CN108957113B - Network-based transformer substation capacitance current online test system and test method - Google Patents
Network-based transformer substation capacitance current online test system and test method Download PDFInfo
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- CN108957113B CN108957113B CN201810792380.5A CN201810792380A CN108957113B CN 108957113 B CN108957113 B CN 108957113B CN 201810792380 A CN201810792380 A CN 201810792380A CN 108957113 B CN108957113 B CN 108957113B
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The invention discloses a network-based substation capacitance current online test system and a measurement method, wherein a CPU unit, a simulation board connected with the CPU unit, an interface board, a power supply unit, a touch screen unit, an arc extinguishing coil control unit and a resonance eliminator control unit are arranged, the simulation board is connected with the interface board, the interface board is connected with a multi-path circuit to be measured, the CPU unit is used for realizing multi-path measurement through the control of the interface board, the CPU unit is used for controlling the arc extinguishing coil control unit and the resonance eliminator control unit, the connection state and the state return of the arc extinguishing coil and the resonance eliminator are realized, the state stability of the resonance eliminator and the arc extinguishing coil is ensured, the automatic control of the states of the arc extinguishing coil and the resonance eliminator on the circuit to be measured is realized through the arc extinguishing coil control unit and the resonance eliminator control unit, the manual power failure operation during each measurement is avoided, and the states of the resonance eliminator and the arc extinguishing, the labor intensity of workers is reduced, and the result is accurate through automatic measurement of the CPU.
Description
Technical Field
The invention belongs to the technical field of research of a transformer substation capacitance current online test system, and relates to a network-based transformer substation capacitance current online test system and a network-based transformer substation capacitance current online test method.
Background
The accurate measurement of the current electric network to ground capacitance current is the premise of reasonable compensation of the arc extinguishing coil, and the measurement of the current automatic tracking compensation device to the capacitance current has some problems, especially the electric network asymmetry further decreases along with the increase of the cable line proportion. In the conventional measuring apparatus, the measurement accuracy of the network having a small asymmetry is greatly reduced, and even the measurement cannot be performed, so that it is necessary to expand the application range of the capacitance current measuring apparatus to meet the increasing demand. The capacitance current measurement principle based on the signal injection method is not only suitable for the traditional power grid, but also particularly suitable for the power grid with small power grid asymmetry, and can basically meet the actual requirements. The principle of the signal injection method is that a pilot frequency signal is continuously sent to a power grid from a microcomputer measuring and controlling device, a feedback signal from the power grid is received, and the current value of the capacitance to ground of the power grid can be obtained through calculation according to a corresponding equivalent circuit and algorithm.
According to the requirements of relevant electric power operation regulations, the capacitor current of an ungrounded system reaches 10A (35kV) and 30A (10kV), and an arc extinguishing coil must be installed at a system neutral point. When the system has single-phase grounding, the grounding point flows through the capacitance current, the neutral point has voltage displacement, and the arc extinguishing coil arranged at the neutral point provides inductance current, so that the capacitance current of the grounding point is compensated to a smaller value, the grounding arc short circuit is prevented, the voltage recovery speed of the arc gap is reduced, the insulation strength of the arc gap is improved, the arc reignition is prevented, and the intermittent grounding overvoltage is caused. The clamping effect of the arc extinguishing coil can also effectively prevent the generation of ferromagnetic resonance overvoltage.
When the test is carried out, the arc extinguishing coil on the neutral point is disconnected firstly, the condition that the arc extinguishing coil is disconnected or not is used as a judgment condition, and the state that the arc extinguishing coil is disconnected or not is returned to be used as a judgment condition for starting the test. The test is started only after the blowout coil is disconnected. And during testing, the resonance eliminator needs to be short-circuited, whether the short-circuit of the resonance eliminator is successful is judged, and the short-circuit is taken as a judgment condition for testing the capacitance current. The standard test principle is shown in fig. 1.
The system operation mode shown in fig. 1 is an operation mode necessary for measuring the capacitance current of the system from an open triangle, but for a general distribution network system, the system is not always in such an operation mode, for example, an arc extinguishing coil is further connected in the system, a high-resistance resonance eliminator is connected to a PT high-voltage side neutral point, a PT open triangle is connected with a secondary resonance elimination device, and the like. The operation of a conventional distribution network using 3PT wiring is shown in fig. 2.
In order to measure the capacitance current using the tester, the operation mode must be converted into the standard operation mode shown in fig. 1 and 3. The above needs secondary operators to cooperate and confirm.
In the prior art, when the capacitance current is measured each time, power failure is needed, the harmonic eliminator is in short circuit, the arc extinguishing coil is disconnected, power on measurement is carried out, power failure is continued after measurement is finished, and the original states of the harmonic eliminator and the arc extinguishing coil are restored; the state of the resonance eliminator and the quenching coil must be confirmed each time the person goes to the site.
Disclosure of Invention
The invention aims to provide a network-based substation capacitance and current online test system and a network-based substation capacitance and current online test method, so as to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the network-based transformer substation capacitance current online test system comprises a CPU unit, and a simulation board, an interface board, a power supply unit, a touch screen unit, an arc extinguishing coil control unit and a harmonic elimination device control unit which are connected with the CPU unit, wherein the simulation board is connected with the interface board;
the interface board is used for switching a plurality of paths of circuits to be tested;
the CPU unit is used for signal output, signal acquisition and signal processing;
the analog board comprises an excitation signal unit and a signal acquisition unit;
the CPU unit sends an excitation signal to the circuit to be tested through the analog board, and the signal acquisition unit is used for acquiring a feedback signal of the circuit to be tested and transmitting the feedback signal to the CPU unit;
the arc extinguishing coil control unit is used for controlling the connection state and the state return of an arc extinguishing coil on the circuit to be tested;
the resonance eliminator control unit is used for controlling the connection state and the state return of the resonance eliminator on the circuit to be detected;
the power supply unit is used for supplying power to the system, and the touch screen unit is used for operation control of the CPU unit.
The remote monitoring system further comprises a remote upper computer for realizing the remote operation control of the CPU unit, the remote upper computer is used for realizing the measurement and real-time monitoring of the capacitance current of the circuit to be measured at the remote end, the remote measurement, parameter calibration and parameter setting functions can be realized through the remote upper computer, and the measurement progress is displayed in real time through a monitoring interface on the remote upper computer.
Furthermore, the harmonic eliminator control unit and the arc extinguishing coil control unit respectively adopt an intelligent controller or a contactor and are used for state control and state return of the harmonic eliminator and the arc extinguishing coil on the circuit to be tested.
Further, the output terminal of the CPU unit is connected with a coil K of the contactor2The CPU unit passes through the coil K of the contactor2And the control switch K2 connected with the arc extinguishing coil in series on the arc extinguishing coil circuit is controlled to realize the open circuit and the open circuit of the arc extinguishing coil on the circuit to be tested, and the auxiliary contacts of the arc extinguishing coil are respectively connected to the feedback terminals of the CPU unit to realize the state return of the resonance eliminator.
Further, the output terminal of the CPU unit is connected with a coil K of the contactoriThe CPU unit passes through the coil K of the contactoriAnd a control switch K connected with the resonance eliminator in parallel on a resonance eliminator circuit is controlled to realize short circuit and passage of the resonance eliminator on a circuit to be tested, and auxiliary contacts of the resonance eliminator are respectively connected to feedback terminals of the CPU unit to realize state return of the resonance eliminator and the arc extinguishing coil.
Further, the CPU unit adopts a TMS320F2812CPU processor.
Furthermore, the power supply unit adopts a low-ripple low-noise excitation power supply.
Furthermore, the device also comprises a secondary resonance elimination control unit connected with the CPU unit, and the secondary resonance elimination control unit is used for controlling the connection state and the state return of the secondary resonance elimination device.
A transformer substation capacitance current online testing method is characterized by comprising the following steps:
step 1), a CPU unit sends a circuit switching signal to an interface board, and the interface board switches a test system to a path of circuit to be tested to be measured;
step 2), the CPU sends an electric signal for disconnecting the arc extinguishing coil from the circuit to be tested to the arc extinguishing coil control unit, the arc extinguishing coil control unit cuts off the arc extinguishing coil on the circuit to be tested, and the arc extinguishing coil control unit feeds back the connection state of the arc extinguishing coil and the circuit to be tested to the CPU; meanwhile, the CPU unit sends a harmonic elimination device signal on the short circuit to be tested to the harmonic elimination device control unit, the harmonic elimination device control unit short circuits a harmonic elimination device on the short circuit to be tested, and the harmonic elimination device control unit feeds back the connection state of the harmonic elimination device on the short circuit to be tested to the CPU unit;
and 3) the CPU unit receives feedback signals of the resonance elimination device control unit and the arc extinguishing coil control unit, if the resonance elimination device and the arc extinguishing coil are in a short circuit state and an open circuit state respectively, the CPU unit sends out an excitation signal for measuring capacitance current of the circuit to be measured to the analog board, the analog board transmits the excitation signal to the circuit to be measured through the interface board, the excitation signal passes through the circuit to be measured and then is fed back to the signal acquisition unit, the signal acquisition unit feeds back the excitation signal passing through the circuit to be measured to the CPU unit, and the CPU unit processes the excitation signal passing through the circuit to be measured, so that capacitance current detection on the circuit to be measured is realized.
Further, in step 2), if a secondary resonance elimination device is arranged in one path of circuit to be measured, which needs to be measured, the CPU unit sends an electric signal for disconnecting the secondary resonance elimination device from the circuit to be measured to the secondary resonance elimination control unit, and the secondary resonance elimination control unit disconnects the secondary resonance elimination device from the circuit to be measured.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a network-based substation capacitance current online test system, which is characterized in that a CPU unit, a simulation board, an interface board, a power supply unit, a touch screen unit, an arc extinguishing coil control unit and a resonance eliminator control unit which are connected with the CPU unit are arranged, the simulation board is connected with the interface board, the interface board is connected with a multi-path circuit to be tested, the CPU unit is used for realizing multi-path measurement through the control of the interface board, the CPU unit is used for controlling the arc extinguishing coil control unit and the resonance eliminator control unit, the connection state and the state return of the arc extinguishing coil and the resonance eliminator are realized, the state stability of the resonance eliminator and the arc extinguishing coil is ensured, the state automatic control of the arc extinguishing coil and the resonance eliminator on the circuit to be tested is realized through the arc extinguishing coil control unit and the resonance eliminator control unit, the operation of manual power cut during each measurement is avoided, the state of the resonance, the labor intensity of workers is reduced, the measuring efficiency is high, and the result is accurate through automatic measurement of the CPU.
Furthermore, the remote control system also comprises a remote upper computer for realizing remote operation control of the CPU unit, can realize remote control measurement, and is quick and convenient.
Furthermore, the CPU unit adopts a TMS320F2812CPU processor, so that the structure is stable and the efficiency is high.
A method for online testing capacitance and current of a transformer substation comprises the steps of firstly, controlling an interface board to be connected into a circuit to be tested through a CPU unit; the automatic control among the multiple paths of circuits to be tested is realized, then the CPU unit is used for controlling the arc extinguishing coil control unit and the resonance eliminator control unit, the resonance eliminator and the arc extinguishing coil on the circuits to be tested are controlled to be in a state to be tested, and the CPU unit receives state return signals of the arc extinguishing coil control unit and the resonance eliminator control unit; the data is accurate, and the manual power failure operation and the on-site confirmation of the states of the resonance eliminator and the arc extinguishing coil are avoided.
Furthermore, the CPU unit is used for controlling the secondary harmonic elimination control unit to realize the disconnection of the secondary harmonic elimination device, the full control of a primary operation circuit in the circuit to be tested can be realized by the CPU unit, and the phenomenon that the secondary harmonic elimination device is missed to be disconnected in manual operation to cause inaccurate results is avoided.
Drawings
Fig. 1 is a diagram of a conventional capacitance current measurement based on a signal injection method.
Fig. 2 is a diagram of a distribution network operation mode adopting a 3PT connection mode in the prior art.
Fig. 3 is a schematic diagram of a conventional switching of a distribution network operation mode.
FIG. 4 is a block diagram of the system of the present invention.
Fig. 5 is a circuit diagram of the CPU unit power supply and reset.
FIG. 6 is a memory circuit diagram of a CPU unit.
FIG. 7 is a circuit diagram of a CPU memory reading circuit.
Fig. 8 is a schematic diagram of an external terminal structure of the CPU unit.
Fig. 9 is a schematic circuit diagram of the analog board signal acquisition unit.
Fig. 10 is a circuit diagram of an analog board excitation signal unit.
FIG. 11 is a schematic diagram of a system power supply unit according to the present invention.
Fig. 12 is a schematic diagram of a system interface board of the present invention.
FIG. 13 is a diagram illustrating a system test structure according to the present invention.
Fig. 14 is a schematic view of the connection structure of the control unit of the quenching coil according to the present invention.
Fig. 15 is a schematic diagram of the connection structure of the control unit of the resonance eliminator.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 4 and 13, the network-based online testing system for capacitance and current of a transformer substation comprises a CPU unit, and a simulation board, an interface board, a power supply unit, a touch screen unit, an arc extinguishing coil control unit, and a resonance eliminator control unit connected to the CPU unit; the simulation board is connected with the interface board;
the interface board is used for switching a plurality of paths of circuits to be measured, and the interfaces of the interface board are simultaneously connected with a plurality of circuits to be measured which need to be measured;
the CPU unit is used for signal output, signal acquisition and signal processing;
the analog board comprises an excitation signal unit and a signal acquisition unit;
the CPU unit sends an excitation signal to the circuit to be tested through the analog board, and the signal acquisition unit is used for acquiring a feedback signal of the circuit to be tested and transmitting the feedback signal to the CPU unit;
the arc extinguishing coil control unit is used for controlling the connection state and the state return of an arc extinguishing coil on a circuit to be measured, disconnecting the arc extinguishing coil and returning the state when the capacitance current on the circuit to be measured needs to be measured, keeping the connection of the arc extinguishing coil when the measurement is not needed, and returning the connection state of the arc extinguishing coil to the CPU unit
The resonance eliminator control unit is used for controlling the connection state and the state return of the resonance eliminator on the circuit to be measured, short-circuiting the resonance eliminator when the capacitance current on the circuit to be measured needs to be measured, keeping the connection of the resonance eliminator when the capacitance current does not need to be measured, and returning the connection state of the resonance eliminator to the CPU unit;
the power supply unit is used for supplying power to the system, and the touch screen unit is used for operation control of the CPU unit.
The CPU unit adopts a TMS320F2812CPU processor; TMS320F2812 is a DSP processor, a 32-bit fixed-point high-speed digital processor and a maximum working frequency of 150M;
the second harmonic elimination control unit is connected to the CPU unit and is used for controlling the connection state and the state return of the second harmonic elimination device;
a transformer substation capacitance current online testing method is characterized by comprising the following steps:
step 1), a CPU unit sends a circuit switching signal to an interface board, and the interface board switches a test system to a path of circuit to be tested to be measured;
step 2), the CPU sends an electric signal for disconnecting the arc extinguishing coil from the circuit to be tested to the arc extinguishing coil control unit, the arc extinguishing coil control unit cuts off the arc extinguishing coil on the circuit to be tested, and the arc extinguishing coil control unit feeds back the connection state of the arc extinguishing coil and the circuit to be tested to the CPU; meanwhile, the CPU unit sends a harmonic elimination device signal on the short circuit to be tested to the harmonic elimination device control unit, the harmonic elimination device control unit short circuits a harmonic elimination device on the short circuit to be tested, and the harmonic elimination device control unit feeds back the connection state of the harmonic elimination device on the short circuit to be tested to the CPU unit;
and 3) the CPU unit receives feedback signals of the resonance elimination device control unit and the arc extinguishing coil control unit, if the resonance elimination device and the arc extinguishing coil are in a short circuit state and an open circuit state respectively, the CPU unit sends out an excitation signal for measuring capacitance current of the circuit to be measured to the analog board, the analog board transmits the excitation signal to the circuit to be measured through the interface board, the excitation signal passes through the circuit to be measured and then is fed back to the signal acquisition unit, the signal acquisition unit feeds back the excitation signal passing through the circuit to be measured to the CPU unit, and the CPU unit processes the excitation signal passing through the circuit to be measured, so that capacitance current detection on the circuit to be measured is realized.
In step 2), if a secondary resonance elimination device is arranged in one path of circuit to be measured, which needs to be measured, the CPU unit sends an electric signal for disconnecting the secondary resonance elimination device from the circuit to be measured to the secondary resonance elimination control unit, and the secondary resonance elimination control unit disconnects the secondary resonance elimination device from the circuit to be measured.
As shown in fig. 6, when/CE IS at a high level, IS61LV25616AL enters a standby mode; in this mode, power consumption can be reduced to the CMOS input standard; the memory extension IS realized by using a low trigger chip selection pin (/ CE) and an output enabling pin (/ OE) of the IS61LV25616 AL; the low trigger write enable pin (/ WE) will fully control the writing and reading of the memory; the same byte allows both high (/ UB) and low (/ LB) accesses;
as shown in fig. 7, a 128K × 16-bit FLASH is built in the TMS320F2812 chip, a user program can be conveniently solidified by using a programming plug-in, and the FLASH can be encrypted; TMS320F2812 is internally provided with 18K 16 bit SRAM; TMS320F2812 is internally provided with a 4K 16-bit BOOT ROM; TMS320F2812 is internally provided with 1K 16-bit OTP ROM; the 256K-8 bit RAM is expanded, the FM25L256B-G model is widely applied, and the device has an infinite read-write period and data retention of 10 years; an extension 256K by 16 bit SRAM, IS61LV25616 for data storage; IS61LV25616AL IS a high rate sram of 256K by 16 bits word length; the IS61LV25616AL IS manufactured by adopting a high-performance CMOS process of ISSI company, and has high performance and low power consumption; the special reset chip MAX706R ensures reliable reset, and has an independent reset button which can be reset manually;
as shown in fig. 8, two RS-232 paths of the CPU unit are connected to the serial port, and one RS-232 path is connected to the serial port touch screen unit, i.e., pin 155 and 157 pin touch screen units; the other path of RS-232 serial port is connected with a serial port of a USR-TCP232-T2 serial port switching network port; the special pin 90 and the special pin 91 are connected with a serial port-to-network port of USR-TCP 232-T2.
The CPU unit comprises 16 AD input interfaces, wherein 3 pins and 4 pins are connected to the analog board, a current limiting and operational amplifier circuit is arranged between the CPU unit and the analog board, and the input range is 0-3V;
as shown in fig. 5, since the I/O voltage of TMS320F2812 is 3.3V level and the ADC is 5V level, the level shift chip 74LVC245 is required to implement the isolation function; providing a 1-way DA output interface, MCP4921 is a 12-bit single channel with an external voltage reference and SPI interface. Used for generating 0-2.5V AC positive acoustic wave during measurement; providing 1 EEPROM (electrically erasable programmable read-Only memory) with a chip of 24LC64 for data transmission experiments with an IIC bus; an SPI interface is provided for leading out, so that networking is facilitated; providing an MCBSP interface lead-out; providing 6 paths of PWM wave output interfaces, and preventing reverse plug design; an external 2-way non-shielding interrupt source input interface; up to 5 routes of maskable interrupt source input interfaces are expanded, wherein 1 route can be triggered by a key; providing up to 50 CPLD IO interfaces; the DSP system adopts a plurality of system power supplies for power supply, and the TPS767D318 power supply chip can provide different power supplies (+5V, 3.3VA, 1.8V, GND and GNDF), and the maximum output current is 1000 MA;
the analog board comprises an excitation signal unit and a signal acquisition unit;
as shown in fig. 10, the excitation signal unit: a triangular signal from an external wiring terminal PT opening is sampled to obtain an external capacitance value, the external capacitance value is subjected to high-power MOS2SK1020 signal processing, an optical coupler 521 is isolated, and the external capacitance value is loaded on a 2.5V sine wave simulated by a single chip microcomputer.
As shown in fig. 9, the signal acquisition unit: the excitation signal is loaded to a CD4051B, namely a single 8-channel digital control analog electronic switch, three two-input control input ends A, B, C and INH input ends are provided, and the excitation signal has low on-resistance and very low off-leakage current; the digital signal with the amplitude of 4.5-20V can control the peak value to 20V analog signal, the analog signal is subjected to data processing by an operational amplifier TL082CP, the analog signal is sent to a MAX267, and the analog signal is converted into a digital signal and sent to a DSP for data processing; sending display and far-end upper computer.
As shown in fig. 11, the power supply unit is directly provided by the external power module, which is more stable and reliable; the power supply voltage for system operation is +5V, -5V, + 9V; an input alternating current of 220V is selected and input to the input end of a power supply unit after being switched, and the output voltages of the power supply unit are +5V, -5V, +9V, +12V respectively; the reliability and the stability of the system working power supply are ensured. The power supply supplying the excitation signal is +30V, -30V.
In the system, the sampling of the ripple and noise influence data of the excitation power supply is considered, and the excitation power supply is provided by adopting a power supply unit with low ripple and low noise.
As shown in fig. 12, the interface board receives a measurement signal sent by the CPU unit to measure a certain path, amplifies the measurement signal by the transistor to drive a corresponding certain path of relay, connects the measurement channel, and then sends an excitation signal through the CPU unit via the excitation signal sending unit, the excitation signal feeds back a return signal after passing through the circuit to be measured, and the signal acquisition unit transmits the acquired feedback signal to the CPU unit;
the communication network port measures and receives a communication protocol of a serial port of the mainboard, and the communication is carried out with the upper computer through the network port.
The state return is connected to the auxiliary contact of the corresponding relay, and the state return of the resonance eliminator and the arc extinguishing coil is realized through the judgment and feedback of the DSP.
A touch screen unit: the touch screen unit displays a full Chinese menu, is connected with a serial interface and supplies power at 5V; the touch screen unit can realize the functions of field test operation and parameter setting.
The remote upper computer is used for realizing the measurement and real-time monitoring of the capacitance current at the remote end, and can realize the functions of remote measurement, parameter calibration and parameter setting; and the monitoring interface displays the measurement progress in real time. The full control of the primary operation circuit in the circuit to be tested means that the short circuit or open circuit control is carried out on the resonance eliminator, the arc extinguishing coil and the secondary resonance eliminating device on the circuit to be tested at the same time, so that the circuit to be tested is in a state to be tested.
The harmonic eliminator control unit, the arc extinguishing coil control unit and the secondary harmonic elimination control unit respectively adopt an intelligent controller or a contactor to realize the state control and the state return of the harmonic eliminator and the arc extinguishing coil on the circuit to be tested; as shown in FIG. 14, the output terminal of the CPU unit is connected to the coil K of the contactor2Coil K of contactor2The control switch K2 which is connected with the arc extinguishing coil in series on the arc extinguishing coil circuit is controlled to realize the open circuit and the open circuit of the arc extinguishing coil on the circuit to be tested; as shown in FIG. 15, the output terminal of the CPU unit is connected to the coil K of the contactoriCoil K of contactor2A control switch K connected with the resonance eliminator in parallel on a resonance eliminator circuit is controlled to realize short circuit and passage of the resonance eliminator on a circuit to be detected; auxiliary contacts of the resonance eliminator and the arc extinguishing coil are respectively connected to feedback terminals of the CPU unit, and the state return of the resonance eliminator and the arc extinguishing coil is realized.
Claims (4)
1. The network-based transformer substation capacitance and current online test system is characterized by comprising a CPU unit, and a simulation board, an interface board, a power supply unit, a touch screen unit, an arc extinguishing coil control unit and a resonance eliminator control unit which are connected with the CPU unit, wherein the simulation board is connected with the interface board;
the interface board is used for switching a plurality of paths of circuits to be tested;
the CPU unit is used for signal output, signal acquisition and signal processing;
the analog board comprises an excitation signal unit and a signal acquisition unit;
the CPU unit sends an excitation signal to the circuit to be tested through the analog board, and the signal acquisition unit is used for acquiring a feedback signal of the circuit to be tested and transmitting the feedback signal to the CPU unit;
the arc extinguishing coil control unit is used for controlling the connection state and the state return of an arc extinguishing coil on the circuit to be tested;
the resonance eliminator control unit is used for controlling the connection state and the state return of the resonance eliminator on the circuit to be detected;
the power supply unit is used for supplying power to the system, and the touch screen unit is used for operation control of the CPU unit; the remote monitoring system comprises a CPU unit, a remote host computer and a resonance elimination controller, wherein the remote host computer is used for realizing the remote operation control of the CPU unit, the remote host computer is used for realizing the measurement and real-time monitoring of the capacitance current of a circuit to be measured at a remote end, the remote host computer can realize the remote measurement, the parameter calibration and the parameter setting functions, the monitoring interface on the remote host computer displays the measurement progress in real time, the resonance elimination controller control unit and the arc extinguishing coil control unit respectively adopt an intelligent controller or a contactor, the resonance elimination controller and the arc extinguishing coil control unit are used for the state control and the state return of the resonance elimination device and the arc extinguishing coil on the circuit2The CPU unit passes through the coil K of the contactor2The control switch K2 connected with the arc extinguishing coil in series on the arc extinguishing coil circuit is controlled to realize the open circuit and the open circuit of the arc extinguishing coil on the circuit to be tested, the auxiliary contact of the arc extinguishing coil is respectively connected to the feedback terminal of the CPU unit to realize the state return of the resonance eliminator, and the output terminal of the CPU unit is connected with the coil K of the contactoriThe CPU unit passes through the coil K of the contactoriControl switch K connected in parallel with the resonance eliminator on the control resonance eliminator lineThe short circuit and the path of the resonance eliminator on a circuit to be tested are realized, an auxiliary contact of the resonance eliminator is connected to a feedback terminal of the CPU unit respectively, the state return of the resonance eliminator and an arc extinguishing coil is realized, the power supply unit adopts a low-ripple low-noise excitation power supply, the resonance eliminator further comprises a secondary resonance elimination control unit connected to the CPU unit, and the secondary resonance elimination control unit is used for controlling the connection state and the state return of the secondary resonance eliminator.
2. The network-based substation capacitive current online testing system of claim 1, wherein the CPU unit employs a TMS320F2812CPU processor.
3. The transformer substation capacitance current online test method based on the transformer substation capacitance current online test system of claim 1 is characterized by comprising the following steps:
step 1), a CPU unit sends a circuit switching signal to an interface board, and the interface board switches a test system to a path of circuit to be tested to be measured;
step 2), the CPU sends an electric signal for disconnecting the arc extinguishing coil from the circuit to be tested to the arc extinguishing coil control unit, the arc extinguishing coil control unit cuts off the arc extinguishing coil on the circuit to be tested, and the arc extinguishing coil control unit feeds back the connection state of the arc extinguishing coil and the circuit to be tested to the CPU; meanwhile, the CPU unit sends a harmonic elimination device signal on the short circuit to be tested to the harmonic elimination device control unit, the harmonic elimination device control unit short circuits a harmonic elimination device on the short circuit to be tested, and the harmonic elimination device control unit feeds back the connection state of the harmonic elimination device on the short circuit to be tested to the CPU unit;
and 3) the CPU unit receives feedback signals of the resonance elimination device control unit and the arc extinguishing coil control unit, if the resonance elimination device and the arc extinguishing coil are in a short circuit state and an open circuit state respectively, the CPU unit sends out an excitation signal for measuring capacitance current of the circuit to be measured to the analog board, the analog board transmits the excitation signal to the circuit to be measured through the interface board, the excitation signal passes through the circuit to be measured and then is fed back to the signal acquisition unit, the signal acquisition unit feeds back the excitation signal passing through the circuit to be measured to the CPU unit, and the CPU unit processes the excitation signal passing through the circuit to be measured, so that capacitance current detection on the circuit to be measured is realized.
4. The substation capacitive current online testing method of claim 3,
in step 2), if a secondary resonance elimination device is arranged in one path of circuit to be measured, which needs to be measured, the CPU unit sends an electric signal for disconnecting the secondary resonance elimination device from the circuit to be measured to the secondary resonance elimination control unit, and the secondary resonance elimination control unit disconnects the secondary resonance elimination device from the circuit to be measured.
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| CN201430438Y (en) * | 2009-03-27 | 2010-03-24 | 淮南矿业(集团)有限责任公司 | Arc-extinguishing device |
| KR100973326B1 (en) * | 2010-04-21 | 2010-07-30 | (주)원방엔지니어링 | Harmonics absorptive power-factor improvement apparatus |
| CN105548665A (en) * | 2016-03-07 | 2016-05-04 | 云南电网有限责任公司玉溪供电局 | Device and method for online testing capacitive current of power grid |
| CN106129995A (en) * | 2016-08-28 | 2016-11-16 | 安徽普天电力科技有限公司 | A kind of novel convenient practical arc-extinguishing harmonic-eliminating and overvoltage protection three-in-one unit |
| CN206135409U (en) * | 2016-08-28 | 2017-04-26 | 安徽普天电力科技有限公司 | Novel convenient practical arc extinction harmonic elimination and overvoltage protection three way device |
| CN207232236U (en) * | 2017-08-30 | 2018-04-13 | 广西电网有限责任公司电力科学研究院 | A kind of training platform for being used for the test of 3 35kV capacitance current of distribution network |
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2018
- 2018-07-18 CN CN201810792380.5A patent/CN108957113B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201417945Y (en) * | 2009-03-17 | 2010-03-03 | 郭道胜 | Integrated device for arc extinction, harmonic elimination and wire selection for electricity grid |
| CN201430438Y (en) * | 2009-03-27 | 2010-03-24 | 淮南矿业(集团)有限责任公司 | Arc-extinguishing device |
| KR100973326B1 (en) * | 2010-04-21 | 2010-07-30 | (주)원방엔지니어링 | Harmonics absorptive power-factor improvement apparatus |
| CN105548665A (en) * | 2016-03-07 | 2016-05-04 | 云南电网有限责任公司玉溪供电局 | Device and method for online testing capacitive current of power grid |
| CN106129995A (en) * | 2016-08-28 | 2016-11-16 | 安徽普天电力科技有限公司 | A kind of novel convenient practical arc-extinguishing harmonic-eliminating and overvoltage protection three-in-one unit |
| CN206135409U (en) * | 2016-08-28 | 2017-04-26 | 安徽普天电力科技有限公司 | Novel convenient practical arc extinction harmonic elimination and overvoltage protection three way device |
| CN207232236U (en) * | 2017-08-30 | 2018-04-13 | 广西电网有限责任公司电力科学研究院 | A kind of training platform for being used for the test of 3 35kV capacitance current of distribution network |
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| CN108957113A (en) | 2018-12-07 |
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