CN114114069A - Device and system for determining occurrence of ground fault of cable - Google Patents
Device and system for determining occurrence of ground fault of cable Download PDFInfo
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- CN114114069A CN114114069A CN202010885662.7A CN202010885662A CN114114069A CN 114114069 A CN114114069 A CN 114114069A CN 202010885662 A CN202010885662 A CN 202010885662A CN 114114069 A CN114114069 A CN 114114069A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
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Abstract
The application discloses a device and system for confirming that cable takes place ground fault belongs to power engineering technical field. The device comprises a signal detection assembly, a signal control assembly and a fault prompt assembly, wherein a cable positioned above the ground penetrates through the primary side of a zero sequence current transformer in the signal detection assembly, and when the cable has a ground fault, the secondary side of the zero sequence current transformer can generate zero sequence current; when current passes through the zero sequence current transformer, the triode in a closed loop formed by the bridge rectifier, the signal control component, the adjustable resistor, the fixed resistor, the triode and the relay is in saturation conduction and amplifies the current in the circuit, when the relay coil has equivalent current flowing through, the relay is attracted, then the first switch of the fault prompting component is closed and the second switch is closed, and personnel on duty can be prompted to have ground fault and timely carry out emergency repair work. The device can determine that the cable has ground fault in the operation of the cable, and saves the production cost.
Description
Technical Field
The present application relates to the field of power engineering technologies, and in particular, to a device and a system for determining a ground fault occurring in a cable.
Background
In a power distribution system, a power distribution line mostly uses a cable to transmit electric power. Although the cable has the advantages of safety, reliability and the like, different types of faults can occur in operation due to the manufacturing process, the maintenance process, the insulation aging, the external force damage and the like of the cable. At present, because the cable is usually buried deeply in the ground, the cable is easy to have ground fault, and the normal operation of equipment in a power distribution system is influenced.
At present, a plurality of cables, for example 3-4, are usually included in the distribution lines, and when the distribution lines are found to have ground faults in a transformer substation, an offline detection method is usually adopted, and each cable is subjected to power failure detection and confirmation one by one. However, since the off-line detection method requires a power failure, not only is normal production affected, but also production cost is increased.
Disclosure of Invention
In view of this, the present application provides an apparatus and a system for determining that a ground fault occurs in a cable, which can determine that a ground fault occurs in the cable during an operation process of the cable, thereby saving production cost.
Specifically, the method comprises the following technical scheme:
in one aspect, the present embodiments provide an apparatus for determining that a cable has a ground fault, the apparatus including a signal detection component, a signal control component, and a fault indication component, wherein,
the signal detection assembly comprises a zero sequence current transformer, a voltage divider, a transformer and a bridge rectifier, wherein a cable positioned above the ground penetrates through the primary side of the zero sequence current transformer, the secondary side of the zero sequence current transformer is connected with one end of the voltage divider, the other end of the voltage divider is connected with the ground, the input end of the transformer is connected with the voltage divider in parallel, the output end of the transformer is respectively connected with the first input end and the second input end of the bridge rectifier, and the second output end of the bridge rectifier is a common end of a direct current power supply;
the signal control assembly comprises an adjustable resistor, a fixed resistor, a triode and a relay, wherein a first output end of the bridge rectifier is connected with one end of the adjustable resistor, a second output end of the bridge rectifier is connected with one end of the relay, the other end of the adjustable resistor is respectively connected with one end of the fixed resistor and an emitting electrode of the triode, the other end of the fixed resistor is connected with a base electrode of the triode, and the other end of the relay is connected with a collector electrode of the triode;
the fault prompting component comprises a first switch, a ringing piece, a second switch, a signal transmitter and a signal receiver, wherein one end of the first switch is connected with one end of the ringing piece, the other end of the ringing piece is connected with the other end of the first switch, one end of the second switch is connected with one end of the signal transmitter, the other end of the signal transmitter is connected with the other end of the second switch, and the signal transmitter is in signal connection with the signal receiver.
In one possible design, the other end of the voltage divider is connected to the housing of the zero sequence current transformer, and the housing of the zero sequence current transformer is connected to the ground.
In a possible design, the signal detection assembly further includes a filter capacitor, one end of the filter capacitor is connected to the first output end of the bridge rectifier and one end of the adjustable resistor, and the other end of the filter capacitor is connected to the second output end of the bridge rectifier and one end of the relay.
In one possible design, the signal detection assembly further includes an ammeter connected in parallel with the voltage divider.
In one possible design, the ammeter is a milliammeter.
In a possible design, the fixed resistor includes a first resistor and a second resistor, one end of the first resistor is connected to one end of the second resistor, the other end of the first resistor is connected to the other end of the adjustable resistor and the emitter of the transistor, respectively, and the other end of the second resistor is connected to the base of the transistor.
In a possible design, the signal control component further includes a bypass capacitor, one end of the bypass capacitor is connected to one end of the first resistor and one end of the second resistor, and the other end of the bypass capacitor is connected to the second output terminal of the bridge rectifier and one end of the relay.
In one possible design, the signal control component further includes a diode connected in parallel with the relay.
In one possible design, the fault prompting component further comprises a prompting lamp and a power supply, one end of the prompting lamp is connected with the other end of the ringing piece, the other end of the prompting lamp is connected with one end of the power supply, and the other end of the power supply is connected with the other end of the first switch.
On the other hand, the embodiment of the present application further provides a system for determining that a cable has a ground fault, where the system includes a plurality of apparatuses for determining that a cable has a ground fault and a plurality of cables, and zero-sequence current transformers in the apparatuses for determining that a cable has a ground fault are sleeved on the cables above the ground in a one-to-one correspondence manner.
The technical scheme provided by the embodiment of the application has the beneficial effects that at least:
when a cable has a ground fault, current passes through the zero-sequence current transformer, so that the voltage divider divides the voltage, the input end of the transformer can obtain the voltage from the voltage divider and output the voltage from the output end of the transformer to be transmitted to the bridge rectifier, and the second output end of the bridge rectifier is a common end of a direct-current power supply, so that the bridge rectifier can be changed into the direct-current power supply, the triode in a closed loop formed by the bridge rectifier, the adjustable resistor, the fixed resistor, the triode and the relay is in saturated conduction and amplifies the current in the circuit, a relay coil has equivalent current flowing through, the relay is attracted, and then a first switch of the fault prompting component is closed and a second switch of the fault prompting component is closed; on the other hand, the signal transmitter transmits a fault occurrence signal to the signal receiver, and after the signal receiver receives the fault occurrence signal, the signal transmitter can prompt an on-duty worker that a ground fault occurs, so that the on-duty worker can timely inform power maintenance personnel of emergency repair work.
The device for determining the occurrence of the ground fault of the cable can determine the occurrence of the ground fault of the cable in the operation process of the cable, is convenient for rapid first-aid repair operation, and saves the production cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an apparatus for determining a ground fault of a cable according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a system for determining that a cable has a ground fault according to an embodiment of the present application.
The reference numerals in the figures are denoted respectively by:
1-means for determining that a cable has a ground fault,
11-the signal-detecting component or components,
a 111-zero sequence current transformer is provided,
112-a voltage divider-the voltage of which,
113-a transformer-a power supply for the power supply,
114-a bridge rectifier, which is,
1141-a first input terminal for receiving a first input signal,
1142-a second input terminal for receiving a second input signal,
1143-a first output terminal for outputting a first control signal,
1144-a second output terminal for outputting a signal,
115-a filter capacitance-the filter capacitance is,
116-an electric current meter, wherein,
117-the first housing of the first housing,
12-the control of the assembly by means of a signal,
121-an adjustable resistance-the resistance of which,
122-a fixed resistance, the resistance of which,
1221-the first resistance of the first resistor,
1222-a second resistance, which is,
123-a triode and a control circuit, wherein the triode,
1231-an emitter, which is a cathode,
a 1232-base electrode, which is,
1233-the current collector(s),
124-a relay, wherein the relay is connected with a power supply,
125-a bypass capacitance-the capacitance of the shunt,
126-a diode-the light-emitting diode,
127-the second housing, and the second housing,
13-a fault-prompting component for prompting a fault,
131-the first switch-is,
132-a ring member, which is,
133-a second switch-the first switch,
134-a signal transmitter,
135-the signal receiver-is,
136-a warning light for indicating that the user is in a normal state,
137-a power source for supplying power to the device,
138-a third housing, the third housing,
139-a fourth housing, and a fourth housing,
2-cable.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.
Unless defined otherwise, all technical terms used in the examples of the present application have the same meaning as commonly understood by one of ordinary skill in the art.
In order to make the technical solutions and advantages of the present application clearer, the following will describe the embodiments of the present application in further detail with reference to the accompanying drawings.
In a power distribution system, a power distribution line mostly uses a cable to transmit electric power. Although the cable has the advantages of safety, reliability and the like, different types of faults can occur in operation due to the manufacturing process, the maintenance process, the insulation aging, the external force damage and the like of the cable.
For a cable buried deep in the ground, when damage occurs to the cable, for example, due to insulation degradation, a phase of the cable is grounded, which may cause an unpredictable economic loss in the safe and reliable operation of the power distribution system. Because the cable among the distribution system is a plurality of syntropy usually, for example 3 ~ 4, after a certain cable takes place ground fault and takes place, if can not discover in time for electrical equipment's long-time ground connection phase failure operation, the insulating properties of some equipment must lead to the fact destruction, has influenced the normal operating of equipment, still can burn out transformer, motor when serious, enlarges fault range, influences normal production.
At present, when a distribution line is found to have a ground fault in a substation, an offline detection method is generally adopted to detect and confirm power failure of each cable one by one so as to determine the cable having the ground fault. However, since the off-line detection method needs to be performed in a power failure mode, normal production is affected, and production cost is increased.
In order to solve the problems in the prior art, the embodiment of the present application provides an apparatus 1 for determining that a cable has a ground fault, and a schematic structural diagram of the apparatus is shown in fig. 1.
Referring to fig. 1, the apparatus 1 includes a signal detection assembly 11, a signal control assembly 12, and a fault notification assembly 13.
The signal detection assembly 11 includes a zero sequence current transformer 111, a voltage divider 112, a transformer 113 and a bridge rectifier 114, wherein the cable 2 located above the ground passes through a primary side of the zero sequence current transformer 111, that is, the zero sequence current transformer 111 can be sleeved on a cable head, that is, a port of the cable 2 located above the ground; the secondary side of the zero sequence current transformer 111 is connected with one end of the voltage divider 112, the other end of the voltage divider 112 is connected with the ground, the input end of the transformer 113 is connected with the voltage divider 112 in parallel, the output end of the transformer 113 is connected with the first input end 1141 and the second input end 1142 of the bridge rectifier 114 respectively, and the second output end 1144 of the bridge rectifier 114 is a common end of the dc power supply.
It should be noted that the working principle of the zero-sequence current transformer 111 is based on kirchhoff's current law, that is, the algebraic sum of complex currents flowing into any node in the circuit is equal to zero. When the cable 2 has no ground fault, the vector sum of the currents of the phases is equal to zero, so that no current passes through the secondary winding of the zero-sequence current transformer 111. When the cable 2 has a ground fault, the vector sum of each phase current is not zero, the fault current causes a magnetic flux to be generated in the annular iron core of the zero sequence current transformer 111, and the secondary side of the zero sequence current transformer 111 induces voltage and current passes through.
The signal control component 12 includes an adjustable resistor 121, a fixed resistor 122, a transistor 123 and a relay 124, a first output end 1143 of the bridge rectifier 114 is connected to one end of the adjustable resistor 121, a second output end 1144 of the bridge rectifier 114 is connected to one end of the relay 124, the other end of the adjustable resistor 121 is respectively connected to one end of the fixed resistor 122 and an emitter 1231 of the transistor 123, the other end of the fixed resistor 122 is connected to a base 1232 of the transistor 123, and the other end of the relay 124 is connected to a collector 1233 of the transistor 123.
Here, dc power common means circuit ground, which is the negative pole of the power supply when the bridge rectifier 114 is a dc power supply.
The fault prompting component 13 comprises a first switch 131, a ringing member 132, a second switch 133, a signal transmitter 134 and a signal receiver 135, wherein one end of the first switch 131 is connected with one end of the ringing member 132, and the other end of the ringing member 132 is connected with the other end of the first switch 131, so that the first switch 131 and the ringing member 132 form a closed loop; one end of the second switch 133 is connected to one end of the signal transmitter 134, and the other end of the signal transmitter 134 is connected to the other end of the second switch 133, so that the two switches 133 and the signal transmitter 134 form a closed loop; the signal transmitter 134 is in signal connection with the signal receiver 135 such that the signal transmitter 134 and the signal receiver 135 can be located at different places.
The working principle of the device 1 for determining the occurrence of the ground fault of the cable provided by the embodiment of the application is as follows:
when the cable 2 has a ground fault, a current flows through the zero-sequence current transformer 111, so that the voltage divider 112 divides the voltage, the input of the transformer 113 may then receive the voltage from the voltage divider 112, and output the voltage from the output of the transformer 113, to the bridge rectifier 114, since the second output terminal 1144 of the bridge rectifier 114 is a dc common terminal, the bridge rectifier 114 can be a dc power source, so that the transistor 123 in the closed loop formed by the bridge rectifier 114, the adjustable resistor 121, the fixed resistor 122, the transistor 123 and the relay 124 is conducted in saturation and amplifies the current in the circuit, so that the coil of the relay 124 has a considerable current flowing through, the relay 124 is pulled in, then the first switch 131 and the second switch 133 of the fault prompting component 13 are closed, on one hand, the ringing member 132 sends out an alarm ring to prompt the field operator that a ground fault occurs; on the other hand, the signal transmitter 134 transmits a fault occurrence signal to the signal receiver 135, and after the signal receiver 135 receives the fault occurrence signal, the signal transmitter can prompt the on-duty personnel that a ground fault occurs, so that the on-duty personnel can timely inform the power maintenance personnel of performing emergency repair work.
Therefore, the device 1 for determining the occurrence of the ground fault of the cable provided by the embodiment of the application utilizes the signal detection assembly 11, the signal control assembly 12 and the fault prompt assembly 13, can determine that the ground fault of the cable 2 occurs in the operation process of the cable 2, is convenient for fast first-aid repair operation, and saves the production cost.
For the signal detection component 11, the signal detection component 11 is used for detecting and acquiring a zero-sequence current signal.
In one possible design, the zero sequence current transformer 111 is a circular ring and may be fixed on the ground through a bracket (not shown).
In a possible design, referring to fig. 1, the other end of the voltage divider 112 is connected to the housing of the zero sequence current transformer 111, and the housing of the zero sequence current transformer 111 is connected to the ground, so as to prevent an operator from getting an electric shock during operation due to the electrification of the zero sequence current transformer 111.
In a possible design, the signal detecting assembly 11 further includes a filter capacitor 115, one end of the filter capacitor 115 is connected to the first output terminal 1143 of the bridge rectifier 114 and one end of the adjustable resistor 121, and the other end of the filter capacitor 115 is connected to the second output terminal 1144 of the bridge rectifier 114 and one end of the relay 124.
By arranging the filter capacitor 115, the ac part still existing in the dc rectified by the bridge rectifier 114 can be effectively eliminated.
It is understood that one end of the filter capacitor 115 connected to the first output terminal 1143 of the bridge rectifier 114 and one end of the adjustable resistor 121 is a positive electrode, and the other end connected to the second output terminal 1144 of the bridge rectifier 114 and one end of the relay 124 is a negative electrode.
In a possible design, referring to fig. 1, in addition to the zero-sequence current transformer 111, the voltage divider 112, the transformer 113, the bridge rectifier 114 and the filter capacitor 115, the signal detection assembly 11 further includes an ammeter 116, the ammeter 116 is connected in parallel with the voltage divider 112, and the ammeter 116 can be used to measure and obtain the value of the current in the zero-sequence current transformer 111.
Optionally, the ammeter 116 is a milliammeter, so that an operator can observe the current value conveniently.
In one possible design, transformer 113 is an isolated coupled transformer, preventing high voltages from passing through.
In one possible design, the zero-sequence current transformer 111, the voltage divider 112, the transformer 113, the bridge rectifier 114, the filter capacitor 115, and the ammeter 116 may all be located in a first housing 117, and the first housing 117 may be utilized to support and protect the zero-sequence current transformer 111, the voltage divider 112, the transformer 113, the bridge rectifier 114, the filter capacitor 115, and the ammeter 116.
For the signal control assembly 12, the signal control assembly 12 is used to amplify the current in the circuit so that the relay 124 is engaged.
In one possible design, referring to fig. 1, the fixed resistor 122 includes a first resistor 1221 and a second resistor 1222, one end of the first resistor 1221 is connected to one end of the second resistor 1222, the other end of the first resistor 1221 is respectively connected to the other end of the adjustable resistor 121 and the emitter 1231 of the transistor 123, and the other end of the second resistor 1222 is connected to the base 1232 of the transistor 123.
With such arrangement, the first resistor 1221 and the second resistor 1222 can both divide the voltage of the transistor 123, so as to prevent the current passing through the transistor 123 from being too large, thereby playing a role in protecting the transistor 123; meanwhile, the circuit formed by the first resistor 1221 and the second resistor 1222 can also provide a trigger current for the transistor 123.
Optionally, the value of the first resistor 1221 may range from 1k to 1.5 k.
Optionally, the value of the second resistor 1222 may range from 750 Ω to 1 k.
Optionally, the value range of the adjustable resistor 121 may be 5k to 150 k.
In one possible design, the signal control component 12 further includes a bypass capacitor 125, one end of the bypass capacitor 125 is connected to one end of the first resistor 1221 and one end of the second resistor 1222, and the other end of the bypass capacitor 125 is connected to the second output terminal 1144 of the bridge rectifier 114 and one end of the relay 124.
By providing the bypass capacitor 125, noise signals on the power supply can be eliminated, interference of noise signals can be prevented, and on-state voltage and current can be supplied to the transistor 123.
In one possible design, referring to fig. 1, the signal control assembly 12 further includes a diode 126, the diode 126 being connected in parallel with the relay 124 and in anti-parallel with the relay 124.
The back-emf generated when the relay 124 is open is prevented from affecting the circuit or damaging the transistor 123 by the diode 126, which is in the opposite direction from the relay 124 to provide a return path for the back-emf.
In one possible design, the adjustable resistor 121, the fixed resistor 122, the transistor 123, the relay 124, the bypass capacitor 125, and the diode 126 may all be located in the second housing 127, and the adjustable resistor 121, the fixed resistor 122, the transistor 123, the relay 124, the bypass capacitor 125, and the diode 126 may be supported and protected by the second housing 127.
For the fault notification assembly 13, the fault notification assembly 13 is used to notify an operator that the cable 2 has a ground fault, and needs to be dealt with as soon as possible.
It can be understood that, when the relay 124 in the signal control component 12 is closed, the first switch 131 and the second switch 133 can be closed, so that the lines where the first switch 131 and the second switch 133 are located are conducted.
In one possible design, referring to fig. 1, the fault indicating assembly 13 further includes an indicator light 136 and a power supply 137, one end of the indicator light 136 is connected to the other end of the bell member 132, the other end of the indicator light 136 is connected to one end of the power supply 137, and the other end of the power supply 137 is connected to the other end of the first switch 131.
Wherein, power 137 can provide electric power support for ringing member 132 and warning light 136, and when first switch 131 closed back, ringing member 132 rings, and warning light 136 lights, sends the sound and the light suggestion of reporting to the police, and the operating personnel of being convenient for in time discovers.
Alternatively, power supply 137 may be 220V AC.
Optionally, the notification light 136 may be a flashing warning light.
In one possible design, the first switch 131, the chime 132, and a portion of the notification light 136 are located within the third housing 138, and another portion of the notification light 136 is located outside the third housing 138, with the third housing 138 providing support and protection for the first switch 131, the chime 132, and the notification light 136.
In one possible design, the second switch 133 and the signal transmitter 134 may be located within a fourth housing 139, with the fourth housing 139 providing protection for the second switch 133 and the signal transmitter 134.
In one possible design, signal receiver 135 may be located in a monitoring room remote from cable 2 and on duty personnel in the monitoring room.
When the second switch 133 is closed, the signal transmitter 134 works to send a fault prompt signal to the signal receiver 135, so that the signal receiver 135 converts the signal into fault prompt information after receiving the fault prompt signal and displays the fault prompt information to an operator on duty in time, and the operator does not need to go to the site to perform troubleshooting and discovery one by one, thereby improving the working efficiency.
In a possible example, the operator may place the apparatus 1 for determining the occurrence of the ground fault on the cable 2 provided in the embodiment of the present application on one side of the portion of the cable 2 exposed from the ground, so that the current 2 above the ground passes through the primary side of the zero-sequence current transformer 111 of the signal detection assembly 11, and the first housing 117, the second housing 127, the third housing 138 and the fourth housing 139 are placed to leave.
On the other hand, the embodiment of the present application further provides a system for determining that a cable has a ground fault, a schematic structural diagram of which is shown in fig. 2, and the system includes a plurality of devices 1 for determining that a cable has a ground fault and a plurality of cables 2 as described above.
The zero sequence current transformers 111 in the device 1 for determining the occurrence of the ground fault of the cable are sleeved on the cables 2 located above the ground in a one-to-one correspondence manner, that is, the number of the devices 1 for determining the occurrence of the ground fault of the cable is the same as that of the cables 2.
It will be appreciated that other components of the apparatus 1 for determining that a cable has a ground fault are located on one side of their respective cables 2.
Alternatively, the cable 2 may be a high voltage cable.
Because the cable 2 among the distribution system is a plurality of commonly operation usually, for example 3 ~ 4, if can not satisfy the detection needs only to carry out ground fault's confirmation in a plurality of cables, therefore need all correspond every cable 2 and set up device 1 that is used for confirming that the cable takes place ground fault, ensure that every cable 2 can all obtain detecting and in time discover ground fault problem.
Based on the system, the device 1 for determining the occurrence of the ground fault of the cable is used, so that the occurrence of the ground fault of the cable 2 can be determined in the running process of each cable 2, the ground fault can be found timely by an operator, the rapid first-aid repair operation is facilitated, and the production cost is saved.
In this application, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the present application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A device (1) for determining the occurrence of a ground fault of a cable, characterized in that the device (1) comprises a signal detection component (11), a signal control component (12) and a fault indication component (13), wherein,
the signal detection assembly (11) comprises a zero sequence current transformer (111), a voltage divider (112), a transformer (113) and a bridge rectifier (114), wherein a cable (2) located above the ground penetrates through the primary side of the zero sequence current transformer (111), the secondary side of the zero sequence current transformer (111) is connected with one end of the voltage divider (112), the other end of the voltage divider (112) is connected with the ground, the input end of the transformer (113) is connected with the voltage divider (112) in parallel, the output end of the transformer (113) is respectively connected with a first input end (1141) and a second input end (1142) of the bridge rectifier (114), and a second output end (1144) of the bridge rectifier (114) is a common end of a direct current power supply;
the signal control assembly (12) comprises an adjustable resistor (121), a fixed resistor (122), a triode (123) and a relay (124), wherein a first output end (1143) of the bridge rectifier (114) is connected with one end of the adjustable resistor (121), a second output end (1144) of the bridge rectifier (114) is connected with one end of the relay (124), the other end of the adjustable resistor (121) is respectively connected with one end of the fixed resistor (122) and an emitter (1231) of the triode (123), the other end of the fixed resistor (122) is connected with a base electrode (1232) of the triode (123), and the other end of the relay (124) is connected with a collector (1233) of the triode (123);
the fault prompting component (13) comprises a first switch (131), a ringing piece (132), a second switch (133), a signal transmitter (134) and a signal receiver (135), one end of the first switch (131) is connected with one end of the ringing piece (132), the other end of the ringing piece (132) is connected with the other end of the first switch (131), one end of the second switch (133) is connected with one end of the signal transmitter (134), the other end of the signal transmitter (134) is connected with the other end of the second switch (133), and the signal transmitter (134) is in signal connection with the signal receiver (135).
2. The apparatus (1) for determining a ground fault of a cable according to claim 1, characterized in that the other end of the voltage divider (112) is connected to the housing of the zero sequence current transformer (111), the housing of the zero sequence current transformer (111) being connected to earth.
3. The apparatus (1) for determining a ground fault of a cable according to claim 1, wherein the signal detection assembly (11) further comprises a filter capacitor (115), one end of the filter capacitor (115) is connected to the first output terminal (1143) of the bridge rectifier (114) and one end of the adjustable resistor (121), and the other end of the filter capacitor (115) is connected to the second output terminal (1144) of the bridge rectifier (114) and one end of the relay (124).
4. The apparatus (1) for determining a ground fault of a cable according to claim 1, wherein the signal detection assembly (11) further comprises an ammeter (116), the ammeter (116) being connected in parallel with the voltage divider (112).
5. Device (1) for determining the occurrence of a ground fault of a cable according to claim 4, characterized in that said ammeter (116) is a milliammeter.
6. The device (1) for determining the occurrence of a ground fault of a cable according to claim 1, wherein said fixed resistor (122) comprises a first resistor (1221) and a second resistor (1222), one end of said first resistor (1221) and one end of said second resistor (1222) being connected, the other end of said first resistor (1221) being connected to the other end of said adjustable resistor (121) and to the emitter (1231) of said transistor (123), respectively, and the other end of said second resistor (1222) being connected to the base (1232) of said transistor (123).
7. The apparatus (1) for determining the occurrence of a ground fault of a cable according to claim 6, wherein said signal control assembly (12) further comprises a bypass capacitor (125), one end of said bypass capacitor (125) being connected to one end of said first resistor (1221) and one end of said second resistor (1222), respectively, and the other end of said bypass capacitor (125) being connected to a second output terminal (1144) of said bridge rectifier (114) and one end of said relay (124), respectively.
8. The device (1) for determining the occurrence of a ground fault of an electric cable according to claim 1, characterized in that said signal control assembly (12) further comprises a diode (126), said diode (126) being connected in parallel to said relay (124).
9. The apparatus (1) for determining a ground fault of a cable according to claim 1, wherein the fault indication assembly (13) further comprises an indication lamp (136) and a power supply (137), one end of the indication lamp (136) is connected with the other end of the ringing member (132), the other end of the indication lamp (136) is connected with one end of the power supply (137), and the other end of the power supply (137) is connected with the other end of the first switch (131).
10. A system for determining a cable ground fault, characterized in that the system comprises a plurality of devices (1) for determining a cable ground fault according to any one of claims 1 to 9 and a plurality of cables (2), and that the zero sequence current transformers (111) in the devices (1) for determining a cable ground fault are sleeved on the cables (2) above the ground in a one-to-one correspondence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010885662.7A CN114114069A (en) | 2020-08-28 | 2020-08-28 | Device and system for determining occurrence of ground fault of cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010885662.7A CN114114069A (en) | 2020-08-28 | 2020-08-28 | Device and system for determining occurrence of ground fault of cable |
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| CN114114069A true CN114114069A (en) | 2022-03-01 |
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| CN202010885662.7A Pending CN114114069A (en) | 2020-08-28 | 2020-08-28 | Device and system for determining occurrence of ground fault of cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117007905A (en) * | 2023-07-05 | 2023-11-07 | 安徽中邦特种电缆科技有限公司 | Fault position indicating device for cable |
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2020
- 2020-08-28 CN CN202010885662.7A patent/CN114114069A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117007905A (en) * | 2023-07-05 | 2023-11-07 | 安徽中邦特种电缆科技有限公司 | Fault position indicating device for cable |
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