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Voltage monitoring devices and voltage protection kit
Voltage regulating devices for under load transformer
It is used as protection, automatics, control and monitoring of technological processes of asynchronous and synchronous electric motors 6/10 kV, having current transformers both on the supply side and the neutral side.
It performs the following functions:
Provides control and measurement of the following values:
- phase currents of frequency 50 Hz with a nominal value
- Iн = 5А in the range from 0,1 to 30 Iн of the outputs side;
- phase currents with a frequency of 50 Hz with a nominal
- value Iн = 5А in the range from 0,1 to 30 Iн of the neutral side;
- three linear (phase) voltages with a rated voltage of 100V;
- three phase shifts of the angles between currents and voltages;
- zero sequence current - from 0.01 to 2A;
- negative sequence current;
- current in the supply circuits of an excitation transformer (ET) with a rated secondary current of 5A;
- frequency of current in the network.
Relay protection functions:
- Motor differencial protection two-stage in three-phase performance: the first stage - differential cut-off, the second stage - sensitive with braking;
- overcurrent protection (OCP) three-stage in three-phase performance: the first and third stages - with an indefinite time delay, the second - with a definite time delay (to implement protection against symmetrical overload), uses currents on the output side, there is the possibility of accelerating the second stage;
- protection against unbalanced conditions by 12;
- ground fault protection for 3Io current, operates with or without a delay for cut-off or signal, not directional: the protection reacts to the residual current of the industrial frequency 3Io (analogue of the relay PTZ-51);
- disconnection at start-up on the braked mechanism, implemented by the logic of OCP with a single time delay, it is possible to accelerate the action time through a discrete input;
- tripping with disconnection from the device or in case of damage to the mechanism (rupture of the conveyor belt, etc.), realized by current shedding in at least one phase;
- protection against asynchronous operation (from excitation loss), is realized by the combination of a stable disappearance of the current of a CT with the presence of a significant stator current (in one phase) or from a discrete signal from the contact of the field blanking device entering the discrete input;
- individual undervoltage protection, is realized on the fact of reduction of one line voltage up to level Umin;
- circuit-breaker failure protection (CBFP). CBFP is initiated from the selected OCP stages, Motor differencial protection, earth fault protection or external devices (via a binary input). CBFP has two stages in response time, is performed with current monitoring.
- circuit breaker can be switched on and off both from the device and via a discrete input (pulsed). If there is a command to cut off the circuit breaker, the on signal is blocked.
- defined functions - number of defined functions - 16.
Discrete signal recorder:
- 100 recent events;
- up to 50 entries in each accident;
- fixation of maximum currents.
Analog signal recorder:
- 11 recent events;
- duration of the pre-fault process - up to 5 s,
- duration of the post-accident process - up to 20 s.
Number of freely programmable inputs, outputs, indicators:
- discrete inputs - 16;
- discrete relay outputs - 15;
- LED indicators - 14.
- numeric keypad;
- four freely programmable buttons;
- graphic indicator (in character mode - 8 lines);
- possibility to set all the default settings;
- input-output of all protections is provided;
- work with an external computer is carried out through the USB port;
- RS-485 interface is provided for network creation.
Overall and connecting dimensions and recommended marking
Simplified connection diagram