Electrical switch unit, system and method for detecting service life of electrical switch unit

Abstract

The invention relates to the field of electric switch service life detection, and provides an electric switch unit and an electric switch unit service life detection system and method, and the electric switch unit comprises 2N electric switches K1-1, K1-2, K2-1, K2-2... KN-1 and KN-2; every two electrical switches are sequentially connected in series to form a group, the N groups of electrical switches connected in series are combined to form an electrical switch unit, and N is 2 or 3. A detection point is arranged between two electrical switches which are connected in series in each group, and N detection points are arranged in total; the insulation resistance value or the voltage value of the electrical switch unit is obtained through detection of two detection points of every two groups of series electrical switches. The electrical switch unit structure can avoid interference of an external circuit, enables the insulation resistance value to be accurately detected, calculates the number of remaining use times of the electrical switch unit according to the insulation resistance value, and avoids safety accidents caused by failure of the electrical switch.

Description

Technical Field

[0001] The present application relates to the field of electrical switch life detection, and in particular to an electrical switch unit, and an electrical switch unit life detection system and method. Background Art

[0002] Electrical switches are widely used in power, electrical, and charging systems. However, in actual operation, factors such as aging, environmental pollution, and temperature can cause electrical switches to stick and fail. Failure to effectively monitor the health of electrical switches can lead to serious electrical accidents such as leakage and fire, endangering user safety.

[0003] How to effectively monitor the health status of electrical switches in real time and provide timely warnings is a pain point in the industry. Summary of the Invention

[0004] In view of this, embodiments of the present application provide an electrical switch unit, an electrical switch unit life detection system, and a method to solve the problem in the prior art that the remaining service life of the electrical switch cannot be accurately detected.

[0005] In a first aspect of an embodiment of the present application, an electrical switch unit is provided, comprising: 2N electrical switches K1-1, K1-2, K2-1, K2-2...KN-1, KN-2; every two electrical switches are connected in series to form a group, and the N groups of electrical switches connected in series are combined into an electrical switch unit, where N is 2 or 3; a detection point is set between each group of two electrical switches connected in series, for a total of N detection points; the insulation resistance value or voltage value of the electrical switch unit is obtained by detecting the two detection points of each two groups of electrical switches connected in series.

[0006] In a second aspect of an embodiment of the present application, a life detection system for an electrical switch unit is provided, comprising an electrical switch unit and a control system; wherein the control system comprises an insulation resistance detection unit and a fault warning unit; the insulation resistance detection unit detects the insulation resistance value of the electrical switch unit through two detection points of each two groups of electrical switches connected in series.

[0007] According to a third aspect of an embodiment of the present application, a method for detecting the life of an electrical switch is provided. Upon receiving an instruction to detect the insulation resistance of an electrical switch unit, the control system detects the insulation resistance value of the electrical switch unit through an insulation resistance detection unit. When the insulation resistance value is lower than a preset value, the control system issues an early warning through a fault early warning unit.

[0008] Compared with the prior art, the embodiments of the present application have at least the following beneficial effects: by connecting N groups of electrical switches in series to form an electrical switch unit, setting a detection point between the two electrical switches in each group in series, and detecting the insulation resistance value of the electrical switch unit through each detection point of the switch unit, the interference caused by the load circuit can be effectively avoided, the insulation resistance value of the switch unit can be accurately detected, and the remaining number of uses of the electrical switch unit can be calculated based on the insulation resistance value. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A schematic diagram of an electrical switch unit composed of two sets of electrical switches connected in series; Figure 2 A schematic diagram of an electrical switch unit composed of three sets of electrical switches connected in series; Figure 3 It is a schematic diagram of an electrical switch unit with a pre-charge structure; Figure 4 Schematic diagram of the life detection system for an electrical switch unit composed of two sets of electrical switches connected in series; Figure 5 Schematic diagram of an electrical switch unit life detection system consisting of three sets of electrical switches connected in series; Figure 6 Schematic diagram of an electrical switch unit life detection system consisting of two sets of series-connected electrical switches with a selection switch; Figure 7 Schematic diagram of an electrical switch unit life detection system consisting of three sets of series-connected electrical switches with a selection switch; DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0011] Ideally, when an electrical switch is in the open circuit state, the insulation resistance is infinite. However, in reality, due to environmental factors (humidity, temperature, etc. can affect insulation resistance), material quality (the performance of the insulation material directly affects the resistance value), equipment aging (increased usage time may lead to a decrease in insulation performance), and other factors, the insulation resistance of an electrical switch in the open circuit state is usually not infinite. In addition, different electrical switches have an initial insulation resistance value when they leave the factory. The larger the initial insulation resistance value, the better the insulation performance of the electrical switch and the healthier its lifespan.

[0012] During the use of the electrical switch, its insulation resistance value will decrease, the performance of the electrical switch will decline, and the electrical switch contacts will easily stick and become difficult to disconnect. In this case, If the insulation resistance value and health status of the electrical switch cannot be accurately monitored, arcing, leakage fire, safety accidents, etc. may easily occur.

[0013] In response to the above technical problems, in related technologies, when an electrical switch is connected to a circuit, the circuit usually includes a load, such as a battery or capacitor. If the insulation resistance value on both sides of the electrical switch is directly detected, it will be affected by the load, making it impossible to accurately detect the insulation resistance value of the electrical switch itself and truly monitor its health status.

[0014] In view of this, an embodiment of the present application provides an electrical switch unit, which combines N groups of electrical switches connected in series into an electrical switch unit and connects it to the circuit. By detecting the change in the insulation resistance value of the electrical switch unit, the remaining number of uses of the entire electrical switch unit is calculated. When the insulation resistance value of the electrical switch unit drops to a certain threshold, such as a certain safety threshold, an early warning is issued.

[0015] Figure 1-2 This is a schematic diagram of an electrical switch unit provided in an embodiment of the present application. Specifically, the electrical switch unit includes 2N electrical switches K1-1, K1-2, K2-1, K2-2...KN-1, KN-2; every two electrical switches are connected in series into a group in sequence, and the N groups of electrical switches connected in series are combined into an electrical switch unit, where N is 2 or 3; a detection point is set between each group of two electrical switches connected in series, for a total of N detection points; the insulation resistance value or voltage value of the electrical switch unit is obtained by detecting the two detection points of each two groups of electrical switches connected in series.

[0016] In this application, the electrical switch is an electromagnet switch, which controls the on and off of the circuit by energizing and de-energizing the electromagnet, such as a switch such as a relay or a contactor, and can include a DC switch or an AC switch, especially a high-voltage DC vacuum switch for high-voltage circuits.

[0017] In the embodiment of the present application, when N=2, as shown in FIG. Figure 1 As shown, electrical switches K1-1 and K1-2 are connected in series to form a group, and electrical switches K2-1 and K2-2 are connected in series to form a group. The two groups of electrical switches connected in series constitute an electrical switch unit. Preferably, the two groups of electrical switches connected in series are arranged side by side to form an electrical switch unit. The combined electrical switch unit can be used in a two-phase electrical circuit; an insulation resistance detection point C is set between the electrical switches K1-1 and K1-2 connected in series, and a detection point D is set between the electrical switches K2-1 and K2-2 connected in series, for a total of two detection points; detection points C and D are used to detect the insulation resistance value of the electrical switch unit.

[0018] In some embodiments of the present application, when N=3, as shown in FIG. Figure 2 As shown, electrical switches K1-1 and K1-2 are connected in series to form a group, electrical switches K2-1 and K2-2 are connected in series to form a group, and electrical switches K3-1 and K3-2 are connected in series to form a group. The three groups of electrical switches connected in series form an electrical switch unit, preferably a low voltage. The three groups of electrical switches connected in series are arranged side by side to form an electrical switch unit. The combined electrical switch unit can be used in a three-phase electrical circuit. An insulation resistance detection point C is set between the series-connected electrical switches K1-1 and K1-2, a detection point D is set between the series-connected electrical switches K2-1 and K2-2, and a detection point E is set between the series-connected electrical switches K3-1 and K3-2, for a total of three detection points. Detection points C, D, and E are used to detect the insulation resistance value of the electrical switch unit. In some embodiments, N may also be a positive integer greater than 3, depending on the number of phases connected to the circuit.

[0019] Compared with the prior art, due to the interference of the load circuit, it is impossible to accurately and directly measure the insulation resistance value of the electrical switch in the circuit, resulting in the inability to accurately estimate the service life of the electrical switch, leading to the technical problem that arcs are generated in the circuit where the electrical switch is located and fire and other safety accidents occur. The present application combines N groups of electrical switches connected in series into an electrical switch unit and then connects it to the circuit, and sets N detection points between the N groups of electrical switches connected in series to isolate the interference of the external load. It can accurately detect the changes in the insulation resistance value of the electrical switch unit and determine its remaining life span.

[0020] In some embodiments, when N is 2, the electrical switch unit further includes two pre-charging gas switches K1-3, K1-4 and a pre-charging resistor R1; the two pre-charging gas switches are connected in series with the pre-charging resistor and then connected in parallel to both ends of the first group of series electrical switches K1-1, K1-2.

[0021] In order to further protect the electrical switch unit and its circuit, when the electrical switch unit is closed or opened, no arc will be generated to burn the electrical switch unit and related circuits, such as Figure 3 As shown, the electrical switch unit also includes two pre-charge gas switches K1-3, K1-4 and a pre-charge resistor R1; the pre-charge gas switches and the pre-charge resistor are connected in series and then in parallel to the input and output ends of the first group of series electrical switches K1-1, K1-2.

[0022] For example, when the electrical switch is connected to the energy storage battery circuit, in order to further protect the relevant circuit, the pre-charge switches K1-3 and K1-4 can be connected in series with the pre-charge resistor R1 and then connected in parallel to the input and output ends of the electrical switches K1-1 and K1-2.

[0023] The current is limited by a pre-charge resistor R1 (for example, 200-1000 ohms, the resistance value is set according to the customer's load conditions); When the instruction to close the electrical switch unit is received, the two pre-charging gas switches K1-3, K1-4 and the second group of series electrical switches K2-1, K2-2 are closed first to pre-charge the capacitive load. When the voltage difference between the left and right sides of the electrical switch unit is less than the preset value, the pre-charging is completed, and then the first group of series electrical switches K1-1, K1-2 are closed, and then the pre-charging gas switches K1-3, K1-4 are opened.

[0024] When receiving the instruction to disconnect the electrical switch unit, the pre-charge switches K1-3 and K1-4 are closed first, and then the first group of series electrical switches K1-1 and K1-2 are disconnected. After a preset delay time (for example, 2s), the pre-charge switches K1-3 and K1-4 are disconnected; then the second group of series electrical switches K2-1 and K2-2 are disconnected.

[0025] In an embodiment of the present application, a pre-charge switch and a pre-charge resistor are provided to protect the electrical switch of the electrical switch unit from generating an arc and burning the switch before closing or opening, thereby further protecting the electrical switch unit and the circuit in which it is located.

[0026] In some embodiments, a detection point M is set between the two pre-charging gas switches K1-3 and K1-4, and the insulation resistance value or voltage value of the electrical switch unit is obtained by detecting the detection point M and the detection point D between the electrical switches K2-1 and K2-2.

[0027] In an embodiment of the present application, by setting two pre-charging switches and setting a detection point M between the two pre-charging switches, the insulation resistance value of the electrical switch unit is detected through the detection point M and the detection point D, and the insulation resistance value of the electrical switch unit with the pre-charging switch can be accurately detected.

[0028] In another embodiment of the present application, a life detection system for an electrical switch unit is provided, including an electrical switch unit and a control system 100; wherein, the control system includes an insulation resistance detection unit 101 and a fault warning unit 102; the insulation resistance detection unit 101 detects the insulation resistance value of the electrical switch unit through two detection points of each two groups of electrical switches connected in series; when the insulation resistance value of the electrical switch unit is lower than a preset value, the fault warning unit issues a warning.

[0029] Specifically, if Figure 4As shown, when N=2, the insulation resistance detection unit of the control system detects the insulation resistance value Rcd between the two detection points C and D; according to the above circuit structure, when an insulation resistance value detection instruction is received (the electrical switch is in the normally open state, especially before all electrical switches of the electrical switch unit are closed or after they are disconnected), the insulation resistance value of the electrical switch unit is detected by the control system; when the insulation resistance value is less than a preset value, an alarm is issued by the fault warning unit; the preset value of this embodiment is a safety threshold preset according to safety requirements.

[0030] like Figure 5 As shown, when N=3, the control system's insulation resistance detection unit detects the insulation resistance values Rcd, Rce, and Rde between points C and D, between points D and E, and between points C and E. According to the above circuit structure, upon receiving an insulation resistance detection command (when the electrical switch is in the normally open state, particularly before all electrical switches in the electrical switch unit are closed or after they are opened), the control system detects the three insulation resistance values of the electrical switch unit. If any of the insulation resistance values Rcd, Rce, and Rde is less than a preset value, an alarm is issued by the fault warning unit. The preset value in this embodiment is a safety threshold preset based on safety requirements.

[0031] In an embodiment of the present application, at the beginning of the assembly of the electrical switch unit, the control system will record its initial insulation resistance value. When receiving an insulation resistance value detection instruction, especially before each closing or opening of the electrical switch unit, the control system will collect and record its insulation resistance value, and track the rate of change of the insulation resistance value of the electrical switch unit. When the insulation resistance value is less than the safety preset value, an early warning will be issued, thereby solving the safety problem during the use of the electrical switch.

[0032] In some embodiments of the present application, the remaining usage times of the electrical switch unit are calculated by the insulation resistance value of the electrical switch unit, and when the remaining usage times are less than a preset value, the early warning unit issues an early warning.

[0033] Specifically, electrical switches K1-1, K1-2, ..., KN-1, and KN-2 have a certain insulation resistance in the open-circuit state, rather than the ideal infinite value. For example, the EVQ250 electrical switch has an initial factory insulation resistance of 1000 megohms, according to its electronic manual. Two EVQ250 electrical switches are connected in series through their contacts, forming an electrical switch unit with another set of series-connected electrical switches. The control system's switch unit insulation resistance tester detects an insulation resistance of approximately 1000 megohms.

[0034] The insulation resistance of an electrical switch indicates the quality of the insulation material. The higher the insulation resistance, the more stable the switch's operation and the longer its service life. The remaining service life of an electrical switch is positively correlated with its insulation resistance when disconnected. The greater the insulation resistance when disconnected, the greater the remaining service life of the electrical switch. For example, according to the electronic manual for the EVQ250 electrical switch, its factory insulation resistance is 1000 megohms (1000 VDC). Its service life is: The same is true for the assembled electrical switch unit: the lower the insulation resistance, the fewer the remaining uses. In an embodiment of the present application, upon receiving a command to detect the insulation resistance of the electrical switch unit (typically before closing each electrical switch in the electrical switch unit or after opening each electrical switch), the insulation resistance of the electrical switch unit is detected. For example, if the insulation resistance is 1000MΩ, the remaining uses of the electrical switch unit are 10,000. Based on slight changes in the insulation resistance, the remaining uses of the electrical switch unit are estimated. For example, if the insulation resistance of the electrical switch unit is less than 500K, it indicates that the electrical switch unit has reached the end of its life, and the control system's early warning unit issues an early warning. This method allows the life of each high-voltage DC switch to be monitored.

[0035] On the other hand, after each recording of the insulation resistance value, the control system compares the value with the insulation resistance value recorded in the history, and analyzes the change rate of the insulation resistance value. Speed can be used to further determine whether there are safety hazards in the electrical switch unit.

[0036] In the present application, the remaining number of uses of the electrical switch unit is accurately calculated through the correspondence between the insulation resistance value and the remaining number of uses, and timely warning is given through the fault warning unit of the control system, which can greatly solve the safety hazards of the electrical switch during use; further, the system can also judge the speed of change of the insulation resistance value based on the rate of change of the insulation resistance value, and monitor in advance whether there are safety hazards.

[0037] In some embodiments, the control system further comprises a temperature detection unit, which detects the temperature of the electrical switch unit when the electrical switch unit is closed. When the temperature is higher than a set threshold, the fault warning unit issues an alarm.

[0038] Specifically, after the electrical switch unit is closed, if the temperature is abnormal, for example, higher than the set threshold, it will accelerate the attenuation of the insulation resistance value of the electrical switch unit, further causing a safety accident; on this basis, when the electrical switch unit is closed, if the temperature is abnormal, the fault warning unit will alarm, which can provide timely reminders to avoid safety accidents.

[0039] In some embodiments, the insulation resistance detection unit detects the insulation resistance value of the electrical switch unit through two detection points of each two groups of series electrical switches, including: N detection points are electrically connected to the input ends of N selection switches S1 to SN respectively; the first output ends of the selection switches S1 to SN are electrically connected to the insulation resistance detection unit.

[0040] like Figure 6 As shown, when N=2, the detection point C is electrically connected to the input end of the selection switch S1; the detection point D is electrically connected to the input end of the selection switch S2; the first output ends of the selection switches S1 and S2 are electrically connected to the insulation resistance detection unit of the control system, and when the selection switches S1 and S2 are closed, the insulation resistance value Rcd between points C and D is detected by the insulation resistance detection unit of the control system.

[0041] like Figure 7 As shown, when N=3, detection point C is electrically connected to the input end of the gate switch S1, detection point D is electrically connected to the input end of the gate switch S2, and detection point E is electrically connected to the input end of the gate switch S3; the first output ends of the gate switches S1 and S2 are electrically connected to the insulation resistance detection unit of the control system, and when the gate switches S1 and S2 are closed, the insulation resistance Rcd between points C and D is detected by the insulation resistance detection unit of the control system. The first output ends of the gate switches S1 and S3 are electrically connected to the insulation resistance detection unit of the control system, and when the gate switches S1 and S3 are closed, the insulation resistance Rce between points C and E is detected by the insulation resistance detection unit of the control system. The first output ends of the gate switches S2 and S3 are electrically connected to the insulation resistance detection unit of the control system, and when the gate switches S2 and S3 are closed, the insulation resistance Rde between points D and E is detected by the insulation resistance detection unit of the control system.

[0042] In some embodiments, the control system 100 further includes a voltage detection unit 103, the second output end of the selection switches S1 to SN is electrically connected to the voltage detection unit, and the voltage detection unit detects the voltage value of the electrical switch unit through two detection points of each two groups of series electrical switches.

[0043] For example, Figure 6As shown, when N = 2, detection point C is electrically connected to the input of selector switch S1; detection point D is electrically connected to the input of selector switch S2; the second output terminals of selector switches S1 and S2 are electrically connected to the voltage detection circuit of the control system, and the voltage value Vcd between points C and D is detected by the voltage detection circuit of the control system. When all electrical switches K1-1, K1-2, K2-1, and K2-2 in the electrical switch unit are open, if the voltage value V1 between points C and D is greater than 0, it indicates that the electrical switches in the electrical switch unit are stuck, and the control system early warning unit alarms. When all electrical switches K1-1, K1-2, K2-1, and K2-2 in the electrical switch unit are closed, if the voltage value Vcd between points C and D is equal to 0, it indicates that the electrical switches in the electrical switch unit are faulty, and the control system early warning unit alarms.

[0044] like Figure 7 As shown, when N=3, detection point C is electrically connected to the input of selection switch S1, detection point D is electrically connected to the input of selection switch S2, and detection point E is electrically connected to the input of selection switch S3. The second output terminals of selection switches S1 and S2 are electrically connected to the voltage detection circuit of the control system, and the voltage value Vcd between points C and D is detected by the voltage detection circuit of the control system. The second output terminals of selection switches S1 and S3 are electrically connected to the voltage detection circuit of the control system, and the voltage value Vce between points C and E is detected by the voltage detection circuit of the control system. The second output terminals of selection switches S2 and S3 are electrically connected to the voltage detection circuit of the control system, and the voltage value Vde between points D and E is detected by the voltage detection circuit of the control system. When all electrical switches K1-1, K1-2, K2-1, K2-2, K3-1, and K3-2 in the electrical switch unit are open, if any of the voltage values Vcd between points CD, Vce between points CE, and Vde between points DE is greater than 0, it indicates that the electrical switch unit has electrical switch adhesion, and the control system early warning unit will alarm. When all electrical switches K1-1, K1-2, K2-1, K2-2, K3-1, and K3-2 in the electrical switch unit are closed, if any of the voltage values Vcd between points CD, Vce between points CE, and Vde between points DE is equal to 0, it indicates that the electrical switch unit has electrical switch failure, and the control system early warning unit will alarm.

[0045] The solution of the embodiment of the present application further detects the voltage of the insulated electrical switch unit on the basis of detecting the insulation resistance value of the electrical switch unit, comprehensively evaluates the life health of the electrical switch unit, and issues an alarm, which greatly improves the safety of the electrical switch during use. Security Question.

[0046] In some embodiments, the control system also includes an electrical switch closing and opening time detection unit, which is used to record the closing and opening time of each electrical switch of the electrical switch unit. The control system evaluates the remaining number of uses of the electrical switch unit based on the closing and opening time of each electrical switch of the electrical switch unit and the change in the insulation resistance value of the electrical switch unit.

[0047] Specifically, if the electrical switch is damaged (for example, it is stuck), its opening or closing time will increase; the electrical switch closing and opening time detection unit of the control system detects and records the opening and closing time T of all electrical switches in the electrical switch unit; the control system comprehensively evaluates the health of the electrical switch unit based on the change in the insulation resistance value R and the opening and closing time T of the electrical switch unit, for example, by setting different weights. If the health is lower than the preset value, the early warning unit will alarm.

[0048] In some embodiments, the present application provides a method for detecting the life of an electrical switch unit. When a control system receives an instruction to detect the insulation resistance of the electrical switch unit, it detects the insulation resistance value of the electrical switch unit through an insulation resistance detection unit. When the insulation resistance value is lower than a preset value, the control system issues an early warning through a fault early warning unit.

[0049] The factory initial insulation resistance value R0 of the electrical switch is a fixed value. As the number of uses increases, the insulation resistance value of the electrical switch gradually decreases; the same is true for the resistance value of the assembled electrical switch unit.

[0050] On this basis, upon receiving a command to detect the insulation resistance of the electrical switch unit (before each closing or opening of the electrical switch), the control system uses the insulation resistance detection unit to detect the insulation resistance of the electrical switch unit. A preset value is set, and if the insulation resistance value is lower than the preset value, it indicates that the electrical switch unit is nearing the end of its service life and its lifespan is unsatisfactory. When the insulation resistance value of the electrical switch unit is lower than the preset value, the control system issues a warning via the fault warning unit.

[0051] like Figure 1 As shown in FIG, when N=2, the insulation resistance value of the electrical switch unit is the insulation resistance value between the detection points CD.

[0052] like Figure 2 As shown, when N=3, the insulation resistance value of the electrical switch refers to any one of the insulation resistance value Rcd between detection points CD, the insulation resistance value Rce between detection points CE, and the insulation resistance value Rde between detection points DE.

[0053] In some embodiments, when the electrical switch unit includes a pre-charge gas switch and a pre-charge resistor, upon receiving an instruction to close the electrical switch unit, the pre-charge gas switches K1-3, K1-4 and the second group of series electrical switches K2-1, K2-2 are closed first; when the voltage difference between the input and output ends of the electrical switch unit is pre-charged and is less than a preset value, the electrical switch units K1-1, K1-2 are closed again, and then the pre-charge gas switches K1-3, K1-4 are opened.

[0054] In an embodiment of the present application, a pre-charge switch and a pre-charge resistor are provided to protect the electrical switch of the electrical switch unit from generating an arc before closing and burning the switch; thereby further protecting the electrical switch unit and the circuit in which it is located.

[0055] In some embodiments, when an instruction to disconnect the electrical switch unit is received, the pre-charging gas switches K1-3 and K1-4 are closed first, and then the first group of electrical switches K1-1 and K1-2 are disconnected; after a delay of a preset time period, the second group of electrical switches K2-1 and K2-2 are disconnected.

[0056] Specifically, before all electrical switches in the electrical switch unit are disconnected, the pre-charge switches K1-3 and K1-4 are closed first, and then the first group of electrical switches K1-1 and K1-2 are disconnected. After a preset delay time (for example, 2s), the pre-charge switches K1-3 and K1-4 are disconnected; and then the second group of electrical switches K2-1 and K2-2 are disconnected.

[0057] In the embodiment of the present application, by setting a pre-charge switch and a pre-charge resistor, the electrical switch of the protection electrical switch unit is protected from arcing when it is disconnected, thereby burning the switch; further protecting the electrical switch unit and its circuit In some embodiments, before each closing of the electrical switch unit or after each opening of the electrical switch unit, upon receiving an instruction to detect the insulation resistance of the electrical switch unit, the control system detects the insulation resistance value of the electrical switch unit through the insulation resistance detection unit, including: controlling the selection switches S1 to SN to close to the first output end, and detecting the insulation resistance value of the electrical switch unit.

[0058] In some embodiments, when an instruction to detect the voltage of the electrical switch unit is received, the gate switches S1 to SN are controlled to close to the second output terminal to monitor the voltage value of the electrical switch unit.

[0059] Specifically, by setting the selection switches S1 to SN, and the input ends of the selection switches S1 to SN are respectively electrically connected to N detection points of the electrical switch unit, the first output ends of the selection switches S1 to SN are electrically connected to the insulation resistance detection unit of the control system, and the second output ends are electrically connected to the voltage detection circuit of the control system; through the selection switches S1 to SN, the control system can detect both the insulation resistance and the voltage of the electrical switch unit; through the detected insulation resistance value and voltage value, the health of the electrical switch unit is comprehensively judged to avoid safety accidents caused by failure of the electrical switch.

[0060] In some embodiments, when the temperature detection unit detects a temperature abnormality, the control system issues an early warning through the fault early warning unit.

[0061] Specifically, after the electrical switch unit is closed, if the temperature is abnormal, for example, higher than the set threshold, it will accelerate the attenuation of the insulation resistance value of the electrical switch unit, further causing a safety accident; on this basis, when the electrical switch unit is closed, if the temperature is abnormal, the fault warning unit will alarm, which can provide timely reminders to avoid safety accidents.

[0062] Furthermore, the present invention is not limited to the above-described embodiments, and changes and modifications may be made without departing from the scope of the present invention.

Claims

1. An electrical switch unit, characterized in that: include: 2N electrical switches K1-1, K1-2, K2-1, K2-2...KN-1, KN-2; Every two electrical switches are connected in series to form a group, and the N groups of electrical switches connected in series form an electrical switch unit, where N is 2 or 3; A detection point is set between each set of two electrical switches connected in series, with a total of N detection points; The insulation resistance value or voltage value of the electrical switch unit is obtained by detecting two detection points of each two groups of electrical switches connected in series.

2. The electrical switching unit according to claim 1, wherein When N is 2, the electrical switch unit further includes two pre-charge gas switches K1-3, K1-4 and a pre-charge resistor R1; the two pre-charge gas switches are connected in series with the pre-charge resistor and then connected in parallel to both ends of the first group of series electrical switches K1-1, K1-2.

3. The electrical switching unit according to claim 2, wherein: A detection point M is set between the two pre-charging gas switches K1-3 and K1-4, and the insulation resistance value or voltage value of the electrical switch unit is obtained by detecting the detection point M and the detection point between the electrical switches K2-1 and K2-2.

4. An electrical switch unit life detection system, comprising the electrical switch unit according to any one of claims 1 to 3, characterized in that: Also included is a control system; wherein, The control system includes an insulation resistance detection unit and a fault warning unit; The insulation resistance detection unit detects the insulation resistance value of the electrical switch unit through two detection points of each two groups of electrical switches connected in series; when the insulation resistance value of the electrical switch unit is lower than a preset value, the fault warning unit issues a warning.

5. The electrical switch unit life detection system according to claim 4, characterized in that: The insulation resistance detection unit detects the insulation resistance value of the electrical switch unit through two detection points of each two groups of electrical switches connected in series, including: N detection points are electrically connected to the input ends of N selection switches S1 to SN respectively; the first output ends of the selection switches S1 to SN are electrically connected to the insulation resistance detection unit.

6. The electrical switch unit life detection system according to claim 5, characterized in that: The control system further includes a voltage detection unit, the second output terminals of the selection switches S1 to SN are electrically connected to the voltage detection unit, and the voltage detection unit detects the voltage value of the electrical switch unit through two detection points of each two groups of series-connected electrical switches.

7. The electrical switch unit life detection system according to claim 4, characterized in that: The control system also includes an electrical switch closing and opening time detection unit for recording the closing and opening time of each electrical switch of the electrical switch unit. The control system evaluates the remaining number of uses of the electrical switch unit based on the closing and opening time of each electrical switch of the electrical switch unit and the change in the insulation resistance value of the electrical switch unit.

8. The electrical switch unit life detection system according to claim 4, characterized in that: The control system further includes a temperature detection unit for detecting a temperature of the electrical switch unit when the electrical switch unit is closed.

9. A method for detecting the life of an electrical switch unit, applied to the electrical switch life detection system according to any one of claims 4 to 8, characterized in that: When receiving the instruction to detect the insulation resistance of the electrical switch unit, the control system detects the insulation resistance value of the electrical switch unit through the insulation resistance detection unit. When the insulation resistance value is lower than a preset value, the control system issues an early warning through the fault early warning unit.

10. The method for detecting the life of an electrical switch unit according to claim 9, wherein: In the case where the electrical switch unit includes a pre-charge gas switch and a pre-charge resistor, upon receiving a command to close the electrical switch unit, the pre-charge gas switches K1-3, K1-4 and the second set of series electrical switches K2-1, K2-2 are first closed; When the voltage difference between the input and output terminals of the pre-charged electrical switch unit is less than the preset value, the electrical switch units K1-1 and K1-2 are closed, and then the pre-charged gas switches K1-3 and K1-4 are opened.

11. The method for detecting the life of an electrical switch unit according to claim 10, wherein: When receiving the instruction to disconnect the electrical switch unit, the pre-charging gas switches K1-3 and K1-4 are closed first, and then the first group of electrical switches K1-1 and K1-2 are disconnected; after a delay of a preset time period, the second group of electrical switches K2-1 and K2-2 are disconnected.

12. The method for detecting the life of an electrical switch unit according to claim 9, wherein: When receiving the instruction to detect the insulation resistance of the electrical switch unit, the control system detects the insulation resistance value of the electrical switch unit through the insulation resistance detection unit, including: controlling the selection switches S1 to SN to close to the first output end to detect the insulation resistance value of the electrical switch unit.

13. The method for detecting the life of an electrical switch unit according to claim 9, wherein: When receiving the instruction to detect the voltage of the electrical switch unit, the gate switches S1 to SN are controlled to close to the second output terminal to monitor the voltage value of the electrical switch unit.

14. The method for detecting the life of an electrical switch unit according to claim 9, wherein: When the temperature detection unit detects abnormal temperature, the control system issues an early warning through the fault early warning unit.

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