Switch cabinet and power supply system comprising same

Abstract

The utility model discloses a switch cabinet and a power supply system comprising the same. One path of power supply is taken from the high-voltage control loop to be used by the low-voltage control loop, when the low-voltage power grid input end of the low-voltage control loop has a power supply fault, the high-voltage control loop can be switched to continuously supply power, and the automatic bypass cabinet is further arranged to control the on-off of the high-voltage control loop, so that the on-off of the high-voltage control loop is controlled. The uninterruptible power supply is arranged in the low-voltage control loop and is connected to the automatic bypass cabinet, so that an opening signal can be effectively executed in the automatic bypass cabinet even if the low-voltage control loop is completely powered off, a high-voltage power supply can be opened and broken, the accident occurrence probability is reduced, and accident expansion is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric control devices, in particular to a switch cabinet and a power supply system comprising the same. BACKGROUND

[0002] At present, high-voltage frequency converters are widely used in power, metallurgy, petrochemical, mining and other industries, and are a kind of electrical product with high efficiency, energy saving and environmental protection, which plays a very important role in the production and life of the people. As an auxiliary device for reliable operation of the high-voltage frequency converter system, the switch cabinet is also more and more valued by designers in terms of functional perfection.

[0003] Due to the special scene of the switch cabinet configured for the high-voltage frequency conversion speed regulation system and matched with the high-voltage frequency converter, the power supply is often taken from the high-voltage frequency converter, that is, the three-phase four-wire control power provided by the customer to the high-voltage frequency converter, generally taking one of L and N of the three-phase four-wire control power, which has independent switch protection after entering the switch cabinet. The stability of the power supply is completely determined by the user's low-voltage power supply, and whether the power supply of the switch cabinet is normal cannot be closed loop in the control system. In the existing technology, once a short circuit occurs in the internal control loop of the switch cabinet, the switch trips, and the frequency converter cannot detect the fault information. At this time, the control signal of the frequency converter to the switch cabinet cannot be sent, which may cause confusion of the control logic and even accidents.

[0004] Due to the dual power supply switching function inside the frequency converter, after the control power of the frequency converter is interrupted, it can be switched to the high-voltage phase-shifting transformer as an auxiliary power supply to ensure the control stability of the frequency converter, but the power supply of the switch cabinet is taken from the three-phase four-wire of the customer, so the power supply of the switch cabinet is interrupted.

[0005] In the application of automatic switch cabinet, assuming that a minor accident causes the control power of the switch cabinet to be interrupted, at this time, the high-voltage frequency converter side needs to send a tripping command to the automatic device to cut off the fault source, but due to the lack of control power of the switch cabinet, the tripping command cannot be sent, and the microcomputer protection device in the line cannot collect fault information due to power loss. The black box record of the high-voltage frequency converter records that the frequency converter sends a tripping signal, but the tripping signal is not finally implemented, resulting in failure to trip and disconnect the high-voltage power supply, increasing the probability of accidents and easily leading to the expansion of accidents. CONTENT OF THE UTILITY MODEL

[0006] The embodiments of the present application provide a switch cabinet and a power supply system comprising the same, which are used to solve the technical problems that in the current switch cabinet, the use of high-voltage power supply is affected after a low-voltage power failure, the tripping signal of the high-voltage frequency converter cannot be effectively implemented, resulting in failure to trip and disconnect the high-voltage power supply, increasing the probability of accidents and easily leading to the expansion of accidents.

[0007] The embodiment of the present application provides a switch cabinet, which comprises a high-voltage control circuit and a low-voltage control circuit.

[0008] The high-voltage control circuit is provided with a high-voltage power grid input end and a high-voltage power supply output end, and comprises an automatic bypass cabinet and a high-voltage transformer; the automatic bypass cabinet is connected to the input end and a first output end of the high-voltage transformer to control the on-off of the high-voltage control circuit; the high-voltage power grid input end is connected to the input end of the high-voltage transformer through the automatic bypass cabinet, and the first output end of the high-voltage transformer is connected to the high-voltage power supply output end through the automatic bypass cabinet.

[0009] The low-voltage control circuit is provided with a low-voltage power grid input end and a low-voltage power supply output end, and comprises a first variable frequency power supply switching contactor, a second variable frequency power supply switching contactor and an uninterruptible power supply; the low-voltage power grid input end is connected to the first variable frequency power supply switching contactor, the second output end of the high-voltage transformer is connected to the second variable frequency power supply switching contactor, the first variable frequency power supply switching contactor and the second variable frequency power supply switching contactor are both connected to the low-voltage power supply output end, the low-voltage power supply output end is connected to one end of the uninterruptible power supply, and the other end of the uninterruptible power supply is connected to the automatic bypass cabinet to provide power supply for the automatic bypass cabinet.

[0010] Further, the automatic bypass cabinet is provided with a first bypass control contactor, a second bypass control contactor and a third bypass control contactor; the first bypass control contactor, the high-voltage transformer and the second bypass control contactor are connected in series between the high-voltage power grid input end and the high-voltage power supply output end, the third bypass control contactor and the second bypass control contactor constitute mechanical interlocking, the input end of the third bypass control contactor is connected to the high-voltage power grid input end, and the output end of the third bypass control contactor is also connected to the high-voltage power supply output end.

[0011] Further, the low-voltage control circuit further comprises a variable frequency power supply switching transformer; the input end of the variable frequency power supply switching transformer is connected to the low-voltage power supply output end, the output end of the variable frequency power supply switching transformer is connected to the uninterruptible power supply, and the uninterruptible power supply is connected to the first bypass control contactor, the second bypass control contactor and the third bypass control contactor.

[0012] Further, the low-voltage control circuit further comprises an energy storage control switch, which is connected between the variable frequency power supply switching transformer and the uninterruptible power supply.

[0013] Further, the low-voltage control circuit further comprises a control module connected to an output end of the variable-frequency power supply switching transformer, and the control module is configured to control power supply of the household electrical equipment.

[0014] Further, the switch cabinet further comprises a user incoming line cabinet, and a circuit breaker is arranged in the user incoming line cabinet, and the high-voltage power supply output end is connected to the high-voltage power grid through the circuit breaker.

[0015] Further, the low-voltage control circuit further comprises a first variable-frequency power supply switching switch, and the low-voltage power grid input end is connected to the first variable-frequency power supply switching contactor through the first variable-frequency power supply switching switch.

[0016] Further, the low-voltage control circuit further comprises a second variable-frequency power supply switching switch, and the second output end of the high-voltage transformer is connected to the second variable-frequency power supply switching contactor through the second variable-frequency power supply switching switch.

[0017] Further, the high-voltage transformer comprises a transformer input end, a voltage transformer, an optoelectronic coupler and a transformer output end arranged in series, the transformer input end is connected to the first bypass control contactor, and the transformer output end is connected to the second bypass control contactor.

[0018] The embodiment of the present application further provides a power supply system comprising the switch cabinet.

[0019] The switch cabinet and the power supply system comprising the same provided by the embodiment of the present application can use one power supply in the high-voltage control circuit for the low-voltage control circuit, can switch to the high-voltage control circuit for continuous power supply when the low-voltage power grid input end of the low-voltage control circuit has a power supply fault, further sets an automatic bypass cabinet to control on-off of the high-voltage control circuit, sets an uninterruptible power supply in the low-voltage control circuit and connects the uninterruptible power supply to the automatic bypass cabinet, ensures that the tripping signal can be effectively executed in the automatic bypass cabinet even when the low-voltage control circuit is completely powered off, can trip and disconnect the high-voltage power supply, reduces the probability of accidents, and avoids expansion of accidents. BRIEF DESCRIPTION OF DRAWINGS

[0020] The technical scheme and other beneficial effects of the present application will be apparent through the following detailed description of the specific embodiments of the present application combined with the drawings.

[0021] Figure 1 A structure schematic diagram of a switch cabinet separately powered in the prior art;

[0022] Figure 2 A structure schematic diagram of a switch cabinet taking power from a high-voltage frequency converter in the prior art;

[0023] Figure 3This is a schematic diagram of the switch cabinet provided in an embodiment of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] Currently, the switchgear for high-voltage frequency converters uses two power supply methods for control: either the user provides a separate control power supply, or a power supply is drawn from the high-voltage frequency converter's control power supply. Both methods involve independent control power supplies from the high-voltage power supply. In applications where high-voltage frequency converters control high-voltage systems from low voltage, low-voltage faults often affect the operation of the high-voltage power supply, posing defects and risks.

[0027] like Figure 1 As shown, the first power supply structure provides a separate control power supply to the user. The user's distribution cabinet provides 1PH+N / 220V power to the switch cabinet, and the user's distribution cabinet provides 3PH+N / 220V power to the high-voltage frequency converter. In this way, the switch cabinet is powered separately. Once a short circuit occurs in the internal control circuit of the switch cabinet, the switch trips, and the frequency converter cannot detect the fault information. At this time, the high-voltage frequency converter cannot send control signals to the switch cabinet, which may lead to confusion in the control logic or even an accident.

[0028] like Figure 2 As shown, the second power supply structure is to draw one power source from the high-voltage frequency converter control power supply. The user's distribution cabinet provides 3PH+N / 220V power, one of which is directly supplied to the high-voltage frequency converter, and the other is to draw 1PH+N / 220V from the 3PH+N / 220V power supply to supply the switch cabinet.

[0029] In the prior art, due to the double-path power switching function inside the frequency converter, the high-voltage phase-shifting transformer can be switched to as an auxiliary power supply for power supply after the control power supply of the frequency converter is interrupted, so as to ensure the control power stability of the frequency converter. In this way, the power supply of the switch cabinet is interrupted. Meanwhile, in the application of the switch cabinet, assuming that a minor accident occurs to cause the control power of the switch cabinet to be interrupted, at this time, the high-voltage frequency converter side has a major accident and needs to send a tripping command to the automatic device to cut off the fault source, but due to the lack of the control power supply of the switch cabinet, the tripping command cannot be sent, leading to the expansion of the accident, and the microcomputer protection device in the line cannot collect fault information due to power loss, and the black box record of the high-voltage frequency converter records that the frequency converter sends a tripping signal, leading to the final protection not being implemented. Due to the lack of power supply, the tripping command cannot be sent, and the fault record of the microcomputer protection device is empty.

[0030] Embodiment 1

[0031] As shown in Figure 3 Embodiment 1 of the present application provides a switch cabinet, which comprises a high-voltage control loop and a low-voltage control loop.

[0032] The high-voltage control loop is provided with a high-voltage power grid input end and a high-voltage power supply output end, and comprises an automatic bypass cabinet and a high-voltage transformer VTC. The automatic bypass cabinet is connected to the input end and the first output end of the high-voltage transformer VTC to control the on-off of the high-voltage control loop. The high-voltage power grid input end is connected to the input end of the high-voltage transformer VTC through the automatic bypass cabinet, and the first output end of the high-voltage transformer VTC is connected to the high-voltage power supply output end through the automatic bypass cabinet.

[0033] The low-voltage control loop is provided with a low-voltage power grid input end and a low-voltage power supply output end, and comprises a first variable frequency power switching contactor ICC-KM1, a second variable frequency power switching contactor ICC-KM2 and an uninterruptible power supply UPS. The low-voltage power grid input end is connected to the first variable frequency power switching contactor ICC-KM1, the second output end of the high-voltage transformer VTC is connected to the second variable frequency power switching contactor ICC-KM2, the first variable frequency power switching contactor ICC-KM1 and the second variable frequency power switching contactor ICC-KM2 constitute a mechanical interlock and are connected to the low-voltage power supply output end, the low-voltage power supply output end is connected to one end of the uninterruptible power supply UPS, and the other end of the uninterruptible power supply UPS is connected to the automatic bypass cabinet to provide power supply for the automatic bypass cabinet.

[0034] It can be understood that the embodiment can continuously supply power by switching to the high-voltage control circuit when a power supply fault occurs at the low-voltage grid input end of the low-voltage control circuit, and further setting an automatic bypass cabinet to control the on-off of the high-voltage control circuit, and setting an uninterruptible power supply (UPS) in the low-voltage control circuit connected to the automatic bypass cabinet, so that the tripping signal can be effectively executed in the automatic bypass cabinet even when the low-voltage control circuit is completely powered off, and the high-voltage power supply can be tripped, thereby reducing the probability of accidents and avoiding the expansion of accidents.

[0035] In the contactor control circuit, the inverted triangle symbol between two contactors (such as ICC-KM1 and ICC-KM2) generally represents the mechanical interlocking relationship between them. This interlocking relationship means that the two contactors will act together, that is, when one of the contactors (such as ICC-KM1) acts, the other contactor (such as ICC-KM2) will also act. The inverted triangle indicates that the first variable frequency power switching contactor ICC-KM1 and the second variable frequency power switching contactor ICC-KM2 are interlocked and are not allowed (cannot) be attracted at the same time. In this way, when the first variable frequency power switching contactor ICC-KM1 is closed, the second variable frequency power switching contactor ICC-KM2 is opened; when the second variable frequency power switching contactor ICC-KM2 is closed, the first variable frequency power switching contactor ICC-KM1 is opened.

[0036] The high-voltage power supply output end supplies power to user high-voltage loads, and the user high-voltage loads include a user motor US-M1. The low-voltage power supply output end is used to supply power to household electrical equipment. By simultaneously setting the high-voltage control circuit and the low-voltage control circuit, the demand for supplying power to user high-voltage loads and household electrical equipment can be met, and the adaptability is improved.

[0037] In the embodiment, the automatic bypass cabinet is provided with a first bypass control contactor BPC-KM1, a second bypass control contactor BPC-KM2, and a third bypass control contactor BPC-KM3; the first bypass control contactor BPC-KM1, the high-voltage transformer VTC, and the second bypass control contactor BPC-KM2 are connected in series between the high-voltage grid input end and the high-voltage power supply output end, the third bypass control contactor BPC-KM3 and the second bypass control contactor BPC-KM2 constitute a mechanical interlock, the input end of the third bypass control contactor BPC-KM3 is connected to the high-voltage grid input end, and the output end of the third bypass control contactor BPC-KM3 is also connected to the high-voltage power supply output end.

[0038] The third bypass control contactor BPC-KM3 and the second bypass control contactor BPC-KM2 constitute mechanical interlocking, and the inverted triangle indicates that the third bypass control contactor BPC-KM3 and the second bypass control contactor BPC-KM2 are interlocked and cannot be attracted at the same time. In this way, when the third bypass control contactor BPC-KM3 is closed, the second bypass control contactor BPC-KM2 is opened; when the third bypass control contactor BPC-KM3 is opened, the second bypass control contactor BPC-KM2 is closed.

[0039] In the embodiment, the low-voltage control circuit further comprises a variable-frequency power switching transformer ICC-T2; an input end of the variable-frequency power switching transformer ICC-T2 is connected to the low-voltage power supply output end, an output end of the variable-frequency power switching transformer ICC-T2 is connected to one end of the uninterruptible power supply UPS through the energy storage control switch BPC-QF11, the other end of the uninterruptible power supply UPS is connected to the first bypass control contactor BPC-KM1, the second bypass control contactor BPC-KM2 and the third bypass control contactor BPC-KM3, and the uninterruptible power supply UPS provides power supply for the low-voltage control circuit. When the low-voltage control circuit is completely powered off, the uninterruptible power supply UPS provides power supply, so that the first bypass control contactor BPC-KM1, the second bypass control contactor BPC-KM2 and the third bypass control contactor BPC-KM3 can normally receive the control signal transmitted by the control module, thereby normally realizing the tripping and effectively executing in the automatic bypass cabinet, and the high-voltage power supply can be tripped and disconnected, thereby reducing the probability of accidents and avoiding the expansion of accidents.

[0040] In the embodiment, the low-voltage control circuit further comprises an energy storage control switch BPC-QF11 connected between the variable-frequency power switching transformer ICC-T2 and the uninterruptible power supply UPS. The energy storage control switch BPC-QF11 can control the input and closing of the uninterruptible power supply UPS.

[0041] In the embodiment, the low-voltage control circuit further comprises a control module ICC-KZ connected to an output end of the variable-frequency power switching transformer ICC-T2. The control module ICC-KZ can control the power supply of household electrical equipment or intelligently control the opening and closing of household electrical equipment.

[0042] In the embodiment, the switch cabinet further comprises a user incoming line cabinet, wherein a circuit breaker QF is arranged in the user incoming line cabinet, and the high-voltage power grid input end is connected to the high-voltage power grid through the circuit breaker QF. The high-voltage power grid provides high-voltage power of 10 kV, and the circuit breaker QF can be fused to cut off the high-voltage power supply when the load increases, thereby reducing the probability of accidents and avoiding the expansion of accidents.

[0043] In the embodiment, the low-voltage control circuit further comprises a first variable frequency power supply switching switch ICC-QF1, and the low-voltage power grid input end is connected to the first variable frequency power supply switching contactor ICC-KM1 through the first variable frequency power supply switching switch ICC-QF1. The first variable frequency power supply switching switch ICC-QF1 can control the input and shutdown of the low-voltage control circuit input user control power supply. Preferably, the user control power supply is 380 VAC / 50 Hz / 3PH or 220 VAC / 50 Hz / 3PH. When the user control power supply is interrupted, a time relay is used to send a pulse tripping command to the automatic bypass cabinet.

[0044] In the embodiment, the low-voltage control circuit further comprises a second variable frequency power supply switching contactor ICC-KM2, and the second output end of the high-voltage transformer VTC is connected to the second variable frequency power supply switching contactor ICC-KM2 through the second variable frequency power supply switching contactor ICC-KM2. The second variable frequency power supply switching contactor ICC-KM2 can control the input and shutdown of the power supply branch circuit of the low-voltage control circuit input by the high-voltage control circuit.

[0045] In the embodiment, the high-voltage transformer VTC comprises a transformer input end VTC-TA, a voltage transformer VTC-T1, an optoelectronic coupler COU-U and a transformer output end VTC-HA arranged in series; the transformer input end VTC-TA is connected to the first bypass control contactor, and the second bypass control contactor is connected to the second bypass control contactor BPC-KM2.

[0046] Embodiment 2

[0047] The application provides a power supply system comprising a switch cabinet. The power supply system is connected to a high-voltage power grid and a user control power supply. Preferably, the high-voltage power grid provides high-voltage power of 10 kV, and the user control power supply is 380 VAC / 50 Hz / 3PH or 220 VAC / 50 Hz / 3PH.

[0048] As shown in Figure 3 The switch cabinet comprises a high-voltage control circuit and a low-voltage control circuit. By simultaneously arranging the high-voltage control circuit and the low-voltage control circuit in the switch cabinet, the demand for supplying power to user high-voltage loads and household electrical equipment can be met, and the adaptability is improved.

[0049] The high-voltage control circuit is provided with a high-voltage power grid input end and a high-voltage power supply output end, and comprises an automatic bypass cabinet and a high-voltage transformer VTC; the automatic bypass cabinet is connected to the input end and a first output end of the high-voltage transformer VTC to control the on-off of the high-voltage control circuit; the high-voltage power grid input end is connected to the input end of the high-voltage transformer VTC through the automatic bypass cabinet, and the first output end of the high-voltage transformer VTC is connected to the high-voltage power supply output end through the automatic bypass cabinet.

[0050] The low-voltage control circuit is provided with a low-voltage power grid input end and a low-voltage power supply output end, and comprises a first variable frequency power supply switching contactor ICC-KM1, a second variable frequency power supply switching contactor ICC-KM2 and an uninterruptible power supply UPS; the low-voltage power grid input end is connected to the first variable frequency power supply switching contactor ICC-KM1, the second output end of the high-voltage transformer VTC is connected to the second variable frequency power supply switching contactor ICC-KM2, the first variable frequency power supply switching contactor ICC-KM1 and the second variable frequency power supply switching contactor ICC-KM2 constitute mechanical interlocking and are connected to the low-voltage power supply output end, the low-voltage power supply output end is connected to the uninterruptible power supply UPS, and the uninterruptible power supply UPS is connected to the automatic bypass cabinet.

[0051] It can be understood that, by taking one power supply in the high-voltage control circuit for the low-voltage control circuit, when a power supply fault occurs at the low-voltage power grid input end of the low-voltage control circuit, the high-voltage control circuit can be switched to continue to supply power, and the automatic bypass cabinet is further arranged to control the on-off of the high-voltage control circuit, and the uninterruptible power supply UPS is arranged in the low-voltage control circuit and connected to the automatic bypass cabinet, so that even when the low-voltage control circuit is completely powered off, the tripping signal can be effectively executed in the automatic bypass cabinet, the high-voltage power supply can be tripped and disconnected, the probability of accidents is reduced, and the expansion of accidents is avoided.

[0052] In the contactor control circuit, the inverted triangle symbol between two contactors (such as ICC-KM1 and ICC-KM2) generally represents the mechanical interlocking relationship between them. This interlocking relationship means that the two contactors will act together, that is, when one of the contactors (such as ICC-KM1) acts, the other contactor (such as ICC-KM2) will also follow. The inverted triangle indicates that the first variable frequency power switching contactor ICC-KM1 and the second variable frequency power switching contactor ICC-KM2 are interlocked and are not allowed (cannot) be attracted at the same time. In this way, when the first variable frequency power switching contactor ICC-KM1 is closed, the second variable frequency power switching contactor ICC-KM2 is opened; when the second variable frequency power switching contactor ICC-KM2 is closed, the first variable frequency power switching contactor ICC-KM1 is opened.

[0053] The high-voltage power supply output end supplies power to a user high-voltage load, and the user high-voltage load includes a user motor US-M1. The low-voltage power supply output end is used to supply power to household electrical equipment. By simultaneously setting the high-voltage control loop and the low-voltage control loop, the demand for supplying power to the user high-voltage load and the household electrical equipment can be met, and the adaptability is improved.

[0054] In the embodiment, the automatic bypass cabinet is provided with a first bypass control contactor BPC-KM1, a second bypass control contactor BPC-KM2, and a third bypass control contactor BPC-KM3; the first bypass control contactor BPC-KM1, the high-voltage transformer VTC, and the second bypass control contactor BPC-KM2 are connected in series between the high-voltage power grid input end and the high-voltage power supply output end, the third bypass control contactor BPC-KM3 and the second bypass control contactor BPC-KM2 constitute a mechanical interlocking, the input end of the third bypass control contactor BPC-KM3 is connected to the high-voltage power grid input end, and the output end of the second bypass control contactor BPC-KM2 is connected to the high-voltage power supply output end.

[0055] The third bypass control contactor BPC-KM3 and the second bypass control contactor BPC-KM2 constitute a mechanical interlocking, and the inverted triangle indicates that the third bypass control contactor BPC-KM3 and the second bypass control contactor BPC-KM2 are interlocked and are not allowed (cannot) be attracted at the same time. In this way, when the third bypass control contactor BPC-KM3 is closed, the second bypass control contactor BPC-KM2 is opened; when the third bypass control contactor BPC-KM3 is opened, the second bypass control contactor BPC-KM2 is closed.

[0056] In the embodiment, the low-voltage control circuit further comprises a variable frequency power switching transformer ICC-T2; an input end of the variable frequency power switching transformer ICC-T2 is connected to the low-voltage power supply output end, an output end of the variable frequency power switching transformer ICC-T2 is connected to the uninterruptible power supply UPS through the energy storage control switch BPC-QF11, and the uninterruptible power supply UPS is connected to the first bypass control contactor BPC-KM1, the second bypass control contactor BPC-KM2 and the third bypass control contactor BPC-KM3. When the low-voltage control circuit is completely powered off, the uninterruptible power supply UPS can also realize that the tripping signal is effectively executed in the automatic bypass cabinet, the high-voltage power supply can be tripped and disconnected, the probability of accidents is reduced, and the expansion of accidents is avoided.

[0057] In the embodiment, the low-voltage control circuit further comprises an energy storage control switch BPC-QF11 connected between the variable frequency power switching transformer ICC-T2 and the uninterruptible power supply UPS. The energy storage control switch BPC-QF11 can control the input and shutdown of the uninterruptible power supply UPS.

[0058] In the embodiment, the low-voltage control circuit further comprises a control module ICC-KZ connected to an output end of the variable frequency power switching transformer ICC-T2. The control module ICC-KZ is a control system of the high-voltage frequency converter and comprises electrical and hardware devices, and can control the opening and closing of the high-voltage frequency converter.

[0059] In the embodiment, the switch cabinet further comprises a user incoming line cabinet, and a circuit breaker QF is arranged in the user incoming line cabinet, and the high-voltage power supply output end is connected to a high-voltage power grid through the circuit breaker QF. The high-voltage power grid provides high-voltage power of 10kV, and the circuit breaker QF can be fused and cut off when the load increases, thereby reducing the probability of accidents and avoiding the expansion of accidents.

[0060] In the embodiment, the low-voltage control circuit further comprises a first variable frequency power switching switch ICC-QF1, and the low-voltage power grid input end is connected to the first variable frequency power switching contactor ICC-KM1 through the first variable frequency power switching switch ICC-QF1. The first variable frequency power switching switch ICC-QF1 can control the input and shutdown of the user control power supply input into the low-voltage control circuit. Preferably, the user control power supply is 380VAC / 50Hz / 3PH or 220VAC / 50Hz / 3PH.

[0061] In the embodiment, the low-voltage control circuit further comprises a second variable-frequency power supply switch ICC-QF2, and a second output end of the high-voltage transformer VTC is connected to the second variable-frequency power supply switch contactor ICC-KM2 through the second variable-frequency power supply switch ICC-QF2. The second variable-frequency power supply switch ICC-QF2 can control the input and the shutdown of the power supply branch of the low-voltage control circuit input by the high-voltage control circuit.

[0062] In the embodiment, the high-voltage transformer VTC comprises a transformer input end VTC-TA, a voltage transformer VTC-T1, an optoelectronic coupler COU-U and a transformer output end VTC-HA arranged in series, the transformer input end VTC-TA is connected to the first bypass control contactor BPC-KM1, and the transformer output end VTC-HA is connected to the second bypass control contactor BPC-KM2.

[0063] The switch cabinet and the power supply system comprising the same provided by the embodiments of the present application can use a power supply in the high-voltage control circuit for the low-voltage control circuit, can switch to the high-voltage control circuit for continuous power supply when a power supply fault occurs at the low-voltage power grid input end of the low-voltage control circuit, further set an automatic bypass cabinet to control the on-off of the high-voltage control circuit, set an uninterruptible power supply UPS in the low-voltage control circuit and connect the UPS to the automatic bypass cabinet, ensure that the tripping signal can be effectively executed in the automatic bypass cabinet even when the low-voltage control circuit is completely powered off, can trip and disconnect the high-voltage power supply, and reduce the probability of accidents and avoid the expansion of accidents.

[0064] In the above embodiments, the description of each embodiment has its own focus, and the part not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0065] The switch cabinet provided by the embodiments of the present application is described in detail above, and the principle and implementation manner of the present application are described by applying specific examples in this paper, and the above embodiment description is only used to help understand the technical solutions and the core idea of the present application; the person skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. Switchgear cabinet, characterized in that The switch cabinet comprises a high-voltage control circuit and a low-voltage control circuit; The high-voltage control circuit is provided with a high-voltage power grid input end and a high-voltage power supply output end, and comprises an automatic bypass cabinet and a high-voltage transformer; the automatic bypass cabinet is connected to the input end and a first output end of the high-voltage transformer to control the on-off of the high-voltage control circuit; the high-voltage power grid input end is connected to the input end of the high-voltage transformer through the automatic bypass cabinet, and the first output end of the high-voltage transformer is connected to the high-voltage power supply output end through the automatic bypass cabinet; The low-voltage control circuit is provided with a low-voltage power grid input end and a low-voltage power supply output end, and comprises a first variable frequency power supply switching contactor, a second variable frequency power supply switching contactor and an uninterruptible power supply; the low-voltage power grid input end is connected to the first variable frequency power supply switching contactor, the second output end of the high-voltage transformer is connected to the second variable frequency power supply switching contactor, the first variable frequency power supply switching contactor and the second variable frequency power supply switching contactor are both connected to the low-voltage power supply output end, the low-voltage power supply output end is connected to one end of the uninterruptible power supply, and the other end of the uninterruptible power supply is connected to the automatic bypass cabinet to provide power supply for the automatic bypass cabinet.

2. Switchgear according to claim 1, characterized in that The automatic bypass cabinet is provided with a first bypass control contactor, a second bypass control contactor and a third bypass control contactor; the first bypass control contactor, the high-voltage transformer and the second bypass control contactor are connected in series between the high-voltage power grid input end and the high-voltage power supply output end, the third bypass control contactor and the second bypass control contactor constitute mechanical interlocking, the input end of the third bypass control contactor is connected to the high-voltage power grid input end, and the output end of the third bypass control contactor is connected to the high-voltage power supply output end.

3. Switchgear according to claim 2, characterized in that The low-voltage control circuit further comprises a variable frequency power supply switching transformer; the input end of the variable frequency power supply switching transformer is connected to the low-voltage power supply output end, the output end of the variable frequency power supply switching transformer is connected to the uninterruptible power supply, and the uninterruptible power supply is connected to the first bypass control contactor, the second bypass control contactor and the third bypass control contactor.

4. Switchgear according to claim 3, characterized in that The low-voltage control circuit further comprises an energy storage control switch connected between the variable frequency power supply switching transformer and the uninterruptible power supply.

5. Switchgear according to claim 3, characterized in that The low-voltage control circuit further comprises a control module connected to the output end of the variable frequency power supply switching transformer, and the control module is used for power supply control of household electrical equipment.

6. The switchgear of claim 1, wherein The switch cabinet further comprises a user incoming line cabinet, and the user incoming line cabinet is provided with a circuit breaker; the high-voltage power supply output end is connected to a high-voltage power grid through the circuit breaker.

7. The switchgear of claim 1, wherein The low-voltage control circuit further comprises a first variable frequency power supply switching switch, and the low-voltage power grid input end is connected to the first variable frequency power supply switching contactor through the first variable frequency power supply switching switch.

8. The switchgear of claim 1, wherein The low-voltage control circuit further comprises a second variable frequency power supply switching switch, and the second output end of the high-voltage transformer is connected to the second variable frequency power supply switching contactor through the second variable frequency power supply switching switch.

9. The switchgear of claim 2, wherein The high-voltage transformer comprises a transformer input end, a voltage transformer, an optoelectronic coupler and a transformer output end arranged in series; the transformer input end is connected to the first bypass control contactor, and the transformer output end is connected to the second bypass control contactor.

10. A power supply system characterized by comprising: A switchgear cabinet comprising the switchgear cabinet according to any one of claims 1 to 9.

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