UA30560U - Installation for testing high-voltage shunting reactors - Google Patents

Abstract

Installation for testing high-voltage shunting reactors to which additionally are included direct voltage source, high voltage switch, this is rated for rated voltage of reactor, as capacitor one uses common capacitor to which splinting capacitor relates, own capacitor of reactor and its high-voltage input and other apparatuses, at that the first output of direct voltage source is connected to first output of high-voltage switch, second output of high voltage switch is connected to first output of reactor with existing parallel common splint capacitor, second output of direct voltage source is connected to second output of reactor.

Description

Description of the invention

A useful model relates to the field of electrical engineering and can be used to monitor the insulation condition of 2 high voltage shunt reactors.

As an analogue, the megohmmeter device used for insulation tests of high-voltage shunt reactors was chosen (GKD 34.20.302-2002. Standards for testing electrical equipment. - Kyiv, 2002. - p. 1521, which consists of a constant voltage generator 25008 and a logometric insulation resistance measuring device 70 The disadvantage of this device is that it does not allow determining the state of the winding insulation, and also that the measurements are carried out at a constant voltage, which is much lower than the operating voltage of these reactors.

Also, an analogue can be a device for measuring dielectric loss of insulation (GKD 34.20.302-2002.

Norms of electrical equipment testing. - Kyiv, 2002. - p.156), which consists of a power source with alternating voltage up to 10 kV and a bridge measuring device. 12 The disadvantages of this device are that the test voltage does not exceed 10kV, which is significantly less than the operating voltage of the reactors and, just as in the previous device, it does not determine the state of the winding insulation.

A device for controlling the winding insulation of windings of electrical machines and devices is also known

IDeclaration patent of Ukraine Mo33736 A, M-Kl." SZO12. 31/14, Bull. Mo1, 2001. Method of controlling the thread insulation of windings of electrical machines and devices and a device for its implementation). This device contains an adjustable voltage source, a storage capacitor, a power a key, terminals for connecting the object of control, a voltage divider, a digital calculator, a memory block, a monitor, and a digital-to-analog converter

ADC, the input of the ADC is connected to the output of the voltage divider, and its output is connected to the first input of the digital computer, the second input of which is connected to the memory unit, the first input of the digital computer is connected to the monitor, the second input - with the input of the digital-to-analog converter, the output of which is connected 729 to the control input of the power key. The advantage of this device is the ability to detect winding circuits, and the disadvantages are the low test voltage and the impossibility of determining the state of the main insulation.

The prototype was chosen to be an installation for monitoring the isolation of high-voltage shunt reactors (Testing of high-power transformers and reactors / G.V. Alekseenko, A.K. Ashryatov, E.A. Veremey, E.S. Frid - M.: Znergia, 1978. - 520 p. p. 376-383), which contains a power source in the form of a synchronous generator, an intermediate o

A test transformer of the MOM-500/500 type and a battery of capacitors. The output of the synchronous generator is connected through a switch to the primary winding of the test transformer, the secondary winding of which is connected to the capacitor bank and the reactor under test. i am

The disadvantage of this installation is that it is not suitable for testing in the conditions of operating electrical installations, "3 where there is no possibility of installing a generator, an intermediate transformer and a capacitor bank.

The purpose of the proposed technical solution is to create an installation for monitoring the insulation of operating high-voltage shunt reactors, in which an increase in the test voltage to the value of the full design voltage is achieved for both the main and winding insulation. As a result, there is an opportunity to assign maintenance and repair measures more reasonably and objectively. In addition, there is an opportunity to control not only the resistance and dielectric losses in the insulation, but also the parameters of partial discharges at a voltage higher than the operating voltage, which will make it possible to prevent reactor failure. The task is achieved by introducing new elements and the connections between them into the installation for "testing high-voltage shunt reactors, which contains a direct current power source, a switch and the reactor under test, while the first output of the power source through the switch with" connected to one terminal of the reactor, and the second terminal of the power source is connected to the second terminal of the reactor. The proposed 395 installation differs in that the power source is made as a direct current source of the DPS (instead of a synchronous generator, as in the prototype), the switch B is rated for reactor voltage (and not on the o voltage of the synchronous generator, as in the prototype) - as a rule, the high-voltage switch of the reactor is used, as a capacity, the general capacity is used, which includes the capacity of the busbar, its own capacity and the capacity of the reactor and its high-voltage input and other devices (a not a capacitor battery with a test

Ge") 50 transformer, as in the prototype).

The essence of the proposed technical solution is explained by the drawing, where Fig. 1 shows the structural diagram of the installation for testing high-voltage shunt reactors.

Figure 1 shows that the installation includes a source of direct current 1, a high voltage switch 2 (corresponding to the operating voltage of the reactor under test) and the reactor 4 under test. The potential 59 terminal 5 of the current source 1 is connected to the first terminal 7 of the switch 2, the second terminal 8 of the switch 2 is connected to the first (potential) terminal 9 of the reactor 4, and the second (zero) terminal E of the current source 1 is connected to the second (zero) terminal 10 reactor 4. At the same time, the total capacity of the busbar, together with the own capacity of the reactor and its high-voltage input and other devices (which is designated as capacity 3) acts as a capacitor, as if connected in parallel to the shunt reactor 4 under test. because the proposed installation works as follows: after supplying current from the direct current source 1 through the closed contact of the switch 2 and through the winding of the reactor 4, magnetic energy is accumulated in the reactor 4.

At the end of the magnetic energy accumulation process (several minutes), switch 2 is turned off. The energy from reactor 1 goes to tank 3. Tank C is charged and then discharged to the inductance of the reactor, 65 in the electric circuit of tank C and reactor 4 self-oscillations occur, which die out.

As an example, consider the possibility of using the proposed installation for testing the isolation of the RODC 110000/750 reactor (marked on the diagram with the number 4).

We accept:

I -6Hn - reactor inductance RODC 110000/750;

C-6800pFf - the capacity (indicated on the diagram with the number 3) of the busbar, which is connected to the inputs of the reactor; 1 - an adjustable source of direct current, which provides a current of up to 50A (no-load voltage no more than 10008); 2 - 750KV switch. 70 When the current flows through reactor 4, it stores energy o -(a2gug p)

After the switch 2 is turned off, this energy is transferred to the capacity C, as a result of which /5 Oscillations with an angular velocity c occur in the circuit Y-C.

Energy stored in capacity C connected to this input

Os-C2s2 (2)

According to the law of conservation of energy about -Os. (3)

In the circuit "inductance I. of the reactor - capacity C" there will be oscillations, which are determined by the equation

Phi -1/9s. (4) 7

From where 1 o

Sh - write

Is (Te)

Then, equating C) and Os, we obtain o

FI Os-xI21/2)-(02s/2)- 121 502. (6)

From "O

The factory test voltage of the reactor insulation according to GOST 1516-78 is 700 kV. In the conditions of operation of the insulation, the test voltage of the insulation is 8095 from the factory voltage (0 du Tsapko 787 442743 - BZbka - ts 635 kV at the reactor inlets will occur in the event of a current interruption i? s st5О0-10-12 9

And - B350001--YES ---- same 2ZHAH

I B o o To obtain a voltage n times greater, it is necessary to interrupt a current n times greater.

The use of the proposed technical solution allows for insulation control during and 50 tests of high-voltage shunt reactors. In the installation, compared to the prototype, it is achieved

Ge") simplification of the design and at the same time an increase in the test voltage to the value of the full design voltage is ensured both for the main and for the winding insulation. This makes it possible to more objectively assess the technical condition of the reactor insulation at the current moment in time and to predict its change in condition in the future, which makes it possible to reasonably and objectively prescribe maintenance and repair measures. In addition, the proposed installation makes it possible to control not only the resistance and dielectric losses in the insulation, but also the parameters of partial discharges at a voltage that exceeds the operating voltage, which will make it possible to prevent reactor failure.

Claims (1)

The formula of the invention High voltage shunt reactor test setup, which includes a circuit breaker and the reactor under test, which is distinguished by the fact that a direct current source is introduced, the high voltage circuit breaker, which is designed for the rated voltage of the reactor, the total capacity is used as the capacity, which includes the busbar capacity, own capacity of the reactor and its high-voltage input and other devices, and the first output of the direct current source is connected to the first output of the high-voltage circuit breaker, the second output of the high-voltage circuit breaker is connected to the first output of the reactor with the parallel existing busbar capacity, the second output of the direct current source is connected to of the second output of the reactor. » z o «s yu o so - with . z» d) o o F Pe s bo 65