CN203101622U - Testing system for 220 V output voltage multi-output voltage mutual inductor - Google Patents

Abstract

The utility model relates to a multi-output voltage transformer testing system with 220V output voltage, which is composed of an automatic voltage regulating transformer, an automatic control and switching circuit, a first load box, a second load box and a transformer calibrator; One output terminal of the automatic control circuit in the automatic control and switching circuit is connected to the control terminal of the automatic voltage regulating transformer, and the output terminal of the automatic voltage regulating transformer is connected to the primary stage of the multi-output voltage transformer under test, and the multi-output voltage transformer under test The secondary windings of each are connected to the automatic switching circuit in the automatic control and switching circuit, and the first load box and the second load box are respectively bidirectionally connected to the multi-output voltage transformer under test. The utility model has the advantages that it can automatically test the multi-output voltage transformer with 220V output voltage, can automatically switch between multiple output terminals, and has a simple use method and accurate and reliable test data.

Description

A 220V output voltage multi-output voltage transformer testing system

technical field

The utility model relates to a multi-output voltage transformer testing system with 220V output voltage.

Background technique

The secondary voltage of the current transformer test system is V, 100V, maximum 150V, and only single-channel test can be performed. For multi-output voltage transformers, different secondary test circuits need to be manually connected. There is no multi-output automatic switching and the secondary output voltage can reach 220V. Transformer test system.

The power supply voltage of the single-phase smart meter is 220V, and its test device is generally multi-meter, 24-meter or 48-meter, and the voltage transformer with the secondary voltage of 24 or 48 outputs is used to supply power to each meter. The input voltage is also 220V. The measurement accuracy of the multi-output voltage transformer is related to the detection accuracy of the smart energy meter, and its accuracy needs to be guaranteed through regular detection. This type of voltage transformer is used in the metering centers of power supply companies in various provinces and cities with smart meter detection devices, and it involves a wide range of areas.

V，因此互感器测试系统能够测试的二次电压也是100V或者

V，最大为150V，不能够对智能电表检测装置中的输出电压为220V的电压互感器进行误差测试，也就无法保证智能电表检测装置的准确性。 The secondary output voltage of the general voltage transformer is 100V or

V, so the secondary voltage that the transformer test system can test is also 100V or

V, the maximum is 150V, and the error test of the voltage transformer with an output voltage of 220V in the smart meter detection device cannot be performed, and the accuracy of the smart meter detection device cannot be guaranteed.

Utility model content

The technical problem to be solved by the utility model is to provide a multi-output voltage transformer testing system with 220V output voltage.

The technical solution adopted by the utility model to solve its technical problems:

The utility model is composed of an automatic voltage regulating transformer, an automatic control and switching circuit, a first load box, a second load box and a transformer calibrator; one output terminal of the automatic control circuit in the automatic control and switching circuit is automatically connected The control terminal of the voltage regulating transformer, the output terminal of the automatic voltage regulating transformer is connected to the primary of the measured multi-output voltage transformer, and the secondary windings of the measured multi-output voltage transformer are connected to the automatic control and switching circuit. Switching circuit, the first load box and the second load box are respectively bidirectionally connected with the multi-output voltage transformer under test, the multi-output voltage transformer under test is bidirectionally connected with the transformer calibrator, and the automatic control and switching The circuit is bidirectionally connected with the transformer calibrator.

This system improves the common transformer calibrator so that it can test the error data of the multi-output transformer with a rated voltage of 220V, and improves the load box of a common voltage transformer so that it can be used as a test for a 220V rated voltage transformer. load box. The automatic control and switching circuit is used to control the switching between the automatic voltage regulating transformer and the secondary windings of the tested multi-output voltage transformer, and the automatic test of the error accuracy of each output winding of the multi-output voltage transformer with a rated voltage of 220V is realized. Function. The utility model only needs to compare the errors between the standard meter windings and the output windings of the measured multi-output voltage transformer.

The beneficial effects of the utility model are as follows:

(1) It can automatically test the multi-output voltage transformer with 220V output voltage, and can automatically switch between multiple output terminals.

(2) The method of use is simple, and the test data is accurate and reliable.

Description of drawings

Fig. 1 is a functional block diagram of the utility model.

Figure 2 is a schematic diagram of the automatic control and switching circuit.

Fig. 3 is a schematic diagram of the switching circuit of the normally open contacts of the relays J1-Jn of the automatic switching circuit.

Figure 4 is a schematic diagram of the internal circuit of the HEF-H transformer calibrator.

Figure 5 is a schematic diagram of the internal circuit of the Fy50 load bank (except for the autotransformer B1).

Fig. 6 is a logic function diagram of the utility model.

Detailed ways

As can be seen from the embodiment described in Fig. 1-Fig. 6, it is composed of an automatic voltage regulating transformer 1, an automatic control and switching circuit 2, a first load box 3, a second load box 4 and a transformer calibrator 5; One output terminal of the automatic control circuit in the automatic control and switching circuit is connected to the control terminal of the automatic voltage regulating transformer 1, and the output terminal of the automatic voltage regulating transformer 1 is connected to the primary stage of the measured multi-output voltage transformer 6, and the measured multi-output The secondary windings of the voltage transformer 6 are connected to the automatic switching circuit in the automatic control and switching circuit 2, and the first load box 3 and the second load box 4 are bidirectionally connected with the measured multi-output voltage transformer 6 respectively, The tested multi-output voltage transformer 6 is bidirectionally connected to the transformer calibrator 5 , and the automatic control and switching circuit 2 is bidirectionally connected to the transformer calibrator 5 .

Described automatic control and switching circuit 2 are made up of automatic control circuit and automatic switching circuit, and automatic control circuit is made up of single-chip microcomputer U1 and its peripheral element crystal y0, capacitor C1-C2, stepping motor drive chip U2;

The input terminal of the stepper motor driver chip U2 is connected to the PB0-PB5 mouth of the single-chip microcomputer U1; the SDA port and the SDL mouth of the single-chip microcomputer U1 are respectively connected to the corresponding input terminals of the instrument transformer calibrator 5;

The automatic switching circuit is composed of transistors VT1-VTn, relays J1-Jn, freewheeling diodes D1-Dn, and resistors R1-Rn; the bases of transistors VT1-VTn are respectively connected to PA0-PAn ports of single-chip microcomputer U1 through resistors R1-Rn , The relays J1-Jn are respectively connected between the collectors of the transistors VT1-VTn and the ground.

One end of the normally open contact J1-1-Jn-1 of the relay J1-Jn is connected to pin 1 of the transformer calibrator 5, and the other end is respectively connected to the secondary winding of the measured multi-output voltage transformer 6 in turn. One end of L1—Ln, the other end of the secondary winding L1—Ln of the multi-output voltage transformer 6 to be tested are all connected to pin 4 of the transformer calibrator 5;

The connecting terminals M and N of the first load box 3 are connected to both ends of the secondary winding L0 of the multi-output voltage transformer 6 to be tested, and one end of the secondary winding L0 is connected to pin 4 of the transformer calibrator 5 , the other end of which is respectively connected to pin 2 and pin 3 of transformer calibrator 5;

The connection terminal M of the second load box 4 is connected to the common connection end of the secondary winding of the measured multi-output voltage transformer 6, and the connection terminal N of the second load box 4 is connected to the normally open contact J1-1 - the public connection ends of Jn-1 are connected;

Pins 1 and 2 of the transformer calibrator 5 are error input terminals ΔU; pins 3 and 4 of the transformer calibrator 5 are standard voltage input terminals Up.

The model of the single-chip microcomputer U1 is Atmega16, and the model of the stepper motor driver chip U2 is L298N.

The model of the transformer calibrator 5 is HEF-H, and the transformation ratio of the secondary step-down transformer Tp is changed to 2.2 times of the original transformation ratio, and the resistance value of the conversion resistance R _U is changed to the original resistance value 2.2 times.

The model of the first load box 3 and the second load box 4 is Fy50, and a 220/110V autotransformer B1 is connected to the input terminal of the first load box 3 and the second load box 4 .

The automatic voltage regulating transformer 1 is an automatic voltage regulating transformer controlled by a stepping motor.

In Figure 4, T _B is an auxiliary voltage transformer, K1 and K2 are single-pole double-throw switches, T is a transformer, and its secondary winding is connected to an AC zero indicator D. G is the adjustable conductance box, C is the adjustable capacitance box; R _U is the conversion resistance, K and D are the difference measuring terminals.

In Fig. 5, r10-rn0 is a resistor, r1-rn is a resistor, L10-Ln0 is an inductor, and K10-Kn0 is a single-pole double-throw switch.

In Fig. 6, the system sends a control signal to the stepping motor in the automatic voltage regulating transformer 1, drives the power supply to boost, and monitors the boosting situation through the transformer calibrator 5, and according to the voltage transformer verification regulations, at the rated voltage 80%, 100%, and 120% read the error data measured by the transformer calibrator 5 and record it. After the error test of the primary winding is completed, the automatic voltage regulating transformer 1 is controlled to step down, and a control command is sent to the automatic switching circuit to switch the test channel to the next secondary winding of the multi-output voltage transformer to be tested, and the error test process is repeated. Until the test of all secondary windings of the multi-output voltage transformer under test is completed.

Claims (7)

1. A multi-output voltage transformer testing system with 220V output voltage is characterized in that it consists of an automatic voltage regulating transformer (1), an automatic control and switching circuit (2), a first load box (3), and a second load box ( 4) Composed of a transformer calibrator (5); one output terminal of the automatic control circuit in the automatic control and switching circuit is connected to the control terminal of the automatic voltage regulating transformer (1), and the output of the automatic voltage regulating transformer (1) The terminal is connected to the primary of the multi-output voltage transformer (6) under test, and the secondary windings of the multi-output voltage transformer under test (6) are connected to the automatic switching circuit in the automatic control and switching circuit (2), so The first load box (3) and the second load box (4) are respectively bidirectionally connected to the tested multi-output voltage transformer (6), and the tested multi-output voltage transformer (6) is connected to the transformer calibrator ( 5) Bidirectional connection, the automatic control and switching circuit (2) is bidirectionally connected with the transformer calibrator (5). 2. A 220V output voltage multi-output voltage transformer testing system according to claim 1, characterized in that the automatic control and switching circuit (2) is composed of an automatic control circuit and an automatic switching circuit, and the automatic control circuit consists of Single-chip microcomputer U1 and its peripheral components crystal y0, capacitors C1-C2, and stepper motor drive chip U2; The input terminal of the stepping motor driver chip U2 is connected to the PB0-PB5 ports of the single-chip microcomputer U1; the SDA port and the SDL port of the single-chip microcomputer U1 are respectively connected to the corresponding input terminals of the transformer calibrator (5); The automatic switching circuit is composed of transistors VT1-VTn, relays J1-Jn, freewheeling diodes D1-Dn, and resistors R1-Rn; the bases of transistors VT1-VTn are respectively connected to PA0-PAn ports of single-chip microcomputer U1 through resistors R1-Rn , The relays J1-Jn are respectively connected between the collectors of the transistors VT1-VTn and the ground. 3. A multi-output voltage transformer testing system with 220V output voltage according to claim 2, characterized in that one end of the normally open contact J1-1-Jn-1 of the relay J1-Jn is connected to the transformer The other end of pin 1 of the calibrator (5) is respectively connected to one end of the secondary winding L1-Ln of the multi-output voltage transformer (6) to be tested, and the secondary winding of the multi-output voltage transformer (6) to be tested The other ends of L1—Ln are all connected to the 4 pins of the transformer calibrator (5); The terminals M and N of the first load box (3) are connected to both ends of the secondary winding L0 of the multi-output voltage transformer (6) to be tested, and one end of the secondary winding L0 is connected to a transformer calibrator Pin 4 of (5), the other end of which is connected to pin 2 and pin 3 of the transformer calibrator (5); The connection terminal M of the second load box (4) is connected to the common connection terminal of the secondary winding of the measured multi-output voltage transformer (6), and the connection terminal N of the second load box (4) is connected to the normal The common connection ends of the open contacts J1-1—Jn-1 are connected; Pin 1 and pin 2 of the transformer calibrator (5) are error input terminals ΔU; pins 3 and 4 of the transformer calibrator (5) are standard voltage input terminals Up. 4. the multi-output voltage transformer test system of a kind of 220V output voltage according to claim 3, it is characterized in that the model of described single-chip microcomputer U1 is Atmega16, and the model of stepping motor drive chip U2 is L298N. 5. A 220V output voltage multi-output voltage transformer testing system according to claim 4, characterized in that the model of the transformer calibrator (5) is HEF-H, and the secondary step-down The transformation ratio of the transformer Tp is changed to 2.2 times of the original transformation ratio, and the resistance value of the conversion resistor R _U is changed to 2.2 times of the original resistance value. 6. A 220V output voltage multi-output voltage transformer testing system according to claim 5, characterized in that the models of the first load box (3) and the second load box (4) are Fy50, and in The input terminals of the first load box (3) and the second load box (4) are connected with a 220/110V autotransformer B1. 7. A 220V output voltage multi-output voltage transformer testing system according to claim 6, characterized in that the automatic voltage regulating transformer (1) is an automatic voltage regulating transformer controlled by a stepping motor.

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