CN113054616B - Electric power unit of underwater control system with insulation monitoring function - Google Patents
Electric power unit of underwater control system with insulation monitoring function Download PDFInfo
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- CN113054616B CN113054616B CN202110318751.8A CN202110318751A CN113054616B CN 113054616 B CN113054616 B CN 113054616B CN 202110318751 A CN202110318751 A CN 202110318751A CN 113054616 B CN113054616 B CN 113054616B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to an electric power unit of an underwater control system with an insulation monitoring function, which comprises a plurality of independent input and output power supply circuits, wherein each independent input and output power supply circuit consists of an internal power supply module, an input monitoring module and a voltage transformation output module; each internal power supply module is used for transmitting input power supply voltage to an input monitoring module in a corresponding input/output power supply circuit, transmitting the input power supply voltage to a voltage transformation output module in the circuit after the input monitoring module performs monitoring processing, and boosting the input voltage through the voltage transformation output module to be used as output power supply voltage; each transformation output module is respectively connected with a PLC control system and used for receiving information transmitted by all input monitoring modules, transmitting the information to the PLC control system corresponding to the transformation output module, and transmitting the information to the main control station of the existing underwater control system after being processed by the PLC control system, thereby monitoring the state of the power unit.
Description
Technical Field
The invention relates to the field of offshore oil engineering, in particular to a power unit of an underwater control system with an insulation monitoring function.
Background
As the development of marine oil moves to deep sea, the research and development of underwater production systems and related equipment have become a hot spot of the research on marine oil development equipment. The underwater control system power unit is power supply equipment of the underwater control system and has the following functions: the method comprises the following steps of monitoring input and output electric energy parameters of the underwater control system, monitoring insulation resistance of the underwater control system, and performing automatic protection and power carrier communication functions.
The power supply umbilical cable working environment of the underwater control system power unit and the underwater control system is relatively severe. The power unit needs to have the characteristics of high working reliability and easiness in maintenance, and needs to have a function of monitoring the insulation resistance of the umbilical cable. At present, most of underwater control system power units of domestic and foreign companies are based on non-redundant systems, or only part of devices adopt redundant design, so that the reliability is low. And its internal equipment does not adopt the modularized design, when certain equipment breaks down in the power unit, need stop system work and come to change trouble equipment, cause huge economic loss and even cause dangerous accident, therefore its maintainability is relatively poor.
In addition, the existing power unit of the underwater control system does not have a power carrier communication function, so that the communication of the underwater control system depends on independent underwater communication equipment, and the cost is increased.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an electric power unit of an underwater control system with insulation monitoring function, which has redundant and modular power supply lines and also has insulation monitoring and protection functions.
In order to achieve the purpose, the invention adopts the following technical scheme: a power unit of an underwater control system with an insulation monitoring function comprises a redundant internal power supply module, a redundant input monitoring module, a redundant voltage transformation output module and a redundant PLC control system; the setting number of each module is the same, and each internal power supply module, the input monitoring module and the voltage transformation output module form an independent input and output power supply circuit; each internal power supply module is used for transmitting input power supply voltage to the input monitoring module in the corresponding input/output power supply line, transmitting the input power supply voltage to the transformation output module in the line after the input monitoring module performs monitoring processing, and boosting the input voltage by the transformation output module to be used as output power supply voltage; each transformation output module is respectively connected with one PLC control system, and each transformation output module is used for receiving information transmitted by all the input monitoring modules, transmitting the information to the PLC control system corresponding to the transformation output module, and transmitting the information to the main control station of the existing underwater control system after being processed by the PLC control system, thereby monitoring the state of the power unit.
Further, the internal power supply module is used for supplying power to a fan, a lighting lamp and the PLC control system in the underwater control system cabinet.
Further, the input monitoring module comprises a first circuit breaker with voltage protection and electric leakage protection functions, an electric leakage protector, a power supply branch, a first electric energy monitoring instrument, a first circuit monitoring relay and a second circuit monitoring relay; the output end of the internal power supply module is connected with one end of the leakage protector in series through the first circuit breaker, the other end of the leakage protector is provided with three power supply branches in parallel, and a first electric energy monitor meter and a first circuit monitoring relay are arranged on a circuit between the other end of the leakage protector and the three power supply branches in parallel; one of the power supply branches is connected with the voltage transformation output module, and the output ends of the other two power supply branches are used as power supply interfaces.
Further, each of the power supply branches includes a second disconnecting switch, a second fuse, and a second circuit monitoring relay; one end of the second isolating switch is connected with the other end of the leakage protector, the other end of the second isolating switch is connected with the second fuse in series, and the second circuit monitoring relay is arranged on a circuit after the second isolating switch is connected in parallel; the first electric energy monitoring instrument is used for monitoring voltage, current and/or frequency in the input monitoring module, the first circuit monitoring relay and the second circuit monitoring relay are used for monitoring on-off of a circuit output to the voltage transformation output module by the input monitoring module, and transmitting the on-off state to the PLC control system through digital quantity.
Furthermore, a first circuit state indicator lamp is arranged on one side of the first circuit monitoring relay in parallel.
And a second circuit state indicating lamp is arranged on the other end of the second isolating switch and a line in series connection with the second fuse in parallel.
Further, the voltage transformation output module comprises a third isolating switch, a third fuse, a voltage regulating transformer, a power carrier module, a circuit breaker with a shunt release, a third electric energy monitoring instrument, a transformer, an insulation protection circuit, a third circuit monitoring relay and a third circuit state indicating lamp; the output end of the input monitoring module is connected with one end of a third isolating switch, the other end of the third isolating switch is connected with one end of the regulating transformer in series through a third fuse, a third circuit monitoring relay is arranged on a line between the third fuse and one end of the regulating transformer in parallel, and a third circuit state indicating lamp is arranged on one side of the third circuit monitoring relay in parallel; the other end of the regulating transformer is sequentially connected in series with the power carrier module and one end of the breaker with the shunt release, and the third electric energy monitoring instrument is arranged at the two ends of the regulating transformer in parallel; the other end of the circuit breaker with the shunt release is used as an output line, the transformer is arranged on the output line in parallel, and the output line is subjected to boosting treatment by the transformer and then is transmitted to the PLC control system by the third circuit monitoring relay.
Furthermore, an insulation protection circuit is arranged in parallel on a line of the power carrier module and one end of the circuit breaker with the shunt release, which are connected in series.
Further, the insulation protection circuit comprises an insulation monitor, a circuit breaker with a shunt release, an unloading circuit relay, an unloading resistor, a second contactor, an alarm indicator lamp and an insulation protection function button; the insulation monitor is used for monitoring the insulation resistance of the umbilical cable and sending the insulation resistance to the PLC control system through an analog quantity signal; one end of the insulation monitor is connected in parallel with a circuit formed by connecting the power carrier module and one end of the circuit breaker with the shunt release in series, and the insulation monitor is provided with the insulation protection function button and the unloading circuit relay which are connected in series in parallel; one end of the unloading circuit relay is connected with the circuit breaker with the shunt release, and the insulation protection function button is also connected with the alarm indicator lamp; one end of the unloading resistor is grounded, the other end of the unloading resistor is connected with the second contactor in series to form an unloading branch circuit, and the unloading branch circuit is connected to the output circuit in parallel; one end of the other unloading circuit relay is connected with the circuit breaker with the shunt release through the second contactor, and the other end of the other unloading circuit relay is connected with the PLC control system.
Further, the PLC control system comprises a redundant PLC power supply module, a redundant CPU module, a redundant modbusRTU communication module, a redundant analog quantity input module and a redundant digital quantity input module; the power supply module is used for providing redundant power supply for the PLC control system, the ModbusRTU module is used for collecting data of an electric energy monitoring instrument and transmitting the data to the CPU module, the analog quantity input module is used for collecting data of an insulation monitor and transmitting the data to the CPU module, and the digital quantity input module is used for collecting signals of a circuit monitoring relay and transmitting the signals to the CPU module; the CPU module is used for receiving data, acquiring data of a digital quantity input module, an analog quantity input module and a modbusRTU communication module in the PLC control system, and sending the data to the underwater control system main control station through an Ethernet communication interface.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. the invention has the advantages of high reliability and easy maintenance. Based on a redundant and modularized power supply line, an internal power supply module, a redundant input monitoring module and a redundant voltage transformation output module are all configured in a redundant and modularized way, and when a single device fails, the integrity of the other power supply function is not influenced; and each module is easy to install and dismantle and can be replaced quickly.
2. The invention has the functions of monitoring and protecting the insulation of the umbilical cable. The insulation monitor is responsible for monitoring the insulation resistance of the umbilical cable, and can automatically alarm and turn off the output of the power unit when the resistance value is smaller than a set value.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of an independent input/output power supply circuit structure according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used only for convenience in describing the present invention and for simplification of description, and do not represent the importance of the respective parts, and thus, should not be construed as limiting the present invention.
The invention provides a power unit of an underwater control system with an insulation monitoring function, wherein the power unit adopts a modular structure, and each module can be independently replaced and maintained. As shown in fig. 1, the present invention includes a redundant internal power supply module 1, a redundant input monitoring module 2, a redundant voltage transformation output module 3, and a redundant PLC control system 4; the number of the modules is the same, and each internal power supply module 1, the input monitoring module 2 and the voltage transformation output module 3 form an independent input/output power supply circuit. Each internal power supply module 1 is used for transmitting input power supply voltage to an input monitoring module 2 in a corresponding input/output power supply circuit, transmitting the input power supply voltage to a transformation output module 3 in the circuit after the input monitoring module 2 performs monitoring processing, and boosting the input voltage through the transformation output module 3 to be used as output power supply voltage. Meanwhile, each voltage transformation output module 3 is respectively connected with one PLC control system 4, and each voltage transformation output module 3 is used for receiving information transmitted by all the input monitoring modules 2, transmitting the information to the PLC control system 4 corresponding to the voltage transformation output module 3, and transmitting the information to the existing underwater control system main control station after being processed by the PLC control system 4, thereby monitoring the state of the power unit.
In the above embodiment, two independent input/output power supply lines are preferably provided. The input power supply is 220V/50Hz alternating current, and the input power supply is boosted to 522V/50Hz output power supply after passing through the internal power supply module 1, the input monitoring module 2 and the voltage transformation output module 3.
In a preferred embodiment, as shown in fig. 2, in each independent input/output power supply line, the internal power supply module 1 is used for supplying power to the fan 5, the lighting lamp 6 and the PLC control system 4 in the underwater control system cabinet.
A first isolating switch 7, a first fuse 8 and a first contactor 9 are arranged in the internal power supply module 1. One end and the input power supply of first isolator 7 are connected, and first isolator 7's the other end is connected with fan 5, light 6 and the PLC control system 4 of treating the power supply through a first fuse 8 respectively, and inside power module 1 is fan 5 and the light 6 power supply in for the rack through first contactor 9.
In a preferred embodiment, as shown in fig. 2, the input monitoring module 2 includes a first circuit breaker 10 with voltage protection and leakage protection functions, a leakage protector 11, a power supply branch, a first power monitoring instrument 12, a first circuit monitoring relay 13, a second isolating switch 15, a second fuse 16, a second circuit monitoring relay 17, a first circuit status indicator lamp 14 and a second circuit status indicator lamp 18. The output end of the internal power supply module 1 is connected with one end of a leakage protector 11 in series through a first circuit breaker 10, and the overvoltage, undervoltage and overcurrent protection functions of input voltage are realized through the first circuit breaker 10; the other end of the earth leakage protector 11 is provided with three power supply branches in parallel, a first electric energy monitoring instrument 12 and a first circuit monitoring relay 13 are arranged on a circuit between the other end of the earth leakage protector 11 and the three power supply branches in parallel, and a first circuit state indicator lamp 14 is further arranged on one side of the first circuit monitoring relay 13 in parallel. One of the power supply branches is connected with the voltage transformation output module 3, and the output ends of the other two power supply branches are used as power supply interfaces; each power supply branch comprises a second isolating switch 15, a second fuse 16, a second circuit monitoring relay 17 and a second circuit state indicator lamp 18; one end of the second isolating switch 15 is connected with the other end of the earth leakage protector 11, the other end of the second isolating switch 15 is connected with the second fuse 16 in series, and a second circuit monitoring relay 17 and a second circuit state indicator lamp 18 are arranged on a circuit after the series connection in parallel. The first electric energy monitoring instrument 12 is used for monitoring the voltage, the current and/or the frequency inside the input monitoring module 2, and the first and second circuit monitoring relays 17 and the first and second circuit status indicator lamps 18 are used for monitoring the on-off of the circuit output to the transformation output module 3 by the input monitoring module 2 and transmitting the on-off state to the PLC control system 4 through digital quantity.
In a preferred embodiment, as shown in fig. 2, the transformer output module 3 includes a third isolation switch 19, a third fuse 20, a regulating transformer 21, a power carrier module 24, a circuit breaker with shunt release 25, a third power monitoring instrument 26, a transformer 27, an insulation protection circuit, a third circuit monitoring relay 22, and a third circuit status indicator lamp 23. The output end of the input monitoring module 2 is connected with one end of a third isolating switch 19, the other end of the third isolating switch 19 is connected with one end of a regulating transformer 21 in series through a third fuse 20, a third circuit monitoring relay 22 is arranged on a line between the third fuse 20 and one end of the regulating transformer 21 in parallel, and a third circuit state indicating lamp 23 is arranged on one side of the third circuit monitoring relay 22 in parallel; the other end of the voltage regulating transformer 21 is sequentially connected in series with one end of a power carrier module 24 and one end of a breaker 25 with a shunt release, and the power carrier module 24 is responsible for establishing power carrier communication with an underwater control module of the underwater control system; the third electric energy monitoring instrument 26 is arranged at two ends of the regulating transformer 21 in parallel, the input voltage boosts the 220V voltage to 522V voltage through the regulating transformer 21, and the state of the transformer output circuit is monitored by the third electric energy monitoring instrument 26, the third circuit monitoring relay 22 and the third circuit state indicator lamp 23; the other end of the circuit breaker 25 with shunt release serves as the output line. A transformer 27 is arranged in parallel on the output line, and the output line is subjected to boosting treatment by the transformer 27 and then transmitted to the PLC control system 4 by the third circuit monitoring relay 22.
In the above embodiment, an insulation protection circuit is provided in parallel on a line in which the power carrier module 24 and one end of the circuit breaker 25 with shunt release are connected in series. The insulation protection circuit comprises an insulation monitor 28, a circuit breaker 25 with a shunt release, an unloading circuit relay 29, an unloading resistor 30, a second contactor 31, an alarm indicator lamp 32 and an insulation protection function button 33. The insulation monitor 28 is used for monitoring the insulation resistance of the umbilical cable and sending the insulation resistance to the PLC control system 4 through a 4-20mA analog quantity signal; one end of the insulation monitor 28 is connected in parallel with a circuit formed by connecting the power carrier module 24 and one end of the circuit breaker 25 with the shunt release in series, and an insulation protection function button 33 and an unloading circuit relay 29 which are connected in series are connected in parallel with the insulation monitor 28; one end of the unloading circuit relay 29 is connected with the circuit breaker 25 with shunt release, and the insulation protection function button 33 is also connected with the alarm indicator lamp 32. One end of the unloading resistor 30 is grounded, the other end of the unloading resistor is connected with the second contactor 31 in series to form an unloading branch circuit, and the unloading branch circuit is connected to the output line in parallel and used for discharging the residual electric quantity of the umbilical cable when the line is turned off; one end of the other unloading circuit relay 29 is connected with the circuit breaker 25 with the shunt release through a second contactor 31, and the other end of the other unloading circuit relay 29 is connected with the PLC control system 4.
When the insulation protection circuit is used, the insulation protection circuit has a 2-level insulation protection function, and when the line insulation resistance is smaller than the set alarm value 1 of the insulation monitor 28, the circuit breaker 25 with the shunt release and the unloading circuit relay 29 do not act. When the insulation resistance is less than the alarm value 2, the circuit breaker 25 with shunt release is opened, the unloading circuit relay 29 is closed, and the umbilical is discharged through the unloading resistor 30. When the insulation protection function button 33 is pressed, the circuit breaker 25 with shunt release and the unload circuit relay 29 are not actuated.
In a preferred embodiment, the PLC control system 4 includes redundant PLC power supply modules, redundant CPU modules, redundant modbusRTU communication modules, redundant analog input modules, and redundant digital input modules. The power supply module is used for providing redundant power supply for the PLC control system 4, the ModbusRTU module is used for collecting data of the electric energy monitoring instrument and transmitting the data to the CPU module, the analog quantity input module is used for collecting data of the insulation monitor 28 and transmitting the data to the CPU module, and the digital quantity input module is used for collecting signals of the circuit monitoring relay and transmitting the signals to the CPU module; the CPU module is used for receiving data, acquiring data of a digital quantity input module, an analog quantity input module and a modbusRTU communication module in the PLC control system, and sending the data to a master control station of the underwater control system through an Ethernet communication interface, so that the state of the power unit is monitored.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical scheme of the present invention, the improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (6)
1. A power unit of an underwater control system with an insulation monitoring function is characterized by comprising a redundant internal power supply module, a redundant input monitoring module, a redundant variable voltage output module and a redundant PLC control system; the setting number of each module is the same, and each internal power supply module, the input monitoring module and the voltage transformation output module form an independent input and output power supply circuit;
each internal power supply module is used for transmitting input power supply voltage to the input monitoring module in the corresponding input/output power supply line, transmitting the input power supply voltage to the transformation output module in the line after the input monitoring module performs monitoring processing, and boosting the input power supply voltage by the transformation output module to be used as output power supply voltage;
each transformation output module is respectively connected with one PLC control system, and is used for receiving information transmitted by all the input monitoring modules, transmitting the information to the PLC control system corresponding to the transformation output module, and transmitting the information to a master control station of the existing underwater control system after being processed by the PLC control system, so as to monitor the state of a power unit;
the input monitoring module comprises a first circuit breaker with voltage protection and electric leakage protection functions, an electric leakage protector, a power supply branch, a first electric energy monitoring instrument, a first circuit monitoring relay and a second circuit monitoring relay; the output end of the internal power supply module is connected with one end of the leakage protector in series through the first circuit breaker, the other end of the leakage protector is provided with three power supply branches in parallel, and a first electric energy monitor meter and a first circuit monitoring relay are arranged on a circuit between the other end of the leakage protector and the three power supply branches in parallel; one of the power supply branches is connected with the voltage transformation output module, and the output ends of the other two power supply branches are used as power supply interfaces;
the voltage transformation output module comprises a third isolating switch, a third fuse, a voltage regulating transformer, a power carrier module, a circuit breaker with a shunt release, a third electric energy monitoring instrument, a transformer, an insulation protection circuit, a third circuit monitoring relay and a third circuit state indicator lamp; the output end of the input monitoring module is connected with one end of a third isolating switch, the other end of the third isolating switch is connected with one end of the regulating transformer in series through a third fuse, a third circuit monitoring relay is arranged on a line between the third fuse and one end of the regulating transformer in parallel, and a third circuit state indicating lamp is arranged on one side of the third circuit monitoring relay in parallel; the other end of the regulating transformer is sequentially connected in series with the power carrier module and one end of the breaker with the shunt release, and the third electric energy monitoring instrument is arranged at the two ends of the regulating transformer in parallel; the other end of the circuit breaker with the shunt release is used as an output line, the transformer is arranged on the output line in parallel, and the output line is subjected to boosting treatment by the transformer and then is transmitted to the PLC control system by the third circuit monitoring relay;
an insulation protection circuit is arranged in parallel on a circuit formed by connecting the power carrier module and one end of the circuit breaker with the shunt release in series;
the insulation protection circuit comprises an insulation monitor, a circuit breaker with a shunt release, an unloading circuit relay, an unloading resistor, a second contactor, an alarm indicator lamp and an insulation protection function button; the insulation monitor is used for monitoring the insulation resistance of the umbilical cable and sending the insulation resistance to the PLC control system through an analog quantity signal; one end of the insulation monitor is connected in parallel with a circuit formed by connecting the power carrier module and one end of the circuit breaker with the shunt release in series, and the insulation monitor is provided with the insulation protection function button and the unloading circuit relay which are connected in series in parallel; one end of the unloading circuit relay is connected with the circuit breaker with the shunt release, and the insulation protection function button is also connected with the alarm indicator lamp; one end of the unloading resistor is grounded, the other end of the unloading resistor is connected with the second contactor in series to form an unloading branch circuit, and the unloading branch circuit is connected to the output circuit in parallel; one end of the other unloading circuit relay is connected with the circuit breaker with the shunt release through the second contactor, and the other end of the other unloading circuit relay is connected with the PLC control system.
2. The power unit of claim 1, wherein the internal power module is configured to power fans, lights, and the PLC control system within the subsea control system cabinet.
3. The power unit of claim 1, wherein each of the power supply branches includes a second isolation switch, a second fuse, and a second circuit monitoring relay; one end of the second isolating switch is connected with the other end of the leakage protector, the other end of the second isolating switch is connected with the second fuse in series, and the second circuit monitoring relay is arranged on a circuit after the second isolating switch is connected in parallel; the first electric energy monitoring instrument is used for monitoring voltage, current and/or frequency in the input monitoring module, the first circuit monitoring relay and the second circuit monitoring relay are used for monitoring on-off of a circuit output to the voltage transformation output module by the input monitoring module, and transmitting the on-off state to the PLC control system through digital quantity.
4. The power unit as claimed in claim 1, wherein a first circuit status indicator lamp is provided in parallel on one side of the first circuit monitoring relay.
5. The power unit as claimed in claim 3, wherein a second circuit status indicator lamp is provided in parallel on a line connecting the other end of the second disconnector and the second fuse in series.
6. The power unit of any of claims 1 to 5, wherein the PLC control system comprises redundant PLC power supply modules, redundant CPU modules, redundant modbusRTU communication modules, redundant analog input modules, and redundant digital input modules; the system comprises a PLC power supply module, a modbusRTU communication module, an analog quantity input module, a digital quantity input module and a CPU module, wherein the PLC power supply module is used for providing redundant power supply for the PLC control system, the modbusRTU communication module is used for collecting data of an electric energy monitoring instrument and transmitting the data to the CPU module, the analog quantity input module is used for collecting data of an insulation monitor and transmitting the data to the CPU module, and the digital quantity input module is used for collecting signals of a circuit monitoring relay and transmitting the signals to the CPU module; the CPU module is used for receiving data, acquiring data of a digital quantity input module, an analog quantity input module and a modbusRTU communication module in the PLC control system, and sending the data to the underwater control system main control station through an Ethernet communication interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110318751.8A CN113054616B (en) | 2021-03-25 | 2021-03-25 | Electric power unit of underwater control system with insulation monitoring function |
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| CN202110318751.8A CN113054616B (en) | 2021-03-25 | 2021-03-25 | Electric power unit of underwater control system with insulation monitoring function |
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| CN113054616B true CN113054616B (en) | 2023-01-03 |
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| US20150200567A1 (en) * | 2014-01-10 | 2015-07-16 | Zippy Technology Corp. | Redundant power supply system for reducing standby power consumption |
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