CN213337962U - High-voltage line fault indication circuit of low-voltage side - Google Patents
High-voltage line fault indication circuit of low-voltage side Download PDFInfo
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- CN213337962U CN213337962U CN202021247764.8U CN202021247764U CN213337962U CN 213337962 U CN213337962 U CN 213337962U CN 202021247764 U CN202021247764 U CN 202021247764U CN 213337962 U CN213337962 U CN 213337962U
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Abstract
The utility model discloses a high-voltage line fault indicating circuit at a low-voltage side, which comprises a voltage comparison circuit, a trigger alarm circuit and an alarm circuit; the voltage comparison circuit comprises a power supply anode and a power supply cathode, the power supply anode is connected with a voltage monitoring relay J1, a voltage monitoring relay J2 and a voltage monitoring relay J3, an A lead and a B lead are arranged on the voltage monitoring relay J1, the voltage monitoring relay J2 is provided with the A lead and a C lead, the voltage monitoring relay J3 is provided with the B lead and the C lead, and the output end of the voltage monitoring relay J1 is respectively connected with the voltage monitoring relay J2 and the intermediate relay 1. Has the advantages that: when a broken line or a ground fault occurs at the high-voltage side of the 10KV, the fault indicator arranged at the low-voltage side of the power distribution behind the fault point gives an alarm to send a signal, so that the search range of the fault point is reduced, the fault indicator can be used as a supplement for the ground short circuit fault indicator at the high-voltage side of the 10KV, and the use is convenient.
Description
Technical Field
The utility model belongs to the technical field of the detection circuitry technique and specifically relates to a high tension line fault indication circuit of low pressure side is related to.
Background
At present, two devices are commonly adopted for grounding monitoring in a 10KV distribution network. One is a low current ground fault line selector model such as MA196H, which is installed at the outlet of a substation to determine whether it is an in-station fault or an out-of-station fault. In addition, line fault indicators are arranged on the 10KV main line and the branch line and used for detecting short circuit and ground fault on the 10KV line and judging fault directions. The model is CSM-AK8, CSM-EKL series, etc. Because the cable is arranged on a field 10KV line, the natural environment is severe, the installation, the use and the maintenance are inconvenient, and the failure probability is high. To solve this problem. By analyzing the significant characteristics of the 10KV line ground fault. The invention provides a set of disconnection or grounding fault indicator which is arranged in a distribution transformer low-voltage side power distribution cabinet and reflects high-voltage side faults.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a high-voltage line fault indication circuit on a low-voltage side in order to solve the above-mentioned problems.
The technical scheme of the utility model is realized like this:
a high-voltage line fault indication circuit on a low-voltage side comprises a voltage comparison circuit, a trigger alarm circuit and an alarm circuit; the voltage comparison circuit comprises a power supply anode and a power supply cathode, the power supply anode is connected with a voltage monitoring relay J1, a voltage monitoring relay J2 and a voltage monitoring relay J3, a lead A and a lead B are arranged on the voltage monitoring relay J1, the voltage monitoring relay J2 is provided with the lead A and the lead C, the voltage monitoring relay J3 is provided with the lead B and the lead C, the output end of the voltage monitoring relay J1 is respectively connected with the voltage monitoring relay J2 and an intermediate relay 1, the intermediate relay 1 is connected with the power supply cathode, the output end of the voltage monitoring relay J2 is respectively connected with a voltage monitoring relay J3 and an intermediate relay 2, the intermediate relay 2 is connected with the power supply cathode, the output end of the voltage monitoring relay J3 is respectively connected with an intermediate relay 3 and an intermediate relay 4, the intermediate relay 3 and the intermediate relay 4 are both connected with the negative pole of a power supply, the positive pole of the power supply is connected in parallel with a signal relay 12, a signal relay 13 and a signal relay 23 which are arranged in parallel, and the signal relays are connected with the negative pole of the power supply through the intermediate relay 5 after being connected in parallel;
the trigger alarm circuit comprises a power supply anode, the power supply anode is connected with an auxiliary contact of an intermediate relay 5, the output end of the auxiliary contact of the intermediate relay 5 is connected with an auxiliary contact of an intermediate relay 4, the auxiliary contact of the intermediate relay 4 is connected with a relay 6, the power supply anode is connected with the intermediate relay 5 in parallel, the output end of the intermediate relay 5 is connected with a power supply cathode, the power supply anode is connected with the intermediate relay 4 in parallel, and the output end of the intermediate relay 4 is connected with the power supply cathode;
the alarm loop comprises a power supply anode, the power supply anode is connected with a relay 6, and the output end of the relay 6 is connected with the power supply cathode through an alarm and a signal transmitting device respectively.
Further, signal relay 12 includes the power positive pole, the power positive pole is connected with auxiliary contact of auxiliary relay 1, the output of auxiliary contact of auxiliary relay 1 is connected with auxiliary contact of auxiliary relay 2, auxiliary contact of auxiliary relay 2 is connected with signal relay 12, the power positive pole is parallelly connected to have auxiliary relay 1, the output of auxiliary relay 1 is connected with the power negative pole, the power positive pole is parallelly connected to have auxiliary relay 2, the output of auxiliary relay 2 is connected with the power negative pole.
Further, signal relay 23 includes the power positive pole, the power positive pole is connected with auxiliary contact of auxiliary relay 2, the output of auxiliary contact of auxiliary relay 2 is connected with auxiliary contact of auxiliary relay 3, auxiliary contact of auxiliary relay 3 is connected with signal relay 23, the power positive pole is parallelly connected to have auxiliary relay 2, the output of auxiliary relay 2 is connected with the power negative pole, the power positive pole is parallelly connected to have auxiliary relay 3, the output of auxiliary relay 3 is connected with the power negative pole.
Further, signal relay 13 includes the power positive pole, the power positive pole is connected with auxiliary contact of auxiliary relay 1, the output of auxiliary contact of auxiliary relay 1 is connected with auxiliary contact of auxiliary relay 3, auxiliary contact of auxiliary relay 3 is connected with signal relay 13, the power positive pole is parallelly connected to have auxiliary relay 1, the output of auxiliary relay 1 is connected with the power negative pole, the power positive pole is parallelly connected to have auxiliary relay 3, the output of auxiliary relay 3 is connected with the power negative pole.
By adopting the technical scheme, the beneficial effects of the utility model are that: when a broken line or a ground fault occurs at the high-voltage side of the 10KV, the fault indicator arranged at the low-voltage side of the power distribution behind the fault point gives an alarm to send a signal, so that the search range of the fault point is reduced, the fault indicator can be used as a supplement for the ground short circuit fault indicator at the high-voltage side of the 10KV, and the use is convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a diagram of the voltage comparison circuit (Yyn0) of the present invention;
FIG. 2 is a diagram of the trigger alarm circuit of the present invention;
FIG. 3 is a diagram of an alarm circuit of the present invention;
fig. 4 is an internal circuit diagram of the signal relay 12 of the present invention;
fig. 5 is an internal circuit diagram of the signal relay 23 of the present invention;
fig. 6 is an internal circuit diagram of the signal relay 13 of the present invention;
FIG. 7 is a diagram of a voltage comparison circuit (Dyn11) according to the present invention
Fig. 8 is a schematic diagram of a circuit connection group according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to 7, a low-side high-voltage line fault indicating circuit includes a voltage comparison circuit, a trigger alarm circuit and an alarm circuit; the voltage comparison circuit comprises a power supply anode and a power supply cathode, the power supply anode is connected with a voltage monitoring relay J1, a voltage monitoring relay J2 and a voltage monitoring relay J3, a lead A and a lead B are arranged on the voltage monitoring relay J1, the voltage monitoring relay J2 is provided with the lead A and the lead C, the voltage monitoring relay J3 is provided with the lead B and the lead C, the output end of the voltage monitoring relay J1 is respectively connected with the voltage monitoring relay J2 and an intermediate relay 1, the intermediate relay 1 is connected with the power supply cathode, the output end of the voltage monitoring relay J2 is respectively connected with a voltage monitoring relay J3 and an intermediate relay 2, the intermediate relay 2 is connected with the power supply cathode, the output end of the voltage monitoring relay J3 is respectively connected with an intermediate relay 3 and an intermediate relay 4, the intermediate relay 3 and the intermediate relay 4 are both connected with the negative pole of a power supply, the positive pole of the power supply is connected in parallel with a signal relay 12, a signal relay 13 and a signal relay 23 which are arranged in parallel, and the signal relays are connected with the negative pole of the power supply through the intermediate relay 5 after being connected in parallel;
the trigger alarm circuit comprises a power supply anode, the power supply anode is connected with an auxiliary contact of an intermediate relay 5, the output end of the auxiliary contact of the intermediate relay 5 is connected with an auxiliary contact of an intermediate relay 4, the auxiliary contact of the intermediate relay 4 is connected with a relay 6, the power supply anode is connected with the intermediate relay 5 in parallel, the output end of the intermediate relay 5 is connected with a power supply cathode, the power supply anode is connected with the intermediate relay 4 in parallel, and the output end of the intermediate relay 4 is connected with the power supply cathode;
the alarm loop comprises a power supply anode, the power supply anode is connected with a relay 6, and the output end of the relay 6 is connected with the power supply cathode through an alarm and a signal transmitting device respectively.
In this embodiment, signal relay 12 includes the power positive pole, the power positive pole is connected with auxiliary contact of auxiliary relay 1, the output of auxiliary contact of auxiliary relay 1 is connected with auxiliary contact of auxiliary relay 2, auxiliary contact of auxiliary relay 2 is connected with signal relay 12, the power positive pole is parallelly connected to have auxiliary relay 1, the output of auxiliary relay 1 is connected with the power negative pole, the power positive pole is parallelly connected to have auxiliary relay 2, the output of auxiliary relay 2 is connected with the power negative pole.
In this embodiment, signal relay 23 includes the power positive pole, the power positive pole is connected with auxiliary contact of auxiliary relay 2, the output of auxiliary contact of auxiliary relay 2 is connected with auxiliary contact of auxiliary relay 3, auxiliary contact of auxiliary relay 3 is connected with signal relay 23, the power positive pole is parallelly connected to have auxiliary relay 2, the output of auxiliary relay 2 is connected with the power negative pole, the power positive pole is parallelly connected to have auxiliary relay 3, the output of auxiliary relay 3 is connected with the power negative pole.
In this embodiment, signal relay 13 includes the power positive pole, the power positive pole is connected with auxiliary contact of auxiliary relay 1, the output of auxiliary contact of auxiliary relay 1 is connected with auxiliary contact of auxiliary relay 3, auxiliary contact of auxiliary relay 3 is connected with signal relay 13, the power positive pole is parallelly connected to have auxiliary relay 1, the output of auxiliary relay 1 is connected with the power negative pole, the power positive pole is parallelly connected to have auxiliary relay 3, the output of auxiliary relay 3 is connected with the power negative pole.
When the fault of the high-voltage side of the distribution transformer is broken or grounded, the loop sends out an alarm signal.
The high-voltage fault indicator is used for supplementing a 10kV grounding line selection device of a transformer substation and a high-voltage fault indicator assembled on a 10kV transmission line.
The principle is as follows:
according to the obvious characteristic of the line voltage change at the high-voltage side of the distribution transformer, the line voltage ratio of the three-box power transformer in no-load is determined as follows:
10000/400＝25，
if the transformer connection group is Yyn0, the phase-voltage ratio is:
k＝10000√3/400√3＝25，
if when the phase A is disconnected, the two input terminals B, C are equivalent to a common transformer, the primary windings of the two columns are connected in series and then input with voltage 10kV, the two columns are equally divided, the voltages applied by the primary windings of the column B and the column C are respectively 5kV, and then the voltages of the secondary side are:
Uan＝0，
Ubn＝Ucn＝5000/k＝200V，
the secondary side line voltage is:
Uab＝Uan+Ubn＝200V,
Uac＝Uan+Ucn＝200V,
Ubc＝Ubn+Ucn＝400V,
if the transformer coupling group is Dyn11 and the primary winding is triangular, the phase-to-voltage ratio is:
K＝10000/400√3≈43.3，
if when the phase a is disconnected, B, C two terminals are connected to form a parallel circuit, the parallel circuit is composed of two branches, one branch is a primary winding of the column B, the other branch is formed by connecting primary windings of the columns C in series, when 10kV is inputted to B, C two terminals, the voltage applied to the primary winding of the column B is 10kV, the voltages applied to the primary windings of the two columns A, C are 5kV respectively, at a certain moment, the direction of the induced potential of the secondary winding is as shown in fig. 8, and then the phase voltage of the secondary side is:
Ubn＝Ubc/k≈231V，
Uan＝Ucn＝Uac/k≈115V，
in the potential direction in fig. 8, the secondary side line voltage is:
Uab＝Uan+Ubn＝115+231＝346V，
Ubc＝Ubn+Ucn＝231+115＝346V，
Uac＝Uan-Ucn＝115-115＝0，
in summary, two phases rise to 346V and one phase falls to 0.
On the low-voltage side of the Yyn0 transformer, if the high-voltage side A is disconnected, both Uab and Uac are 200V, the auxiliary contacts at the lower ends of the voltage monitoring relays J1 and J2 are closed, the intermediate relays 1 and 2 are switched on, the signal relays 12 are switched on by the auxiliary contacts of the intermediate relays 1 and 2, and the intermediate relays 5 are switched on by the auxiliary contacts of the signal relays 12.
And meanwhile Ubc is 400V, and the auxiliary contact on the voltage monitoring relay J3 is closed to switch on the intermediate relay 4.
When the intermediate relays 4 and 5 act simultaneously, the auxiliary contacts of the intermediate relays are connected with the relay 6, and the auxiliary contacts of the relay 6 trigger an alarm loop to realize alarm.
On the low-voltage side of a Dyn11 (the setting value of which is adjustable) transformer, an auxiliary contact on a voltage monitoring relay is set to be closed when the voltage monitoring relay is higher than 300V, and a lower auxiliary contact is set to be closed when the voltage monitoring relay is lower than 100V, and the principle is similar to that of the low-voltage side of a Yyn0 (the setting value of which is adjustable) transformer.
The relay may be replaced by an integrated circuit element for circuit integration. An alarm communication module is additionally arranged to be connected with a mobile phone or a background monitor to realize real-time alarm.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A high-voltage line fault indication circuit of low pressure side which characterized in that: the device comprises a voltage comparison circuit, a trigger alarm circuit and an alarm circuit; the voltage comparison circuit comprises a power supply anode and a power supply cathode, the power supply anode is connected with a voltage monitoring relay J1, a voltage monitoring relay J2 and a voltage monitoring relay J3, a lead A and a lead B are arranged on the voltage monitoring relay J1, the voltage monitoring relay J2 is provided with the lead A and the lead C, the voltage monitoring relay J3 is provided with the lead B and the lead C, the output end of the voltage monitoring relay J1 is respectively connected with the voltage monitoring relay J2 and an intermediate relay 1, the intermediate relay 1 is connected with the power supply cathode, the output end of the voltage monitoring relay J2 is respectively connected with a voltage monitoring relay J3 and an intermediate relay 2, the intermediate relay 2 is connected with the power supply cathode, the output end of the voltage monitoring relay J3 is respectively connected with an intermediate relay 3 and an intermediate relay 4, the intermediate relay 3 and the intermediate relay 4 are both connected with the negative pole of a power supply, the positive pole of the power supply is connected in parallel with a signal relay 12, a signal relay 13 and a signal relay 23 which are arranged in parallel, and the signal relays are connected with the negative pole of the power supply through the intermediate relay 5 after being connected in parallel;
the trigger alarm circuit comprises a power supply anode, the power supply anode is connected with an auxiliary contact of an intermediate relay 5, the output end of the auxiliary contact of the intermediate relay 5 is connected with an auxiliary contact of an intermediate relay 4, the auxiliary contact of the intermediate relay 4 is connected with a relay 6, the power supply anode is connected with the intermediate relay 5 in parallel, the output end of the intermediate relay 5 is connected with a power supply cathode, the power supply anode is connected with the intermediate relay 4 in parallel, and the output end of the intermediate relay 4 is connected with the power supply cathode;
the alarm loop comprises a power supply anode, the power supply anode is connected with a relay 6, and the output end of the relay 6 is connected with the power supply cathode through an alarm and a signal transmitting device respectively.
2. The low side high voltage line fault indication circuit of claim 1, wherein: signal relay 12 includes the power positive pole, the power positive pole is connected with auxiliary contact of auxiliary relay 1, the output of auxiliary contact of auxiliary relay 1 is connected with auxiliary contact of auxiliary relay 2, auxiliary contact of auxiliary relay 2 is connected with signal relay 12, the power positive pole is parallelly connected to have auxiliary relay 1, the output of auxiliary relay 1 is connected with the power negative pole, the power positive pole is parallelly connected to have auxiliary relay 2, the output of auxiliary relay 2 is connected with the power negative pole.
3. The low side high voltage line fault indication circuit of claim 1, wherein: the signal relay 23 includes the power positive pole, the power positive pole is connected with auxiliary contact of auxiliary relay 2, the output of auxiliary contact of auxiliary relay 2 is connected with auxiliary contact of auxiliary relay 3, auxiliary contact of auxiliary relay 3 is connected with signal relay 23, the power positive pole is parallelly connected to have auxiliary relay 2, the output of auxiliary relay 2 is connected with the power negative pole, the power positive pole is parallelly connected to have auxiliary relay 3, the output of auxiliary relay 3 is connected with the power negative pole.
4. The low side high voltage line fault indication circuit of claim 1, wherein: signal relay 13 includes the power positive pole, the power positive pole is connected with auxiliary contact of auxiliary relay 1, the output of auxiliary contact of auxiliary relay 1 is connected with auxiliary contact of auxiliary relay 3, auxiliary contact of auxiliary relay 3 is connected with signal relay 13, the power positive pole is parallelly connected to have auxiliary relay 1, the output of auxiliary relay 1 is connected with the power negative pole, the power positive pole is parallelly connected to have auxiliary relay 3, the output of auxiliary relay 3 is connected with the power negative pole.
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