CN208140862U - A kind of high-voltage fence long-distance intelligent fault wave recording device - Google Patents

Abstract

The utility model discloses a remote intelligent fault recording device for a high-voltage power grid, which comprises a current signal processing circuit, a data acquisition circuit, a data memory, a power frequency signal acquisition circuit, a fault discrimination circuit, a fault threshold setting circuit, a communication circuit, a time base Electric circuit and inductive power-taking circuit; a remote intelligent fault recording device for a high-voltage power grid described in the utility model can determine the location of a fault in a high-voltage line in real time and improve the efficiency of line maintenance.

Description

A remote intelligent fault recording device for high-voltage power grid

technical field

The utility model relates to the field of grid distributed fault monitoring, in particular to a remote intelligent fault recording device for a high-voltage power grid.

Background technique

Power supply is the main artery of the national economy, and the transmission of power needs to be completed by safe and reliable transmission lines. Transmission lines are long and widely distributed. During the "Eleventh Five-Year Plan" period, the State Grid plans to have 640,000 kilometers of transmission lines above 110kV, and the plan to reach 1 million kilometers during the "Twelfth Five-Year Plan"; the Northeast Power Grid has 1,203 220kV lines; and there are tens of thousands of lines above 35kV nationwide.

In recent years, transmission line tripping faults caused by lightning strikes, typhoons, and external force damage have occurred frequently, and thousands of fault tripping events occur every year, which have been highly valued by the power system production, operation, and management departments.

Every trip of the transmission line will not only bring impact to the system, but also damage the power facilities such as insulators and wires, leaving potential safety hazards and seriously affecting the safe and stable operation of the power grid. In actual production and operation, the causes of transmission line fault tripping are complex and there are many influencing factors. Due to the lack of necessary and effective transmission line fault monitoring technology and means, and the error of traditional transmission line fault location devices is relatively large, it leads to the failure point to be found after a fault occurs. Difficult; due to the fact that there are many trans-provincial and trans-regional lines in the management of transmission lines that are managed by multiple companies, there is a phenomenon that multiple companies jointly patrol lines to find fault points during operation and maintenance, which wastes manpower and material resources and affects the timely operation of the power grid. Restore power.

Therefore, it is necessary to relate to a real-time monitoring device to avoid the above disadvantages.

Contents of the invention

Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a remote intelligent fault recording device for high-voltage power grids, which can record the signal waveform data and occurrence time when a fault occurs, and improve the efficiency of fault diagnosis of the power grid.

Technical solution: In order to achieve the above purpose, a remote intelligent fault recording device for a high-voltage power grid of the present invention includes a current signal processing circuit, a data acquisition circuit, a data memory, a power frequency signal acquisition circuit, a fault discrimination circuit, and a fault threshold setting circuit , a communication circuit, a time base circuit and an induction power-taking circuit; the signal output end of the current signal processing circuit is respectively connected with the signal input end of the data acquisition circuit, the signal input end of the industrial frequency signal acquisition circuit and the signal input end of the fault discrimination circuit Signal connection; the signal output end of the power frequency signal acquisition circuit is respectively connected with the signal input end signal of the fault threshold setting circuit and the communication circuit; the signal output end of the fault threshold setting circuit is respectively connected with the signal input of the fault discrimination circuit terminal signal connection; the signal output terminal of the fault discrimination circuit is connected with the signal input terminal signal of the data acquisition circuit; the signal output terminal of the data acquisition circuit is connected with the signal input terminal signal of the data memory; the signal output of the data memory It is connected with the signal input terminal of the communication circuit; the signal output terminal of the time base circuit is connected with the signal input terminal of the communication circuit; The acquisition circuit, the fault discrimination circuit, the fault threshold setting circuit, the communication circuit and the time base circuit are electrically connected.

Further, the signal processing circuit includes a Rogowski coil, a first integrator and a second integrator; the signal output terminals of the Rogowski coil are connected to the signal input terminals of the first integrator and the second integrator respectively; the The signal output end of the first integrator is connected with the signal input end signal of the data acquisition circuit; the signal output end of the second integrator is respectively connected with the signal input end of the power frequency signal acquisition circuit and the signal input end signal of the fault discrimination circuit .

Further, the time base circuit includes a GPS module, a temperature-compensated crystal oscillator, a timing circuit and a GPS antenna; the signal output terminal of the temperature-compensated crystal oscillator is connected to the signal input terminal of the timing circuit; the signal output terminal of the GPS antenna is connected to the signal input terminal of the timing circuit. The signal input terminal of the GPS module is connected to the signal; the signal output terminal of the GPS module is connected to the signal input terminal of the timing circuit; the signal connection between the GPS module and the power frequency signal acquisition circuit is connected.

Further, the inductive power-taking circuit includes an inductive power-taking coil, a protection circuit, an automatic load adjustment circuit, a step-down circuit, a charging circuit, a backup battery, and a boost circuit; the power-taking coil is electrically connected to the protection circuit; The protection circuit is electrically connected to the automatic load adjustment circuit; the automatic load adjustment circuit is electrically connected to the step-down circuit; the step-down circuit is electrically connected to the charging circuit, and the charging circuit is electrically connected to the backup battery. The backup battery is electrically connected to the boost circuit, and the boost circuit is connected to the current signal processing circuit, data acquisition circuit, data memory, power frequency signal acquisition circuit, fault discrimination circuit, fault threshold setting circuit, communication circuit, time base The circuit is electrically connected.

Further, the communication circuit adopts a 3G communication module.

Further, a monitoring terminal is also included, and the communication circuit 7 is connected to the monitoring terminal with signals.

Beneficial effects: The beneficial effects of the utility model are as follows: (1) Distribute a plurality of remote intelligent fault recording devices of a high-voltage power grid on the transmission line, decompose the transmission line into several sections, and record the power frequency fault current and Current traveling wave, using power frequency fault current to first determine the fault interval, and then carry out traveling wave positioning in the interval, so as to realize accurate positioning of transmission line faults; (2) multiple high-voltage power grid remote intelligent fault recording devices Distributed on the transmission line, it not only conducts discretized monitoring of the inherent parameters that affect the measurement error, such as the length of the transmission line and the sag of the conductor, but also effectively reduces the change of the traveling wave velocity and the propagation attenuation distortion due to the shortening of the monitoring section of each monitoring device. and other factors on the fault location accuracy, thereby greatly improving the accuracy of transmission line fault location.

Description of drawings

Accompanying drawing 1 is the schematic diagram of principle of the utility model;

Accompanying drawing 2 is the expanded schematic diagram of the utility model;

Accompanying drawing 3 is the structural representation of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further.

A high-voltage remote intelligent fault recording and broadcasting device as described in accompanying drawings 1 to 3, including a current signal processing circuit 1, a data acquisition circuit 2, a data memory 3, a power frequency signal acquisition circuit 4, a fault discrimination circuit 5, a fault Threshold setting circuit 6, communication circuit 7, time base circuit 8 and induction power-taking circuit 9; The signal output end of described current signal processing circuit 1 is respectively connected with the signal input end of data acquisition circuit 2, the power frequency signal acquisition circuit 4 The signal input terminal of the signal input terminal is connected with the signal input terminal signal of the fault discrimination circuit 5; the signal output terminal of the power frequency signal acquisition circuit 4 is respectively connected with the signal input terminal signal of the fault threshold setting circuit 6 and the communication circuit 7; the fault threshold The signal output end of setting circuit 6 is connected with the signal input end signal of fault discrimination circuit 5 respectively; The signal output end of described fault discrimination circuit 5 is connected with the signal input end signal of data acquisition circuit 2; The signal output end is connected to the signal input end of the data memory 3; the signal output of the data memory 3 is connected to the signal input end of the communication circuit 7; the signal output end of the time base circuit 8 is connected to the signal input of the communication circuit 7 terminal signal connection; the induction power-taking circuit 9 is respectively connected with the current signal processing circuit 1, the data acquisition circuit 2, the data memory 3, the power frequency signal acquisition circuit 4, the fault discrimination circuit 5, the fault threshold setting circuit 6, the communication circuit 7 and the time The base circuit 8 is electrically connected.

Described signal processing circuit 1 comprises Rogowski coil 101, first integrator 102 and second integrator 103; Connect; the signal output end of the first integrator 102 is connected with the signal input end signal of the data acquisition circuit 2; the signal output end of the second integrator 103 is connected with the signal input end and the fault of the power frequency signal acquisition circuit 4 respectively The signal input terminal of the discriminant circuit 5 is connected to the signal; the current signal is detected by the Rogowski coil 101, and the signal is integrated, amplified and filtered by the first integrator 102 and the second integrator 103 to extract the power frequency current signal and the high frequency line respectively. Wave current signal, through the abnormal power frequency current to identify whether a fault occurs and record the fault signal waveform data in time.

The data acquisition circuit 2 is composed of a high-speed AD201, a control circuit 202 and an address counting circuit 203; the signal output terminal of the first integrator 102 is connected to the signal input terminal of the high-speed AD201.

The data memory 3 is realized by using a static RAM, and IS61LV51216 is used for specific implementation in this embodiment.

The power frequency signal acquisition circuit 4 is realized by a single-chip microcomputer, which is realized by using STM32F103C8T6 in this embodiment.

The failure discrimination circuit 5 is implemented using a high-speed comparator.

The fault threshold setting circuit 6 is implemented using the height DA.

The communication circuit 7 adopts a 3G communication module, and the 3G communication module includes a communication antenna 701 and a GPRS communication module 702; the communication antenna 701 and the GPRS communication module 702 are connected by signals. The signal output end of the power frequency signal acquisition circuit 4 is connected to the signal input end of the GPRS communication module 702. The utility model uses a GPS timing signal plus a high-precision temperature-compensated crystal oscillator to realize high-precision timing, and is used to ensure correct recording of faults. moment of occurrence.

Described time base circuit 8 comprises GPS module 801, temperature-compensated crystal oscillator 802, timing circuit 803 and GPS antenna 804; The signal output terminal of described temperature-compensated crystal oscillator 802 is connected with the signal input terminal signal of timing circuit 803; The signal of GPS module 801 The output end is connected with the signal input end of the timing circuit 803; the signal output end of the GPS antenna 804 is connected with the signal input end signal of the GPS module 801; the signal connection between the GPS module 801 and the industrial frequency signal acquisition circuit 4 .

The control circuit 202, the address counting circuit 203 and the timing circuit 803 can use one FPGA chip. The signal output end of the high-speed AD is connected to the signal input end of the FPGA chip.

The induction power-taking circuit 9 includes an induction power-taking coil, a protection circuit, an automatic load adjustment circuit, a step-down circuit, a charging circuit, a backup battery and a boost circuit; the induction power-taking coil takes power, and then absorbs high-voltage transient The pulse, and then through the load automatic adjustment circuit to limit the voltage within a certain range, and then through the step-down circuit to reduce the voltage to 5v, and then send it to the charging circuit to charge the battery, and the battery voltage is boosted to 5V output.

The utility model uses inductive power acquisition and lithium battery backup power supply to ensure the need for long-term continuous monitoring, and at the same time, it can maintain a certain working time in the case of power failure due to failure.

The functional circuits of the device are packaged and placed in the casing 10. In this embodiment, the casing 10 has a rectangular shape as a whole, as shown in FIG. 3 . Both sides of the housing 10 have circular holes for passing cables. The induction power-taking coil and the Rogowski coil 101 are threaded on the cable for taking power and sampling current signals. There are mounting brackets 1001, mounting studs 1002 and mounting studs 1003 inside the housing 10 for mounting the circuit board. Other parts of the inductive power fetching circuit 9 except the induction power fetching coil are combined and installed on the inductive power fetching circuit board 11 . Current signal processing circuit 1, data acquisition circuit 2, data memory 3, power frequency signal acquisition circuit 4, fault discrimination circuit 5, fault threshold setting circuit 6, communication circuit 7 and time base circuit 8 are combined and installed on the signal acquisition and transmission line plate 12. The induction circuit board 11 and the signal acquisition and transmission circuit board 12 are installed on the mounting stud 1002 and the mounting stud 1003 by screws. The communication antenna 701 is installed on the casing 10 and connected to the signal collection and transmission circuit board 12 through a connecting wire. The GPS antenna 804 is installed on the casing 10, and is connected to the signal collection and transmission circuit board through a connection line. The rest of the circuits can be realized by conventional circuits.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (5)

1. a kind of high-voltage fence long-distance intelligent fault wave recording device, it is characterised in that：Including current signal processing circuit (1), number According to Acquisition Circuit (2), data storage (3), power frequency component Acquisition Circuit (4), fault distinguishing circuit (5), fault threshold setting Circuit (6), telecommunication circuit (7), time base circuit (8) and induction power-supply circuit (9)；The letter of the current signal processing circuit (1) Number output end respectively with the signal input part of data acquisition circuit (2), power frequency component Acquisition Circuit (4) signal input part and therefore Barrier differentiates the signal input part signal connection of circuit (5)；The signal output end of the power frequency component Acquisition Circuit (4) respectively with therefore Barrier threshold sets circuit (6) is connected with the signal input part signal of telecommunication circuit (7)；The fault threshold initialization circuit (6) Signal output end is connect with the signal input part signal of fault distinguishing circuit (5) respectively；The signal of the fault distinguishing circuit (5) Output end is connect with the signal input part signal of data acquisition circuit (2)；The signal output end of the data acquisition circuit (2) with The signal input part signal of data storage (3) connects；The signal output end of the data storage (3) and telecommunication circuit (7) Signal input part signal connection；The signal output end of the time base circuit (8) and the signal input part signal of telecommunication circuit (7) Connection；Incude power-supply circuit (9) respectively with current signal processing circuit (1), data acquisition circuit (2), data storage (3), Power frequency component Acquisition Circuit (4), fault distinguishing circuit (5), fault threshold initialization circuit (6), telecommunication circuit (7) and time base circuit (8) it is electrically connected.

2. a kind of high-voltage fence long-distance intelligent fault wave recording device according to claim 1, it is characterised in that：The signal Processing circuit (1) includes Rogowski coil (101), first integrator (102) and second integral device (103)；The Rogowski coil (101) signal output end is connect with the signal input part signal of first integrator (102) and second integral device (103) respectively； The signal output end of the first integrator (102) is connect with the signal input part signal of data acquisition circuit (2)；Described second The signal output end of integrator (103) respectively with the signal input part of power frequency component Acquisition Circuit (4) and fault distinguishing circuit (5) Signal input part signal connection.

3. a kind of high-voltage fence long-distance intelligent fault wave recording device according to claim 1, it is characterised in that：Base when described Circuit (8) includes GPS module (801), temperature compensating crystal oscillator (802), timing circuit (803) and GPS antenna (804)；The temperature compensation is brilliant The signal output end of vibration (802) is connect with the signal input part signal of timing circuit (803)；The signal of the GPS antenna (804) Output end is connect with the signal input part signal of GPS module (801)；The signal output end and timing circuit of GPS module (801) (803) signal input part signal connection；Signal is connect between the GPS module (801) and power frequency component Acquisition Circuit (4).

4. a kind of high-voltage fence long-distance intelligent fault wave recording device according to claim 1, it is characterised in that：The induction Power-supply circuit (9) includes induction electricity taking coil, protection circuit, automatic load adjusting circuit, reduction voltage circuit, charging circuit, standby Battery and booster circuit；The electricity taking coil and protection circuit are electrically connected；The protection circuit and automatic load adjusting circuit It is electrically connected；The automatic load adjusting circuit and reduction voltage circuit are electrically connected；The reduction voltage circuit electrically connects with charging circuit It connects, the charging circuit and backup battery are electrically connected, and the backup battery and booster circuit are electrically connected, the booster circuit Output end respectively with current signal processing circuit (1), data acquisition circuit (2), data storage (3), power frequency component acquire Circuit (4), fault distinguishing circuit (5), fault threshold initialization circuit (6), telecommunication circuit (7), time base circuit (8) are electrically connected.

5. a kind of high-voltage fence long-distance intelligent fault wave recording device according to claim 1, it is characterised in that：The communication Circuit (7) uses 3G communication module.