CN104977555B - A kind of test system and its test method for being directly injected into controllable pulse source PD meter - Google Patents

Abstract

A test system and test method for directly injecting a controllable pulse source partial discharge instrument, comprising a controllable pulse source (1), a shielded antenna (2), and a partial discharge instrument to be tested (3) sequentially connected end to end through wires (5) , digital oscilloscope (4), protective grounding (6), zero grounding (7); the controllable pulse source is used to generate various required types of pulses; the shielded antenna is used to shield the magnetic field generated by the current so as not to affect the The normal operation of other components; the partial discharge instrument under test is used to detect partial discharge signals; the digital oscilloscope is used to collect standard pulse signals; the wires are used to connect various components of the test system; The charge is released through the ground to protect the components; the zero ground is used to ground the zero in the local instrument test circuit system. The invention has the advantages of stable output pulse, adjustable pulse parameters, strong anti-interference, simple and reliable realization principle, and the like.

Description

A test system and test method for direct injection into controllable pulse source partial discharge instrument

technical field

The invention relates to the technical field of partial discharge diagnosis of power equipment, in particular to a test system and a test method for direct injection into a controllable pulse source partial discharge instrument.

Background technique

Partial discharge of power equipment is the main cause of insulation degradation, and it is also the main symptom and manifestation of insulation degradation. Therefore, the detection of partial discharge can more sensitively reflect the early failure of the equipment, and provide a basis for effective preventive measures, which is of great significance to the safe and stable operation of electric high-voltage equipment.

The partial discharge signal level is an indispensable means to measure the insulation status of electrical equipment. However, for different equipment under test, the same discharge amount will show great differences in the measurement results shown in the partial discharge instrument, even for the same equipment under test. Equipment, different test loops will also bring different measurement results. Therefore, calibrating the PD meter with a PD calibrator is crucial for accurate measurement of PD levels.

At present, there are many partial discharge instruments at home and abroad, but their performance and reliability often cannot meet the requirements of partial discharge testing. At present, there are many methods for detecting partial discharge instruments, such as pulse current method, ultrasonic wave, ultra-high frequency method, etc., but each method does not have a complete means and system for instrument testing.

Contents of the invention

The object of the present invention is to provide a test system and a test method for directly injecting a controllable pulse source partial discharge instrument, which are used for testing the performance of the existing partial discharge detection device.

In order to achieve the above object, the technical scheme proposed by the present invention is as follows:

A test system directly injected into a controllable pulse source partial discharge instrument includes a controllable pulse source connected end to end through wires, a shielded antenna, a partial discharge instrument to be tested, a digital oscilloscope, a protective ground, and a zero ground. The controllable pulse source is used to generate various required types of pulses, including single pulses with adjustable parameters such as amplitude, polarity, rising edge time, falling edge time, and pulse width; the shielded antenna is used to convert the magnetic field generated by the current Shielding so as not to affect the normal operation of other components; the partial discharge instrument under test is used to detect partial discharge; digital oscilloscope is used to collect standard pulse signals; wires are used to connect various components of the test system; The generated harmful charges are released through the ground to protect the components; the zero ground is used to ground the zero in the local instrument test circuit system.

The method for testing using the testing system of the present invention comprises the following steps:

Step 1: Connect the controllable pulse source, shielded antenna, partial discharge instrument to be tested, digital oscilloscope, protective ground, and zero ground through wires end to end in sequence;

Step 2: Turn on the controllable pulse source, use the pulse source to output positive pulses with charges of 1PC, 10PC, 20PC, 50PC, 70PC, and 100PC, and at the same time use the oscilloscope to collect the incoming pulses, use the measurement and control analysis computer to collect the output pulses, and the amplitude of the output pulses The ratio of the charge to the input pulse is the linearity of the partial discharge detection device to be tested to the positive pulse;

Step 3: Turn on the controllable pulse source, use the pulse source to output negative pulses with charges of 1PC, 10PC, 20PC, 50PC, 70PC, and 100PC, and use an oscilloscope to collect the output pulse at the same time. The ratio of the output pulse amplitude to the input pulse charge is the value to be tested Linearity of partial discharge detection device to negative pulse;

Step 4: Compare and analyze the relationship between the linearity of the partial discharge detection device to be tested when the input is positive and negative pulses, so as to obtain the influence of the pulse polarity on the partial discharge detection device to be tested.

The partial discharge test system provided by the invention has the advantages of stable output pulse, adjustable pulse parameters, strong anti-interference, simple and reliable realization principle, and the like.

Description of drawings

Fig. 1 is a structural diagram of the testing system of the present invention;

Figure 2 is the output waveform of the controllable pulse source;

Figure 3 is a graph of the linearity of the positive pulse of the partial discharge instrument.

Detailed ways

The implementation examples will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following descriptions are only illustrative, not intended to limit the scope of the present invention and its application.

Fig. 1 is a block diagram of the testing system directly injected into the controllable pulse source partial discharge instrument. As shown in Figure 1, the test system for directly injecting a controllable pulse source partial discharge instrument provided by the present invention includes a controllable pulse source 1, a shielded antenna 2, a partial discharge instrument 3 to be tested, a digital oscilloscope 4, a wire 5, and a protective ground 6 , zero grounding 7; controllable pulse source 1, shielded antenna 2, partial discharge instrument to be tested 3, digital oscilloscope 4, protective grounding 6, zero grounding 7, connected end to end through wire 5 in turn; the controllable pulse source is used to generate Various types of pulses are required. The shielded antenna is used to shield the magnetic field generated by the current so as not to affect the normal operation of other components. The partial discharge instrument to be tested is used to detect partial discharge. It is used to release the harmful charge generated by the controllable pulse source through the ground to protect the components; the zero ground is used to ground the zero in the local instrument test circuit system.

Figure 2 is a pulse waveform diagram output by a controllable pulse source, (a) is a positive pulse waveform with an amplitude of 1V and a rise time of 4ns, (b) is a positive pulse waveform with an amplitude of 0.5V and a rise time of 4ns, (c) is a negative pulse waveform with an amplitude of 1V and a rise time of 4ns.

Connect the test system of the partial discharge instrument as shown in Figure 1, then use the pulse source to output positive pulses with charges of 1PC, 10PC, 20PC, 50PC, 70PC, and 100PC, and record the output voltage amplitude from the oscilloscope. The abscissa, the output is the ordinate, and the linearity of the partial discharge instrument is obtained. Figure 3 is a graph of the linearity of the positive pulse of the partial discharge instrument.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present invention. , should be covered within the protection scope of the present invention.

Claims (1)

1. a kind of test system for being directly injected into controllable pulse source PD meter, it is characterised in that the test system includes controllable arteries and veins Rushing source (1) and shielded antenna (2) is connected to by conducting wire (5), shielded antenna (2) connects PD meter (3) to be measured by conducting wire (5), PD meter (3) to be measured is connected by conducting wire (5) with digital oscilloscope (4), and controllable pulse source (1) is direct with protective grounding (6) It is connected, PD meter to be measured is connected directly with zero-bit ground connection (7)；The controllable pulse source is used for producing the various arteries and veins for needing type Punching；Shielded antenna is used for the magnetic field shielding for producing electric current in order to avoid influencing the normal work of other components；PD meter to be measured For detecting local discharge signal；Digital oscilloscope is used to gather calibration pulse signal；Conducting wire is used for each of connecting test system Component；Protective grounding is used for the deleterious charge that controllable pulse source produces by the earth release so as to be protected to component； Zero-bit ground connection is used to the zero-bit in local instrument test circuit system being grounded；The method that the test system uses includes：

Step 1：By the controllable pulse source (1), shielded antenna (2), PD meter to be measured (3), digital oscilloscope (4), protection Ground connection (6), zero-bit ground connection (7) are joined end to end successively by conducting wire (5)；

Step 2：Controllable pulse source is opened, is 1PC, 10PC, 20PC, 50PC, 70PC, 100PC using clock output charge Positive pulse, while using oscillograph collection input pulse, export pulse using observing and controlling analysis computer acquisition, export the width of pulse Value and the ratio of input pulse electric charge are the linearity of the local discharge detection device to be measured to positive pulse；

Step 3：Controllable pulse source is opened, is 1PC, 10PC, 20PC, 50PC, 70PC, 100PC using clock output charge Negative pulse, while using oscillograph collection output pulse, output pulse amplitude and input pulse charge ratios are part to be measured The linearity of the discharging detection device to negative pulse；

Step 4：When comparative analysis input is positive and negative pulse, the relation between the linearity of local discharge detection device to be measured, i.e., It can obtain influence of the pulse polarity to local discharge detection device to be measured.