CN204789863U - Combined current and potential transformer polarity test device - Google Patents

Abstract

The utility model relates to a combined current and potential transformer polarity test device belongs to the technical field that mutual inductor polarity tested, the problem of the technique is solved for: the utility model provides a test accuracy is high, the interference killing feature is strong, and can be at the dark condition measuring combined current and potential transformer polarity test device of the on -the -spot light of test, the technical scheme who adopts does: a combined current and potential transformer polarity test device, includes: power U1, switch K1, emitting diode D1, emitting diode D2 and have the the direction of current flow response module of display screen, power U1's positive pole concatenates behind the switch K1 and to link to each other with combined current and potential transformer T1's once side binding post A1, power U1's negative pole links to each other with the once side binding post A2 of the the direction of current flow who has display screen response module, be applicable to electric power system technical field.

Description

A current and voltage transformer polarity testing device

technical field

The utility model relates to a current and voltage transformer polarity testing device, which belongs to the technical field of transformer polarity testing.

Background technique

Potential transformer (PT) and current transformer (CT) are important electrical equipment in the power system. They are responsible for the isolation between high and low voltage systems and the conversion of high voltage to low voltage. They are installed, accepted and technically upgraded in substations. During work, the checking of the polarity of the transformer is an essential part of the relay protection staff. The wrong connection of the polarity can cause the measurement and metering device to fail to read the data correctly, and it can also cause the protection to refuse to operate or malfunction. Therefore, The transformer polarity test is of great significance to the power system.

There are two commonly used methods for testing the polarity of transformers. The first is to use a comprehensive transformer tester. The main function of this instrument is to use CT ratio test and output large current. The large coil inside the instrument leads to a large overall volume of the instrument. , heavy weight, in addition to complex wiring, cumbersome operation, poor anti-interference ability, error-prone, etc., even in the face of some special working environments, it cannot be used normally. If the polarity of the transformer is simply tested, these problems will be solved to a certain extent. It affects the work efficiency of relay protection workers and delays the power transmission time of the substation; the second method is to use the characteristic that the primary current of the transformer flows in from the polarity end and the secondary current flows out from the polarity end, and the pointer multimeter red , Connect the black test lead line into the secondary circuit of the transformer, set the multimeter to the DC voltage level, and then connect the negative pole of a dry battery to the primary non-polar terminal terminal of the transformer, and then use the positive pole of the dry battery to "point" The terminal of the primary polarity terminal of the transformer. At this time, the primary flow of the transformer flows into the forward current from the polarity terminal to the non-polarity terminal. Observe the pointer offset direction of the pointer multimeter. If the pointer deviates from 0 to the right, the multimeter’s The red test lead is connected to the secondary polarity end of the transformer, and the black test lead is connected to the secondary non-polar end of the transformer. This wiring is called "positive polarity". If the pointer deviates from 0 to the left, the multimeter The red test lead is connected to the secondary non-polar end of the transformer, and the black test lead is connected to the secondary polar end of the transformer. This wiring is called "negative polarity". This method requires 2-3 people to connect at the same time. Cooperate, the degree of cooperation to the test personnel is high, in the prior art, there are problems such as time-consuming, laborious, poor anti-interference ability, difficult to operate, and cannot be used in the dark conditions of the test site when testing the polarity of the transformer.

Utility model content

The present invention overcomes the deficiencies in the prior art, and the technical problem to be solved is: to provide a current and voltage transformer polarity test device with high test accuracy and strong anti-interference ability, and which can be measured under the dark conditions of the test site .

In order to solve the above technical problems, the technical solution adopted by the present invention is: a current and voltage transformer polarity test device, including: power supply U1, switch K1, light emitting diode D1, light emitting diode D2 and a current direction sensing module with a display screen , the positive pole of the power supply U1 is connected in series with the switch K1 and connected to the primary terminal A1 of the current and voltage transformer T1, the negative pole of the power supply U1 is connected to the primary terminal A2 of the current and voltage transformer T1, and the light emitting diode D1, light emitting diode D2 and current direction sensing module are respectively connected in parallel between the secondary side connection terminal B1 and the secondary side connection terminal B2 of the current voltage transformer T1, the negative pole of the light emitting diode D1 is connected to the positive pole of the light emitting diode D2 Connect to terminal B1 on the secondary side.

The device also includes a pointer ammeter S1, the pointer ammeter S1 is connected in parallel between the secondary side connection terminal B1 and the secondary side connection terminal B2 of the current voltage transformer T1, the switch K1 is a wireless remote control switch, The wireless remote control switch is wirelessly connected to a remote control transmitter for transmitting coded frequencies, the switch K1 is a manual switch, the light emitting diode D1 is a red light emitting diode, the light emitting diode D2 is a green light emitting diode, and the display screen is LCD.

Compared with the prior art, the present invention has the following beneficial effects:

The utility model is a device for testing the polarity of a current and voltage transformer. During the test, the light-emitting diode D1 and the light-emitting diode D2 use the principle of diode forward conduction. When the test result is positive, the light-emitting diode D1 is turned on, and the red light is on. When the test result is negative polarity, the light-emitting diode D2 is turned on, and the green light is on; when the current direction sensing module is testing, the sensed test results can be displayed on the liquid crystal display, and the liquid crystal display will light up when it is working normally. In addition, this practical The new type also includes the pointer ammeter S1, through the forward and reverse rotation of the pointer ammeter S1, it indicates that the sensed test results are positive polarity and negative polarity; the three test methods are measured at the same time to ensure the accuracy of the test, and in the field light It can also be used under dark conditions, which greatly facilitates the staff. The whole device has simple wiring, simple operation, and strong anti-interference ability, which improves the work efficiency of the staff and saves the power transmission time of the substation.

Description of drawings

Below in conjunction with accompanying drawing, the present invention is described in further detail;

Fig. 1 is the structural representation of the utility model;

In the figure: 1 is the current direction sensing module, 2 is the remote control transmitter.

Detailed ways

As shown in Fig. 1, a kind of current voltage transformer polarity testing device comprises: power supply U1, switch K1, light-emitting diode D1, light-emitting diode D2 and the current direction sensing module 1 with display screen, the anode of described power supply U1 The switch K1 is connected in series with the primary side terminal A1 of the current and voltage transformer T1, the negative pole of the power supply U1 is connected with the primary side terminal A2 of the current and voltage transformer T1, the light emitting diode D1, the light emitting diode D2 and the current The direction sensing module 1 is respectively connected in parallel between the secondary side terminal B1 and the secondary side terminal B2 of the current and voltage transformer T1. When the current direction sensing module 1 is testing, the sensed test results can be displayed on the liquid crystal display. , the display screen will light up during normal operation, and it can also be used under the condition of dark light on site, and the cathode of the light-emitting diode D1 and the anode of the light-emitting diode D2 are both connected to the secondary terminal B1.

The device also includes a pointer ammeter S1, the pointer ammeter S1 is connected in parallel between the secondary side connection terminal B1 and the secondary side connection terminal B2 of the current voltage transformer T1, the forward rotation and reverse rotation of the pointer ammeter S1 The test results sensed respectively are positive polarity and negative polarity. The switch K1 is a wireless remote control switch. The light-emitting diode D1 is a red light-emitting diode, and the light-emitting diode D2 is a green light-emitting diode. During the test, the light-emitting diode D1 and the light-emitting diode D2 use the principle of diode forward conduction. When the test result is positive, the light-emitting diode D1 is turned on, and the red The light is on, and when the test result is negative polarity, the light-emitting diode D2 is turned on, and the green light is on, and the display screen is a liquid crystal display screen.

The utility model is a current and voltage transformer polarity test device, which provides a current and voltage transformer polarity test device with high test accuracy and strong anti-interference ability, and can be measured in the dark condition of the test site. Features and progress; above in conjunction with the accompanying drawings, the embodiments of the present utility model have been described in detail, but the present utility model is not limited to the above-mentioned embodiments, within the scope of knowledge possessed by those of ordinary skill in the art, it can also be used without departing from the present utility model. Various changes are made under the premise of the new purpose.

Claims (7)

1. A current and voltage transformer polarity testing device, characterized in that: comprising: a power supply U1, a switch K1, a light-emitting diode D1, a light-emitting diode D2 and a current direction sensing module (1) with a display screen, the power supply U1 The positive electrode of the power supply U1 is connected to the primary side terminal A1 of the current and voltage transformer T1 after being connected in series with the switch K1, the negative pole of the power supply U1 is connected to the primary side terminal A2 of the current and voltage transformer T1, and the light emitting diode D1, light emitting diode D2 and the current direction sensing module (1) are connected in parallel between the secondary side connection terminal B1 and the secondary side connection terminal B2 of the current voltage transformer T1, and the negative pole of the light emitting diode D1 and the positive pole of the light emitting diode D2 are both connected to the two Connect to terminal B1 on the secondary side. 2. A current and voltage transformer polarity test device according to claim 1, characterized in that: said device also includes a pointer ammeter S1, said pointer ammeter S1 is connected in parallel to the two ends of the current and voltage transformer T1 Between secondary terminal B1 and secondary terminal B2. 3. A current and voltage transformer polarity test device according to claim 1, characterized in that: the switch K1 is a wireless remote control switch, and the wireless remote control switch communicates with the remote control transmitter (2) for transmitting coded frequencies Wireless connections. 4. A current and voltage transformer polarity testing device according to claim 1, characterized in that: said switch K1 is a manual switch. 5. A current and voltage transformer polarity testing device according to claim 1, characterized in that: the light emitting diode D1 is a red light emitting diode. 6. A current and voltage transformer polarity testing device according to claim 1, characterized in that: the light emitting diode D2 is a green light emitting diode. 7. A current and voltage transformer polarity testing device according to claim 1, wherein the display screen is a liquid crystal display screen.