CN106526291A - Bypass operation low voltage rapid conversion device, and monitoring, releasing and displaying methods thereof - Google Patents

Abstract

The invention discloses a low-voltage fast switching device for bypass operation and its monitoring, tripping and displaying methods. The circuit breaker is independently controlled by an electronic tripper to disconnect, and the voltage detection module collects the ABC phase voltage of the outlet terminal of the circuit breaker and then detects the output voltage. signal; the current detection module outputs a current detection signal after collecting the ABC phase current at the outlet end; the zero-sequence current detection module outputs a zero-sequence current detection signal after collecting the zero-sequence current at the outlet end of the circuit breaker; the control module is coupled to the display module, the voltage detection module, Current detection module and zero-sequence current detection module; the display module displays the amplitude of ABC phase voltage and phase current and the amplitude of zero-sequence current, and the control module judges according to the detected phase current amplitude or zero-sequence current amplitude Control the electronic trip unit to open the circuit breaker. It can quickly open, close and open automatically and manually, and has multi-parameter status display, which improves the safety and reliability of construction work for live grid maintenance workers.

Description

Low-voltage fast switching device for bypass operation and its monitoring, tripping and displaying methods

technical field

The invention relates to a high-voltage detection technology, in particular to a low-voltage fast switching device for bypass operation used in the live maintenance operation of a power grid and its monitoring, tripping and displaying methods.

Background technique

With the rapid development of my country's power grid business, live maintenance has become an inevitable and important means to effectively ensure the safe operation and stable power supply of the power grid. Threat to life safety. Due to cumbersome work procedures and harsh working environment and other factors, the live maintenance construction workers tend to ignore the dangers around them, resulting in inadvertently getting too close to high-voltage live equipment, resulting in casualties of maintenance construction personnel. Therefore, how to effectively protect the life safety of the operators during the construction operation of live maintenance, enhance the safe operation management of live work, and prevent and avoid the occurrence of safety accidents has become an important research project in the field of live maintenance work. However, at present, my country's control over the construction process of live-line maintenance mainly relies on the supervision of dedicated guardians with rich practical experience in live-line work and combined with the consciousness of construction workers. However, in the course of their work, the construction workers for live maintenance of the power grid, because the construction site operating points involve a wide range of areas, and the maintenance work is heavy, the operators are prone to fatigue, and thus the energy is not effective enough and highly concentrated, and construction violations are prone to occur, resulting in safety hazards. Accidents happen. Therefore, relying only on the observation ability of the dedicated guardians and the self-consciousness of the construction workers, it is generally difficult to reliably guarantee the effective control of the construction work process of the on-site live maintenance of the power grid. Although in the construction process of the above-mentioned live maintenance work of the power grid, sometimes a live maintenance vehicle is needed, but because the output low-voltage end of the equipment has no obvious disconnection point and display point, the operation of the equipment is very complicated; because the live maintenance vehicle Equipped with high-voltage switches and low-voltage equipment, the live working vehicle is close to the high-voltage line and away from the user during work, and every opening and closing must be inspected on the working vehicle, and the inspection information is sent to the remote control center, which is remotely controlled by the control center , first open and close the high-voltage switch, and then de-energize the low-voltage equipment; although this can improve the safety of live maintenance construction operations, there are also problems in the monitoring operation that are very complicated on the one hand, and on the other hand, there are misoperations in the control center that cause maintenance There are potential safety hazards of on-site accidents, and the use of remote control centers relies on the rapidity of network communication to a greater extent. Once there is a problem with the network, it will bring great potential safety accidents.

Contents of the invention

The present invention is provided to solve the problems existing in the existing power grid live inspection and maintenance construction operations, such as many operating points on the construction site involving a wide range of areas, heavy maintenance work, safety warning protection that cannot be carried out safely, reliably and effectively, and large hidden dangers in maintenance and construction operations. A fast breaking, automatic and manual closing and opening, with voltage display, current display that is tracking protection and opening and closing status display, to a greater extent improve the safety and reliability of construction workers for live maintenance maintenance workers A low-voltage fast switching device for road work and methods for monitoring, tripping and displaying the same.

The specific technical solution adopted by the present invention to solve the above technical problems is: a low-voltage rapid switching device for bypass operation, which is built in a live working vehicle, and is characterized in that it includes a voltage detection module, a current detection module, a zero-sequence current detection module, Control module, display module, circuit breaker and electronic trip unit; the circuit breaker is set on the side of the three-phase voltage outgoing line, the circuit breaker is independently controlled by the corresponding electronic trip unit to disconnect, and the voltage detection module collects A and B at the outgoing line end of the circuit breaker , C-phase voltage, output voltage detection signal after being processed by voltage transformer and operational amplifier; The sequence current detection module collects the zero-sequence current at the outlet end of the circuit breaker, and outputs the zero-sequence current detection signal after being processed by the current transformer and the operational amplifier; the control module is coupled to the voltage detection module, the current detection module and the zero-sequence current detection module for Receive the voltage detection signal, current detection signal and zero-sequence current detection signal; the control module is coupled to the display module, and the A, B, and C phase voltages of the outlet terminals of the circuit breaker are displayed in the display module according to the voltage detection signal, and are displayed on the display according to the current detection signal The module displays the amplitudes of A, B, and C phase currents at the outlets of the circuit breaker, and judges and controls the electronic release to disconnect the circuit breaker based on the detected phase current amplitudes, and displays zero in the display module based on the zero-sequence current detection signal. The magnitude of the sequence current and the detected zero-sequence current magnitude judge and control the electronic release to disconnect the circuit breaker. When the maintenance and construction personnel of the power grid are performing live maintenance work, they can effectively judge the maintenance work according to the phase voltage, phase current and zero-sequence current information displayed by the display module of the low-voltage fast switching device for bypass operation on the work vehicle. It plays an effective safety warning and early warning role; and the conversion device on the work vehicle automatically performs rapid opening and closing of the circuit breaker according to the detected phase voltage, phase current, and zero-sequence current data information to avoid maintenance accidents The occurrence of the occurrence, while providing a safety warning function, it can achieve the effect of fast and effective safety protection for the live maintenance construction personnel. It integrates a variety of multiple protections, and improves the safety and reliability of the power grid live maintenance construction personnel to a greater extent. It can be used at the maintenance construction site Safe and effective control at the first time to avoid accidents; avoid various defects caused by the use of remote control center for control, and effectively protect the lives and property safety of live grid maintenance workers.

As a preference, the control module is provided with a plurality of rated phase current reference values with different multiples and corresponding disconnection time values, the disconnection time value decreases with the increase of the rated phase current reference value, and the control module is based on Detect the comparison result of the obtained phase current detection signal and the set rated phase current reference value, and judge whether to control the electronic release to disconnect the circuit breaker. To a greater extent, it can prevent insufficient safety protection or non-disconnection that may be caused by one disconnection, improve the multiple safety protection functions of the maintenance construction site to a greater extent, and maximize the control to avoid the occurrence of safety hazards in site maintenance operations. .

As a preference, the control module is provided with a plurality of rated zero-sequence current reference values with different multiples and corresponding disconnection time values, the disconnection time value decreases with the increase of the rated zero-sequence current reference value, and the control The module judges whether to control the electronic release to disconnect the circuit breaker according to the comparison result of the zero-sequence current detection signal obtained through detection and the set rated zero-sequence current reference value. To a greater extent, it can prevent insufficient safety protection or non-disconnection that may be caused by one disconnection, improve the multiple safety protection functions of the maintenance construction site to a greater extent, and maximize the control to avoid the occurrence of safety hazards in site maintenance operations. .

Preferably, it also includes a selection module, which uses two groups of circuit breakers of different power types, and the selection module selects two groups of circuit breakers of different models for manual or automatic voltage access. In the automatic selection mode, the control module selects the circuit breaker according to the voltage detection signal One set of circuit breakers is tapped into the voltage. Improve the optional flexibility of on-site maintenance and construction operations, and flexibly choose according to the actual situation of on-site maintenance and construction operations. At the same time, the two sets of structures also improve the safety protection effect, preventing the construction site from being unable to safely construct due to a failure of one set of structures. Improve the efficiency of construction operations.

Preferably, the electronic release includes a triode, a relay and a release connector, the base of the triode is connected to the control module, the collector of the triode is electrically connected to the normally open relay coil, and the two ends of the normally open relay contacts are electrically connected to the disconnector. Buckle connector. Improve the operating efficiency of electronic trip units to open circuit breakers.

Another object of the present invention is to provide a detection method for low-voltage rapid switching of bypass operation, which is characterized in that: it includes the following steps

A phase voltage detection step of collecting the A, B, and C phase voltages of one of the above technical solutions, respectively processing the A, B, and C phase voltages, and obtaining the effective phase voltage display value;

According to the effective value of the A, B, C phase voltage in one of claims 1 to 5, the step of automatically connecting the voltage or manually connecting the voltage;

Collect the A, B, and C phase currents formed after the A, B, and C phase voltages of one of the above technical solutions are connected, respectively process the A, B, and C phase currents, and obtain the described in claims 1 to 5 A phase current detection step of the effective phase current amplitude display value;

Collect the zero-sequence phase current formed after the A, B, and C phase voltages of one of the above-mentioned technical solutions are connected, and process the zero-sequence current to obtain the zero-sequence value of the effective zero-sequence current amplitude display value of one of the above-mentioned technical solutions current detection step. According to the phase voltage, phase current, and zero-sequence current data obtained by the detection, it provides safety warning data display information for maintenance construction personnel, and automatically trips and disconnects the circuit breaker in time to improve on-site safety protection for on-site maintenance construction personnel. .

Preferably, it includes a phase current comparison detection step of comparing the phase current amplitude with the set rated phase current reference value, and comparing the zero-sequence current amplitude with the set rated zero-sequence current reference value Zero-sequence current comparison detection step.

Yet another object of the present invention is to provide a low-voltage rapid transfer tripping method for bypass operation, which is characterized in that it includes the following steps

A rated current setting step for setting multiple rated phase current reference values and multiple rated zero-sequence current reference values, where each reference value represents the rated phase current or rated zero-sequence current of one of the above-mentioned technical solutions with different multiples;

Steps for setting the disengagement time corresponding to multiple rated phase current reference values and multiple rated zero-sequence current reference values; the disconnection time value follows the rated zero-sequence current reference value or rated zero-sequence current reference decrease as the value increases;

Comparing the phase current detection signal obtained through detection with the set rated phase current reference value, and judging whether to control the tripping step of one of the above technical solutions, the electronic release device disconnecting the circuit breaker;

Comparing the obtained zero-sequence current detection signal with the set rated zero-sequence current reference value, it is judged whether to control the tripping step of one of the above-mentioned technical solutions, the electronic trip unit, to disconnect the circuit breaker. According to the phase voltage, phase current, and zero-sequence current data obtained by the detection, it provides safety warning data display information for maintenance construction personnel, and automatically trips and disconnects the circuit breaker in time to improve on-site safety protection for on-site maintenance construction personnel. .

Preferably, the rated phase current reference value and the rated zero-sequence current reference value are respectively configured as 5, and the 5 rated phase current reference values respectively represent 1.05 times the rated current, 1.3 times the rated current, 1.5 times the rated current, 1.8 times the rated current and 2 times the rated current; if the detected phase current amplitude is 1.05 to 1.3 times the rated current, do not disconnect the phase current preceding circuit; if the detected phase current amplitude is 1.3 to 1.5 times the rated current , the time required to disconnect the pre-stage circuit of the phase current is 2200s; if the detected phase current amplitude is 1.5 to 1.8 times the rated current, the time required to disconnect the pre-stage circuit of the phase current is 1500s; When the current amplitude is 1.8 to 2 times the rated current, the time required to disconnect the phase current preceding circuit is 800s; if the detected phase current amplitude is greater than 2 times the rated current, the time required to disconnect the phase current preceding circuit for 300s. The greater the danger, the shorter the response time required to trip and disconnect the circuit breaker, to a greater extent prevent the occurrence of insufficient safety protection or non-disconnection that may be caused by one disconnection, and to a greater extent improve the inspection and maintenance of the construction site. Multiple safety protection functions, maximum control to avoid safety hazards in on-site maintenance operations.

Yet another object of the present invention is to provide a low-voltage fast switching display method for bypass operation, which is characterized in that it includes a zero-sequence current reference value setting step of setting the rated zero-sequence current reference value of one of the above-mentioned technical solutions , each reference value represents the rated zero-sequence current of one of the above-mentioned technical solutions with different multiples; compare the zero-sequence current amplitude with multiple rated zero-sequence current reference values, and each time the zero-sequence current amplitude is greater than a reference value, the The zero-sequence current reference value display step of the zero-sequence current reference value; the zero-sequence current reference value configuration is 5, respectively 50mA, 100mA, 200mA, 300mA and 500mA; The sequence current is 50mA; if the zero sequence current amplitude is 100mA～200mA, the display zero sequence current is 100mA; if the zero sequence current amplitude is 200mA～300mA, the display zero sequence current is 200mA; if the zero sequence current amplitude is 300mA～500mA, The displayed zero-sequence current is 300mA; if the amplitude of the zero-sequence current is greater than 500mA, the displayed zero-sequence current is 500mA. Set a clear danger alarm parameter display point, the greater the danger, the greater the displayed data information, the more clear and effective the warning effect, and to a greater extent prevent the occurrence of insufficient safety protection or non-disconnection that may be caused by one disconnection, and more Improve the multiple safety protection functions of the inspection and maintenance construction site to a large extent, and control to the greatest extent to avoid the occurrence of safety hazards in the on-site inspection and maintenance operation.

The beneficial effects of the present invention are: fast breaking, automatic and manual closing and opening, voltage display, current display means tracking protection, residual current display means tracking protection and opening and closing state display, and greatly improve the power grid live maintenance. The safety and reliability of the construction work of the construction workers; when the power grid maintenance and construction personnel are performing live maintenance work, they can effectively use the phase voltage, phase current and Zero-sequence current-related information is used to judge the safety of maintenance and construction operations, which plays an effective safety warning and early warning role; and the conversion device on the work vehicle automatically performs fast and fast operation according to the detected phase voltage, phase current, and zero-sequence current data information. The opening and closing circuit breaker can avoid the occurrence of accidents in maintenance operations, and achieve the effect of fast and effective safety protection for live maintenance construction personnel while providing safety warning. Safety and reliability, it can be safely and effectively controlled to avoid accidents at the first time on the inspection and maintenance work site; it can avoid various defects caused by the use of remote control center for control, and effectively protect the lives and property safety of live grid maintenance operators.

Description of drawings:

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram 1 of the structure and principle of the low-voltage quick switching device for bypass operation of the present invention.

Fig. 2 is the second schematic diagram of the structure and principle of the low-voltage rapid switching device for bypass operation of the present invention.

Fig. 3 is a schematic diagram 3 of the structure and principle of the low-voltage rapid switching device for bypass operation of the present invention.

Fig. 4 is a schematic diagram 4 of the structure and principle of the low-voltage rapid switching device for bypass operation of the present invention.

Fig. 5 is a schematic diagram 5 of the structure and principle of the low-voltage rapid switching device for bypass operation of the present invention.

Fig. 6 is a schematic flow chart of the detection method of the low-voltage rapid switching device for bypass operation of the present invention.

Fig. 7 is a schematic flow chart of the tripping method of the low-voltage quick switching device for bypass operation according to the present invention.

Fig. 8 is a schematic flowchart of the display method of the low-voltage rapid switching device for bypass operation of the present invention.

detailed description

Example 1:

In the embodiment shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, and Fig. 5, a low-voltage rapid switching device for bypass operation is built in a live working vehicle, including a voltage detection module 40, a current detection module 50, a zero sequence Current detection module 70, control module 30, display module 30, circuit breaker and electronic trip unit 20; the circuit breaker is set on the side of the three-phase voltage outgoing line, and the circuit breaker is independently controlled by the corresponding electronic trip unit to disconnect, and the voltage detection module Collect the A, B, and C phase voltages at the outlets of the circuit breaker, and output voltage detection signals after being processed by voltage transformers and operational amplifiers; After processing, the current detection signal is output; the zero-sequence current detection module collects the zero-sequence current at the outlet end of the circuit breaker, and outputs the zero-sequence current detection signal after being processed by the current transformer and operational amplifier; the control module is coupled to the voltage detection module, current detection module and The zero-sequence current detection module is used to receive the voltage detection signal, current detection signal and zero-sequence current detection signal; the control module is coupled to the display module, and displays the A, B, and C phases of the outlet terminal of the circuit breaker in the display module according to the voltage detection signal Voltage, according to the current detection signal, the amplitudes of A, B, and C phase currents at the outlet terminals of the circuit breaker are displayed in the display module, and the electronic tripper is controlled to disconnect the circuit breaker according to the detected phase current amplitudes. The detection signal displays the amplitude of the zero-sequence current in the display module, and judges and controls the electronic release to disconnect the circuit breaker according to the detected amplitude of the zero-sequence current. The display module 60 includes a display screen 61 using LEDs or LCDs. The control module 30 includes an integrated chip 31 . The voltage detection module 40 is provided with multiple operational amplifiers, and the input terminals of each operational amplifier are electrically connected to the outlet terminals of the three-phase voltage. There are multiple rated phase current reference values with different multiples and their corresponding disconnection time values inside the control module. The disconnection time value decreases with the increase of the rated phase current reference value. The control module detects the The signal is compared with the set rated phase current reference value to determine whether to control the electronic release to disconnect the circuit breaker. If the phase current detection signal does not reach the smallest one among multiple rated zero-sequence current reference values, the circuit breaker will not be disconnected. There are several rated zero-sequence current reference values with different multiples inside the control module and their corresponding disconnection time values. The disconnection time value decreases with the increase of the rated zero-sequence current reference value. The comparison result of the sequence current detection signal and the set rated zero-sequence current reference value is used to determine whether to control the electronic release to disconnect the circuit breaker. If the zero-sequence current detection signal does not reach the smallest one among multiple rated zero-sequence current reference values, the circuit breaker is not disconnected. There is a selection module in the low-voltage fast switching device for bypass operation, which uses two sets of circuit breakers of different power types. The selection module selects two sets of circuit breakers of different types for manual or automatic input voltage. Select one of the circuit breakers to access the voltage according to the voltage detection signal. Among them, the 800A output circuit breaker 10 of circuit A is controlled by the QF1 electronic trip unit 20 of model 800A, and the output circuit breaker 10A of circuit B of 400A is controlled by the QF2 electronic trip unit 20A of model 400A.

The electronic trip unit includes a triode 21, a relay 22 and a trip unit connector 23, the base of the triode 21 is electrically connected to the control module 30, the collector of the triode 21 is electrically connected to the coil of the normally open relay 22, and both ends of the contacts of the normally open relay 22 Electrically connect the release connector 23. By adopting the above technical scheme, since the low-voltage quick switching device for bypass operation is built into the live working vehicle and connected to the low-voltage control part of the live working vehicle, it is used to control the high-voltage switch of the live working vehicle. Therefore, the control of the high-voltage switch is not sufficient. It needs to go through the control center, and the status of the high-voltage switch can be displayed through the display module. In addition, it also avoids potential safety hazards on site caused by misoperation of the control center.

Fig. 1 includes two circuit breakers of different models, an 800A circuit breaker and a 400A circuit breaker in this embodiment, each of the two circuit breakers is controlled by a separate electronic release.

Figure 2 includes a voltage detection module that collects voltages of phases A, B, and C, including 800A circuit breakers and 400A circuit breakers, and outputs voltage detection signals after being processed by voltage transformers and operational amplifiers; the control module is coupled to the voltage detection module, It is used to receive the voltage detection signal, and is also coupled to the display module. According to the voltage detection signal, the effective value of the A, B, and C phase voltages is displayed on the display module.

Figure 3 includes a current detection module, which collects the A, B, and C phase currents at the outlets of the circuit breaker, and outputs current detection signals after being processed by current transformers and operational amplifiers; the control module is coupled to the current detection module for receiving current detection signals, It is also coupled to the display module, and displays the amplitudes of A, B, and C phase currents on the display module according to the current detection signal, and controls the electronic release to disconnect the circuit breaker.

Figure 4 includes a zero-sequence current detection module, which collects the zero-sequence current at the outlet end of the circuit breaker, and outputs a zero-sequence current detection signal after being processed by a current transformer and an operational amplifier; the control module is coupled to the zero-sequence current detection module for receiving zero-sequence The current detection signal is also coupled to the display module. According to the zero-sequence current detection signal, the display module displays the magnitude of the zero-sequence current and controls the electronic release to disconnect the circuit breaker.

Figure 1 and Figure 5 respectively control two electronic releases through two relays, thereby controlling two circuit breakers. Wherein, manual or automatic selection is made through a button connected to the control module, and, in the automatic selection mode, the control module selects one group of circuit breakers to connect to the voltage according to the voltage detection signal. The control module mentioned above is a single-chip microcomputer circuit, and the display module is a display screen.

Example 2:

In the embodiment shown in Fig. 6, a kind of bypass operation low-voltage rapid switching detection method comprises the following steps:

Collect the A, B, and C phase voltages of Embodiment 1, respectively process the A, B, and C phase voltages, and obtain the phase voltage detection step 41 of the effective phase voltage display value;

According to the effective value of the A, B, C phase voltage, the voltage is automatically connected to the voltage or manually connected to the voltage into step 42;

Collect the A, B, and C phase currents formed after the A, B, and C phase voltages of Embodiment 1 are connected, respectively process the A, B, and C phase currents, and obtain the effective phase current amplitude display of Embodiment 1 value phase current detection step 43;

Collect the zero-sequence phase current formed after the A, B, and C phase voltages of Embodiment 1 are connected, process the zero-sequence current, and obtain the zero-sequence current detection step 44 of the effective zero-sequence current amplitude display value of Embodiment 1 ;

The phase current comparison detection step is based on the comparison between the phase current amplitude and the set rated phase current reference value, and the zero sequence current ratio is compared based on the zero sequence current amplitude and the set rated zero sequence current reference value Step 45 for detection. By adopting the above-mentioned technical scheme, the operator can know the information of real-time voltage, real-time current and real-time residual current when operating on site, and the live working monitoring method of the transmission line also includes the functions of current tracking protection and residual current tracking protection, Can improve security.

Example 3:

In the embodiment shown in FIG. 7 , a low-voltage fast switching tripping method for bypass operation includes the following steps:

The rated current setting step 51 of setting multiple rated phase current reference values and multiple rated zero-sequence current reference values, each reference value represents the rated phase current or rated zero-sequence current of Embodiment 1 with different multiples;

Step 52 for setting the disengagement time corresponding to multiple rated phase current reference values and multiple rated zero-sequence current reference values; the disconnection time value follows the rated zero-sequence current reference value or rated zero-sequence current decrease with an increase in the reference value;

Comparing the phase current detection signal obtained through detection with the set rated phase current reference value, and judging whether to control the tripping step 53 in which the electronic trip unit of Embodiment 1 disconnects the circuit breaker;

Comparing the detected zero-sequence current detection signal with the set rated zero-sequence current reference value, it is judged whether to control the tripping step 54 of the electronic trip device of Embodiment 1 to disconnect the circuit breaker.

The rated phase current reference value and the rated zero-sequence current reference value are respectively configured as 5, and the 5 rated phase current reference values represent 1.05 times the rated current, 1.3 times the rated current, 1.5 times the rated current, and 1.8 times the rated current current and 2 times the rated current; if the detected phase current amplitude is 1.05 to 1.3 times the rated current, do not disconnect the phase current front stage circuit; if the detected phase current amplitude is 1.3 to 1.5 times the rated current, disconnect The time required for the phase current pre-stage circuit is 2200s; if the detected phase current amplitude is 1.5 to 1.8 times the rated current, the time required to disconnect the phase current pre-stage circuit is 1500s; if the detected phase current amplitude At 1.8 to 2 times the rated current, the time required to disconnect the preceding circuit of the phase current is 800s; if the detected phase current amplitude is greater than 2 times the rated current, the time required to disconnect the preceding circuit of the phase current is 300s.

Example 4:

In the embodiment shown in FIG. 8 , a low-voltage fast switching display method for bypass operation includes a zero-sequence current reference value setting step 71 of setting a plurality of rated zero-sequence current reference values of embodiment 1, and each reference value is respectively Represents the rated zero-sequence current of Example 1 with different multiples; compare the zero-sequence current amplitude with multiple rated zero-sequence current reference values, and each time the zero-sequence current amplitude is greater than a reference value, the zero-sequence current reference value is displayed. Sequence current reference value display step 72; the zero-sequence current reference value configuration is 5, respectively 50mA, 100mA, 200mA, 300mA and 500mA; the zero-sequence current amplitude is 50mA-100mA, and the zero-sequence current is 50mA; if If the zero-sequence current amplitude is 100mA～200mA, the display zero-sequence current is 100mA; if the zero-sequence current amplitude is 200mA-300mA, the display zero-sequence current is 200mA; if the zero-sequence current amplitude is 300mA-500mA, the display zero-sequence current is 300mA ; If the zero-sequence current amplitude is greater than 500mA, the display zero-sequence current is 500mA. Set clear danger alarm parameter display points, the greater the danger, the greater the displayed data information; and while setting these different display points, also set different sound alarms for each corresponding display point, the greater the danger, the higher the sound alarm The higher the frequency, the clearer and more effective the early warning effect will be, to a greater extent, preventing insufficient safety protection or non-disconnection that may be caused by one disconnection, and to a greater extent improving the multiple safety protection functions of the maintenance and construction site. Limit the control to avoid safety hazards and accidents in on-site maintenance operations.

The above content and structure have described the basic principles, main features and advantages of the present invention, which should be understood by those skilled in the art. What described in above-mentioned example and specification sheet just illustrates the principle of the present invention, under the premise of not departing from the spirit and scope of the present invention, the present invention also can have various changes and improvements, and these changes and improvements all belong to the claimed scope of the present invention Inside. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. a kind of bypass operation low pressure quick switching device, is built in Live working Aerial Device, it is characterised in that：Including voltage detecting mould Block, current detection module, zero-sequence current detection module, control module, display module, chopper and electronic trip unit；Chopper Located at three-phase voltage outlet side, chopper is individually disconnected by the control of corresponding electronic trip unit, and voltage detection module collection is disconnected A, B, C phase voltage of road device leading-out terminal, the voltage sense signal after voltage transformer and operational amplifier are processed；Electric current A, B, C phase current at detection module collection breaker outgoing line end, the output current after current transformer, operational amplifier process Detection signal；The zero-sequence current at zero-sequence current detection module collection breaker outgoing line end, through current transformer and operation amplifier Zero-sequence current detection signal is exported after device process；Control module is coupled to voltage detection module, current detection module and zero sequence electricity Stream detection module, for receiving voltage detection signal, current detection signal and zero-sequence current detection signal；Control module is coupled to Display module, shows A, B, C phase voltage at breaker outgoing line end in display module according to voltage detection signal, examines according to electric current The phase current width that survey signal shows the amplitude of A, B, C phase current at breaker outgoing line end in display module and obtained according to detection Value judges that chopper is disconnected by control electronic trip unit, shows zero-sequence current according to zero-sequence current detection signal in display module Amplitude and judge that chopper is disconnected by control electronic trip unit according to the zero-sequence current amplitude that obtains of detection.

2. according to the bypass operation low pressure quick switching device described in claim 1, it is characterised in that：In described control module Portion is provided with the specified phase-current reference value and its corresponding value turn-off time of multiple different multiples, turn-off time value follow it is specified The increase of phase-current reference value and reduce, control module is specified mutually electric with setting according to the phase current sensing signal that detection is obtained The comparison result of stream reference value, judges whether that controlling electronic trip unit disconnects chopper.

3. according to the bypass operation low pressure quick switching device described in claim 1, it is characterised in that：In described control module Portion is provided with the specified zero-sequence current reference value and its corresponding value turn-off time of multiple different multiples, and turn-off time, value followed volume Determine the increase of zero-sequence current reference value and reduce, control module is according to detection the zero-sequence current detection signal for obtaining and the volume for setting Determine the comparison result of zero-sequence current reference value, judge whether that controlling electronic trip unit disconnects chopper.

4. according to the bypass operation low pressure quick switching device described in claim 1, it is characterised in that：Also include selecting module, Using the chopper of two groups of different capacity models, selecting module selects the chopper of two groups of different models to carry out manually or automatically Voltage is accessed, in pattern is automatically selected, control module selects one of which chopper to access voltage according to voltage detection signal.

5. according to the bypass operation low pressure quick switching device described in claim 1 or 2 or 3, it is characterised in that：Described electronics Electrical apparatus release includes audion, relay and electrical apparatus release plug connector, and transistor base Access Control module, transistor collector are electrically connected Connect normally opened relay coil, normally opened relay contact two ends electrical connection electrical apparatus release connector.

6. a kind of bypass operation low pressure quick switching device detection method, it is characterised in that：Comprise the steps

A, B, C phase voltage one of described in collection Claims 1 to 5, processes to A, B, C phase voltage respectively, obtains effective The phase-voltage measurement step of phase voltage show value；

Automatically the voltage is accessed or manually will according to the virtual value of A, B, C phase voltage one of described in Claims 1 to 5 The voltage that the voltage is accessed accesses step；

A, B, C phase voltage one of described in collection Claims 1 to 5 accessed after A, B, C phase current for being formed respectively, it is right respectively A, B, C phase current is processed, obtain Claims 1 to 5 described in one of effective phase current magnitude show value phase current inspection Survey step；

A, B, C phase voltage one of described in collection Claims 1 to 5 accessed after the zero sequence phase current that formed, to zero-sequence current Processed, obtain Claims 1 to 5 described in one of effective zero-sequence current amplitude show value zero-sequence current detecting step.

7. according to the bypass operation low pressure quick switching device detection method described in claim 6, it is characterised in that：Including foundation The phase current Determination step that phase current magnitude is compared with the specified phase-current reference value for setting, and according to zero-sequence current The zero-sequence current Determination step that amplitude is compared with the specified zero-sequence current reference value for setting.

8. a kind of bypass operation low pressure quick switching device tripping method, it is characterised in that：Comprise the steps

The rated current setting procedure of multiple specified phase-current reference values and multiple specified zero-sequence current reference values is set, it is each to refer to Specified phase current or specified zero-sequence current that value one of is represented described in different multiples Claims 1 to 5 respectively；

Set multiple specified phase-current reference values and multiple specified zero-sequence current reference values each self-corresponding disengagement time it is de- ETAD expected time of arrival and departure setting procedure；Value followed the increase of specified zero-sequence current reference value or specified zero-sequence current reference value and subtracted turn-off time It is few；

The phase current sensing signal that detection is obtained and the comparison result of the specified phase-current reference value of setting, judge whether control The dropout step that chopper is disconnected by electronic trip unit one of described in Claims 1 to 5；

The zero-sequence current detection signal that detection is obtained and the comparison result of the specified zero-sequence current reference value of setting, judge whether Electronic trip unit dropout step that chopper is disconnected one of described in control claim 1～5.

9. according to the bypass operation low pressure quick switching device tripping method described in claim 8, it is characterised in that：Specified mutually electricity Stream reference value and specified zero-sequence current reference value are respectively configured as 5, and 5 specified phase-current reference values represent 1.05 times respectively Rated current, 1.3 times of rated current, 1.5 times of rated current, the rated current of 1.8 times of rated current and 2 times；If The phase current magnitude that detection is obtained does not turn off phase current front stage circuits in 1.05～1.3 times of rated current；If the phase that detection is obtained In 1.3～1.5 times of rated current, the time needed for phase current front stage circuits that disconnects is 2200s to current amplitude；What if detection was obtained In 1.5～1.8 times of rated current, the time needed for phase current front stage circuits that disconnects is 1500s to phase current magnitude；If detection is obtained Phase current magnitude in 1.8～2 times of rated current, the time needed for phase current front stage circuits that disconnects is 800s；If detection is obtained Phase current magnitude be more than 2 times of rated current, disconnect phase current front stage circuits needed for time be 300s.

10. a kind of bypass operation low pressure quick switching device display packing, it is characterised in that：Including the multiple claim 1 of setting The zero-sequence current reference value setting procedure of the specified zero-sequence current reference value one of described in～5, each reference value represent difference respectively Specified zero-sequence current one of described in multiple Claims 1 to 5；By zero-sequence current amplitude and multiple specified zero-sequence current reference values Compare, zero-sequence current amplitude is often more than a reference value, show that the zero-sequence current reference value of the zero-sequence current reference value shows step Suddenly；The zero-sequence current reference value is configured to 5, respectively 50mA, 100mA, 200mA, 300mA and 500mA；Zero-sequence current width In 50mA～100mA, display zero-sequence current is 50mA to value；If zero-sequence current amplitude is in 100mA～200mA, zero-sequence current is shown For 100mA；If zero-sequence current amplitude 200mA～300mA, display zero-sequence current is 200mA；If zero-sequence current amplitude 300mA ～500mA, display zero-sequence current are 300mA；If zero-sequence current amplitude is more than 500mA, display zero-sequence current is 500mA.