CN107643502A - A kind of high-voltage electrical apparatus detecting instrument check device - Google Patents

Abstract

The invention discloses an inspection device for high-voltage electrical testing instruments, which relates to the technical field of electric power measurement, and aims at the lack of special functional verification means for various electrical testing instruments used by the current electric power sector, and it is impossible to confirm that the equipment is used before and after use. In order to solve the problem of the integrity of the end, the high-voltage circuit board, connecting wires, insulating cylinders, and measuring instruments are installed in the box, and the wiring terminals and panels are set on the box. The high-voltage circuit board is equipped with high-voltage capacitors, high-voltage resistors, precision resistors, and transformers. , a technical scheme in which high-voltage capacitors, high-voltage resistors, precision resistors, and transformers are integrated on the high-voltage circuit board in series or in parallel. The invention is applicable to capacitor dielectric loss testers, insulation resistance testers, loop resistance testers, Functional inspection of various types of commonly used electrical testing instruments such as DC resistance tester, impedance tester, and transformation ratio tester, with various functions and strong practicability.

Description

A high-voltage electrical detection instrument inspection device

technical field

The invention relates to the technical field of electric power measurement, in particular to a high-voltage electric detection instrument inspection device.

Background technique

High-voltage electrical testing instruments are the basic tools for power equipment diagnosis in the power sector. There are many types of instruments, involving the detection of different types of electrical equipment such as capacitors, resistors, and inductances. At present, the power sector generally lacks specialized functional verification methods for the various electrical testing instruments used, and cannot confirm that the instruments and equipment are in good condition before and after use. Due to handling collisions, frequent use, improper use methods and other reasons, there are many problems with the lack of functionality of electrical testing instruments. Due to the lack of special functional verification methods, they are not found in time, which affects the efficiency of testing work to varying degrees. Sending high-voltage electrical testing instruments for inspection and calibration can only solve the calibration problem of the instruments in long-term use, but in the process of short-term frequent use, only a few instruments have standard self-calibration modules, which are scattered and inconvenient.

Contents of the invention

The invention provides an inspection device for high-voltage electrical testing instruments, which is used to solve the problem that the current electric power sector generally lacks means for specialized functional verification of various electrical testing instruments used, and cannot confirm the integrity of the instruments and equipment before and after use and Sending high-voltage electrical testing instruments for inspection and calibration can only solve the calibration problem of the long-term use of the instrument, but in the process of short-term frequent use, only a few instruments have standard self-calibration modules, which are scattered and inconvenient.

In order to solve the above problems, the present invention adopts the following technical solutions to realize:

A high-voltage electrical detection instrument inspection device, including a box body, a high-voltage circuit board, a terminal block, a panel, a connecting wire, an insulating cylinder, and a measuring instrument;

A high-voltage circuit board is arranged in the box body, a panel is arranged on the box body, and wiring terminals and measuring instruments are arranged on the panel;

The high-voltage circuit board is provided with high-voltage capacitors, high-voltage resistors, precision resistors, and transformers, and the high-voltage capacitors, high-voltage resistors, precision resistors, and transformers are integrated on the high-voltage circuit board in series or parallel;

The high-voltage circuit board is connected to the terminal on the panel through the connecting wire;

The device is divided into a high-voltage test area, a high-current test area, and an impedance ratio test area.

Preferably, the box is a high-strength steel shell box with electromagnetic shielding function.

Preferably, the high-voltage circuit board is a glass fiber board.

Preferably, the high voltage test area includes a high voltage test loop one and a high voltage test loop two;

High-voltage test circuit 1 is composed of 1 high-voltage capacitor and 2 high-voltage resistors. One end of the high-voltage capacitor is connected to terminal 1, the other end of the high-voltage capacitor is connected to terminal 2, one end of high-voltage resistor R1 and one end of high-voltage resistor R2, and the other end of high-voltage resistor R1 It is connected to terminal 4, and the other end of high voltage resistor R2 is connected to terminal 5;

The high-voltage test circuit 2 is composed of three high-voltage resistors in series, and a voltmeter is connected in parallel at both ends of the high-voltage test circuit 2, and a connection terminal is drawn out from both ends of each resistor.

Preferably, the high-current test area includes a high-current test loop one and a high-current test loop two;

High-current test circuit 1 is composed of 3 micro-ohm level precision resistors in series, which is used for functional inspection of micro-ohm level high-current test instruments; high-current test circuit 2 is composed of 3 milliohm-level precision resistors in series, used for Functional inspection of European measuring-grade high-current test instruments.

Preferably, the impedance transformation ratio test area is composed of a single-phase double-winding transformer with a center tap, and is used for functional inspection of impedance test and transformation ratio test instruments.

Preferably, the lead-out terminals of the high-voltage test area adopt pure magnetic insulators with a rated voltage level of 10kV;

The lead wires from the circuit interface of the high-voltage capacitor and the high-voltage resistor to the panel interface are all set in the insulating cylinder.

Preferably, the high-voltage capacitor is a high-voltage polypropylene film capacitor with a rated voltage of 10kV;

The high-voltage resistor is a high-power glass-glazed non-inductive high-voltage resistor with a rated voltage of 10kV.

Preferably, the precision resistor is a four-lead manganese-copper sampling resistor, and the maximum allowable through-current is 200A.

Preferably, the rated transformation ratio of the double-winding transformer is 220V:220V, and the middle tap is drawn from the secondary side of the transformer.

The present invention has following characteristics:

1. It is suitable for functional inspection of many different types of common electrical testing instruments, including capacitance dielectric loss tester, insulation resistance tester, loop resistance tester, DC resistance tester, impedance tester, and transformation ratio tester. Diverse and practical;

2. The panel interface is simple, the method of use is fast and flexible, and different interfaces can be selected according to the different ranges of the instrument to be tested;

3. Insulation design with sufficient margin, good insulation performance, and certain shockproof and anti-interference capabilities, the device is safe and reliable;

4. Electric power operation and maintenance test personnel can use the present invention to efficiently check instrument functionality before and after carrying out test work, so as to ensure the effectiveness of test work and the integrity of instrument detection functions, and it is worthy of widespread promotion in the electric power sector.

Description of drawings

Accompanying drawing 1 is a schematic diagram of circuit wiring of the high-voltage circuit board in the box;

Accompanying drawing 2 is a schematic diagram of the cabinet panel;

Accompanying drawing 3 is the box front section view.

detailed description

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. The detailed description of embodiments of the invention generally described and illustrated in the drawings herein is not intended to limit the scope of the invention as claimed, but represents only selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

A high-voltage electrical detection instrument inspection device is a function inspection device designed based on different types of high-voltage electrical detectors and their detection objects (capacitors, resistors, and inductances), and is used to check the effectiveness of the instrument's test functions.

The device is composed of a high-strength steel shell and a box with electromagnetic shielding function, a high-voltage circuit board made of glass fiber material, external terminals and panels, connecting wires, insulating cylinders, and measuring meters; the high-voltage circuit board integrates high-voltage capacitors , High-voltage resistors, precision resistors, transformers and other components are integrated on the high-voltage circuit board in a series (parallel) manner; the high-voltage circuit board is set inside the box, and the corresponding component interfaces of the high-voltage circuit board are connected to the The terminals on the panel of the cabinet are connected; the panel of the device can be divided into high-voltage test area, high-current test area, and impedance ratio test area according to the function.

The circuit design of the high-voltage circuit board in the box is divided into three circuit module areas according to the functions of different testing instruments (pressurization type, flow-through type, and coil test type). The schematic diagram of the circuit design is shown in Figure 1, and the corresponding interface panel is shown in Figure 2. As shown, the front section view of some components in the box is shown in Figure 3.

First, the components and circuits in the high-voltage test area are integrated on the high-voltage circuit board, which consists of two different test circuits:

Circuit 1 is composed of a high-voltage capacitor and two high-voltage resistors connected in series. The specific wiring and lead-out terminals are shown in Figure 1. The first end of capacitor C1 is connected to port 1, and the end of C1 is connected to port 2. At the same time, the resistors R1 and R2 are connected in parallel. The first terminal 3, the ends of resistors R1 and R2 are connected to ports 4 and 5 respectively; this circuit can be used for functional inspection of capacitance dielectric loss test instruments (such as dielectric loss tester, capacitance tester, high-voltage bridge, etc.). In this case, the capacitance of C1 is set to 1600pF, and R1 and R2 are respectively 50kΩ and 100kΩ.

Loop 2 is composed of 3 high-voltage resistors in series. The specific wiring and lead-out terminals are shown in Figure 1. The first end of resistor R3 is connected to port 6, and the end of R3 is connected to port 7. At the same time, it is connected to the first end of R4, and the end of R4 is connected to port 8. At the same time, connect the first end of R5 in parallel, and connect the end of R5 to port 9. A high-voltage voltmeter V can be connected in parallel between port 6 and port 9 to measure and display the voltage applied to the circuit, and to verify that the pressurization function of the instrument to be tested is normal. This circuit can be used for functional inspection of insulation resistance test instruments (such as digital megger, insulation shaker, etc.). In this case, the resistance values of R3, R4, and R5 are set to 10GΩ, 10MΩ, and 10kΩ, respectively.

Among them, the high-voltage capacitor C1 is a high-voltage polypropylene film capacitor with a rated voltage of 10kV; the high-voltage resistors R1, R2, R3, R4, and R5 are high-power glass-glazed non-inductive high-voltage resistors with a rated voltage of 10kV.

In the high-voltage test area, pure magnetic insulators are used for the lead-out terminals 1 and 2 of the device, and the rated voltage level is 10kV; the lead-out wires from the high-voltage capacitor and high-voltage resistance circuit interface to the device panel interface are all set in the insulating tube (tube). Figure 3 shows.

Second, the components and circuits in the high-current test area are integrated on the high-voltage circuit board, which consists of two different test circuits:

Among them, loop 1 is composed of 3 micro-ohm level precision resistors in series, which is used for functional inspection of micro-ohm measurement level high-current test instruments (such as loop resistance tester, double-arm bridge, etc.); the specific wiring and lead-out terminals are shown in Figure 1 As shown, the first end of resistor r6 is connected to port 10, the end of r6 is connected to port 11, and the end of r7 is connected to port 12, and the end of r8 is connected to port 13. In this case, the resistance values of r6, r7, and r8 are all set to 300μΩ.

Loop 1 is composed of 3 milliohm-level precision resistors in series, which is used for functional inspection of milliohm-level high-current test instruments (such as DC resistance testers, grounding resistance meters, etc.); the specific wiring and lead-out terminals are shown in Figure 1 , the first end of r9 is connected to port 14, the end of r9 is connected to port 15, and at the same time connected to the first end of r10, the end of r10 is connected to port 16, and connected to the first end of r11 at the same time, the ends of r8 and r11 are connected to port 13 in parallel, and then connected in series The rear of the ammeter I is connected to port 17 and connected to port 23 at the same time. In this case, the resistance values of r9, r10, and r11 are all set to 300mΩ.

Among them, the precision resistors r6, r7, r8, r9, r10, and r11 are four-lead manganese-copper sampling resistors, and the maximum allowable flow is 200A.

Third, the components and circuits of the impedance ratio test area are integrated on the high-voltage circuit board, which consists of a single-phase double-winding transformer TR with a center tap, which is used for functional inspection of impedance test and ratio test instruments; The specific wiring and lead-out terminals are shown in Figure 1. The first terminal of the primary side of the transformer is connected to port 21, and the end of the primary side is connected to port 22. At the same time, it is connected to the grounding port 23. The first terminal of the secondary side of the transformer is connected to port 20, and the end of the secondary side is connected to port 18. The middle tap is connected to port 19. The rated transformation ratio of the double-winding transformer is 220V:220V, and the center tap is drawn from the secondary side of the transformer.

Instrument functional inspection case:

Case 1: Functional inspection of capacitor dielectric loss instruments

When performing a functional inspection of a dielectric loss tester or a capacitance tester, it is only necessary to regard terminal 1 as the head of a single capacitive device, and terminal 2 or terminal 4 or terminal 5 as the end of the capacitive device. Form different collocations of 1-2, 1-4, 1-5, all of which can be measured to obtain the capacitance value, and confirm that the value is within a certain deviation range from the nominal capacitance of C1 (the deviation size can be determined by referring to the accuracy of the instrument) Capacitance measurement function is intact; In addition, different terminals 1-2, 1-4, 1-5 are connected, and the measured three sets of dielectric loss values are consistent with the nominal values designed by the present invention (dielectric loss 1, dielectric loss 2, dielectric loss Loss 3) for comparison, by comparing the deviation of the dielectric loss measurement (the deviation can be determined by referring to the accuracy of the instrument) to confirm that the dielectric loss measurement function is intact.

Case 2: Functional inspection of insulation resistance test equipment

When performing a functional inspection of a digital megohmmeter or an insulation shaker, it is only necessary to regard terminal 9 as the end of an insulator, and terminal 6 or terminal 7 or terminal 8 as the head of the insulator to form 6-9 , 7-9, 8-9 different collocations, you can measure three sets of different insulation resistance values, by comparing with the nominal value (10GΩ, 10MΩ, 10kΩ) designed by the present invention, by comparing the insulation resistance value measurement The deviation amount (the deviation size can be determined by referring to the accuracy of the instrument) to confirm that the insulation resistance measurement function is intact.

Case 3: Functional inspection of micro-ohm measurement level high current test instrument

When performing a functional inspection of the loop resistance tester, it is only necessary to regard terminal 17 as the end of the resistance to be tested, and terminal 10 or terminal 11 or terminal 12 as the first end of the resistance to be tested to form 10-17, 11-17 , 12-17 different collocations, three groups of different loop resistance values can be measured, and compared with the nominal values (900μΩ, 600μΩ, 300μΩ) designed by the present invention, the deviation measured by comparing the resistance value (deviation The size can be determined by referring to the accuracy of the instrument) to confirm that the loop resistance is functionally intact.

Case 4: Functional inspection of milliohm measurement-level high-current test instruments

When performing a functional inspection of the DC resistance tester, it is only necessary to use terminal 17 as the end of the resistance to be tested, and terminal 14 or terminal 15 or terminal 16 as the first end of the resistance to be tested to form 14-17, 15-17 , 16-17 different collocations, three different sets of DC resistance values can be measured, and compared with the nominal values (900mΩ, 600mΩ, 300mΩ) designed by the present invention, the deviation measured by comparing the resistance value (deviation The size can be determined by referring to the accuracy of the instrument) to confirm that its DC resistance is functionally intact.

Case 5: Functional inspection of ratio tester

When performing a functional inspection of the ratio tester, you only need to use terminals 21-22 as the primary side of the transformer to be tested, and terminals 20-18 or 19-18 as the secondary side of the transformer to be tested, and you can measure Two sets of different transformation ratio values are compared with the nominal values (rated transformation ratio, center tap transformation ratio) designed by the present invention, and confirmed by comparing the deviation of the transformation ratio measurement (the deviation can be determined by referring to the accuracy of the instrument) Its ratio measurement functionality is intact.

Case 6: Functional inspection of impedance tester

When carrying out the functional inspection of the impedance tester and inductance tester, it is only necessary to open the terminal 18, terminal 19, and terminal 20, and measure the terminals 21-22 as a set of reactance, and the obtained impedance value (inductance value) Compared with the nominal value designed by the present invention, it is confirmed that the impedance measurement function is intact by comparing the deviation of the impedance measurement (the deviation can be determined by referring to the accuracy of the instrument).

Claims (10)

1. A kind of 1. high-voltage electrical apparatus detecting instrument check device, it is characterised in that：

   Including casing, high-tension circuit plate, binding post, panel, connecting line, insulating cylinder, measuring instrumentss；

   High-tension circuit plate is provided with the casing, panel is provided with above casing, binding post and measurement are provided with panel Instrument；

   The high-tension circuit plate is provided with high-voltage capacitance, high-tension resistive, precision resistance, transformer, the high-voltage capacitance, high-tension electricity Resistance, precision resistance, transformer are integrated in by way of serial or parallel connection on the high-tension circuit plate；

   High-tension circuit plate is connected by connecting line with the binding post on panel；

   Described device is divided into Hi-pot test area, high-current test area, impedance no-load voltage ratio test section.
2. 2. device according to claim 1, it is characterised in that：

   The casing is the high strength steel housing box body with electro-magnetic screen function.
3. 3. device according to claim 1, it is characterised in that：

   The high-tension circuit plate is glass mat.
4. 4. device according to claim 1, it is characterised in that：

   The Hi-pot test area includes Hi-pot test loop one and Hi-pot test loop two；

   Hi-pot test loop one is made up of 1 high-voltage capacitance and 2 high-tension resistives, and high-voltage capacitance one end is connected with binding post 1, The high-voltage capacitance other end is connected with binding post 2, high-tension resistive R1 one end and high-tension resistive R2 one end, and high-tension resistive R1 is another End is connected with binding post 4, and the high-tension resistive R2 other ends are connected with binding post 5；

   Hi-pot test loop two is composed in series by 3 high-tension resistives, and the both ends of Hi-pot test loop two are parallel with voltmeter, each Draw a binding post in individual resistance both ends.
5. 5. device according to claim 1, it is characterised in that：

   The high-current test area includes high-current test loop one and high-current test loop two；

   High-current test loop one is composed in series by 3 micro-ohm level precision resistances, and level cranking test instrument is measured for micro-ohm Feature inspection；High-current test loop two is composed in series by 3 milliohm level precision resistances, and level high current is measured for milliohm The feature inspection of test apparatus.
6. 6. device according to claim 1, it is characterised in that：

   The impedance no-load voltage ratio test section is formed by 1 with tapped single-phase two-winding transformer, for testing impedance class, No-load voltage ratio tests the feature inspection of quasi-instrument.
7. 7. device according to claim 1, it is characterised in that：

   The leading-out terminal in the Hi-pot test area uses pure magnetic insulator, grade of rated voltage 10kV；

   The high-voltage capacitance, the lead-out wire of circuit interface to panel interface of high-tension resistive are enclosed in insulating cylinder.
8. 8. device according to claim 4, it is characterised in that：

   The high-voltage capacitance is high-pressure polypropylene thin film capacitor, rated voltage 10kV；

   The high-tension resistive is the noninductive high-voltage resistor of high-power glass glaze, rated voltage 10kV.
9. 9. device according to claim 5, it is characterised in that：

   The precision resistance is four lead copper-manganese sampling resistors, it is maximum allowable it is through-flow be 200A.
10. 10. device according to claim 6, it is characterised in that：

    The two-winding transformer nominal transformation ratio is 220V:220V, centre tap are drawn by transformer secondary.