Distribution and Utilities Monitoring System H-NET

Aiming for optimal equipment operation

Capable of centralized management of daily data such as equipment operating conditions and air and water consumption, in addition to electricity monitoring.
Offers continuous automatic monitoring of energy usage, which until now had to be checked visually.
It visualizes data not only for individual equipment units but also for entire factories and buildings to support various people, including the management, equipment managers, and on-site personnel.

Cleaning and regular inspection of the air shower

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  Transformer and equipment monitoring unit DE-TREQ

  • Monitor demand, electricity, leakage current, and pulse/analog inputs with a single unit
  • Equipped with a touch panel that can also monitor transformer load factor and loss amount

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  Meter type power monitoring unit(Japanese Only)

  • Digital multimeter that can be used as an electricity meter for high-voltage feeders and transformers
  • Compatible with 3-phase 3-wire, single-phase 3-wire, single-phase 2-wire, and 3-phase 4-wire* systems

  • Dedicated product for 3-phase 4-wire systems.

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  Panel-mounted power monitoring unit(Japanese Only)

  • Panel-mounted unit that can be used as an electricity meter for high-voltage feeders and transformers
  • Compatible with 3-phase 3-wire, single-phase 3-wire, and single-phase 2-wire systems

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  Electrical energy calculation unit(Japanese Only)

  • Electrical energy calculation unit for other circuits
  • Ideal for monitoring individual circuits for each MCCB (4-circuit and 8-circuit products)

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  Pulse input unit(Japanese Only)

  • Capable of pulse signal input and no-voltage contact input
  • Ideal for monitoring demand at the connection point and checking the operational status of equipment

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  Analog input unit(Japanese Only)

  • Acquires and manages various types of data such as flow rate and temperature with current (DC4-20 mA), voltage (DC1-5 V), and resistance input (Pt100)
  • Upper and lower limits can be set for acquired data by connecting to the host software

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  Logger touch panel DE-HSLTP

  • Easy system construction without the need for a PC

Software

• Easy-to-configure packaged software
• Capable of monitoring from other PCs with the standard software alone
• Electricity, insulation, and utility data can be centrally managed on a single PC

• DE-SWX

Electricity monitoring

• Equipped with Modbus/RTU protocol for rich connectivity with other systems
• Model with a touch panel available.High visibility and easy operation for monitoring

Low-voltage insulation monitoring

• Preventive maintenance by monitoring leakage currents that can lead to fires and other accidents
• Uses the fundamental component method (Ior method), which features stable operation and space saving

• Low-voltage insulation monitoring system i-moni

Utilities monitoring

• Centralized management of utility equipment along with electricity and insulation monitoring
• Records and outputs warning for abnormalities with status monitoring and upper/lower limit monitoring

Demand monitoring for optimal electricity operation

Electricity charges = Basic charge + Electrical energy consumption charge

In order to reduce the basic charge, it is necessary to constantly monitor demand and control the maximum demand power.
Forecasts are made by demand monitoring and warning is output to notify when the target demand is exceeded.

Electricity usage not reviewed and energy saving measures not taken

Electricity usage reviewed and energy saving measures taken

Contracted capacity can be reduced by reviewing electricity usage

Example: February is the month with the highest electrical energy consumption (demand), which determines the contracted capacity for the year from February to January of the following year

Constant monitoring of leakage current to identify signs of deterioration. Danger can be detected in advance!

Insulation resistance measurement once a year is insufficient to detect the signs and eliminate risks of sudden interruption of electricity

By introducing Hitachi’s insulation monitoring, leakage current can be constantly monitored. Monitoring the leakage current not only detects danger but also helps in the maintenance planning of equipment. In addition, connecting the unit to the system allows the measurement data to be saved, which can be used to readily compare the measured values with the past values and with other equipment.

Case 1: Heater leakage current data

A gradually increasing trend of the leakage current value was found. This allowed a heater replacement plan to be made in advance, which prevented equipment shutdown.

Case 2: Leakage current data at startup of submersible pump

Leakage current was found to increase as the submersible pump started up. After power off, it was found out that the measured insulation resistance of the pump was 0.01 MΩ. It provided the basis for a decision on replacement with a new one.

Capability of data measurement from the connection point to the individual MCCB

At a loss as to what to do about carbon neutrality initiatives

A wide range of data can be acquired, from high-voltage electricity such as at the connection point to low-voltage electricity on the load side.
In addition, individual monitoring of each circuit breaker is possible, which allows energy saving points to be found and operation methods to be reviewed by subdividing the data to be visualized.

Transformers integrated and replaced with energy saving transformers

▼Analysis results

Transformers with unnecessarily large capacity found based on actual usage

▼Energy saving measures

Consolidation of transformers from 48 units to 33 units + replacement with more energy-efficient models

Power loss due to transformers reduced from 61.1 MWh/month to

19.2 MWh/month

Replacement with high-efficiency amorphous transformers to achieve further energy saving effect

(From the results at our Nakajo Works)

Elimination of electricity usage in unnecessary hours

▼Analysis results

Manual warm-up before start of production, no stopping for lunch break

▼Energy saving measures

Use of timers to shorten warm-up time and reduce the number of running heaters during lunch breaks

• Calculated based on the condition of 20 operating days in a month, 30 yen/kWh

Energy saving points discovered by detailed hourly measurements

(From the results at our Nakajo Works)

Acquisition of load equipment data for centralized equipment monitoring

For customers who want to centrally monitor data with a single system including data other than electricity

H-NET can acquire any integrated value data that can be acquired by pulse (no-voltage contact)!
It can also acquire instantaneous value data of DC 4-20 mA, DC 1-5 V, and resistance thermometer (Pt100), making it effective for monitoring pressure, water volume, and temperature.
Thresholds can be individually set for them to output warning.

From peak cutting to peak shifting

H-NET provides total management, from demand monitoring at the connection point to trend management for each equipment unit.

Points for improvement

Demand monitoring of electricity usage

Trend management of electricity usage

Adjustment of equipment operating hours

Demand overrun predicted and prevented by shutting down air conditioning

Equipment start-up time shifted to reduce maximum electricity

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