CN111934276A - Power supply system for partial discharge detection device and power supply method thereof - Google Patents
Power supply system for partial discharge detection device and power supply method thereof Download PDFInfo
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- CN111934276A CN111934276A CN202010799271.3A CN202010799271A CN111934276A CN 111934276 A CN111934276 A CN 111934276A CN 202010799271 A CN202010799271 A CN 202010799271A CN 111934276 A CN111934276 A CN 111934276A
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
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- 239000004065 semiconductor Substances 0.000 description 6
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- 239000003990 capacitor Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
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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
- H02H3/08—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 excess current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
- B60L53/16—Connectors, e.g. plugs or sockets, specially adapted for charging electric vehicles
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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
- H02H3/24—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 undervoltage or no-voltage
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of electric power, in particular to a power supply system for a partial discharge detection device and a power supply method thereof, wherein the power supply system comprises an electric engineering vehicle, a charging gun assembly and a power supply conversion device, the power supply conversion device comprises a power supply input protection device, an inversion device and a power supply output protection device which are sequentially and electrically connected, and the power supply output protection device is used for being electrically connected with the partial discharge detection device; the input end of the charging gun assembly is connected with the electric engineering vehicle, and the output end of the charging gun assembly is connected with the power input protection device. The invention has convenient operation, can simultaneously protect the charging equipment and the equipment to be charged, avoids damaging the charging equipment or the equipment to be charged and improves the use safety.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a power supply system for a partial discharge detection device and a power supply method thereof.
Background
Along with the continuous acceleration of the urbanization process and the continuous improvement of the living standard of residents, the common application of household high-power electric equipment of the residents is accompanied by the increase of the power consumption, the increase of the power consumption of urban areas, the cable projects needing to be newly built or modified and expanded are gradually increased, the cables of the urban areas are more and more densely laid, and the mileage is more and more long. In order to ensure the reliability and stability of the electricity consumption of residents and prevent power failure accidents of power supply, the working frequency and the workload of outdoor cable detection are gradually increased, such as HFCT partial discharge online monitoring, oscillatory wave partial discharge detection, ultralow frequency dielectric loss detection and the like. The alternating current that traditional outdoor cable check out test set or instrument need be used is comparatively troublesome because of implementing on-the-spot access municipal power, consequently need use the small-size diesel generating set of machineshop car consignment to supply power for outdoor check out test set or instrument.
With the popularization of new energy electric power engineering vehicles, the application of the new energy electric power engineering vehicles is gradually increased, but the new energy electric power engineering vehicles provide direct current through storage batteries, and outdoor cable detection equipment or instruments mostly need alternating current power supplies, so the new energy electric power engineering vehicles cannot directly supply power for the outdoor cable detection equipment or instruments.
Chinese patent publication No. CN109245284A discloses a dual-source power supply system and a dual-source power engineering vehicle, which do not discharge pollutant gas, thereby meeting the low-emission environmental protection requirement of urban railways; moreover, the double-source system power supply system of the electric power engineering truck is applicable to two power supply modes of a contact net and a traction storage battery, and can realize automatic switching of the two power supply modes.
However, the above scheme does not protect the device to be charged, so that the safety is not high enough.
Disclosure of Invention
The invention aims to overcome the defect that the device to be charged is not protected, and provides a power supply system for a partial discharge detection device and a power supply method thereof, which are convenient to operate, can simultaneously protect the charging device and the device to be charged, avoid damage to the charging device or the device to be charged and improve the use safety.
In order to solve the technical problems, the invention adopts the technical scheme that:
the power supply system comprises an electric engineering vehicle, a charging gun assembly and a power supply conversion device, wherein the power supply conversion device comprises a power supply input protection device, an inversion device and a power supply output protection device which are sequentially and electrically connected, and the power supply output protection device is used for being electrically connected with the partial discharge detection device; the input end of the charging gun assembly is connected with the electric engineering vehicle, and the output end of the charging gun assembly is connected with the power input protection device.
The invention comprises a power supply system for a partial discharge detection device, wherein an electric engineering vehicle is used for outputting direct current of a battery, and the direct current at the output end of the electric engineering vehicle can be converted into alternating current by arranging an inverter, so that the requirement of the alternating current required by the partial discharge detection device is met. The setting of power input protection device can be used for protecting the safety of electric power engineering car, and the setting of power output protection device can be used for protecting the safety of partial discharge detection device, prevents that electric power engineering car or partial discharge detection device from being damaged. Simultaneously, supply power through the electric power engineering car, can avoid the emission of noise or pollutant, and use the rifle subassembly that charges to connect, the simple operation, labour saving and time saving.
Preferably, the power output protection device comprises a second overload protection device, a second undervoltage protection device electrically connected with the second overload protection device, and a second short-circuit protection device, and the second undervoltage protection device is electrically connected with the second short-circuit protection device; the second overload protection device is electrically connected with the inverter device. The arrangement of the second undervoltage protection device, the second short-circuit protection device and the second overload protection device ensures that the partial discharge detection device can pass through the power output protection device when receiving electric energy, and can immediately cut off an output loop when encountering the problems of undervoltage, short circuit and overload, thereby protecting the safety of the partial discharge detection device.
Preferably, the second overload protection apparatus includes a second overload relay and a second contactor electrically connected to the second overload relay; the second contactor is electrically connected with the inverter device, the second undervoltage protection device and the second short-circuit protection device, and the second overload relay is electrically connected with the second undervoltage protection device and the second short-circuit protection device.
Preferably, the second undervoltage protection device is an undervoltage relay, and the second short-circuit protection device is a short-circuit monitoring relay.
Preferably, the power input protection device comprises a first overload protection device, a first undervoltage protection device electrically connected with the first overload protection device, and a first short-circuit protection device, and the first undervoltage protection device is electrically connected with the first short-circuit protection device; the first overload protection device is electrically connected with the inverter and the charging gun assembly. The arrangement of the first undervoltage protection device, the first short-circuit protection device and the first overload protection device enables the electric energy output of the battery of the electric engineering vehicle to pass through the power input protection device, and when the problems of undervoltage, short circuit and overload occur, the input loop can be cut off immediately to protect the safety of the electric engineering vehicle.
Preferably, the first overload protection apparatus includes a first overload relay and a first contactor electrically connected to the first overload relay; the first contactor is electrically connected with the inverter device, the first under-voltage protection device and the first short-circuit protection device; the first overload relay is electrically connected with the charging gun assembly, the first undervoltage protection device and the first short-circuit protection device.
Preferably, the charging gun assembly comprises a first charging gun for plugging an electric engineering vehicle and a second charging gun for plugging a power input protection device, and the first charging gun is electrically connected with the second charging gun. The first rifle that charges, the setting of second rifle that charges for the very convenient easy operation of the operation of charging of electric power engineering car can improve work efficiency.
Preferably, the power input protection device is electrically connected with the second charging gun through a second charging gun socket.
Preferably, the electric power engineering truck is provided with a first charging gun socket for being connected with a first charging gun.
The invention also comprises a power supply method of the power supply system for the partial discharge detection device, which comprises the following steps:
s1, connecting the first charging gun with an electric engineering vehicle, and connecting the second charging gun with a power supply input protection device;
s2, connecting the power output protection device with a partial discharge detection device;
s3, starting a power supply of the electric engineering vehicle;
s4, when the input loop between the electric engineering vehicle and the power supply input protection device has the problems of undervoltage, short circuit or overload in the charging process, the first undervoltage protection device, the first short circuit protection device and the first overload protection device are correspondingly disconnected, so that the charging is stopped;
s5, when the output loop between the power output protection device and the partial discharge detection device has the problems of undervoltage, short circuit or overload in the charging process, the second undervoltage protection device, the second short circuit protection device and the second overload protection device are correspondingly disconnected, so that the charging is stopped;
the step S1 and the step S2 are not in sequence, and the step S4 and the step S5 are not in sequence.
Compared with the prior art, the invention has the beneficial effects that:
the electric power engineering vehicle is used for outputting direct current of the battery, and the direct current at the output end of the electric power engineering vehicle can be converted into alternating current by arranging the inverter, so that the requirement of the alternating current required by the partial discharge detection device is met. The setting of power input protection device can be used for protecting the safety of electric power engineering car, and the setting of power output protection device can be used for protecting the safety of partial discharge detection device, prevents that electric power engineering car or partial discharge detection device from being damaged. Simultaneously, supply power through the electric power engineering car, can avoid the emission of noise or pollutant, and use the rifle subassembly that charges to connect, the simple operation, labour saving and time saving.
Drawings
Fig. 1 is a schematic structural diagram of a power supply system for a partial discharge detection apparatus according to the present invention.
Fig. 2 is a schematic structural diagram of the charging gun assembly and the power input protection device according to the present invention.
Fig. 3 is a schematic structural diagram of the power output protection device of the present invention.
Fig. 4 is a schematic structural diagram of the charging gun assembly and other devices according to the present invention.
Fig. 5 is a schematic diagram of an inverter according to the present invention.
Fig. 6 is a flowchart of a power supply method of a power supply system for an partial discharge detection apparatus according to the present invention.
The graphic symbols are illustrated as follows:
1-electric engineering vehicle, 11-first charging gun socket, 2-charging gun assembly, 21-first charging gun, 22-second charging gun, 3-power input protection device, 31-first under-voltage protection device, 32-first short-circuit protection device, 33-first overload protection device, 331-first overload relay, 332-first contactor, 34-second charging gun socket, 4-inverter device, 41-voltage sensor, 42-current sensor, 43-inverter controller, 44-temperature sensor, 5-power output protection device, 51-second under-voltage protection device, 52-second short-circuit protection device, 53-second overload protection device, 531-second overload relay, 532-second contactor, 6-partial discharge detection device.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example 1
Fig. 1 to 5 show an embodiment of a power supply system for a partial discharge detection device according to the present invention, which includes an electric engineering vehicle 1, and further includes a charging gun assembly 2 and a power conversion device, where the power conversion device includes a power input protection device 3, an inverter device 4, and a power output protection device 5, which are sequentially electrically connected, and the power output protection device 5 is used to be electrically connected to a partial discharge detection device 6; the input end of the charging gun assembly 2 is connected with the electric engineering vehicle 1, and the output end of the charging gun assembly 2 is connected with the power input protection device 3.
The electric power engineering vehicle 1 is used for outputting direct current of a battery, and the direct current at the output end of the electric power engineering vehicle 1 can be converted into alternating current by arranging the inverter device 4, so that the requirement of the alternating current required by the partial discharge detection device 6 is met. The arrangement of the power input protection device 3 can be used for protecting the safety of the electric power engineering vehicle 1, and the arrangement of the power output protection device 5 can be used for protecting the safety of the partial discharge detection device 6, so that the electric power engineering vehicle 1 or the partial discharge detection device 6 is prevented from being damaged. Simultaneously, supply power through electric power engineering car 1, can avoid the emission of noise or pollutant, and use the rifle subassembly 2 that charges to connect, the simple operation, labour saving and time saving.
In addition, the power input protection device 3 comprises a first overload protection device 33, a first undervoltage protection device 31 and a first short-circuit protection device 32 which are electrically connected with the first overload protection device 33, wherein the first undervoltage protection device 31 is electrically connected with the first short-circuit protection device 32; the first overload protection device 33 is electrically connected with the inverter device 4 and the charging gun assembly 2. The arrangement of the first undervoltage protection device 31, the first short-circuit protection device 32 and the first overload protection device 33 enables the electric energy output of the battery of the electric engineering vehicle 1 to pass through the power input protection device 3, and when the problems of undervoltage, short circuit and overload occur, the input loop can be cut off immediately, so that the safety of the electric engineering vehicle 1 is protected.
Wherein, the first overload protection apparatus 33 includes a first overload relay 331 and a first contactor 332 electrically connected to the first overload relay 331; the first contactor 332 is electrically connected with the inverter device 4, the first undervoltage protection device 31 and the first short-circuit protection device 32; the first overload relay 331 is electrically connected to the charging gun assembly 2, the first undervoltage protection device 31, and the first short-circuit protection device 32. Specifically, the first undervoltage protection device 31 is an undervoltage relay, and the first short-circuit protection device 32 is a short-circuit monitoring relay.
In addition, the power output protection device 5 comprises a second overload protection device 53, a second undervoltage protection device 51 and a second short-circuit protection device 52 which are electrically connected with the second overload protection device 53, wherein the second undervoltage protection device 51 is electrically connected with the second short-circuit protection device 52; the second overload protection device 53 is electrically connected to the inverter device 4. The second undervoltage protection device 51, the second short-circuit protection device 52 and the second overload protection device 53 are arranged, so that the partial discharge detection device 6 can pass through the power output protection device 5 firstly when receiving electric energy, and when encountering the problems of undervoltage, short circuit and overload, an output loop can be cut off immediately to protect the safety of the partial discharge detection device 6.
Wherein the second overload protection apparatus 53 includes a second overload relay 531 and a second contactor 532 electrically connected to the second overload relay 531; the second contactor 532 is electrically connected to the inverter 4, the second undervoltage protection device 51, and the second short-circuit protection device 52, and the second overload relay 531 is electrically connected to the second undervoltage protection device 51 and the second short-circuit protection device 52. Specifically, the second undervoltage protection device 51 is an undervoltage relay, and the second short-circuit protection device 52 is a short-circuit monitoring relay. It should be noted that the partial discharge detection device 6 may be any one of an ultrasonic partial discharge detection device, an ultrahigh frequency partial discharge detection device, a metal foil electrode partial discharge detection device, and an HFCT partial discharge detection device, and power supply cables between these devices and the second overload relay 531 depend on an equipment interface.
As shown in fig. 5, the inverter device 4 includes a power inverter circuit and an inverter protection circuit, the power inverter circuit includes a voltage input interface Vd, an output filter inductor L, an output filter capacitor C, and also includes a plurality of semiconductor switching devices G1, G2, G3, G4, and the semiconductor switching devices G1, G2, G3, G4 are all electrically connected to the first contactor 332; one end of the output filter inductor L is electrically connected with the semiconductor switching device G1, and the other end of the output filter inductor L is electrically connected with one end of the output filter capacitor C; the other end of the output filter capacitor C is electrically connected to the semiconductor switching device G4. In order to ensure the stability of the quality of the output power supply of the electric power engineering vehicle 1 under outdoor conditions and meet the power supply quality requirements under the conditions of different load types and multi-load simultaneous working, the inversion protection circuit is controlled in a double-loop control mode.
The outer loop is an inverter controller 43, and can adopt a V/f control mode, a droop control mode or a VSG control mode. Under the condition that the electric equipment has high stability requirements on the amplitude and the frequency of the output voltage of the inverter device, the inverter controller uses V/f control and is generally used for a non-difference controllable power supply; droop control, which is to simulate a droop characteristic curve according to the battery characteristics of the engineering vehicle and generally used for feeding back electric energy to a power grid; VSG control allows the inverter to simulate the operating characteristic curve of the synchronous generator through a mathematical model, and is generally used for maintaining the grid-connected stability of the inverter. In this embodiment, V/f control is adopted. The inner ring is as shown in the figure5, shown by dotted lines, mainly performs inverter output regulation to improve the quality of voltage and current output by the power inverter circuit, wherein U isd0、Uq0Indicating the reference semaphore, U, of the outer loop voltage control input inner loopd、Uq、Id、IqAnd d-axis component and q-axis component representing alternating voltage and current, the PI linear controller linearly combines proportional integral of the deviation to form control quantity, and controls the controlled object to obtain voltage parameter Vdref、Vqref. Passing voltage parameter Vdref、VqrefAnd the inverter controller 43 can perform switching control of G1, G2, G3, and G4 by voltage signals. A plurality of voltage sensors 41 and current sensors 42 are further electrically connected between the power supply inverter circuit and the inverter protection circuit, specifically, one voltage sensor 41 and one current sensor 42 are electrically connected between both ends of the output filter capacitor C and the second contactor 532, and the voltage sensor 41 and the current sensor 42 are further electrically connected with the inner ring. Also, temperature sensors 44 are mounted at the surfaces of the semiconductor switching devices G1, G2, G3 and G4, each temperature sensor 44 is electrically connected to the inverter controller 43, that is, each temperature sensor 44 communicates with the inverter controller 43 through SPI; the temperature sensor 44 is used for monitoring whether the working temperature of the semiconductor switching device exceeds a limit value or not, and transmitting a signal to the inverter controller 43, so that the inverter device 4 can be stopped in time when a problem occurs. It should be noted that the inverter 4 may also be an inverter with model number CJ-5000W.
Furthermore, the charging gun assembly 2 comprises a first charging gun 21 for plugging the electric engineering vehicle 1 and a second charging gun 22 for plugging the power input protection device 3, and the first charging gun 21 is electrically connected with the second charging gun 22.
The power input protection device 3 is electrically connected to the second charging gun 22 through the second charging gun socket 34. The electric power engineering vehicle 1 is provided with a first charging gun socket 11 for connecting with a first charging gun 21.
As shown in fig. 2 and 4, the first charging gun 21 and the second charging gun 22 both use national standard charging guns, and the second charging gun socket 34 is a national standard charging gun socket. Through setting up the rifle that charges, can realize being connected of electric power engineering car 1 and power conversion equipment high-efficiently safely.
Example 2
Fig. 6 shows an embodiment of a power supply method for a power supply system of an partial discharge detection apparatus according to the present invention, which includes the following steps:
s1, a first charging gun 21 is connected with a first charging gun socket 11 on the electric engineering vehicle 1, and a second charging gun 22 is connected with a second charging gun socket 34 of the power input protection device 3.
S2, connecting the second overload relay 531 with the partial discharge detection device 6;
and S3, starting a power supply of the electric engineering vehicle 1.
And S4, when the input loop between the electric engineering vehicle 1 and the power input protection device 3 has the problems of undervoltage, short circuit or overload in the charging process, the first undervoltage protection device 31, the first short circuit protection device 32 and the first overload protection device 33 are correspondingly disconnected, so that the charging is stopped.
Specifically, when the voltage of the input circuit is lower than the set value, the normally closed contact of the first undervoltage protection device 31, i.e. the undervoltage relay, is opened to disconnect the input circuit, so that the charging is stopped;
when the input circuit is short-circuited, the first short-circuit protection device 32, i.e. the short-circuit monitoring relay, has its normally closed contacts open, so that the input circuit is powered off, and the charging is stopped;
when the input circuit has an overload problem, the first overload relay 331 of the first overload protection device 33 triggers the first contactor 332 to cut off the input circuit, so that the charging is stopped.
The input circuit refers to the lines of the electric engineering vehicle 1, the charging gun assembly 2, the first undervoltage protection device 31 and the first short-circuit protection device 32.
And S5, when the output loop between the power output protection device 5 and the partial discharge detection device 6 has the problems of undervoltage, short circuit or overload in the charging process, the second undervoltage protection device 51, the second short-circuit protection device 52 and the second overload protection device 53 are correspondingly disconnected, so that the charging is stopped.
Specifically, when the voltage of the output circuit is lower than the set value, the second undervoltage protection device 51, i.e., the undervoltage relay, has its normally closed contact opened, so as to cut off the power of the output circuit, thereby stopping charging;
when the output circuit is short-circuited, the second short-circuit protection device 52, i.e. the short-circuit monitoring relay, has its normally closed contact opened, so that the output circuit is powered off, and the charging is stopped;
when the overload problem occurs in the output circuit, the second overload relay 531 of the second overload protection device 53 triggers the second contactor 532, so that the output circuit is powered off, and the charging is stopped.
The output circuit refers to the lines of the second undervoltage protection device 51, the second short-circuit protection device 52 and the partial discharge detection device 6.
The step S1 and the step S2 are not in sequence, and the step S4 and the step S5 are not in sequence.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A power supply system for a partial discharge detection device comprises an electric engineering vehicle (1), and is characterized by further comprising a charging gun assembly (2) and a power supply conversion device, wherein the power supply conversion device comprises a power supply input protection device (3), an inversion device (4) and a power supply output protection device (5) which are sequentially and electrically connected, and the power supply output protection device (5) is used for being electrically connected with a partial discharge detection device (6); the input end of the charging gun assembly (2) is connected with the electric engineering vehicle (1), and the output end of the charging gun assembly (2) is connected with the power input protection device (3).
2. The power supply system for the partial discharge detection device according to claim 1, wherein the power output protection device (5) comprises a second overload protection device (53) and a second undervoltage protection device (51) and a second short-circuit protection device (52) electrically connected with the second overload protection device (53), the second undervoltage protection device (51) being electrically connected with the second short-circuit protection device (52); the second overload protection device (53) is electrically connected with the inverter device (4).
3. The power supply system for the partial discharge detection device according to claim 2, wherein the second overload protection device (53) includes a second overload relay (531) and a second contactor (532) electrically connected to the second overload relay (531); the second contactor (532) is electrically connected with the inverter device (4), the second undervoltage protection device (51) and the second short-circuit protection device (52), and the second overload relay (531) is electrically connected with the second undervoltage protection device (51) and the second short-circuit protection device (52).
4. The power supply system for an partial discharge detection device according to claim 2, wherein the second undervoltage protection device (51) is an undervoltage relay and the second short-circuit protection device (52) is a short-circuit monitoring relay.
5. The power supply system for the partial discharge detection device according to claim 2, wherein the power input protection device (3) comprises a first overload protection device (33), and a first undervoltage protection device (31) and a first short-circuit protection device (32) electrically connected with the first overload protection device (33), wherein the first undervoltage protection device (31) is electrically connected with the first short-circuit protection device (32); the first overload protection device (33) is electrically connected with the inverter device (4) and the charging gun assembly (2).
6. The power supply system for an partial discharge detection device according to claim 5, wherein the first overload protection device (33) includes a first overload relay (331) and a first contactor (332) electrically connected to the first overload relay (331); the first contactor (332) is electrically connected with the inverter device (4), the first under-voltage protection device (31) and the first short-circuit protection device (32); the first overload relay (331) is electrically connected with the charging gun assembly (2), the first undervoltage protection device (31) and the first short-circuit protection device (32).
7. The power supply system for partial discharge detection devices according to claim 5, characterized in that the charging gun assembly (2) comprises a first charging gun (21) for plugging the electric power engineering vehicle (1) and a second charging gun (22) for plugging the power input protection device (3), the first charging gun (21) being electrically connected with the second charging gun (22).
8. The power supply system for an partial discharge detection device according to claim 7, wherein the power input protection device (3) is electrically connected to the second charging gun (22) through a second charging gun socket (34).
9. The power supply system for the partial discharge detection device according to claim 7, wherein the electric power engineering truck (1) is provided with a first charging gun socket (11) for connecting with a first charging gun (21).
10. A power supply method applied to the power supply system for the partial discharge detection apparatus according to claim 7, characterized by comprising the steps of:
s1, connecting the first charging gun (21) with an electric engineering vehicle (1), and connecting the second charging gun (22) with a power input protection device (3);
s2, connecting the power output protection device (5) with a partial discharge detection device (6);
s3, starting a power supply of the electric engineering vehicle (1);
s4, when the input loop between the electric engineering truck (1) and the power input protection device (3) has the problems of undervoltage, short circuit or overload in the charging process, the first undervoltage protection device (31), the first short circuit protection device (32) and the first overload protection device (33) are correspondingly disconnected, so that the charging is stopped;
s5, when the output loop between the power output protection device (5) and the partial discharge detection device (6) has the problems of undervoltage, short circuit or overload in the charging process, the second undervoltage protection device (51), the second short circuit protection device (52) and the second overload protection device (53) are correspondingly disconnected, so that the charging is stopped;
the step S1 and the step S2 are not in sequence, and the step S4 and the step S5 are not in sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010799271.3A CN111934276A (en) | 2020-08-11 | 2020-08-11 | Power supply system for partial discharge detection device and power supply method thereof |
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| CN202010799271.3A CN111934276A (en) | 2020-08-11 | 2020-08-11 | Power supply system for partial discharge detection device and power supply method thereof |
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Application publication date: 20201113 |