SU758386A1 - Triggering device of antiemergency automatic for users with motor load - Google Patents

Description

The invention relates to the start-up authorities of the automatic input of the backup power supply of consumers with a motor load. five

Known starting bodies containing relay frequency difference, included in the voltage of mutually redundant sections. The input switch is selected using the power direction relay 10 in the circuit of each power input [1].

The closest to the proposed is the start-up body of the Pryvoya-5 automatic automation, which contains a time relay, a two-winding frequency difference relay, the windings of which are connected to voltage sensors of both sections. Input selection can be carried out by any 20 individual sensors, for example, a down-frequency relay or a power direction relay I [2].

] The indicated device functions unreliably at a low voltage level of 25 (on the quenched section, failure ^{of the} power supply sources in the normal mode, voltage transformer malfunction. It does not provide reliable disconnection of the input low

inertial constant running engines.

The purpose of the invention is to increase the reliability of work and the expansion of functionality.

This goal is achieved by the fact that the start-up body of emergency control automatics for consumers with motor load, containing a frequency difference control unit, the inputs of which are connected to voltage sensors of monitored power sources, a storage unit is inserted, and the frequency difference control unit is designed as a reed switch with a resonant frequency This mobile plate is equal to twice the purity of the EMF of the electric motors of the excitation winding of which are included in the Counter and connected to voltage sensors of controlled sources, this reed contact is connected in series with the storage unit.

And between the windings of the excitation of the reed switch and voltage sensors controlled sources introduced switching elements.

The drawing shows a diagram of the proposed device.

758386

’3

⁷ Starting body contains a reed switch 1

with the resonant frequency of the moving contact ^{from the} contact plate '96 Hz. The winding / excitation 2 is connected to the sensor on the ^ - "-""""" jack of the first power source 3,

winding 4 -n voltage sensor of the second power source 5, the windings are connected in opposite. The contact of the reed switch is connected to the input of the storage unit 6, for example, a relay with deceleration drop or a one-shot. Working, "

source frequency is 50 Hz. ^and

The device works as follows. '

In the normal mode, the magnetic fluxes of the windings of the wound are directed oppositely in magnitude and the total magnetic flux is zero. With the disappearance of a single voltage due to short-circuit or transformer malfunctioning.: ... /

. ~ the voltage of the remaining frequency differs from the resonant one (equal to 2 * 50 Hz), the relay does not work, with increasing

- total flow due to phase failure of one voltage transformer,

The frequencies of both sources are different from the resonant, the relay does not work.

When used nesinhronnostirezerviruemyh ^A source of a run mode (e.g., due to the weak coupling), both frequency sources remain close to the nominal value, the resonant Gerken 30 is not activated. With a system-wide frequency reduction, the total magnetic flux of the windings retains the microfixity>>-- the maximum value and the reed switch is not “awakened, 35

In the case of loss of power section with a motor load, the frequency of the voltage generated by them decreases and soon reaches the setpoint (2 · 48 = 96 Hz),

Gurkon enters into resonance, its contact dd is closed by the double frequency of the residual EMF of the engines, the block b converts the pulse signal into a continuous one and enables the action of the automation. At. loss of power With short circuit on the supply line. ur _{Aries on P} r _y ya i On a section may “not be enough to excite _; reed switch at a frequency of 48 Hz. However, by. During the coasting run, the contact vibrator is triggered at a frequency of 46 Hz.

In the above case, the frequency block 50 of the nagerone operates similarly to a frequency relay located in the electric center of oscillations in the asynchronous operation of two power systems.

In the mode of one-sided power 55 of the consumer, the proposed authority may. ? ·. ·· be used as a protection device against power loss in the automatic reclosing cycle.

In the circuit of the windings of the excitation of the reed switch 2 and 4 respectively, the softening block contacts of the switch 7 and the second 8 supply input are entered. When one input is disconnected, the blocking contact of its switch outputs the corresponding excitation winding in operation. in the mode of power loss for the remaining input, the reed switch is triggered upon reaching the specified setpoint for the frequency of the voltage of the running engines. Additional control is made by the body controlling the direction of active power.

The proposed start-up body functions more reliably than when the power supply is unsynchronized under Normal conditions and when the voltage transformer malfunctions. Thanks to the response to the frequency of filling, the block of the difference of frequencies on the resonant reed switch operates at low residual voltage on the quenched section.

With input power sensors, the device can operate in an automatic reclosing cycle, which expands its capabilities. In addition, the device is simpler known structurally and does not require significant costs for implementation.

Claims (2)

Claim 1. Start-up body of emergency control automation for consumers with ". Motor load, containing a frequency difference control unit, the inputs of which are connected to voltage sensors of monitored power sources, in order to improve reliability and expansion functionality, a storage unit "is inserted into it", and the frequency difference control unit is designed as a reed switch with a resonant frequency of the movable plate equal to twice the frequency of the EMF of electric motors, the excitation winding of which is included S are counter and connected to the voltage sensors of monitored sources, while the contact of the reed switch is connected in series with the storage unit. ' 2. The body of claim 1, whether or not a single one. that between the windings of the excitation of the reed switch and voltage sensors of controlled sources, switching elements are introduced. .