CN108548982B - Method, device and system for testing capacitance current - Google Patents
Method, device and system for testing capacitance current Download PDFInfo
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- CN108548982B CN108548982B CN201810209567.8A CN201810209567A CN108548982B CN 108548982 B CN108548982 B CN 108548982B CN 201810209567 A CN201810209567 A CN 201810209567A CN 108548982 B CN108548982 B CN 108548982B
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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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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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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 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 the switch cabinet electrified indicating device, and 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; controlling a high-frequency voltage module of the capacitance current testing device to output a pilot frequency current signal; the test module acquires the pilot frequency voltage of the current output module under the pilot frequency current; calculating to obtain the total ground capacitance of the neutral point ungrounded system according to the pilot frequency current signal and the pilot frequency voltage under the pilot frequency current; and calculating to obtain the earth capacitance current according to the total earth capacitance. 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 and a capacitance current calculating module, 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 other end of the testing module is electrically connected with the capacitance current calculating module.
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, 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 the capacitance current, which comprises any of the aboveThe device further 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, the 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, and the grounding terminal o of the current output module is electrically connected with the grounding terminal of the switch cabinet electrified indicating device.
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 the switch cabinet electrified indicating device, and 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;
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 module0Lower pilot frequency voltage uo；
Respectively and electrically connecting a test terminal m of a current output module of the capacitance current test device with a phase b end and a phase c end of the electrified indicating device of the switch cabinet, and respectively acquiring the pilot frequency current signal at the pilot frequency current u by the test moduleoPhase b current ibAnd c-phase current ic；
According to the pilot frequency current signal i0And the pilot frequency current i0Lower pilot frequency voltage uoAnd calculating to obtain the total earth capacitance C of the neutral point ungrounded system0；
According to the total capacitance to ground C0Calculating to obtain the capacitance current I to groundc。
Preferably, the 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.
Preferably, the total capacitance to ground C0The calculation formula of (2) is as follows:
wherein, C11A-phase capacitance and C corresponding to electrified indication sensor of switch cabinet21The A-phase capacitance omega corresponding to the charged indicating device1Is the angular frequency of the input pilot frequency current signal.
Preferably, the capacitance-to-ground current IcThe calculation formula of (2) is as follows:
wherein, ω is2Is the angular frequency of the system to be measured;
is the system phase voltage under test.
The beneficial effect of this application is as follows:
the invention provides a method, a device and a system for testing capacitance current, wherein the device comprises a power supply module, a high-frequency power supply module, a current output module, a testing module and a capacitance current calculating module, 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 respectively electrically connected with the current output module and the testing module, and the other end of the testing module is electrically connected with the capacitance current calculating module. The power supply module is used for supplying power to other modules of the device; the high-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. 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) Measurement is not groundedThe capacitance current of the system 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 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 system for testing capacitive current provided by an embodiment of the present application;
fig. 2 is an electrical equivalent circuit diagram for measuring capacitance to ground of a system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a capacitance current testing apparatus according to an embodiment of the present disclosure;
fig. 4 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 and 2, there are shown an electrical wiring diagram of a system for testing a capacitive current according to an embodiment of the present application and a system for testing a capacitive current according to an embodiment of the present application with respect to groundAn electrical equivalent circuit diagram is measured. As can be seen from fig. 1 and 2, 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 (A phase source E) of system under test1B 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 electricity connection cubical switchboard electrified indicating device's an looks end, b looks end and c looks end, ground terminal o electricity connection cubical switchboard electrified indicating device's earthing terminal, test terminal m are used for injecting the test of pilot frequency current signal and three phase current to the system.
Referring to fig. 3, a schematic structural diagram of a capacitance current testing apparatus according to an embodiment of the present disclosure is shown. As shown in fig. 3, the capacitive current testing device comprises a power module 1, a high-frequency power module 2, a current output module 3, a testing module 4 and a capacitive current calculating module 5, wherein one end of the high-frequency power module 2 is electrically connected with the power module 1, the other end of the high-frequency power module is electrically connected with the current output module 3 and the testing module 4 respectively, and the testing moduleThe other end of the block 4 is electrically connected with a capacitance current calculation module 5. 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 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, B-phase and C-phase electrification indicating devices21、C22、C23) (ii) a The measuring module 4 is used for testing the voltage of the current output module 3 and the total loop current, and the measuring module 4 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, and the capacitance current calculation module 5 can be a microprocessor such as an MCU having a calculation processing function.
In addition, in other embodiments of the present application, the capacitance current testing apparatus may further include a display module 6, where the display module 6 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 6 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. 4, 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. 4, this comprises the following steps:
step S100: and respectively electrically connecting a test terminal m of the current output module of the capacitance current test device with an a-phase end, a b-phase end and a c-phase end of the switch cabinet electrified indicating device, and 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.
Step S200: a high-frequency voltage module of the control capacitance current testing device outputs a preset pilot frequency current signal, wherein the pilot frequency current signal is a certain current value i between 0.1mA and 100mA0Said pilot frequencyThe frequency of the current signal is a certain frequency value between 0.2k and 1000 kHz.
Step S300: the test module obtains the pilot frequency current i of the current output module0Lower pilot frequency voltage uo。
Step S400: according to the pilot frequency current i0And the pilot frequency current i0Lower pilot frequency voltage uoAnd calculating to obtain the total earth capacitance C of the neutral point ungrounded system0The specific calculation formula is as follows:
wherein, C11A-phase capacitance and C corresponding to electrified indication sensor of switch cabinet21The A-phase capacitance omega corresponding to the charged indicating device1Is the angular frequency of the input pilot frequency current signal. According to the electrical equivalent circuit diagram provided in fig. 2, the capacitance (C) of the switch cabinet live indication sensor11、C12、C13) And a capacitance (C) of the charge indicating device21、C22、C23) Pilot frequency current i0Voltage u of different frequencyoAnd ω1Are all known amounts, and C12≈C13≈C11、C22≈C23≈C21、C0＝Ca//Cb//Cc(Ca、Cb、CcThe earth capacitances of the A phase, the B phase and the C phase, respectively), and therefore, C can be calculated by the formula (1)0。
Step S500: according to the total capacitance to ground C0Calculating to obtain the capacitance current I to groundcThe specific calculation formula is as follows:
wherein, ω is2Is the angular frequency of the system to be measured, typically a constant value, 50 Hz;
is a quiltAnd measuring system phase voltage.
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) and a capacitance current calculating module (5), 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 other end of the testing module (4) is electrically connected with the capacitance current calculating module (5);
the current output module (3) comprises a test terminal m and a grounding terminal o, wherein the test terminal m 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 and is used for outputting different-frequency current signals to the capacitance of the switch cabinet electrified indicating sensor and the capacitance of the electrified indicating device; and the grounding terminal o is electrically connected with the grounding terminal of the switch cabinet live indicating device.
2. The device according to claim 1, characterized in that it further comprises a display module (6), said display module (6) 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, the 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, and the grounding terminal o of the current output module (3) is electrically connected with the grounding terminal of the switch cabinet electrified indicating device.
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 the switch cabinet electrified indicating device, and 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;
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 module0Lower pilot frequency voltage uo；
According to the pilot frequency current signal i0And the pilot frequency current i0Lower pilot frequency voltage uoAnd calculating to obtain the total earth capacitance C of the neutral point ungrounded system0；
According to the total capacitance to ground C0Calculating to obtain the capacitance current I to groundc。
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 total capacitance to ground C0The calculation formula of (2) is as follows:
wherein, C11A-phase capacitance and C corresponding to electrified indication sensor of switch cabinet21The A-phase capacitance omega corresponding to the charged indicating device1Is the angular frequency of the input pilot frequency current signal.
7. Method according to claim 6, characterized in that the capacitance-to-ground current IcThe calculation formula of (2) is as follows:
wherein, ω is2Is the angular frequency of the system to be measured;
is the system phase voltage under test.
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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 |
| CN110297124B (en) * | 2019-08-06 | 2022-04-12 | 南方电网科学研究院有限责任公司 | Non-grounded voltage measuring device and method |
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