CN211577392U - Transformer substation secondary circuit breakage detector - Google Patents
Transformer substation secondary circuit breakage detector Download PDFInfo
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- CN211577392U CN211577392U CN201922173228.1U CN201922173228U CN211577392U CN 211577392 U CN211577392 U CN 211577392U CN 201922173228 U CN201922173228 U CN 201922173228U CN 211577392 U CN211577392 U CN 211577392U
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Abstract
The utility model discloses a transformer substation's secondary circuit broken string detector belongs to broken string detection area. 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 secondary circuit of the electrified transformer substation, the detection head is arranged on a pen-shaped shell, 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. Utility model adopts the non-electric contact formula mode to detect whether the secondary circuit of transformer substation breaks a circuit, and its removal that can be convenient can also be used to detect the route or the condition of opening a circuit of other circuits.
Description
Technical Field
The utility model relates to a circuit broken string detects technical field, concretely relates to transformer substation's secondary circuit broken string detector.
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.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a transformer substation's secondary circuit broken string detector to solve current transformer substation's secondary circuit broken string detector and need insert the technical problem of transformer substation's secondary circuit.
In order to achieve the above purpose, the utility model 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 for detecting a magnetic field associated with a transformer substation secondary circuit which is electrified, the detection head is installed on a pen-shaped shell and 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 broken wire detecting device and the broken wire output device are both arranged in the pen-shaped shell, and the detecting 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.
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 utility model has the advantages that:
the utility model discloses an alternating current signal in the passive induction substation secondary circuit of magnetic field detection module to through signal amplification, signal filtering processing back, make the fourth signal of output only relevant with the substation secondary circuit that is detected, the broken string output device output corresponds the passageway information or the information that opens circuit of the substation secondary circuit that is detected. 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 utility model discloses transformer substation's secondary circuit broken string detector can be applied to and detect all secondary circuit connecting wires of transformer substation, including the direct current circuit who carries the signal. The utility model discloses the removal that secondary circuit broken string detector of transformer substation can be convenient can also be used for detecting the other route or the condition of opening circuit that carry alternating current signal's circuit.
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 due to 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.
Drawings
Fig. 1 is the utility model relates to a transformer substation's secondary circuit broken string detector's signal amplification module and signal filtering module's circuit schematic diagram. 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 the utility model relates to a power module and broken string output device's of transformer substation's secondary circuit broken string detector circuit schematic diagram. 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 memory chip, each of the light emitting diodes D811, D911, and D912 selects a red light emitting diode, each of the light emitting diodes D812, D913, and D914 selects a green light emitting diode, the potentiometer RP87 forms an input module of the single chip microcomputer, Vin can select a 4.3V-6V dc voltage for input, and Battery selects a 4.2V lithium Battery.
Fig. 3 is the utility model relates to a transformer substation's secondary circuit broken string detector detects three kinds of optional cross-sectional views of head. 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 embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
When the secondary circuit of the transformer substation is in a linkage state, alternating current and alternating current signals are necessarily conducted in the secondary circuit or direct current is mainly conducted in the secondary circuit.
The utility model discloses a first part:
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 accompanying the secondary circuit of the electrified substation, the detection head being mounted on a pen-shaped housing (not shown), the detection head 20 being 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 both mounted 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.
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 replacements 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 (6)
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 a magnetic field associated with a transformer substation secondary circuit which is electrified, the detection head is installed on a pen-shaped shell and 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 transformer substation secondary circuit to be detected; 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 mainly fed with dc current, and allows signals with a frequency <100hz to pass if the detected substation secondary circuit is mainly fed with 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. The substation secondary circuit disconnection detector of claim 1, wherein the disconnection detection device and the disconnection output device are both mounted within the pen-shaped housing, and the detection head is disposed at a pen tip of the pen-shaped housing.
6. The substation secondary circuit disconnection detector of claim 5, wherein a light-transmitting portion or a sound-transmitting portion is provided at a position of the pen-shaped housing corresponding to the disconnection output device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922173228.1U CN211577392U (en) | 2019-12-06 | 2019-12-06 | Transformer substation secondary circuit breakage detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922173228.1U CN211577392U (en) | 2019-12-06 | 2019-12-06 | Transformer substation secondary circuit breakage detector |
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| CN211577392U true CN211577392U (en) | 2020-09-25 |
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| CN201922173228.1U Active CN211577392U (en) | 2019-12-06 | 2019-12-06 | Transformer substation secondary circuit breakage detector |
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