CN108802631B - Method for detecting insulation of high-voltage system of power supply of contact network - Google Patents
Method for detecting insulation of high-voltage system of power supply of contact network Download PDFInfo
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- CN108802631B CN108802631B CN201810608018.8A CN201810608018A CN108802631B CN 108802631 B CN108802631 B CN 108802631B CN 201810608018 A CN201810608018 A CN 201810608018A CN 108802631 B CN108802631 B CN 108802631B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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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
- B60L5/00—Current collectors for power supply lines of electrically-propelled vehicles
- B60L5/18—Current collectors for power supply lines of electrically-propelled vehicles using bow-type collectors in contact with trolley wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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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
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- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention discloses an insulation detection method for a high-voltage system of a power supply of a contact network. The pantograph is in contact with a contact network, one end of a primary side of the high-voltage transformer is connected between the pantograph and the high-voltage circuit breaker, and the other end of the primary side of the high-voltage transformer is connected to the ground. The storage battery is connected to the secondary side of the high-voltage transformer through the inverter and the insulation detection power supply contactor in sequence. The high-voltage transformer is connected with the rectifier, a high-voltage chamber door is arranged between the high-voltage transformer and the rectifier, and the high-voltage system comprises an interlocking contact for reflecting the opening and closing state of the high-voltage chamber door. When the pantograph is in a pantograph descending state, the high-voltage isolating switch is in a disconnecting state and the high-voltage chamber door is in a closing state, the high-voltage system insulation detection can be carried out. The invention can solve the technical problems that the insulation of a high-voltage system is damaged, so that the system cannot work normally, further the contact net is tripped, even the contact net is blown, and the railway transportation is influenced.
Description
Technical Field
The invention relates to the field of railway electricity, in particular to an insulation detection method for a high-voltage system of a power supply of a contact network, which is applied to railway engineering operation vehicles.
Background
At present, with the continuous increase of the total mileage of railways in China, the workload of railway maintenance is increased day by day, large-scale road maintenance machinery becomes the main force of railway maintenance in China, and dozens of mechanized construction teams are actively on ten thousand railway lines every day. The construction teams work in the field all the year round, fight cold and fight hot summer, and make great contribution to the development of the railway industry in China, particularly to the speed increase of the railway in recent years. In order to solve the living problem of the railway maintenance motorcade in the field, each road bureau is provided with a camping train with the function of mechanized construction operation for the motorcade. These boarding trains are modified based on passenger train models and are provided with facilities such as sleeping rooms, kitchens and restaurants. In the prior art, patents such as CN205890886U, CN106080625A, CN202389375U, CN101386305B, CN201712613U, CN201283866Y, CN101386305A all give the structure of the camping train.
The camping train of mechanized construction team generally gets electricity from the stop station along the way, and is responsible for by the water and electricity section, and the time that the camping train stops at each station is all very short, and the water and electricity section must frequently come to the construction team and connect the electricity. And the stop stations along the way are all small stations, the transformer capacity on the small stations is small, and the large-capacity electric energy cannot be provided for the camping train, so the camping train is provided with a self-contained diesel generator set. Diesel generator sets are generally used to supply power to camping trains in many times, particularly when air conditioners are used in summer and winter. The diesel generating set generates electricity to consume a large amount of diesel, and meanwhile, the environment is seriously polluted, and noise emitted by the generating set also causes interference to constructors and surrounding residents. In addition, the capacity of the diesel generator set is not large, and many electric devices on the vehicle, such as an electromagnetic range, an electric shower, a refrigerator and the like, cannot be used. However, at present, the mileage of the railway electrification in China is increased at a very high speed every year, main trunk lines are basically electrified, the electrified railways are more and more, and if a set of system capable of directly taking electricity from a contact net is arranged on a mechanical construction camping train which often operates in an electrified section, the camping train can obtain large-capacity electric energy from the contact net no matter where the camping train stops, so that the trouble of frequent electricity connection of a hydroelectric section is avoided, and various defects of a diesel generator set are fundamentally overcome.
At present, in order to solve the technical problem of electricity consumption of the camping train, the camping train is generally provided with a contact network power supply, and the contact network voltage is converted into civil three-phase four-wire system voltage. The power supply of the contact network is subjected to current collection from the contact network by virtue of the pantograph, so that the control of the pantograph and the main circuit breaker is the key for safe and reliable operation of the system. The high-pressure system has a severe working environment and needs to bear the attack of sunshine, rain, frost, snow, wind and sand. The normal insulation is the premise of normal work of a high-voltage system, and the most prone fault of the high-voltage system is an insulation fault. If the high-voltage system is damaged in insulation, the system cannot work normally if the high-voltage system is damaged, and the contact net is tripped if the high-voltage system is damaged in insulation, even the contact net is blown, so that railway transportation is influenced. Therefore, the insulation of the high-voltage system needs to be checked frequently so as to ensure the normal work of the system and not influence the power supply of a railway contact network.
In the prior art, the electric locomotive has widely used the roof high-voltage insulation detection device at present, but the device is not suitable for the contact net power supply system, and its main reason is:
(1) the existing roof high-voltage insulation detection device and a high-voltage transformer are not interlocked from a circuit isolation signal, if the high-voltage transformer is not isolated from the circuit to carry out insulation detection, overcurrent protection of the high-voltage insulation device can be caused;
(2) the high voltage insulation detection device needs to be interlocked with a high voltage chamber door, and the existing roof high voltage insulation detection device does not have the interlocking signal interface.
Therefore, a high-voltage system of a power supply of the contact network and an insulation detection method thereof adopting a novel structure are required to be found according to special requirements of the power supply of the contact network.
Disclosure of Invention
In view of this, the invention aims to provide an insulation detection method for a high-voltage system of a power supply of a contact network, so as to solve the technical problem that the insulation of the high-voltage system is damaged, so that the system cannot work normally, and further the contact network is tripped or even blown, thereby affecting railway transportation.
In order to achieve the above object, the present invention specifically provides a technical implementation scheme of an insulation detection method for a high-voltage system of a power supply of a contact network, and the insulation detection method for the high-voltage system of the power supply of the contact network comprises the following steps: the device comprises a storage battery, an inverter, an insulation detection power supply contactor, a high-voltage transformer, a pantograph, a high-voltage circuit breaker, a high-voltage isolating switch and a high-voltage transformer. The pantograph, the high-voltage circuit breaker, the high-voltage isolating switch and the high-voltage transformer are sequentially connected. The pantograph is in contact with a contact network, one end of a primary side of the high-voltage transformer is connected between the pantograph and the high-voltage circuit breaker, and the other end of the primary side of the high-voltage transformer is connected to the ground. The storage battery is connected to the secondary side of the high-voltage transformer sequentially through the inverter and the insulation detection power supply contactor. The high-voltage transformer is connected with the rectifier, a high-voltage chamber door is arranged between the high-voltage transformer and the rectifier, and the high-voltage system further comprises a high-voltage chamber door interlocking contact which is connected with the high-voltage chamber door and used for reflecting the on-off state of the high-voltage chamber door. When the pantograph is in a pantograph descending state, the high-voltage isolating switch is in a disconnecting state and the high-voltage chamber door is in a closing state, the high-voltage system insulation detection can be carried out.
Preferably, the high voltage system insulation detection is performed by reading a voltage value of a secondary side of the high voltage potential transformer.
Preferably, when the insulation detection of the high-voltage system is carried out, the high-voltage transformer is isolated from the high-voltage system of the power supply of the overhead line system.
Preferably, the high voltage system comprises a pantograph rising/falling selection switch and a high voltage insulation detection switch. The method further comprises: and connecting the pantograph rising/falling selection switch with a high-voltage insulation detection switch. And connecting the high-voltage insulation detection switch with a control coil of the high-voltage isolating switch. When the pantograph lifting/pantograph lowering selection switch is in the pantograph lowering position, the high-voltage insulation detection switch is switched on, and the high-voltage isolation switch is controlled to be switched on and off through the high-voltage insulation detection switch.
Preferably, the method further comprises: and connecting a main contact of the insulation detection power supply contactor between the inverter and the high-voltage transformer. And connecting a first auxiliary contact of an isolating switch of the high-voltage isolating switch in series in a coil of the insulation detection power supply contactor, wherein the first auxiliary contact of the isolating switch is a normally closed contact. When the high-voltage system insulation detection is carried out, the high-voltage isolating switch is in an open position, the isolating switch first auxiliary contact is in a closed position, and the coil of the insulation detection power supply contactor is closed to carry out the insulation detection of the high-voltage system.
Preferably, when the high voltage system insulation test is performed, if the pantograph is subjected to a pantograph lifting operation or the high voltage system door is opened, the operation is disabled or the high voltage system insulation detection is interrupted.
Preferably, the method further comprises: and connecting the high-voltage chamber door interlocking contact in series in a coil of the insulation detection power supply contactor. When the high-voltage chamber door is opened, the interlocking contact of the high-voltage chamber door is disconnected, the coil of the insulation detection power supply contactor loses power, and the insulation detection of a high-voltage system is interrupted.
Preferably, the high pressure system further comprises a pantograph lifting valve for controlling the pantograph lifting/lowering bow. The method further comprises: and connecting the pantograph lifting valve with a second auxiliary contact of the insulation detection power supply contactor and a high-pressure chamber door interlocking contact in series, wherein the storage battery supplies power to the pantograph lifting valve through the second auxiliary contact and the high-pressure chamber door interlocking contact. When the high-voltage chamber door is opened to cause the interlocking contact of the high-voltage chamber door to be disconnected, or when the coil of the insulation detection power supply contactor is electrified to cause the second auxiliary contact to be disconnected, the pantograph lifting valve is electrified, and pantograph lifting operation of the pantograph lifting valve is ineffective.
Preferably, the method further comprises: and connecting the second auxiliary contact of the isolating switch of the high-voltage isolating switch in series in a closing coil of the high-voltage circuit breaker, wherein the high-voltage circuit breaker can be closed when the insulation detection of a high-voltage system is carried out. When the pantograph is raised and operating, the high-voltage circuit breaker must be closed after the high-voltage disconnector is closed in place.
Preferably, before the pantograph lifting operation, high-voltage system insulation detection is performed. And if the insulation fault of the high-voltage system is detected, forbidding the pantograph to carry out pantograph lifting operation, and after the insulation fault of the high-voltage system is detected and processed, the pantograph can only carry out pantograph lifting operation.
By implementing the technical scheme of the method for detecting the insulation of the high-voltage system of the power supply of the overhead line system, provided by the invention, the method has the following beneficial effects:
(1) the method for detecting the insulation of the high-voltage system of the power supply of the overhead line system can solve the technical problems that the system cannot normally work due to the damage of the insulation of the high-voltage system, so that the overhead line system trips, even the overhead line system is blown off, and the railway transportation is influenced;
(2) according to the insulation detection method for the high-voltage system of the power supply of the contact network, the high-voltage transformer is isolated by the high-voltage isolating switch, so that as many high-voltage devices as possible can be subjected to insulation detection, and particularly, a wall bushing with high failure rate can also be subjected to high-voltage insulation detection;
(3) according to the insulation detection method for the high-voltage system of the power supply of the contact network, the closing of the high-voltage chamber door is used as a starting condition for high-voltage insulation detection, so that high-voltage electric shock accidents caused by the fact that personnel mistakenly enter a high-voltage chamber can be avoided;
(4) according to the method for detecting the insulation of the high-voltage system of the power supply of the contact network, the isolation signal of the high-voltage transformer is used as the high-voltage insulation detection condition, so that the overload of the high-voltage insulation detection system can be avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other embodiments can be obtained from these drawings without inventive effort.
Fig. 1 is a circuit topology structure diagram of a specific embodiment of the insulation detection method for the high-voltage system of the power supply of the contact network of the invention;
fig. 2 is an insulation detection schematic block diagram of a specific embodiment of the insulation detection method for the high-voltage system of the power supply of the overhead line system according to the invention;
fig. 3 is a schematic diagram of a pantograph lifting control circuit of a specific embodiment of the insulation detection method for the high-voltage system of the power supply of the contact network of the invention;
FIG. 4 is a schematic diagram of a partial amplifier circuit of FIG. 1;
FIG. 5 is a schematic diagram of a partial amplifier circuit of another portion of FIG. 1;
in the figure: 1-accumulator, 2-filter, 3-inverter, 4-high voltage potential transformer, 5-contact network, 6-pantograph, 7-lightning arrester, 8-box, 9-high voltage circuit breaker, 10-wall bushing, 11-high voltage fuse, 12-high voltage chamber door interlocking contact, 13-high voltage transformer, 14-current transformer, 15-grounding clip, 16-rail, 17-rectifier, 18-inverter, 19-output switch, 20-load, 21-high voltage chamber door, 22-coil, 23-main contact, 24-first auxiliary contact, 25-second auxiliary contact, 26-control coil, PV-voltmeter, YV-pantograph-rising valve, QA 1-pantograph rising/pantograph-falling selection switch, QA 4-high voltage insulation detection switch, QS 1-high voltage isolating switch, KM 6-insulation detection power supply contactor, S5-insulation detection power supply breaker, QS 1-1-first auxiliary contact of high voltage isolating switch, and QS 1-2-second auxiliary contact of high voltage isolating switch.
Detailed Description
For reference and clarity, the terms, abbreviations or abbreviations used hereinafter are as follows:
a contactor: the contactor has the working principle that when a coil of the contactor is electrified, the coil current can generate a magnetic field, the generated magnetic field enables a static iron core to generate electromagnetic attraction to attract a movable iron core and drive a contactor contact to act, a normally closed contact is opened, a normally open contact is closed, and the normally closed contact and the normally open contact are linked. When the coil is powered off, the electromagnetic attraction disappears, the armature is released under the action of the release spring, the contact is restored, the normally open contact is disconnected, and the normally closed contact is closed. The AC contactor uses the main contact to control the circuit and uses the auxiliary contact to conduct the control loop. The primary contacts are typically normally open contacts and the secondary contacts typically have two pairs of normally open and normally closed contacts.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, specific embodiments of the insulation detection method for a high-voltage system of a power supply of a contact network according to the present invention are shown, and the present invention is further described below with reference to the drawings and the specific embodiments.
The high-voltage system of the power supply of the contact network is divided into a roof high-voltage system and an in-vehicle high-voltage system. The roof high-voltage system generally comprises a pantograph 6, an insulator (not shown in the figure), a lightning arrester 7, a high-voltage potential transformer 4, a high-voltage circuit breaker 9 and a wall bushing 10 (the upper part); the high-voltage system in the vehicle comprises a wall bushing 10 (the lower half part), a high-voltage fuse 11, a high-voltage isolating switch QS1 and a high-voltage transformer 13. Because the excitation current of the high-voltage transformer 13 is large and one end of the high-voltage side of the high-voltage transformer 13 is directly grounded, the high-voltage transformer 13 must be isolated from the high-voltage system of the power supply of the overhead line system when the insulation detection of the high-voltage system is performed. And then, whether the insulation of the high-voltage equipment is normal is confirmed, if the insulation of the high-voltage equipment is damaged, the pantograph lifting is forbidden, and the pantograph lifting can be carried out only after the insulation fault is checked and processed, so that the normal work of a high-voltage system is ensured, and the safety of a contact network 5 is ensured. As shown in fig. 2, the inverter 18 converts the DC110V voltage to AC120V single-phase alternating current. The secondary side of the high-voltage transformer 4 is used for transmitting AC120V voltage (the transformation ratio of the high-voltage transformer 4 is 250: 1), and single-phase alternating current of 30kV can be obtained on the primary side of the high-voltage transformer 4.
As shown in fig. 1, 4 and 5, an embodiment of a method for detecting insulation of a high-voltage system of a power supply of a contact network includes: the device comprises a storage battery 1, an inverter 3, an insulation detection power supply contactor KM6, a high-voltage transformer 4, a pantograph 6, a lightning arrester 7, a high-voltage circuit breaker 9, a high-voltage fuse 11, a high-voltage isolating switch QS1 and a high-voltage transformer 13. The pantograph 6, the high-voltage circuit breaker 9, the high-voltage fuse 11, the high-voltage isolating switch QS1 and the high-voltage transformer 13 are connected in sequence. The pantograph 6 is in contact with a contact network 5, one end of a primary side of the high-voltage transformer 4 is connected between the pantograph 6 and the high-voltage circuit breaker 9, and the other end of the primary side of the high-voltage transformer is connected to the ground. One end of the lightning arrester 7 is connected between the pantograph 6 and the high-voltage circuit breaker 9, and the other end is connected to the ground through the box 8. The storage battery 1 is connected to the secondary side of the high-voltage transformer 4 through the inverter 3 and the insulation detection power supply contactor KM6 in sequence. A wall bushing 10 is sleeved on the cable between the high-voltage circuit breaker 9 and the high-voltage fuse 11. The high-voltage transformer 13 is connected with the rectifier 17, a high-voltage chamber door 21 is arranged between the high-voltage transformer 13 and the rectifier 17, and the high-voltage system of the contact network power supply further comprises a high-voltage chamber door interlocking contact 12 which is connected with the high-voltage chamber door 21 and used for reflecting the on-off state of the high-voltage chamber door 21. In addition, one end of the input side of the high-voltage transformer 13 is connected with a high-voltage isolating switch QS1, and the other end is connected to a steel rail 16 through a current transformer 14 and a grounding clamp 15 in sequence. The rectifier 17, the inverter 18, the output switch 19, and the load 20 are connected in sequence. The battery 1 is connected to the inverter 3 via the filter 2, and an insulation detection power supply breaker S5 is connected between the battery 1 and the filter 2. The high-voltage system insulation detection can be performed when the pantograph 6 is in the pantograph lowering state, the high-voltage isolating switch QS1 is in the off state, and the high-voltage chamber door 21 is in the closed state at the same time.
As shown in fig. 2 and 4, the high voltage system insulation detection can be performed by connecting a voltmeter PV to the secondary side of the high voltage potential transformer 4 and reading the voltage value thereof. If the high voltage system is well insulated from ground, the high voltage system equivalent resistance to ground R is infinite (relative to the current limiting resistance R11), and the reading at the voltage pointer PV should be around 120V. If the insulation of the high-voltage device to the ground is damaged, the value of the equivalent resistor R is sharply reduced, the current of the high-voltage part to the ground is increased, the primary side current of the high-voltage potential transformer 4 is increased, the secondary side current is synchronously increased by 250 times, the partial voltage on the current-limiting resistor R11 is also increased, and the reading of the voltmeter PV is reduced. Whether the insulation of the high-voltage component is damaged or not can be judged according to the reading of the voltmeter PV, and meanwhile, the secondary side voltage of the high-voltage potential transformer 4 can be sent back to the control system for recording and processing.
The high-voltage system of the power supply of the contact net further comprises a pantograph rising/lowering selection switch QA1 (two-position self-locking) and a high-voltage insulation detection switch QA4 (three-position non-self-locking with a lamp). The high-voltage system insulation detection method further comprises the following steps: the up/down switch QA1 is connected to a high voltage insulation detection switch QA4, and the high voltage insulation detection switch QA4 is connected to the control coil 26 of a high voltage isolation switch QS 1. When the pantograph rising/falling selection switch QA1 is in the pantograph falling position, the high-voltage insulation detection switch QA4 is switched on, and the high-voltage isolation switch QS1 is controlled to be switched on and off through the high-voltage insulation detection switch QA 4.
The high-voltage system insulation detection method further comprises the following steps: the main contact 23 of the insulation detection power supply contactor KM6 is connected between the inverter 3 and the high-voltage potential transformer 4, and when the insulation detection of a high-voltage system is carried out, a high-voltage isolating switch QS1 is required to be disconnected, the implementation method is that a first auxiliary contact QS1-1 of an isolating switch of the high-voltage isolating switch QS1 is connected in series in a coil 22 of the insulation detection power supply contactor KM6, and the first auxiliary contact QS1-1 of the isolating switch is a normally closed contact. When the high-voltage system insulation detection is carried out, the high-voltage isolating switch QS1 is in an open position, the first auxiliary contact QS1-1 of the isolating switch is in a closed position, and the coil 22 of the insulation detection power supply contactor KM6 is closed to carry out the high-voltage system insulation detection.
The high-voltage system insulation detection method further comprises the following steps: the high-voltage chamber door interlock contact 12 was connected in series in the coil 22 of the insulation detection power supply contactor KM 6. When the high-voltage chamber door 21 is opened, the high-voltage chamber door interlocking contact 12 is opened, as shown in fig. 3 and fig. 4, the point B is de-energized, the coil 22 of the insulation detection power supply contactor KM6 is de-energized, and the high-voltage system insulation detection is interrupted. In performing the high-voltage system insulation test, if the pantograph 6 performs a pantograph lifting operation or the high-voltage chamber door 21 is opened, the operation is disabled or the high-voltage system insulation detection is interrupted.
As shown in fig. 3, the high-pressure system further includes a pantograph raising valve YV for controlling the pantograph raising and lowering of the pantograph 6. The high-voltage system insulation detection method further comprises the following steps: the pantograph lifting valve YV is connected in series with the second auxiliary contact 25 of the insulation detection power supply contactor KM6 and the high-pressure chamber door interlocking contact 12, and the storage battery 1 supplies power to the pantograph lifting valve YV through the second auxiliary contact 25 and the high-pressure chamber door interlocking contact 12. When the high-voltage chamber door 21 is opened to cause the high-voltage chamber door interlocking contact 12 to be opened, or when the coil 22 of the insulation detection power supply contactor KM6 is energized to cause the second auxiliary contact 25 to be opened, the pantograph-raising valve YV is de-energized, and the pantograph-raising operation of the pantograph-raising valve YV is disabled.
The high-voltage system insulation detection method further comprises the following steps: the second auxiliary disconnector contact QS1-2 of the high-voltage disconnector QS1 is connected in series with the closing coil HZ (FZ in the figure is the opening coil) of the high-voltage circuit breaker 9. When performing a high voltage system insulation check, the high voltage circuit breaker 9 can be closed. When the pantograph 6 is pantograph raised and operating, the high voltage circuit breaker 9 must be closed after the high voltage disconnect QS1 is closed in place. In fig. 5, QA2 is a high-voltage breaker control switch, and KA1 is a relay.
Before the pantograph 6 is subjected to pantograph lifting operation, high-voltage system insulation detection is carried out. If the insulation fault of the high-voltage system is detected, the pantograph 6 is prohibited from carrying out pantograph lifting operation, and after the insulation fault of the high-voltage system is detected and processed, the pantograph 6 can carry out pantograph lifting operation.
By implementing the technical scheme of the method for detecting the insulation of the high-voltage system of the power supply of the overhead line system, which is described in the specific embodiment of the invention, the following technical effects can be achieved:
(1) the method for detecting the insulation of the high-voltage system of the power supply of the overhead line system, which is described in the specific embodiment of the invention, can solve the technical problems that the system cannot normally work due to the insulation damage of the high-voltage system, so that the overhead line system is tripped, even the overhead line system is blown off, and the railway transportation is influenced;
(2) according to the insulation detection method for the high-voltage system of the power supply of the overhead line system, which is described in the specific embodiment of the invention, the high-voltage transformer is isolated by the high-voltage isolating switch, so that as many high-voltage devices as possible can be subjected to insulation detection, and particularly, a wall bushing with a high failure rate can also be subjected to high-voltage insulation detection;
(3) according to the insulation detection method for the high-voltage system of the power supply of the overhead line system, which is described in the specific embodiment of the invention, the closing of the high-voltage chamber door is used as a starting condition for high-voltage insulation detection, so that high-voltage electric shock accidents caused by the fact that personnel mistakenly enter a high-voltage chamber can be avoided;
(4) according to the method for detecting the insulation of the high-voltage system of the power supply of the overhead line system, which is described in the specific embodiment of the invention, the isolation signal of the high-voltage transformer is used as the high-voltage insulation detection condition, so that the overload of the high-voltage insulation detection system can be avoided.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (9)
1. The method for detecting the insulation of the high-voltage system of the power supply of the contact network is characterized by comprising the following steps of: the device comprises a storage battery (1), an inverter (3), an insulation detection power supply contactor (KM6), a high-voltage transformer (4), a pantograph (6), a high-voltage circuit breaker (9), a high-voltage isolating switch (QS1) and a high-voltage transformer (13); the pantograph (6), the high-voltage circuit breaker (9), the high-voltage isolating switch (QS1) and the high-voltage transformer (13) are sequentially connected; the pantograph (6) is in contact with a contact network (5), one end of a primary side of the high-voltage transformer (4) is connected between the pantograph (6) and the high-voltage circuit breaker (9), and the other end of the primary side of the high-voltage transformer is connected to the ground; the storage battery (1) is connected to the secondary side of the high-voltage transformer (4) sequentially through an inverter (3) and an insulation detection power supply contactor (KM 6); the high-voltage transformer (13) is connected with the rectifier (17), a high-voltage chamber door (21) is arranged between the high-voltage transformer (13) and the rectifier (17), and the high-voltage system further comprises a high-voltage chamber door interlocking contact (12) which is connected with the high-voltage chamber door (21) and used for reflecting the opening and closing state of the high-voltage chamber door (21); when the pantograph (6) is in a pantograph descending state, the high-voltage isolating switch (QS1) is in an off state and the high-voltage chamber door (21) is in a closed state, the high-voltage system insulation detection can be carried out; the method further comprises: connecting a main contact (23) of the insulation detection power supply contactor (KM6) between the inverter (3) and a high-voltage transformer (4); connecting a first auxiliary isolating switch contact (QS1-1) of the high-voltage isolating switch (QS1) in series in a coil (22) of an insulation detection power supply contactor (KM6), wherein the first auxiliary isolating switch contact (QS1-1) is a normally closed contact; when the high-voltage system insulation detection is carried out, the high-voltage isolating switch (QS1) is in an open position, the isolating switch first auxiliary contact (QS1-1) is in a closed position, and the coil (22) of the insulation detection power supply contactor (KM6) is closed to carry out the high-voltage system insulation detection.
2. The method for detecting the insulation of the high-voltage system of the power supply of the overhead line system according to claim 1, wherein the method comprises the following steps: and (3) reading the voltage value of the secondary side of the high-voltage transformer (4) to detect the insulation of the high-voltage system.
3. The method for detecting the insulation of the high-voltage system of the power supply of the overhead line system according to claim 1 or 2, which is characterized in that: and when the insulation of the high-voltage system is detected, the high-voltage transformer (13) is isolated from the high-voltage system of the power supply of the contact network.
4. The method for detecting the insulation of the high-voltage system of the power supply source of the contact network as claimed in claim 3, wherein the high-voltage system comprises a pantograph rising/falling selection switch (QA1) and a high-voltage insulation detection switch (QA 4); the method further comprises:
connecting said pantograph up/down selector switch (QA1) to a high voltage insulation detection switch (QA 4);
-connecting said high voltage insulation detection switch (QA4) to a control coil (26) of a high voltage disconnector (QS 1);
when the pantograph rising/falling selection switch (QA1) is in a pantograph falling position, the high-voltage insulation detection switch (QA4) is switched on, and the high-voltage isolation switch (QS1) is controlled to be switched on and off through the high-voltage insulation detection switch (QA 4).
5. The method for detecting the insulation of the high-voltage system of the power supply of the overhead line system according to claim 1, 2 or 4, wherein the method comprises the following steps: when a high-voltage system insulation test is performed, if the pantograph (6) performs a pantograph lifting operation or the high-voltage chamber door (21) is opened, the operation is invalid or the high-voltage system insulation detection is interrupted.
6. The method for detecting the insulation of the high-voltage system of the power supply of the overhead line system according to claim 5, further comprising the following steps:
connecting the high-voltage chamber door interlocking contact (12) in series in a coil (22) of the insulation detection power supply contactor (KM 6);
when the high-voltage chamber door (21) is opened, the high-voltage chamber door interlocking contact (12) is opened, the coil (22) of the insulation detection power supply contactor (KM6) loses power, and the insulation detection of a high-voltage system is interrupted.
7. The catenary power supply high-voltage system insulation detection method according to claim 1, 2, 4 or 6, characterized in that the high-voltage system further comprises a pantograph lifting valve (YV) for controlling the pantograph lifting of the pantograph (6); the method further comprises:
connecting the pantograph lifting valve (YV) with a second auxiliary contact (25) of the insulation detection power supply contactor (KM6) and a high-voltage chamber door interlocking contact (12) in series, wherein the storage battery (1) supplies power to the pantograph lifting valve (YV) through the second auxiliary contact (25) and the high-voltage chamber door interlocking contact (12);
when the high-voltage chamber door (21) is opened to cause the high-voltage chamber door interlocking contact (12) to be opened, or when the coil (22) of the insulation detection power supply contactor (KM6) is electrified to cause the second auxiliary contact (25) to be opened, the pantograph rising valve (YV) is de-electrified, and pantograph rising operation of the pantograph rising valve (YV) is ineffective.
8. The method for detecting the insulation of the high-voltage system of the power supply of the overhead line system according to claim 7, wherein the method comprises the following steps: before the pantograph lifting operation of the pantograph (6), carrying out high-voltage system insulation detection; and if the high-voltage system insulation fault is detected, forbidding the pantograph (6) to carry out pantograph lifting operation, and after the high-voltage system insulation fault is checked and processed, the pantograph (6) can carry out pantograph lifting operation.
9. The method for detecting the insulation of the high-voltage system of the power supply of the overhead line system according to claim 1, 2, 4, 6 or 8, wherein the method further comprises the following steps:
connecting a second auxiliary disconnector contact (QS1-2) of the high-voltage disconnector (QS1) in series with a closing coil (HZ) of the high-voltage circuit breaker (9), the high-voltage circuit breaker (9) being capable of closing when a high-voltage system insulation test is performed;
when the pantograph (6) is pantograph-raised and operating, the high voltage circuit breaker (9) must be closed after the high voltage disconnect switch (QS1) is closed in place.
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| CN201810608018.8A CN108802631B (en) | 2018-06-13 | 2018-06-13 | Method for detecting insulation of high-voltage system of power supply of contact network |
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| CN201810608018.8A CN108802631B (en) | 2018-06-13 | 2018-06-13 | Method for detecting insulation of high-voltage system of power supply of contact network |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111308297A (en) * | 2018-12-12 | 2020-06-19 | 中车唐山机车车辆有限公司 | Insulation detection device |
| CN112904165B (en) * | 2021-01-20 | 2022-10-28 | 中车青岛四方机车车辆股份有限公司 | Train insulation detection system and direct current power supply train |
| CN113238124B (en) * | 2021-03-29 | 2022-09-13 | 中车青岛四方机车车辆股份有限公司 | Alternating current insulation detection system and method and railway vehicle |
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