CN105044442A - High-voltage live detection device - Google Patents

Abstract

The invention discloses a high-voltage electrification detection device, which includes a sensor, a high-voltage electrification display device, and an anti-mislocking drive device. The sensors are provided with three, and the three sensors correspond to A, B, and C three-phase high-voltage electrified bodies respectively. The sensor collects the current signal leaked by the high-voltage charged body, the high-voltage charged display device displays the charged state of the high-voltage charged body, and the anti-mistake locking drive device is provided with an anti-mistake device interface, and the anti-mistake device interface is connected to the anti-mistake device. device connection. In the present invention, when the judging result is high voltage electrification, one signal is used to drive the LED of the display module for display to complete the electrification display function, and the other signal is transmitted to the anti-mistaken locking drive device for locking drive to complete the locking output function.

Description

A high-voltage live detection device

technical field

The invention relates to electric power technology, in particular to high-voltage charged detection technology.

Background technique

The high-voltage live display is a device to indicate whether the line is live. It can intuitively prompt the on-site operators to prevent accidental entry into the charged interval and misoperation to a certain extent; secondly, it can be interfaced with the anti-mistake device to incorporate mandatory locking. Foreign high-voltage live display devices are mostly integrated in complete sets of equipment, which only have a display function and have no locking function.

Contents of the invention

The technical problem to be solved by the present invention is to provide a high-voltage electrification detection device, which realizes high-voltage electrification display and has a locking function.

In order to solve the above technical problems, the present invention adopts the following technical scheme: a high-voltage electrification detection device, including a sensor, a high-voltage electrification display device, and an anti-mislocking drive device. The sensors are provided with three, and the three sensors correspond to A, B, C three-phase high-voltage charged body, the sensor collects the current signal leaked by the high-voltage charged body, the high-voltage charged display device displays the charged state of the high-voltage charged body, and the anti-misoperation locking drive device is provided with an anti-mistake device interface, The interface of the anti-mistake device is connected with the anti-mistake device; when any phase or more of the three-phase high-voltage electrified body is charged, the high-voltage electrified display device displays the electrified state, and at the same time, the anti-mistake locking drive device controls the anti-mistake The wrong device is locked.

Preferably, the sensor is used to detect the leakage current signal of the arrester.

Preferably, the sensor adopts an electromagnetic core-through current sensor, and the sensor adopts a permalloy iron core.

Preferably, the sensor is connected with a TVS tube in parallel at the current output end.

Preferably, the interface of the anti-malfunction device includes an electromagnetic lock interface and a computer key interface.

Preferably, the computer key interface is integrated with a voltage detection circuit, a current detection circuit, and a resistance detection circuit.

Preferably, the voltage detection circuit includes a series connected resistor R1, resistor R2, voltmeter, and high-voltage charging display output contact. When any phase or more of the three-phase high-voltage charged body is charged, the high-voltage charging display output contact is opened, and the circuit is disconnected. On, the voltmeter detects that the open circuit voltage is 0V.

Preferably, the current detection circuit includes resistors R1, R2, ammeters, and high-voltage charging display output contacts connected in series. When any phase or more of the three-phase high-voltage charging body is charged, the high-voltage charging display output contacts are opened and the circuit is disconnected. , the ammeter detects that the short-circuit current is 0A.

Preferably, the resistance detection circuit includes resistors R1, R2, and high-voltage electrified display output contacts connected in series. The high-voltage electrified display output contacts are connected in parallel with a resistance meter. The high-voltage live display output contact is open, the circuit is disconnected, and the resistance detected by the resistance meter is infinite.

Preferably, the high-voltage charged display device is provided with a high-voltage charged analysis module, and the high-voltage charged analysis module analyzes the current signal leaked by the high-voltage charged body collected by the sensor, and judges that any phase or more of the three-phase high-voltage charged body is charged. state, the high-voltage live analysis module transmits the switch signal to the display module and the anti-mislocking drive device.

In the present invention, the signals of "A, B, C" three-phase high-voltage electrified body leakage current are respectively collected by three sensors, and are transmitted to the high-voltage electrified display device for comparison and judgment. When the judgment result is high-voltage electrified, one signal is used to drive the display The LED of the module is displayed to complete the live display function, and the other signal is transmitted to the anti-misoperation locking drive device for locking drive to complete the locking output function.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

Fig. 1 is a structural principle diagram of the present invention;

Fig. 2 is a schematic diagram of a voltage detection circuit;

Fig. 3 is a schematic diagram of a current detection circuit;

Figure 4 is a schematic diagram of a resistance detection circuit.

Detailed ways

As shown in Figure 1, a high-voltage live detection device includes a sensor, a high-voltage live display device 10, and an anti-mislocking drive device. The sensors are provided with three, and the three sensors correspond to A, B, and C three-phase high-voltage Charged body, the sensor collects the current signal leaked by the high-voltage charged body, the high-voltage charged display device displays the charged state of the high-voltage charged body, the anti-misoperation locking drive device is provided with a drive circuit 11 and an anti-mistake device interface, the The interface of the anti-mistake device is connected with the anti-mistake device; when more than one phase (including one phase, two phases, and three phases) of the three-phase high-voltage electrified body is in the charged state, the high-voltage electrified display device will display the electrified state, and at the same time The anti-misoperation locking driving device controls the anti-misoperation device to perform locking.

After investigation, the existing outdoor lines of the substation are equipped with lightning arresters. The leakage current signal of the lightning arrester can be used as the induced current signal of the sensor, input to the display host, and after corresponding processing, the charged state of the equipment is displayed.

In addition, considering the actual situation of on-site installation and safe operation, an electromagnetic core-through current sensor is adopted, and permalloy with high initial magnetic permeability and low loss is selected as the iron core. The sensor can accurately detect 30uA ~ 15mA power frequency current with an accuracy of 1%. It has excellent temperature characteristics and electromagnetic field interference ability, and fully meets the accuracy requirements of equipment sampling under complex power station on-site interference.

Sensor shell size: 42x40x18(mm), hole diameter: 22mm, sensor shell is stainless steel sheet, coil is 1000 turns, current ratio 1000:1, input current 30μA-150mA, output current 30nA-150μA. The coil output wires are 3-core shielded wires, 2 are current output wires, and the other wire is connected to the stainless steel shell. The current test accuracy of the sensor in the range of 30μA-150mA is 1%; when there is no current input, the test current value is <5μA; therefore, in actual use, if the test current value is >30μA, and it is 50HZ (there is a certain error in the field frequency) sine wave , it can be considered that the arrester is working in a charged state. The sensor is connected in parallel with a TVS tube at the current output end, and when a lightning overvoltage occurs, the potential is clamped at a certain voltage value to prevent damage to the acquisition unit.

Wherein, the high-voltage electrification display device is provided with a high-voltage electrification analysis module, and the high-voltage electrification analysis module analyzes the current signal leaked by the high-voltage electrified body collected by the sensor. The high-voltage live analysis module transmits the switch signal to the display module and the anti-mislocking driving device.

At present, there are mainly two kinds of anti-misoperation devices in the power system, the first is the electromagnetic lock, and the second is the microcomputer anti-misoperation locking system. The cooperation between the anti-misoperation locking drive device and the electromagnetic lock is relatively simple, and the electromagnetic The operating power of the lock is sufficient. Relatively speaking, the interface of the microcomputer anti-misoperation locking system is much more complicated. Usually, there are three types of detection of empty contacts, voltage and current. way of a unified interface.

Wherein, the anti-malfunction device interface includes an electromagnetic lock interface 12 and a computer key interface 13 . The electromagnetic lock interface 12 is used to cooperate with the electromagnetic lock, and the computer key interface is integrated with a voltage detection circuit, a current detection circuit, and a resistance detection circuit to adapt to various electric inspection methods.

As shown in Figure 2, the voltage detection circuit includes resistors R1, R2, voltmeter, and high-voltage charging display output contacts connected in series. When any phase or more of the three-phase high-voltage charging body is charged, the high-voltage charging display output contacts are opened. , the circuit is disconnected, and the voltmeter detects that the open circuit voltage is 0V. The voltmeter measurement function of the computer key judges whether the line is charged by detecting the voltage value of points 1 and 2, and writes the anti-mistake logic to forcibly lock the grounding switch or prohibit the temporary grounding wire.

As shown in Figure 3, the current detection circuit includes a series connected resistor R1, resistor R2, ammeter, and high-voltage charged display output contact. When any one phase or more of the three-phase high-voltage charged body is charged, the high-voltage charged display output contact is opened. The circuit is disconnected, and the ammeter detects that the short-circuit current is 0A. The ammeter measurement function of the computer key judges whether the line is charged by detecting the short-circuit current value of points 3 and 4, and writes the anti-mistake logic to forcibly lock the grounding switch or prohibit the temporary grounding wire.

As shown in Figure 4, the resistance detection circuit includes resistors R1, R2, and high-voltage live display output contacts connected in series. The high-voltage live display output contacts are connected in parallel with a resistance meter. When charged, the output contact of the high-voltage charged display is opened, the circuit is disconnected, and the resistance detected by the resistance meter is infinite. The resistance meter measurement function of the computer key judges whether the line is charged by detecting the resistance value of points 5 and 6, and writes the anti-mistake logic to forcibly lock the grounding knife switch or prohibit the temporary grounding wire.

The present invention integrates 3 kinds of electricity testing methods, but only one is actually used when wiring, for example: if the anti-misoperation locking is voltage type, then use voltage detection type circuit wiring; if the anti-misoperation locking is current type , then use the current detection type circuit wiring; if the anti-misoperation blocking is resistance type, then use the resistance detection type circuit wiring.

The invention can meet the electrical inspection requirements of computer keys of all microcomputer anti-misoperation locking systems, and the wiring is simple. The computer key of the microcomputer anti-misoperation locking system is a hand-held device, especially when operating in rainy weather, there is a hidden danger of electric leakage during power inspection. This interface is designed with R1 and R2 as current-limiting protection resistors to limit the current (voltage) within a safe range. Prevent personal injury caused by 220V voltage to operators.

Claims (10)

1. an electrification in high voltage pick-up unit, it is characterized in that: comprise sensor, high voltage display device, anti-misoperation locking drive unit, described sensor is provided with three, described three sensors corresponding A, B, C three-phase high-voltage electrified body respectively, described sensor gathers the current signal that high-voltage charged body is revealed, described high voltage display device shows high-voltage charged body electriferous state, described anti-misoperation locking drive unit is provided with error-proof device interface, and described error-proof device interface is connected with error-proof device; When being electriferous state more than any mutually in three-phase high-voltage electrified body, described high voltage display device is then shown as electriferous state, and described anti-misoperation locking drive unit control error-proof device carries out locking simultaneously.

2. a kind of electrification in high voltage pick-up unit according to claim 1, is characterized in that: described sensor is for detecting the Leakage Current signal of lightning arrester.

3. a kind of electrification in high voltage pick-up unit according to claim 2, is characterized in that: described sensor adopts electromagnetic type punching current sensor, and described sensor adopts permalloy iron core.

4. a kind of electrification in high voltage pick-up unit according to claim 2, is characterized in that: described sensor is parallel with TVS pipe at current output terminal.

5. a kind of electrification in high voltage pick-up unit according to Claims 1-4 any one, is characterized in that: described error-proof device interface comprises electromagnetic lock interface and computer key interface.

6. a kind of electrification in high voltage pick-up unit according to claim 5, is characterized in that: described computer key Interface integration has voltage detecting type circuit, current detection type circuit, resistance detection type circuit.

7. a kind of electrification in high voltage pick-up unit according to claim 6, it is characterized in that: described voltage detecting type circuit comprises resistance R1, resistance R2, voltage table, the HV live displaying output contact of series connection, time charged more than a phase any in three-phase high-voltage electrified body, HV live displaying output contact is opened, circuit disconnects, and voltage table detects that open-circuit voltage is 0V.

8. a kind of electrification in high voltage pick-up unit according to claim 6, it is characterized in that: described current detection type circuit comprises resistance R1, resistance R2, reometer, the HV live displaying output contact of series connection, time charged more than a phase any in three-phase high-voltage electrified body, HV live displaying output contact is opened, circuit disconnects, and reometer detects that short-circuit current is 0A.

9. a kind of electrification in high voltage pick-up unit according to claim 6, it is characterized in that: described resistance detection type circuit comprises resistance R1, resistance R2, the HV live displaying output contact of series connection, described HV live displaying output contact is parallel with an ohmmeter, time charged more than a phase any in three-phase high-voltage electrified body, HV live displaying output contact is opened, circuit disconnects, and the resistance that ohmmeter detects is for infinitely great.

10. a kind of electrification in high voltage pick-up unit according to claim 1, it is characterized in that: described high voltage display device is provided with electrification in high voltage analysis module, described electrification in high voltage analysis module is analyzed the current signal that the high-voltage charged body of sensor collection is revealed, when judging in three-phase high-voltage electrified body more than any phase as electriferous state, described electrification in high voltage analysis module by omicronff signal transmission to display module and anti-misoperation locking drive unit.