CN108646125B - Method, device and system for testing capacitance current - Google Patents
Method, device and system for testing capacitance current Download PDFInfo
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- CN108646125B CN108646125B CN201810210672.3A CN201810210672A CN108646125B CN 108646125 B CN108646125 B CN 108646125B CN 201810210672 A CN201810210672 A CN 201810210672A CN 108646125 B CN108646125 B CN 108646125B
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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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- 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: electrically connecting the primary side of the electromagnetic voltage transformer with the phase a end, the phase b end and the phase c end of the switch cabinet electrification indicating device; a high-frequency voltage module of the capacitance current testing device outputs a preset pilot frequency current signal; the test module acquires pilot frequency voltage of a secondary side of the electromagnetic voltage transformer under the pilot frequency current signal; and calculating to obtain the total capacitance to ground and the capacitance current to ground of the non-grounded system of the neutral point according to the pilot frequency voltage, the pilot frequency current and the capacitance of the charged indication sensor. The invention skillfully utilizes the opening triangle of the electromagnetic voltage transformer to inject and measure the pilot frequency signal, and has the characteristics of high safety, strong anti-interference capability, convenient measurement and the like compared with the direct injection of the signal. The method has simple test loop, no power failure and high safety, and is suitable for testing the capacitance 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 an electromagnetic voltage 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 input end of the current output module and the testing module respectively, the other end of the testing module is electrically connected with the capacitance current calculating module, the secondary side of the electromagnetic voltage transformer is electrically connected with the output end of the current output module, and the primary side of the electromagnetic voltage transformer is electrically connected with the phase a end, the phase b end and the phase c end of a switch cabinet electrification indicating.
Preferably, the current output module comprises a test terminal m and a grounding terminal o, and the test terminal m is electrically connected with one end of a secondary side opening triangle of the electromagnetic voltage transformer; and the grounding terminal o is electrically connected with the other end of the secondary side opening triangle of the electromagnetic voltage transformer.
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 capacitive current testing system, which comprises any one of the devices, 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 primary side of the electromagnetic voltage transformer (6) is electrically connected with the phase a end, the phase b end and the phase c end of the switch cabinet electrification indicating device.
The invention also provides a method for testing the capacitance current, which comprises the following steps:
electrically connecting the primary side of the electromagnetic voltage transformer with the phase a end, the phase b end and the phase c end of the switch cabinet electrification 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 pilot frequency voltage u of the secondary side of the electromagnetic voltage transformer under the pilot frequency current signalo；
According to the pilot frequency voltage uoPilot frequency current i0And the capacitance of the charged indication sensor is calculated to obtain the total capacitance C to ground of the ungrounded neutral 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, C11Indicating for switch cabinet liveA-phase capacitance and C corresponding to sensor21A-phase capacitance, n corresponding to the charged indicating device1Is the number of turns of the primary winding of the electromagnetic voltage transformer, n2Is the number of turns, omega, of the secondary winding of the electromagnetic voltage transformer1Is 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 phase voltage of the system 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, a capacitance current calculating module and an electromagnetic voltage 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 input end of the current output module and the testing module respectively, the other end of the testing module is electrically connected with the capacitance current calculating module, the secondary side of the electromagnetic voltage transformer is electrically connected with the output end of the current output module, and the primary side of the electromagnetic voltage transformer is electrically connected with the phase a end, the phase b end and the phase c end of a switch cabinet. 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, and the electromagnetic voltage transformer is used for injecting signals to the switch cabinet electrification indicating device. The invention skillfully utilizes the opening triangle of the electromagnetic voltage transformer to inject and measure the pilot frequency signal, and has the characteristics of high safety, strong anti-interference capability, convenient measurement and the like compared with the direct injection of the signal. The device has simple test loop without power failure, high safety and suitability for testing the capacitance current of an 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 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, a capacitance-current measurement based on a switch cabinet live-line indicating device according to an embodiment of the present application is shownThe electrical wiring diagram of the test system and a system capacitance to ground measurement electrical equivalent circuit diagram. 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 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.
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 capacitance current testing device comprises 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 an electromagnetic voltage transformer 6, wherein one end of the high-frequency power supply module 2 is electrically connected with the power supplyThe other end of the module 1 is respectively and electrically connected with a current output module 3 and a test module 4, and the test module 4 is also respectively and electrically connected with a capacitance current calculation module 5 and an electromagnetic voltage transformer 6. 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 and the loop total current of the current output module 3, 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 preset programs and formulas, the capacitance current calculation module 5 can be a microprocessor such as an MCU (microprogrammed control unit) with calculation processing function, and the electromagnetic voltage transformer 6 is used for injecting signals to the switch cabinet electrification indicating device.
The invention skillfully utilizes the opening triangle of the electromagnetic voltage transformer to inject and measure the pilot frequency signal, and has the characteristics of high safety, strong anti-interference capability, convenient measurement and the like compared with the direct injection of the signal. The device has simple test loop without power failure, high safety and suitability for testing the capacitance current of an ungrounded system.
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. 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 the primary side of the electromagnetic voltage transformer is electrically connected with the phase a end, the phase b end and the phase c end of the switch cabinet electrification indicating device.
Step S200: and controlling a high-frequency voltage module of the capacitance current testing device to output a preset pilot frequency current signal. 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.
Step S300: the test module obtains pilot frequency voltage u of the secondary side of the electromagnetic voltage transformer under the pilot frequency current signalo。
Step S400: according to the pilot frequency voltage uoPilot frequency current i0And the capacitance of the charged indication sensor is calculated to obtain the total capacitance C to ground of the ungrounded neutral system0。
From the electrical equivalent circuit diagram provided in fig. 2, it can be seen that the capacitance (C) of the switch cabinet live indication sensor11、C12、C13) And a capacitance (C) of the charge indicating device21、C22、C23) Is known, and C12≈C13≈C11、C22≈C23≈C21、C0＝Ca//Cb//Cc. Therefore, C can be calculated by the formula (formula 1)0The specific calculation formula is as follows:
wherein, C11A-phase capacitance and C corresponding to electrified indication sensor of switch cabinet21A-phase capacitance, n corresponding to the charged indicating device1Is the number of turns of the primary winding of the electromagnetic voltage transformer, n2Is the number of turns, omega, of the secondary winding of the electromagnetic voltage transformer1Is the angular frequency of the input pilot frequency current signal.
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 the system phase voltage under test.
The capacitance current testing device and the testing method based on the capacitance current testing device have the advantages of simple testing loop, no power failure, high safety and the like, and are suitable for testing the capacitance current of an 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 (5)
1. A capacitance current testing device 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 an electromagnetic voltage transformer (6),
one end of the high-frequency power supply module (2) is electrically connected with the power supply module (1), and the other end of the high-frequency power supply module is electrically connected with the input end of the current output module (3) and the test module (4) respectively;
the other end of the test module (4) is electrically connected with the capacitance current calculation module (5);
the current output module (3) comprises a test terminal m and a grounding terminal o, the test terminal m is electrically connected with one end of a secondary side opening triangle of the electromagnetic voltage transformer (6), and the grounding terminal o is electrically connected with the other end of the secondary side opening triangle of the electromagnetic voltage transformer (6);
the primary side of the electromagnetic voltage transformer (6) is electrically connected with an a-phase end, a b-phase end and a c-phase end of a switch cabinet electrification indicating device, the a-phase end, the b-phase end and the c-phase end of the switch cabinet electrification indicating device are respectively and electrically connected with an electrification indicating sensor, and the electrification indicating sensor is electrically connected with a three-phase power supply of a system to be tested;
the capacitance current calculation module (5) is based on
Calculating to obtain the capacitance current I to ground of the non-grounded system of the neutral pointcWherein u isoIs the pilot frequency voltage i of the secondary side of the electromagnetic voltage transformer (6)0A pilot current signal, C, for the output of the high-frequency power supply module (2)0Total capacitance to ground, C, of the system without earth at neutral point11A-phase capacitance and C corresponding to electrified indication sensor of switch cabinet21A-phase capacitance, n corresponding to the charged indicating device1Is the number of turns of the primary winding of the electromagnetic voltage transformer (6), n2Is the number of turns, omega, of the secondary winding of the electromagnetic voltage transformer (6)1For the angular frequency, omega, of the input heterofrequency current signal2Is the angular frequency of the system to be measured,
For the tested lineThe phase voltage of the system.
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, the primary side of the electromagnetic voltage transformer (6) is electrically connected with the phase a end, the phase b end and the phase c end of the switch cabinet electrification indicating device.
4. A method for testing capacitance current is characterized by comprising the following steps:
electrically connecting a primary side of an electromagnetic voltage transformer with a phase a end, a phase b end and a phase c end of a switch cabinet electrification indicating device, electrically connecting a test terminal m of a current output module with one end of an opening triangle at a secondary side of the electromagnetic voltage transformer, and electrically connecting a grounding terminal o of the current output module with the other end of the opening triangle at the secondary side of the electromagnetic voltage transformer, wherein the phase a end, the phase b end and the phase c end of the switch cabinet electrification indicating device are respectively and electrically connected with an electrification indicating sensor which is electrically connected with a three-phase power supply of a system to be tested;
controlling a high-frequency voltage module of the capacitance current testing device to output a preset pilot frequency current signal;
the test module obtains pilot frequency voltage u of the secondary side of the electromagnetic voltage transformer under the pilot frequency current signalo；
According to the pilot frequency voltage uoPilot frequency current i0And the capacitance of the charged indication sensor is calculated to obtain the total capacitance C to ground of the ungrounded neutral system0The total capacitance to ground C0Is calculated by the formula
The switch cabinet electrification indicating device comprises a switch cabinet electrification indicating device, a switch cabinet electrification indicating sensor, a switch cabinet electrification indicating device and a control circuit, wherein the switch cabinet electrification indicating device comprises an a phase end, a b phase end and a C phase end which are respectively electrically11A-phase capacitance and C corresponding to electrified indication sensor of switch cabinet21A-phase capacitance, n corresponding to the charged indicating device1Is the number of turns of the primary winding of the electromagnetic voltage transformer, n2Is the number of turns, omega, of the secondary winding of the electromagnetic voltage transformer1The angular frequency of the input pilot frequency current signal;
according to the total capacitance to ground C0Calculating to obtain the capacitance current I to groundcThe 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 phase voltage of the system under test.
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.
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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 |
| CN114844519B (en) * | 2022-04-06 | 2023-10-10 | 杭州海康威视数字技术股份有限公司 | Isolation device for intrinsic safety circuit and non-intrinsic safety circuit |
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| 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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