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PQM Diagnostics
sanhe
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Provider: Sanhe Power Tech (Shenzhen) Co., Ltd.
Applicable to: Renewable energy plants, industrial & commercial parks, industrial users, data centers, energy storage systems, overseas projects
1. Service Overview
This service identifies the root causes of harmonic distortion, voltage deviation, three-phase imbalance, voltage fluctuation, and voltage sags through on-site measurement, data acquisition, and professional analysis, while also assessing energy consumption structure and efficiency. It provides traceable and verifiable data for equipment selection, mitigation scheme design, grid connection acceptance, troubleshooting, and energy efficiency optimization.
With over 20 years of experience in power electronics and power quality, and leveraging its in-house mitigation equipment (SVG, APF, DVR) and energy management capabilities, Sanhe Power offers a one-stop service from testing and diagnosis to consulting and mitigation/energy efficiency implementation for both domestic and international customers.
Customer Issue | Possible Cause | What Diagnostics Confirms |
High electricity bills, power factor below standard | Insufficient reactive compensation, harmonic pollution | Power factor level, reactive power demand, harmonic share |
Equipment frequently tripping or shutting down | Voltage sags, harmonic resonance, three-phase imbalance | Event waveforms, disturbance source location, sensitivity of critical equipment |
Renewable grid connection requires rectification | Harmonics, voltage deviation, flicker exceeding limits | Whether power quality at the point of connection meets standards |
Abnormal heating of capacitors or transformers | Harmonic amplification, parallel resonance | Harmonic flow analysis, resonance risk assessment |
Precision equipment malfunction, rising defect rate | Voltage fluctuation, interharmonics, voltage sags | Power quality statistics and event records |
Energy costs high but unclear where to optimize | Unclear energy flow, low equipment efficiency, no sub-metering | Energy consumption structure, efficiency baseline, energy-saving potential |
Carbon data cannot be verified | Unclear energy flow, blurred metering boundaries | Energy and carbon accounting boundary clarification |
Overseas projects need to comply with local grid codes | Different standards, harmonic/flicker limits | Assessment against IEEE 519, IEC 61000, EN 50160 |
Comprehensive testing covers the following parameters, based on national and international standards:
Test Item | Reference Standard | Core Value |
Supply voltage deviation | GB/T 12325-2008 / EN 50160 | Assess voltage deviation from rated value |
Power system frequency deviation | GB/T 15945-2008 | Assess frequency stability |
Harmonics (2nd–50th order) | GB/T 14549-1993 / IEC 61000-4-30 Class A / IEEE 519 | Identify harmonic sources and risks to transformers/capacitors |
Three-phase voltage/current imbalance | GB/T 15543-2008 / IEC 61000-4-30 | Assess negative-sequence impact on motors and precision equipment |
Voltage fluctuation and flicker | GB/T 12326-2008 / IEC 61000-4-15 | Assess interference with sensitive loads |
Voltage sags/swells/short interruptions | IEC 61000-4-30 / GB/T 30137 | Record event waveforms and locate the source of voltage dips |
Interharmonics (0.5th–49.5th order) | GB/T 24337-2009 | Assess low-frequency interharmonic impact |
Power and power factor | — | Assess reactive power demand and energy efficiency |
Measurement method: Power quality analyzers compliant with IEC 61000-4-30 Class A are used, with a basic measurement interval of 10 cycles, ensuring data accuracy and comparability. For overseas projects, assessment can be based on IEEE 519, EN 50160, and other international standards.
Consulting Item | Content | Deliverable |
Power quality status assessment | Assess power quality risks of existing or planned systems based on single-line diagrams, load lists, and operating data | Power Quality Assessment Report |
Harmonic flow and resonance analysis | Build system impedance models, analyze harmonic amplification and parallel resonance risks | Harmonic Analysis Calculation Report |
Mitigation scheme design and selection consulting | Provide SVG/APF/DVR capacity calculation, installation location recommendations, and scheme comparison | Mitigation Scheme Recommendation |
Grid compliance consulting | Assess grid connection compliance against GB/T, IEEE 519, EN 50160, etc. | Compliance Assessment Opinion |
Power quality training | Training for electrical O&M teams on fundamentals, standards, and equipment maintenance | Training materials and records |
Third-party technical review | Independent review of mitigation schemes proposed by customers or third parties | Review Opinion |
Beyond power quality, the service assesses energy consumption structure and efficiency, identifying energy-saving opportunities and supporting energy/carbon management:
Service Item | Content | Deliverable |
Energy consumption structure analysis | Collect and analyze electricity, gas, water, heat, and other energy data to clarify energy flow and consumption distribution | Energy Consumption Analysis Report |
Energy efficiency baseline assessment | Establish energy efficiency baselines for main equipment and systems (motors, chillers, air compressors, pumps, etc.) | Energy Efficiency Baseline Report |
Energy-saving potential analysis | Identify energy waste points and quantify energy-saving potential (load shifting, equipment upgrades, operational optimization, etc.) | Energy-Saving Potential Analysis |
Energy management system (EMS) consulting | Assess the need for an energy management platform and provide functional requirements and deployment recommendations | EMS Requirements Recommendation |
Carbon accounting support | Support energy-related carbon accounting boundary definition and data organization (Scope 1 & 2) | Carbon Accounting Data Support |
Energy efficiency optimization recommendations | Provide actionable energy efficiency improvement measures with preliminary investment and payback estimates | Energy Efficiency Optimization Proposal |
Support Area | Details |
Standard adaptation | Testing and assessment can be based on IEEE 519, IEC 61000 series, EN 50160, and other international standards |
Overseas on-site service | On-site power quality testing and energy efficiency assessment in Southeast Asia (Thailand, etc.), the Middle East, Europe, and other regions |
Diagnosis-to-mitigation linkage | Test conclusions directly support the selection and configuration of in-house SVG/APF/DVR solutions, enabling integrated "diagnosis–mitigation" delivery |
Project support | Can work with overseas EPC contractors or owners to perform testing and diagnosis per international standards |
Stage | Content | Deliverable |
1. Requirement discussion | Clarify diagnostic objectives, measurement points, evaluation standards, and monitoring period | Diagnostic Plan Confirmation |
2. Site survey | Confirm wiring conditions, safety measures, and CT/switchgear status | Site Survey Record |
3. Instrument installation | Install power quality analyzers and energy meters at agreed points | Installation Record |
4. Continuous monitoring | Collect power quality and energy consumption data over the set period | Raw Data Files |
5. Data analysis | Perform statistics per standards and analyze energy efficiency | Data Analysis Table |
6. Report issuance | Compile diagnostic and energy efficiency report with recommendations | Power Quality & Energy Efficiency Diagnostic Report |
6. Deliverables
Core Content of the Diagnostic Report
Diagnostic overview: measurement points, voltage levels, monitoring period, instrument models, calibration information
Power quality statistics: 95% probability values, maximum, minimum, compliance rates for each parameter
Exceedance analysis: item-by-item comparison against standard limits
Event records: waveforms, duration, residual voltage of voltage sag/swell events
Root cause identification: preliminary identification of disturbance sources
Mitigation recommendations: equipment selection direction (SVG/APF/DVR) and capacity estimation
Compliance opinion: compliance assessment against grid connection standards
Energy consumption analysis: energy structure, efficiency baseline, energy-saving potential
Energy efficiency recommendations: actionable measures with preliminary investment and payback estimates
Carbon accounting support: boundary definition and data organization for Scope 1 & 2
Tier | Name | Content | Application |
L1 | Digital preliminary diagnosis (remote/desktop) | Rapid assessment based on bills, single-line diagrams, and load lists; preliminary opinion within 3–5 working days | Early project stage, limited budget |
L2 | On-site power quality testing | Continuous monitoring per IEC 61000-4-30 Class A | Grid connection acceptance, troubleshooting |
L3 | Comprehensive diagnosis + energy efficiency | Testing + consulting + mitigation/energy efficiency recommendations | Mitigation project initiation, energy efficiency optimization |
Dimension | Description |
Standard compliance | Measurement methods comply with IEC 61000-4-30 Class A; statistics align with national standards; assessment can be based on international standards |
Diagnostic independence | Conclusions are not tied to equipment sales; customers may choose their own mitigation scheme or supplier |
In-house equipment | Own SVG/APF/DVR product lines; diagnostic conclusions directly support mitigation scheme design and equipment selection |
Energy efficiency integration | Combines power quality diagnosis with energy consumption analysis, avoiding fragmented assessments |
Engineering experience | Has served Sinopec, CNPC, CNOOC, PipeChina, and other major enterprises |
Global delivery | Overseas project experience in the UK, Saudi Arabia, Malaysia, Cambodia, etc. |
Before project commencement, Sanhe Power can sign a Non-Disclosure Agreement (NDA) with the customer, specifying confidentiality obligations for distribution system, load characteristics, operating data, and other information obtained during diagnostics. Without the customer's written permission, such data will not be used for purposes other than this project or disclosed to third parties.
Model | Application | Description |
Single diagnostic service | Grid connection acceptance, troubleshooting, dispute evidence | Priced by measurement points and monitoring period |
Single consulting/energy efficiency assessment | Scheme review, harmonic analysis, energy efficiency potential analysis | Priced by project scope |
Diagnosis + consulting + energy efficiency package | Diagnose, assess, then optimize | Fees can be packaged |
Annual framework service | Regular power quality and energy efficiency inspections | Signed annually, covering multiple assessments and priority response |
Diagnosis + mitigation/energy efficiency integration | Mitigation or energy efficiency improvements required after diagnosis | Diagnostic or consulting fees partially deductible from subsequent equipment purchases |
Overseas project support | Overseas renewable energy/industrial projects | Can work with EPC contractors or owners per international standards |
Information Item | Description |
Single-line diagram / distribution system diagram | Determine measurement points and system topology |
Voltage level and transformer capacity | Assess short-circuit capacity and background harmonics |
Main load types | Non-linear loads such as VFDs, rectifiers, arc furnaces, EV chargers |
Energy consumption data | Electricity, gas, water, heat bills and sub-metering data (if available) |
Diagnostic purpose | Grid connection acceptance / troubleshooting / mitigation / energy efficiency / carbon accounting |
Monitoring period or consulting scope | 24 hours / 7 days / as required; single item or overall assessment |
Q1: Does diagnostics require a power outage?
A: Routine on-site testing uses clamp-on or split-core CTs, requiring no power outage.
Q2: How long does monitoring take?
A: Routine monitoring is 24 hours to 7 days, depending on the diagnostic purpose.
Q3: Can the report be used for grid connection applications?
A: Yes. It is compiled per GB/T 14549, GB/T 12325, and other standards, with measurement methods compliant with IEC 61000-4-30 Class A. For overseas projects, reports can be issued against IEEE 519, EN 50160, etc.
Q4: Must mitigation equipment be purchased after issues are identified?
A: Not necessarily. The report provides technical judgment and recommendations; customers may choose their own mitigation scheme or supplier. Diagnostic services remain independent and objective.
Q5: What information is needed for remote preliminary diagnosis?
A: Bills, single-line diagram, load list, transformer capacity, and operating condition description. Preliminary opinion within 3–5 working days.
Q6: Can on-site diagnostics be provided for overseas projects?
A: Yes. Specific arrangements depend on project location and schedule.
Q7: How is customer data kept confidential?
A: A Non-Disclosure Agreement (NDA) can be signed before project commencement. Without written permission, data will not be used for other purposes or disclosed to third parties.
Q8: Can energy efficiency management be combined with power quality diagnosis?
A: Yes. The service can combine power quality testing with energy consumption analysis to identify both power quality risks and energy-saving opportunities, avoiding fragmented assessments.
Sanhe Power Tech (Shenzhen) Co., Ltd.
yvonne.zhang@samwha-cn.com
www.sanhenergy.com
From diagnosis and consulting to mitigation and energy efficiency implementation — verifiable data and technical support for your power quality and energy performance.
