CN211293085U - Distribution transformer platform district three-phase load heavy unbalance alarm - Google Patents
Distribution transformer platform district three-phase load heavy unbalance alarm Download PDFInfo
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- CN211293085U CN211293085U CN201921148492.3U CN201921148492U CN211293085U CN 211293085 U CN211293085 U CN 211293085U CN 201921148492 U CN201921148492 U CN 201921148492U CN 211293085 U CN211293085 U CN 211293085U
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Abstract
The utility model relates to a distribution transformer platform district three-phase load heavy unbalance alarm, this alarm includes: the three-phase open-delta residual voltage sampling circuit comprises three sampling coils arranged on a three-phase line, and a three-phase open-delta residual voltage acquisition device, a bridge shaping circuit, a filter circuit, a voltage stabilizing circuit and an alarm circuit which are sequentially connected. The utility model discloses can directly articulate on three-phase line, can in time send the unbalanced warning of three-phase load, the staff in time adjusts the load according to the alarm, avoids the emergence or the expansion of accident.
Description
Technical Field
The utility model relates to a transformer operation protection and low pressure distribution lines operation protection especially relate to a distribution transformer platform district three-phase load severe unbalance alarm.
Background
A large number of three-phase four-wire connection modes exist in cities and countryside of China, and the distribution transformer is in a Yyn0 connection mode, so that a large number of single-phase user loads exist, and actually, unbalanced operation of three-phase loads is inevitable. When three-phase load is not balanced, the transformer is burnt and serious accidents of distribution lines are caused very possibly.
The existing methods for solving the problem of three-phase load imbalance are classified into two categories:
one is manual regulation, which transfers part of the load to one or two other phases when one phase of the three-phase load with a large current is sensed or detected. The problems with this approach are: firstly, the unbalanced state of the three-phase load cannot be found in time, so that the dangerous state cannot be relieved in time; and secondly, even if the three phases are found to be unbalanced, the three phases cannot be adjusted to be basically balanced, because only the three-phase load imbalance can be known in a mode of monitoring the current of the zero line, but which phase of load is too large or too small cannot be known, and therefore adjustment is blind. The only advantage of this method is that there is no additional equipment cost, other than the current clamp meter.
Another type is an automatic adjustment system. For 1 distribution transformer platform district, need 1 total control terminal at least, need 6 ~ 12 commutation switches moreover at least. This system not only needs to configure the automatic phase change switch and its control terminal equipment, but also needs communication system between the phase change switch and its control terminal. The problems with this approach are: the system has the advantages of high cost, high installation and maintenance cost and the unique advantage of being capable of automatically adjusting the load, and is easy to influence the normal operation of a line, interfere the normal work of the power consumption information acquisition system and cause power failure accidents of users.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing a distribution transformer platform district three-phase load heavy unbalance alarm to the defect among the prior art.
The utility model provides a technical scheme that its technical problem adopted:
a distribution transformer platform district three-phase load heavy unbalance alarm includes: the three-phase sampling hollow coil and the alarm circuit are arranged on a three-phase line, and the alarm circuit comprises a three-phase open triangular residual voltage acquisition device, a bridge shaping circuit, a filter circuit, a voltage stabilizing circuit and an alarm circuit which are sequentially connected;
the three sampling hollow coils are respectively arranged on three phase lines and used for collecting three alternating current induction line currents iu、iv、iwAccording to the electromagnetic induction principle, three alternating current induced electromotive forces e are excitedu、ev、 ewAnd generates three AC induction voltages uu、uv、uw；
The open-delta residual voltage acquisition device is connected with the three sampling hollow coils through cables, and a difference alternating voltage u is obtained at the opening of the open-delta coiloWherein u iso＝uu+uv+uw；
The bridge shaping circuit is a full-wave bridge shaping circuit consisting of 4 shaping diodes D1, D2, D3 and D4;
the difference alternating voltage u is converted into a voltage by a bridge shaping circuit and a filter circuitoInto a differential DC voltage U0；
The voltage stabilizing circuit is a three-end adjustable integrated voltage stabilizing circuit, and the voltage stabilizing circuit further comprises an alarm threshold value for adjusting the three-phase load unbalance degree and a potentiometer R for adjusting the sound and light intensity of the alarmp；
The alarm circuit comprises a microswitch S and an intelligent audible and visual alarm RL。
According to the scheme, the sampling coil is an open-close type Rogowski coil.
According to the scheme, the open triangle residual voltage acquisition device comprises three induction coils with the same polarity end in sequence.
According to the scheme, the voltage stabilizing circuit is a three-end adjustable CW78M integrated voltage stabilizing circuit.
According to the scheme, the filter circuit is a pi-shaped filter circuit comprising two capacitors and a resistor.
The utility model discloses the beneficial effect who produces is:
1. open-close type Rogowski hollow acquisition (non-ferromagnetic material) coil R with non-magnetic wire framework flexible designU、 RV、RWAnd an ultra-long induction voltage information transmission cable LU、LV、LWThe device is suitable for any narrow part and long-distance hanging;
2. a three-phase open type triangular residual voltage acquisition device delta U is used for skillfully acquiring a required signal driving difference value direct current voltage Uo of a subsequent circuit;
3. the debugging is not needed in the operation, and before delivery, the acousto-optic alarm threshold is debugged and verified by regulating the three-terminal (output voltage/alarm threshold) adjustable integrator CW78M and the potentiometer Rp in the voltage stabilizing circuit thereof according to the regulations;
and 4, the signal acquired by the Rogowski acquisition coil is the line current of a three-phase line, and the output induced voltage overcomes the technical obstacles of inconvenient acquisition and processing and the like caused by the current output of the current transformer.
5. Only when the three-phase load unbalance degree exceeds a set value, namely the severe unbalance is caused, the audible and visual alarm R is usedLAlarming to remind related personnel to transfer load; alarm deviceThe load can be adjusted in a targeted manner by using the ammeter. To avoid audible and visual interference, the alarm can be switched off by means of the switch S
6. The alarm device is not required to be installed, namely, the alarm device can be used after being hung, the placing position or the placing space is not limited, and the installation wiring and the operation and maintenance cost are avoided;
7. the alarm device works independently, does not affect the work of any equipment or system on a line, and further does not cause power failure accidents.
8. The utility model relates to a principle is simple, has abandoned complicated comparison circuit, amplifier circuit, modem circuit, has been used for internal logic control and data processing's little the control unit, loaded down with trivial details communication system and expensive remote control mode, and a transformer platform district only needs an alarm, safety and stability and low cost.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
As shown in fig. 1, a distribution transformer platform district three-phase load heavy unbalance alarm comprises: the three-phase open triangular residual voltage sampling device comprises three sampling hollow coils arranged on a three-phase line, and a three-phase open triangular residual voltage sampling device, a bridge shaping circuit, a filter circuit, a voltage stabilizing circuit and an alarm circuit which are sequentially connected;
three sampling hollow coils which are hung on a three-phase line are open-close type flexibly-processed coreless Rogowski hollow coils, and the other ends of the wires are connected with a three-phase open-delta residual voltage acquisition device through an ultra-long voltage signal transmission cable;
the three sampling hollow coils respectively sample on three phase linesCurrent i collected in three ac induction linesu、iv、 iwThen, according to the electromagnetic induction principle, three AC induced electromotive forces e are excitedu、ev、ewAfter passing through the open triangular residual voltage acquisition device, the three alternating current induced electromotive forces generate three alternating current induced voltages uu、uv、uwAnd obtaining a differential AC voltage u at the opening of the open triangular coilo＝uu+uv+uw；
Bridge shaping circuit and filter circuit for converting the difference AC voltage uoInto a differential DC voltage U0；
The voltage stabilizing circuit is a three-end adjustable CW78M (LM317) integrated voltage stabilizing circuit, and the voltage stabilizing circuit further comprises an alarm threshold value for adjusting the three-phase load unbalance degree and a potentiometer R for adjusting the sound and light intensity of the alarmp(ii) a The filter circuit is a pi-shaped filter circuit including two capacitors and an inductor.
The alarm circuit comprises a microswitch S and an intelligent audible and visual alarm RLOnly when the three-phase load unbalance degree exceeds a specified value, namely the three-phase load unbalance degree is severely unbalanced, the audible and visual alarm R is usedLAlarming to remind related personnel to transfer load; when alarming, the load can be adjusted in a targeted manner by using the ammeter. To avoid audible and visual disturbances, the alarm can also be switched off by means of the switch S.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (6)
1. Distribution transformer platform district three-phase load heavy unbalance alarm, its characterized in that includes: the three-phase sampling hollow coil and the alarm circuit are arranged on a three-phase line, and the alarm circuit comprises a three-phase open triangular residual voltage acquisition device, a bridge shaping circuit, a filter circuit, a voltage stabilizing circuit and an alarm circuit which are sequentially connected;
the three sampling hollow coils are respectively arranged on three phase lines and used for collecting three alternating current induction line currents iu、iv、iwAccording to the electromagnetic induction principle, three corresponding AC induced electromotive forces e are excitedu、ev、ewAnd generates three AC induction voltages uu、uv、uw；
The open-delta residual voltage acquisition device is connected with the three sampling hollow coils through cables, and a difference alternating voltage u is obtained at the opening of the open-delta coilo；
The bridge shaping circuit is a full-wave bridge shaping circuit consisting of 4 shaping diodes D1, D2, D3 and D4;
the voltage stabilizing circuit is a three-terminal adjustable integrated voltage stabilizing circuit;
the alarm circuit comprises a microswitch S and an intelligent audible and visual alarm RL。
2. The distribution transformer station area three-phase load heavy unbalance alarm according to claim 1, wherein the sampling hollow coil is an open-close type rogowski coil.
3. The alarm of claim 1, wherein the open triangle residual voltage collecting device comprises three induction coils with like polarity ends connected in series.
4. The alarm of claim 1, wherein the regulator circuit is a CW78M type three-terminal adjustable integrated regulator circuit.
5. The distribution transformer station area three-phase load heavy unbalance alarm device according to claim 1, wherein the voltage stabilizing circuit further comprises an alarm threshold for adjusting the three-phase load unbalance degree and a potentiometer for adjusting the sound and light intensity of the alarm device.
6. The distribution transformer station three-phase load heavy imbalance alarm of claim 1, wherein the filter circuit is a pi-shaped filter circuit comprising two capacitors and one resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921148492.3U CN211293085U (en) | 2019-07-19 | 2019-07-19 | Distribution transformer platform district three-phase load heavy unbalance alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921148492.3U CN211293085U (en) | 2019-07-19 | 2019-07-19 | Distribution transformer platform district three-phase load heavy unbalance alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211293085U true CN211293085U (en) | 2020-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921148492.3U Active CN211293085U (en) | 2019-07-19 | 2019-07-19 | Distribution transformer platform district three-phase load heavy unbalance alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211293085U (en) |
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2019
- 2019-07-19 CN CN201921148492.3U patent/CN211293085U/en active Active
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