CN204855647U - A discharge device for transformer winding direct current resistance measurement - Google Patents

Abstract

The utility model discloses a discharge device for transformer winding direct current resistance measurement, including circuit breaker, the discharge indicating circuit and the discharge circuit of establishing ties in proper order, the one end of circuit breaker with linked to each other by exoelectric single phase transformer winding X end, the one end that the other end of circuit breaker discharges indicating circuit links to each other, the indicating circuit's that discharges the other end links to each other with the discharge circuit, the other end of discharge circuit with linked to each other by exoelectric single phase transformer winding A end. The utility model discloses discharge to the winding after can realizing measuring single phase transformer winding direct current resistance to through the observation instruction of discharging, master the discharge process, whole the discharge process safe and reliable has reduced testing personnel's safe risk, has reached to the exoelectric purpose of winding behind the measurement single phase transformer winding direct current resistance.

Description

A Discharging Device for Measuring DC Resistance of Transformer Winding

technical field

The utility model relates to a discharge device for measuring the DC resistance of a transformer winding, which is suitable for rapid discharge of the measured winding after the DC resistance measurement of the transformer winding.

Background technique

In the preventive test of power transformer equipment, the measurement of DC resistance of transformer winding is one of the test items stipulated in DL/T596 "Preventive Test Regulations for Electric Power Equipment". The purpose of measuring the DC resistance of transformer winding is to check the welding quality of winding joints And whether there are faults such as inter-turn short circuit, since the equivalent circuit of the transformer winding is a series circuit of inductance and resistance, in the process of measuring the DC resistance of the winding, the inductance is also charged, and the energy stored in the winding during the charging process is 1/2 *L*I ² , the greater the winding inductance L and the test DC current I, the greater the stored energy. Therefore, after measuring the DC resistance of the winding, the winding needs to be discharged. At present, most transformers with voltage levels of 500KV and above use three A single-phase transformer is composed of a three-phase transformer structure through external wiring. For the wiring for measuring the DC resistance of the single-phase transformer winding, according to the requirements of the regulations, the positive pole of the DC measurement power supply is connected to the A terminal of the winding, and the ground of the DC measurement power supply is connected to the X terminal of the winding. For the discharge equipment after measuring the DC resistance of single-phase transformer windings, discharge rods are mainly used to discharge and other methods. The discharge operation process cannot be observed and the operation is not standardized, which brings safety hazards to the personal safety of the measurement personnel.

Contents of the invention

The purpose of the utility model is to provide a discharge device for measuring the DC resistance of transformer windings.

The purpose of this utility model is achieved through the following technical solutions: a discharge device for transformer winding DC resistance measurement, including a circuit breaker, a discharge indicating circuit and a discharge circuit connected in series, one end of the circuit breaker and the discharged single-phase transformer winding The X end is connected, the other end of the circuit breaker is connected to one end of the discharge indication circuit, the other end of the discharge indication circuit is connected to the discharge circuit, and the other end of the discharge circuit is connected to the discharged single-phase transformer winding A end.

The beneficial effects of the utility model are: a discharge device used for measuring the DC resistance of transformer windings is connected to the discharged single-phase transformer windings, and the measurement test personnel can realize the measurement of the DC resistance of the single-phase transformer windings by operating the circuit breaker to open and close. Discharge the winding after the resistance, and grasp the discharge process by observing the discharge indication. The whole discharge process is safe and reliable, which reduces the safety risk of the test personnel, and achieves the purpose of discharging the winding after measuring the DC resistance of the single-phase transformer winding.

Description of drawings : Fig. 1 is a circuit block diagram of the present utility model

Below in conjunction with accompanying drawing 1 the content of the present utility model is described in further detail.

Accompanying drawing 1: be the circuit block diagram of the present utility model. It consists of a circuit breaker (1); a discharge indicating circuit (2); and a discharge circuit (3).

Specific implementation methods :

Below in conjunction with accompanying drawing and reference numeral, the utility model is described further.

As shown in Figure 1, a discharge device for measuring the DC resistance of transformer windings, including a circuit breaker (1), a discharge indicator circuit (2) and a discharge circuit (3) connected in series in sequence, one end of the circuit breaker (1) It is connected to the X terminal of the discharged single-phase transformer winding, the other end of the circuit breaker (1) is connected to one end of the discharge indication circuit (2), and the other end of the discharge indication circuit (2) is connected to the discharge circuit (3), and the discharge circuit The other end of (3) is connected to end A of the discharged single-phase transformer winding, wherein: the discharge indication circuit (2) is an indicator light, and the discharge circuit (3) is a resistor.

After measuring the DC resistance of the single-phase transformer winding, when the winding is discharged, the measurement tester closes the circuit breaker, connects a discharge device used for measuring the DC resistance of the transformer winding in series with the transformer winding, and performs discharge. The measurement tester You can also observe the discharge process and effect.

Claims (1)

1. the electric discharge device for Transformer Winding direct current resistance m easurem ent, comprise the isolating switch (1) of connecting successively, electric discharge indicating circuit (2) and discharge circuit (3), one end of isolating switch (1) is held with the single transformer winding X be discharged and is connected, the other end of isolating switch (1) is connected with one end of electric discharge indicating circuit (2), the other end of electric discharge indicating circuit (2) is connected with discharge circuit (3), the other end of discharge circuit (3) is held with the single transformer winding A be discharged and is connected, wherein: electric discharge indicating circuit (2) is pilot lamp, discharge circuit (3) is resistor.