CN114156844A - On-site reclosing type feeder automatic protection device with residual voltage locking function - Google Patents
On-site reclosing type feeder 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 in-situ reclosing type feeder automatic protection device with a residual voltage locking function, which comprises a feeder automatic protection device and a residual voltage detection circuit, wherein the residual voltage detection circuit is arranged on the protection device in an onboard mode or an integrated mode, and a residual voltage locking control module and an in-situ reclosing type 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 rectification circuit, a pulse generation 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 on-site reclosing type fault isolation module realizes fault isolation of the on-site reclosing type feeder automation protection device. The invention reduces the reclosing times and the impact on the load and the equipment in the traditional method, and prolongs the service life of the equipment and the switch.
Description
Technical Field
The invention belongs to the technical field of feeder automation of a power grid, and relates to an on-site reclosing feeder automation protection device with a software and hardware residual voltage locking function.
Background
With the development of economy, the requirement on the stability of the power grid is higher and higher at present. At present, an in-situ overlapping or centralized feeder automatic protection device is commonly adopted, and the in-situ overlapping or centralized feeder automatic protection device is mainly divided into three protection modes, namely a voltage time type protection mode, a voltage and current metering mode and a self-adaptive comprehensive protection mode, wherein the three protection modes realize fault positioning and isolation based on an overlapping principle. Feeder automation protection device based on reclosing type needs to rely on transformer substation switching device, 10kV column switch's multiple reclosing to realize, to segmentation and interconnection switch, if do not possess software and hardware residual voltage shutting function, will lead to circuit multiple reclosing to realize fault isolation, and the increase of reclosing number of times is to the impact of electric wire netting load and equipment, probably influences the life-span of equipment and switch.
In addition, most of the existing schemes for detecting residual voltage adopt a magnetic latching relay, and under the condition of no standby power supply, the scheme needs to supply power through instantaneous residual voltage, so that the residual voltage can be correctly identified after the action condition of the magnetic latching relay is reached. This approach is difficult to detect and identify for transient short pulses (less than 80ms), thereby reducing the identification reliability of transient residual voltage detection.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an on-site reclosing type feeder automatic protection device with a software and hardware residual voltage locking function, which overcomes the problems and the defects in the prior art. The technical scheme adopted by the invention is as follows:
an automatic protection device of a reclosing feeder with residual voltage locking function comprises: the device comprises a feeder line automatic protection device with a processor and a residual voltage detection circuit, wherein the residual voltage detection circuit is installed on the feeder line automatic protection device through an onboard mode or an integrated mode, and a residual voltage lock control module and an in-situ coincident type fault isolation module are arranged in the processor of the feeder line automatic 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 generation 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 reclosing type fault isolation module controls the on-site reclosing type feeder automatic 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 in-situ reclosing type feeder line automatic protection device with a software and hardware residual voltage locking function, under a normal condition, fault isolation can be completed by a transformer substation and the feeder line automatic protection device through 2-3 reclosing operations based on in-situ reclosing type fault isolation, the reclosing times under the traditional method are reduced, impact on loads and equipment is reduced, and the service lives of the equipment and a switch are prolonged.
The invention adopts a residual voltage detection circuit based on a low-power-consumption trigger, can correctly identify the instantaneous residual voltage only by a rising edge trigger signal under the condition of no standby power supply, and can still accurately identify the instantaneous residual voltage pulse less than 80 ms. Meanwhile, a low-power-consumption trigger is adopted, and the whole working life is far beyond the technical standard requirement. Besides the function of detecting the hardware residual voltage, the device has the function of locking the software residual voltage. Through software and hardware residual voltage blocking function, after the power source side or the load side of the segmentation and interconnection switch breaks down, based on the on-site reclosing type feeder automation protection device, the fault point can be effectively identified, the corresponding switch can be blocked, and the impact caused by multiple 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 drawings used in the description of the embodiments and the prior art will be briefly described below. It should be apparent that the drawings in the following description are specific embodiments of the invention, and that other drawings within the scope of the present application can be obtained 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 view of a work flow of a residual pressure 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 reclosing type fault isolation procedure according to an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
The invention designs an in-situ reclosing feeder automatic protection device with software and hardware residual voltage locking function, which comprises: take feeder automation protection device and residual voltage detection circuitry of treater, residual voltage detection circuitry install on feeder automation protection device through board year mode or integrated mode, residual voltage detection circuitry carries out reliable connection through row needle and feeder automation protection device under the board year mode, residual voltage detection circuitry is directly integrated to feeder automation protection device's collection module under the integrated mode. A processor of the feeder automation protection device is provided with a residual voltage lock control module and an on-site reclosing type fault isolation module, and the protection function of feeder automation is realized through a software program processing module.
Fig. 1 is a schematic structural diagram of a residual voltage detection circuit according to an embodiment of the present invention. The residual voltage locking in a hardware mode is mainly designed aiming at the condition without a backup power supply, and the residual voltage detection circuit based on the low-power-consumption trigger is realized by the scheme that a feeder line automatic protection device obtains a residual voltage signal through the residual voltage detection circuit. And under the condition of no standby power supply, initializing power-on to obtain the residual voltage state of the hardware, thereby realizing the locking function. The residual voltage detection circuit is based on a low-power consumption trigger and mainly comprises: the power supply isolation acquisition circuit, the rectification circuit, the pulse generation circuit, the trigger circuit and the latch circuit are electrically connected in sequence. As shown in fig. 1, for example, when the circuit is used for detecting the residual voltage on the single power supply side or the load side, the power supply isolation acquisition circuit is implemented by using a path of PT, and respectively acquires the residual voltages on the power supply side and the load side, and the PT transformation ratio is 200V/7.07V. The power supply isolation acquisition circuit is connected with a rectification circuit in a rear-stage mode, the rectification circuit is composed of four discrete diodes, negative half-cycle signals can be rectified into positive half-cycle signals through the rectification circuit, the identification time of residual voltage pulses is further prolonged, and reliable identification is guaranteed. The rectification circuit is connected with a pulse generating circuit in a post-stage mode, the input of the pulse generating circuit is rectified voltage, and the rectified voltage is divided by resistors 2R6 and 2R7 to be used as a voltage critical value of the pulse generating circuit. 2D3 adopts TL431 voltage-stabilizing chip, when the voltage value of the input voltage after voltage division is larger than the reference voltage of the reference chip, positive pulse is output; when the voltage value of the input voltage after voltage division is smaller than the reference voltage of the reference chip, no pulse is output. Therefore, the pulse can be reliably identified by 1 cycle at most, and the 1 cycle time is 20ms, so that compared with the traditional magnetic latching relay, the reliability of residual voltage pulse identification is greatly improved, and the time for identifying the residual voltage pulse is shortened. The latch circuit of the pulse generation circuit post-stage contact transmitter 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 flip-flop 2U8, and the D trigger signal and the PRE signal are externally connected to the VCC enable signal, thereby forming a flip-flop circuit. This trigger 2U8 chooses low-power consumption single channel positive edge trigger formula D type trigger for use, compares the biggest advantage with traditional scheme and possesses the characteristic of low-power consumption, and the supply voltage is low to 0.8V, and through actual measurement, the whole operating current of this chip and circuit is about 0.9 uA. Under the condition of no back-up power supply, a CR1632 button battery is adopted, the voltage is 3V, the battery capacity is 137mAh, the whole working time can reach 137000/0.9 which is 15222 hours (namely 17 years) through calculation, and the requirement of the field service life is completely met. The output Q of the trigger serves as an output pin, a 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 controls the CLR pin to output and clear the latching state of the trigger through pulses. The power supply isolation acquisition circuit, the rectifying circuit, the pulse generation circuit, the latch circuit and the like are all configured in two ways, and acquire two ways of residual voltage pulses on the power supply side and the load side.
Residual voltage locking based on a software mode is realized by a residual voltage locking control module, and whether the residual voltage locking is an instant residual voltage or not is distinguished mainly by collecting the voltage of a power supply side and the voltage of a load side aiming at the situation that a backup power supply exists. And realizing corresponding operation control through the residual voltage locking control module, if the residual voltage is not instantaneous residual voltage but normal incoming call, not starting the residual voltage locking function, and if the residual voltage is a residual voltage signal, starting the residual voltage locking function. Fig. 2 is a schematic diagram of a work flow of the residual pressure locking control module according to an embodiment of the present invention. The specific working process of the residual pressure lock control module is as follows:
(1) after the pulse signal is generated, whether the pulse signal is a residual voltage signal is identified through a residual voltage detection circuit, if so, a Q pin of the trigger 2U8 is triggered to output a low level signal, otherwise, the Q pin outputs a high level signal.
(2) The residual voltage detection function is provided on the power supply side and the load side. If a residual voltage is generated for the power supply side, the D1 pin output of flip-flop 2U8 will be latched. If a residual voltage is generated for the load side, the D2 pin output of flip-flop 2U8 will be latched.
(3) If the residual voltage is at the power supply side, after the incoming call at the load side is normally electrified, the feeder automatic protection device is started to obtain the residual voltage state and judge whether the residual voltage is at the load side; if the residual voltage occurs on the load side, after the power supply side is powered on normally, the feeder automatic protection device is started to obtain the residual voltage state and judge whether the residual voltage state is the residual voltage or not.
(4) Whether the power supply side or the load side is adopted, if residual voltage occurs, reverse residual voltage locking is recorded and implemented, namely reverse locking closing is carried out. If no residual voltage occurs, 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 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 quickly and effectively realized, and multiple reclosure is avoided.
Through the on-site reclosing type fault isolation module, on the basis of the software and hardware residual voltage detection function, the on-site reclosing type feeder automatic protection device is controlled to realize fault isolation. 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 reclosing type fault isolation procedure according to an embodiment of the present invention. The on-site reclosing type fault isolation module takes a voltage-based time type protection mode as an example, and a method for controlling an automatic protection device to realize fault isolation comprises the following steps:
CB1 is the circuit 1 transformer substation circuit breaker that is qualified for the next round of competitions, and F001-F003 are the section switch, and tie L1 is the tie switch, and all circuit breaker, section switch and the tie switch that are qualified for the next round of competitions are the circuit breaker equipment that feeder automation protection device controlled. The voltage time type reclosing fault isolation method comprises the following steps:
(a) assuming that grounding or interphase short circuit fault occurs between F002 and F003, CB1 trips for the first time, after coincidence time, voltage time type is realized based on the principle that incoming calls are immediately closed and no-voltage release is carried out, F001-F002 are sequentially closed in X time, and the X time is delay time of closing the circuit breaker when one side of the circuit breaker is in an incoming call;
(b) when F002 is switched on, if the fault is a permanent fault, the fault exists after the switch-on, and at the moment, the section switch F003 detects a residual voltage signal, and the load side is locked to be switched on. Meanwhile, because unilateral voltage loss occurs in Y time, the F002 locking power supply side is normally closed, and the Y time is the fault detection time after the breaker is closed;
(c) meanwhile, due to the fact that interphase short circuit occurs, the CB1 trips for the second time, after the reclosing time, the CB1 recloses for the second time, the power on of the F001 is coincided, and the closing of the F002 is not coincided due to forward locking. F003 is locked due to residual voltage, and the load side is locked to be electrically switched on. The contact switch L1 is closed after the time XL for single-side voltage loss, F003 is closed by locking, and the time XL is the time delay of closing when the circuit breaker for the contact switch is single-side power loss;
(d) and finally, the F002 and the F003 are not switched on, and the fault between the F002 and the F003 is isolated through secondary reclosing, so that the fault isolation treatment is realized. The closing is the closing of the circuit breaker, the closing of the circuit breaker is not allowed, the forward closing of the circuit breaker is the closing of the circuit breaker by the power supply, and the reverse closing of the circuit breaker is the closing of the circuit breaker by the power supply.
Compared with the traditional mode, the fault isolation is realized in a reclosing mode, the impact on the switching equipment and the load is effectively reduced, and the service life of the equipment is prolonged. The voltage current counting type and the self-adaptive comprehensive protection mode are basically similar to the voltage time type, and the functions of current counting and fault memory are added on the original basis, so that the method is also suitable.
In a word, compared with the traditional in-situ feeder automatic protection device, the in-situ superposed feeder automatic protection device with the software and hardware residual voltage detection function can accurately realize the residual voltage detection function in one cycle wave under the condition of the existence of a standby power supply, has reliable detection, avoids the occurrence of missed detection and false detection, and reduces the residual voltage pulse width detection time; compared with the traditional scheme, the method has the greatest advantage of low power consumption, and the requirement of the method is far higher than the requirement of field service life. Compared with the traditional automatic protection device for the on-site reclosing feeder, the automatic protection device for the feeder can effectively identify fault points and lock corresponding switches, and impact caused by multiple reclosing is avoided.
Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some 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 embodiments of the present invention, and they should be construed as being included therein.
Claims (6)
1. Overlapping formula feeder automation protection device on spot that possesses residual voltage blocking function, its characterized in that includes: the device comprises a feeder line automatic protection device with a processor and a residual voltage detection circuit, wherein the residual voltage detection circuit is installed on the feeder line automatic protection device through an onboard mode or an integrated mode, and a residual voltage lock control module and an in-situ coincident type fault isolation module are arranged in the processor of the feeder line automatic 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 generation 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 reclosing type fault isolation module controls the on-site reclosing type feeder automatic protection device to realize fault isolation based on the software and hardware residual voltage detection function.
2. The automatic on-site reclosing feeder protection device with residual voltage blocking function according to claim 1, wherein the residual voltage detection circuit is used for detecting residual voltage on a single power supply side or a load side, and the power supply isolation acquisition circuit adopts a PT to respectively acquire the residual voltage on the power supply side and the load side; the power supply isolation acquisition circuit is connected with a rectification circuit in a post-stage mode, the rectification circuit consists of four discrete diodes, and the rectification circuit is used for rectifying the negative half-cycle signal into a positive half-cycle signal; 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 the voltage critical value of the pulse generating circuit; the latch circuit of the pulse generating circuit rear-stage contact transmitter 2U8 latches and memorizes the residual voltage pulse signal; 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 enabling signal to form a trigger circuit.
3. The on-site reclosing feeder automation protection device with residual voltage lockout function of claim 2, wherein the power isolation acquisition circuit, the rectification circuit, the pulse generation circuit and the latch circuit are all configured in two ways, and acquire two ways of residual voltage pulses on the power source side and the load side.
4. The on-site reclosing feeder automation protection device with residual voltage lockout function of claim 1, wherein the residual voltage lockout control module works as follows:
(1) after the pulse signal is generated, whether the pulse signal is a residual voltage signal is identified through a residual voltage detection circuit, if so, a Q pin of a trigger 2U8 is triggered to output a low level signal, otherwise, the Q pin outputs a high level signal;
(2) if the residual voltage is generated for the power supply side, the D1 pin output of the flip-flop 2U8 is latched, and if the 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 at the power supply side, after the incoming call at the load side is normally electrified, the feeder automatic protection device is started to obtain the residual voltage state and judge whether the residual voltage is at the load side; if the residual voltage occurs on the load side, after the power supply side is powered on normally, the feeder automatic protection device is started to obtain the residual voltage state and judge whether the residual voltage state is the residual voltage;
(4) whether the power supply side or the load side is adopted, if residual voltage occurs, reverse residual voltage locking is recorded and implemented, namely reverse locking switching-on is carried out, if no residual voltage occurs, the residual voltage recording state of the trigger is cleared through a CLR pin, the next normal residual voltage detection function is entered, and meanwhile reverse residual voltage locking is not implemented.
5. The in-place reclosing feeder automation protection device with residual voltage lockout function of claim 1, wherein the in-place reclosing fault isolation module controls the automation protection device to realize fault isolation based on a voltage time type protection mode by the following method:
CB1 is the circuit 1 transformer substation circuit breaker that is qualified for the next round of competitions, and F001-F003 are section switch, and tie L1 is the tie switch, and the coincident formula fault isolation of voltage time type step is as follows:
(a) assuming that grounding or interphase short circuit fault occurs between F002 and F003, CB1 trips for the first time, after coincidence time, voltage time type is realized based on the principle that incoming calls are immediately closed and no-voltage release is carried out, F001-F002 are sequentially closed in X time, and the X time is delay time of closing the circuit breaker when one side of the circuit breaker is in an incoming call;
(b) when F002 is switched on, if the fault is a permanent fault, the fault exists after the switch is switched on, then the section switch F003 can detect a residual voltage signal, the load side is switched on, meanwhile, the F002 is switched on in the forward direction when the single-side voltage loss occurs in the Y time, and the Y time is the fault detection time after the circuit breaker is switched on;
(c) meanwhile, due to the occurrence of interphase short circuit, the CB1 trips for the second time, after the reclosing time, the CB1 recloses for the second time, the power on of the F001 is coincided, and the closing of the F002 is not coincided due to forward locking; f003 is locked due to residual voltage, the closing of the load side is carried out when the electricity is supplied, namely the contact switch L1 is closed after the time of single-side voltage loss XL, the F003 is locked and closed, and the time of XL is the time of single-side voltage loss closing delay time of a contact switch breaker;
(d) finally, the F002 and the F003 are not switched on, and the fault between the F002 and the F003 is isolated through secondary reclosing, so that fault isolation processing is realized; the closing is the closing of the circuit breaker, the closing of the circuit breaker is not allowed, the forward closing of the circuit breaker is the closing of the circuit breaker by the power supply, and the reverse closing of the circuit breaker is the closing of the circuit breaker by the power supply.
6. The on-site reclosing feeder automation protection device with residual voltage lockout function of any of claims 1-5, wherein the residual voltage detection circuit is securely connected to the feeder automation protection device through the pin header in on-board mode, and the residual voltage detection circuit is directly integrated into the collection module of the feeder automation protection device in integrated mode.
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| CN202111286762.9A CN114156844B (en) | 2021-10-29 | 2021-10-29 | In-situ coincident feeder line automatic protection device with residual voltage locking function |
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| CN202111286762.9A CN114156844B (en) | 2021-10-29 | 2021-10-29 | In-situ coincident feeder line automatic protection device with residual voltage locking function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115201548A (en) * | 2022-09-14 | 2022-10-18 | 石家庄科林电气股份有限公司 | Residual voltage detection recording device and method for power distribution terminal |
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| 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 |
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| 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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| CN115201548A (en) * | 2022-09-14 | 2022-10-18 | 石家庄科林电气股份有限公司 | Residual voltage detection recording device and method for power distribution terminal |
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