CN111308297A - Insulation detection device - Google Patents
Insulation detection device Download PDFInfo
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- CN111308297A CN111308297A CN201811518695.7A CN201811518695A CN111308297A CN 111308297 A CN111308297 A CN 111308297A CN 201811518695 A CN201811518695 A CN 201811518695A CN 111308297 A CN111308297 A CN 111308297A
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- 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
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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Abstract
The invention provides an insulation detection device, which is used for detecting the insulation performance of a high-voltage system of a rail train, wherein the high-voltage system comprises a voltage transformer and a high-voltage side assembly electrically connected with a primary side coil of the voltage transformer, and the insulation detection device comprises an alternating current power supply module and a detection module; the alternating current power supply module is used for being electrically connected with a secondary side coil of the voltage transformer to form a power supply loop for providing a test voltage for a primary side coil; the detection module is electrically connected with the alternating current power supply module and is used for detecting the output power of the alternating current power supply module; if the output power is larger than the preset power value, the insulation performance of the high-voltage system is poor. The insulation detection device can accurately detect the insulation condition of the high-voltage system, effectively avoids the damage of the high-voltage system electrical equipment and the pantograph net caused by the blind pantograph lifting of the high-voltage system under the condition of poor insulation, has a simple structure, is simple and convenient to judge the insulation condition, and effectively improves the working efficiency.
Description
Technical Field
The embodiment of the invention relates to the electronic and electrical technology, in particular to an insulation detection device.
Background
The motor train unit is one of the main transportation tools for people to go out at present, and has the advantages of large passenger capacity, quickness, high efficiency and the like. The high-voltage system is used as a power supply system of the motor train unit and is a key system for ensuring safe and reliable operation of the motor train unit. Because the high-voltage equipment in the high-voltage system of the top of the motor train unit is more and is completely exposed in the external environment, the insulation performance of the high-voltage system is greatly influenced by the drastic change of the natural environment, and therefore the insulation condition of the high-voltage system of the top of the motor train unit needs to be tracked and analyzed in real time to ensure the reliable work of the high-voltage system.
At present, an operator simply judges the insulation condition of high-voltage equipment on the top of a motor train unit by observing the damage condition of insulators of all equipment in a high-voltage system, but the appearance of the insulators only influences the insulation performance of the high-voltage system, and the method cannot accurately judge the insulation performance of the high-voltage system of the motor train unit.
Disclosure of Invention
The invention provides an insulation detection device, which aims to solve the problem that the insulation performance of a high-voltage system of a motor train unit cannot be accurately judged by the conventional detection means.
The invention provides an insulation detection device, which is used for detecting the insulation performance of a high-voltage system of a rail train, wherein the high-voltage system comprises a voltage transformer and a high-voltage side assembly electrically connected with a primary side coil of the voltage transformer, and the insulation detection device comprises an alternating current power supply module and a detection module;
the alternating current power supply module is electrically connected with a secondary side coil of the voltage transformer to form a power supply loop for providing a test voltage for the primary side coil;
the detection module is electrically connected with the alternating current power supply module and is used for detecting the output power of the alternating current power supply module;
and if the output power is greater than a preset power value, the insulation performance of the high-voltage system is poor.
Optionally, the ac power supply module includes an inverter and a dc power supply, an output end of the dc power supply is electrically connected to an input end of the inverter, and an output end of the inverter is electrically connected to an input end of the secondary side coil.
Optionally, the ac power supply module further includes a transformer, an input end of the transformer is electrically connected to an output end of the inverter, and an output end of the transformer is electrically connected to an input end of the secondary side coil.
Optionally, the detection module includes a current sensor and a voltage sensor, and the current sensor is connected in series between the dc power supply and the inverter; the voltage sensor is connected in parallel with the direct current power supply.
Optionally, the current sensor is an ammeter, and the voltage sensor is a voltmeter.
Optionally, the voltmeter is integrated with the inverter.
Optionally, the insulation detection device further includes a controller, and the controller is in communication connection with the dc power supply and is configured to control the dc power supply to increase the output voltage step by step.
Optionally, the insulation detection device further includes an alarm module, and the alarm module is configured to send an alarm signal when the power value output by the ac power supply module is greater than a preset power value.
Optionally, the insulation detection device further includes a fuse, and the fuse is connected in series in the power supply loop.
Optionally, the insulation detecting device further includes a relay, and the relay includes: the normally open contact is connected in series with the power supply circuit; the normally closed contact is used for being connected in series with a pantograph lifting loop of the high-voltage system, and the normally closed contact and the normally open contact are arranged in parallel.
The invention provides an insulation detection device, which is used for detecting the insulation performance of a high-voltage system of a rail train, wherein the high-voltage system comprises a voltage transformer and a high-voltage side assembly electrically connected with a primary side coil of the voltage transformer, and the insulation detection device comprises an alternating current power supply module and a detection module; the alternating current power supply module is used for being electrically connected with a secondary side coil of the voltage transformer to form a power supply loop for providing a test voltage for a primary side coil; the detection module is electrically connected with the alternating current power supply module and is used for detecting the output power of the alternating current power supply module; if the output power is larger than the preset power value, the insulation performance of the high-voltage system is poor. According to the invention, the secondary side coil of the voltage transformer of the high-voltage system is connected with the alternating current power supply module in series, then, through the induction of the primary side coil of the voltage transformer, a test voltage can be formed on the high-voltage side assembly electrically connected with the primary side coil, and whether the high-voltage side assembly has the electric leakage condition can be represented through the output power loss of the alternating current power supply module, so that the insulation performance of the high-voltage system can be determined. The insulation detection device can accurately detect the insulation condition of the high-voltage system, effectively avoids the damage of the high-voltage system electrical equipment and the pantograph net caused by the blind pantograph lifting of the high-voltage system under the condition of poor insulation, has a simple structure, is simple and convenient to judge the insulation condition, and effectively improves the working efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is an assembly view of an insulation detection device provided by an embodiment of the present invention;
fig. 2 is a schematic view of a first structure of an ac power supply module in the insulation detection apparatus according to the embodiment of the present invention;
fig. 3 is a circuit diagram of an insulation detecting apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an insulation detection apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an ac power supply module of the insulation detection apparatus according to the embodiment of the present invention;
fig. 6 is a schematic structural diagram of an ac power supply module of the insulation detection apparatus according to the embodiment of the present invention.
Description of reference numerals:
1-insulation detection device;
11-an alternating current power supply module;
111-an inverter;
112-a direct current power supply;
113-a transformer;
12-a detection module;
121-current sensor;
122 — a voltage sensor;
13-a controller;
14-an alarm module;
15-a fuse;
16-a relay;
161-normally open contacts;
162-normally closed contact;
2-high pressure system;
21-a voltage transformer;
211 — primary side coil;
212 — secondary side coil;
22-pantograph;
23-vacuum circuit breaker;
24-a lightning arrester;
25-a grounding switch;
26-a catenary;
27-Bow raising loop.
Detailed Description
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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, "a plurality" means two or more unless specifically stated otherwise.
The motor train unit is one of the main transportation tools for people to go out at present, and has the advantages of large passenger capacity, quickness, high efficiency and the like. The high-voltage system is used as a power supply system of the motor train unit and is a key system for ensuring safe and reliable operation of the motor train unit. Because the altitude difference of China is large and the difference of the north and south environments is obvious, the insulation performance of a high-voltage system on the top of a motor train unit needs to adapt to different environments, and the insulation performance of the high-voltage system must be capable of bearing overvoltage from the system within the design life without permanent failure.
Because the high-voltage equipment in the high-voltage system of the top of the motor train unit is more and is completely exposed in the external environment, the insulation performance of the high-voltage system is greatly influenced by the drastic change of the natural environment, and therefore the insulation condition of the high-voltage system of the top of the motor train unit needs to be tracked and analyzed in real time to ensure the reliable work of the high-voltage system.
At present, in order to ensure that the insulation performance of each part of a high-voltage system is good, an operator adopts a means in routine maintenance to simply judge the insulation condition of high-voltage equipment on the top of a motor train unit by observing the damage condition of insulators of each equipment in the high-voltage system, and then the insulators with damages, cracks and the like are replaced to ensure that the insulation performance of the high-voltage system is in a good state. However, the insulator is only one aspect affecting the insulation performance of the high-voltage system, and the method cannot accurately judge the insulation performance of the high-voltage system of the motor train unit.
In order to overcome the above defects in the prior art, the embodiment provides an insulation detection device, which can accurately detect the insulation condition of a high-voltage system, and effectively avoid the high-voltage system from being damaged by blind pantograph lifting under the condition of poor insulation.
FIG. 1 is an assembly view of an insulation detection device provided by an embodiment of the present invention; fig. 2 is a schematic view of a first structure of an ac power supply module in the insulation detection apparatus according to the embodiment of the present invention; fig. 3 is a circuit diagram of an insulation detecting apparatus according to an embodiment of the present invention; fig. 4 is a schematic diagram of an insulation detecting apparatus according to an embodiment of the present invention.
Referring to fig. 1 to 4, the present embodiment provides an insulation detecting apparatus 1 for detecting insulation performance of a high voltage system 2 of a rail train, wherein the high voltage system 2 includes a voltage transformer 21 and a high voltage side component electrically connected to a primary side coil 211 of the voltage transformer 21, and the insulation detecting apparatus 1 includes an ac power supply module 11 and a detecting module 12; the alternating current power supply module 11 is used for being electrically connected with a secondary side coil 212 of the voltage transformer 21 so as to form a power supply loop for providing a test voltage for the primary side coil 211; the detection module 12 is electrically connected with the alternating current power supply module 11 and is used for detecting the output power of the alternating current power supply module 11; if the output power is greater than the preset power value, the insulation performance of the high-voltage system 2 is not good.
Specifically, the high-voltage system 2 of the motor train unit mainly functions to provide energy for the traction system and the auxiliary system under the condition of realizing good current collection, and simultaneously prevents lightning overvoltage and operation overvoltage, and plays a role in protecting the traction system. The high-voltage system 2 comprises a voltage transformer 21 and a high-voltage side component, and the high-voltage side component mainly comprises high-voltage components such as a pantograph 22, a vacuum circuit breaker 23, a lightning arrester 24, a grounding switch 25 and a contact network 26. The high-voltage side component is electrically connected to the primary winding 211 of the voltage transformer 21. When the high-voltage system 1 normally works, the pantograph 22 contacts with the overhead line system 26, transmits the voltage on the overhead line system 26 to the primary side of the voltage transformer 21, and changes the high voltage in the high-voltage system 2 into low voltage through the voltage transformer 21 so as to monitor the voltage of the overhead line system 26.
The good insulation performance of the high voltage system 2 is a prerequisite for ensuring the normal operation thereof. When the insulation performance of the equipment in the high-voltage system 2 is good, and the high-voltage system 2 is in a pantograph-ascending state, the circuit in the high-voltage system 2 is insulated to the ground, so that the high-voltage system 2 can normally work; when the insulation performance of the equipment in the high-voltage system 2 is poor and even a high-voltage short circuit occurs, under a pantograph state, the current in the high-voltage system 2 is too large, so that high-power loss is caused, and each component in the high-voltage system 2 is damaged, so that the high-voltage system 2 cannot work normally.
Therefore, in order to accurately detect the insulation performance of the high voltage system 2, the insulation detecting device 1 is electrically connected to the voltage transformer 21 in the high voltage system 2. Referring to fig. 1, the insulation detecting apparatus 1 includes an ac power supply module 11, and the ac power supply module 11 is electrically connected to a secondary side coil 212 of a voltage transformer 21, so that the ac power supply module 11 and the secondary side coil 212 of the voltage transformer 21 form a power supply loop. The ac power supply module 11 is further electrically connected to a detection module 12, and the detection module 12 is configured to detect an output power of the ac power supply module 11.
Specifically, when the insulation performance of the high voltage system 2 is detected, the pantograph 22 of the high voltage system 2 is in a pantograph-descending state, the ac power supply module 11 supplies a low voltage to the secondary side coil 212 of the voltage transformer 21, and the voltage transformer 21 boosts the low voltage to form a high voltage on the primary side coil 211, that is, a test voltage flowing through the high voltage side components of the high voltage system 2. When the voltage transformer 21 and the high-voltage side components in the high-voltage system 2 have good insulation performance, the circuit in the high-voltage system 2 has no power loss, that is, the alternating current power supply module 11 has no power output; when the insulation performance of the voltage transformer 21 and the high-voltage side components in the high-voltage system 2 is poor, the impedance is increased at a poor position, so that the power loss of a circuit in the high-voltage system 2 is rapidly increased, according to the energy conservation principle, the alternating-current power supply module 11 correspondingly outputs high power, and the power lost by the high-voltage system 2 is basically consistent with the output power of the alternating-current power supply module 11. In order to accurately judge the insulation performance of the high-voltage system 2, the output power of the ac power supply module 11 is compared with a preset power value, and when the output power of the ac power supply module 11 is greater than the preset power value, it indicates that the insulation performance of the high-voltage system 2 is not good.
The preset power value is not less than the power loss value of the high-voltage system 2 when the insulation performance is good, and the high-voltage system 2 has substantially no power loss when the insulation performance is good, so that the preset power value can be determined according to a test value or an empirical value.
When the insulation performance of the high-voltage system 2 is detected by the insulation detection device 1, the pantograph 22 in the high-voltage system 2 is in a parking pantograph-descending working condition, the vacuum circuit breaker 23 is disconnected, and the high-voltage system 2 is in a circuit-breaking state when the insulation performance is good, in other words, no current passes through the circuit when the insulation performance of the high-voltage system 2 is good; when the insulation performance of the high-voltage system 2 is not good, a loop is formed between the equipment in the high-voltage system 2 and the ground, and further, an obvious current passes through the loop, and a certain current is generated on the power supply loop on the insulation detection device 1, so that the insulation performance of the high-voltage system 2 can be determined by detecting the output current change of the alternating current power supply module 11, that is, when the output current exists on the alternating current power supply module 11, the insulation performance of the high-voltage system 2 is not good.
Before the insulation detection device 1 of the present embodiment works, the voltage of the voltage transformer 21 of the high voltage system 2 needs to be released, so as to ensure that the voltage on the voltage transformer 21 is lower than 3000V, and avoid the influence of the voltage on the voltage transformer 21 on the detection result; in addition, before the insulation detection device 1 works, the alternating current power supply module 11 and the detection module 12 in the insulation detection device 1 need to be checked to ensure that the working performance of the insulation detection device 1 is good, and the self-checking time is not more than 30s generally.
Referring to fig. 4, the insulation detecting device 1 of the present embodiment may be installed in a vehicle to facilitate the operation of the insulation detecting device 1.
The insulation detection device 1 of this embodiment can accurately detect the insulating condition of high voltage system 2, and the effectual high voltage system 2 of having avoided under the bad condition of insulation blind rise the bow and cause the damage to high voltage system 2's electrical equipment and bow net for high voltage system 2 can normally work, and then has ensured the safety and the stability of circuit operation. Meanwhile, the insulation detection device 1 directly utilizes the voltage transformer 21 on the motor train unit to boost reversely, so that test voltage is provided for a high-voltage side assembly, new equipment does not need to be added, the manufacturing cost and the detection cost of the insulation detection device 1 are effectively saved, the weight of the insulation detection device 1 is reduced, the structure of the insulation detection device 1 provided by the embodiment is simple, the assembly is more convenient, and the working efficiency is effectively improved.
Referring to fig. 2 and 3, in order to facilitate the connection of the ac power supply module 11, the ac power supply module 11 in the present embodiment may include an inverter 111 and a dc power supply 112, wherein an output terminal of the dc power supply 112 is electrically connected to an input terminal of the inverter 111, and an output terminal of the inverter 111 is configured to be electrically connected to an input terminal of the secondary side coil 212. The dc power supply 112 may be a dc power supply on the motor train unit, i.e., a dc battery.
Specifically, the inverter 111 inverts the 110V dc of the dc power supply 112 of the motor train unit into a 50Hz ac power supply, and connects the ac power supply to the secondary coil 212 of the voltage transformer 21, so that a high voltage test voltage is formed on the primary coil 211 of the voltage transformer 21, thereby detecting the insulation state of the voltage transformer 21 and the high voltage side components. The insulation detection device 1 of this embodiment directly adopts the direct current power supply of the motor train unit itself to provide the low voltage for the secondary side coil 212 of the voltage transformer 21 to realize the detection of the insulation performance of the high voltage system 2, and no external power supply is needed, so that the access of the alternating current power supply module 11 is more convenient, and the detection efficiency of the insulation detection device 1 is improved. And the insulation detection device 1 directly adopts the direct current power supply of the motor train unit to provide voltage for the voltage transformer 21, so that the manufacturing cost of the insulation detection device 1 is further reduced.
The detection module 12 in this embodiment may include a current sensor 121 and a voltage sensor 122, where the current sensor 121 is connected in series between the dc power supply 112 and the inverter 111, and is configured to detect a current value on the power supply loop; the voltage sensor is connected in parallel with the dc power supply 112 and is configured to detect a voltage value output by the dc power supply 112. The current value and the voltage value of the power supply loop are detected by the current sensor 121 and the voltage sensor 122, respectively, so as to determine the power value of the dc power supply 112 output to the voltage transformer 21 through the inverter 111, and the insulation performance of the high voltage system 2 is determined by judging the magnitude relation between the output power and the preset power value. The current sensor 121 and the voltage sensor 122 are arranged to make the determination of the output power of the ac power supply module 11 faster and more accurate, so as to effectively improve the insulation performance detection efficiency and the detection accuracy of the insulation detection device 1 of the embodiment, thereby avoiding the problem that each device and the pantograph-catenary of the high-voltage system 2 are damaged due to blind pantograph-lifting under the condition of poor insulation or even high-voltage short circuit, preventing the occurrence of safety accidents, and simultaneously reducing the economic loss.
The current sensor 121 may be an ammeter, and the voltage sensor 112 may be a voltmeter, so that the structure of the detection module 12 is simpler and the manufacturing cost of the insulation detection device 1 is saved on the basis of ensuring the accuracy of the output power of the ac power supply module 11. Among them, the voltmeter and the inverter 111 may be integrated to simplify the structure of the insulation detecting apparatus 1, and facilitate the installation of the insulation detecting apparatus 1.
In order to facilitate reading of the output power, a display panel (not shown in the figure) may be disposed on the insulation detection apparatus 1 of this embodiment, the current value of the current sensor 121 and the voltage value of the voltage sensor 122 are directly displayed through the display panel, which is convenient for directly reading the current value and the voltage value, and meanwhile, the output power of the dc power supply 112 is directly displayed on the display panel through the operation of a software program or a logic circuit, and a preset power value may also be directly displayed on the display panel, so as to perform intuitive and rapid comparison between the output power of the dc power supply 112 and the preset power value, so as to determine the insulation state of the high voltage system 2, thereby not only improving the observation efficiency of the output power of the ac power supply module 11, but also making the output power more accurate. Of course, this embodiment does not exclude the way of directly displaying the final comparison result on the display panel.
Fig. 5 is a schematic diagram of a second structure of an ac power supply module of the insulation detection apparatus provided in this embodiment. As shown in fig. 5, in order to further determine the maximum voltage that the high voltage system 2 can withstand when the insulation performance is good. The ac power supply module 11 of the present embodiment may further include a transformer 113, an input end of the transformer 113 is electrically connected to an output end of the inverter 111, and an output end of the transformer 113 is configured to be electrically connected to an input end of the secondary winding 212.
Specifically, since the insulation performance of the high voltage system 2 is related to the operating voltage, in other words, when the operating voltage of the high voltage system 2 is low, the insulation performance of the high voltage system 2 is in a good state, but when the operating voltage of the high voltage system 2 is high, it cannot be guaranteed that the insulation performance of the high voltage system 2 is in a good state at this time, and therefore, in order to guarantee that the insulation performance of the high voltage system 2 can adapt to the high operating voltage, the insulation state of the high voltage system 2 under the high operating voltage needs to be detected.
In the embodiment, the voltage value output by the inverter 111 to the secondary coil 212 of the voltage transformer 21 is continuously increased by the transformer 113 to increase the test voltage on the primary coil 211 of the voltage transformer 21, and the insulation state of the high voltage system 2 is determined by detecting the output power of the corresponding transformer 113 under each test voltage, so that the maximum voltage that the high voltage system 2 can bear when the insulation performance is good is determined, and the normal operation of the high voltage system 2 is further ensured.
Fig. 6 is a schematic structural diagram of an ac power supply module of the insulation detection apparatus according to the present embodiment. As shown in fig. 6, in order to increase the test voltage on the primary coil 211 of the voltage transformer 21, in addition to the mode of electrically connecting the transformer 113 to the output terminal of the inverter 111, the controller 13 may be connected to the dc power supply 112 in a communication manner, and the controller 13 may increase the output voltage of the dc power supply 112 step by step, so that the voltage applied to the secondary coil 212 of the voltage transformer 21 by the dc power supply 112 via the inverter 111 is increased step by step, and the test voltage of the primary coil 211 of the voltage transformer 21 is increased accordingly. The insulation state of the high-voltage system 2 is determined by detecting the output power of the corresponding dc power supply 112 at each test voltage, so as to determine the maximum voltage that the high-voltage system 2 can bear when the insulation performance is good, thereby further ensuring the normal operation of the high-voltage system 2.
Referring to fig. 1, in order to enable the insulation detection device 1 of the present embodiment to timely remind a worker when detecting that the insulation performance of the high voltage system 2 is not good and even a high voltage short circuit occurs, the insulation detection device 1 of the present embodiment may further include an alarm module 14. The alarm module 14 can be in communication connection with the ac power supply module 11, and is configured to send an alarm signal when the power value output by the ac power supply module 11 is greater than a preset power value, so that a detection result of poor insulation performance is timely notified to a worker. When the specific work is performed, when the output power of the alternating current power supply module 11 is greater than the preset power value, the alternating current power supply module 11 triggers the alarm module 14, the alarm module 14 sends out an alarm signal to prompt the worker of information that the insulation performance is not good, so that when the insulation detection device 1 detects the condition that the insulation performance of the high-voltage system 2 is poor or even the high-voltage short circuit occurs, the alarm module 14 can prompt the worker to disconnect a power supply loop in time, namely, the alternating current power supply module 11 is closed, and the phenomenon that the output power of the alternating current power supply module 11 is too large to damage equipment of the insulation detection device 1 is avoided. Meanwhile, equipment in the high-voltage system 2 can be maintained and replaced in time, and the like, so that the high-voltage system 2 is ensured to have good insulating performance.
The alarm module 14 may include a buzzer, and when the output power of the ac power supply module 11 is greater than the preset power value, the ac power supply module 11 triggers the buzzer to sound, so as to prompt the insulation detection result for the worker quickly. The alarm module 14 may also be an indicator light, and when the output power of the ac power supply module 11 is greater than the preset power value, the indicator light is always on.
Referring to fig. 1 and 3, in order to avoid the situation that the high-voltage system 2 has a high-voltage short circuit to damage the insulation detecting device 1, the insulation detecting device 1 of the present embodiment may further include a fuse 15, and the fuse 15 is connected in series in the power supply loop. When the ac power supply module 11 of the insulation detection apparatus 1 provides the test voltage for the primary coil 211 of the voltage transformer 21, a short circuit occurs in a circuit of a high-voltage side component of the primary coil 211 in the high-voltage system 2, so that a current in the high-voltage system 2 is very large, a load of the ac power supply module 11 is rapidly increased, the ac power supply module 11 is easily burned out, and the insulation detection apparatus 1 cannot normally operate. Therefore, the fuse 15 is serially connected to the power supply circuit between the ac power supply module 11 and the voltage transformer 21, thereby effectively avoiding the damage to the insulation detecting device 1 when the high voltage system 2 is short-circuited.
Referring to fig. 1 and 3, the insulation detecting device 1 of the present embodiment further includes a relay 16 including: a normally open contact 161 and a normally closed contact 162, wherein the normally open contact 161 is connected in series to the power supply circuit; the normally closed contact 162 is used to be connected in series to the pantograph circuit 27 of the high-voltage system 2, and the normally closed contact 162 is arranged in parallel with the normally open contact 161.
The pantograph raising loop 27 of the high-voltage system 2 is a low-voltage circuit, which is an independent circuit and is used for controlling the pantograph raising and lowering of the pantograph 22 in the high-voltage circuit. In order to ensure that the pantograph 22 is always in the pantograph lowering state when the insulation detecting device 1 detects the insulation performance of the high-voltage system 2, the power supply circuit of the insulation detecting device 1 and the pantograph raising circuit 27 can be interlocked to ensure the operation safety of the insulation detecting device 1.
Specifically, in the case where the relay 16 is connected in series to the power supply circuit of the insulation detection device 1, the normally open contact 161 of the relay 16 is connected in series to the power supply circuit, and the normally closed contact 162 of the relay is connected in series to the pantograph rising circuit 27, and when the normally open contact 161 is opened, the power supply circuit is disconnected, and the insulation detection device 1 does not operate, the normally closed contact 162 and the normally open contact 161 are in an opposite operating state, and when the normally closed contact 162 is in a closed state, the pantograph rising circuit 27 is turned on, and the pantograph 22 is controlled by the pantograph rising circuit 27 to perform pantograph rising or pantograph lowering operation. When the normally open contact 161 is closed, the power supply circuit is conducted, the insulation detection device 1 is in a working state, at this time, the working state of the normally closed contact 162 is opposite to that of the normally open contact 161, and the normally closed contact is in an open state, and the pantograph lifting circuit 27 is disconnected, and because the premise that the insulation detection device 1 starts working is that the pantograph 22 is in a pantograph lowering state, the pantograph lifting circuit 27 is disconnected, the pantograph 22 is always kept in a pantograph lowering state, misoperation of the pantograph 22 in the insulation performance detection process by an operator is avoided, and the safety of the detection device 1 in the insulation detection process is effectively improved.
The embodiment of the invention provides an insulation detection device, which is used for detecting the insulation performance of a high-voltage system of a rail train, wherein the high-voltage system comprises a voltage transformer and a high-voltage side assembly electrically connected with a primary side coil of the voltage transformer, and the insulation detection device comprises an alternating current power supply module and a detection module; the alternating current power supply module is used for being electrically connected with a secondary side coil of the voltage transformer to form a power supply loop for providing a test voltage for a primary side coil; the detection module is electrically connected with the alternating current power supply module and is used for detecting the output power of the alternating current power supply module; if the output power is larger than the preset power value, the insulation performance of the high-voltage system is poor. According to the invention, the secondary side coil of the voltage transformer of the high-voltage system is connected with the alternating current power supply module in series, then, through the induction of the primary side coil of the voltage transformer, a test voltage can be formed on the high-voltage side assembly electrically connected with the primary side coil, and whether the high-voltage side assembly has the electric leakage condition can be represented through the output power loss of the alternating current power supply module, so that the insulation performance of the high-voltage system can be determined. The insulation detection device can accurately detect the insulation condition of the high-voltage system, effectively avoids the damage of the high-voltage system electrical equipment and the pantograph net caused by the blind pantograph lifting of the high-voltage system under the condition of poor insulation, has a simple structure, is simple and convenient to judge the insulation condition, and effectively improves the working efficiency.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An insulation detection device is used for detecting the insulation performance of a high-voltage system of a rail train, wherein the high-voltage system comprises a voltage transformer and a high-voltage side assembly electrically connected with a primary side coil of the voltage transformer, and the insulation detection device is characterized by comprising an alternating current power supply module and a detection module;
the alternating current power supply module is electrically connected with a secondary side coil of the voltage transformer to form a power supply loop for providing a test voltage for the primary side coil;
the detection module is electrically connected with the alternating current power supply module and is used for detecting the output power of the alternating current power supply module;
and if the output power is greater than a preset power value, the insulation performance of the high-voltage system is poor.
2. The insulation detecting device according to claim 1, wherein the ac power supply module includes an inverter and a dc power supply, an output of the dc power supply is electrically connected to an input of the inverter, and an output of the inverter is configured to be electrically connected to an input of the secondary side coil.
3. The insulation detecting device according to claim 2, wherein the ac power supply module further comprises a transformer, an input terminal of the transformer being electrically connected to an output terminal of the inverter, an output terminal of the transformer being adapted to be electrically connected to an input terminal of the secondary side coil.
4. The insulation detecting device according to claim 2, wherein the detecting module includes a current sensor and a voltage sensor, the current sensor being connected in series between the direct-current power supply and the inverter; the voltage sensor is connected in parallel with the direct current power supply.
5. The insulation detection device according to claim 4, wherein the current sensor is an ammeter and the voltage sensor is a voltmeter.
6. The insulation detection apparatus of claim 5, wherein the voltmeter is integrated with the inverter.
7. The insulation detection device of claim 2, further comprising a controller communicatively coupled to the DC power source for controlling the DC power source to step up the output voltage.
8. The insulation detecting device according to claim 1, further comprising an alarm module, wherein the alarm module is configured to send an alarm signal when the power value output by the ac power supply module is greater than a preset power value.
9. The insulation detection apparatus as recited in claim 1, further comprising a fuse connected in series within the power supply loop.
10. The insulation detection device of claim 1, further comprising a relay, the relay comprising: the normally open contact is connected in series with the power supply circuit; the normally closed contact is used for being connected in series with a pantograph lifting loop of the high-voltage system, and the normally closed contact and the normally open contact are arranged in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811518695.7A CN111308297A (en) | 2018-12-12 | 2018-12-12 | Insulation detection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811518695.7A CN111308297A (en) | 2018-12-12 | 2018-12-12 | Insulation detection device |
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| CN111308297A true CN111308297A (en) | 2020-06-19 |
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Application publication date: 20200619 |