CN108548983B - Method, device and system for testing capacitance current - Google Patents
Method, device and system for testing capacitance current Download PDFInfo
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- CN108548983B CN108548983B CN201810210204.6A CN201810210204A CN108548983B CN 108548983 B CN108548983 B CN 108548983B CN 201810210204 A CN201810210204 A CN 201810210204A CN 108548983 B CN108548983 B CN 108548983B
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The invention provides a method, a device and a system for testing capacitance current, wherein the method comprises the following steps: respectively electrically connecting a test terminal of a current output module of the capacitance current test device with a phase a end, a phase b end and a phase c end of a switch cabinet electrified indicating device, electrically connecting a grounding terminal o with a grounding terminal of the switch cabinet electrified indicating device, and electrically connecting a current transformer of each phase between a corresponding electrified indicating sensor capacitor and a switch cabinet electrified display device capacitor; outputting a pilot frequency current signal; acquiring pilot frequency voltage and pilot frequency current corresponding to each pilot frequency current signal; calculating the capacitance to ground of each phase of the neutral point ungrounded system; and calculating to obtain the capacitance-to-ground current according to the capacitance-to-ground of each phase. The method has the advantages of simple test loop, capability of respectively calculating the capacitance of each phase of the power system to ground, no need of power failure, high safety and the like, and is suitable for testing the capacitance and current of the ungrounded system.
Description
Technical Field
The present disclosure relates to the field of power systems, and in particular, to a method, an apparatus, and a system for testing a capacitive current.
Background
The neutral point is not grounded, and the current flowing through the fault point when the line is grounded in a single phase is the capacitance current generated by the line to ground capacitance. The most faults of the neutral point ungrounded system are caused by that the electric arc is not easy to self-extinguish because the capacitance current is too large when the line is grounded in a single phase. The power system of our country stipulates that when the capacitance current of 10kV and 35kV systems is larger than 30A and 10A, the arc suppression coil should be installed to compensate the capacitance current, and in order to determine the compensation capacity of the arc suppression coil, a capacitance current test should be carried out. In addition, in order to verify whether ferromagnetic resonance occurs between the electromagnetic voltage transformer PT of the non-effective grounding system and the stray capacitance of the line, the capacitance current of the system must be measured.
Common capacitance and current testing methods include a direct measurement method and an indirect measurement method, wherein the direct measurement method is used for directly measuring a phase line in a single-phase connection manner; the indirect measurement method mainly includes an offset capacitance method, a neutral point plus capacitance method, a pilot frequency method and the like. However, the capacitance current is measured by a direct method, and the capacitance current is directly contacted with high voltage during testing, so that the power grid and life safety risks are high. The existing indirect measurement method, such as a neutral point plus capacitance method, has the defects that partial systems have no neutral points or the offset voltage of the neutral points is small, and the safety risk occurs when a single-phase earth fault occurs in the measurement process; the different-frequency method is usually used for measuring an opening triangular winding of an electromagnetic voltage transformer, a harmonic eliminator needs to be removed or short-circuited during measurement, the electromagnetic voltage transformer needs to be powered off, the test work becomes complicated, and even ferromagnetic resonance risks are brought to a system. Therefore, it is necessary to find a safe and simple test for the capacitance current test.
Disclosure of Invention
The embodiment of the invention provides a method, a device and a system for testing capacitance current, and aims to solve the problems of complex operation and poor safety in the prior art.
The invention provides a testing device of capacitance current, which comprises a power supply module, a high-frequency power supply module, a current output module, a testing module, a capacitance current calculating module and a current transformer, wherein one end of the high-frequency power supply module is electrically connected with the power supply module, the other end of the high-frequency power supply module is electrically connected with the current output module and the testing module respectively, and the testing module is also electrically connected with the capacitance current calculating module and the current transformer of each phase respectively.
Preferably, the current output module includes a test terminal m and a ground terminal o, the test terminal m is electrically connected to the phase a end, the phase b end and the phase c end of the switch cabinet live indicating device, respectively, and the ground terminal o is electrically connected to the ground terminal of the switch cabinet live indicating device.
Preferably, the device further comprises a display module, and the display module is electrically connected with the other end of the capacitance and current calculation module.
The invention also provides a system for testing capacitance current, which comprises the deviceThe device also comprises a three-phase power supply, an electrified indicating sensor and a switch cabinet electrified indicating device, wherein the phase a end, the phase b end and the phase c end of the switch cabinet electrified indicating device are respectively connected with the phase A source E in the three-phase power supply through the electrified indicating sensor1B phase source E2And C phase source E3And during testing, a testing terminal m of the current output module is electrically connected with the phase a end, the phase b end and the phase c end of the switch cabinet electrified indicating device respectively, a grounding terminal o of the current output module is electrically connected with the grounding terminal of the switch cabinet electrified indicating device, and a current transformer of each phase is electrically connected between the corresponding electrified indicating sensor capacitor and the switch cabinet electrified display device capacitor.
The invention also provides a method for testing the capacitance current, which comprises the following steps:
respectively electrically connecting a test terminal m of a current output module of the capacitance current test device with a phase a end, a phase b end and a phase c end of a switch cabinet electrified indicating device, electrically connecting a grounding terminal o of the current output module of the capacitance current test device with a grounding terminal of the switch cabinet electrified indicating device, and electrically connecting a current transformer of each phase between a corresponding electrified indicating sensor capacitor and a switch cabinet electrified display device capacitor;
controlling a high-frequency voltage module of the capacitance current testing device to output a preset pilot frequency current signal;
the test module obtains the pilot frequency current i of the current output module0Each corresponding lower pilot frequency voltage ua、ub、ucAnd each corresponding pilot frequency current ia、ib、ic；
According to a different frequency current iaB different frequency current ibC different frequency current icA different frequency voltage uaB different frequency voltage ubC-phase difference frequency voltage ucThe capacitance of the charged indication sensor is calculated to obtain the ground capacitance of each phase of the neutral point ungrounded system;
and calculating to obtain the earth capacitance current according to the earth capacitance of each phase.
Preferably, the pilot frequency current signalA certain current value i between 0.1mA and 100mA0The frequency of the different-frequency current signal is a certain frequency value between 0.2k and 1000 kHz.
Preferably, the calculation formula of the capacitance to ground of each phase is:
wherein, Ca、Cb、CcA is a relative ground capacitor, B is a relative ground capacitor and C is a relative ground capacitor in the neutral point ungrounded system respectively; c11、C12、C13A-phase capacitance, B-phase capacitance and C-phase capacitance corresponding to the switch cabinet electrified indicating sensor respectively; omega1Is the angular frequency of the input pilot frequency current signal.
Preferably, the calculation formula of the capacitance-to-ground current is as follows:
wherein, C21、C22、C23Respectively corresponding to the charged indicating device, namely, the A-phase capacitor, the B-phase capacitor and the C-phase capacitor, omega2Is the angular frequency of the system to be measured;
for the system phase voltage to be measured, IcIs a capacitive current to ground.
The beneficial effect of this application is as follows:
the invention provides a capacitance current testing method, a device and a system, wherein the device comprises a power supply module, a high-frequency power supply module, a current output module, a testing module, a capacitance current calculating module and a current transformer, one end of the high-frequency power supply module is electrically connected with the power supply module, the other end of the high-frequency power supply module is electrically connected with the current output module and the testing module respectively, and the testing module is also electrically connected with the capacitance current calculating module and the current transformer of each phase respectively. The power supply module is used for supplying power to other modules of the device; height ofThe frequency power supply module is used for generating a pilot frequency current signal; the current output module is used for outputting a pilot frequency current signal to a voltage division capacitor of the electrified indicating device; the measuring module is used for testing the voltage of the current output module and the total current of the loop; the capacitance current calculation module is used for calculating capacitance current according to a preset formula, and the current transformer is used for testing the pilot frequency current of each phase. The invention skillfully utilizes the capacitance (C) of the commonly used switch cabinet electrified indicating sensor11、C12、C13) And a capacitance (C) of the charge indicating device21、C22、C23) Measuring the capacitance (C) of the charge indicating device by applying a pilot frequency current signal21、C22、C23) The voltage and the pilot frequency current of the electrified indicating sensor of the switch cabinet are used for obtaining the capacitance current of the tested system to the ground, the method has the advantages of simple test loop, capability of respectively calculating the capacitance of each phase of the power system to the ground, no power failure, high safety and the like, and is suitable for testing the capacitance current of the ungrounded system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
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 for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is an electrical wiring diagram of a capacitance current testing system based on a switch cabinet live indicating device according to an embodiment of the present application;
fig. 2 is an electrical equivalent circuit diagram for measuring a relative ground capacitance according to an embodiment of the present disclosure;
fig. 3 is an electrical equivalent circuit diagram for B-phase to ground capacitance measurement according to an embodiment of the present disclosure;
fig. 4 is an electrical equivalent circuit diagram for measuring capacitance to ground of a phase C provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a capacitance current testing apparatus according to an embodiment of the present disclosure;
fig. 6 is a flowchart of a method for testing a capacitance current according to an embodiment of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present 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.
Referring to fig. 1-4, an electrical wiring diagram, an a-to-ground capacitance measurement electrical equivalent circuit diagram, a B-to-ground capacitance measurement electrical equivalent circuit diagram, and a C-to-ground capacitance measurement electrical equivalent circuit diagram of a capacitance current testing system based on a switch cabinet live indication device according to an embodiment of the present application are shown. As can be seen from fig. 1 to 4, the test system includes a neutral point ungrounded system and a corresponding capacitive current test apparatus, and the neutral point ungrounded system is a system under test of the capacitive current test apparatus. Three-phase power supply of system under test (A phase source E)1B phase source E2And C phase source E3) The upper parts of the switch cabinet are respectively and electrically connected with an electrified indicating sensor which is electrically connected with an electrified indicating device of the switch cabinet. The switch cabinet electrification indicating device is usually used for monitoring whether a switch cabinet is electrified or not, and if the switch cabinet is electrified, a warning signal is sent or a switch cabinet door is electrically locked so as to prompt workers that the switch cabinet is electrified and the cabinet door cannot be opened.
The charged indication sensors respectively comprise A-phase capacitors C corresponding to the charged indication sensors11Phase B capacitor C12And C phase capacitance C13The switch cabinet electrification indicating device comprises A-phase capacitors C corresponding to the A-phase capacitors C respectively21Phase B capacitor C22And C phase capacitance C23Capacitor C11And a capacitor C21Electric connection, capacitor C12And a capacitor C22Electric connection, capacitor C13And a capacitor C23And (6) electrically connecting. Capacitor C21Capacitor C22And a capacitor C23And C11、C12、C13The voltage on the electrified indicator lamp is ensured by matching with voltage division.
The application provides a capacitive current testing arrangement includes test terminal m and ground terminal o, test terminal m is connected with cubical switchboard electrified indicating device's a looks end, b looks end and c looks end electricity respectively, ground terminal o is connected with cubical switchboard electrified indicating device's earthing terminal electricity, and test terminal m is used for injecting the test of pilot frequency current signal and three phase current to the system.
Fig. 5 is a schematic structural diagram of a capacitance current testing apparatus according to an embodiment of the present disclosure. As can be seen from fig. 5, the capacitance current testing apparatus includes a power module 1, a high-frequency power module 2, a current output module 3, a testing module 4, a capacitance current calculating module 5 and a current transformer 6, wherein one end of the high-frequency power module 2 is electrically connected to the power module 1, the other end of the high-frequency power module is electrically connected to the current output module 3 and the testing module 4, and the testing module 4 is further electrically connected to the capacitance current calculating module 5 and the current transformer 6 of each phase. The power module 1 is a power supply module for supplying power to other modules of the device, and the power module 1 can be an element with a power supply function, such as a storage battery; the high-frequency power supply module 2 is used for generating pilot frequency current signals, such as a frequency converter and the like; the current output module 3 is used for outputting a pilot frequency current signal to a voltage division capacitor of the electrification indicating device, the current output module 3 comprises a test terminal m and a grounding terminal o, and the test terminal m and the grounding terminal o are used for respectively injecting the pilot frequency current signal with a certain frequency between 0.2k and 1000kHz into the voltage division capacitors (C) of the A-phase electrification indicating device, the B-phase electrification indicating device and the C-phase electrification indicating device21、C22、C23) (ii) a The measuring module 4 is used for testing the voltage, the loop total current and each different frequency current of the current output module 3, namely the different frequency current i0Each corresponding lower pilot frequency voltage ua、ub、ucAnd each corresponding pilot frequency current ia、ib、icMeasuring module4 can be a tester with voltage and current detection functions; the capacitance current calculation module 5 is used for calculating capacitance current according to a preset program and a formula, the capacitance current calculation module 5 can be a microprocessor such as an MCU (microprogrammed control Unit) with a calculation processing function, and the current transformer 6 is used for testing the pilot frequency current of each phase.
In addition, in other embodiments of the present application, the capacitance current testing apparatus may further include a display module 7, where the display module 7 is electrically connected to the other end of the capacitance current calculating module 5, and is configured to display the capacitance current value calculated by the capacitance current calculating module 5, and in this embodiment, the display module 7 may be a display having a display function.
Based on the capacitance current testing device, the application also provides a capacitance current testing method. Referring to fig. 6, a flowchart of a method for testing a capacitance current according to an embodiment of the present application is shown. As can be seen from fig. 6, this comprises the following steps:
step S100: the method comprises the steps of electrically connecting a test terminal m of a current output module of the capacitance current test device with an a-phase end, a b-phase end and a c-phase end of a switch cabinet electrified indicating device respectively, electrically connecting a grounding terminal o of the current output module of the capacitance current test device with a grounding terminal of the switch cabinet electrified indicating device, and electrically connecting a current transformer of each phase between a corresponding electrified indicating sensor capacitor and a switch cabinet electrified display device capacitor.
Step S200: high-frequency voltage module for controlling capacitance current testing device to output preset pilot frequency current signal i0The pilot frequency current signal is a certain current value i between 0.1mA and 100mA0The frequency of the different-frequency current signal is a certain frequency value between 0.2k and 1000 kHz.
Step S300: the test module obtains the different-frequency current signal under the different-frequency current i0Each corresponding lower pilot frequency voltage ua、ub、ucAnd each corresponding pilot frequency current ia、ib、ic. Wherein u isaIs a corresponding pilot frequency voltage ubB is the corresponding pilot frequency voltage ucIs c corresponding pilot frequency voltage；iaIs a corresponding pilot frequency current, ibB is the corresponding pilot frequency current, icC is the corresponding pilot frequency current.
Step S400: according to a different frequency current iaB different frequency current ibC different frequency current icA different frequency voltage uaB different frequency voltage ubC-phase difference frequency voltage ucAnd the capacitance of the charged indication sensor is calculated to obtain the ground capacitance of each phase of the neutral point ungrounded system, and the specific calculation formula is as follows:
wherein, Ca、Cb、CcA is a relative ground capacitor, B is a relative ground capacitor and C is a relative ground capacitor in the neutral point ungrounded system respectively; c11、C12、C13A-phase capacitance, B-phase capacitance and C-phase capacitance corresponding to the switch cabinet electrified indicating sensor respectively; omega1Is the angular frequency of the input pilot frequency current signal. In the above formula 1, C11、C12、C13And ω1All are known quantities, therefore, according to the electric equivalent circuit diagrams provided by figures 2-4, a calculation formula 1 can be obtained, and the capacitance to ground C of each phase of the neutral point ungrounded system can be calculated and obtained through the formula 1a、Cb、Cc。
Step S500: according to the ground capacitance of each phase, calculating to obtain the current I of the ground capacitancecThe specific calculation formula is as follows:
wherein, ω is2Is the angular frequency of the system to be measured, typically a constant value, 50 Hz;
for the system phase voltage to be measured, IcIs a capacitive current to ground.
The capacitance current testing device and the testing method based on the capacitance current testing device have the advantages of simple testing loop, capability of respectively calculating the capacitance of each phase of the power system to ground, no need of power failure, high safety and the like, and are suitable for testing the capacitance current of the ungrounded system.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is merely a detailed description of the invention, and it should be noted that modifications and adaptations by those skilled in the art may be made without departing from the principles of the invention, and should be considered as within the scope of the invention.
Claims (7)
1. The device for testing the capacitance current is characterized by comprising a power supply module (1), a high-frequency power supply module (2), a current output module (3), a testing module (4), a capacitance current calculating module (5) and a current transformer (6), wherein one end of the high-frequency power supply module (2) is electrically connected with the power supply module (1), the other end of the high-frequency power supply module is electrically connected with the current output module (3) and the testing module (4) respectively, and the testing module (4) is also electrically connected with the capacitance current calculating module (5) and the current transformer (6) of each phase respectively; wherein:
the power supply module (1) is used for supplying power to the high-frequency power supply module (2), the current output module (3), the test module (4) and the capacitance current calculation module (5);
the high-frequency power supply module (2) is used for generating a pilot frequency current signal;
the current output module (3) comprises a test terminal m and a grounding terminal o, the test terminal m is respectively and electrically connected with the phase a end, the phase b end and the phase c end of the switch cabinet electrification indicating device, and the grounding terminal o is electrically connected with the grounding end of the switch cabinet electrification indicating device;
the test module (4) is used for testing each corresponding pilot frequency voltage and each corresponding pilot frequency current under the pilot frequency current;
and the capacitance current calculating module (5) is used for calculating capacitance current according to a preset program and a formula.
2. The device according to claim 1, characterized in that it further comprises a display module (7), said display module (7) being electrically connected to the other end of said capacitive current calculation module (5).
3. A capacitive current testing system, comprising the device as claimed in any one of claims 1-2, further comprising a three-phase power supply, a charge indication sensor and a switch cabinet charge indication device, wherein the a-phase terminal, the b-phase terminal and the c-phase terminal of the switch cabinet charge indication device are respectively connected with the a-phase source E of the three-phase power supply through the charge indication sensor1B phase source E2And C phase source E3And during testing, a testing terminal m of the current output module (3) is respectively electrically connected with the phase a end, the phase b end and the phase c end of the switch cabinet electrified indicating device, a grounding terminal o of the current output module (3) is electrically connected with the grounding terminal of the switch cabinet electrified indicating device, and a current transformer (6) of each phase is electrically connected between the corresponding electrified indicating sensor capacitor and the switch cabinet electrified display device capacitor.
4. A method for testing capacitance current is characterized by comprising the following steps:
respectively electrically connecting a test terminal m of a current output module of the capacitance current test device with a phase a end, a phase b end and a phase c end of a switch cabinet electrified indicating device, electrically connecting a grounding terminal o of the current output module of the capacitance current test device with a grounding terminal of the switch cabinet electrified indicating device, and electrically connecting a current transformer of each phase between a corresponding electrified indicating sensor capacitor and a switch cabinet electrified display device capacitor;
controlling a high-frequency voltage module of the capacitance current testing device to output a preset pilot frequency current signal;
the test module obtains the pilot frequency current i of the electrified display device of the switch cabinet0Each corresponding lower pilot frequency voltage ua、ub、ucAnd each corresponding pilot frequency current ia、ib、ic；
According to a different frequency current iaB different frequency current ibC different frequency current icA different frequency voltage uaB different frequency voltage ubC-phase difference frequency voltage ucThe capacitance of the charged indication sensor is calculated to obtain the ground capacitance of each phase of the neutral point ungrounded system;
and calculating to obtain the earth capacitance current according to the earth capacitance of each phase.
5. The method according to claim 4, wherein the pilot frequency current signal is a current value i between 0.1mA and 100mA0The frequency of the different-frequency current signal is a certain frequency value between 0.2k and 1000 kHz.
6. The method of claim 4, wherein the capacitance to ground for each phase is calculated by:
wherein, Ca、Cb、CcRespectively, A is relative to ground capacitance, B is relative to ground capacitance andc is capacitance to ground; c11、C12、C13A-phase capacitance, B-phase capacitance and C-phase capacitance corresponding to the switch cabinet electrified indicating sensor respectively; omega1Is the angular frequency of the input pilot frequency current signal.
7. The method of claim 6, wherein the capacitance-to-ground current is calculated by:
wherein, C21、C22、C23Respectively corresponding to the charged indicating device, namely, the A-phase capacitor, the B-phase capacitor and the C-phase capacitor, omega2Is the angular frequency of the system to be measured;
for the system phase voltage to be measured, IcIs a capacitive current to ground.
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| CN109901019B (en) * | 2019-04-02 | 2020-07-03 | 云南电网有限责任公司电力科学研究院 | Method and device for measuring capacitance current of resonant grounding system |
| CN109782055B (en) * | 2019-04-02 | 2020-06-30 | 云南电网有限责任公司电力科学研究院 | Method and device for measuring capacitance current of ungrounded neutral system |
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| CN205910263U (en) * | 2016-06-27 | 2017-01-25 | 国网河南省电力公司新乡供电公司 | Earth -free distribution network capacitance current measurement system of neutral point |
| CN206020509U (en) * | 2016-08-31 | 2017-03-15 | 淮北工科检测检验有限公司 | A kind of capacitance current tacheometer |
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