CN114156844B - In-situ coincident feeder line automatic protection device with residual voltage locking function - Google Patents
In-situ coincident feeder line automatic protection device with residual voltage locking function Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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Abstract
The invention relates to an on-site coincident feeder automation protection device with a residual voltage locking function, which comprises a feeder automation protection device and a residual voltage detection circuit, wherein the residual voltage detection circuit is arranged on the protection device through an on-board mode or an integrated mode, and a residual voltage locking control module and an on-site coincident fault isolation module are arranged in a processor of the protection device; the residual voltage detection circuit is based on a low-power-consumption trigger and comprises a power supply isolation acquisition circuit, a rectifying circuit, a pulse generating circuit, a trigger circuit and a latch circuit which are electrically connected in sequence; the residual voltage locking control module realizes corresponding operation control, if the residual voltage is not instantaneous residual voltage, the residual voltage locking function is not started, and if the residual voltage is a residual voltage signal, the residual voltage locking function is started; the in-situ coincident fault isolation module realizes fault isolation of the in-situ coincident feeder automation protection device. The invention reduces the reclosing times under the traditional method, impact on load and equipment and prolongs the service life of the equipment and the switch.
Description
Technical Field
The invention belongs to the technical field of power grid feeder automation, and relates to an in-situ coincident feeder automation protection device with a software and hardware residual voltage locking function.
Background
With the development of economy, the current requirements for the stability of the power grid are increasing. At present, an on-site coincident or centralized feeder automation protection device is commonly adopted, and is mainly divided into three protection modes of voltage time type, voltage current counting type and self-adaptive comprehensive type, wherein the three modes are all based on a coincident principle to realize fault positioning and isolation. Based on reclosing feeder automation protection device, need rely on transformer substation switching device, 10kV post on-column switch's multiple reclosure realization, to segmentation and tie switch, if do not possess the function of software and hardware residual voltage shutting, can lead to the line to realize fault isolation just by multiple reclosure, the increase of reclosure number of times is to the impact of electric wire netting load and equipment, probably can influence the life-span of equipment and switch.
In addition, at present, a scheme of a magnetic latching relay is mostly adopted for residual voltage detection, and the scheme can be used for correctly identifying after the action condition of the magnetic latching relay is reached by supplying power through instantaneous residual voltage under the condition of no backup power supply. This approach is difficult to detect and identify for transient short bursts (less than 80 ms), thereby reducing the identification reliability of transient residual pressure detection.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an on-site overlapped feeder automation protection device with a software and hardware residual voltage locking function, which overcomes the problems and defects in the prior art. The technical scheme adopted by the invention is as follows:
an in-situ coincident feeder automation protection device with residual voltage locking function, comprising: the device comprises a feeder automation protection device with a processor and a residual voltage detection circuit, wherein the residual voltage detection circuit is arranged on the feeder automation protection device through an on-board mode or an integrated mode, and a residual voltage locking control module and an on-site superposition fault isolation module are arranged in the processor of the feeder automation protection device;
the residual voltage detection circuit is based on a low-power-consumption trigger and comprises: the power supply isolation acquisition circuit, the rectifying circuit, the pulse generating circuit, the trigger circuit and the latch circuit are electrically connected in sequence;
the residual voltage locking control module realizes corresponding operation control, if the residual voltage is not instantaneous residual voltage but normal incoming call, the residual voltage locking function is not started, and if the residual voltage is a residual voltage signal, the residual voltage locking function is started;
the on-site coincident fault isolation module controls the on-site coincident feeder automation protection device to realize fault isolation based on the software and hardware residual voltage detection function.
The invention has the beneficial effects that:
the invention provides an on-site reclosing feeder automation protection device with a software and hardware residual voltage locking function, which can finish fault isolation by 2-3 reclosings based on-site reclosing of a transformer substation and the feeder automation protection device under normal conditions, reduces the times of reclosing under the traditional method, reduces the impact on load and equipment, and improves the service life of the equipment and a switch.
The invention adopts the residual voltage detection circuit based on the low-power-consumption trigger, and under the condition of no backup power supply, the instantaneous residual voltage can be accurately identified only by the rising edge trigger signal, and the instantaneous residual voltage pulse smaller than 80ms can be accurately identified. Meanwhile, a low-power-consumption trigger is adopted, and the whole service life is far beyond the technical standard requirement. Besides the function of hardware residual voltage detection, the device has the function of software residual voltage locking. By means of the soft and hardware residual voltage locking function, after the power supply side or the load side of the sectionalized and interconnection switch fails, the feeder automation protection device based on the on-site superposition type can effectively identify fault points and lock the corresponding switch, and impact caused by repeated reclosing is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the following description will briefly explain the drawings used in the description of the embodiments and the prior art. It is apparent that the drawings in the following description are specific embodiments of the invention and that other drawings within the scope of the application can be obtained from these drawings by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a residual voltage detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a residual voltage lock control module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power grid connection structure according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a voltage-time-type reclosing fault isolation process according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and complete in conjunction with the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the present invention.
The invention designs an on-site coincident feeder automation protection device with a software and hardware residual voltage locking function, which comprises: the residual voltage detection circuit is installed on the feeder automation protection device through an on-board mode or an integrated mode, the residual voltage detection circuit is reliably connected with the feeder automation protection device through a pin header in the on-board mode, and the residual voltage detection circuit is directly integrated into an acquisition module of the feeder automation protection device in the integrated mode. The processor of the feeder automation protection device is provided with a residual voltage locking control module and an on-site coincident fault isolation module, and the protection function of feeder automation is realized through a software program processing module.
Fig. 1 is a schematic diagram of a residual voltage detection circuit according to an embodiment of the invention. The residual voltage locking in a hardware mode is mainly aimed at the condition of no backup power supply, and a residual voltage detection circuit based on a low-power-consumption trigger is designed. Under the condition of no backup power supply, the power-on is initialized to acquire the hardware residual voltage state, so that the locking function is realized. The residual voltage detection circuit is based on a low-power-consumption trigger and mainly comprises: the power supply isolation acquisition circuit, the rectifying circuit, the pulse generating circuit, the trigger circuit and the latch circuit are electrically connected in sequence. As shown in fig. 1, taking the detection of the residual voltage at the single-path power supply side or the load side as an example, the power supply isolation acquisition circuit is realized by adopting one path of PT, and the residual voltages at the power supply side and the load side are respectively acquired, wherein the PT transformation ratio is 200V/7.07V. The power supply isolation acquisition circuit is connected with the rectification circuit at the rear stage, the rectification circuit is composed of four discrete diodes, and negative half-cycle signals can be rectified into positive half-cycle signals through the rectification circuit, so that the identification time of residual voltage pulses is further improved, and reliable identification is guaranteed. The rectifying circuit is connected with the pulse generating circuit at the rear stage, the input of the pulse generating circuit is rectified voltage, and the rectified voltage is divided by the resistors 2R6 and 2R7 to be used as the voltage critical value of the pulse generating circuit. The 2D3 adopts a TL431 voltage stabilizing chip, and when the voltage value of the input voltage after being divided is larger than the reference voltage of the reference chip, positive pulse is output; when the voltage value of the input voltage after being divided is smaller than the reference voltage of the reference chip, no pulse is output. Therefore, the pulse can be reliably identified through 1 cycle at most, and the time of 1 cycle is 20ms, so that compared with the traditional magnetic latching relay, the residual voltage pulse identification reliability is greatly improved, and the residual voltage pulse identification time is shortened. The latch circuit of the pulse generation circuit rear-stage contact generator 2U8 latches and memorizes the residual voltage pulse signal. As shown in fig. 1, the signal of the pulse generating circuit is connected to the CLK pin of the trigger 2U8, and the D trigger signal and the PRE signal are externally connected to the VCC enable signal, so as to form a trigger circuit. The trigger 2U8 is a low-power consumption single-path positive edge trigger type D-type trigger, has the characteristic of low power consumption compared with the maximum advantage of the traditional scheme, has the power supply voltage as low as 0.8V, and has the overall working current of about 0.9uA through actual measurement. Under the condition of no backup power supply, a CR1632 button battery with the voltage of 3V and the battery capacity of 137mAh is adopted, and the whole working time can reach 137000/0.9=15222 hours (namely 17 years) through calculation, thereby completely meeting the requirements of the service life on site. The output Q of the trigger is used as an output pin, the main chip of the feeder automation protection device is electrified to instantly collect residual voltage signals, and meanwhile, the main chip of the feeder automation protection device outputs and clears the latch state of the trigger through the pulse control CLR pin. The power supply isolation acquisition circuit, the rectifying circuit, the pulse generation circuit, the latch circuit and the like are all in two-way configuration, and two residual voltage pulses on the power supply side and the load side are acquired.
The residual voltage locking control module is based on the residual voltage locking control module to realize the residual voltage locking of a software mode, and is mainly used under the condition of a backup power supply, and the feeder line automatic protection device distinguishes whether the residual voltage is instantaneous or not by collecting the voltages of the power supply side and the load side. The corresponding operation control is realized through the residual voltage locking control module, if the residual voltage is not instantaneous residual voltage but is in a normal incoming call condition, the residual voltage locking function is not started, and if the residual voltage is a residual voltage signal, the residual voltage locking function is started. Fig. 2 is a schematic workflow diagram of a residual voltage locking control module according to an embodiment of the invention. The residual voltage locking control module has the following specific working processes:
(1) After the pulse signal is generated, the residual voltage detection circuit identifies whether the pulse signal is a residual voltage signal, if so, the Q pin of the trigger 2U8 is triggered to output a low-level signal, and if not, the Q pin outputs a high-level signal.
(2) The device has the function of detecting the residual voltage at the power supply side and the load side. If a residual voltage is generated for the power supply side, the D1 pin output of the flip-flop 2U8 is latched. If residual voltage is generated for the load side, the D2 pin output of the flip-flop 2U8 is latched.
(3) If the residual voltage is the power supply side residual voltage, starting the feeder line automatic protection device after the power on the load side is normally electrified, acquiring the residual voltage state and judging whether the residual voltage is the residual voltage or not; if residual voltage occurs on the load side, after the power supply side is powered on normally, the feeder line automatic protection device is started, the residual voltage state is obtained, and whether the residual voltage is judged.
(4) If residual voltage occurs, the reverse residual voltage closing, i.e., reverse closing, is recorded and performed regardless of the power source side or the load side. If no residual voltage occurs, the residual voltage record state of the trigger is cleared through the CLR pin, the normal residual voltage detection function of the next time is entered, and meanwhile, reverse residual voltage locking is not implemented.
(5) Through the steps, the function of reverse residual voltage locking is realized, fault isolation and positioning can be rapidly and effectively realized, and repeated reclosing is avoided.
And the on-site coincident feeder line automatic protection device is controlled to realize fault isolation based on the software and hardware residual voltage detection function through the on-site coincident fault isolation module. Fig. 3 is a schematic diagram of a power grid connection structure according to an embodiment of the present invention; fig. 4 is a schematic diagram of a voltage-time type reclosing fault isolation step according to an embodiment of the present invention. The method for controlling the automatic protection device to realize fault isolation by taking the voltage time-based protection mode as an example is as follows:
CB1 is a line 1 transformer substation outgoing line breaker, F001-F003 are sectional switches, interconnection L1 is an interconnection switch, and all the outgoing line breakers, the sectional switches and the interconnection switches are breaker equipment controlled by a feeder automation protection device. The voltage time type superposition fault isolation steps are as follows:
(a) Assuming that a grounding or interphase short circuit fault occurs between F002 and F003, after the time of superposition, CB1 trips for the first time, voltage time is realized based on the principle that incoming calls are switched on and released in a pressureless way, F001-F002 is switched on sequentially through X time, and the X time is the delay time of switching on a circuit breaker when the incoming call is on one side of the circuit breaker;
(b) When F002 is switched on, if the permanent fault exists, the fault exists after the switching on, and the sectionalized switch F003 detects a residual voltage signal at the moment, and the load side is blocked to be electrically switched on. Meanwhile, because single-side voltage loss occurs in Y time, F002 is locked out of the power supply side to be switched on in the forward direction, and Y time is the fault detection time after the circuit breaker is switched on;
(c) Meanwhile, because interphase short circuit occurs, the CB1 trips for the second time, after reclosing time, the CB1 recloses for the second time, F001 is electrified to reclose, and F002 is not reclosed due to forward locking. And F003, closing the load side by closing the residual voltage. The circuit breaker is closed after the single-side voltage loss XL of the interconnection switch L1 is closed, and the F003 is closed, wherein the XL time is closing delay time when the single-side voltage loss of the interconnection switch breaker occurs;
(d) And finally, F002 and F003 are not switched on, and the faults between F002 and F003 are isolated through secondary reclosing, so that fault isolation processing is realized. The closing is that the circuit breaker is closed, the locking closing is that the circuit breaker is not closed, the forward locking closing is that the forward incoming call locking closing, and the reverse locking closing is that the reverse incoming call locking closing.
Compared with the traditional mode, fault isolation is realized through a reclosing mode, impact on switch equipment and load is effectively reduced, and the service life of the equipment is prolonged. The voltage-current counting type and self-adaptive comprehensive protection mode is basically similar to the voltage-time type, but the functions of current counting and fault memorizing are added on the basis of the prior art, so the method is also applicable.
In a word, the on-site coincident feeder automation protection device with software and hardware residual voltage detection is provided, compared with the traditional on-site feeder automation protection device, the function of residual voltage detection can be accurately realized in one cycle under the condition of the existence of a backup power supply, the detection is reliable, the occurrence of missing detection and false detection is avoided, and the residual voltage pulse width detection time is reduced; compared with the traditional scheme, the method has the advantages of low power consumption and is far more than the requirements of the service life of the field. Compared with the traditional on-site coincident feeder automation protection device, the on-site coincident feeder automation protection device can effectively identify fault points and lock corresponding switches, and avoids impact caused by repeated reclosing.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that: any person skilled in the art may modify or easily conceive of changes to the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (4)
1. The utility model provides a have local coincidence formula feeder automation protection device of residual voltage shutting function which characterized in that includes: the device comprises a feeder automation protection device with a processor and a residual voltage detection circuit, wherein the residual voltage detection circuit is arranged on the feeder automation protection device through an on-board mode or an integrated mode, and a residual voltage locking control module and an on-site superposition fault isolation module are arranged in the processor of the feeder automation protection device;
the residual voltage detection circuit is based on a low-power-consumption trigger and comprises: the power supply isolation acquisition circuit, the rectifying circuit, the pulse generating circuit, the trigger circuit and the latch circuit are electrically connected in sequence;
the residual voltage locking control module realizes corresponding operation control, if the residual voltage is not instantaneous residual voltage but normal incoming call, the residual voltage locking function is not started, and if the residual voltage is a residual voltage signal, the residual voltage locking function is started;
the on-site coincident fault isolation module is used for controlling the on-site coincident feeder automation protection device to realize fault isolation based on the software and hardware residual voltage detection function;
the residual voltage detection circuit is used for detecting residual voltage at a single power supply side or a load side, and the power supply isolation acquisition circuit adopts a PT (potential transformer) path to respectively acquire residual voltages at the power supply side and the load side; the power supply isolation acquisition circuit is connected with a rectifying circuit at the rear stage, the rectifying circuit consists of four discrete diodes, and a negative half-cycle signal is rectified into a positive half-cycle signal through the rectifying circuit; the rear stage of the rectifying circuit is connected with a pulse generating circuit, the input of the pulse generating circuit is rectified voltage, and the rectified voltage is divided by resistors 2R6 and 2R7 and then is used as a voltage critical value of the pulse generating circuit; the latch circuit of the post-stage contact generator 2U8 of the pulse generating circuit latches and memorizes the residual voltage pulse signal; the signal of the pulse generating circuit is connected with the CLK pin of the trigger 2U8, and the D trigger signal and the PRE signal are externally connected with the VCC enabling signal to form a trigger circuit;
the residual voltage locking control module has the following specific working processes:
(1) After the pulse signal is generated, identifying whether the pulse signal is a residual voltage signal or not through a residual voltage detection circuit, if so, triggering a Q pin of a trigger 2U8 to output a low-level signal, otherwise, outputting a high-level signal through the Q pin;
(2) If the residual voltage is generated for the power supply side, the D1 pin output of the trigger 2U8 is latched, and if the residual voltage is generated for the load side, the D2 pin output of the trigger 2U8 is latched;
(3) If the residual voltage is the power supply side residual voltage, starting the feeder line automatic protection device after the power on the load side is normally electrified, acquiring the residual voltage state and judging whether the residual voltage is the residual voltage or not; if residual voltage occurs on the load side, after the power supply side is powered on normally, the feeder line automatic protection device is started, the residual voltage state is obtained, and whether the residual voltage is judged;
(4) And if residual voltage does not occur, the residual voltage recording state of the trigger is cleared through the CLR pin, the next normal residual voltage detection function is entered, and meanwhile, the reverse residual voltage blocking is not implemented.
2. The in-situ coincident feeder automation protector with residual voltage locking function as claimed in claim 1, wherein the power supply isolation acquisition circuit, the rectifying circuit, the pulse generating circuit and the latch circuit are all configured in two paths, and acquire two residual voltage pulses on the power supply side and the load side.
3. The in-situ coincident feeder automation protector with residual voltage locking function as claimed in claim 1, wherein the in-situ coincident fault isolation module is based on a voltage time protection mode, and the method for controlling the automation protector to realize fault isolation is as follows:
CB1 is a line 1 transformer substation outlet circuit breaker, F001-F003 are sectional switches, interconnection L1 is an interconnection switch, and voltage time type superposition fault isolation steps are as follows:
(a) Assuming that a grounding or interphase short circuit fault occurs between F002 and F003, after the time of superposition, CB1 trips for the first time, voltage time is realized based on the principle that incoming calls are switched on and released in a pressureless way, F001-F002 is switched on sequentially through X time, and the X time is the delay time of switching on a circuit breaker when the incoming call is on one side of the circuit breaker;
(b) When F002 is switched on, if the permanent fault exists after the switching on, the sectional switch F003 can detect residual voltage signals at the moment to block the incoming call switching on of the load side, meanwhile, because single-side voltage loss occurs in Y time, F002 blocks the forward switching on of the power supply side, and Y time is the fault detection time after the switching on of the circuit breaker;
(c) Meanwhile, because interphase short circuit occurs, the CB1 trips for the second time, after the reclosing time, the CB1 recloses for the second time, F001 is electrified and recloses, and F002 is not reclosed due to forward locking; f003 is closed due to residual voltage locking, namely closing is performed after the single-side voltage-losing XL time of the contact switch L1 is closed, and F003 is closed, wherein the XL time is closing delay time when the single-side voltage-losing of the contact switch breaker is performed;
(d) Finally, F002 and F003 are not switched on, and faults between F002 and F003 are isolated through secondary reclosing, so that fault isolation treatment is realized; the closing is that the circuit breaker is closed, the locking closing is that the circuit breaker is not closed, the forward locking closing is that the forward incoming call locking closing, and the reverse locking closing is that the reverse incoming call locking closing.
4. The in-situ coincident feeder automation protector with residual voltage locking function according to any one of claims 1-3, wherein the residual voltage detection circuit is reliably connected with the feeder automation protector through a pin header in an on-board mode, and the residual voltage detection circuit is directly integrated into an acquisition module of the feeder automation protector in an integrated mode.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746353A (en) * | 2013-12-31 | 2014-04-23 | 宏秀电气有限公司 | Self-healing control system of intelligent distribution network and working method thereof |
| CN110635459A (en) * | 2019-10-17 | 2019-12-31 | 广西电网有限责任公司南宁供电局 | Double-path check residual voltage locking method and circuit |
| CN211505687U (en) * | 2019-11-06 | 2020-09-15 | 珠海思创智能电网技术有限公司 | Residual voltage memory circuit and residual voltage detection device |
| CN113381389A (en) * | 2021-01-19 | 2021-09-10 | 佳源科技股份有限公司 | Self-adaptive comprehensive distributed feeder automation method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103746353A (en) * | 2013-12-31 | 2014-04-23 | 宏秀电气有限公司 | Self-healing control system of intelligent distribution network and working method thereof |
| CN110635459A (en) * | 2019-10-17 | 2019-12-31 | 广西电网有限责任公司南宁供电局 | Double-path check residual voltage locking method and circuit |
| CN211505687U (en) * | 2019-11-06 | 2020-09-15 | 珠海思创智能电网技术有限公司 | Residual voltage memory circuit and residual voltage detection device |
| CN113381389A (en) * | 2021-01-19 | 2021-09-10 | 佳源科技股份有限公司 | Self-adaptive comprehensive distributed feeder automation method |
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