CN117116690A - Interlocking method and system of conventional island medium-voltage switch cabinet - Google Patents

Abstract

The invention provides an interlocking method and system of a conventional medium-voltage switch cabinet in an island, wherein the method comprises the following steps of: obtaining a circuit diagram of a medium-voltage bus loop and a transformer feeder loop of the conventional island medium-voltage switch cabinet; configuring a mechanical key at a preset position according to the circuit diagram; and interlocking the medium-voltage bus loop and the transformer feeder loop through the mechanical key. The invention can solve the problem caused by too far equipment distance in the electrical hard-wired interlocking, avoid misoperation and improve the interlocking reliability of the conventional medium-voltage switch cabinet.

Description

Interlocking method and system of conventional island medium-voltage switch cabinet

Technical Field

The invention relates to the technical field of interlocking of medium-voltage switch cabinets, in particular to an interlocking method of a conventional island medium-voltage switch cabinet and an interlocking system of the conventional island medium-voltage switch cabinet.

Background

In order to ensure personal safety and prevent misoperation, the nuclear power conventional island medium voltage switch cabinet meets the five-prevention requirement, namely: preventing the circuit breaker from being opened or closed by mistake; the on-load separation switch is prevented; preventing the electrification of the grounding wire or the grounding switch; preventing the combined circuit breaker with the grounding wire or the grounding switch; preventing false entry into the charging interval.

For the five-prevention requirement of a nuclear power conventional island medium-voltage switch cabinet, in the related technology, the electric hard-wired interlocking is mainly adopted, and the problems of complex wiring, non-visual interlocking logic and the like exist in the electric hard-wired interlocking. Firstly, for a nuclear power conventional island medium-voltage switch cabinet, as the distance between the medium-voltage switch cabinet and a downstream low-voltage switch cabinet is far, the length of a cable required by hard-wire interlocking is long, so that the reliability of the hard-wire interlocking is reduced, and secondly, operators cannot intuitively judge whether the interlocking logic is met or not when the operation is performed, and misoperation is easy to cause.

Disclosure of Invention

The invention provides an interlocking method and system for a conventional island medium-voltage switch cabinet, which can solve the problem caused by too far equipment distance in electric hard-wire interlocking, avoid misoperation and improve the interlocking reliability of the conventional island medium-voltage switch cabinet.

The technical scheme adopted by the invention is as follows:

an interlocking method of a conventional island medium voltage switchgear comprises the following steps: obtaining a circuit diagram of a medium-voltage bus loop and a transformer feeder loop of the conventional island medium-voltage switch cabinet; configuring a mechanical key at a preset position according to the circuit diagram; and interlocking the medium-voltage bus loop and the transformer feeder loop through the mechanical key.

In one embodiment of the invention, the mechanical key comprises a proof isolation key and a ground enable key, wherein configuring the mechanical key at the preset location according to the circuit diagram comprises: the proving isolation key is configured at a wire inlet breaker and a voltage transformer of the medium-voltage bus loop, and the permitted grounding key is configured at a grounding switch of the medium-voltage bus, wherein the permitted grounding key is configured with a key exchange box; interlocking the medium voltage bus loop by the mechanical key comprises: releasing the proof isolation key when the incoming line circuit breaker is disconnected and the voltage transformer is withdrawn, and exchanging the grounding-allowed key from the key exchange box; and closing the bus grounding switch by using the grounding permission key.

In one embodiment of the invention, the mechanical key comprises a proving ground key and an admission key, wherein configuring the mechanical key at the preset position according to the circuit diagram comprises: the proving grounding key is configured at a wire inlet power supply grounding switch of the transformer feeder circuit, and an admission key is configured at a cabinet door of the low-voltage transformer; interlocking the medium voltage bus loop by the mechanical key comprises: when a line incoming power supply breaker of the feeder circuit of the transformer is opened, allowing the line incoming power supply grounding switch to be closed, and releasing the evidence grounding key; when the proving grounding key is released, the low-voltage transformer cabinet door is opened by using an access permission key, and the access permission key is locked in the low-voltage transformer cabinet door.

In one embodiment of the invention, the mechanical key comprises a certified isolation key, a certified ground key and the allowed access key, wherein configuring the mechanical key at the preset location according to the circuit diagram comprises: the proving isolation key is configured at a breaker of a low-voltage incoming power supply of the transformer feeder circuit, the proving grounding key is configured at a grounding switch of the low-voltage incoming power supply of the transformer feeder circuit, and an admission key is configured at a cabinet door of the low-voltage transformer; interlocking the transformer feeder loop with the mechanical key comprises: releasing the proof isolation key when the breaker of the low-voltage incoming line power supply is disconnected; when the proving isolation key is in the grounding switch of the low-voltage incoming line voltage and the breaker of the low-voltage incoming line power supply is switched off, the grounding switch of the low-voltage incoming line power supply is allowed to be closed, and the proving grounding key is released; when the proving grounding key is released, the low-voltage transformer cabinet door is opened by using an access permission key, and the access permission key is locked in the low-voltage transformer cabinet door.

An interlock system for a conventional island medium voltage switchgear comprising: the acquisition device is used for acquiring circuit diagrams of a medium-voltage bus loop and a transformer feeder loop of the conventional island medium-voltage switch cabinet; configuration means for configuring a mechanical key at a preset position according to the circuit diagram; and the interlocking device is used for interlocking the medium-voltage bus loop and the transformer feeder loop through the mechanical key.

In one embodiment of the invention, the mechanical key comprises a proof isolation key and a ground enable key, wherein the configuring means configures the mechanical key at the preset position according to the circuit diagram comprises: the proving isolation key is configured at a wire inlet breaker and a voltage transformer of the medium-voltage bus loop, and the permitted grounding key is configured at a grounding switch of the medium-voltage bus, wherein the permitted grounding key is configured with a key exchange box; the interlocking device interlocking the medium-voltage bus loop through the mechanical key comprises the following steps: releasing the proof isolation key when the incoming line circuit breaker is disconnected and the voltage transformer is withdrawn, and exchanging the grounding-allowed key from the key exchange box; and closing the bus grounding switch by using the grounding permission key.

In one embodiment of the invention, the mechanical key comprises a proving ground key and an admission key, wherein the configuring means configures the mechanical key at the preset position according to the circuit diagram comprises: the proving grounding key is configured at a wire inlet power supply grounding switch of the transformer feeder circuit; the interlocking device interlocking the medium-voltage bus loop through the mechanical key comprises the following steps: when a line incoming power supply breaker of the feeder circuit of the transformer is opened, allowing the line incoming power supply grounding switch to be closed, and releasing the evidence grounding key; when the proving grounding key is released, the low-voltage transformer cabinet door is opened by using an access permission key, and the access permission key is locked in the low-voltage transformer cabinet door.

In one embodiment of the invention, the mechanical key comprises a certified isolation key, a certified ground key and the allowed access key, wherein the configuring means configures the mechanical key at the preset location according to the circuit diagram comprises: configuring the proving isolation key at a breaker of a low-voltage incoming power supply of the transformer feeder circuit, configuring the proving grounding key at a grounding switch of the low-voltage incoming power supply of the transformer feeder circuit, and configuring an admission key at a cabinet door of the low-voltage transformer; the interlocking device interlocking the feeder circuit of the transformer through the mechanical key comprises: releasing the proof isolation key when the breaker of the low-voltage incoming line power supply is disconnected; when the proving isolation key is in the grounding switch of the low-voltage incoming line voltage and the breaker of the low-voltage incoming line power supply is switched off, the grounding switch of the low-voltage incoming line power supply is allowed to be closed, and the proving grounding key is released; when the proving grounding key is released, the low-voltage transformer cabinet door is opened by using an access permission key, and the access permission key is locked in the low-voltage transformer cabinet door.

The invention has the beneficial effects that:

according to the invention, the circuit diagrams of the medium-voltage bus loop and the transformer feeder loop of the conventional island medium-voltage switch cabinet are obtained, the mechanical key is configured at the preset position according to the circuit diagrams, and finally the medium-voltage bus loop and the transformer feeder loop are interlocked through the mechanical key, so that the problem caused by too far equipment distance in electric hard wiring interlocking can be solved, misoperation is avoided, and the interlocking reliability of the conventional island medium-voltage switch cabinet can be improved.

Drawings

FIG. 1 is a flow chart of a method of interlocking a conventional medium-voltage island switchgear according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a medium voltage bus loop interlock scheme according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of a low voltage transformer feeder loop interlock scheme according to one embodiment of the present invention;

FIG. 4 is a schematic diagram of a low voltage transformer feeder loop interlock scheme according to another embodiment of the present invention;

fig. 5 is a block schematic diagram of an interlock system of a conventional island medium voltage switchgear according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Fig. 1 is a flowchart of an interlocking method of a conventional island medium voltage switchgear according to an embodiment of the present invention.

As shown in fig. 1, the interlocking method of the conventional island medium voltage switchgear according to the embodiment of the invention comprises the following steps:

s1, obtaining a circuit diagram of a medium-voltage bus loop and a transformer feeder loop of a conventional island medium-voltage switch cabinet.

S2, configuring a mechanical key at a preset position according to the circuit diagram.

And S3, interlocking the medium-voltage bus loop and the transformer feeder loop through a mechanical key.

In one embodiment of the present invention, a circuit diagram of a medium voltage bus loop of a conventional island medium voltage switchgear is shown in fig. 2, and a mechanical key may be configured at a preset position according to the circuit diagram of the medium voltage bus loop, which may include: the method comprises the steps of configuring a proving isolation key at a line breaker and a voltage transformer of a medium-voltage bus loop, configuring a permitted grounding key at a grounding switch of the medium-voltage bus, wherein the permitted grounding key is configured with a key exchange box.

Specifically, as shown in fig. 2, first, the proving isolation keys 1E and 2E may be configured in the line breaker and voltage transformer of the medium voltage bus loop, the bus grounding switch configuration allows the grounding key 3E while configuring the key exchange box, wherein the proving isolation key is released only when the breaker or isolation switch is removed from the operating position, or when the fixed breaker or switching device is fully opened, and the breaker or isolation switch cannot be inserted when the proving isolation key is removed; the grounding switch can be closed when the grounding permission key is inserted, and the grounding permission key can be released only when the grounding switch is opened. Secondly, when the incoming line breaker of the medium voltage bus loop is disconnected and the voltage transformer of the bus is withdrawn, two keys of the isolation keys 1E and 2E can be released, and the key of the grounding permission key 3E can be exchanged from the key exchange box. Finally, a permissible ground key 3E may be used to close the bus bar grounding switch.

In one embodiment of the present invention, a circuit diagram of a transformer feeder loop of a conventional island medium voltage switchgear is shown in fig. 3, and a mechanical key may be configured at a preset position according to the circuit diagram of the transformer feeder loop, which may include: the grounding key is arranged at the inlet wire power supply grounding switch of the feeder circuit of the transformer, and the grounding key is arranged at the cabinet door of the low-voltage transformer.

Specifically, as shown in fig. 3, first, a proving grounding key may be provided at the incoming line power ground switch of the low voltage transformer feeder loop, wherein the proving grounding key can be released only when the ground switch is closed. Secondly, when the incoming line power circuit breaker is opened, the incoming line power grounding switch is allowed to be closed, and the evidence grounding key is released. Finally, when it is verified that the grounding key is released, the access key can be used to open the low voltage transformer cabinet door and lock the access key in the low voltage transformer cabinet door, and only after the transformer cabinet door is closed, the access key can be taken out.

In another embodiment of the present invention, a circuit diagram of a transformer feeder loop of a conventional island medium voltage switchgear is shown in fig. 4, and a mechanical key may be configured at a preset position according to the circuit diagram of the transformer feeder loop, which may include: the method comprises the steps of configuring a proving isolation key at a breaker of a low-voltage incoming power supply of a transformer feeder circuit, configuring a proving grounding key at a grounding switch of the low-voltage incoming power supply of the transformer feeder circuit, and configuring an admission key at a cabinet door of the low-voltage transformer.

Specifically, as shown in fig. 4, first, the proof isolation key may be configured at the low-voltage power supply breaker, the low-voltage power supply configuration may prove the grounding key, and when the low-voltage power supply breaker is opened, the proof isolation key may be released. Secondly, when the isolation key is proved to be in the incoming line grounding switch and the incoming line power circuit breaker is disconnected, the incoming line grounding switch is allowed to be closed, and the proving grounding key is released. Finally, when it is verified that the grounding key is released, the access key can be used to open the low voltage transformer cabinet door and lock the access key in the low voltage transformer cabinet door.

According to the interlocking method of the conventional island medium voltage switch cabinet, provided by the embodiment of the invention, the circuit diagrams of the medium voltage bus loop and the transformer feeder loop of the conventional island medium voltage switch cabinet are obtained, the mechanical key is configured at the preset position according to the circuit diagrams, and finally the medium voltage bus loop and the transformer feeder loop are interlocked through the mechanical key, so that the problem caused by too far equipment distance in electric hard wiring interlocking can be solved, misoperation is avoided, and the interlocking reliability of the conventional island medium voltage switch cabinet can be improved.

In order to realize the interlocking method of the conventional island medium-voltage switch cabinet in the embodiment, the invention further provides an interlocking system of the conventional island medium-voltage switch cabinet.

As shown in fig. 5, an interlock system of a conventional island medium voltage switchgear according to an embodiment of the present invention includes: the device comprises an acquisition device 10, a configuration device 20 and an interlocking device 30, wherein the acquisition device 10 is used for acquiring a circuit diagram of a medium-voltage bus loop and a transformer feeder loop of a conventional island medium-voltage switch cabinet; the configuration means 20 are used for configuring the mechanical key at a preset position according to the circuit diagram; the interlock device 30 is used to interlock the medium voltage bus loop and the transformer feeder loop by means of a mechanical key.

In one embodiment of the present invention, the acquiring device 10 may acquire a circuit diagram of a medium voltage bus loop of a conventional island medium voltage switchgear, and as shown in fig. 2, the configuring device 20 may configure a mechanical key at a preset position according to the circuit diagram of the medium voltage bus loop, which may include: the method comprises the steps of configuring a proving isolation key at a line breaker and a voltage transformer of a medium-voltage bus loop, configuring a permitted grounding key at a grounding switch of the medium-voltage bus, wherein the permitted grounding key is configured with a key exchange box.

Specifically, as shown in fig. 2, first, the configuration device 20 may configure the proving isolation keys 1E and 2E in the line breaker and voltage transformer of the medium voltage bus loop, the bus grounding switch configuration allows the grounding key 3E, and simultaneously configures the key exchange box, wherein the proving isolation key can be released only when the breaker or the isolation switch is removed from the operation position, or when the fixed breaker or the switching device is completely opened, and the breaker or the isolation switch cannot be closed when the proving isolation key is removed, and the breaker cannot be inserted; the grounding switch can be closed when the grounding permission key is inserted, and the grounding permission key can be released only when the grounding switch is opened. Secondly, when the incoming line breaker of the medium voltage bus loop is disconnected and the voltage transformer of the bus is withdrawn, two keys of the isolation keys 1E and 2E can be released, and the key of the grounding permission key 3E can be exchanged from the key exchange box. Finally, a permissible ground key 3E may be used to close the bus bar grounding switch.

In one embodiment of the present invention, the obtaining device 10 may obtain a circuit diagram of a transformer feeder circuit of a conventional island medium voltage switchgear, and as shown in fig. 3, the configuring device 20 may configure a mechanical key at a preset position according to the circuit diagram of the transformer feeder circuit, which may include: the grounding key is arranged at the inlet wire power supply grounding switch of the feeder circuit of the transformer, and the grounding key is arranged at the cabinet door of the low-voltage transformer.

Specifically, as shown in fig. 3, first, the configuration device 20 may configure the proving grounding key at the incoming line power ground switch of the low voltage transformer feeder loop, wherein the proving grounding key can be released only when the grounding switch is closed. Secondly, when the incoming line power circuit breaker is opened, the incoming line power grounding switch is allowed to be closed, and the evidence grounding key is released. Finally, when it is verified that the grounding key is released, the access key can be used to open the low voltage transformer cabinet door and lock the access key in the low voltage transformer cabinet door, and only after the transformer cabinet door is closed, the access key can be taken out.

In another embodiment of the present invention, the obtaining device 10 may obtain a circuit diagram of a transformer feeder circuit of a conventional island medium voltage switchgear, and as shown in fig. 4, the configuring device 20 may configure a mechanical key at a preset position according to the circuit diagram of the transformer feeder circuit, which may include: the method comprises the steps of configuring a proving isolation key at a breaker of a low-voltage incoming power supply of a transformer feeder circuit, configuring a proving grounding key at a grounding switch of the low-voltage incoming power supply of the transformer feeder circuit, and configuring an admission key at a cabinet door of the low-voltage transformer.

Specifically, as shown in fig. 4, first, the configuration device 20 may configure the proof isolation key at the low-voltage power supply breaker, the low-voltage power supply configuration may prove the grounding key, and when the low-voltage power supply breaker is opened, the proof isolation key may be released. Secondly, when the isolation key is proved to be in the incoming line grounding switch and the incoming line power circuit breaker is disconnected, the incoming line grounding switch is allowed to be closed, and the proving grounding key is released. Finally, when it is verified that the grounding key is released, the access key can be used to open the low voltage transformer cabinet door and lock the access key in the low voltage transformer cabinet door.

According to the interlocking system of the conventional island medium voltage switch cabinet, the circuit diagrams of the medium voltage bus loop and the transformer feeder loop of the conventional island medium voltage switch cabinet are obtained through the obtaining device, the mechanical key is configured at the preset position through the configuration device, and finally the interlocking device is used for interlocking the medium voltage bus loop and the transformer feeder loop through the mechanical key, so that the problem caused by too far equipment distance in electric hard wiring interlocking can be solved, misoperation is avoided, and the interlocking reliability of the conventional island medium voltage switch cabinet can be improved.

In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (8)

1. An interlocking method of a conventional island medium-voltage switch cabinet is characterized by comprising the following steps of:

obtaining a circuit diagram of a medium-voltage bus loop and a transformer feeder loop of the conventional island medium-voltage switch cabinet;

configuring a mechanical key at a preset position according to the circuit diagram;

and interlocking the medium-voltage bus loop and the transformer feeder loop through the mechanical key.

2. The method of interlocking a conventional island medium voltage switchgear according to claim 1 wherein the mechanical key comprises a proof isolation key and a permitted ground key, wherein,

configuring the mechanical key at the preset position according to the circuit diagram includes: the proving isolation key is configured at a wire inlet breaker and a voltage transformer of the medium-voltage bus loop, and the permitted grounding key is configured at a grounding switch of the medium-voltage bus, wherein the permitted grounding key is configured with a key exchange box;

interlocking the medium voltage bus loop by the mechanical key comprises:

releasing the proof isolation key when the incoming line circuit breaker is disconnected and the voltage transformer is withdrawn, and exchanging the grounding-allowed key from the key exchange box;

and closing the bus grounding switch by using the grounding permission key.

3. The method of interlocking a conventional island medium voltage switchgear according to claim 1 wherein the mechanical key comprises a certified ground key and an admission key, wherein,

configuring the mechanical key at the preset position according to the circuit diagram includes: the proving grounding key is configured at a wire inlet power supply grounding switch of the transformer feeder circuit, and an admission key is configured at a cabinet door of the low-voltage transformer;

interlocking the medium voltage bus loop by the mechanical key comprises:

when a line incoming power supply breaker of the feeder circuit of the transformer is opened, allowing the line incoming power supply grounding switch to be closed, and releasing the evidence grounding key;

when the proving grounding key is released, the low-voltage transformer cabinet door is opened by using an access permission key, and the access permission key is locked in the low-voltage transformer cabinet door.

4. The method of interlocking a conventional island medium voltage switchgear according to claim 1 wherein the mechanical keys comprise a certified isolation key, a certified ground key and the permit access key, wherein,

configuring the mechanical key at the preset position according to the circuit diagram includes: the proving isolation key is configured at a breaker of a low-voltage incoming power supply of the transformer feeder circuit, the proving grounding key is configured at a grounding switch of the low-voltage incoming power supply of the transformer feeder circuit, and an admission key is configured at a cabinet door of the low-voltage transformer;

interlocking the transformer feeder loop with the mechanical key comprises:

releasing the proof isolation key when the breaker of the low-voltage incoming line power supply is disconnected;

when the proving isolation key is in the grounding switch of the low-voltage incoming line voltage and the breaker of the low-voltage incoming line power supply is switched off, the grounding switch of the low-voltage incoming line power supply is allowed to be closed, and the proving grounding key is released;

when the proving grounding key is released, the low-voltage transformer cabinet door is opened by using an access permission key, and the access permission key is locked in the low-voltage transformer cabinet door.

5. An interlock system for a conventional island medium voltage switchgear comprising:

the acquisition device is used for acquiring circuit diagrams of a medium-voltage bus loop and a transformer feeder loop of the conventional island medium-voltage switch cabinet;

configuration means for configuring a mechanical key at a preset position according to the circuit diagram;

and the interlocking device is used for interlocking the medium-voltage bus loop and the transformer feeder loop through the mechanical key.

6. The interlock system of a conventional island medium voltage switchgear of claim 5 wherein said mechanical keys comprise a proof isolation key and a permit ground key, wherein,

the configuring means configuring the mechanical key at the preset position according to the circuit diagram includes: the proving isolation key is configured at a wire inlet breaker and a voltage transformer of the medium-voltage bus loop, and the permitted grounding key is configured at a grounding switch of the medium-voltage bus, wherein the permitted grounding key is configured with a key exchange box;

the interlocking device interlocking the medium-voltage bus loop through the mechanical key comprises the following steps:

releasing the proof isolation key when the incoming line circuit breaker is disconnected and the voltage transformer is withdrawn, and exchanging the grounding-allowed key from the key exchange box;

and closing the bus grounding switch by using the grounding permission key.

7. The interlock system of claim 5 wherein said mechanical keys include a certified ground key and an access permit key wherein,

the configuring means configuring the mechanical key at the preset position according to the circuit diagram includes: the proving grounding key is configured at a wire inlet power supply grounding switch of the transformer feeder circuit;

the interlocking device interlocking the medium-voltage bus loop through the mechanical key comprises the following steps:

when a line incoming power supply breaker of the feeder circuit of the transformer is opened, allowing the line incoming power supply grounding switch to be closed, and releasing the evidence grounding key;

when the proving grounding key is released, the low-voltage transformer cabinet door is opened by using an access permission key, and the access permission key is locked in the low-voltage transformer cabinet door.

8. The interlock system of a conventional island medium voltage switchgear of claim 5 wherein said mechanical keys comprise a certified isolation key, a certified ground key and said permit access key, wherein,

the configuring means configuring the mechanical key at the preset position according to the circuit diagram includes: configuring the proving isolation key at a breaker of a low-voltage incoming power supply of the transformer feeder circuit, configuring the proving grounding key at a grounding switch of the low-voltage incoming power supply of the transformer feeder circuit, and configuring an admission key at a cabinet door of the low-voltage transformer;

the interlocking device interlocking the feeder circuit of the transformer through the mechanical key comprises:

releasing the proof isolation key when the breaker of the low-voltage incoming line power supply is disconnected;

when the proving isolation key is in the grounding switch of the low-voltage incoming line voltage and the breaker of the low-voltage incoming line power supply is switched off, the grounding switch of the low-voltage incoming line power supply is allowed to be closed, and the proving grounding key is released;

when the proving grounding key is released, the low-voltage transformer cabinet door is opened by using an access permission key, and the access permission key is locked in the low-voltage transformer cabinet door.