1

[0038] As Figure 1-2As shown in the figure, a time relay calibration circuit for a medium-voltage distribution panel is used to calibrate the delay signal of a time relay assembly. It includes a first switch circuit and a second switch circuit for controlling the demagnetization or magnetization of the time relay coil in the time relay assembly, and also includes a first response circuit for reflecting the delay contact signal in the time relay assembly. A contact connected to the stop port group of the time table is provided in the first response circuit, and the start port group of the time table is arranged in the second response circuit. It also includes a third intermediate coil KA3-0 of a first control circuit, a second control circuit, and a third intermediate relay connected in parallel. A first intermediate coil KA1-0 of a first intermediate relay is provided in the first control circuit, and a second intermediate coil KA2-0 of a second intermediate relay is provided in the second control circuit. The first intermediate coil KA1-0, the second intermediate coil KA2-0, and the third intermediate coil KA3-0 respectively control the opening and closing of corresponding contacts in the first switch circuit, the second switch circuit, the first response circuit, and the second response circuit. The first control circuit, the second control circuit, and the third intermediate coil KA3-0 are connected to the positive pole of the first input power supply through a universal switch, and the other end of the third intermediate coil KA3-0 is connected to the negative pole of the first input power supply, and the output end of the time relay assembly is connected to the negative pole of the first input power supply. The self-locking control push-button switch selects a model with a built-in indicator light. Without increasing the number of panel openings, it is equivalent to connecting a first indicator light D1 in parallel on the first intermediate coil KA1-0 and a second indicator light D2 in parallel on the second intermediate coil KA2-0. In this way, it is possible to clearly know the energization and de-energization conditions of the first intermediate coil KA1-0 and the second intermediate coil KA2-0.

[0039] In this embodiment, the first control circuit includes a second push-button switch SB2 (for controlling the self-locking push-button switch of the 001XT time relay) and the first intermediate coil KA1-0 of the first intermediate relay connected in series. The second control circuit includes a third push-button switch SB3 (for controlling the self-locking push-button switch of the 002XT time relay) and the second intermediate coil KA2-0 of the second intermediate relay connected in series. One end of the second push-button switch SB2 far from the first intermediate coil KA1-0 and one end of the third push-button switch SB3 far from the second intermediate coil KA2-0 are connected to one end of the universal switch SA, and the other end of the universal switch SA is connected to the positive pole of the first input power supply. One end of the first intermediate coil KA1-0 far from the second push-button switch SB2 and one end of the second intermediate coil KA2-0 far from the third push-button switch SB3 are connected to the negative pole of the first input power supply.

[0040] In this embodiment, the universal changeover switch includes three gears, namely the first gear SA-1 (the corresponding contact is 3-4 of SA) and the second gear SA-2 (the corresponding contact is 1-2 of SA). The first gear SA-1 is arranged in the first control circuit, and the second gear SA-2 is respectively arranged in the second control circuit and in series with the third intermediate coil KA3-0. The third gear SA-3 is in neutral, and all contacts of this gear are in the off state, which is used as the initial gear for calibration.

[0041] In this embodiment, the first switch circuit includes the first normally closed contact KA3-1 (corresponding to the 1-9 contacts of KA3) of the third intermediate relay and the second normally closed contact KA1-2 (corresponding to the 1-9 contacts of KA1) of the first intermediate relay, which are arranged in series. The second switch circuit includes the third normally open contact KA3-3 (corresponding to the 5-9 contacts of KA3) of the third intermediate relay and the fourth normally closed contact KA2-4 (corresponding to the 1-9 contacts of KA2) of the second intermediate relay, which are arranged in series. And one end of the second normally closed contact KA1-2 far from the first normally closed contact KA3-1 is connected to one end of the fourth normally closed contact KA2-4 far from the third normally open contact KA3-3. One end of the second normally closed contact KA1-2 far from the first normally closed contact KA3-1 and one end of the fourth normally closed contact KA2-4 far from the third normally open contact KA3-3 are connected to the input end of the time relay assembly, and the output end of the time relay assembly is connected to the negative pole of the first input power supply.

[0042] In this embodiment, the first response circuit includes a voltage-dividing resistor R, the fifth normally closed contact KA3-5 (corresponding to the 3-11 contacts of KA3) of the third intermediate relay, the sixth normally open contact KA2-6 (corresponding to the 7-11 contacts of KA2) of the second intermediate relay, the seventh normally open contact KA3-7 (corresponding to the 8-12 contacts of KA3) of the third intermediate relay, and the eighth normally closed contact KA2-8 (corresponding to the 3-11 contacts of KA2) of the second intermediate relay. Among them, the fifth normally closed contact KA3-5 and the sixth normally open contact KA2-6 are arranged in parallel to form a first parallel link, and one end of the first parallel link is connected to the fourth port H4 of the time table. One end of the voltage-dividing resistor R is connected to the third port H3 of the time table. The seventh normally open contact KA3-7 and the eighth normally closed contact KA2-8 are arranged in series, and one end of the eighth normally closed contact KA2-8 far from the seventh normally open contact KA3-7 is connected to the other end of the first parallel link. In this embodiment, the value of the voltage-dividing resistor is 50 KΩ.

[0043] In this embodiment, the second response circuit includes the ninth normally closed contact KA3-9 (the 2-10 contact of KA3) of the third intermediate relay and the tenth normally closed contact KA1-10 (the 2-10 contact of KA1) of the first intermediate relay, which are connected in series to form a first series link, and the eleventh normally open contact KA3-11 (the 6-10 contact of KA3) of the third intermediate relay and the twelfth normally closed contact KA2-12 (the 2-10 contact of KA2) of the second intermediate relay, which are connected in series to form a second series link. The first series link and the second series link are connected in parallel, and both ends of the first series link are respectively connected to the first port H1 and the second port H2 of the time schedule.

[0044] Embodiment 2

[0045] As Figures 5-7 shown, the present invention also discloses a medium-voltage distribution panel time relay calibration system, which includes the calibration circuit 150 as described above, and further includes a medium-voltage distribution panel device 200, a switching power supply module 110, a current and voltage monitoring module 120, a time schedule 130, and a connection male plug 140. The medium-voltage distribution panel device 200 includes a distribution panel female plug 210 and a time relay assembly 220. The time relay assembly includes a first time relay 001XT, a second time relay 002XT, and a peripheral circuit. The input end of the switching power supply module 110 is connected to an external power supply 300 through a power button SB1400. The output end of the switching power supply module 110 is respectively connected to the calibration circuit 150 and the current and voltage monitoring module 120. The current and voltage monitoring module 120 is used to monitor the voltage of the first input power supply of the calibration circuit 150. The calibration circuit 150 is sequentially connected to the time relay assembly 220 through the connection male plug 140 and the distribution panel female plug 210. The time relay assembly 220 receives the signal of the calibration circuit 150 and reflects the delay information to the calibration circuit 150. The calibration circuit feeds back the delay information to the time schedule 130. Both the connection male plug and the distribution panel female plug adopt aviation plugs.

[0046] In this embodiment, a terminal block 160 is further included. The current and voltage monitoring module 120, the switching power supply module 110, and the connection male plug 140 are connected to the calibration circuit 150 through the terminal block 160. The calibration circuit 150 is connected to the time schedule 130 through the terminal block 160.

[0047] According to the appendix Figures 6-7 shown, the numbers of each component are explained as follows:

[0048] PA: Current and voltage monitoring module, an integrated module of a voltmeter / ammeter, used to monitor the working current and voltage;

[0049] UR: Switching power supply module, which converts 220VAC power frequency into 110VDC working power supply; that is, the voltage magnitude of the first input power supply.

[0050] SA: Universal conversion switch, used to realize the dual-channel switching of the first time relay 001XT / the second time relay 002XT.

[0051] 001BN: Terminal block.

[0052] 001PJ: Connecting male plug, using an aviation plug.

[0053] SB1: Voltage button, a lit self-locking button, the main power supply button.

[0054] SB2: Second push-button switch, a lit self-locking button, the test button for the first time relay 001XT.

[0055] SB3: Third push-button switch, a lit self-locking button, the test button for the second time relay 002XT.

[0056] R: A 50KΩ voltage-dividing resistor, which enables the time relay component to lose voltage and act, but the time table signal is not lost.

[0057] KA1: First intermediate relay, used as a relay for calibrating the first time relay 001XT.

[0058] KA2: Second intermediate relay, used as a relay for calibrating the second time relay 002XT.

[0059] KA3: Third intermediate relay, used for signal isolation in the first switch circuit, the second switch circuit, the first response circuit and the second response circuit to prevent misoperation.

[0060] 001XP: Fourth intermediate relay.

[0061] 001XF: Fifth intermediate relay.

[0062] 001XT: First time relay.

[0063] 002XT: Second time relay.

[0064] In this embodiment, the time relay component includes an N-type time relay and a DN-type time relay.

[0065] There are two models, R400N and R400DN, for the medium-voltage distribution panel compartments used on-site. There are no obvious differences in appearance between the two models. Only the wiring methods at the relay base are different. Before the existing calibration, it is necessary to determine which specific model it is in order to use the corresponding method and wiring for the test. If the model is misjudged, the correct calibration result cannot be obtained.

[0066] As Figure 3 shown, the N-type time relay includes the fourth intermediate coil 001XP-0 of the fourth intermediate relay, the fourteenth normally closed contact 001XP-14, the fifteenth normally open contact 001XP-15, and the seventeenth normally closed contact 001XP-17; it also includes the fifth intermediate coil 001XF-0 of the fifth intermediate relay, the thirteenth normally open contact 001XF-13, the sixteenth normally closed contact 001XF-16, the eighteenth normally open contact 001XF-18, the nineteenth normally open contact 001XF-19, and the twentieth normally open contact 001XF-20. It further includes the first receiving coil 001XT-0 of the first time relay, the first delay contact 001XT-XU1, and the second delay contact 001XT-XU2; and the second receiving coil 002XT-0 and the third delay contact 002XT-XU of the second time relay. Among them, the first delay contact 001XT-XU1 and the second delay contact 001XT-XU2 are triggered simultaneously. The first delay contact 001XT-XU1, the second delay contact 001XT-XU2, and the third delay contact 002XT-XU are normally closed when powered on and delay open when powered off. The output end of the first switch circuit is connected to the negative pole of the first input power supply through a third series link composed of the sixteenth normally closed contact 001XF-16, the seventeenth normally closed contact 001XP-17, and the first receiving coil 001XT-0 connected in series in sequence. The output end of the second switch circuit is connected to the negative pole of the first input power supply through the nineteenth normally open contact 001XF-19 and the second receiving coil 002XT-0 connected in series in sequence. The first delay contact 001XT-XU1, the third delay contact 002XT-XU, and the fifteenth normally open contact 001XP-15 are connected in parallel to form a second parallel link. One end of the fifth intermediate coil 001XF-0 is connected to the output end of the first response circuit. At the same time, this end is connected to the output end of the first switch circuit through the fourteenth normally closed contact 001XP-14, the second delay contact 001XT-XU2, and the thirteenth normally open contact 001XF-13 connected in series in sequence, constituting another power supply path for the fifth intermediate coil 001XF-0. The other end of the fifth intermediate coil 001XF-0 is connected to the negative pole of the first input power supply through the second parallel link in series. The output end of the first switch circuit is also connected to the negative pole of the first input power supply through a fourth series link composed of the twentieth normally open contact 001XF-20, the eighteenth normally open contact 001XF-18, and the fourth intermediate coil 001XP-0 connected in series in sequence. The third series link and the fourth series link are arranged in parallel, and the fourth intermediate coil 001XP-0 and the second receiving coil 002XT-0 are arranged in parallel.

[0067] As Figure 4As shown, the DN-type time relay includes the fourth intermediate coil 001XP-0 of the fourth intermediate relay, the fourteenth normally closed contact 001XP-14, the seventeenth normally closed contact 001XP-17, the twentieth normally closed contact 001XP-21, and the twenty-second normally closed contact 001XP-22; it also includes the fifth intermediate coil 001XF-0 of the fifth intermediate relay, the thirteenth normally open contact 001XF-13, the sixteenth normally closed contact 001XF-16, the eighteenth normally open contact 001XF-18, the nineteenth normally open contact 001XF-19, and the twentieth normally open contact 001XF-20. It further includes the first receiving coil 001XT-0 of the first time relay, the first delay contact 001XT-XU1, the second delay contact 001XT-XU2, and the second receiving coil 002XT-0 and the third delay contact 002XT-XU of the second time relay; among them, the first delay contact 001XT-XU1 and the second delay contact 001XT-XU2 are triggered simultaneously, and the first delay contact 001XT-XU1, the second delay contact 001XT-XU2, and the third delay contact 002XT-XU are normally closed when powered on and delay open when powered off; the output end of the second switch circuit is connected to the negative pole of the first input power supply through a fifth series link composed of the sixteenth normally closed contact 001XF-16, the seventeenth normally closed contact 001XP-17, and the first receiving coil 001XT-0 connected in series in sequence; the output end of the second switch circuit is also connected to the negative pole of the first input power supply through a sixth series link composed of the twentieth normally open contact 001XF-20, the eighteenth normally open contact 001XF-18, and the fourth intermediate coil 001XP-0 connected in series; the fifth series link and the sixth series link are arranged in parallel, the second receiving coil 002XT-0 and the fourth intermediate coil 001XP-0 are arranged in parallel, and the nineteenth normally open contact 001XF-19, the twenty-first normally closed contact 001XP-21, and the twenty-second normally closed contact 001XF-22 are connected in series in sequence with the second receiving coil 002XT-0 away from the negative pole of the first input power supply to serve as an additional power supply independent of the first receiving coil 001XT-0; the first delay contact 001XT-XU1 and the third delay contact 002XT-XU are connected in parallel to form a third parallel link; the first switch circuit is connected to the negative pole of the first input power supply through the thirteenth normally open contact 001XF-13, the second delay contact 001XT-XU2, the fourteenth normally closed contact 001XP-14, the fifth intermediate coil 001XF-0, and the third parallel link connected in series in sequence; the output end of the first response circuit is arranged between the fourteenth normally closed contact 001XP-14 and the fifth intermediate coil 001XF-0.

[0068] Figure 4The 001PJ:4 in [description] belongs to the schematic diagram of the time relay and does not participate in the calibration work of the time relay. However, in actual calibration work, there is a situation where electrical signals are sent out through 001PJ:4 unplanned. Therefore, the external interference analysis has been drawn in the figure.

[0069] This calibration device is equipped with a power cord and a coaxial cable adapter for use with a high-precision time table. Connect the power cord and the coaxial cable adapter securely. Connect the time table to this device using four general-purpose 4mm test leads. Connect test port 1 (the first port H1) and test port 2 (the second port H2) to the START command of the time table, and connect test port 3 (the third port H3) and test port 4 (the fourth port H4) to the STOP command of the time table. Set the START mode of the time table to dry contact signal detection, with disconnection for action; set the STOP mode to voltage signal detection, with loss of voltage for action.

[0070] Next, the calibration processes for N-type time relays and DN-type time relays will be introduced separately.

[0071] Calibration of N-type time relays:

[0072] When performing the calibration of the first time relay 001XT, turn the universal changeover switch SA to the calibration position of the first time relay 001XT (i.e., turn to the first gear SA-1). At this time, the 1-2 contacts of SA are disconnected, and the 3-4 contacts are conducting. The third intermediate relay KA3 is in an unpowered state. 001PJ:5 is conducted with the positive pole of the first input power supply 110VDC through the first normally closed contact KA3-1 and the second normally closed contact KA1-2. The first receiving coil 001XT-0 of the first time relay is powered on, and the first delayed contact 001XT-XU1 changes from a normally open contact to a closed state. The fifth intermediate coil 001XF-0 of the fifth intermediate relay is divided by the voltage-dividing resistor R, and the voltage cannot reach the suction voltage, so it remains in an un-actuated state. When the test self-locking button of 001XT - the second push-button switch SB2 is pressed, the first intermediate coil KA1-0 of the first intermediate relay is powered on, and the second normally closed contact KA1-2 (the 1-9 contacts of KA1) is disconnected. The first time relay 001XT loses power and starts timing. At the same time, the tenth normally closed contact KA1-10 (the 2-10 contacts of KA1) is disconnected, and the time table detects the start command (the START port changes from closed to open), and the time table enters the timing state. There is an internal resistance at the STOP port of the time table in series with the voltage-dividing resistor R and also participates in voltage division. When the voltage-dividing resistor is 50KΩ, the divided voltage of the fifth intermediate relay 001XF is insufficient to keep it from operating, while the time table obtains a voltage greater than 5V under the action of the internal resistance, and it is judged that the voltage persists, and the situation where the STOP command is directly triggered after the start of timing will not occur. After the first time relay 001XT delays to end, the normally open first delayed contact 001XT-XU1 is disconnected (the contacts of the power-off delay time relay flip when powered on, so the normally open contacts are in a closed state during the delay stage of the time relay and return to the open state after the delay ends), cutting off the power supply of the STOP circuit of the time table. The time table detects the stop command and the timing terminates. At this time, the reading on the time table is the power-off delay time of 001XT.

[0073] When performing the calibration of the second time relay 002XT, turn the universal switch SA to the 002XT calibration position (i.e., turn to the second gear SA-2). At this time, the 1-2 contacts of SA are conducting, and the 3-4 contacts are disconnected. The third intermediate coil KA3-0 of the third intermediate relay is energized. The third normally open contact KA3-3 (the 9-5 contacts of KA3) is closed and conducting, and the first normally closed contact KA3-1 (the 1-9 contacts of KA3) is disconnected. 00:1PJ:5 is conducted to the positive pole of the first input power supply 110VDC through the closed third normally open contact KA3-3 and the fourth normally closed contact KA2-4. The first time relay 001XT is energized, and the first delay contact 001XT-XU1 changes from the normally open state to the closed state. The fifth intermediate coil 001XF-0 is connected to the negative pole of the first input power supply 110VDC. The seventh normally open contact KA3-7 (the 8-12 contacts of KA3) is closed and conducting, and the fifth normally closed contact KA3-5 (the 3-11 contacts of KA3) is disconnected. At this time, the fifth intermediate coil 001XF-0 is directly energized and attracted without passing through the voltage-dividing resistor, the contacts flip, cutting off the power supply of the first time relay 001XT. The first time relay 001XT enters the power-off delay state, and at the same time, the fourth intermediate relay 001XP and the second time relay 002XT are energized and operate. Before the contacts of the second time relay flip, the first delay contact 001XT-XU1 is in the closed delay state, and the excitation state of the fifth intermediate relay 001XF is maintained. When the first time relay 001XT's delay ends, press the 002XT test self-locking button - the third push-button switch SB3. The second intermediate relay KA2 is energized and attracted. At this time, the fourth normally closed contact KA2-4 and the twelfth normally closed contact KA2-12 (the 1-9, 2-10 contacts of KA2) are disconnected. The power supply of the second time relay 002XT is lost and it enters the power-off delay state. The time schedule detects the start command (the START port changes from closed to open), and the time schedule enters the timing state. At the same time, because the second intermediate coil KA2-0 is energized and attracted, the eighth normally closed contact KA2-8 (the 3-11 contacts of KA2) is disconnected, and the sixth normally open contact KA2-6 (the 7-11 contacts of KA2 are closed), switching the fifth intermediate coil 001XF-0 to be in series with the voltage-dividing resistor R and the STOP port of the time schedule. The fifth intermediate relay 001XF loses excitation due to insufficient voltage division. Because the flipping time of each contact of the second intermediate relay KA2 is very short, much less than the delay time of the second time relay 002XT, switching the power supply circuit of the fifth intermediate relay 001XF to be in series with the voltage-dividing resistor and the time schedule does not affect the final timing result. At this time, the STOP port of the time schedule actually experiences a process from no voltage to having voltage, but because the set stop trigger command is voltage loss, the timing stop will not be triggered.When the normally open contact of the second time relay 002XT opens after the delay ends (for a power-off delay time relay, the contact flips when powered on. Therefore, during the delay stage of the time relay, the normally open contact is in the closed state and returns to the open state after the delay ends), the power supply of the STOP circuit of the time table is cut off. The time table detects the stop command and the timing terminates. At this time, the reading on the time table is the power-off delay time of the second time relay 002XT.

[0074] DN type time relay calibration:

[0075] When calibrating the first time relay 001XT, turn the universal switch SA to the calibration position of the first time relay 001XT (i.e., turn to the first gear SA-1). At this time, the 1-2 contacts of SA are disconnected, and the 3-4 contacts are conducting. The third intermediate relay KA3 is in the non-powered state. 001PJ:3 is conducted with the positive pole of the first input power supply 110VDC through the first normally closed contact KA3-1 and the second normally closed contact KA1-2. The first time relay 001XT is powered on, and the first receiving coil 001XT-0 of the first time relay is powered on. The first delay contact 001XT-XU1 changes from a normally open contact to a closed state. The fifth intermediate coil 001XF-0 of the fifth intermediate relay is divided by the voltage dividing resistor R, and the voltage cannot reach the suction voltage, so it is still in the non-suction state. When pressing the test self-locking button of 001XT - the second push-button switch SB2, the first intermediate coil KA1-0 of the first intermediate relay is powered on, and the second normally closed contact KA1-2 (the 1-9 contacts of KA1) is disconnected. The first time relay 001XT loses power and starts timing. At the same time, the tenth normally closed contact KA1-10 (the 2-10 contacts of KA1) is disconnected. The time table detects the start command (the START port changes from closed to open), and the time table enters the timing state. The STOP port of the time table has an internal resistance in series with the voltage dividing resistor R and also participates in voltage division. When the voltage dividing resistor is 50KΩ, the divided voltage of the fifth intermediate relay 001XF is insufficient to keep it from operating, while the time table obtains a voltage greater than 5V under the action of the internal resistance and judges that the voltage persists, so the situation where the STOP command is directly triggered after the start of timing will not occur. After the delay of the first time relay 001XT ends, the normally open first delay contact 001XT-XU1 disconnects (for a power-off delay time relay, the contact flips when powered on. Therefore, during the delay stage of the time relay, the normally open contact is in the closed state and returns to the open state after the delay ends), cutting off the power supply of the STOP circuit of the time table. The time table detects the stop command and the timing terminates. At this time, the reading on the time table is the power-off delay time of 001XT.

[0076] When performing the calibration of the second time relay 002XT, turn the universal switch SA to the 002XT calibration position (i.e., turn to the second gear SA-2). At this time, the 1-2 contacts of SA are conducting, and the 3-4 contacts are disconnected. The third intermediate coil KA3-0 of the third intermediate relay is energized. The third normally open contact KA3-3 (the 9-5 contacts of KA3) is closed and conducting, and the first normally closed contact KA3-1 (the 1-9 contacts of KA3) is disconnected. 00:1PJ:5 is conducted to the positive pole of the first input power supply 110VDC through the closed third normally open contact KA3-3 and the fourth normally closed contact KA2-4. The first time relay 001XT is energized, and the first delay contact 001XT-XU1 changes from the normally open state to the closed state. The fifth intermediate coil 001XF-0 is connected to the negative pole of the first input power supply 110VDC. The seventh normally open contact KA3-7 (the 8-12 contacts of KA3) is closed and conducting, and the fifth normally closed contact KA3-5 (the 3-11 contacts of KA3) is disconnected. At this time, the second intermediate coil KA2-0 is directly energized and attracted without passing through the voltage-dividing resistor, the contacts flip, cutting off the power supply of the first time relay 001XT. The first time relay 001XT enters the power-off delay state, and at the same time, the fourth intermediate relay 001XP and the second time relay 002XT are energized and operate. Before the contacts of the second time relay flip, the first delay contact 001XT-XU1 is in the closed delay state, and the excitation state of the fifth intermediate relay 001XF is maintained. When the first time relay 001XT finishes its delay, press the 002XT test self-locking button - the third push-button switch SB3. The second intermediate relay KA2 is energized and attracted. At this time, the fourth normally closed contact KA2-4 and the twelfth normally closed contact KA2-12 (the 1-9, 2-10 contacts of KA2) are disconnected. The power supply of the second time relay 002XT is lost and it enters the power-off delay state. The timing table detects the start command (the START port changes from closed to open), and the timing table enters the timing state. At the same time, because the second intermediate coil KA2-0 is energized and attracted, the eighth normally closed contact KA2-8 (the 3-11 contacts of KA2) is disconnected, and the sixth normally open contact KA2-6 (the 7-11 contacts of KA2 are closed), switching the fifth intermediate coil 001XF-0 to be in series with the voltage-dividing resistor R and the STOP port of the timing table. The fifth intermediate relay 001XF loses excitation due to insufficient voltage division. Because the flipping time of each contact of the second intermediate relay KA2 is very short, much less than the delay time of the second time relay 002XT, switching the power supply circuit of the fifth intermediate relay 001XF to be in series with the voltage-dividing resistor and the timing table does not affect the final timing result. At this time, the STOP port of the timing table actually experiences a process from no voltage to having voltage, but because the set stop trigger command is voltage loss, the timing stop will not be triggered.When the normally open contact of the second time relay 002XT disconnects after the delay ends (for a power-off delay time relay, the contact flips when powered on. Therefore, during the delay stage of the time relay, the normally open contact is in the closed state and returns to the open state after the delay ends), the power supply of the STOP circuit of the time table is cut off. The time table detects the stop command and the timing terminates. At this time, the reading on the time table is the power-off delay time of the second time relay 002XT.

[0077] Figure 8 This is a schematic diagram of the panel of this experimental device.

[0078] Embodiment 3

[0079] The present invention also discloses a method for calibrating a time relay of a medium-voltage switchboard. Using the above-mentioned medium-voltage switchboard time relay calibration system, it includes the following steps:

[0080] S1. Connect each module, circuit, and component on the medium-voltage switchboard time relay calibration system;

[0081] S2. Set the START mode of the time table to dry contact signal detection, with a disconnect action; set the STOP mode to voltage signal detection, with a loss-of-voltage action;

[0082] S3. Press the power button SB1, and confirm through the current and voltage monitoring module that the output voltage of the switching power supply module is within the specified range; the specified range here is set at 110VDC.

[0083] S4. Turn the universal switch to the gear position of the time relay to be calibrated. At this time, the corresponding time relay is powered on;

[0084] S5. Press the push button switch, the corresponding time relay loses power, the time table starts timing, and after the delay of this time relay ends, the time table stops timing.

[0085] Specifically:

[0086] 1. The wiring connection is firm. Set the START mode of the time table to dry contact signal detection, with a disconnect action, and the STOP mode to voltage signal detection, with a loss-of-voltage action;

[0087] 2. Press the power button SB1, confirm that the output voltage is around 110VDC, and make adjustments at the switching power supply if the deviation is large;

[0088] 3. When calibrating 001XT: Turn SA to the 001XT calibration gear position → press the test button SB2 → record the action time of 001XT after the time table finishes timing → if verification is needed, reset the test button SB2 → reset the reading of the time table → repeat the above operations;

[0089] 4. When performing the 002XT check: Turn SA to the 002XT check position → Wait for 1 s (the check prerequisite involves 001XT. When the delay of 001XT is greater than that of 002XT, data distortion may occur. Wait for 1 s to bypass the action time of 001XT to prevent errors) → Press the test button SB3 → Record the action time of 002XT after the timing of the time table ends → If verification is required, reset the test button SB2 → Reset the reading of the time table → Repeat the above operations;

[0090] (During the operation, if a misoperation occurs, such as rotating the changeover switch without resetting the SB1 button, it may cause the time table to start timing and cannot stop automatically. In this case, only need to reset the unreset button and the time table to continue the subsequent operations. At the same time, a protection circuit to prevent mistransmission of signals is provided inside the check device, and the device will not be damaged due to operation errors, so it can be used with confidence).

[0091] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A time relay calibration circuit for a medium voltage distribution panel, characterized in that, Used to verify the delay signal of the time relay component, including a first switch circuit and a second switch circuit for controlling the demagnetization or magnetization of the time relay coil in the time relay component, and further including a first response circuit for reflecting the delay contact signal in the time relay component. A contact connected to the stop port group of the time table is provided in the first response circuit. The start port group of the time table is arranged in the second response circuit. It also includes a third intermediate coil KA3-0 of a first control circuit, a second control circuit, and a third intermediate relay connected in parallel. A first intermediate coil KA1-0 of a first intermediate relay is provided in the first control circuit. A second intermediate coil KA2-0 of a second intermediate relay is provided in the second control circuit. The first intermediate coil KA1-0, the second intermediate coil KA2-0, and the third intermediate coil KA3-0 respectively control the opening and closing of the corresponding contacts in the first switch circuit, the second switch circuit, the first response circuit, and the second response circuit. The first control circuit, the second control circuit, and the third intermediate coil KA3-0 are connected to the positive pole of the first input power supply through a universal switch. The other end of the third intermediate coil KA3-0 and the output end of the time relay component are connected to the negative pole of the first input power supply; The first control circuit includes a second push-button switch SB2 and a first intermediate coil KA1-0 of a first intermediate relay connected in series. The second control circuit includes a third push-button switch SB3 and a second intermediate coil KA2-0 of a second intermediate relay connected in series. One end of the second push-button switch SB2 away from the first intermediate coil KA1-0 and one end of the third push-button switch SB3 away from the second intermediate coil KA2-0 are connected to one end of the universal switch SA. The other end of the universal switch SA is connected to the positive pole of the first input power supply. One end of the first intermediate coil KA1-0 away from the second push-button switch SB2 and one end of the second intermediate coil KA2-0 away from the third push-button switch SB3 are connected to the negative pole of the first input power supply.

2. The time relay calibration circuit for a medium voltage distribution panel according to claim 1, characterized in that, The universal switch includes three gears, namely a first gear SA-1, a second gear SA-2, and a third gear SA-3. The first gear SA-1 is arranged in the first control circuit. The second gear SA-2 is respectively arranged in the second control circuit and in series with the third intermediate coil KA3-0. The third gear SA-3 is in a neutral position, and all contacts of the third gear SA-3 are in an open state, which is used as the initial gear for verification.

3. The time relay calibration circuit for a medium voltage distribution panel according to claim 1, characterized in that, The first switching circuit includes the first normally-closed contact KA3-1 of the third intermediate relay and the second normally-closed contact KA1-2 of the first intermediate relay, which are arranged in series. The second switching circuit includes the third normally-open contact KA3-3 of the third intermediate relay and the fourth normally-closed contact KA2-4 of the second intermediate relay, which are arranged in series. One end of the second normally-closed contact KA1-2, which is far from the first normally-closed contact KA3-1, is connected to one end of the fourth normally-closed contact KA2-4, which is far from the third normally-open contact KA3-3. One end of the second normally-closed contact KA1-2, which is far from the first normally-closed contact KA3-1, and one end of the fourth normally-closed contact KA2-4, which is far from the third normally-open contact KA3-3, are connected to the input end of the time relay assembly. The output end of the time relay assembly is connected to the negative pole of the first input power supply.

4. The time relay calibration circuit for a medium voltage distribution panel according to claim 1, characterized in that, The first response circuit includes a voltage-dividing resistor R, the fifth normally-closed contact KA3-5 of the third intermediate relay, the sixth normally-open contact KA2-6 of the second intermediate relay, the seventh normally-open contact KA3-7 of the third intermediate relay, and the eighth normally-closed contact KA2-8 of the second intermediate relay. Among them, the fifth normally-closed contact KA3-5 and the sixth normally-open contact KA2-6 are arranged in parallel to form a first parallel link. One end of the first parallel link is connected to the fourth port H4 of the time table. One end of the voltage-dividing resistor R is connected to the third port H3 of the time table. The seventh normally-open contact KA3-7 and the eighth normally-closed contact KA2-8 are arranged in series. One end of the eighth normally-closed contact KA2-8, which is far from the seventh normally-open contact KA3-7, is connected to the other end of the first parallel link.

5. The time relay calibration circuit for a medium voltage distribution panel according to claim 1, characterized in that, The second response circuit includes the ninth normally-closed contact KA3-9 of the third intermediate relay and the tenth normally-closed contact KA1-10 of the first intermediate relay, which are arranged in series to form a first series link, and the eleventh normally-open contact KA3-11 of the third intermediate relay and the twelfth normally-closed contact KA2-12 of the second intermediate relay, which are arranged in series to form a second series link. The first series link and the second series link are arranged in parallel. The two ends of the first series link are respectively connected to the first port H1 and the second port H2 of the time table.

6. A time relay calibration system for a medium voltage distribution panel, comprising the calibration circuit (150) according to any one of claims 1-5, characterized in that, It further includes a medium-voltage distribution panel device (200), a switching power supply module (110), a current and voltage monitoring module (120), a time schedule (130), and a connecting male plug (140). The medium-voltage distribution panel device (200) includes a distribution panel female plug (210) and a time relay assembly (220). The time relay assembly includes a first time relay 001XT, a second time relay 002XT, and a peripheral circuit. The input end of the switching power supply module (110) is connected to an external power supply (300) through a power button SB1 (400). The output end of the switching power supply module (110) is respectively connected to a calibration circuit (150) and a current and voltage monitoring module (120). The current and voltage monitoring module (120) is used to monitor the voltage of the first input power supply of the calibration circuit (150). The calibration circuit (150) is sequentially connected to the time relay assembly (220) through the connecting male plug (140) and the distribution panel female plug (210). The time relay assembly (220) receives the signal of the calibration circuit (150) and reflects the delay information to the calibration circuit (150). The calibration circuit feeds back the delay information to the time schedule (130).

7. The time relay calibration system for a medium voltage distribution panel according to claim 6, characterized in that, It further includes a terminal block (160). The current and voltage monitoring module (120), the switching power supply module (110), and the connecting male plug (140) are connected to the calibration circuit (150) through the terminal block (160). The calibration circuit (150) is connected to the time schedule (130) through the terminal block (160).

8. The time relay calibration system for a medium voltage distribution panel according to claim 6, characterized in that, The time relay assembly includes an N-type time relay and a DN-type time relay; The N-type time relay includes the fourth intermediate coil 001XP-0 of the fourth intermediate relay, the fourteenth normally closed contact 001XP-14, the fifteenth normally open contact 001XP-15, and the seventeenth normally closed contact 001XP-17; it also includes the fifth intermediate coil 001XF-0 of the fifth intermediate relay, the thirteenth normally open contact 001XF-13, the sixteenth normally closed contact 001XF-16, the eighteenth normally open contact 001XF-18, the nineteenth normally open contact 001XF-19, and the twentieth normally open contact 001XF-20. It further includes the first receiving coil 001XT-0 of the first time relay, the first delay contact 001XT-XU1, and the second delay contact 001XT-XU2; and the second receiving coil 002XT-0 and the third delay contact 002XT-XU of the second time relay. Among them, the first delay contact 001XT-XU1 and the second delay contact 001XT-XU2 are triggered simultaneously; the first delay contact 001XT-XU1, the second delay contact 001XT-XU2, and the third delay contact 002XT-XU are normally closed when powered on and delay open when powered off. The output end of the first switch circuit is connected to the negative pole of the first input power supply through a third series link composed of the sixteenth normally closed contact 001XF-16, the seventeenth normally closed contact 001XP-17, and the first receiving coil 001XT-0 connected in series in sequence; the output end of the second switch circuit is connected to the negative pole of the first input power supply through the nineteenth normally open contact 001XF-19 and the second receiving coil 002XT-0 connected in series in sequence; the first delay contact 001XT-XU1, the third delay contact 002XT-XU, and the fifteenth normally open contact 001XP-15 are connected in parallel to form a second parallel link; one end of the fifth intermediate coil 001XF-0 is connected to the output end of the first response circuit. At the same time, this end is connected to the output end of the first switch circuit through the fourteenth normally closed contact 001XP-14, the second delay contact 001XT-XU2, and the thirteenth normally open contact 001XF-13 connected in series in sequence, constituting another power supply path for the fifth intermediate coil 001XF-0; the other end of the fifth intermediate coil 001XF-0 is connected to the negative pole of the first input power supply through the second parallel link in series; the output end of the first switch circuit is also connected to the negative pole of the first input power supply through a fourth series link composed of the twentieth normally open contact 001XF-20, the eighteenth normally open contact 001XF-18, and the fourth intermediate coil 001XP-0 connected in series in sequence; the third series link and the fourth series link are arranged in parallel, and the fourth intermediate coil 001XP-0 and the second receiving coil 002XT-0 are connected in parallel; The DN-type time relay includes the fourth intermediate coil 001XP-0 of the fourth intermediate relay, the fourteenth normally closed contact 001XP-14, the seventeenth normally closed contact 001XP-17, the twentieth normally closed contact 001XP-21, and the twenty-second normally closed contact 001XP-22; it also includes the fifth intermediate coil 001XF-0 of the fifth intermediate relay, the thirteenth normally open contact 001XF-13, the sixteenth normally closed contact 001XF-16, the eighteenth normally open contact 001XF-18, the nineteenth normally open contact 001XF-19, and the twentieth normally open contact 001XF-20. It further includes the first receiving coil 001XT-0 of the first time relay, the first delay contact 001XT-XU1, the second delay contact 001XT-XU2, and the second receiving coil 002XT-0 and the third delay contact 002XT-XU of the second time relay; among them, the first delay contact 001XT-XU1 and the second delay contact 001XT-XU2 are triggered simultaneously, and the first delay contact 001XT-XU1, the second delay contact 001XT-XU2, and the third delay contact 002XT-XU are normally closed when powered on and delay open when powered off; the output end of the second switch circuit is connected to the negative pole of the first input power supply through a fifth series link composed of the sixteenth normally closed contact 001XF-16, the seventeenth normally closed contact 001XP-17, and the first receiving coil 001XT-0 in series; the output end of the second switch circuit is also connected to the negative pole of the first input power supply through a sixth series link composed of the twentieth normally open contact 001XF-20, the eighteenth normally open contact 001XF-18, and the fourth intermediate coil 001XP-0 in series; the fifth series link and the sixth series link are arranged in parallel, the second receiving coil 002XT-0 and the fourth intermediate coil 001XP-0 are arranged in parallel, and the nineteenth normally open contact 001XF-19, the twenty-first normally closed contact 001XP-21, and the twenty-second normally closed contact 001XF-22 are sequentially connected in series to the second receiving coil 002XT-0 away from the negative pole of the first input power supply to serve as an additional power supply independent of the first receiving coil 001XT-0; the first delay contact 001XT-XU1 and the third delay contact 002XT-XU are connected in parallel to form a third parallel link; the first switch circuit is connected to the negative pole of the first input power supply through the thirteenth normally open contact 001XF-13, the second delay contact 001XT-XU2, the fourteenth normally closed contact 001XP-14, the fifth intermediate coil 001XF-0, and the third parallel link in series; the output end of the first response circuit is arranged between the fourteenth normally closed contact 001XP-14 and the fifth intermediate coil 001XF-0.

9. A time relay calibration method for a medium voltage distribution panel, using the time relay calibration system for a medium voltage distribution panel according to any one of claims 6-8, characterized in that, It includes the following steps: S1. Connect each module, circuit, and component on the medium-voltage distribution panel time relay calibration system; S2. Set the START mode of the time schedule to dry contact signal detection and disconnection action; set the STOP mode to voltage signal detection and under-voltage action; S3. Press the power button SB1, and confirm through the current and voltage monitoring module that the output voltage of the switching power supply module is within the specified range; S4. Turn the universal switch to the gear of the time relay to be calibrated. At this time, the corresponding time relay is powered on; S5. Press the push-button switch, the corresponding time relay loses power, and the time schedule starts timing. After the time delay of the time relay ends, the time schedule stops timing.

Images