CN113589210A - Portable grounding test device and method for DC power supply system for plant station - Google Patents
Portable grounding test device and method for DC power supply system for plant station Download PDFInfo
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Abstract
The invention provides a portable grounding test device of a DC power supply system for a station and a test method thereof, which are suitable for a ground insulation detection test of a DC220V/110V DC power supply system of the station by setting a voltage grade selection switch and a grounding resistance value selection switch and selecting a corresponding test item of a corresponding voltage grade by using the selection switch, are convenient to operate and high in universality, and are also provided with four test resistors with different resistance values to respectively execute corresponding ground insulation alarm detection tests, thereby solving the problem that the protection device of equipment is likely to malfunction or refuse in an adjustable test resistor or a direct grounding method, ensuring that the malfunction or refuse of the protection device of the equipment cannot be caused during the test, improving the test safety and the equipment operation and maintenance level, providing powerful support for ensuring the safety and stability of a power grid, and facilitating the operation of operators.
Description
Technical Field
The invention belongs to the technical field of debugging of direct-current power supply systems, and particularly relates to a portable grounding test device and a portable grounding test method for a station direct-current power supply system.
Background
The rated voltage grade of the station DC power supply system mainly comprises two voltage grades of 220V/110V, and the alarm values of the corresponding DC bus insulation resistance to the ground are respectively different. When the direct current power supply system for the station is subjected to regular inspection, overhaul or acceptance maintenance, a simulation grounding test needs to be carried out on the direct current bus so as to ensure that the function of the direct current bus insulation monitoring device and a signal loop of the direct current bus insulation monitoring device are intact.
At present, an adjustable test resistor or a direct grounding method is generally adopted for a simulation grounding test, which may cause the malfunction or the failure of a protection device of equipment to cause a power grid safety accident. In addition, the existing checking instrument of the direct current power supply system insulation monitoring device for the station has the problems of high price, large volume and inconvenient carrying.
Therefore, the field test work needs a direct current power supply system grounding test device for a station, which is simple and rapid in operation, convenient to carry, safe and reliable, so as to test the grounding insulation monitoring function of the direct current power supply system insulation monitoring device corresponding to the voltage class, namely, the reliable alarm when the grounding insulation is smaller than the setting value, and the reliable non-alarm when the grounding insulation is larger than the setting value, but no portable direct current power supply system grounding test device for stations suitable for different voltage classes exists at present.
Disclosure of Invention
In view of the above, the present invention is directed to solve the problem that the simulation ground test performed by the existing method may cause malfunction or failure of the protection device of the device, which in turn causes a power grid safety accident.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a portable grounding test device for a station dc power supply system, comprising:
the circuit comprises a voltage grade selection switch, a grounding resistance value selection switch, a first resistor, a second resistor, a third resistor and a fourth resistor;
the grounding resistance value selection switch is provided with a test gear of 0.95 times of direct current grounding alarm value and a test gear of 1.05 times of direct current grounding alarm value, and is also provided with 4 pairs of contact points;
when the grounding resistance value selection switch selects a test gear of 0.95 times of the direct current grounding alarm value, the first butt joint point and the third butt joint point are conducted and are respectively connected with a direct current grounding alarm value test loop circuit of a 110V direct current power supply system and a direct current grounding alarm value test loop circuit of 0.95 times of the direct current power supply system of 220V direct current power supply;
when the grounding resistance value selection switch selects a test gear of 1.05 times of the direct current grounding alarm value, the second butt joint point and the fourth butt joint point are conducted, and a direct current grounding alarm value test loop of 1.05 times of the direct current power supply system of 110V and 220V is respectively connected;
the voltage grade selection switch is provided with a 110V voltage gear and a 220V voltage gear;
when the voltage level selection switch selects a 110V voltage gear, the first pair of contact points and the second pair of contact points of the voltage level selection switch and the grounding resistance value selection switch are connected;
when the voltage level selection switch selects a 220V voltage gear, a third butt joint point and a fourth butt joint point of the voltage level selection switch and the grounding resistance value selection switch are connected;
the first resistor and the third resistor are respectively and correspondingly arranged in a test loop of 0.95 times of direct current power supply system direct current ground alarm value of 110V and 220V, and the second resistor and the fourth resistor are respectively and correspondingly arranged in a test loop of 1.05 times of direct current power supply system direct current ground alarm value of 110V and 220V.
And the test button is connected with the voltage grade selection switch and used for controlling the start and stop of the test.
Further, still include insulating casing, voltage level select switch, ground resistance value select switch, first resistance, second resistance, third resistance, fourth resistance and test button all encapsulate in insulating casing.
Furthermore, a wiring jack is arranged on the insulating shell and is used for being connected with a test wiring with an insulating sealing crocodile clip.
Further, the first resistor and the second resistor are respectively set to be 0.95 times and 1.05 times of the fixed value of the insulation alarm resistance to the ground of the 110V direct current power supply system.
Further, the third resistor and the fourth resistor are respectively set to be 0.95 times and 1.05 times of the fixed value of the insulation warning resistor of the 220V direct-current power supply system to the ground.
In a second aspect, the present invention provides a dc power supply system testing method, which is applied to the station dc power supply system portable grounding testing apparatus in the first aspect, and includes the following steps:
selecting a voltage class using a voltage class selection switch;
selecting a direct current grounding test gear by using a grounding resistance value selection switch;
pressing a test button to start an earth insulation detection test, wherein the earth insulation detection test is determined by a voltage grade and a direct current earth test gear;
pressing the test button again ends the insulation to ground test.
Further, the ground insulation detection test specifically comprises:
carrying out a fixed value ground insulation detection test on 0.95 time of alarm resistance of a 110V direct-current power supply system;
1.05 times of alarm resistance constant value of a 110V direct-current power supply system is subjected to ground insulation detection test;
carrying out a 0.95-time alarm resistance constant value ground insulation detection test on a 220V direct-current power supply system;
and (3) carrying out insulation detection test on the fixed value of the alarm resistance of the 220V direct-current power supply system by 1.05 times.
In summary, the invention provides the portable grounding test device for the station DC power supply system and the test method thereof, and the portable grounding test device for the station DC power supply system and the test method thereof are suitable for the station DC220V/110V DC power supply system ground insulation detection test by setting the voltage class selection switch and the grounding resistance value selection switch and selecting the corresponding test items of the corresponding voltage classes through the selection switches, and are convenient to operate and strong in universality. The four test resistors with different resistance values are arranged to respectively execute corresponding ground insulation detection tests, so that the problem that the protection device of the equipment is mistakenly operated or refused due to the adjustable test resistor or the direct grounding method is solved, the condition that the protection device of the equipment is mistakenly operated or refused is ensured not to occur during the test, the test safety and the equipment operation and maintenance level are improved, powerful support is provided for guaranteeing the safety and stability of a power grid, and the operation of operators is facilitated.
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, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a portable grounding test device of a dc power supply system for a plant station according to an embodiment of the present invention;
fig. 2 is an external schematic view of a portable grounding test device of a dc power supply system for a plant station according to an embodiment of the present invention.
In the drawings: 1-wiring jack, 2-test button, 3-voltage grade selection switch, 4-grounding resistance value selection switch, 5-fixing screw and 6-insulating shell.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the 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.
Referring to fig. 1 and 2, the present embodiment provides a portable grounding test device for a dc power system for a plant station, including:
a voltage level selection switch 3 (i.e., SA1), a ground resistance value selection switch 4 (i.e., SA2), a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;
the grounding resistance value selection switch is provided with a test gear of 0.95 times of direct current grounding alarm value and a test gear of 1.05 times of direct current grounding alarm value, and is also provided with 4 pairs of contact points;
when the grounding resistance value selection switch selects a test gear of 0.95 times of the direct current grounding alarm value, the first butt joint point and the third butt joint point are conducted and are respectively connected with a direct current grounding alarm value test loop circuit of a 110V direct current power supply system and a direct current grounding alarm value test loop circuit of 0.95 times of the direct current power supply system of 220V direct current power supply;
when the grounding resistance value selection switch selects a test gear of 1.05 times of the direct current grounding alarm value, the second butt joint point and the fourth butt joint point are conducted, and a direct current grounding alarm value test loop of 1.05 times of the direct current power supply system of 110V and 220V is respectively connected;
the voltage grade selection switch is provided with a 110V voltage gear and a 220V voltage gear;
when the voltage level selection switch selects a 110V voltage gear, the first pair of contact points and the second pair of contact points of the voltage level selection switch and the grounding resistance value selection switch are connected;
when the voltage level selection switch selects a 220V voltage gear, a third butt joint point and a fourth butt joint point of the voltage level selection switch and the grounding resistance value selection switch are connected;
the first resistor and the third resistor are respectively and correspondingly arranged in a test loop of 0.95 times of direct current power supply system direct current ground alarm value of 110V and 220V, and the second resistor and the fourth resistor are respectively and correspondingly arranged in a test loop of 1.05 times of direct current power supply system direct current ground alarm value of 110V and 220V.
It should be noted that, as shown in fig. 1, the specific working principle of the grounding resistance value selection switch 4 is to switch the switch to 0.95 times option, turn on the contacts 1-2 and 5-6, and respectively turn on the test circuit of the 0.95 times direct current grounding alarm value of the direct current power supply system of 110V and 220V; and switching the switch to the option of 0.95 times, conducting the contacts 2-4 and 7-8, and respectively connecting the direct current grounding alarm value test loops of the direct current power supply system of 1.05 times of 110V and 220V. When the ground insulation detection test is carried out, the grounding resistance value selection switch is switched to the grounding resistance corresponding to the fixed value of the ground insulation alarm resistance of 0.95 time or 1.05 time, and then the corresponding insulation detection test project of the direct-current power supply system can be developed.
Four resistors R1, R2, R3 and R4 are integrated and applied in a ground insulation test loop, wherein R1 and R2 respectively correspond to fixed values of 0.95 time and 1.05 time of ground insulation alarm resistance of a 110V direct-current power supply system, R3 and R4 respectively correspond to fixed values of 0.95 time and 1.05 time of ground insulation alarm resistance of a 220V direct-current power supply system, and the selection of the four resistors can effectively check the reliable alarm and reliable non-alarm functions of ground insulation of a direct-current power supply system insulation monitoring device corresponding to a voltage class, so that the device is ensured not to cause misoperation or refusal of a protection device of the device while reporting a 'direct-current insulation abnormal' abnormal signal.
The resistance values of R1, R2, R3 and R4 can be set according to the specific specification requirement of the insulation resistor of the unit direct current power supply system to the ground.
The voltage level selection switch 3 is suitable for a ground insulation detection test of a DC power supply system with two voltage levels of station DC 220V/110V. When the insulation detection test of the ground is carried out, the voltage grade selection switch is switched to a corresponding voltage gear on the device operation panel according to the voltage grade of the direct-current power supply system, and then the insulation detection test of the direct-current power supply system with the corresponding voltage grade can be carried out. When the voltage grade selection switch 3 is switched to 110V, the contact 9 is switched on; when the voltage level selection switch 3 is switched to 110V, the contact 10 is turned on.
In addition, the embodiment is also provided with a self-locking test button 2 (namely SB) connected with the voltage grade selection switch 3, the test state can be kept after the self-locking test button is pressed down, the self-locking test button is used for starting and stopping the test, and the ground insulation detection test can be completed by one key. When the test loop is in an off state, the self-locking test button 2 is pressed, the contact 11 is kept on, and the test loop is switched on; and the self-locking test button 2 is pressed, the contact 11 is disconnected, and the test loop is disconnected.
The embodiment provides a portable grounding test device for a DC power supply system for a station, which is suitable for a grounding insulation alarm detection test of a DC220V/110V DC power supply system for the station by setting a voltage level selection switch and a grounding resistance value selection switch and selecting a corresponding test item of a corresponding voltage level through the selection switch, and has the advantages of convenient operation and strong universality. The four test resistors with different resistance values are arranged to respectively execute corresponding ground insulation detection tests, so that the problem that the protection device of the equipment is mistakenly operated or refused due to the adjustable test resistor or the direct grounding method is solved, the condition that the protection device of the equipment is mistakenly operated or refused is ensured not to occur during the test, the test safety and the equipment operation and maintenance level are improved, powerful support is provided for guaranteeing the safety and stability of a power grid, and the operation of operators is facilitated.
The above is a detailed description of one embodiment of the portable grounding test device for a dc power supply system for a plant station according to the present invention, and the following is a detailed description of another embodiment of the portable grounding test device for a dc power supply system for a plant station according to the present invention.
Referring to fig. 2, the portable grounding test device for a dc power system of a station in this embodiment includes a connection jack 1, a test button 2, a voltage class selection switch 3, a grounding resistance selection switch 4, a fixing screw 5, and an insulating housing 6, and four test resistors R1, R2, R3, and R4 with different resistances are further encapsulated in the insulating housing 6 of the device.
The specific configurations of the test button 2, the voltage level selection switch 3, the grounding resistance selection switch 4, and the four test resistors R1, R2, R3, and R4 with different resistances are the same as those in the previous embodiment, and are not described herein again.
In the embodiment, the device shell adopts the insulating shell 6 to integrally encapsulate each part, thereby avoiding the risks of short circuit, personal electric shock and the like in the test process, having simple appearance, small volume, light weight, convenient carrying and easy storage, and being placed in a tool kit/bag or an instrument box.
It will be understood that the parts of the switches and buttons enclosed in the insulating casing are mainly the parts connected to the test circuit, and the parts corresponding to the switches and buttons are provided on the insulating casing for the operator to operate.
Be equipped with wiring jack 1 on insulating casing 6, used experimental wiring plug need insert wiring jack 1 during the experiment, for effectively taking precautions against the electrified position of experimenter contact, the crocodile that insulating package was taken in experimental wiring adoption presss from both sides, can ensure experimental operation safe and reliable.
During specific implementation, crocodile clips of test wiring can be connected to a direct current bus and a grounding copper bar respectively, a voltage grade selection switch 3 is selected to a corresponding voltage gear according to voltage grade, then grounding resistance corresponding to a fixed value of 0.95 time or 1.05 time of ground insulation alarm resistance is selected, finally, a self-locking test button 2 is pressed to connect a test loop, a ground insulation detection test is started, the test loop can be disconnected by pressing the test button 2 again after the test is finished, and the overall test operation is simple and rapid.
The embodiment provides a portable grounding test device for a DC power supply system for a station, which adopts an integrated design and is formed by packaging components such as an insulating shell, a wiring jack, a test button, a voltage class selection switch, a grounding resistance value selection switch, four test resistors with different resistance values and the like, and has the advantages of concise appearance, small volume, light weight, convenience in carrying and easiness in storage; the electrified part is packaged in the insulating box, so that the contact of a tester with the electrified part can be effectively prevented, and the safety and reliability of test operation are ensured.
The above is a detailed description of an embodiment of the portable grounding test device for a dc power system for a plant station according to the present invention, and the following is a detailed description of an embodiment of a testing method for a dc power system according to the present invention.
The embodiment provides a dc power supply system testing method, which is applied to the station-used dc power supply system portable grounding testing apparatus according to the foregoing embodiment, and includes the following steps:
selecting a voltage class using a voltage class selection switch;
selecting a direct current grounding test gear by using a grounding resistance value selection switch;
pressing a test button to start an earth insulation detection test, wherein the earth insulation detection test is determined by a voltage grade and a direct current earth test gear;
pressing the test button again ends the insulation to ground test.
It should be noted that the ground insulation detection test specifically includes: firstly, a fixed value ground insulation detection test of 0.95 times of alarm resistance of a 110V direct-current power supply system is carried out; testing the insulation detection of the 1.05 times of alarm resistance constant value to the ground of the 110V direct-current power supply system; thirdly, conducting a 0.95-time alarm resistance constant value ground insulation detection test on a 220V direct-current power supply system; and fourthly, carrying out insulation detection test on the fixed value of the alarm resistance of the 220V direct-current power supply system by 1.05 times.
The following detailed descriptions of the 4 ground insulation detection tests are provided in combination with the portable grounding test device for the dc power supply system for the plant station:
1) insulation detection test of 0.95-time alarm resistance constant value to ground for 110V direct-current power supply system
Selecting a voltage class selection switch 3 to 110V, selecting a grounding resistance value selection switch 4 to 0.95 time of grounding resistance with a fixed value of the ground insulation alarm resistance, and finally pressing a self-locking test button 2 to connect a test loop, wherein the R1 resistance loop is connected at the moment, so that the reliable ground insulation alarm function of the insulation monitoring device of the direct-current power supply system can be tested; after the test is finished, the test button 2 is pressed again to disconnect the test loop and finish the test.
2) 1.05-time alarm resistance constant value ground insulation detection test for 110V direct-current power supply system
Selecting a voltage class selection switch 3 to 110V, selecting a grounding resistance value selection switch 4 to a grounding resistance which is 1.05 times of the fixed value of the ground insulation alarm resistance, finally pressing a self-locking test button 2 to connect a test loop, wherein the R2 resistance loop is connected at the moment, so that the reliable ground insulation non-alarm function of the insulation monitoring device of the direct-current power supply system can be tested; after the test is finished, the test button 2 is pressed again to disconnect the test loop and finish the test.
3) 0.95-time alarm resistance constant value ground insulation detection test for 220V direct-current power supply system
Selecting a voltage class selection switch 3 to 220V, selecting a grounding resistance value selection switch 4 to 0.95 time of grounding resistance with a fixed value of the ground insulation alarm resistance, and finally pressing a self-locking test button 2 to connect a test loop, wherein the R3 resistance loop is connected at the moment, so that the reliable ground insulation alarm function of the insulation monitoring device of the direct-current power supply system can be tested; after the test is finished, the test button 2 is pressed again to disconnect the test loop and finish the test.
4) Fixed-value ground insulation detection test of 1.05-time alarm resistance of 220V direct-current power supply system
Selecting a voltage class selection switch 3 to 220V, selecting a grounding resistance value selection switch 4 to 1.05 times of grounding resistance with a fixed value of the ground insulation alarm resistance, and finally pressing a self-locking test button 2 to connect a test loop, wherein the R4 resistance loop is connected at the moment, so that the reliable ground insulation non-alarm function of the insulation monitoring device of the direct-current power supply system can be tested; after the test is finished, the test button 2 is pressed again to disconnect the test loop and finish the test.
The embodiment provides a test method of a direct current power supply system, which can complete a detection test of insulation to ground of a station DC220V/110V direct current power supply system by using a portable grounding test device of the station direct current power supply system, and has the advantages of convenient operation and strong universality.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. Portable grounding test device of DC power supply system for station, its characterized in that includes:
the circuit comprises a voltage grade selection switch, a grounding resistance value selection switch, a first resistor, a second resistor, a third resistor and a fourth resistor;
the grounding resistance value selection switch is provided with a test gear of 0.95 times of direct current grounding alarm value and a test gear of 1.05 times of direct current grounding alarm value, and is also provided with 4 pairs of contact points;
when the grounding resistance value selection switch selects a test gear of 0.95 times of direct current grounding alarm value, the first butt joint point and the third butt joint point are conducted and are respectively connected with a direct current grounding alarm value test loop of a 110V direct current power supply system and a direct current grounding alarm value test loop of 0.95 times of direct current power supply system of 220V direct current power supply;
when the grounding resistance value selection switch selects a test gear of 1.05 times of the direct current grounding alarm value, the second butt joint point and the fourth butt joint point are conducted, and a direct current grounding alarm value test loop of 1.05 times of the direct current power supply system of 110V and 220V is respectively connected;
the voltage grade selection switch is provided with a voltage gear of 110V and a voltage gear of 220V;
when the voltage level selection switch selects a 110V voltage gear, the voltage level selection switch is connected with a first pair of contact points and a second pair of contact points of the grounding resistance value selection switch;
when the voltage level selection switch selects a 220V voltage gear, a third butt joint point and a fourth butt joint point of the voltage level selection switch and the grounding resistance value selection switch are connected;
the first resistor and the third resistor are respectively and correspondingly arranged in a test loop circuit of 0.95 times of direct current power supply system direct current grounding alarm value of 110V and 220V, and the second resistor and the fourth resistor are respectively and correspondingly arranged in a test loop circuit of 1.05 times of direct current power supply system direct current grounding alarm value of 110V and 220V.
2. The portable grounding test device for the DC power supply system of the plant station according to claim 1, further comprising a test button connected to the voltage level selection switch for controlling the start and stop of the test.
3. The portable grounding test device for the DC power supply system of the plant station according to claim 2, further comprising an insulating housing, wherein the voltage level selection switch, the grounding resistance selection switch, the first resistor, the second resistor, the third resistor, the fourth resistor and the test button are all packaged in the insulating housing.
4. The portable grounding test device for the DC power supply system of the plant station as claimed in claim 3, wherein the insulation housing is provided with a wiring jack for connecting with a test wiring with an insulation sealing crocodile clip.
5. The portable grounding test device for the DC power supply system for the plant station according to claim 1, wherein the first resistor and the second resistor are respectively set to be a fixed value of the insulation warning resistance to the ground of the 110V DC power supply system of 0.95 times and 1.05 times.
6. The portable grounding test device for the DC power supply system for the plant station according to claim 1, wherein the third resistor and the fourth resistor are respectively set to be 0.95 times and 1.05 times of the fixed value of the insulation warning resistor of the 220V DC power supply system to the ground.
7. A DC power supply system test method applied to the portable grounding test device of the DC power supply system for the plant station according to any one of claims 1 to 6 is characterized by comprising the following steps:
selecting a voltage class using a voltage class selection switch;
selecting a direct current grounding test gear by using a grounding resistance value selection switch;
pressing a test button to start an insulation against ground test, wherein the insulation against ground test is determined by the voltage level and the direct-current grounding test gear;
and pressing the test button again to finish the ground insulation detection test.
8. The direct-current power supply system test method according to claim 7, wherein the ground insulation detection test specifically comprises:
carrying out a fixed value ground insulation detection test on 0.95 time of alarm resistance of a 110V direct-current power supply system;
1.05 times of alarm resistance constant value of a 110V direct-current power supply system is subjected to ground insulation detection test;
carrying out a 0.95-time alarm resistance constant value ground insulation detection test on a 220V direct-current power supply system;
and (3) carrying out insulation detection test on the fixed value of the alarm resistance of the 220V direct-current power supply system by 1.05 times.
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