CN220525982U - Single-phase grounding alarm device of low-voltage power supply system - Google Patents
Single-phase grounding alarm device of low-voltage power supply system Download PDFInfo
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- CN220525982U CN220525982U CN202321853500.0U CN202321853500U CN220525982U CN 220525982 U CN220525982 U CN 220525982U CN 202321853500 U CN202321853500 U CN 202321853500U CN 220525982 U CN220525982 U CN 220525982U
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Abstract
The utility model provides a single-phase grounding alarm device of a low-voltage power supply system, which comprises a low-voltage relay (KD) and a breaker switch (QF 1), wherein one end of a coil of the low-voltage relay (KD) is connected with a zero line in a bus, the other end of the coil of the low-voltage relay is grounded, one end of a normally open contact of the low-voltage relay (KD) is connected with a live wire (L), the other end of the normally open contact of the low-voltage relay is connected with an alarm bell (DL), and the other end of the alarm bell (DL) is connected with the zero line (N); one end of a fourth contact pair of the breaker switch (QF 1) is connected with a zero line in a bus, and the other end of the fourth contact pair is connected with a coil of the low-voltage relay (KD). The single-phase grounding alarm device has safe and reliable loop design, can meet the safety requirement of an underground explosive gas environment on a power supply, is convenient and quick to install on site, can give an audible and visual alarm to a single-phase grounding phenomenon at the first time, prompts professional technicians to maintain and treat a power supply system in time, and ensures underground electricity utilization safety.
Description
Technical Field
The utility model relates to the field of underground circuit safety detection, in particular to a single-phase grounding alarm device of a low-voltage power supply system.
Background
In recent years, along with the increase of mine exploitation scale and yield, a fully mechanized working face needs to adopt high-power electrical equipment to adapt to the rhythm of high yield and high efficiency, so that when a single-phase grounding fault occurs in a downhole low-voltage power supply system under the conditions of high load and downhole severe environment, the equipment can not only be unstable in operation, the normal production of a mine is affected, but also more importantly, personnel electric shock is easily caused, and serious safety accidents are caused.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides the single-phase grounding alarm device of the low-voltage power supply system, which can carry out audible and visual alarm on the single-phase grounding phenomenon at the first time and ensure the underground electricity utilization safety.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the single-phase grounding alarm device of the low-voltage power supply system comprises a relay, wherein one end of a coil of the relay is connected with a zero line in a bus, the other end of the coil of the relay is grounded, one end of a normally open contact of the relay is connected with a live wire (L), the other end of the normally open contact of the relay is connected with an alarm bell (DL), and the other end of the alarm bell (DL) is connected with a zero line (N); wherein the circuit breaker further comprises a circuit breaker switch (QF 1), and the circuit breaker switch (QF 1) comprises a first contact pair, a second contact pair, a third contact pair and a fourth contact pair; one end of a first contact pair, a second contact pair and a third contact pair of the breaker switch (QF 1) are respectively connected with a three-phase live wire in a bus, and the other end of the first contact pair, the second contact pair and the third contact pair are respectively connected with a load; one end of a fourth contact pair of the breaker switch (QF 1) is connected with a zero line in a bus, and the other end of the fourth contact pair is connected with a coil of the relay; the relay is a low voltage relay (KD).
Therefore, when any one of the low-voltage three-phase lines fails, the single-phase grounding alarm device of the low-voltage power supply system can give an audible and visual alarm to the single-phase grounding phenomenon at the first time, so that professional technicians are prompted to maintain and process the power supply system in time, and the underground electricity utilization safety is ensured.
When the three-phase live wire circuit has electric leakage, the zero wire is electrified, and when the induced voltage of the zero wire exceeds a set value, the power supply can be cut off in time through a breaker switch (QF 1), so that the loss caused by the single-phase grounding phenomenon is reduced, and the electricity safety is improved; the switch can be rapidly disconnected when the load loop is in electric leakage, and the damage to personnel and the adverse effect on electrical equipment when the load loop is in electric leakage are avoided.
Further, the circuit further comprises a power control switch (QF 2), wherein the power control switch (QF 2) comprises a first contact pair and a second contact pair; one end of a first contact pair of the power supply control switch (QF 2) is connected with a live wire (L), and the other end of the first contact pair is connected with a normally open contact of the low-voltage relay (KD); one end of the second contact pair of the power control switch (QF 2) is connected with a zero line (N), and the other end of the second contact pair is connected with the alarm bell (DL).
Therefore, the power supply can be cut off in time by arranging the power supply control switch (QF 2), and the safety requirement of the underground explosive gas environment on the power supply is met; in addition, when the fault is overhauled, the power supply control switch (QF 2) can be disconnected, so that a circuit of the alarm device is powered off, and an alarm signal is eliminated, so that a maintainer overhauls the fault point.
Compared with the prior art, the single-phase grounding alarm device has safe and reliable loop design and can adapt to the safety requirement of the underground explosive gas environment on the power supply; the on-site installation is convenient and quick, the single-phase grounding phenomenon can be subjected to audible and visual alarm at the first time, professional technicians are prompted to maintain and process the power supply system in time, and the underground electricity utilization safety is ensured.
In addition, the utility model reduces the loss caused by the single-phase grounding phenomenon and improves the electricity safety.
Finally, the utility model can rapidly break the switch when the electric leakage condition occurs, thereby reducing the potential safety hazard.
Drawings
FIG. 1 is a schematic diagram of an alarm circuit of the present utility model;
fig. 2 is a schematic diagram of a ground circuit of the present utility model.
KD-low voltage relay; DL-alarm bell; QF 1-breaker switch; QF 2-power control switch;
u, V, W-three-phase live wire; l-fire wire; n-zero line.
Detailed Description
Fig. 1 is a schematic diagram of an alarm circuit according to an embodiment, wherein a live line L and a neutral line N are taken and connected in series with a normally open contact of a low-voltage relay KD and an alarm bell DL.
It should be noted that, this embodiment also has provided power control switch QF2, can in time cut off the power, adapts to the safety requirement of having explosive gas environment to the power in the pit. The power control switch QF2 comprises a first contact pair and a second contact pair, the power control switch QF2 is connected in series with a normally open contact of the low-voltage relay KD and the alarm bell DL, a movable contact of the first contact pair of the power control switch QF2 is connected with the live wire L, and a movable contact of the second contact pair is connected with the zero line N. When the fault is overhauled, the power control switch QF2 can be disconnected, so that a circuit of the alarm device is powered off, and an alarm signal is eliminated, so that a maintainer overhauls the fault point.
Fig. 2 is a schematic diagram of a grounding circuit of an embodiment, in which a zero line N and a ground line of a main switch of a main power cabinet are connected in series with a coil of a voltage relay KD.
It should be noted that, in this embodiment, a breaker switch QF1 is further provided to control the power supply and the protection circuit. The breaker switch QF1 comprises a first contact pair, a second contact pair, a third contact pair and a fourth contact pair, one ends of the first contact pair, the second contact pair and the third contact pair of the breaker switch QF1 are respectively connected with a three-phase live wire U, V, W in a bus, the other ends of the first contact pair, the second contact pair and the third contact pair are respectively connected with a load, and the fourth contact pair is connected with a coil of the voltage relay KD in series. When the three-phase live wire circuit has electricity leakage, the breaker switch QF1 is disconnected, so that the power supply can be cut off in time, the loss caused by the single-phase grounding phenomenon is reduced, and the electricity safety is improved; the switch can be rapidly disconnected when the load loop is in electric leakage, and the damage to personnel and the adverse effect on electrical equipment when the load loop is in electric leakage are avoided.
By means of the circuit, when the three-phase live wire circuit has electric leakage, the zero line is electrified, and voltage is generated between the zero line and the ground; at this time, a voltage flows through the low-voltage relay, when the flowing voltage value is higher than a set value, a coil of the low-voltage relay KD is electrified, so that a normally open contact of the low-voltage relay KD is closed, an alarm bell DL is electrified, an audible and visual alarm is given to a single-phase grounding phenomenon at the first time, and before the voltage does not disappear, the normally open contact of the low-voltage relay KD is always in a closed state.
The triggering voltage value of the low-voltage relay is set to be 36V, namely when the zero line induction voltage reaches 36V, the coil of the low-voltage relay KD is electrified, so that the normally open contact of the low-voltage relay KD is closed, the alarm bell DL is electrified, the single-phase grounding phenomenon is subjected to audible and visual alarm at the first time, the live wire of a field person is prompted to have potential leakage hazards, and a professional technician is prompted to timely maintain and process a power supply system, so that the reliability, safety and continuity of the underground power supply system are improved.
The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are all within the scope of the present utility model.
Claims (2)
1. The single-phase grounding alarm device of the low-voltage power supply system comprises a relay, wherein one end of a coil of the relay is connected with a zero line in a bus and the other end of the coil of the relay is grounded, one end of a normally open contact of the relay is connected with a live wire (L), the other end of the normally open contact of the relay is connected with an alarm bell (DL), and the other end of the alarm bell (DL) is connected with a zero line (N), and the single-phase grounding alarm device is characterized by further comprising a breaker switch (QF 1), wherein the breaker switch (QF 1) comprises a first contact pair, a second contact pair, a third contact pair and a fourth contact pair; one end of a first contact pair, a second contact pair and a third contact pair of the breaker switch (QF 1) are respectively connected with a three-phase live wire in a bus, and the other end of the first contact pair, the second contact pair and the third contact pair are respectively connected with a load; one end of a fourth contact pair of the breaker switch (QF 1) is connected with a zero line in a bus, and the other end of the fourth contact pair is connected with a coil of the relay;
the relay is a low voltage relay (KD).
2. The low voltage power supply system single phase ground alarm device of claim 1, further comprising a power control switch (QF 2), the power control switch (QF 2) comprising a first contact pair, a second contact pair; one end of a first contact pair of the power supply control switch (QF 2) is connected with a live wire (L), and the other end of the first contact pair is connected with a normally open contact of the low-voltage relay (KD); one end of the second contact pair of the power control switch (QF 2) is connected with a zero line (N), and the other end of the second contact pair is connected with the alarm bell (DL).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321853500.0U CN220525982U (en) | 2023-07-14 | 2023-07-14 | Single-phase grounding alarm device of low-voltage power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321853500.0U CN220525982U (en) | 2023-07-14 | 2023-07-14 | Single-phase grounding alarm device of low-voltage power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220525982U true CN220525982U (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321853500.0U Active CN220525982U (en) | 2023-07-14 | 2023-07-14 | Single-phase grounding alarm device of low-voltage power supply system |
Country Status (1)
| Country | Link |
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| CN (1) | CN220525982U (en) |
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2023
- 2023-07-14 CN CN202321853500.0U patent/CN220525982U/en active Active
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