Power-loss monitoring system for direct-current power supply of 10kV equipment in electrolytic aluminum industry

Abstract

The invention discloses a power loss monitoring system for a direct-current power supply of 10kV equipment in the electrolytic aluminum industry, and relates to the technical field of electrolytic aluminum. The system comprises a rectification transformer substation machine room assembly, a first power supply module, a wireless transmitting device and a relay. The first power supply module is connected with three-phase power; the first power supply module is connected with the wireless transmitting device through a normally open contact of the relay; a coil of the relay is connected with the direct-current bus; the wireless transmitting device is connected with the rectification transformer substation machine room assembly. The rectification transformer substation machine room assembly sends out an alarm signal when receiving of the signal of the wireless sending device is interrupted; signal interruption of the wireless transmitting device is caused by disconnection of a normally open contact of the relay; disconnection of the normally open contact of the relay is caused by power loss of a direct-current bus connected with a coil of the relay; the power loss of the DC bus is caused by the abnormity of the rectifier module. By arranging the relay, an alarm signal can be sent out when the direct-current power supply disappears due to the fault of the direct-current system.

Description

Technical Field

[0001] The invention relates to the technical field of electrolytic aluminum, and in particular to a direct current power failure monitoring system for 10kV equipment in the electrolytic aluminum industry. Background Art

[0002] There are several 10kV distribution rooms in the electrolytic aluminum rectifier substation. The DC power supply plays a very important role in the 10kV system. The control circuit, protection device and metering instrument of the 10kV high-voltage switch cabinet are all powered by the DC power supply. Once the DC power supply has problems and the DC power disappears, the protection device, control circuit and metering system of the high-voltage switch cabinet will fail. At this time, the protection device cannot work and the switch refuses to work, which is very dangerous. Because many DC panels will also have problems with their own monitoring systems when they fail, their inherent alarm communication systems are not stable. Summary of the invention

[0003] The purpose of the present invention is to provide a DC power failure monitoring system for 10kV equipment in the electrolytic aluminum industry, which can send out an alarm signal when a DC system failure causes the DC power to disappear.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A 10kV equipment DC power failure monitoring system for the electrolytic aluminum industry, wherein the 10kV equipment DC power failure monitoring system for the electrolytic aluminum industry is applied to a 10kV power distribution component;

[0006] The 10kV power distribution assembly includes a plurality of rectifier modules; the rectifier modules are respectively connected to the three-phase power and the DC bus; the DC bus is connected to a plurality of electrical devices; a fuse is provided between the rectifier module and the three-phase power; the rectifier module is used to convert the three-phase power voltage into 220V and supply power through the DC bus;

[0007] The 10kV DC power failure monitoring system for electrolytic aluminum industry equipment includes:

[0008] Distribution room detection components and rectifier substation room components;

[0009] The power distribution room detection component comprises:

[0010] A first power module, a wireless transmission device and a relay;

[0011] The first power module is electrically connected to the three-phase power supply; the first power module and the wireless transmitting device are connected via the normally open contact of the relay;

[0012] The coil of the relay is connected to the DC bus;

[0013] The wireless transmission device is connected to the rectifier substation room component;

[0014] The rectifier substation room component sends out an alarm signal when the signal received by the wireless transmitting device is interrupted; the signal interruption of the wireless transmitting device is caused by the disconnection of the normally open contact of the relay; the disconnection of the normally open contact of the relay is caused by the loss of power to the DC bus connected to the coil of the relay; the loss of power to the DC bus is caused by the abnormality of the rectifier module.

[0015] Optionally, the first power module is a 24V power module.

[0016] Optionally, the 10kV equipment DC power failure monitoring system for the electrolytic aluminum industry further includes:

[0017] Remote control room host computer;

[0018] The remote control room host computer is connected to the rectifier substation room components; the remote control room host computer is used to receive alarm signals.

[0019] Optionally, the rectifier substation room components include:

[0020] Wireless receiving device and PLC;

[0021] The wireless receiving device is connected to the PLC and the wireless transmitting device respectively;

[0022] The wireless receiving device is used to receive signals from the wireless transmitting device;

[0023] The PLC is used to generate an alarm signal when the signal received from the wireless transmitting device is interrupted.

[0024] Optionally, the rectifier substation room component further includes: a second power supply module;

[0025] The second power supply module is connected to three-phase electricity and the wireless receiving device respectively.

[0026] Optionally, the second power supply module is a 24V power supply module.

[0027] Optionally, the rectifier substation room components further include: an industrial Ethernet switch;

[0028] The industrial Ethernet switch is connected to the PLC and the remote control room host computer respectively; the industrial Ethernet switch is used to transmit the alarm signal to the remote control room host computer.

[0029] Optionally, the communication mode between the PLC and the industrial Ethernet switch is PROFINET.

[0030] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0031] The present invention provides a 10kV DC power failure monitoring system for electrolytic aluminum industry equipment. When the DC power failure in the 10kV power distribution room is detected, an upper computer can immediately detect and send out an alarm to light up a monitoring screen light sign to remind the operation personnel on duty in the main control room, thereby truly realizing danger prediction and improving work efficiency. The DC power system alarm signal is transmitted through a wireless device, which saves a lot of cable laying, money, manpower and material resources. When many DC panels fail, their own monitoring systems are not stable. Designing a stable system for monitoring the DC power supply voltage can avoid the problem that the main control room on duty cannot receive messages when the DC power disappears due to a DC system failure, thereby allowing the operation personnel on duty to respond quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a 10kV DC power failure monitoring system for electrolytic aluminum industry equipment provided in Example 1 of the present invention;

[0034] Figure 2 This is a schematic diagram of the layout of the DC power failure monitoring system for 10kV equipment in the electrolytic aluminum industry provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The purpose of the present invention is to provide a DC power failure monitoring system for 10kV equipment in the electrolytic aluminum industry, which can send out an alarm signal when a DC system failure causes the DC power to disappear.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example

[0039] like Figure 1 As shown, in this embodiment, a 10kV equipment DC power failure monitoring system for the electrolytic aluminum industry is applied to a 10kV power distribution component; the 10kV power distribution component includes a plurality of rectifier modules; the rectifier modules are respectively connected to the three-phase power and the DC bus; the DC bus is connected to a plurality of electrical devices; a fuse is provided between the rectifier module and the three-phase power; the rectifier module is used to convert the three-phase power voltage into 220V and supply power through the DC bus;

[0040] The 10kV equipment DC power failure monitoring system in the electrolytic aluminum industry includes: a distribution room detection component and a rectifier substation room component; the distribution room detection component includes: a first power module, a wireless transmitter and a relay; the first power module is connected to the three-phase electricity; the first power module and the wireless transmitter are connected through the normally open contact of the relay; the coil of the relay is connected to the DC bus; the wireless transmitter is connected to the rectifier substation room component; the rectifier substation room component sends an alarm signal when the signal received by the wireless transmitter is interrupted; the signal interruption of the wireless transmitter is caused by the disconnection of the normally open contact of the relay; the disconnection of the normally open contact of the relay is caused by the loss of power of the DC bus connected to the coil of the relay; the loss of power of the DC bus is caused by the abnormality of the rectifier module. The first power module is a 24V power module.

[0041] The 10kV equipment DC power failure monitoring system in the electrolytic aluminum industry also includes: a remote control room host computer; the remote control room host computer is connected to the components in the rectifier substation room; the remote control room host computer is used to receive alarm signals.

[0042] The components of the rectifier substation room include: a wireless receiving device and a PLC; the wireless receiving device is connected to the PLC and the wireless transmitting device respectively; the wireless receiving device is used to receive the signal of the wireless transmitting device; the PLC is used to generate an alarm signal when the signal received from the wireless transmitting device is interrupted.

[0043] The rectifier substation room components also include: a second power module; the second power module is a 24V power module.

[0044] The components of the rectifier substation room also include: an industrial Ethernet switch; the industrial Ethernet switch is connected to the PLC and the remote control room host computer respectively; the industrial Ethernet switch is used to transmit the alarm signal to the remote control room host computer. The communication method between the PLC and the industrial Ethernet switch is PROFINET.

[0045] In this embodiment, the installation position relationship of each device is as follows: Figure 2:1. The distance between the 10kV distribution room and the rectifier substation room is 500 meters. 2. In the 10kV distribution room: ① Installed in the DC panel of the 10kV distribution room, the 24V power module and the wireless transmitter are installed side by side, the power module is installed on the left, and the wireless transmitter is installed on the right. The 24V power module is responsible for powering the wireless transmitter. ② The DC 220V control relay is installed directly below the wireless transmitter. 3. In the rectifier substation room: ① Installed in the control cabinet of the rectifier substation room, the 24V power module and the wireless receiver are installed side by side, the power module is installed on the left, and the wireless transmitter is installed on the right. The 24V power module is responsible for powering the wireless transmitter. ② The PLC is installed directly below the 24V power module and the wireless receiver. ③ The industrial Ethernet switch is installed directly below the PLC.

[0046] Circuit connection relationship Figure 1 , the functions of the components in the figure are as follows: 1. The voltage between each two phases of L1, L2, and L3 is 380V AC, and the voltage between a single phase (N) is AV220V. 2. The function of the rectifier module is to rectify 380V AC into 220V DC. 3. The function of the voltmeter V1 is to monitor the DC voltage output by the rectifier module. 4. The function of the voltmeter V2 is to monitor the voltage of the DC bus. 5. The function of the ammeter A1 is to monitor the DC current output by the rectifier module. 6. The function of the fuse FU1 is to provide short-circuit protection to prevent the voltmeter V1 from being damaged due to excessive current. 7. The function of the fuses FU2 and FU3 is to provide short-circuit protection to prevent the voltmeter V2 from being damaged due to excessive current. 8. The function of the AC220 / DC24 module is to convert the input 220V AC into 24V DC. 9. The function of the switch quantity wireless transmission module (sending) is to convert the signal into a wireless signal after receiving a switch quantity signal and send it to the receiving device (switch quantity wireless transmission module (receiving)). 10. The function of the control relay KC1 is to close its normally open contact and disconnect its normally closed contact through the electromagnetic force when its coil is energized, thereby controlling the circuit. 11. The function of the switch quantity wireless transmission module (receiving) device is to receive the signal and output a switch quantity after the wireless signal is sent by the matching sending module. 12. The function of the PLC is to collect the signal at the switch quantity wireless transmission module and communicate to the industrial Ethernet switch through PROFINET. 13. The function of the industrial Ethernet switch is a network device used to realize industrial data transmission and exchange. 14. The function of the host computer in the main control room is to serve as a human-machine interface for the operation duty monitoring personnel to inspect and control the entire system. 15. The function of the indicator lights H5 and H6 is live monitoring. When there is electricity at both ends of the indicator lights, the indicator lights will light up to remind that this circuit is energized.

[0047] In the 10kV distribution room:

[0048] 1. The three-phase power supply L1, L2, L3 lead wires are connected to the circuit breaker QF1, the other end of QF1 is connected to the rectifier module Z1, and the indicator light H5 is connected between QF1 and the rectifier module Z1. The output end of the rectifier module Z1 is connected to the DC bus KM+ and M-.

[0049] 2. In the 10kV power distribution room, the three-phase power supply L1, L2, L3 lead wires are connected to the circuit breaker QF2, the other end of QF2 is connected to the rectifier module Z2, and the indicator light H6 is connected between QF2 and the rectifier module Z2. The output end of the rectifier module Z2 is connected to the DC bus KM+ and M-.

[0050] 3. The V1 voltmeter and fuse FU1 are connected in series and then connected in parallel at the output end of the rectifier module.

[0051] 4. The A1 ammeter is connected in series to the positive busbar output by the rectifier module.

[0052] 5. After the V2 voltmeter is connected in series with fuses FU1 and FU2 (V2 is in the middle, FU1 and FU2 are on the left and right), the whole is connected in parallel at both ends of the DC bus.

[0053] 6. The coil of the KC1 control relay is connected in parallel at both ends of the DC bus.

[0054] 7. Connect the L1 and N lead wires to the AC220V input terminal of the AC220 / DC24 module, and the DC24V output terminal to the power terminal of the switch quantity wireless transmission module (transmitter). Connect the I4 and COM terminals of the switch quantity wireless transmission module (transmitter) to the normally open contact of the KC1 control relay.

[0055] In the rectifier substation room:

[0056] 1. The power supply L and N lead wires are connected to the AC220V input terminal of the AC220 / DC24 module, the DC24V output terminal is connected to the power terminal of the switch quantity wireless transmission module (receiving) device, and the output point O4 and COM terminals of the switch quantity wireless transmission module (receiving) device are connected to the PLC input terminal I0.5 terminal.

[0057] 2. The PLC Ethernet communication port is connected to the industrial Ethernet switch using a network cable, and the industrial Ethernet switch is connected to the host computer in the main control room via a network cable.

[0058] Design function principle description:

[0059] In the 10kV distribution room, the three-phase AC power is rectified by the rectifier module and converted into 220V DC power. The control relay KC1 is installed between the DC busbars. When the DC busbars are energized, the KC1 coil is energized, and its normally open contact KC1 is closed. The switch quantity wireless transmission module (transmitter) receives the switch quantity signal from the normally open contact of KC1 after it is closed. The switch quantity wireless transmission module will send a wireless signal to the switch quantity wireless transmission module (receiver) in the rectifier substation room 500 meters away. After receiving the signal, it opens the channel and sends a switch quantity to the PLC. After receiving it, the PLC responds through the internal program, accesses the integrated automation system through the industrial Ethernet switch, and sends the signal to the host computer in the main control room. The host computer reminds the operation monitoring personnel that the DC system power supply of the 10kV distribution room is normal at this time. On the contrary, if the rectifier module in the 10kV distribution room has a problem and the output is abnormal, causing the DC bus to lose power, the KC1 coil loses power and its normally open contact is released, causing the input of the switch quantity wireless transmission module (transmitter) device to be zero, which interrupts the transmission of the wireless signal. At this time, the switch quantity wireless transmission module (receiver) device in the rectifier substation room 500 meters away cannot receive the wireless signal from the transmitter, so its output is zero, and the PLC input is zero. At this time, the host computer in the main control room alarms and reminds the operation monitoring personnel that the DC bus voltage in the 10kV distribution room is abnormal and should be checked.

[0060] A DC 220V intermediate relay KC1 is installed between the control positive bus and the negative bus of the DC system. The operating voltage of the KC1 coil is DC 220V. When the coil is energized, its KC1 normally open contact is closed. After the normally open contact is closed, it forms a closed loop with the switch quantity wireless transmission module (transmitter) device input nodes I4 and COM. When the switch quantity wireless transmission module (transmitter) device detects the input signal, the switch quantity wireless transmission module will send a wireless signal to the switch quantity wireless transmission module (receiving) device in the rectifier substation room 500 meters away.

[0061] After the switch quantity sending device receives the signal from the control relay, its input point I4 is closed, and the signal is sent to the wireless receiving device via wireless transmission.

[0062] The switch quantity wireless transmission module (receiving) device is installed in the machine room of the rectifier substation, 500 meters away from the 10kV distribution room. After receiving the signal, the channel is opened and connected, and a switch quantity is sent to the PLC.

[0063] After receiving the signal, the PLC responds through the internal program, connects to the integrated automation system through the industrial Ethernet switch, and sends the signal to the host computer in the main control room. The host computer reminds the operation monitoring personnel that the DC power supply of the 10kV power distribution room is normal. Otherwise, it means that the DC power supply system is abnormal.

[0064] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the system and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A 10kV DC power failure monitoring system for electrolytic aluminum industry equipment, characterized in that: The 10kV equipment DC power failure monitoring system in the electrolytic aluminum industry is applied to a 10kV power distribution component; The 10kV power distribution assembly includes a plurality of rectifier modules; the rectifier modules are respectively connected to the three-phase power and the DC bus; the DC bus is connected to a plurality of electrical devices; a fuse is provided between the rectifier module and the three-phase power; the rectifier module is used to convert the three-phase power voltage into 220V and supply power through the DC bus; The 10kV DC power failure monitoring system for electrolytic aluminum industry equipment includes: Distribution room detection components and rectifier substation room components; The power distribution room detection component comprises: A first power module, a wireless transmission device and a relay; The first power module is electrically connected to the three-phase power supply; the first power module and the wireless transmitting device are connected via the normally open contact of the relay; The coil of the relay is connected to the DC bus; The wireless transmission device is connected to the rectifier substation room component; The rectifier substation room component sends out an alarm signal when the signal received by the wireless transmitting device is interrupted; the signal interruption of the wireless transmitting device is caused by the disconnection of the normally open contact of the relay; the disconnection of the normally open contact of the relay is caused by the loss of power to the DC bus connected to the coil of the relay; the loss of power to the DC bus is caused by the abnormality of the rectifier module.

2. A 10kV DC power failure monitoring system for electrolytic aluminum industry equipment according to claim 1, characterized in that: The first power module is a 24V power module.

3. The 10kV DC power failure monitoring system for electrolytic aluminum industry equipment according to claim 1 is characterized in that: The 10kV equipment DC power failure monitoring system for the electrolytic aluminum industry also includes: Remote control room host computer; The remote control room host computer is connected to the rectifier substation room components; the remote control room host computer is used to receive alarm signals.

4. A 10kV DC power failure monitoring system for electrolytic aluminum industry equipment according to claim 3, characterized in that: The rectifier substation room components include: Wireless receiving device and PLC; The wireless receiving device is connected to the PLC and the wireless transmitting device respectively; The wireless receiving device is used to receive signals from the wireless transmitting device; The PLC is used to generate an alarm signal when the signal received from the wireless transmitting device is interrupted.

5. A 10kV equipment DC power failure monitoring system for electrolytic aluminum industry according to claim 4, characterized in that: The rectifier substation room assembly also includes: a second power supply module; The second power supply module is connected to three-phase electricity and the wireless receiving device respectively.

6. A 10kV equipment DC power failure monitoring system for electrolytic aluminum industry according to claim 5, characterized in that: The second power supply module is a 24V power supply module.

7. A 10kV equipment DC power failure monitoring system for electrolytic aluminum industry according to claim 4, characterized in that: The rectifier substation room components also include: an industrial Ethernet switch; The industrial Ethernet switch is connected to the PLC and the remote control room host computer respectively; the industrial Ethernet switch is used to transmit the alarm signal to the remote control room host computer.

8. A 10kV DC power failure monitoring system for electrolytic aluminum industry equipment according to claim 7, characterized in that: The communication mode between the PLC and the industrial Ethernet switch is PROFINET.

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