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Electrical Machine Protection and Control Device
SEZAM-М


SEZAM-М - Electrical Machine Protection and Control Device
SEZAM-М

The device of protection and monitoring of the electrical machines SEZAM-M is intended for use in schemes of technological and relay protection of asynchronous electrical machines of alternating current of 6-10 kV and with power up to 5 MW.

The devices of the SEZAM series are based on the most modern principles. The logic of functioning of the device is formed on the basis of library of the standard ANSI functions with use of modern open languages of high level. The modular principle of creation of a configuration allows to optimize it according to the required task that gives the chance to reach the best indicators "price/functionality".

The devices of the SEZAM series possess all standard functions of microprocessor protection, namely: functions of protection, measurement, automatic equipment, diagnostics of network and the switching device, self-diagnostics, a digital oscillography and communication under the open MODBUS protocol. At the same time it is necessary to emphasize that the device, conforming to all necessary requirements to perspective development of system, has no excess functions that allows to provide an optimum ratio of the price and quality.

Configuration

The devices of the SEZAM series possess all standard functions of microprocessor protection, namely: functions of protection, measurement, automatic equipment, diagnostics of network and the switching device, self-diagnostics, a digital oscillography and communication under the open MODBUS protocol. At the same time it is necessary to emphasize that the device, conforming to all necessary requirements to perspective development of system, has no excess functions that allows to provide an optimum ratio of the price and quality.

SEZAM-М - Electrical Machine Protection and Control Device_back

The basic module is installed directly in the control cases, and the portable remote control is connected with the main unit by means of the interface cable.

The basic module stores and carries out the program of work. The remote control stores the menu of the user, performs functions of display of the current parameters and editing settings.

SEZAM-М - remote control

The remote control (RC) is installed in the user-friendliest place (for example, on the front panel of a case, on a control board), and RC provides for the user the interface of input, output and indication by means of the keyboard, light-emitting diodes and liquid crystal indicators.
The remote control contains the RS485 interface for connection to the basic module and the USB interface for connection to the personal computer.

In the enclosed table the examples of modifications of SEZAM devices (for various connections with rigid logical schemes) which meet the maximum requirements of consumers are given. The specified functions of relay protection are registered in the processor at manufacturer by means of the special program.

A set of the unified hardware decisions and big library of standard functions of protection and automatic equipment of SEZAM series devices allow to create quickly the unit conforming to your requirements. If you need the device with unique logical functions, we are ready to realize your desire without increase in delivery time.

Modifications table of protection devices of the SEZAM-M series


Function
code
according to
ANSI
Name of parameter Protection and automatic equipment
of the asynchronous engine
SEZAМ‑М
- 01.01
SEZAМ‑М
- 07.01
SEZAМ‑МД
- 13.01
Protection functions
  Current Cutoff (CC) + Maximum Current Protection (MCP): 4 grades 4 grades 4 grades
50 MCP cutoff + + +
51 MCP independent/dependent
(5 time-current characteristics)
3/1 3/1 3/1
50V, 51V voltage blocking 4 4 4
67 directional 2 grades 2 grades 2 grades
50HS MCP acceleration 4 4 4
50N
51N
Protection against earth current (EC) - (3 Io): 2 grades 2 grades 2 grades
EC cutoff + + +
EC independent /dependent
(5 time-current characteristics)
2/2 2/2 2/2
on the highest harmonicas 2 2 2
67N Protection against earth current at (3 Io) and (3 Uo), directional 2 2 2
27 Protection of minimum line voltage 4 grades 4 grades 4 grades
27S Protection of minimum phase voltage 4 grades 4 grades 4 grades
27D Protection of minimum voltage of direct sequence 2 grades 2 grades 2 grades
59 Protection of maximum line/phase voltage 4 grades 4 grades 4 grades
59N Protection of maximum voltage of zero sequence 2 grades 2 grades 2 grades
46 Maximum current protection of reversed sequence (protection against power supply assymetry) 2 grades 2 grades 2 grades
47 Protection of maximum voltage of reversed sequence 2 grades 2 grades 2 grades
46PD Suitability checking (symmetry) current circuits + + +
37 Minimum current protection + + +
  External protection on discrete inputs (DI) with a possibility of current checking 5 DI 5 DI 5 DI
48 Protection against motor start-up with time delay + + +
51LR Protection against blocking of a motor rotor + + +
38/49T Protection against overheating with measurement of temperature by external sensors + + +
68 Logical selectivity + + +
87T Differential current cutoff - - +
  Differential current protection with deceleration - - +
87М Differential protection of motor - - +
78PS Protection against return power - - +
Automation function
79 Automatic repeated switching on, quantity of cycles - - -
50BF Device of reservation of the switch failure 1 grade 1 grade 1 grade
  Automatic switching on of reserve - - -
  Automatic frequency deloading - - +
  Automatic repeated switching on at frequency - - -
66 Restriction of quantity of start ups + + +
  Ban of launch of the superheated motor - - +
Functions of control and checking
  Remote (local) “OFF” and “ON” of switch by means of external commands +(-) +(-) +(-)
  Operative input-output of functions of protection and automatic equipment by means of external signals + + +
69 Blocking of switching on + + +
30 Signalling + + +
86 Acknowledgement (clearance) + + +
74 Checking of circuit of switching off + + +
  Checking of resource of switch + + +
Service functions
  Measurement of current 4 4 8
  Measurement of voltage 4 4 4
  Measurement of frequency + + +
  Fixing of current of switching off at the accident time + + +
  Fixing of voltage at the accident time + + +
  Registration of 250 events with non-volatile memory + + +
  Oscillography with non-volatile memory + + +
  Integration into an automatic control system (ACS) + + +
  Control of set of settings using discrete input of ACS 2 2 2
Analog input circuit
  Quantity of current inputs 4 4 8
  Quantity of voltage inputs 4 4 4
  Quantity of temperature sensors * ? 4 4
Discrete input circuit
  Quantity of discrete inputs 8 16 12
  Quantity of outputs (relay) 6 8 11
* - quantity of temperature sensors has to be specified at the order