CN208350977U - Mutual inductor secondary polarity device for fast detecting - Google Patents

Abstract

The utility model relates to the technical field of polarity detection of transformers, and relates to a rapid detection device for secondary polarity of transformers, which comprises a time controller, a polarity display unit and a device power supply. The relay power supply is electrically connected to the time relay coil, the output end of the device power supply and the first terminal of the normally open contact of the time relay are all electrically connected to the primary side of the transformer under test through wires, and the input end of the device power supply is normally open to the time relay The second terminal of the contact is electrically connected, and the polarity display unit is electrically connected to the secondary side of the transformer under test. The utility model has a reasonable and compact structure, is easy to use, and can automatically output pulse current. Compared with the traditional detection method, the device has simple operation, intuitive display, can complete the test work by one person, and is safe, labor-saving, simple and efficient Features.

Description

Transformer Secondary Polarity Rapid Detection Device

technical field

The utility model relates to the technical field of polarity detection of transformers, which is a rapid detection device for secondary polarity of transformers.

Background technique

Whether it is a conventional substation or an intelligent substation, transformer equipment plays an important role. In electrical measurement and relay protection circuits, the function of voltage and current transformers is to supply secondary voltage and current for measurement and relay protection, which can not only be used to isolate primary equipment and secondary sides of power systems, but also It can also convert the primary side voltage and current into secondary voltage and current according to the transformer transformation ratio, which can be used by the secondary equipment in the station to realize the operation monitoring and protection functions of the power system. Therefore, whether the wiring of each current and voltage secondary circuit in the substation is correct has a direct impact on whether the substation equipment can operate reliably. At present, the secondary polarity verification of the transformer is still in the traditional test method, that is, artificial excitation is applied to the transformer on the primary side, and the signal is collected on the secondary side to determine the secondary polarity wiring. This method requires the cooperation of two workers at the same time, and the workload is large and safety hazards are prone to occur. Therefore, there is an urgent need to develop a rapid detection device for the secondary polarity of a transformer.

SUMMARY OF THE INVENTION

The utility model provides a rapid detection device for the secondary polarity of a transformer, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the problem that the prior measuring method requires at least two workers to operate at the same time, which is time-consuming and labor-intensive, and the construction efficiency is relatively high. Low workload, high workload and potential safety hazards.

The technical scheme of the present utility model is realized by the following measures: a rapid detection device for secondary polarity of a transformer includes a time controller, a polarity display unit, and a device power supply, and the time controller includes a time relay, a relay power supply, and a relay The power supply is electrically connected to the coil of the time relay, the output end of the device power supply and the first terminal of the normally open contact of the time relay are all electrically connected to the primary side of the transformer under test through wires, and the input end of the device power supply is in contact with the normally open contact of the time relay. Point the second terminal to be electrically connected, and the polarity display unit is electrically connected to the secondary side of the transformer under test.

The following are further optimizations or/and improvements to the above-mentioned technical solutions of the utility model:

The above-mentioned time controller also includes a control panel and a control switch for the relay power supply. The control panel is provided with a digital display, LED status indicator, and time adjustment buttons. The digital display, LED status indicator, and time adjustment buttons are all related to the time. The relay is electrically connected, and the control switch is electrically connected with the power supply of the relay.

The above also includes a housing, the time relay, the relay power supply, and the device power supply are all arranged in the housing, the control panel and the control switch are installed on the outer front of the housing, and the primary side of the tested transformer is electrically connected. The wires extend from the inside of the casing and out of the casing.

The above-mentioned measured transformer is a voltage transformer or a current transformer.

The above-mentioned polarity display unit is an ammeter, and the ammeter is connected to the secondary side of the transformer under test through a wire.

The power supply of the above device is a dry battery pack, and the power supply of the relay is a lithium battery.

The utility model has a reasonable and compact structure, provides a time controller capable of automatically outputting a pulse current by setting the working time of the time relay, and only needs one person to complete the detection of the secondary polarity of the transformer, and It greatly shortens the working time, avoids the occurrence of test errors, improves the reliability of power supply of equipment in the substation, and ensures the safe operation of the substation. It is safe, labor-saving, simple and efficient.

Description of drawings

Accompanying drawing 1 is the circuit connection diagram of the preferred embodiment of the utility model.

Fig. 2 is the operation flow chart of the preferred embodiment of the utility model.

_The codes in the accompanying drawings are respectively: U1 is the power supply _of the device, U2 is the power supply for the relay, KT is the coil _of the time relay, KT1 is the normally closed contact of the time relay, _KT2 is the normally open contact _of the time relay, and T1 is the _The primary side of the transformer under test, T2 is the secondary side of the transformer under test, ON is the button to turn on, OFF is the button to stop, and A is the ammeter.

Detailed ways

The present invention is not limited by the following examples, and specific implementations can be determined according to the technical solutions and actual conditions of the present invention.

Below in conjunction with embodiment and accompanying drawing, the utility model is further described:

As shown in FIG. 1 , the device for rapid detection of secondary polarity of a transformer includes a time controller, a polarity display unit, and a device power supply U ₁ . The time controller includes a time relay, a relay power supply U ₂ , and a relay power supply U 1 . ₂ is electrically connected to the time relay coil KT, the output end of the device power supply U1 and the _first terminal _of the time relay normally open contact _KT2 are all electrically connected to the primary side T1 _of the transformer under test through wires, and the device power supply U1 The input end is electrically connected to the _second terminal of the normally open contact of the time relay, and the polarity display unit is electrically connected to the secondary side T2 of the transformer under test.

In actual work, connect the other end of the wire on the first terminal of the normally open contact KT ₂ of the time relay in the casing to the first terminal of the primary side T ₁ of the transformer under test, and connect the wire connected to the casing. The other end of the wire on the output end of the power supply U1 _of the device is connected to the second terminal of the primary side T1 _of the transformer under test, and the positive and negative electrodes of the polarity display unit are respectively connected to the _second terminal of the secondary side T2 of the transformer under test. On the third terminal and the fourth terminal; the relay power supply U ₂ supplies power to the time relay coil KT. After the time relay coil KT is electrified, the time relay normally open contact KT ₂ is closed after the preset time "N seconds". The device power supply U ₁ supplies power to the primary side T ₁ of the transformer under test through the wire, and is converted into a small current on the secondary side through the transformation ratio of the transformer under test, and the secondary side T ₂ of the transformer under test is displayed through the display result of the polarity display unit Determine whether the secondary polarity is correct. Since the working time of the time relay can be preset, there is no need for two staff to operate at the same time, and one staff can measure the secondary polarity of the transformer under test on the secondary side, which greatly shortens the working time and avoids the occurrence of test errors. . The time relay here can be an electronic HFE10-2 type relay.

According to actual needs, the above-mentioned transformer secondary polarity rapid detection device can be further optimized or/and improved:

According to needs, the time controller also includes a control panel and a control switch for the relay power supply. The control panel is provided with a digital display, LED status indicator, and time adjustment buttons. The digital display, LED status indicator, and time adjustment buttons are all the same as _The time relay is electrically connected, and the control switch is electrically connected with the relay power supply U2. The control switch includes the "ON" button and the "OFF" stop button. The control panel is provided with a digital display, LED status indicator, and time adjustment buttons. The digital display shows the action time of the time relay. The LED status indicator has "Power". ", "Relay" two lights, time adjustment buttons include "Set", "+", "-". When the "ON" button is pressed, the relay power supply U ₂ is connected to the time relay coil KT coil circuit, the relay power supply U ₂ supplies power to the time relay coil KT, and the time relay enters the working state, press the "Set" key Select the working mode of the time relay, and increase or decrease the working time of the time relay by " ₊ " and "-"; The normally closed contact KT ₁ is disconnected, the power supply U ₁ of the device and the primary side circuit of the transformer are connected, and the time relay enters the self-circulating working mode; when the "OFF" stop button is pressed, the power supply U ₂ of the relay and the time are cut off. The connection of the relay coil KT, the time relay coil KT is not charged, the time relay normally open contact KT ₂ is disconnected, the time relay normally closed contact KT ₁ is closed, and the power supply U ₁ of the device and the primary side circuit of the transformer are cut off; "Power" For the relay power supply indicator, it is always on to indicate that the detection device is running; "Relay" is the status indicator of the time relay, only when the set time is over, the normally open contact KT ₂ of the time relay is closed, the "Relay" light is on, and then the light is off instantly. The working status of the time relay can be seen more intuitively from the control panel, and the staff can make adjustments at any time according to actual needs. The relay power supply control switch is convenient for on-site operation, and it does not require temporary wiring or battery insertion and removal, which ensures work efficiency.

According to requirements, the device for rapid detection of the secondary polarity of the transformer further includes a housing, the time relay, the relay power supply U ₂ , and the device power supply U ₁ are all arranged in the housing, and the control panel and the control switch are all installed in the housing On the outer front side, the wire electrically connected to the primary side T1 _of the transformer under test extends from the inside of the casing and out of the casing. The transformer secondary polarity rapid detection device is integrated in the shell, which is easy to carry. The components inside are fixed and installed, and the integration degree is high, which avoids the wiring errors that are easily caused by on-site wiring. The shell is made of a material with a smooth surface, good thermal stability and not easy to deform, and an aluminum alloy can be selected as the device shell.

As shown in FIG. 1 , the tested transformer is a voltage transformer or a current transformer. The device for rapid detection of the secondary polarity of the transformer can detect the polarity of the secondary side of the voltage transformer or the current transformer.

As shown in FIG. 1 , the polarity display unit is an ammeter A, and the ammeter is connected to the secondary side T ₂ of the transformer under test through a wire. The positive and negative electrodes of the ammeter _A are respectively connected to the third and fourth terminals of the secondary side T2 of the transformer under test through wires. The primary side circuit of the transformer passes through the transformer ratio, and the secondary side current is small. The ammeter A here is a milliamp ammeter A, and the milliamp ammeter can more intuitively observe the pointer deviation.

As shown in FIG. ₁ , the device power supply U1 is a dry battery pack, and the relay power supply _U2 is a lithium battery. _The device power supply U1 provides working power for the detection device. _The device power supply U1 can be selected from _a dry battery commonly used in the market, and the relay power supply U2 can supply power to the time relay coil, and a rechargeable lithium battery can be selected.

The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and can increase or decrease unnecessary technical features according to actual needs to meet the needs of different situations.

The use process of the preferred embodiment of the present utility model: firstly, connect the two wires extending out of the casing from the casing to the _first terminal and the second terminal of the primary side T1 of the transformer under test, and connect the positive pole of the ammeter A. , The negative lead of the ammeter _A is connected to the third and fourth terminals of the secondary side T2 of the transformer under test _; then, press the switch "ON" button of the relay power supply U2, and the relay KT coil is charged at this time. The "Power" light is always on; press the "Set" key to set the time relay working mode, and use the "+" and "-" keys to set the time relay working time "N seconds"; after "N seconds", the time relay is normally open and touch Point KT ₂ is closed, the power supply U ₁ of the device and the primary side circuit of the transformer are closed and energized, the power supply U ₁ of the device supplies power to the circuit, the primary side T ₁ of the transformer generates current, the "Relay" light flashes, and the time relay automatically circulates to generate pulse current. , through the transformation ratio of the transformer under test, it is converted into a small current on the secondary side, and on the secondary winding side, the direction of the pointer of the ammeter A can be used to judge whether the secondary polarity is correct. The polarity of T ₂ is correct. If the pointer of the ammeter A is reversed, it means that the polarity of T ₂ on the secondary side of the transformer is wrong.

Claims (9)

1. a kind of transformer secondary polarity fast detection device, it is characterized in that comprising time controller, polarity display unit, device power supply, time controller comprises time relay, relay power supply, and relay power supply is electrically connected with time relay coil , the output end of the power supply of the device and the first terminal of the normally open contact of the time relay are all electrically connected to the primary side of the transformer under test through a wire, and the input end of the power supply of the device is electrically connected to the second terminal of the normally open contact of the time relay, The polarity display unit is electrically connected with the secondary side of the transformer under test. 2. The device for rapidly detecting the secondary polarity of a transformer according to claim 1, wherein the time controller also comprises a control panel, a control switch of the relay power supply, and the control panel is provided with a digital display screen, an LED status indicator , Time adjustment button, digital display, LED status indicator, time adjustment button are all electrically connected with the time relay, and the control switch is electrically connected with the relay power supply. 3. The device for rapidly detecting the secondary polarity of a transformer according to claim 2, characterized in that it further comprises a housing, and the time relay, the relay power supply and the device power supply are all arranged in the housing, and the control panel, the control The switches are all installed on the front side of the outer side of the casing, and the wires electrically connected to the primary side of the transformer under test extend from the casing to the outside of the casing. 4 . The device for rapidly detecting the secondary polarity of a transformer according to any one of claims 1 to 3 , wherein the detected transformer is a voltage transformer or a current transformer. 5 . 5. The device for rapidly detecting the secondary polarity of a transformer according to any one of claims 1 to 3, wherein the polarity display unit is an ammeter, and the ammeter is connected to the secondary side of the transformer under test through a wire. 6 . The device for rapidly detecting the secondary polarity of a transformer according to claim 4 , wherein the polarity display unit is an ammeter, and the ammeter is connected to the secondary side of the transformer under test through a wire. 7 . 7. The device for rapidly detecting the secondary polarity of a transformer according to claim 1, 2, 3 or 6, characterized in that the device power source is a dry battery pack, and the relay power source is a lithium battery. 8 . The device for rapid detection of secondary polarity of a transformer according to claim 4 , wherein the power supply of the device is a dry battery pack, and the power supply for the relay is a lithium battery. 9 . 9 . The device for rapidly detecting the secondary polarity of a transformer according to claim 5 , wherein the power supply of the device is a dry battery pack, and the power supply for the relay is a lithium battery. 10 .