CN102707206B - Reclosure device for insulation detection - Google Patents

Abstract

The invention discloses a reclosing device, in particular to an insulation detection reclosing device, which belongs to the technical field of electric power system relay protection. The insulation detection reclosing device has the following structure: the insulation detection device (2) used to detect the phase-to-phase or ground insulation of the primary equipment is connected to the detected high-voltage primary equipment (1), and the output terminal of the insulation detection device (2) is connected to the reclosing device. The input end of the gate microprocessor (5) is connected, and the output end of the reclosing microprocessor (5) is connected with the circuit breaker (6), the display (3) and the loudspeaker (4). The invention can carry out insulation detection with induced voltage on the double-circuit parallel lines tripped due to faults, and control the reclosing action according to the detection results, effectively ensuring the safe and stable operation of the power system.

Description

Insulation detection reclosing device

technical field

The invention relates to a reclosing device, in particular to an insulation detection reclosing device, which belongs to the technical field of electric power system relay protection.

Background technique

At present, the basic principles of relay protection in power systems are: overhead line protection of each voltage level is equipped with reclosing devices, cable lines are not equipped with reclosing devices; busbar protection is not equipped with reclosing devices; transformer protection is not equipped with reclosing devices.

For the above-mentioned reclosing device that cooperates with the protection of overhead lines, for the reclosing device of the power end protection of the single-side power line, after the line fails, the protection action trips the switch to remove the fault point, and then performs a reclosing in a gambling manner. If the instantaneous fault insulation is restored, the reclosure is successful; if the previous fault is a permanent fault, the reclosure fails if the insulation of the fault point is not restored, and the line is tripped again by protection. For the bus protection device, it is only because of the fear that the first failure of the bus may cause a permanent failure, that is, the fear that the fault current generated by the bus failure will be large, and the overlap at the fault point will cause destructive impact on the switch and other primary equipment and systems. It is obviously blind and unscientific to adopt the protection configuration scheme of busbar protection without reclosing.

At present, there are some technical problems in the known principle of reclosing relay protection of various primary equipment in the power system as follows: 1) When a permanent fault occurs on the overhead transmission line, blindly performing a reclosing will bring electrical or electrical damage to the primary switch and other equipment. Mechanical destructive impact, especially if the switch cannot withstand the continuous opening and breaking operation and refuses to move when it trips for the second time after reclosing at the fault point, it will expand the scope of the accident and have a serious impact on the stability of the power system. 2) When a transient fault occurs on the busbar, the power transmission of the system can be restored immediately by simple reclosing on one side, but after repeated inspection and communication between the operating personnel and the power system dispatching and commanding personnel, the power transmission of each component of the busbar is often It takes several hours, especially in natural environments such as heavy wind and snow, which are prone to continuous short-circuit faults of power equipment, etc., it is very easy to expand the scope of the accident and make the system unstable.

Contents of the invention

The technical problem to be solved by the present invention is to provide an insulation detection reclosing device. When the primary equipment of the power system fails, the present invention can control the reclosing action according to the fault recovery situation, effectively ensuring the safe and stable operation of the power system.

In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions:

The insulation detection reclosing device has the following structure: the insulation detection device used to detect the phase-to-phase or ground insulation of the primary equipment is connected to the detected high-voltage primary equipment, and the output terminal of the insulation detection device is connected to the input terminal of the reclosing microprocessor. The output of the reclosing microprocessor is connected to the circuit breaker, display and loudspeaker.

The output terminal of the above-mentioned reclosing microprocessor is also connected with a display and a loudspeaker.

The above-mentioned high-voltage primary equipment to be detected is a power transmission line, a bus bar or a transformer.

The above-mentioned reclosing microprocessor is an ARM-LPC4357 chip.

The above-mentioned reclosing microprocessor can also be a reclosing device.

Owing to adopting above-mentioned technical scheme, make the present invention have following advantage and effect:

The invention can carry out insulation detection with induced voltage on the double-circuit parallel lines tripped due to faults, and control the reclosing action according to the detection results, thus ensuring the safe and stable operation of the power system.

Description of drawings

Fig. 1 is a structural block diagram of the present invention.

Fig. 2 is a schematic circuit diagram of the static insulation detection of an empty busbar or an overhead line without induced voltage by the insulation detection device of the present invention.

Fig. 3 is a schematic circuit diagram of the dynamic insulation detection of overhead lines or busbars with induced voltage by the insulation detection device of the present invention.

Fig. 4 is a schematic circuit diagram of dynamic or static insulation detection by the insulation detection device of the present invention through the principle of series circuit voltage division.

In the figure, 1. High-voltage primary equipment to be detected, 2. Insulation detection device, 3. Display, 4. Loudspeaker, 5. Reclosing microprocessor, 6. Circuit breaker.

Detailed ways

The present invention will be further described below in conjunction with the examples, but the protection scope of the present invention is not limited by the examples.

As shown in Figure 1, the insulation detection reclosing device of the present invention has the following structure: the insulation detection device 2 used to detect the phase-to-phase or ground insulation of the primary equipment is connected to the detected high-voltage primary equipment 1, and the output terminal of the insulation detection device 2 It is connected with the input end of the reclosing microprocessor 5 , and the output end of the reclosing microprocessor 5 is connected with the circuit breaker 6 , the display 3 and the loudspeaker 4 .

The above-mentioned detected high-voltage primary equipment 1 is a power transmission line, a bus bar or a transformer. The reclosing microprocessor 5 is an ARM-LPC4357 chip or a reclosing device produced by a relay protection manufacturer, and the reclosing device is an existing market product.

The insulation detection device 2 is used to detect the phase-to-phase or ground insulation of primary equipment. This is a well-known technology in the art. Below, three different detection principles of the insulation detection device 2 are listed, but this cannot be used to limit the specific structure of the insulation detection device 2. , as long as it is a device that can detect the insulation condition of high-voltage primary equipment.

As shown in Figure 2, the insulation detection device 2 is used for static insulation detection of empty busbars or overhead lines without induced voltage. It mainly performs static insulation tests on empty busbars or overhead lines without induced voltage through transformer impedance transformation. : It is mainly to measure whether there is an obvious unremoved grounding wire on the bus, that is, it is hung up by the operator during a temporary power failure, and whether there is a metallic short circuit. When the normal situation is that the capacitor has no voltage, if there is an abnormal situation, the voltage can be detected.

As shown in Figure 3, the insulation detection device detects the dynamic insulation of overhead lines or bus bars with induced voltage. If it clearly distinguishes the dynamic insulation of overhead lines or bus bars with certain induced voltages through the size and state of the DC transient current waveform Condition.

As shown in Figure 4, the insulation detection device performs dynamic or static insulation detection through the principle of series circuit voltage division. It mainly performs insulation testing through the principle of series circuit voltage division. When the time is through, the voltage added to the primary bus or line by the insulation detection device through the step-up transformer will all drop on the measurement capacitor, and the insulation detection device can measure a sufficiently high voltage, which is greater than the set value; if the three-phase bus or When the transmission line is well insulated from ground or between phases, the voltage on the measuring capacitor is very small and lower than the set value.

The above three insulation detection devices can measure whether the insulation condition of the high-voltage primary equipment is good, and determine whether the busbar protection or line protection can be closed. But this cannot be used to limit the protection scope of the present invention. The CPUs in Fig. 2, Fig. 3 and Fig. 4 are all ARM-LPC4357 chips.

The working principle of the present invention is as follows:

The insulation detection device 2 detects the insulation condition of the detected high-voltage primary equipment 1, and outputs the detection result to the reclosing microprocessor 5, and the reclosing microprocessor 5 performs data analysis and calculation after receiving the detection result of the insulation detection device 2, and The control signal is output to the circuit breaker 6 to control the action of the circuit breaker 6. At the same time, the reclosing microprocessor 5 also outputs the technical results to the display 3 and the speaker 4 to provide operating instructions for the operating personnel.

According to the detection results of the insulation detection device, the present invention judges the insulation recovery situation of the disconnected line or busbar due to a fault, or judges the insulation situation of an unloaded line or busbar without power transmission; and then determines whether a closing command should be issued Or whether the line can be powered by hand.

The invention combines the reclosing device and the insulation monitoring device to form a new device that meets the requirements of the smart grid. This is an innovative protection emphasized by the invention, and the invention effectively ensures the safe and stable operation of the power system.

Claims (1)

1. reclosure device for insulation detection, it is characterized in that structure is as follows: be connected with detected high pressure primary equipment (1) for detecting primary equipment insulation detection device (2) that is alternate or insulation against ground situation, the output terminal of insulation detection device (2) is connected with the input end of reclosing microprocessor (5), and the output terminal of reclosing microprocessor (5) is connected with isolating switch (6); The output terminal of described reclosing microprocessor (5) is also connected with display (3) and loudspeaker (4); Described detected high pressure primary equipment (1) is transmission line of electricity, bus or transformer;

Insulation detection device (2) detects the insulation situation of detected high pressure primary equipment (1), and the static insulating for the overhead transmission line to aircraft carrier line or non-inductive voltage detects; The overhead transmission line of the mode converted by transformer impedance to aircraft carrier line or non-inductive voltage carries out static insulating test; And testing result is exported to reclosing microprocessor (5), reclosing microprocessor (5) carries out data analytical calculation after receiving insulation detection device (2) testing result, and control signal is exported to isolating switch (6), control isolating switch (6) action, testing result is also exported to display (3) and loudspeaker (4), for providing operational order for operation personnel by reclosing microprocessor (5) simultaneously;

Operation personnel judge the insulation recovery situation by the circuit that disconnects because of fault or bus according to shown testing result, or judge that one does not have the nonloaded line of power transmission or the insulation situation of bus; Then determine whether to send close a floodgate order or circuit and whether can close the order of power transmission by hand.