CN215817488U - Machine room power distribution system with double circuit breaking protection - Google Patents
Machine room power distribution system with double circuit breaking protection Download PDFInfo
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- CN215817488U CN215817488U CN202122352654.9U CN202122352654U CN215817488U CN 215817488 U CN215817488 U CN 215817488U CN 202122352654 U CN202122352654 U CN 202122352654U CN 215817488 U CN215817488 U CN 215817488U
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Abstract
The utility model provides a machine room power distribution system with double circuit-breaking protection, which comprises a human-computer interaction device, a power distribution cabinet and a plurality of power utilization cabinets, wherein a power distribution unit is arranged in the power distribution cabinet, a molded case circuit breaker and a plurality of power utilization loads which are connected in parallel and then are electrically connected with the power distribution unit through the molded case circuit breaker are arranged in each power utilization cabinet, each power utilization load is connected with an air switch in series, each switch state monitoring device comprises a current-limiting resistor, a sampling resistor, a current sensor and a relay switch, each relay switch comprises a coil and a normally closed contact, the human-computer interaction device is respectively and electrically connected with each current sensor, and each switch state monitoring device comprises: the coil and the corresponding air switch are mutually connected in series, the input end of the current-limiting resistor is connected with the total output end after the series connection, and the output end of the current-limiting resistor is grounded; the normally closed contact and the sampling resistor are mutually connected in series, the total input end after the series connection is connected with the input end of the corresponding air switch, and the total output end is grounded; the current sensor is connected with the sampling end of the sampling resistor.
Description
Technical Field
The utility model relates to the technical field of power distribution cabinets, in particular to a machine room power distribution system with double circuit breaking protection.
Background
The power distribution cabinet is a general name of a motor control center and is used for distributing electric energy of upper-stage power distribution equipment to lower-stage power loads. At present, computer lab Distribution system includes a switch board and a plurality of Power consumption rack usually, be equipped with in the switch board and be used for distributing the Power Distribution Unit (Power Distribution Unit, PDU) to each Power consumption rack, be equipped with a moulded case circuit breaker and a plurality of parallelly connected Power consumption load each other in every Power consumption rack, a plurality of Power consumption load connect the Power Distribution Unit through moulded case circuit breaker electricity after parallelly connected each other, wherein every Power consumption load has concatenated an air switch, in every Power consumption rack, moulded case circuit breaker's trip settlement electric current is greater than any air switch's trip settlement electric current, just so can utilize moulded case circuit breaker and air switch to realize the double circuit breaker protection to Power consumption load, specifically: when a certain electric load has a short-circuit fault and the input current of the certain electric load exceeds the tripping set current of the air switch connected in series with the electric load, the air switch connected in series with the electric load can be automatically switched off, so that the electric load with the short-circuit fault stops working to avoid accidents, and other electric loads continue to be powered on to work; when the input current of a certain power consumption cabinet exceeds the tripping set current of the molded case circuit breaker in the power consumption cabinet, the molded case circuit breaker in the power consumption cabinet can be automatically disconnected, so that the power consumption cabinet is integrally not taken from the power distribution unit any more, and all power consumption loads in the power consumption cabinet stop working to avoid accidents.
After the short-circuit fault power consumption load stops working, maintenance personnel need to maintain the short-circuit fault power consumption load in time, therefore, the current machine room power distribution system usually sets up current sensor at each power consumption load's input, utilizes current sensor's testing result to judge whether the short-circuit fault occurs to the power consumption load, specifically: when the electric load works normally, the corresponding current sensor detects the working current of the electric load, so that the corresponding air switch can be judged not to be disconnected, namely the electric load has no short-circuit fault; when a certain electric load has a short-circuit fault and the corresponding air switch is automatically switched off, the corresponding current sensor cannot detect the current, so that the corresponding air switch can be judged to be automatically switched off, and the electric load with the short-circuit fault can be found by using the detection result of the current sensor.
However, the electrical load is usually provided with a load switch, when a certain electrical load does not need to be put into use, a user can manually operate the load switch to power off and stop working the electrical load, and at the moment, the electrical load does not have a short-circuit fault, so that the air switch of the electrical load is not disconnected, but the current sensor cannot detect working current due to the power off of the electrical load, and thus the corresponding air switch can be automatically disconnected by misjudgment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of how to avoid the problem that maintenance personnel misjudge the automatic disconnection of an air switch in a machine room power distribution system.
In order to solve the technical problems, the utility model provides a machine room power distribution system with double circuit-breaking protection, which comprises a power distribution cabinet and a plurality of power utilization cabinets, wherein a power distribution unit for distributing power to each power utilization cabinet is arranged in the power distribution cabinet, a molded case circuit breaker and a plurality of power utilization loads which are mutually connected in parallel are arranged in each power utilization cabinet, the plurality of power utilization loads are electrically connected with the power distribution unit through the molded case circuit breaker after being mutually connected in parallel, each power utilization load is connected with an air switch in series and comprises a human-computer interaction device and a plurality of switch state monitoring devices, the plurality of switch state monitoring devices are respectively used for monitoring the opening and closing state of each air switch, each switch state monitoring device comprises a current-limiting resistor, a sampling resistor, a current sensor and a relay switch, the relay switch comprises a coil and a normally closed contact, the human-computer interaction device is respectively and electrically connected with the current sensor of each switch state monitoring device, in each switch state monitoring device: the coil and the air switch which is correspondingly monitored are mutually connected in series, the input end of the current-limiting resistor is connected with the coil and the total output end of the air switch which are mutually connected in series, and the output end of the current-limiting resistor is grounded; the normally closed contact and the sampling resistor are connected in series, the total input end of the normally closed contact and the sampling resistor which are connected in series is connected with the input end of the air switch which is correspondingly monitored, and the total output end of the normally closed contact and the sampling resistor which are connected in series is grounded; the current sensor is connected with the sampling end of the sampling resistor.
Preferably, the human-computer interaction device comprises a controller and a touch screen which are electrically connected with each other, and the controller is electrically connected with the current sensors of the switch state monitoring devices respectively.
Preferably, the controller is a PLC controller
Preferably, in each of the electric cabinets, the trip set current of the molded case circuit breaker is greater than that of any one of the air switches.
Preferably, each electric cabinet is provided with a surge protector connected with the output end of the molded case circuit breaker.
The utility model has the following beneficial effects:
under normal operating condition, each molded case circuit breaker and each air switch are closed, so that power current is firstly distributed by the power distribution unit, flows through the closed molded case circuit breakers respectively and is input into each power utilization cabinet, then flows through each closed air switch and each relay switch coil in the power utilization cabinet and is supplied to a power load and a current-limiting resistor respectively, so that each power load works with electricity, the relay switch coils which are connected with each air switch in series respectively are powered on, the normally closed contact of the relay switch is disconnected, therefore, the power current cannot flow through the disconnected normally closed contact and is supplied to the sampling resistor, the current sensor cannot detect that current flows through the sampling resistor, and therefore, an alarm signal cannot be sent to the man-machine interaction device.
When a certain electric load does not need to be put into use, a user can manually operate a load switch to enable the electric load to be powered off and stop working, at the moment, the electric load has no short-circuit fault, so that an air switch connected in series with the electric load cannot be automatically switched off, so that the power current continuously flows through the corresponding air switch and a relay switch coil to supply a current-limiting resistor, so that the relay switch coil is continuously powered on, the normally closed contact of the relay switch is kept disconnected, so that the power current cannot still flow through the disconnected normally closed contact to supply a sampling resistor, at the moment, the current sensor cannot detect that the current flows through the sampling resistor, and therefore an alarm signal cannot be sent to the man-machine interaction device.
When a certain electric load has a short-circuit fault and the input current of the certain electric load exceeds the tripping set current of the air switch connected in series with the electric load, the air switch connected in series with the electric load can be automatically switched off, so that the electric load is powered off and stops working to avoid accidents, the relay switch coil connected in series with the air switch can be powered off at the moment, the normally closed contact of the relay switch is recovered to a closed state, the power current can flow through the closed normally closed contact to supply to the sampling resistor, the current sensor detects that the current flows through the sampling resistor at the moment, a corresponding alarm signal is sent to the human-computer interaction device according to the current, and the human-computer interaction device displays relevant information of the electric load with the short-circuit fault after receiving the alarm signal and checks the information for maintenance personnel.
In conclusion, when the power distribution system of the house works normally and the power load is powered off manually by a user, the air switch is not automatically switched off, the current sensor cannot send an alarm signal to the man-machine interaction device at the moment, and the man-machine interaction device cannot display relevant information of short-circuit faults of the power load; when a certain electric load has a short-circuit fault, the air switch connected in series with the electric load is automatically switched off, the current sensor sends an alarm signal to the man-machine interaction device, and the man-machine interaction device can display relevant information of the short-circuit fault of the electric load to be checked by maintenance personnel after receiving the alarm information. Therefore, the power distribution system of the house can avoid the maintenance personnel from misjudging the automatic disconnection of the air switch.
Drawings
FIG. 1 is a schematic circuit connection diagram of a double break protected room power distribution system;
fig. 2 is a schematic circuit connection diagram of the switch state monitoring device connected with the electric cabinet.
Description of reference numerals: 1-a power distribution cabinet; 2-electric cabinet; 3-a power distribution unit; 4-power load; 5-an air switch; 6-molded case circuit breaker; 7-a human-computer interaction device; 8-a switch state monitoring device; 9-current limiting resistor; 10-sampling resistance; 11-a current sensor; 12-a coil; 13-a normally closed contact; 14-surge protector.
Detailed Description
The utility model is described in further detail below with reference to specific embodiments.
The machine room power distribution system with double circuit breaking protection is shown in fig. 1 and comprises a power distribution cabinet 1, two power utilization cabinets 2 and a human-computer interaction device 7, wherein the power utilization cabinets 2 are provided with two power sources, the power distribution cabinet 1 distributes power sources for the two power utilization cabinets 2, and the human-computer interaction device 7 is electrically connected with the two power utilization cabinets 2.
A Power Distribution Unit 3(Power Distribution Unit, PDU for short) is arranged in the Power Distribution cabinet 1, the Power Distribution Unit 3 is used for distributing Power to each Power utilization cabinet 2, and each Power utilization cabinet 2 is provided with three Power loads 4, three air switches 5, a molded case circuit breaker 6 and a surge protector 14. In each electric cabinet 2, three electric loads 4 are connected in parallel and then electrically connected with a power distribution unit 3 of the power distribution cabinet 1 through a molded case circuit breaker 6, wherein each electric load 4 is connected with an air switch 5 in series, and a surge protector 14 is connected with the output end of the molded case circuit breaker 6. The surge protector 14 is also called a lightning protector, and when the electrical loop of the power consumption cabinet 2 suddenly generates peak current or voltage due to external interference, the surge protector 14 can conduct and shunt in a very short time, so that damage to the power consumption load 4 in the electrical loop of the power consumption cabinet 2 due to surge is avoided.
In every power consumption rack 2, moulded case circuit breaker 6's trip settlement electric current is greater than any air switch 5's trip settlement electric current, just so can utilize moulded case circuit breaker 6 and air switch 5 to realize the dual protection of opening circuit to power consumption load 4, specifically: when a certain electric load 4 has a short-circuit fault and the input current exceeds the tripping set current of the air switch 5 connected in series with the electric load 4, the air switch 5 connected in series with the electric load 4 is automatically switched off to cut off the current, so that the electric load 4 with the short-circuit fault stops working to avoid accidents, and other electric loads 4 continue to be powered on to work; when the input current of a certain power consumption cabinet 2 exceeds the tripping set current of the molded case circuit breaker 6 in the power consumption cabinet 2, the molded case circuit breaker 6 in the power consumption cabinet 2 is automatically disconnected to cut off the current, so that the power consumption cabinet 2 is not required to be wholly taken from the power distribution unit 3, and the whole power consumption loads 4 in the power consumption cabinet 2 stop working to avoid accidents.
Referring to fig. 2, three on-off state monitoring devices 8 are disposed in each of the electric cabinets 2, and the three on-off state monitoring devices 8 are respectively used for monitoring the on-off state of each air switch 5. Each switch state monitoring device 8 comprises a current limiting resistor 9, a sampling resistor 10, a current sensor 11 and a relay switch, wherein the relay switch comprises a coil 12 and a normally closed contact 13, and the human-computer interaction device 7 is electrically connected with the current sensors 11 of the switch state monitoring devices 8 respectively.
In each switch state monitoring device 8: the coil 12 and the air switch 5 which is correspondingly monitored are mutually connected in series, the input end of the current limiting resistor 9 is connected with the coil 12 and the total output end of the air switch 5 which are mutually connected in series, and the output end of the current limiting resistor 9 is grounded; the normally closed contact 13 and the sampling resistor 10 are connected in series, the total input end of the normally closed contact 13 and the sampling resistor 10 which are connected in series is connected with the input end of the air switch 5 which is correspondingly monitored, and the total output end of the normally closed contact 13 and the sampling resistor 10 which are connected in series is grounded; the current sensor 11 is connected with the sampling end of the sampling resistor 10. The current sensor 11 is a current detection device, which can detect the current information of the sampling resistor 10, and can convert the detected current information into an electrical signal meeting a certain standard requirement or other required form information output according to a certain rule, so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like.
In this embodiment, the human-computer interaction device 7 includes a Controller and a touch screen (both not shown in the drawings) electrically connected to each other, the Controller is a PLC Controller (Programmable Logic Controller), and the Controller is electrically connected to the current sensors 11 of the switch state monitoring devices 8 respectively, so as to obtain the detection data of the current sensors 11 and display the detection data to the maintenance personnel through the touch screen for viewing.
Under the normal operating condition of the machine room power distribution system, each molded case circuit breaker 6 and each air switch 5 are closed, so that the power current is firstly distributed by the power distribution unit 3, respectively flows through the two closed molded case circuit breakers 6 and is input into the two power utilization cabinets 2, then flows through each closed air switch 5 and the relay switch coil 12 in the power utilization cabinets 2 and is respectively supplied to the power loads 4 and the current-limiting resistor 9, so that each power load 4 works in an electrified manner, the relay switch coil 12 of each air switch 5 is connected in series to be electrified, so that the normally closed contact 13 of the relay switch is disconnected, therefore, the power current cannot flow through the disconnected normally closed contact 13 and is supplied to the sampling resistor 10, at the moment, the current sensor 11 cannot detect that the current flows through the sampling resistor 10, and therefore, the alarm signal cannot be sent to the human-computer interaction device 7.
When a certain electric load 4 does not need to be put into use, a user can manually operate a load switch to enable the electric load 4 to be powered off and stop working, at the moment, the electric load 4 has no short-circuit fault, so that the air switch 5 connected in series with the electric load 4 cannot be automatically switched off, the power current continues to flow through the corresponding air switch 5 and the relay switch coil 12 to supply the current-limiting resistor 9, the relay switch coil 12 continues to be powered on, the normally closed contact 13 of the relay switch is kept switched off, the power current still cannot flow through the switched-off normally closed contact 13 to supply the sampling resistor 10, at the moment, the current sensor 11 still cannot detect that the current flows through the sampling resistor 10, and therefore an alarm signal cannot be sent to the human-computer interaction device 7.
When a certain electric load 4 has a short-circuit fault and the input current exceeds the tripping set current of the air switch 5 connected in series, the air switch 5 connected in series with the electric load 4 can be automatically switched off, so that the electric load 4 is powered off and stops working to avoid accidents, at the moment, the relay switch coil 12 connected in series with the air switch 5 can be powered off, the normally closed contact 13 of the relay switch is recovered to a closed state, thus, the power current is supplied to the sampling resistor 10 through the closed normally closed contact 13, and the current sensor 11 detects that the current flows through the sampling resistor 10, and accordingly sends a corresponding alarm signal to the controller of the human-computer interaction device 7, after the controller of the human-computer interaction device 7 receives the alarm signal, and displaying relevant information of the short-circuit fault of the power utilization load 4 to a maintenance worker for checking through the touch screen.
To sum up, when the power distribution system of the house normally works and a user manually operates the load switch to power off the electric load 4, the air switch 5 is not automatically switched off, at the moment, the current sensor 11 cannot send an alarm signal to the human-computer interaction device 7, and the human-computer interaction device 7 cannot display relevant information of short-circuit faults of the electric load 4; when a certain electric load 4 has a short-circuit fault, the air switch 5 connected in series with the electric load 4 is automatically switched off, at the moment, the current sensor 11 sends an alarm signal to the man-machine interaction device 7, and the man-machine interaction device 7 can display relevant information of the electric load 4 having the short-circuit fault for maintenance personnel to check after receiving the alarm information. Therefore, the power distribution system of the house can avoid the maintenance personnel from misjudging that the air switch 5 is automatically switched off.
In other embodiments, the number of the power cabinets 2 of the local house power distribution system may be set to other numbers of more than two, such as 3, 4, 5 … …; the number of the electric loads 4 in each electric cabinet 2 may also be set to other numbers, such as 2, 4, 5 … …, so that the corresponding air switch 5 in each electric cabinet 2 needs to be set to the number of the electric loads 4.
The above description is only the embodiments of the present invention, and the scope of protection is not limited thereto. The insubstantial changes or substitutions will now be made by those skilled in the art based on the teachings of the present invention, which fall within the scope of the claims.
Claims (5)
1. Double circuit-breaking protection's computer lab distribution system, including switch board (1) and a plurality of power consumption rack (2), be equipped with in switch board (1) and be used for distributing the power to power distribution unit (3) of each power consumption rack (2), be equipped with moulded case circuit breaker (6) and a plurality of parallelly connected power consumption load (4) each other in every power consumption rack (2), a plurality of power consumption load (4) are parallelly connected the back warp each other moulded case circuit breaker (6) electricity is connected power distribution unit (3), wherein every power consumption load (4) have concatenated an air switch (5), characterized by, including human-computer interaction device (7) and a plurality of on-off state monitoring devices (8), a plurality of on-off state monitoring devices (8) are used for monitoring the state that opens and shuts of each air switch (5) respectively, and every on-off state monitoring device (8) include current-limiting resistor (9), Sampling resistance (10), current sensor (11) and relay switch, relay switch includes coil (12) and normally closed contact (13), current sensor (11) of each on-off state monitoring devices (8) are connected to man-machine interaction device (7) electricity respectively, in every on-off state monitoring devices (8): the coil (12) and the air switch (5) which is correspondingly monitored are mutually connected in series, the input end of the current limiting resistor (9) is connected with the coil (12) and the total output end of the air switch (5) which are mutually connected in series, and the output end of the current limiting resistor (9) is grounded; the normally closed contact (13) and the sampling resistor (10) are connected in series, the total input end of the normally closed contact (13) and the sampling resistor (10) which are connected in series is connected with the input end of the air switch (5) which is correspondingly monitored, and the total output end of the normally closed contact (13) and the sampling resistor (10) which are connected in series is grounded; the current sensor (11) is connected with the sampling end of the sampling resistor (10).
2. The machine room power distribution system of claim 1, wherein the human-computer interaction device (7) comprises a controller and a touch screen which are electrically connected with each other, and the controller is electrically connected with the current sensor (11) of each switch state monitoring device (8) respectively.
3. The machine room power distribution system of claim 2, wherein the controller is a PLC controller.
4. The machine room power distribution system of claim 1, wherein in each of the power utilization cabinets (2), the trip set current of the molded case circuit breaker (6) is larger than that of any one of the air switches (5).
5. A machine room power distribution system according to claim 1, wherein each cabinet (2) is provided with a surge protector (14) connected to the output of the molded case circuit breaker (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122352654.9U CN215817488U (en) | 2021-09-27 | 2021-09-27 | Machine room power distribution system with double circuit breaking protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122352654.9U CN215817488U (en) | 2021-09-27 | 2021-09-27 | Machine room power distribution system with double circuit breaking protection |
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| Publication Number | Publication Date |
|---|---|
| CN215817488U true CN215817488U (en) | 2022-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122352654.9U Active CN215817488U (en) | 2021-09-27 | 2021-09-27 | Machine room power distribution system with double circuit breaking protection |
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|---|---|
| CN (1) | CN215817488U (en) |
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2021
- 2021-09-27 CN CN202122352654.9U patent/CN215817488U/en active Active
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