CN210156741U - A high-voltage switch cabinet power security system - Google Patents

Abstract

The utility model discloses a high tension switchgear power supply support system, the incoming line cabinet includes incoming line voltage transformer, incoming line current transformer and first circuit breaker module, incoming line voltage transformer, incoming line current transformer and first circuit breaker module connect gradually, first circuit breaker module is connected with the measurement cabinet through the high-voltage bus bar, the outgoing line cabinet includes second circuit breaker module, outgoing line current transformer and second zero sequence current transformer, second circuit breaker module, outgoing line current transformer and second zero sequence current transformer connect gradually, second circuit breaker module is connected with the measurement cabinet through the high-voltage bus bar, second zero sequence current transformer, transformer and UPS connect gradually, the input of manual converter can select to connect to the secondary side of incoming line voltage transformer or the output side of UPS, the output of manual converter is connected with the relay protector, first circuit breaker module and second circuit breaker module are controlled by the relay protector, the power supply can be recovered without a generator, and the operation is simple, convenient and quick.

Description

A high-voltage switch cabinet power security system

technical field

The utility model relates to the field of electric equipment, in particular to a power supply guarantee system for a high-voltage switch cabinet.

Background technique

After the power outage, the high-voltage switchgear often needs to be equipped with UPS or DC screen in order to maintain electric operation and relay protection; and the price of UPS is relatively cheap, so it is welcomed by the market; but if the power outage time exceeds the power that the UPS can supply Time, when the mains comes in, the circuit breaker will not automatically reclose; because of the cost problem, low-capacity voltage transformers are generally used in high-voltage switchgear, but low-capacity voltage transformers cannot be used for a long time. It is used for operation, relay protection and UPS power supply, so the power supply of UPS is supplied from the low-voltage side of the transformer through the air switch; so even if the mains comes in, the low-voltage side of the transformer is not charged, so the UPS cannot supply power, and the circuit breaker cannot automatically Reclosing, at this time, you need to bring your own generator to charge the UPS to restore power supply, which will bring inconvenience to operation and maintenance and power supply services.

Utility model content

The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide a high-voltage switchgear power supply guarantee system, which can restore power supply without bringing its own generator, reduces the time for restoring power supply, and is easy and convenient to operate. fast.

The technical scheme adopted by the utility model to solve its problems is:

The utility model provides a power supply guarantee system for a high-voltage switch cabinet, which includes primary equipment and secondary equipment. The primary equipment includes an incoming line cabinet, a metering cabinet, an outgoing line cabinet, a transformer and a high-voltage busbar, and the secondary equipment includes a UPS. , manual converter, relay protector, the incoming cabinet includes an incoming voltage transformer, an incoming current transformer and a first circuit breaker module, the incoming voltage transformer, the incoming current transformer and The first circuit breaker modules are connected in sequence, the first circuit breaker module is connected to the metering cabinet through the high-voltage busbar, and the outlet cabinet includes a second circuit breaker module, an outlet current transformer and a second zero sequencer Current transformer, the second circuit breaker module, the outgoing current transformer and the second zero-sequence current transformer are connected in sequence, and the second circuit breaker module is connected to the metering cabinet through the high-voltage busbar , the second zero-sequence current transformer, the transformer and the UPS are connected in sequence, and the input end of the manual converter can be selectively connected to the secondary side of the incoming line voltage transformer or the output of the UPS On the side, the output end of the manual converter is connected to the relay protector, and the first circuit breaker module and the second circuit breaker module are controlled by the relay protector.

Further, the relay protector includes a line integrated protection unit, a protection closing unit, a manual closing unit, a manual opening unit and a protection tripping unit.

Further, the first circuit breaker module and the second circuit breaker module include a vacuum circuit breaker opening and closing unit, and the power supply of the vacuum circuit breaker opening and closing unit is provided by a closing bus.

Further, the incoming line cabinet also includes a first zero-sequence current transformer, a first live display, and a surge arrester, and the first zero-sequence current transformer, the first live display, and the surge arrester are all connected to the incoming line. Current transformer connections.

Further, the measuring cabinet includes a measuring voltage transformer and a measuring current transformer, the measuring voltage transformer is connected with the measuring current transformer, and the input end of the measuring voltage transformer and the measuring current transformer are both connected with each other. The high voltage busbar is connected.

Further, the outlet cabinet includes a grounding knife switch and a second live display, and both the grounding switch and the second live display are connected to the outgoing current transformer.

Further, a miniature circuit breaker is also included, and the miniature circuit breaker is connected between the UPS and the transformer.

The embodiment in the utility model has the following beneficial effects: the high-voltage switch cabinet is composed of primary equipment and secondary equipment, and the secondary equipment can realize the control processing of the primary equipment; the incoming line voltage transformer in the incoming line cabinet is used as the incoming line voltage It is used to measure and judge whether there is voltage in the automatic switching device. The incoming line current transformer is used for incoming line current measurement. The first circuit breaker module is mainly used to connect or cut off the circuit, and has various protection functions for overload, open circuit and undervoltage. The metering cabinet is mainly used to measure voltage and current; the second circuit breaker module in the outlet cabinet is mainly used to connect or cut off the load circuit, the outlet current transformer can be used for relay protection, and the second zero-sequence current The transformer can realize protection and monitoring; the transformer can convert the voltage to a suitable range, the UPS can provide power for the relay protector, and the relay protector can monitor the high-voltage cabinet as a whole. The faulty circuit can be cut off immediately when the power failure occurs; when the duration of the power outage exceeds the duration of the power supply of the UPS, the power of the UPS will be consumed. The module and the second circuit breaker module are converted from the UPS power supply to the incoming line voltage transformer; when there is mains, the incoming line voltage transformer will also be charged, and then the relay protector, the first circuit breaker module, the second The circuit breaker module is also energized, and the relay protector controls the first circuit breaker module and the second circuit breaker module to reclose, so as to ensure the normal power supply of the entire circuit, and because the first circuit breaker module and the second circuit breaker module automatically reclose The operation time of the gate only takes a few seconds, which will not cause the incoming voltage transformer to be burned out; when the power supply is normal, control the manual converter to supply power to the relay protector, the first circuit breaker module, and the second circuit breaker module The power supply is switched to the UPS, which is easy and fast to operate; the operation and maintenance personnel do not need to bring their own generators to restore the power supply, which greatly reduces the time to restore the power supply, making the operation and maintenance more convenient and efficient; and only need to use a manual converter to achieve rapid Control, simple and practical, and cost-effective.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings and examples.

1 is a schematic diagram of a primary circuit of a high-voltage switchgear power supply security system provided by an embodiment of the present invention;

2 is a schematic diagram of a switching control secondary circuit of a high-voltage switchgear power supply security system provided by an embodiment of the present invention;

3 is a schematic diagram of a secondary circuit of a high-voltage switchgear power supply guarantee system provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

It should be noted that, if there is no conflict, various features in the embodiments of the present invention can be combined with each other, which are all within the protection scope of the present invention. In addition, although the functional modules are divided in the schematic diagram of the device, and the logical sequence is shown in the flowchart, in some cases, the modules in the device may be divided differently, or the sequence shown in the flowchart may be performed. or the described steps.

After the power outage, the high-voltage switchgear often needs to be equipped with UPS or DC screen in order to maintain electric operation and relay protection; and the price of UPS is relatively cheap, so it is welcomed by the market; but if the power outage time exceeds the power that the UPS can supply Time, when the mains comes in, the circuit breaker will not automatically reclose; because of the cost problem, low-capacity voltage transformers are generally used in high-voltage switchgear, but low-capacity voltage transformers cannot be used for a long time. It is used for operation, relay protection and UPS power supply, so the power supply of UPS is supplied from the low-voltage side of the transformer through the air switch; so even if the mains comes in, the low-voltage side of the transformer is not charged, so the UPS cannot supply power, and the circuit breaker cannot automatically Reclosing, at this time, you need to bring your own generator to charge the UPS to restore power supply, which will bring inconvenience to operation and maintenance and power supply services.

Based on this, the utility model provides a power supply guarantee system for a high-voltage switch cabinet, which can restore power supply without a self-contained generator, reduces the time for restoring power supply, and is easy and fast to operate.

The embodiments of the present utility model will be further described below with reference to the accompanying drawings.

1-2, an embodiment of the present utility model provides a high-voltage switchgear power supply security system, including primary equipment and secondary equipment, the primary equipment includes an incoming wire cabinet 100, a metering cabinet 200, an outgoing wire cabinet 300, a transformer 400 and a high voltage The busbar 10, the secondary equipment includes the UPS 500, the manual converter 600, the relay protector, the incoming cabinet 100 includes the incoming voltage transformer 130, the incoming current transformer 140 and the first circuit breaker module 110, and the incoming voltage mutual inductance The meter 130, the incoming current transformer 140 and the first circuit breaker module 110 are connected in sequence, the first circuit breaker module 110 is connected to the metering cabinet 200 through the high-voltage bus bar 10, and the outgoing cabinet 300 includes the second circuit breaker module 310, the outgoing current mutual inductance The circuit breaker 320 and the second zero-sequence current transformer 340, the second circuit breaker module 310, the outgoing current transformer 320 and the second zero-sequence current transformer 340 are connected in sequence, and the second circuit breaker module 310 is connected to the metering cabinet through the high-voltage bus bar 10 200 is connected, the second zero-sequence current transformer 340, the transformer 400 and the UPS 500 are connected in sequence, the input end of the manual converter 600 can be selected to be connected to the secondary side of the incoming voltage transformer 130 or the output side of the UPS 500, the manual converter 600 The output end of the circuit breaker is connected to a relay protector, and the first circuit breaker module 110 and the second circuit breaker module 310 are controlled by the relay protector. The high-voltage switchgear is composed of primary equipment and secondary equipment. The secondary equipment can control the primary equipment; the incoming voltage transformer 130 in the incoming line cabinet 100 is used for incoming line voltage measurement and for judging the automatic switching device. If there is no voltage, the incoming current transformer 140 is used for incoming current measurement, the first circuit breaker module 110 is mainly used to connect or cut off the circuit, and has various protection functions such as overload, circuit break, undervoltage protection, etc.; the metering cabinet 200 Mainly used to measure voltage and current; the second circuit breaker module 310 in the outlet cabinet 300 is mainly used to connect or cut off the load circuit, the outgoing current transformer 320 can be used for relay protection, and the second zero-sequence current transformer 340 can achieve protection and monitoring functions; transformer 400 can perform voltage conversion to convert the voltage to a suitable range, UPS500 can provide power for the relay protector, and the relay protector can monitor the high-voltage cabinet as a whole. The fault circuit can be cut off immediately when the power failure occurs; when the duration of the power failure exceeds the duration that the UPS500 can supply power, the power of the UPS500 is consumed. The circuit breaker module 110 and the second circuit breaker module 310 are powered by the UPS 500 and converted into power supply by the incoming voltage transformer 130; when there is commercial power, the incoming voltage transformer 130 will also be charged, and then the relay protector and the first circuit breaker The circuit breaker module 110 and the second circuit breaker module 310 are also charged, and the relay protector controls the first circuit breaker module 110 and the second circuit breaker module 310 to re-close, thereby ensuring the normal power supply of the entire circuit, and because the first circuit breaker The operation time of the automatic reclosing of the module 110 and the second circuit breaker module 310 is only a few seconds, which will not cause the incoming voltage transformer 130 to be burned out; when the power supply is normal, the manual converter 600 is controlled to switch the relay protector, The power supply of the first circuit breaker module 110 and the second circuit breaker module 310 is re-switched to the UPS 500, which is easy and fast to operate; the operation and maintenance personnel do not need to bring their own generators to restore the power supply, which greatly reduces the time for restoring the power supply and makes the operation and maintenance more efficient. Convenient and efficient; and only need to use a manual converter, you can achieve fast control, simple and practical, and cost-saving.

3 , the relay protector includes a line integrated protection unit 1100, a protection closing unit 1200, a manual closing unit 1300, a manual opening unit 1400, and a protection trip unit 1500. The line comprehensive protection unit 1100 is connected to the circuit to protect the abnormal conditions in the circuit, such as short circuit, open circuit and lack of equality, so that the circuit can operate normally; the protection closing unit 1200 is used to protect the reclosing. The protection trip unit 1500 is used to disconnect the fault circuit, so that other parts of the circuit can continue to operate normally; the manual closing unit 1300 is mainly used for maintenance personnel to connect the circuit, and the manual opening unit The 1400 is mainly used by maintenance personnel to disconnect circuits.

Further, the first circuit breaker module 110 and the second circuit breaker module 310 include a vacuum circuit breaker opening and closing unit 2000, and the power supply of the vacuum circuit breaker opening and closing unit 2000 is provided by a closing bus. The power supply of the vacuum circuit breaker opening and closing unit 2000 is provided by the closing bus, so that the closing bus can be used to supply power to the vacuum circuit breaker opening and closing unit 2000, so that the vacuum circuit breaker opening and closing unit 2000 can switch on the circuit Or cut off processing.

The incoming cabinet 100 further includes a first zero-sequence current transformer 120, a first live display 160 and a surge arrester 150. The first zero-sequence current transformer 120, the first live display 160 and the surge arrester 150 are all connected to the incoming current transformer 140 connections. The first zero-sequence current transformer 120 can achieve protection and monitoring functions; the first live display 160 can be lit when energized, giving maintenance personnel a more intuitive display; the arrester 150 can protect the high-voltage switchgear from being struck by lightning, making high-voltage The cabinet can operate more safely.

The metering cabinet 200 includes a metering voltage transformer 210 and a metering current transformer 220, the metering voltage transformer 210 is connected to the metering current transformer 220, and the input end of the metering voltage transformer 210 and the metering current transformer 220 are connected to the high voltage The busbar 10 is connected. The metering voltage transformer 210 and the metering current transformer 220 can respectively provide voltage and current to the electric energy meter.

The outlet cabinet 300 includes a grounding knife switch 330 and a second live display 350 , both of which are connected to the outgoing current transformer 320 . The grounding knife switch 330 is mainly used to ensure the personal safety of maintenance personnel on the line as much as possible when misoperation occurs. The second electrification display 350 also gives maintenance personnel a more intuitive display.

Further, a miniature circuit breaker 510 is also included, and the miniature circuit breaker 510 is connected between the UPS 500 and the transformer 400 . The miniature circuit breaker 510 is connected between the UPS 500 and the transformer 400, so that the transformer 400 can be prevented from being damaged due to excessive current, so that the circuit operation is more secure.

The above is a specific description of the preferred implementation of the present utility model, but the present utility model is not limited to the above-mentioned embodiments, and those skilled in the art can also make various equivalent deformations or Alternatives, these equivalent modifications or substitutions are all included within the scope defined by the claims of the present application.

Claims (7)

1. A high-voltage switchgear power supply security system, characterized in that: it comprises primary equipment and secondary equipment, and the primary equipment comprises an incoming line cabinet (100), a metering cabinet (200), an outgoing line cabinet (300), a transformer (400) ) and a high-voltage busbar (10), the secondary equipment includes a UPS (500), a manual converter (600), and a relay protector, and the incoming line cabinet (100) includes an incoming line voltage transformer (130), Incoming line current transformer (140) and first circuit breaker module (110), said incoming line voltage transformer (130), said incoming line current transformer (140) and said first circuit breaker module (110) connected in sequence, the first circuit breaker module (110) is connected to the metering cabinet (200) through the high-voltage busbar (10), and the outlet cabinet (300) includes a second circuit breaker module (310), an outlet A current transformer (320) and a second zero-sequence current transformer (340), the second circuit breaker module (310), the outgoing current transformer (320) and the second zero-sequence current transformer (340) ) are connected in sequence, the second circuit breaker module (310) is connected to the metering cabinet (200) through the high-voltage busbar (10), the second zero-sequence current transformer (340), the transformer ( 400) and the UPS (500) are sequentially connected, and the input end of the manual converter (600) can be selectively connected to the secondary side of the incoming voltage transformer (130) or the output of the UPS (500). side, the output end of the manual converter (600) is connected to the relay protector, and the first circuit breaker module (110) and the second circuit breaker module (310) are controlled by the relay protector. 2. A high-voltage switchgear power supply guarantee system according to claim 1, characterized in that: the relay protector comprises a line comprehensive protection unit (1100), a protection closing unit (1200), a manual closing unit ( 1300), manual opening unit (1400) and protection trip unit (1500). 3. A high-voltage switchgear power security system according to claim 2, characterized in that: the first circuit breaker module (110) and the second circuit breaker module (310) comprise vacuum circuit breaker opening and closing A unit (2000), the power supply of the vacuum circuit breaker opening and closing unit (2000) is provided by the closing busbar. 4. A high-voltage switchgear power supply guarantee system according to claim 1, characterized in that: the incoming line cabinet (100) further comprises a first zero-sequence current transformer (120), a first live display (160) and a surge arrester (150), the first zero-sequence current transformer (120), the first live display (160) and the surge arrester (150) are all connected to the incoming line current transformer (140). 5. A high-voltage switchgear power supply guarantee system according to claim 1, characterized in that: the metering cabinet (200) comprises a metering voltage transformer (210) and a metering current transformer (220), and the metering voltage transformer (220) The transformer (210) is connected to the measuring current transformer (220), and the input end of the measuring voltage transformer (210) and the measuring current transformer (220) are both connected to the high-voltage busbar (10) . 6. A high-voltage switch cabinet power supply guarantee system according to claim 1, characterized in that: the outlet cabinet (300) comprises a grounding knife switch (330) and a second live display (350), and the grounding knife switch (350) (330) and the second charged display (350) are both connected to the outgoing current transformer (320). 7. A high-voltage switchgear power supply guarantee system according to claim 1, characterized in that: further comprising a miniature circuit breaker (510), wherein the miniature circuit breaker (510) is connected to the UPS (500) and the between the transformers (400).

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