CN110907860A - Transformer substation secondary circuit disconnection detector and use method thereof - Google Patents
Transformer substation secondary circuit disconnection detector and use method thereof Download PDFInfo
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Abstract
The invention discloses a secondary circuit disconnection detector of a transformer substation, and belongs to the field of disconnection detection. The device comprises a broken line detection device and a broken line output device, wherein the broken line detection device comprises a magnetic field detection module and a detection head for detecting the magnetic field associated with the electrified substation secondary circuit, and the detection head is used for outputting a second signal; the signal filtering module is used for receiving the third signal and outputting a fourth signal only related to the detected substation secondary circuit; and the disconnection output device is used for responding to the fourth signal and outputting a fifth signal carrying the on-circuit information or the disconnection information. The invention also discloses a using method of the cable insulation rubber, which comprises the step of enabling the detection head to be close to the cable insulation rubber of the detected substation secondary circuit. Whether the secondary circuit of the transformer substation is broken or not is detected in a non-electric contact mode, the transformer substation secondary circuit can be moved conveniently, and the transformer substation secondary circuit can be used for detecting the on-off or off-line conditions of other circuits.
Description
Technical Field
The invention relates to the technical field of circuit disconnection detection, in particular to a secondary circuit disconnection detector of a transformer substation and a using method thereof.
Background
In the field of circuit disconnection detection, at least two detection methods are known. One is to transmit an ac detection signal at a certain point of the circuit and detect the ac detection signal at another point of the circuit, and if the ac detection signal can be detected, the circuit is on, and if the ac detection signal cannot be detected, the circuit is off. If there is an ac signal in the circuit, the ac signal can be detected by mutual inductance at any point of the circuit, if the ac signal can be detected, the circuit is a closed circuit, and if the ac signal cannot be detected, the circuit is an open circuit.
The secondary loop of the transformer substation is a system for monitoring, measuring, controlling and protecting and comprises a control system, a signal system, a monitoring system, a relay protection system and an automation system. A net friend with the user name of astragalus sinicus 1992 shares a typical secondary circuit diagram file of a 110kV substation in a hundred-degree library, which exemplarily lists a partial circuit diagram of a secondary circuit of a substation.
Alternating current signals are carried in a secondary circuit of the transformer substation, and the alternating current signals can relate to alternating current signals output by the sensor, so that the alternating current detection signals are not suitable to be transmitted into the circuit. Although alternating current signals are carried in the secondary circuits of the transformer substation, since the electromagnetic environment between the secondary circuits of the transformer substation is complex, and the terminal ends of the secondary circuits are arranged at a short distance (specifically, one protection screen has at least three hundred terminals, the width of each terminal is 5mm, and since the number of the secondary terminals is large, 0-distance contact between each terminal is required), whether the circuit is open or not cannot be accurately judged by using a conventional mutual inductance type circuit breaker detector. Since the secondary circuit of the transformer substation is important, misjudging whether the secondary circuit is an electric wire or not only prolongs the fault first-aid repair time, but also may cause a new power supply fault. Therefore, whether the circuit is broken or not can be searched and judged only by a worker according to a drawing, and the process is time-consuming and labor-consuming. In addition, as the secondary loop of the transformer substation is long in service cycle and frequent in maintenance, the drawing may have the situation of untimely updating or missing updating, which also aggravates the difficulty of troubleshooting, and the long troubleshooting time will affect the timely power supply.
The transformer substation relay protection system secondary connection online detection system described in patent document CN101980418A detects a transformer substation secondary circuit fault in an online monitoring manner, belongs to a part of transformer substation equipment, and is used for an optical fiber link of an intelligent transformer substation.
The method for detecting the disconnection of the secondary circuit of the transformer for the conventional sampling instrument of the transformer substation is disclosed in patent document CN105242167A, and the method for detecting the disconnection of the secondary circuit of the transformer for the conventional sampling instrument is disclosed in patent document CN 105021956A.
Disclosure of Invention
In view of the above, the present invention provides a substation secondary circuit disconnection detector and a method for using the same, so as to solve the technical problem that the existing substation secondary circuit disconnection detector needs to be connected to a substation secondary circuit.
In order to achieve the purpose, the invention adopts the following technical scheme:
a transformer substation secondary circuit disconnection detector comprises a disconnection detection device and a disconnection output device, wherein the disconnection detection device comprises a magnetic field detection module, a signal amplification module and a signal filtering module, the magnetic field detection module comprises a detection head used for detecting a magnetic field associated with an electrified transformer substation secondary circuit, the detection head is used for outputting a second signal, the signal amplification module is used for amplifying the second signal and outputting a third signal, and the signal filtering module is used for receiving the third signal and outputting a fourth signal only related to the detected transformer substation secondary circuit; the disconnection output device is used for responding to the fourth signal and outputting a fifth signal, and the fifth signal carries access information or disconnection information.
Preferably, if the detected substation secondary circuit is mainly provided with a direct current, the signal filtering module allows signals with the frequency within 10 Khz-100 Khz to pass through, and if the detected substation secondary circuit is mainly provided with an alternating current or an alternating current signal, the signal filtering module allows signals with the frequency less than 100hz to pass through.
Preferably, the cross section of the detection head is rectangular, elliptical, waist-shaped or flat, and the width of the detection head is less than or equal to 4.5 mm.
Preferably, the sensitive element of the detection head is a Hall sensor.
Preferably, the pen-shaped shell is further included, the broken line detection device and the broken line output device are installed in the pen-shaped shell, and the detection head is arranged at a pen point of the pen-shaped shell.
Further, a light-transmitting part or a sound-transmitting part is arranged at the position of the pen-shaped shell corresponding to the broken line output device.
A method of using the aforementioned substation secondary circuit disconnection detector, comprising the steps of: and enabling the detection head to be close to a cable of the detected substation secondary circuit, enabling the distance between the detection head and a cable insulation skin of the detected substation secondary circuit to be less than or equal to 1cm, and respectively detecting whether alternating current and direct current are mainly conducted in the detected substation secondary circuit.
Preferably, after the detection head approaches to a cable of the detected substation secondary circuit, the detection head is moved along the cable extending direction of the detected substation secondary circuit to detect whether alternating current is mainly conducted in the detected substation secondary circuit, and the detection head is moved along the cable extending direction of the detected substation secondary circuit again to detect whether direct current is mainly conducted in the detected substation secondary circuit.
Preferably, the speed of moving the detection head is 1cm/s to 2 cm/s.
Preferably, the detection head is attached to a cable insulation sheath of the detected substation secondary circuit, and whether alternating current and direct current are mainly conducted in the detected substation secondary circuit is detected respectively.
The transformer substation secondary circuit connecting wire is compact in arrangement, thin in line width and complex in electromagnetic environment, a non-electric contact type mode is not considered in the field for detecting whether the transformer substation secondary circuit is broken, particularly a magnetic induction mode is not considered for detecting whether the transformer substation secondary circuit is broken, one reason is that the on-line detection mode is adopted for easily realizing broken circuit detection, and the other reason is that direct current or alternating current signals can be mainly conducted in the transformer substation secondary circuit, so that the difficulty is increased for obtaining an accurate detection result. The inventor analyzes that the strength of a magnetic field generated by a secondary circuit of a detected transformer substation is different from that of a magnetic field generated by a secondary circuit of an adjacent transformer substation at a detection point, selects a proper detection point, and rejects a mutual inductance induction signal of the magnetic field generated by the secondary circuit of the adjacent transformer substation after signal amplification and filtering processing, so that the filtered signal is only related to the magnetic field generated by the secondary circuit of the detected transformer substation, and the detection of the on-off state of the secondary circuit of the detected transformer substation is realized.
The invention has the beneficial effects that:
according to the invention, the alternating current signal in the secondary circuit of the transformer substation is passively induced by the magnetic field detection module, and after signal amplification and signal filtering processing, the output fourth signal is only related to the detected secondary circuit of the transformer substation, and the broken line output device outputs the corresponding access information or broken circuit information of the detected secondary circuit of the transformer substation. By means of the magnetic field detection module, the substation secondary circuit disconnection detector can detect the access or disconnection condition of the substation secondary circuit under the condition of non-electric connection of the substation secondary circuit, the original operation mode of a system is not damaged, and the influence of the detection process on the substation secondary circuit is avoided. The substation secondary circuit disconnection detector can be applied to detecting all secondary circuit connecting wires of a substation, including a direct current circuit carrying signals. The secondary circuit disconnection detector of the transformer substation can be conveniently moved and can also be used for detecting the access or disconnection conditions of other circuits carrying alternating current signals.
The cross section of the detection head is rectangular, oval, waist-shaped or flat, so that the magnetic sensitive element can extend in the length direction of the cross section to increase the magnetic flux capture amount. The transformer substation secondary circuit wiring terminal is 5mm, the width of the detection head is less than or equal to 4.5mm, and the problems that after the detection head invades the adjacent transformer substation secondary circuit, the detection head is close to the adjacent transformer substation secondary circuit, and the signal filter circuit cannot filter interference signals generated by the detection head under the influence of alternating current signals in the adjacent transformer substation secondary circuit can be avoided in the use process.
The magnetic induction coil, the Hall sensor and the capacitor can sense an electric signal or a magnetic field formed by the electric signal, but the Hall voltage changes along with the change of the magnetic field intensity, the stronger the magnetic field is, the higher the voltage is, the weaker the magnetic field is, and the lower the voltage is, namely, the Hall voltage is related to the magnetic field intensity, and in the magnetic field formed by the alternating current circuit and the direct current circuit, the closer to the lead, the stronger the magnetic field generated by the current in the lead is, so that the influence of other secondary loops of the transformer substation on the detection result can be reduced. However, one use mode of a magnetic sensitive element formed by the magnetic induction coil is to sleeve the lead, but the sensitive head needs to be sleeved on the lead, so that the original operation mode of the system can be damaged, and the other use mode is to enable the coil to be perpendicular to the lead and arranged on the side surface of the lead when in use. Although one plate of the capacitor may be arranged parallel to the conductor, obtaining a satisfactory induced voltage requires a longer plate, which is also not feasible due to the kinking of the line of the secondary circuit of the substation.
In the method for using the substation secondary circuit disconnection detector, the detection points are determined, whether the substation secondary circuit is connected with direct current or alternating current is detected respectively, and when the detected substation secondary circuit is not connected with direct current or alternating current, the detected substation secondary circuit is determined to be in a disconnection state, so that the detection of the disconnection state of the detected substation secondary circuit is realized.
In the method for using the secondary circuit disconnection detector of the transformer substation, the detection head passes through an electromagnetic field formed by more electrified leads in the process of moving the detection head, so that the detection error caused by a single detection point can be reduced.
Drawings
Fig. 1 is a schematic circuit diagram of a signal amplification module and a signal filtering module of a secondary circuit disconnection detector of a transformer substation. In the figure, the chips U1-A, U2-A, U3-A, U4-A are HT9274 type operational amplifiers, and the chips U5-A, U5-B are LM358DR2G type dual operational amplifiers.
Fig. 2 is a schematic circuit diagram of a power module and a disconnection output device of a secondary circuit disconnection detector of a transformer substation according to the present invention. In the figure, U81 is a charging chip, U82 is an LM1117-3.3 type voltage stabilizing chip, U9 is a single chip microcomputer, U84 is a W25Q64CV type storage chip, a light emitting diode D811, a light emitting diode D911 and a light emitting diode D912 all select red light emitting diodes, a light emitting diode D812, a light emitting diode D913 and a light emitting diode D914 all select green light emitting diodes, a potentiometer RP87 forms an input module of the single chip microcomputer, Vin can select 4.3V-6V direct current voltage input, and Battery selects 4.2V lithium batteries.
Fig. 3 is three alternative sectional views of a detection head of a secondary circuit disconnection detector of a transformer substation. In the figure, 1, a secondary circuit of a transformer substation is connected with a lead, I is current, B is a magnetic induction line, 20 is a detection head, and 21 is a sensitive element.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
First part of the invention:
a transformer substation secondary circuit disconnection detector comprises a disconnection detection device and a disconnection output device. The broken line detection device comprises a magnetic field detection module, a signal amplification module and a signal filtering module.
Referring to fig. 1, according to measurement and calculation, when a direct current is mainly conducted in a secondary circuit of a transformer substation, a signal filtering module needs to allow a signal with a frequency of 10Khz to 100Khz to pass through, that is, the signal filtering module needs to filter a signal with a frequency of less than 10Khz or a frequency of more than 100 Khz; when alternating current or alternating current signals are mainly conducted in a secondary circuit of the transformer substation, the signal filtering module needs to allow signals with the frequency of less than 100hz to pass through, namely, the signal filtering module needs to filter signals with the frequency of more than or equal to 100 hz. In this way, the influence of signals of other frequencies on the detection result can be filtered out.
Referring to fig. 1, the magnetic field detection module includes a detection head 20 for detecting a magnetic field associated with the energized substation secondary circuit, and the detection head 20 is configured to output a second signal. Preferably, the cross section of the detection head is rectangular, elliptical, kidney-shaped or flat, and the width of the detection head 20 is less than or equal to 4.5 mm. Preferably, the sensor 21 of the detection head 20 is a hall sensor.
Referring to fig. 1, the signal amplification module is configured to amplify the second signal and output a third signal, and the signal filtering module is configured to receive the third signal and output a fourth signal only related to the detected substation secondary circuit. In fig. 1, in order to allow the signal filtering module to allow the signal with the frequency between 10Khz and 100Khz or allow the signal with the frequency <100hz to pass through as required, a first contact switch KM11-1 of a relay KM11 is connected in series to an RC oscillating circuit formed by a capacitor C113 and a resistor R112, a second contact switch KM11-2 of a relay KM11 is connected in series to the RC oscillating circuit formed by a capacitor C116 and a resistor R120, and when a coil of the relay KM11 is energized, the signal filtering module allows the signal with the frequency between 10Khz and 100Khz to pass through. The first contact switch KM12-1 of the relay KM12 is connected in series on the RC oscillating circuit formed by the capacitor C123 and the resistor R128, the second contact switch KM12-2 of the relay KM12 is connected in series on the RC oscillating circuit formed by the capacitor C124 and the resistor R129, and when a coil of the relay KM12 is electrified, the signal filtering module allows a signal with the frequency of <100hz to pass through. Referring to fig. 2, a pin 41 of the single chip microcomputer U9 is used for driving a coil of the relay KM11, a pin 48 is used for driving a coil of the relay KM12, and the coil of the relay KM12 or the coil of the relay KM11 can be selectively energized through a selective potentiometer RP 87.
Referring to fig. 1, the disconnection output device is configured to output a fifth signal in response to the fourth signal, where the fifth signal carries connection information or disconnection information. The disconnection output device may be a display, a light emitter, a sound emitter, a vibrator, a memory, a communication bus, etc. The fifth signal output by the disconnection output device can only carry disconnection information, namely, the fifth signal is output only when the detected substation secondary circuit is in a disconnection state; the fifth signal output by the disconnection output device may also carry path information or disconnection information, that is, the fifth signal carrying the disconnection information is output when the detected substation secondary circuit is in a disconnection state, and the fifth signal carrying the path information is output when the detected substation secondary circuit is in a path state. It should be understood that the disconnection output device does not have to output the fifth signal carrying the path information when the detected substation secondary circuit is in the path state.
Preferably, the disconnection detecting means and the disconnection outputting means are installed in a pen-shaped housing (not shown), and the detecting head is provided at a pen tip of the pen-shaped housing. Further, a light-transmitting portion or a sound-transmitting portion is provided at a position of the pen-shaped housing corresponding to the broken wire output means. The light transmission part can be a light transmission window or a transparent member, and the sound transmission part can be a sound transmission hole or a sound transmission film.
When the detection head is used, a terminal A11 and a terminal A12 of the circuit shown in fig. 1 are respectively and electrically connected with a Hall voltage output end of a Hall sensor in the detection head, two current input ends of the Hall sensor are connected with a constant current source in series, and the magnetic induction direction of the Hall sensor is perpendicular to the extension direction of a lead to place the detection head at a detection point. The terminal A13 of the circuit shown in FIG. 1 is electrically connected with the analog input end of the analog-to-digital converter, the digital output end of the analog-to-digital converter is electrically connected with the I/O pin of the controller such as the single chip microcomputer and the PLC, the disconnection output device can select the display electrically connected with the controller, and the on-off state of the circuit of the detected transformer substation secondary circuit is obtained by reading the information displayed by the display. The disconnection output device can also select the illuminator, and the on-off state of the line of the detected substation secondary circuit can be obtained by reading the flicker frequency or the luminous color of the illuminator. In fig. 2, the pin 22 of the single chip microcomputer U9 is multiplexed as an ADC function pin. When detecting whether the detected substation secondary circuit is mainly electrified with direct current, if the detected substation secondary circuit is mainly electrified with direct current, the light-emitting diode D913 emits green light, otherwise, the light-emitting diode D911 emits red light; when detecting whether the detected substation secondary circuit is mainly communicated with alternating current or alternating current signals, if the detected substation secondary circuit is mainly communicated with the alternating current or alternating current signals, the light-emitting diode D912 emits green light, otherwise, the light-emitting diode D914 emits red light; if the detected substation secondary circuit is not connected with direct current or alternating current, the detected substation secondary circuit can be considered to be in an open circuit state.
Second part of the invention:
a method of using the substation secondary loop disconnection detector described in the first aspect of the present invention comprises the steps of: the method comprises the steps of enabling a detection head to be close to a cable of a detected substation secondary circuit, enabling the distance between the detection head and a cable insulation skin of the detected substation secondary circuit to be smaller than or equal to 1cm, respectively detecting whether alternating current (or alternating current signals) and direct current are mainly conducted in the detected substation secondary circuit, if alternating current (or alternating current signals) and direct current are not mainly conducted in the detected substation secondary circuit, considering that the detected substation secondary circuit is in an open circuit state (when the substation secondary circuit is in a linkage state, alternating current and alternating current signals are necessarily conducted in the substation secondary circuit or direct current is mainly conducted in the substation secondary circuit), and reading a fifth signal output by a broken wire output device and carrying path information or open circuit information. Preferably, the detection head is attached to a cable insulation sheath of the detected substation secondary circuit, and whether alternating current (or alternating current signals) and direct current are mainly conducted in the detected substation secondary circuit is detected respectively.
A method of using the substation secondary loop disconnection detector described in the first aspect of the present invention comprises the steps of: after the detection head is attached to a cable insulation sheath of the detected substation secondary circuit, moving the detection head along the cable extending direction of the detected substation secondary circuit, detecting whether alternating current (or alternating current signals) is mainly conducted in the detected substation secondary circuit, moving the detection head along the cable extending direction of the detected substation secondary circuit again, and detecting whether direct current is mainly conducted in the detected substation secondary circuit; if the detected substation secondary circuit is not mainly connected with alternating current (or alternating current signals) or direct current, the detected substation secondary circuit can be considered to be in an open circuit state, and the fifth signal output by the disconnection output device is read to carry access information or disconnection information. Preferably, the speed of moving the detection head is 1cm/s to 2 cm/s. The speed of the movable detection head is lower than 3cm/s, and the false detection alarm rate is obviously increased when the speed is higher than the speed.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A transformer substation secondary circuit disconnection detector comprises a disconnection detection device and a disconnection output device, and is characterized in that the disconnection detection device comprises a magnetic field detection module, a signal amplification module and a signal filtering module, wherein the magnetic field detection module comprises a detection head used for detecting the magnetic field accompanying a transformer substation secondary circuit which is electrified, the detection head is used for outputting a second signal, the signal amplification module is used for amplifying the second signal and outputting a third signal, and the signal filtering module is used for receiving the third signal and outputting a fourth signal only related to the detected transformer substation secondary circuit; the disconnection output device is used for responding to the fourth signal and outputting a fifth signal, and the fifth signal carries access information or disconnection information.
2. The substation secondary circuit disconnection detector of claim 1, wherein the signal filtering module allows signals with a frequency within a range of 10Khz to 100Khz to pass if the detected substation secondary circuit is fed with mainly dc current, and allows signals with a frequency <100hz to pass if the detected substation secondary circuit is fed with mainly ac current or ac signals.
3. The substation secondary circuit disconnection detector of claim 1, wherein the cross section of the detection head is rectangular, elliptical, kidney-shaped or flat, and the width of the detection head is less than or equal to 4.5 mm.
4. The substation secondary circuit disconnection detector of claim 1, wherein the sensing element of the detection head is a hall sensor.
5. A method of using the substation secondary loop disconnection detector of any of claims 1-4, comprising the steps of: and enabling the detection head to be close to a cable of the detected substation secondary circuit, enabling the distance between the detection head and a cable insulation skin of the detected substation secondary circuit to be less than or equal to 1cm, and respectively detecting whether alternating current and direct current are mainly conducted in the detected substation secondary circuit.
6. The method of using a substation secondary circuit disconnection detector according to claim 5, wherein after the detection head approaches the cable of the substation secondary circuit to be detected, the detection head is moved along the cable extending direction of the substation secondary circuit to detect whether ac current is mainly conducted in the substation secondary circuit to be detected, and the detection head is moved again along the cable extending direction of the substation secondary circuit to be detected to detect whether dc current is mainly conducted in the substation secondary circuit to be detected.
7. The method of using a substation secondary loop disconnection detector of claim 6, wherein the speed of moving the detection head is 1-2 cm/s.
8. The method of claim 5, wherein the detection head is attached to a cable insulation sheath of the secondary circuit of the substation to be detected, and the detection head detects whether the secondary circuit of the substation to be detected is mainly supplied with alternating current or direct current.
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| JPH0244267A (en) * | 1988-08-04 | 1990-02-14 | Tokyo Electric Power Co Inc:The | Apparatus for detecting disconnection of pt secondary circuit |
| US20050201033A1 (en) * | 2004-03-09 | 2005-09-15 | Samsung Measuring Instruments Co., Ltd. | Apparatus for monitoring open state of the secondary terminals of a current transformer |
| CN101950943A (en) * | 2010-07-07 | 2011-01-19 | 杭州比特信息技术有限公司 | On-line monitoring protection method and device for distributed zero line breakage |
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| CN105911465A (en) * | 2016-04-25 | 2016-08-31 | 国网新疆电力公司检修公司 | Circuit breaker switch state detection device based on principle of magnetic field |
| CN108680772A (en) * | 2018-06-11 | 2018-10-19 | 广西电网有限责任公司电力科学研究院 | A kind of high-voltage circuitbreaker second trial interface arrangement and its test method |
| CN108919025A (en) * | 2018-05-21 | 2018-11-30 | 广东伊莱斯电机有限公司 | A kind of power line wire break detection method in three-phase alternating current servo drive system |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0244267A (en) * | 1988-08-04 | 1990-02-14 | Tokyo Electric Power Co Inc:The | Apparatus for detecting disconnection of pt secondary circuit |
| US20050201033A1 (en) * | 2004-03-09 | 2005-09-15 | Samsung Measuring Instruments Co., Ltd. | Apparatus for monitoring open state of the secondary terminals of a current transformer |
| CN101950943A (en) * | 2010-07-07 | 2011-01-19 | 杭州比特信息技术有限公司 | On-line monitoring protection method and device for distributed zero line breakage |
| CN104251950A (en) * | 2013-06-27 | 2014-12-31 | 曹文峰 | Circuit breakage detecting electroprobe alarm |
| CN105911465A (en) * | 2016-04-25 | 2016-08-31 | 国网新疆电力公司检修公司 | Circuit breaker switch state detection device based on principle of magnetic field |
| CN108919025A (en) * | 2018-05-21 | 2018-11-30 | 广东伊莱斯电机有限公司 | A kind of power line wire break detection method in three-phase alternating current servo drive system |
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