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   Multifunction meters

PSCH-4TM.05MD

PURPOSE

Multi-function PSCH-4TM.05MD energy meters are designed for accounting of active and reactive energy (inclusive of losses), maintenance of arrays of load power profile data with the programmable integration time (inclusive of losses), recording of power peaks and determination of three-phase network parameters and energy quality indices.
Energy meters may be used for commercial or technical accounting of energy at industrial plants and in power networks as well as accounting of power flows and interconnection tie flows in power networks.
PSCH-4TM.05MD energy meters are intended to be used both in standalone mode and as part of automated measuring and information systems for electric power fiscal accounting (AMIS EPFA) as well as automated dispatch control systems (ADCS).
Energy meters production range includes:

  • bidirectional energy meters for multi-rate accounting of active and reactive energy of the forward and reverse direction (four accounting channels);
  • unidirectional energy meters for multi-rate accounting of active energy irrespective of the current direction for each network phase (one accounting channel, in modulus);
  • combined energy meters for multi-rate accounting of active energy irrespective of the current direction for each network phase (in modulus) and reactive energy of the forward and reverse direction (three accounting channels).

 bidirectional and combined energy meters may be configured for operation in the unidirectional mode (three accounting channels) to measure:

  • active energy of the forward and reverse direction as active energy of the forward direction (in modulus);
  • reactive energy of the first and third quadrant as reactive energy of the forward direction (inductive load);
  • reactive energy of the fourth and second quadrant as reactive energy of the reverse direction (capacitive load).

Energy meters operation in the unidirectional mode is possible only in one-way lines. Thus, the possibility of accounting distortions in case of incorrect connection of energy meter current circuits is being ruled out.

TECHNICAL FEATURES

  • Two independent communication interfaces RS-485 and optical port.
  • ModBus-equivalent, SET-4TM.02-compatible communication protocol with augmented addressing function.
  • Two configurable insulated test outputs.
  • One configurable digital input.
  • Multi-function backlit liquid crystal display.
  • Generation of the load control signal corresponding to various programmable criteria.
  • Access to parameters and data through communication interfaces is limited by read and program passwords.
  • Built-in real-time clock.
  • Increased strength magnetic field sensor.
  • Capability for single-phase accounting of energy.
  • Three energy-independent electronic seals.
  • Metrological coefficients and factory settings are protected by a hardware jumper and are not accessible without breaking of seals.
  • Housing energy meter design variant for DIN-rail mounting.

FUNCTIONAL CAPABILITIES

Energy pricing and measured energy archives
Energy meters are designed for three-phase and separate for each network phase (single-phase) multi-rate accounting of active and reactive energy of the forward and reverse direction (depending on the design and configuration variant).
Rater:

  • four time of day rates (rates T1-T4 and total value for all rates);
  • four types of rates (working days, Saturday, Sunday and holidays);
  • twelve seasons (for each month of a year);
  • discrete value for the time of day rate comes up to 10 minutes; time of day rates sequence in a day totals up to 144;
  • schedule of holidays and a list of rescheduled days.

PSCH-4TM.05MD energy meters are used for non-rated accounting of energy with due consideration for active and reactive losses in power transmission line and power transformer.
Energy meters maintain archives of rated energy measured (three-phase and single-phase, active and reactive, forward and reverse direction) and non-rated energy with due consideration for losses (three-phase and single-phase, active and reactive, forward and reverse direction) as well as accounts of the number of impulses coming from the external sensors through the digital input:

  • total reckoning from the reset (running total);
  • for the current and previous day;
  • at the beginning of the current and previous day;
  • for each previous calendar day with the data retention time of up to 30 days;
  • at the beginning of each previous calendar day with the data retention time of up to 30 days;
  • for the current and twelve previous months;
  • at the beginning of the current and twelve previous months;
  • for the current and previous year;
  • at the beginning of the current and previous year.

PSCH-4TM.05MD energy meters may be configured for single-rate operation irrespective of the rate card used.

Load power profiles
PSCH-4TM.05MD energy meters maintain two basic 4-channel arrays of power profile data with the data retention time 114 days if the integration time is 30 minutes and 170 days if the integration time is 60 minutes.
Bidirectional energy meters maintain two independent basic four-channel arrays of power profile data with the programmable integration time of 1 to 60 minutes for active and reactive power of the forward and reverse direction.
Combined energy meters maintain two independent basic three-channel arrays of power profile data with the programmable integration time of 1 to 60 minutes for active power irrespective of the direction and reactive power of the forward and reverse direction.
Unidirectional energy meters maintain two one-channel arrays of power profile data with the programmable integration time of 1 to 60 minutes for active power irrespective of the direction.
Each basic array of power profile data may be configured for maintenance of load power profile data with due consideration for active and reactive losses in power transmission line and power transformer with the integration time of 1 to 30 minutes.

Parameters profiles
PSCH-4TM.05MD energy meters maintain an independent array of parameters profile (hereinafter - extended or 3rd array of profile data) with the programmable integration time of 1 to 60 minutes.

  • number of (any) profiled parameters - up to 16;
  • retention time for (any ) four parameters comes up to 248 days if the integration time is 30 minutes and 341 days if the integration time is 60 minutes.

Extended parameters profile array may be configured with regard to selection of number and type of profiled parameters along with the data retention format.

Recording of load power peaks
PSCH-4TM.05MD energy meters may be used as recorders of power (active, reactive, forward and reverse direction) peaks for each basic array of power profile data. In this case a schedule of twelve seasons of morning and evening peaks is applied.
Power peaks are recorded in energy meter archives:

  • reckoning from the reset (manual reset or reset on an interface command):
  • for the current and twelve previous months.

Measurement and accounting for losses
Energy meters calculate active and reactive power losses in power transmission line and power transformer on the basis of measured current values and entered values of rated power losses.

Determination of network parameters and energy quality indices
PSCH-4TM.05MD energy meters determine instantaneous values (integration time of 0.2 to 5 s) of physical parameters typical for the three-phase network and may be used as network parameters measuring units or sensors.
Energy meters of all design variants irrespective of their configuration function as four-quadrant measuring units with due account for direction and angle between current and voltage phases and each network phase and may be used for assessment of correctness of meters connection.

PSCH-4TM.05MD energy meters may be used for measuring of energy quality indices judging by parameters of steady-state deviations (line-to-line, positive-sequence) of voltage and network frequency.

Test outputs and digital inputs
Energy meters have two insulated test outputs of the main transmission unit. Each test output may be configured for generation of:

  • remote metering impulses of one of the energy accounting channels (active, reactive, forward and reverse direction, inclusive of losses);
  • signal indicating crossing of the programmable power (active, reactive, forward and reverse direction) limit;
  • remote control signal;
  • clock accuracy control signal (only for the channel 0 output);
  • generation of the load control signal corresponding to various programmable criteria (only for the channel 0 output).

PSCH-4TM.05MD energy meters has an insulated digital input, which may be configured:

  • for calibration mode control;
  • for calculation of the running total of impulses coming from external devices (leading, trailing or both edges);
  • as a remote signal system input.

Load control
PSCH-4TM.05MD energy meters allow for generation of the load control signal at the configurable test output (channel 0) according to various programmable criteria for the load control of the external power shutdown device.
Energy meters with the load control function may operate in the following modes:

  • mode of load power limiting;
  • mode of energy limiting for a certain day;
  • mode of energy limiting for the accounting period (for a month, if the accounting period begins on the first of the month);
  • mode of network voltage control;
  • mode of energy meter temperature control;
  • mode of scheduled load control.

The specified modes may be allowed or prohibited depending on any specific combination.
Irrespective of modes set the load control signal is generated on an interface command of the operator.

Counter Logs
Energy meters maintain event logs, energy quality indices logs, power limit crossing log and status data log.

Display unit
PSCH-4TM.05MD energy meters are equipped with a backlit liquid crystal display for representation of energy measured (only for a three-phase network) and measurable parameters as well as three buttons for display modes control.

Energy meter display may operate in one of the following modes:

  • current readings display mode;
  • basic parameters display mode;
  • accessory parameters display mode;
  • technological parameters display mode.

Communication interfaces
PSCH-4TM.05MD energy meters have two independent equal priority galvanically separated communication interfaces RS-485 and optical port.
Energy meters communication interfaces allow to control:

  • time setting, correction and synchronization;
  • display modes;
  • load on the operator command;
  • reset of readings (dump of measured energy registers);
  • reset of power peaks;
  • initialization of arrays of power profile data;
  • search of profile array heading address;
  • recording of additional measuring modes data;
  • energy meter reset;
  • energy meter initialization.

Electronic seals and magnetic field sensor
Energy meters are equipped with three energy-independent electronic seals:

  • for the energy meter housing cover;
  • for the terminal box protective cover;
  • for the interface circuits and battery protective cover.

Electronic seals allow to determine opening / resealing time for the respective cover and generate an entry in the event log. Electronic seals may operate both when the energy meter power is on and off.
Energy meters are equipped with a magnetic field sensor intended to detect the effect of a magnetic field with the increased strength of 2 0.7 mT (density 1600 600 A/m) and above.

SPECIFICATIONS

Parameter name

Value

Accuracy rating for measurement (in the forward and reverse direction) of
   active energy
   reactive energy

 

0,5 S or 1
1 or 2

Rated (maximum) current, A
Base (maximum current), A

1 (2) or 5 (10)
5 (80)

Starting current (sensitivity), mA
   for transformer-connected energy meters
   for direct-connect energy meters

 

0.001 Irated
0.004 Ib

Rated voltage, V

3 x (57.7 - 115) / (100 - 200) or
3 x (120 - 230) / (208 - 400)

Preset operating voltage range, V, for energy meters with:
   Urated = 3 x (57.7 - 115) / (100 - 200) V
   Urated = 3 x (120 - 230) / (208 - 400) V

0.8 Urated to 1.15 Urated
3 x (46 - 132) / (80 - 230);
3 x (96 - 265) / (166 - 460)

Maximum operating voltage range (for any two phases), V

0 to 440

Rated network frequency, Hz

50

Operating frequency range, Hz

47.5 to 52.5

limits of acceptable mean relative measurement error, %:
active power (of the forward and reverse direction at active, inductive and capacitive loads), δP

 

      1) for transformer-connected energy meters

0.5 at 0.05 Irated ≤ I ≤ Imax, cos φ = 1;
0.6 at 0.05 Irated ≤ I ≤ Imax, cos φ = 0.5;
1.0 at 0.01 Irated ≤ I < 0.05 Irated, cos φ = 1;
1.0 at 0.02 Irated ≤ I < 0.05 Irated, cos φ = 0.5;
1.0 at 0.05 Irated ≤ I ≤ Imax, cos φ = 0.25;

      2) for direct-connect energy meters

1.0 at 0.1 Ib ≤ I ≤ Imax, cos φ = 1, cos φ = 0.5;
1.5 at 0.05 Ib ≤ I < 0.1 Ib, cos φ = 1
1.5 at 0.1 Ib ≤ I ≤ Imax, cos φ = 0.25

   reactive power (of the forward and reverse direction at active, inductive and capacitive loads), δQ

 

      1) for transformer-connected energy meters

1.0 at 0.05 Irated ≤ I ≤ Imax, sin φ = 1, sin φ = 0.5;
1.5 at 0.01 Irated ≤ I < 0.05 Irated, sin φ = 1;
1.5 at 0.02 Irated ≤ I < 0.05 Irated, sin φ = 0.5;
1.5 at 0.05 Irated ≤ I ≤ Imax, sin φ = 0.25;

      2) for direct-connect energy meters

2.0 at 0.1 Ib ≤ I ≤ Imax, sin φ = 1, sin φ = 0.5;
2.5 at 0.05 Ib ≤ I < 0.1 Ib, cos φ = 1;
2.5 at 0.1 Ib ≤ I ≤ Imax, sin φ = 0.25;

   full power, δS

δs = δQ (similar to reactive power)

   voltage (line-to-ground, line-to-line, positive-sequence and their averaged values), δU

0.4 within the range of 0.8 Urated to 1.15 Urated
0.9 (for direct-connect energy meters)

   current, δI:
      1) for transformer-connected energy meters

0.4 at Irated ≤ I ≤ Imax;
[0.4 + 0.02 (Irated / Ix - 1)]
at 0.01 Irated ≤ I ≤ Irated

      2) for direct-connect energy meters

0.9 at Ib ≤ I ≤ Imax;
[0.9 + 0.05 (Ib / Ix - 1)]
at 0.05 Ib ≤ I < Ib

   frequency and its averaged value

0.05 within the range of 47.5 to 52.5 Hz

Built-in clock accuracy under normal conditions when switched on or off, higher than, s/day

0.5

Full power consumption by each series circuit, VA, max

0.1

Active (full) power consumption by each parallel voltage circuit, in the voltage range of 57 V to 115 V and of 120 V to 230 V, W (VA), max

57.7 V

115 V

120 V

230 V

0.3 (0.4)

0.4 (0.6)

0.4 (0.6)

0.5 (1.1)

Characteristics of communication interfaces:
   optical port bit-rate;
   RS-485 interface bit-rate;


9600 bit/s (constant);
38400, 28800, 19200, 9600, 4800, 2400, 1200, 600, 300

Energy meter constant in basic (A) and calibration modes (A), imp/(kWh), imp/(kVArh) for energy meters with:

 

   3 x (57.7 - 115) / (100 - 200) V, 1 (2) A

A = 25000, B = 800000

   3 x (57.7 - 115) / (100 - 200) V, 5 (10) A

A = 5000, B = 160000

   3 x (120 - 230) / (208 - 400) V, 1 (2) A

A = 6250, B = 200000

   3 x (120 - 230) / (208 - 400) V, 5 (10) A

A = 1250, B = 40000

   3 x (120 - 230) / (208 - 400) V, 5 (80) A

A = 250, B = 8000

Number of displayed digits for the liquid crystal display

8

Data retention time in case of power supply interruption, years:
   information, more than
   internal clock, min.


40
12 (lithium-type battery supply)

Data protection

three access levels passwords and hardware protection of memory allocated for metrological coefficients

Self-diagnostics

cyclic, constant

Operating conditions:
   ambient air temperature, C
   relative humidity at 30C, %
   pressure, kPa (mm Hg)


group 4 according to GOST 22261-94
-40 to +60
up to 90
70 to 106.7 (537 to 800)

Mean time between failures, hours

165000

Mean lifetime, years

30

Weight, kg:
   for transformer-connected energy meters
   for direct-connect energy meters


0.8
1.1

Dimensions, mm

171 x 113 x 66.5

DESIGN VARIANTS

Designation for energy meter design variant

Rated, base (maximum) current, A

Rated voltage, V

Accuracy class of active / reactive energy accounting

Energy accounting

Transformer-connected energy meters

PSCH-4TM.05MD.01

5 (10)

3 x (57.7 - 115) / (100 - 200)

0.5S/1

Bidirectional (four accounting channels) for accounting of active and reactive energy of the forward and reverse direction;

PSCH-4TM.05MD.03

1 (2)

PSCH-4TM.05MD.05

5 (10)

3 x (120 - 230) / (208 - 400)

PSCH-4TM.05MD.07

1 (2)

PSCH-4TM.05MD.09

5 (10)

3 x (57.7 - 115) / (100 - 200)

0.5S/1

Unidirectional (one accounting channel, in modulus) for accounting of active energy irrespective of direction;

PSCH-4TM.05MD.11

5 (10)

PSCH-4TM.05MD.13

5 (10)

3 x (120 - 230) / (208 - 400)

0.5S/1

Combined (three accounting channels) for accounting of active energy irrespective of direction and reactive energy of the forward and reverse direction

PSCH-4TM.05MD.15

1 (2)

PSCH-4TM.05MD.17

5 (10)

3 x (57.7 - 115) / (100 - 200)

PSCH-4TM.05MD.19

1 (2)

Direct-connect energy meters

PSCH-4TM.05MD.21

5 (80)

3 x (120 - 230) / (208 - 400)

1/2

Bidirectional

PSCH-4TM.05MD.23

5 (80)

Unidirectional

PSCH-4TM.05MD.25

5 (80)

Combined

 

 

New products

Time-schedule of workshops

Copyright

Copyright © 2012
Nizhny Novgorod Factory named after M.V. Frunze.
All rights reserved.
 
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